From 6e31b0dbc2513f947d3cfca29c5737a1185af6db Mon Sep 17 00:00:00 2001 From: Benjamin Mako Hill Date: Fri, 1 May 2015 11:22:51 -0700 Subject: [PATCH] import oauthlib (a dependency of the project) --- docs/oauthlib-LICENSE.txt | 21 + docs/oauthlib-PKG-INFO | 10 + oauthlib/__init__.py | 25 + oauthlib/common.py | 414 +++++++++ oauthlib/oauth1/__init__.py | 19 + oauthlib/oauth1/rfc5849/__init__.py | 320 +++++++ oauthlib/oauth1/rfc5849/endpoints/__init__.py | 9 + .../oauth1/rfc5849/endpoints/access_token.py | 208 +++++ .../oauth1/rfc5849/endpoints/authorization.py | 161 ++++ oauthlib/oauth1/rfc5849/endpoints/base.py | 216 +++++ .../rfc5849/endpoints/pre_configured.py | 14 + .../oauth1/rfc5849/endpoints/request_token.py | 202 +++++ oauthlib/oauth1/rfc5849/endpoints/resource.py | 158 ++++ .../rfc5849/endpoints/signature_only.py | 74 ++ oauthlib/oauth1/rfc5849/errors.py | 79 ++ oauthlib/oauth1/rfc5849/parameters.py | 137 +++ oauthlib/oauth1/rfc5849/request_validator.py | 823 ++++++++++++++++++ oauthlib/oauth1/rfc5849/signature.py | 609 +++++++++++++ oauthlib/oauth1/rfc5849/utils.py | 89 ++ oauthlib/oauth2/__init__.py | 34 + oauthlib/oauth2/rfc6749/__init__.py | 66 ++ oauthlib/oauth2/rfc6749/clients/__init__.py | 16 + .../rfc6749/clients/backend_application.py | 61 ++ oauthlib/oauth2/rfc6749/clients/base.py | 490 +++++++++++ .../rfc6749/clients/legacy_application.py | 73 ++ .../rfc6749/clients/mobile_application.py | 173 ++++ .../rfc6749/clients/service_application.py | 176 ++++ .../oauth2/rfc6749/clients/web_application.py | 176 ++++ oauthlib/oauth2/rfc6749/endpoints/__init__.py | 19 + .../oauth2/rfc6749/endpoints/authorization.py | 114 +++ oauthlib/oauth2/rfc6749/endpoints/base.py | 65 ++ .../rfc6749/endpoints/pre_configured.py | 209 +++++ oauthlib/oauth2/rfc6749/endpoints/resource.py | 87 ++ .../oauth2/rfc6749/endpoints/revocation.py | 129 +++ oauthlib/oauth2/rfc6749/endpoints/token.py | 100 +++ oauthlib/oauth2/rfc6749/errors.py | 259 ++++++ .../oauth2/rfc6749/grant_types/__init__.py | 12 + .../rfc6749/grant_types/authorization_code.py | 393 +++++++++ oauthlib/oauth2/rfc6749/grant_types/base.py | 40 + .../rfc6749/grant_types/client_credentials.py | 112 +++ .../oauth2/rfc6749/grant_types/implicit.py | 338 +++++++ .../rfc6749/grant_types/refresh_token.py | 119 +++ .../resource_owner_password_credentials.py | 194 +++++ oauthlib/oauth2/rfc6749/parameters.py | 406 +++++++++ oauthlib/oauth2/rfc6749/request_validator.py | 460 ++++++++++ oauthlib/oauth2/rfc6749/tokens.py | 294 +++++++ oauthlib/oauth2/rfc6749/utils.py | 96 ++ oauthlib/signals.py | 41 + oauthlib/uri_validate.py | 215 +++++ 49 files changed, 8555 insertions(+) create mode 100644 docs/oauthlib-LICENSE.txt create mode 100644 docs/oauthlib-PKG-INFO create mode 100644 oauthlib/__init__.py create mode 100644 oauthlib/common.py create mode 100644 oauthlib/oauth1/__init__.py create mode 100644 oauthlib/oauth1/rfc5849/__init__.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/__init__.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/access_token.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/authorization.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/base.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/pre_configured.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/request_token.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/resource.py create mode 100644 oauthlib/oauth1/rfc5849/endpoints/signature_only.py create mode 100644 oauthlib/oauth1/rfc5849/errors.py create mode 100644 oauthlib/oauth1/rfc5849/parameters.py create mode 100644 oauthlib/oauth1/rfc5849/request_validator.py create mode 100644 oauthlib/oauth1/rfc5849/signature.py create mode 100644 oauthlib/oauth1/rfc5849/utils.py create mode 100644 oauthlib/oauth2/__init__.py create mode 100644 oauthlib/oauth2/rfc6749/__init__.py create mode 100644 oauthlib/oauth2/rfc6749/clients/__init__.py create mode 100644 oauthlib/oauth2/rfc6749/clients/backend_application.py create mode 100644 oauthlib/oauth2/rfc6749/clients/base.py create mode 100644 oauthlib/oauth2/rfc6749/clients/legacy_application.py create mode 100644 oauthlib/oauth2/rfc6749/clients/mobile_application.py create mode 100644 oauthlib/oauth2/rfc6749/clients/service_application.py create mode 100644 oauthlib/oauth2/rfc6749/clients/web_application.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/__init__.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/authorization.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/base.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/pre_configured.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/resource.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/revocation.py create mode 100644 oauthlib/oauth2/rfc6749/endpoints/token.py create mode 100644 oauthlib/oauth2/rfc6749/errors.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/__init__.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/authorization_code.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/base.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/client_credentials.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/implicit.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/refresh_token.py create mode 100644 oauthlib/oauth2/rfc6749/grant_types/resource_owner_password_credentials.py create mode 100644 oauthlib/oauth2/rfc6749/parameters.py create mode 100644 oauthlib/oauth2/rfc6749/request_validator.py create mode 100644 oauthlib/oauth2/rfc6749/tokens.py create mode 100644 oauthlib/oauth2/rfc6749/utils.py create mode 100644 oauthlib/signals.py create mode 100644 oauthlib/uri_validate.py diff --git a/docs/oauthlib-LICENSE.txt b/docs/oauthlib-LICENSE.txt new file mode 100644 index 0000000..8f5e8bd --- /dev/null +++ b/docs/oauthlib-LICENSE.txt @@ -0,0 +1,21 @@ +The MIT License + +Copyright (c) 2007 Leah Culver + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. \ No newline at end of file diff --git a/docs/oauthlib-PKG-INFO b/docs/oauthlib-PKG-INFO new file mode 100644 index 0000000..c27aaff --- /dev/null +++ b/docs/oauthlib-PKG-INFO @@ -0,0 +1,10 @@ +Metadata-Version: 1.0 +Name: oauth +Version: 1.0.1 +Summary: Library for OAuth version 1.0a. +Home-page: http://code.google.com/p/oauth +Author: Leah Culver +Author-email: leah.culver@gmail.com +License: MIT License +Description: UNKNOWN +Platform: UNKNOWN diff --git a/oauthlib/__init__.py b/oauthlib/__init__.py new file mode 100644 index 0000000..300bdc7 --- /dev/null +++ b/oauthlib/__init__.py @@ -0,0 +1,25 @@ +""" + oauthlib + ~~~~~~~~ + + A generic, spec-compliant, thorough implementation of the OAuth + request-signing logic. + + :copyright: (c) 2011 by Idan Gazit. + :license: BSD, see LICENSE for details. +""" + +__author__ = 'Idan Gazit ' +__version__ = '0.7.2' + + +import logging +try: # Python 2.7+ + from logging import NullHandler +except ImportError: + class NullHandler(logging.Handler): + + def emit(self, record): + pass + +logging.getLogger('oauthlib').addHandler(NullHandler()) diff --git a/oauthlib/common.py b/oauthlib/common.py new file mode 100644 index 0000000..0179b8e --- /dev/null +++ b/oauthlib/common.py @@ -0,0 +1,414 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.common +~~~~~~~~~~~~~~ + +This module provides data structures and utilities common +to all implementations of OAuth. +""" +from __future__ import absolute_import, unicode_literals + +import collections +import datetime +import logging +import random +import re +import sys +import time + +try: + from urllib import quote as _quote + from urllib import unquote as _unquote + from urllib import urlencode as _urlencode +except ImportError: + from urllib.parse import quote as _quote + from urllib.parse import unquote as _unquote + from urllib.parse import urlencode as _urlencode +try: + import urlparse +except ImportError: + import urllib.parse as urlparse + +UNICODE_ASCII_CHARACTER_SET = ('abcdefghijklmnopqrstuvwxyz' + 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' + '0123456789') + +CLIENT_ID_CHARACTER_SET = (r' !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMN' + 'OPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}') + + +always_safe = ('ABCDEFGHIJKLMNOPQRSTUVWXYZ' + 'abcdefghijklmnopqrstuvwxyz' + '0123456789' '_.-') + +log = logging.getLogger('oauthlib') + +PY3 = sys.version_info[0] == 3 + +if PY3: + unicode_type = str + bytes_type = bytes +else: + unicode_type = unicode + bytes_type = str + + +# 'safe' must be bytes (Python 2.6 requires bytes, other versions allow either) +def quote(s, safe=b'/'): + s = s.encode('utf-8') if isinstance(s, unicode_type) else s + s = _quote(s, safe) + # PY3 always returns unicode. PY2 may return either, depending on whether + # it had to modify the string. + if isinstance(s, bytes_type): + s = s.decode('utf-8') + return s + + +def unquote(s): + s = _unquote(s) + # PY3 always returns unicode. PY2 seems to always return what you give it, + # which differs from quote's behavior. Just to be safe, make sure it is + # unicode before we return. + if isinstance(s, bytes_type): + s = s.decode('utf-8') + return s + + +def urlencode(params): + utf8_params = encode_params_utf8(params) + urlencoded = _urlencode(utf8_params) + if isinstance(urlencoded, unicode_type): # PY3 returns unicode + return urlencoded + else: + return urlencoded.decode("utf-8") + + +def encode_params_utf8(params): + """Ensures that all parameters in a list of 2-element tuples are encoded to + bytestrings using UTF-8 + """ + encoded = [] + for k, v in params: + encoded.append(( + k.encode('utf-8') if isinstance(k, unicode_type) else k, + v.encode('utf-8') if isinstance(v, unicode_type) else v)) + return encoded + + +def decode_params_utf8(params): + """Ensures that all parameters in a list of 2-element tuples are decoded to + unicode using UTF-8. + """ + decoded = [] + for k, v in params: + decoded.append(( + k.decode('utf-8') if isinstance(k, bytes_type) else k, + v.decode('utf-8') if isinstance(v, bytes_type) else v)) + return decoded + + +urlencoded = set(always_safe) | set('=&;%+~,*@') + + +def urldecode(query): + """Decode a query string in x-www-form-urlencoded format into a sequence + of two-element tuples. + + Unlike urlparse.parse_qsl(..., strict_parsing=True) urldecode will enforce + correct formatting of the query string by validation. If validation fails + a ValueError will be raised. urllib.parse_qsl will only raise errors if + any of name-value pairs omits the equals sign. + """ + # Check if query contains invalid characters + if query and not set(query) <= urlencoded: + error = ("Error trying to decode a non urlencoded string. " + "Found invalid characters: %s " + "in the string: '%s'. " + "Please ensure the request/response body is " + "x-www-form-urlencoded.") + raise ValueError(error % (set(query) - urlencoded, query)) + + # Check for correctly hex encoded values using a regular expression + # All encoded values begin with % followed by two hex characters + # correct = %00, %A0, %0A, %FF + # invalid = %G0, %5H, %PO + invalid_hex = '%[^0-9A-Fa-f]|%[0-9A-Fa-f][^0-9A-Fa-f]' + if len(re.findall(invalid_hex, query)): + raise ValueError('Invalid hex encoding in query string.') + + # We encode to utf-8 prior to parsing because parse_qsl behaves + # differently on unicode input in python 2 and 3. + # Python 2.7 + # >>> urlparse.parse_qsl(u'%E5%95%A6%E5%95%A6') + # u'\xe5\x95\xa6\xe5\x95\xa6' + # Python 2.7, non unicode input gives the same + # >>> urlparse.parse_qsl('%E5%95%A6%E5%95%A6') + # '\xe5\x95\xa6\xe5\x95\xa6' + # but now we can decode it to unicode + # >>> urlparse.parse_qsl('%E5%95%A6%E5%95%A6').decode('utf-8') + # u'\u5566\u5566' + # Python 3.3 however + # >>> urllib.parse.parse_qsl(u'%E5%95%A6%E5%95%A6') + # u'\u5566\u5566' + query = query.encode( + 'utf-8') if not PY3 and isinstance(query, unicode_type) else query + # We want to allow queries such as "c2" whereas urlparse.parse_qsl + # with the strict_parsing flag will not. + params = urlparse.parse_qsl(query, keep_blank_values=True) + + # unicode all the things + return decode_params_utf8(params) + + +def extract_params(raw): + """Extract parameters and return them as a list of 2-tuples. + + Will successfully extract parameters from urlencoded query strings, + dicts, or lists of 2-tuples. Empty strings/dicts/lists will return an + empty list of parameters. Any other input will result in a return + value of None. + """ + if isinstance(raw, bytes_type) or isinstance(raw, unicode_type): + try: + params = urldecode(raw) + except ValueError: + params = None + elif hasattr(raw, '__iter__'): + try: + dict(raw) + except ValueError: + params = None + except TypeError: + params = None + else: + params = list(raw.items() if isinstance(raw, dict) else raw) + params = decode_params_utf8(params) + else: + params = None + + return params + + +def generate_nonce(): + """Generate pseudorandom nonce that is unlikely to repeat. + + Per `section 3.3`_ of the OAuth 1 RFC 5849 spec. + Per `section 3.2.1`_ of the MAC Access Authentication spec. + + A random 64-bit number is appended to the epoch timestamp for both + randomness and to decrease the likelihood of collisions. + + .. _`section 3.2.1`: http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1 + .. _`section 3.3`: http://tools.ietf.org/html/rfc5849#section-3.3 + """ + return unicode_type(unicode_type(random.getrandbits(64)) + generate_timestamp()) + + +def generate_timestamp(): + """Get seconds since epoch (UTC). + + Per `section 3.3`_ of the OAuth 1 RFC 5849 spec. + Per `section 3.2.1`_ of the MAC Access Authentication spec. + + .. _`section 3.2.1`: http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1 + .. _`section 3.3`: http://tools.ietf.org/html/rfc5849#section-3.3 + """ + return unicode_type(int(time.time())) + + +def generate_token(length=30, chars=UNICODE_ASCII_CHARACTER_SET): + """Generates a non-guessable OAuth token + + OAuth (1 and 2) does not specify the format of tokens except that they + should be strings of random characters. Tokens should not be guessable + and entropy when generating the random characters is important. Which is + why SystemRandom is used instead of the default random.choice method. + """ + rand = random.SystemRandom() + return ''.join(rand.choice(chars) for x in range(length)) + + +def generate_signed_token(private_pem, request): + import jwt + + now = datetime.datetime.utcnow() + + claims = { + 'scope': request.scope, + 'exp': now + datetime.timedelta(seconds=request.expires_in) + } + + claims.update(request.claims) + + token = jwt.encode(claims, private_pem, 'RS256') + token = to_unicode(token, "UTF-8") + + return token + + +def verify_signed_token(public_pem, token): + import jwt + + return jwt.decode(token, public_pem, algorithms=['RS256']) + + +def generate_client_id(length=30, chars=CLIENT_ID_CHARACTER_SET): + """Generates an OAuth client_id + + OAuth 2 specify the format of client_id in + http://tools.ietf.org/html/rfc6749#appendix-A. + """ + return generate_token(length, chars) + + +def add_params_to_qs(query, params): + """Extend a query with a list of two-tuples.""" + if isinstance(params, dict): + params = params.items() + queryparams = urlparse.parse_qsl(query, keep_blank_values=True) + queryparams.extend(params) + return urlencode(queryparams) + + +def add_params_to_uri(uri, params, fragment=False): + """Add a list of two-tuples to the uri query components.""" + sch, net, path, par, query, fra = urlparse.urlparse(uri) + if fragment: + fra = add_params_to_qs(fra, params) + else: + query = add_params_to_qs(query, params) + return urlparse.urlunparse((sch, net, path, par, query, fra)) + + +def safe_string_equals(a, b): + """ Near-constant time string comparison. + + Used in order to avoid timing attacks on sensitive information such + as secret keys during request verification (`rootLabs`_). + + .. _`rootLabs`: http://rdist.root.org/2010/01/07/timing-independent-array-comparison/ + + """ + if len(a) != len(b): + return False + + result = 0 + for x, y in zip(a, b): + result |= ord(x) ^ ord(y) + return result == 0 + + +def to_unicode(data, encoding='UTF-8'): + """Convert a number of different types of objects to unicode.""" + if isinstance(data, unicode_type): + return data + + if isinstance(data, bytes_type): + return unicode_type(data, encoding=encoding) + + if hasattr(data, '__iter__'): + try: + dict(data) + except TypeError: + pass + except ValueError: + # Assume it's a one dimensional data structure + return (to_unicode(i, encoding) for i in data) + else: + # We support 2.6 which lacks dict comprehensions + if hasattr(data, 'items'): + data = data.items() + return dict(((to_unicode(k, encoding), to_unicode(v, encoding)) for k, v in data)) + + return data + + +class CaseInsensitiveDict(dict): + + """Basic case insensitive dict with strings only keys.""" + + proxy = {} + + def __init__(self, data): + self.proxy = dict((k.lower(), k) for k in data) + for k in data: + self[k] = data[k] + + def __contains__(self, k): + return k.lower() in self.proxy + + def __delitem__(self, k): + key = self.proxy[k.lower()] + super(CaseInsensitiveDict, self).__delitem__(key) + del self.proxy[k.lower()] + + def __getitem__(self, k): + key = self.proxy[k.lower()] + return super(CaseInsensitiveDict, self).__getitem__(key) + + def get(self, k, default=None): + return self[k] if k in self else default + + def __setitem__(self, k, v): + super(CaseInsensitiveDict, self).__setitem__(k, v) + self.proxy[k.lower()] = k + + +class Request(object): + + """A malleable representation of a signable HTTP request. + + Body argument may contain any data, but parameters will only be decoded if + they are one of: + + * urlencoded query string + * dict + * list of 2-tuples + + Anything else will be treated as raw body data to be passed through + unmolested. + """ + + def __init__(self, uri, http_method='GET', body=None, headers=None, + encoding='utf-8'): + # Convert to unicode using encoding if given, else assume unicode + encode = lambda x: to_unicode(x, encoding) if encoding else x + + self.uri = encode(uri) + self.http_method = encode(http_method) + self.headers = CaseInsensitiveDict(encode(headers or {})) + self.body = encode(body) + self.decoded_body = extract_params(encode(body)) + self.oauth_params = [] + + self._params = {} + self._params.update(dict(urldecode(self.uri_query))) + self._params.update(dict(self.decoded_body or [])) + self._params.update(self.headers) + + def __getattr__(self, name): + return self._params.get(name, None) + + def __repr__(self): + return '' % ( + self.uri, self.http_method, self.headers, self.body) + + @property + def uri_query(self): + return urlparse.urlparse(self.uri).query + + @property + def uri_query_params(self): + if not self.uri_query: + return [] + return urlparse.parse_qsl(self.uri_query, keep_blank_values=True, + strict_parsing=True) + + @property + def duplicate_params(self): + seen_keys = collections.defaultdict(int) + all_keys = (p[0] + for p in (self.decoded_body or []) + self.uri_query_params) + for k in all_keys: + seen_keys[k] += 1 + return [k for k, c in seen_keys.items() if c > 1] diff --git a/oauthlib/oauth1/__init__.py b/oauthlib/oauth1/__init__.py new file mode 100644 index 0000000..b2bc0f9 --- /dev/null +++ b/oauthlib/oauth1/__init__.py @@ -0,0 +1,19 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1 +~~~~~~~~~~~~~~ + +This module is a wrapper for the most recent implementation of OAuth 1.0 Client +and Server classes. +""" +from __future__ import absolute_import, unicode_literals + +from .rfc5849 import Client +from .rfc5849 import SIGNATURE_HMAC, SIGNATURE_RSA, SIGNATURE_PLAINTEXT +from .rfc5849 import SIGNATURE_TYPE_AUTH_HEADER, SIGNATURE_TYPE_QUERY +from .rfc5849 import SIGNATURE_TYPE_BODY +from .rfc5849.request_validator import RequestValidator +from .rfc5849.endpoints import RequestTokenEndpoint, AuthorizationEndpoint +from .rfc5849.endpoints import AccessTokenEndpoint, ResourceEndpoint +from .rfc5849.endpoints import SignatureOnlyEndpoint, WebApplicationServer +from .rfc5849.errors import * diff --git a/oauthlib/oauth1/rfc5849/__init__.py b/oauthlib/oauth1/rfc5849/__init__.py new file mode 100644 index 0000000..ad9713c --- /dev/null +++ b/oauthlib/oauth1/rfc5849/__init__.py @@ -0,0 +1,320 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849 +~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for signing and checking OAuth 1.0 RFC 5849 requests. +""" +from __future__ import absolute_import, unicode_literals + +import logging +log = logging.getLogger(__name__) + +import sys +try: + import urlparse +except ImportError: + import urllib.parse as urlparse + +if sys.version_info[0] == 3: + bytes_type = bytes +else: + bytes_type = str + +from oauthlib.common import Request, urlencode, generate_nonce +from oauthlib.common import generate_timestamp, to_unicode +from . import parameters, signature + +SIGNATURE_HMAC = "HMAC-SHA1" +SIGNATURE_RSA = "RSA-SHA1" +SIGNATURE_PLAINTEXT = "PLAINTEXT" +SIGNATURE_METHODS = (SIGNATURE_HMAC, SIGNATURE_RSA, SIGNATURE_PLAINTEXT) + +SIGNATURE_TYPE_AUTH_HEADER = 'AUTH_HEADER' +SIGNATURE_TYPE_QUERY = 'QUERY' +SIGNATURE_TYPE_BODY = 'BODY' + +CONTENT_TYPE_FORM_URLENCODED = 'application/x-www-form-urlencoded' + + +class Client(object): + + """A client used to sign OAuth 1.0 RFC 5849 requests.""" + SIGNATURE_METHODS = { + SIGNATURE_HMAC: signature.sign_hmac_sha1_with_client, + SIGNATURE_RSA: signature.sign_rsa_sha1_with_client, + SIGNATURE_PLAINTEXT: signature.sign_plaintext_with_client + } + + @classmethod + def register_signature_method(cls, method_name, method_callback): + cls.SIGNATURE_METHODS[method_name] = method_callback + + def __init__(self, client_key, + client_secret=None, + resource_owner_key=None, + resource_owner_secret=None, + callback_uri=None, + signature_method=SIGNATURE_HMAC, + signature_type=SIGNATURE_TYPE_AUTH_HEADER, + rsa_key=None, verifier=None, realm=None, + encoding='utf-8', decoding=None, + nonce=None, timestamp=None): + """Create an OAuth 1 client. + + :param client_key: Client key (consumer key), mandatory. + :param resource_owner_key: Resource owner key (oauth token). + :param resource_owner_secret: Resource owner secret (oauth token secret). + :param callback_uri: Callback used when obtaining request token. + :param signature_method: SIGNATURE_HMAC, SIGNATURE_RSA or SIGNATURE_PLAINTEXT. + :param signature_type: SIGNATURE_TYPE_AUTH_HEADER (default), + SIGNATURE_TYPE_QUERY or SIGNATURE_TYPE_BODY + depending on where you want to embed the oauth + credentials. + :param rsa_key: RSA key used with SIGNATURE_RSA. + :param verifier: Verifier used when obtaining an access token. + :param realm: Realm (scope) to which access is being requested. + :param encoding: If you provide non-unicode input you may use this + to have oauthlib automatically convert. + :param decoding: If you wish that the returned uri, headers and body + from sign be encoded back from unicode, then set + decoding to your preferred encoding, i.e. utf-8. + :param nonce: Use this nonce instead of generating one. (Mainly for testing) + :param timestamp: Use this timestamp instead of using current. (Mainly for testing) + """ + # Convert to unicode using encoding if given, else assume unicode + encode = lambda x: to_unicode(x, encoding) if encoding else x + + self.client_key = encode(client_key) + self.client_secret = encode(client_secret) + self.resource_owner_key = encode(resource_owner_key) + self.resource_owner_secret = encode(resource_owner_secret) + self.signature_method = encode(signature_method) + self.signature_type = encode(signature_type) + self.callback_uri = encode(callback_uri) + self.rsa_key = encode(rsa_key) + self.verifier = encode(verifier) + self.realm = encode(realm) + self.encoding = encode(encoding) + self.decoding = encode(decoding) + self.nonce = encode(nonce) + self.timestamp = encode(timestamp) + + if self.signature_method == SIGNATURE_RSA and self.rsa_key is None: + raise ValueError( + 'rsa_key is required when using RSA signature method.') + + def __repr__(self): + attrs = vars(self).copy() + attrs['client_secret'] = '****' if attrs['client_secret'] else None + attrs[ + 'resource_owner_secret'] = '****' if attrs['resource_owner_secret'] else None + attribute_str = ', '.join('%s=%s' % (k, v) for k, v in attrs.items()) + return '<%s %s>' % (self.__class__.__name__, attribute_str) + + def get_oauth_signature(self, request): + """Get an OAuth signature to be used in signing a request + + To satisfy `section 3.4.1.2`_ item 2, if the request argument's + headers dict attribute contains a Host item, its value will + replace any netloc part of the request argument's uri attribute + value. + + .. _`section 3.4.1.2`: http://tools.ietf.org/html/rfc5849#section-3.4.1.2 + """ + if self.signature_method == SIGNATURE_PLAINTEXT: + # fast-path + return signature.sign_plaintext(self.client_secret, + self.resource_owner_secret) + + uri, headers, body = self._render(request) + + collected_params = signature.collect_parameters( + uri_query=urlparse.urlparse(uri).query, + body=body, + headers=headers) + log.debug("Collected params: {0}".format(collected_params)) + + normalized_params = signature.normalize_parameters(collected_params) + normalized_uri = signature.normalize_base_string_uri(uri, + headers.get('Host', None)) + log.debug("Normalized params: {0}".format(normalized_params)) + log.debug("Normalized URI: {0}".format(normalized_uri)) + + base_string = signature.construct_base_string(request.http_method, + normalized_uri, normalized_params) + + log.debug("Base signing string: {0}".format(base_string)) + + if self.signature_method not in self.SIGNATURE_METHODS: + raise ValueError('Invalid signature method.') + + sig = self.SIGNATURE_METHODS[self.signature_method](base_string, self) + + log.debug("Signature: {0}".format(sig)) + return sig + + def get_oauth_params(self, request): + """Get the basic OAuth parameters to be used in generating a signature. + """ + nonce = (generate_nonce() + if self.nonce is None else self.nonce) + timestamp = (generate_timestamp() + if self.timestamp is None else self.timestamp) + params = [ + ('oauth_nonce', nonce), + ('oauth_timestamp', timestamp), + ('oauth_version', '1.0'), + ('oauth_signature_method', self.signature_method), + ('oauth_consumer_key', self.client_key), + ] + if self.resource_owner_key: + params.append(('oauth_token', self.resource_owner_key)) + if self.callback_uri: + params.append(('oauth_callback', self.callback_uri)) + if self.verifier: + params.append(('oauth_verifier', self.verifier)) + + return params + + def _render(self, request, formencode=False, realm=None): + """Render a signed request according to signature type + + Returns a 3-tuple containing the request URI, headers, and body. + + If the formencode argument is True and the body contains parameters, it + is escaped and returned as a valid formencoded string. + """ + # TODO what if there are body params on a header-type auth? + # TODO what if there are query params on a body-type auth? + + uri, headers, body = request.uri, request.headers, request.body + + # TODO: right now these prepare_* methods are very narrow in scope--they + # only affect their little thing. In some cases (for example, with + # header auth) it might be advantageous to allow these methods to touch + # other parts of the request, like the headers—so the prepare_headers + # method could also set the Content-Type header to x-www-form-urlencoded + # like the spec requires. This would be a fundamental change though, and + # I'm not sure how I feel about it. + if self.signature_type == SIGNATURE_TYPE_AUTH_HEADER: + headers = parameters.prepare_headers( + request.oauth_params, request.headers, realm=realm) + elif self.signature_type == SIGNATURE_TYPE_BODY and request.decoded_body is not None: + body = parameters.prepare_form_encoded_body( + request.oauth_params, request.decoded_body) + if formencode: + body = urlencode(body) + headers['Content-Type'] = 'application/x-www-form-urlencoded' + elif self.signature_type == SIGNATURE_TYPE_QUERY: + uri = parameters.prepare_request_uri_query( + request.oauth_params, request.uri) + else: + raise ValueError('Unknown signature type specified.') + + return uri, headers, body + + def sign(self, uri, http_method='GET', body=None, headers=None, realm=None): + """Sign a request + + Signs an HTTP request with the specified parts. + + Returns a 3-tuple of the signed request's URI, headers, and body. + Note that http_method is not returned as it is unaffected by the OAuth + signing process. Also worth noting is that duplicate parameters + will be included in the signature, regardless of where they are + specified (query, body). + + The body argument may be a dict, a list of 2-tuples, or a formencoded + string. The Content-Type header must be 'application/x-www-form-urlencoded' + if it is present. + + If the body argument is not one of the above, it will be returned + verbatim as it is unaffected by the OAuth signing process. Attempting to + sign a request with non-formencoded data using the OAuth body signature + type is invalid and will raise an exception. + + If the body does contain parameters, it will be returned as a properly- + formatted formencoded string. + + Body may not be included if the http_method is either GET or HEAD as + this changes the semantic meaning of the request. + + All string data MUST be unicode or be encoded with the same encoding + scheme supplied to the Client constructor, default utf-8. This includes + strings inside body dicts, for example. + """ + # normalize request data + request = Request(uri, http_method, body, headers, + encoding=self.encoding) + + # sanity check + content_type = request.headers.get('Content-Type', None) + multipart = content_type and content_type.startswith('multipart/') + should_have_params = content_type == CONTENT_TYPE_FORM_URLENCODED + has_params = request.decoded_body is not None + # 3.4.1.3.1. Parameter Sources + # [Parameters are collected from the HTTP request entity-body, but only + # if [...]: + # * The entity-body is single-part. + if multipart and has_params: + raise ValueError( + "Headers indicate a multipart body but body contains parameters.") + # * The entity-body follows the encoding requirements of the + # "application/x-www-form-urlencoded" content-type as defined by + # [W3C.REC-html40-19980424]. + elif should_have_params and not has_params: + raise ValueError( + "Headers indicate a formencoded body but body was not decodable.") + # * The HTTP request entity-header includes the "Content-Type" + # header field set to "application/x-www-form-urlencoded". + elif not should_have_params and has_params: + raise ValueError( + "Body contains parameters but Content-Type header was {0} " + "instead of {1}".format(content_type or "not set", + CONTENT_TYPE_FORM_URLENCODED)) + + # 3.5.2. Form-Encoded Body + # Protocol parameters can be transmitted in the HTTP request entity- + # body, but only if the following REQUIRED conditions are met: + # o The entity-body is single-part. + # o The entity-body follows the encoding requirements of the + # "application/x-www-form-urlencoded" content-type as defined by + # [W3C.REC-html40-19980424]. + # o The HTTP request entity-header includes the "Content-Type" header + # field set to "application/x-www-form-urlencoded". + elif self.signature_type == SIGNATURE_TYPE_BODY and not ( + should_have_params and has_params and not multipart): + raise ValueError( + 'Body signatures may only be used with form-urlencoded content') + + # We amend http://tools.ietf.org/html/rfc5849#section-3.4.1.3.1 + # with the clause that parameters from body should only be included + # in non GET or HEAD requests. Extracting the request body parameters + # and including them in the signature base string would give semantic + # meaning to the body, which it should not have according to the + # HTTP 1.1 spec. + elif http_method.upper() in ('GET', 'HEAD') and has_params: + raise ValueError('GET/HEAD requests should not include body.') + + # generate the basic OAuth parameters + request.oauth_params = self.get_oauth_params(request) + + # generate the signature + request.oauth_params.append( + ('oauth_signature', self.get_oauth_signature(request))) + + # render the signed request and return it + uri, headers, body = self._render(request, formencode=True, + realm=(realm or self.realm)) + + if self.decoding: + log.debug('Encoding URI, headers and body to %s.', self.decoding) + uri = uri.encode(self.decoding) + body = body.encode(self.decoding) if body else body + new_headers = {} + for k, v in headers.items(): + new_headers[k.encode(self.decoding)] = v.encode(self.decoding) + headers = new_headers + return uri, headers, body diff --git a/oauthlib/oauth1/rfc5849/endpoints/__init__.py b/oauthlib/oauth1/rfc5849/endpoints/__init__.py new file mode 100644 index 0000000..b16ccba --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/__init__.py @@ -0,0 +1,9 @@ +from __future__ import absolute_import + +from .base import BaseEndpoint +from .request_token import RequestTokenEndpoint +from .authorization import AuthorizationEndpoint +from .access_token import AccessTokenEndpoint +from .resource import ResourceEndpoint +from .signature_only import SignatureOnlyEndpoint +from .pre_configured import WebApplicationServer diff --git a/oauthlib/oauth1/rfc5849/endpoints/access_token.py b/oauthlib/oauth1/rfc5849/endpoints/access_token.py new file mode 100644 index 0000000..26db919 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/access_token.py @@ -0,0 +1,208 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.endpoints.access_token +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of the access token provider logic of +OAuth 1.0 RFC 5849. It validates the correctness of access token requests, +creates and persists tokens as well as create the proper response to be +returned to the client. +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from oauthlib.common import urlencode + +from .base import BaseEndpoint +from .. import errors + +log = logging.getLogger(__name__) + + +class AccessTokenEndpoint(BaseEndpoint): + + """An endpoint responsible for providing OAuth 1 access tokens. + + Typical use is to instantiate with a request validator and invoke the + ``create_access_token_response`` from a view function. The tuple returned + has all information necessary (body, status, headers) to quickly form + and return a proper response. See :doc:`/oauth1/validator` for details on which + validator methods to implement for this endpoint. + """ + + def create_access_token(self, request, credentials): + """Create and save a new access token. + + Similar to OAuth 2, indication of granted scopes will be included as a + space separated list in ``oauth_authorized_realms``. + + :param request: An oauthlib.common.Request object. + :returns: The token as an urlencoded string. + """ + request.realms = self.request_validator.get_realms( + request.resource_owner_key, request) + token = { + 'oauth_token': self.token_generator(), + 'oauth_token_secret': self.token_generator(), + # Backport the authorized scopes indication used in OAuth2 + 'oauth_authorized_realms': ' '.join(request.realms) + } + token.update(credentials) + self.request_validator.save_access_token(token, request) + return urlencode(token.items()) + + def create_access_token_response(self, uri, http_method='GET', body=None, + headers=None, credentials=None): + """Create an access token response, with a new request token if valid. + + :param uri: The full URI of the token request. + :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. + :param body: The request body as a string. + :param headers: The request headers as a dict. + :param credentials: A list of extra credentials to include in the token. + :returns: A tuple of 3 elements. + 1. A dict of headers to set on the response. + 2. The response body as a string. + 3. The response status code as an integer. + + An example of a valid request:: + + >>> from your_validator import your_validator + >>> from oauthlib.oauth1 import AccessTokenEndpoint + >>> endpoint = AccessTokenEndpoint(your_validator) + >>> h, b, s = endpoint.create_access_token_response( + ... 'https://your.provider/access_token?foo=bar', + ... headers={ + ... 'Authorization': 'OAuth oauth_token=234lsdkf....' + ... }, + ... credentials={ + ... 'my_specific': 'argument', + ... }) + >>> h + {'Content-Type': 'application/x-www-form-urlencoded'} + >>> b + 'oauth_token=lsdkfol23w54jlksdef&oauth_token_secret=qwe089234lkjsdf&oauth_authorized_realms=movies+pics&my_specific=argument' + >>> s + 200 + + An response to invalid request would have a different body and status:: + + >>> b + 'error=invalid_request&description=missing+resource+owner+key' + >>> s + 400 + + The same goes for an an unauthorized request: + + >>> b + '' + >>> s + 401 + """ + resp_headers = {'Content-Type': 'application/x-www-form-urlencoded'} + try: + request = self._create_request(uri, http_method, body, headers) + valid, processed_request = self.validate_access_token_request( + request) + if valid: + token = self.create_access_token(request, credentials or {}) + self.request_validator.invalidate_request_token( + request.client_key, + request.resource_owner_key, + request) + return resp_headers, token, 200 + else: + return {}, None, 401 + except errors.OAuth1Error as e: + return resp_headers, e.urlencoded, e.status_code + + def validate_access_token_request(self, request): + """Validate an access token request. + + :param request: An oauthlib.common.Request object. + :raises: OAuth1Error if the request is invalid. + :returns: A tuple of 2 elements. + 1. The validation result (True or False). + 2. The request object. + """ + self._check_transport_security(request) + self._check_mandatory_parameters(request) + + if not request.resource_owner_key: + raise errors.InvalidRequestError( + description='Missing resource owner.') + + if not self.request_validator.check_request_token( + request.resource_owner_key): + raise errors.InvalidRequestError( + description='Invalid resource owner key format.') + + if not request.verifier: + raise errors.InvalidRequestError( + description='Missing verifier.') + + if not self.request_validator.check_verifier(request.verifier): + raise errors.InvalidRequestError( + description='Invalid verifier format.') + + if not self.request_validator.validate_timestamp_and_nonce( + request.client_key, request.timestamp, request.nonce, request, + request_token=request.resource_owner_key): + return False, request + + # The server SHOULD return a 401 (Unauthorized) status code when + # receiving a request with invalid client credentials. + # Note: This is postponed in order to avoid timing attacks, instead + # a dummy client is assigned and used to maintain near constant + # time request verification. + # + # Note that early exit would enable client enumeration + valid_client = self.request_validator.validate_client_key( + request.client_key, request) + if not valid_client: + request.client_key = self.request_validator.dummy_client + + # The server SHOULD return a 401 (Unauthorized) status code when + # receiving a request with invalid or expired token. + # Note: This is postponed in order to avoid timing attacks, instead + # a dummy token is assigned and used to maintain near constant + # time request verification. + # + # Note that early exit would enable resource owner enumeration + valid_resource_owner = self.request_validator.validate_request_token( + request.client_key, request.resource_owner_key, request) + if not valid_resource_owner: + request.resource_owner_key = self.request_validator.dummy_request_token + + # The server MUST verify (Section 3.2) the validity of the request, + # ensure that the resource owner has authorized the provisioning of + # token credentials to the client, and ensure that the temporary + # credentials have not expired or been used before. The server MUST + # also verify the verification code received from the client. + # .. _`Section 3.2`: http://tools.ietf.org/html/rfc5849#section-3.2 + # + # Note that early exit would enable resource owner authorization + # verifier enumertion. + valid_verifier = self.request_validator.validate_verifier( + request.client_key, + request.resource_owner_key, + request.verifier, + request) + + valid_signature = self._check_signature(request, is_token_request=True) + + # We delay checking validity until the very end, using dummy values for + # calculations and fetching secrets/keys to ensure the flow of every + # request remains almost identical regardless of whether valid values + # have been supplied. This ensures near constant time execution and + # prevents malicious users from guessing sensitive information + v = all((valid_client, valid_resource_owner, valid_verifier, + valid_signature)) + if not v: + log.info("[Failure] request verification failed.") + log.info("Valid client:, %s", valid_client) + log.info("Valid token:, %s", valid_resource_owner) + log.info("Valid verifier:, %s", valid_verifier) + log.info("Valid signature:, %s", valid_signature) + return v, request diff --git a/oauthlib/oauth1/rfc5849/endpoints/authorization.py b/oauthlib/oauth1/rfc5849/endpoints/authorization.py new file mode 100644 index 0000000..a93a517 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/authorization.py @@ -0,0 +1,161 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.endpoints.authorization +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for signing and checking OAuth 1.0 RFC 5849 requests. +""" +from __future__ import absolute_import, unicode_literals + +from oauthlib.common import Request, add_params_to_uri + +from .base import BaseEndpoint +from .. import errors +try: + from urllib import urlencode +except ImportError: + from urllib.parse import urlencode + + +class AuthorizationEndpoint(BaseEndpoint): + + """An endpoint responsible for letting authenticated users authorize access + to their protected resources to a client. + + Typical use would be to have two views, one for displaying the authorization + form and one to process said form on submission. + + The first view will want to utilize ``get_realms_and_credentials`` to fetch + requested realms and useful client credentials, such as name and + description, to be used when creating the authorization form. + + During form processing you can use ``create_authorization_response`` to + validate the request, create a verifier as well as prepare the final + redirection URI used to send the user back to the client. + + See :doc:`/oauth1/validator` for details on which validator methods to implement + for this endpoint. + """ + + def create_verifier(self, request, credentials): + """Create and save a new request token. + + :param request: An oauthlib.common.Request object. + :param credentials: A dict of extra token credentials. + :returns: The verifier as a dict. + """ + verifier = { + 'oauth_token': request.resource_owner_key, + 'oauth_verifier': self.token_generator(), + } + verifier.update(credentials) + self.request_validator.save_verifier( + request.resource_owner_key, verifier, request) + return verifier + + def create_authorization_response(self, uri, http_method='GET', body=None, + headers=None, realms=None, credentials=None): + """Create an authorization response, with a new request token if valid. + + :param uri: The full URI of the token request. + :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. + :param body: The request body as a string. + :param headers: The request headers as a dict. + :param credentials: A list of credentials to include in the verifier. + :returns: A tuple of 3 elements. + 1. A dict of headers to set on the response. + 2. The response body as a string. + 3. The response status code as an integer. + + If the callback URI tied to the current token is "oob", a response with + a 200 status code will be returned. In this case, it may be desirable to + modify the response to better display the verifier to the client. + + An example of an authorization request:: + + >>> from your_validator import your_validator + >>> from oauthlib.oauth1 import AuthorizationEndpoint + >>> endpoint = AuthorizationEndpoint(your_validator) + >>> h, b, s = endpoint.create_authorization_response( + ... 'https://your.provider/authorize?oauth_token=...', + ... credentials={ + ... 'extra': 'argument', + ... }) + >>> h + {'Location': 'https://the.client/callback?oauth_verifier=...&extra=argument'} + >>> b + None + >>> s + 302 + + An example of a request with an "oob" callback:: + + >>> from your_validator import your_validator + >>> from oauthlib.oauth1 import AuthorizationEndpoint + >>> endpoint = AuthorizationEndpoint(your_validator) + >>> h, b, s = endpoint.create_authorization_response( + ... 'https://your.provider/authorize?foo=bar', + ... credentials={ + ... 'extra': 'argument', + ... }) + >>> h + {'Content-Type': 'application/x-www-form-urlencoded'} + >>> b + 'oauth_verifier=...&extra=argument' + >>> s + 200 + """ + request = self._create_request(uri, http_method=http_method, body=body, + headers=headers) + + if not request.resource_owner_key: + raise errors.InvalidRequestError( + 'Missing mandatory parameter oauth_token.') + if not self.request_validator.verify_request_token( + request.resource_owner_key, request): + raise errors.InvalidClientError() + + request.realms = realms + if (request.realms and not self.request_validator.verify_realms( + request.resource_owner_key, request.realms, request)): + raise errors.InvalidRequestError( + description=('User granted access to realms outside of ' + 'what the client may request.')) + + verifier = self.create_verifier(request, credentials or {}) + redirect_uri = self.request_validator.get_redirect_uri( + request.resource_owner_key, request) + if redirect_uri == 'oob': + response_headers = { + 'Content-Type': 'application/x-www-form-urlencoded'} + response_body = urlencode(verifier) + return response_headers, response_body, 200 + else: + populated_redirect = add_params_to_uri( + redirect_uri, verifier.items()) + return {'Location': populated_redirect}, None, 302 + + def get_realms_and_credentials(self, uri, http_method='GET', body=None, + headers=None): + """Fetch realms and credentials for the presented request token. + + :param uri: The full URI of the token request. + :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. + :param body: The request body as a string. + :param headers: The request headers as a dict. + :returns: A tuple of 2 elements. + 1. A list of request realms. + 2. A dict of credentials which may be useful in creating the + authorization form. + """ + request = self._create_request(uri, http_method=http_method, body=body, + headers=headers) + + if not self.request_validator.verify_request_token( + request.resource_owner_key, request): + raise errors.InvalidClientError() + + realms = self.request_validator.get_realms( + request.resource_owner_key, request) + return realms, {'resource_owner_key': request.resource_owner_key} diff --git a/oauthlib/oauth1/rfc5849/endpoints/base.py b/oauthlib/oauth1/rfc5849/endpoints/base.py new file mode 100644 index 0000000..42006a1 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/base.py @@ -0,0 +1,216 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.endpoints.base +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for signing and checking OAuth 1.0 RFC 5849 requests. +""" +from __future__ import absolute_import, unicode_literals + +import time + +from oauthlib.common import Request, generate_token + +from .. import signature, utils, errors +from .. import CONTENT_TYPE_FORM_URLENCODED +from .. import SIGNATURE_HMAC, SIGNATURE_RSA +from .. import SIGNATURE_TYPE_AUTH_HEADER +from .. import SIGNATURE_TYPE_QUERY +from .. import SIGNATURE_TYPE_BODY + + +class BaseEndpoint(object): + + def __init__(self, request_validator, token_generator=None): + self.request_validator = request_validator + self.token_generator = token_generator or generate_token + + def _get_signature_type_and_params(self, request): + """Extracts parameters from query, headers and body. Signature type + is set to the source in which parameters were found. + """ + # Per RFC5849, only the Authorization header may contain the 'realm' + # optional parameter. + header_params = signature.collect_parameters(headers=request.headers, + exclude_oauth_signature=False, with_realm=True) + body_params = signature.collect_parameters(body=request.body, + exclude_oauth_signature=False) + query_params = signature.collect_parameters(uri_query=request.uri_query, + exclude_oauth_signature=False) + + params = [] + params.extend(header_params) + params.extend(body_params) + params.extend(query_params) + signature_types_with_oauth_params = list(filter(lambda s: s[2], ( + (SIGNATURE_TYPE_AUTH_HEADER, params, + utils.filter_oauth_params(header_params)), + (SIGNATURE_TYPE_BODY, params, + utils.filter_oauth_params(body_params)), + (SIGNATURE_TYPE_QUERY, params, + utils.filter_oauth_params(query_params)) + ))) + + if len(signature_types_with_oauth_params) > 1: + found_types = [s[0] for s in signature_types_with_oauth_params] + raise errors.InvalidRequestError( + description=('oauth_ params must come from only 1 signature' + 'type but were found in %s', + ', '.join(found_types))) + + try: + signature_type, params, oauth_params = signature_types_with_oauth_params[ + 0] + except IndexError: + raise errors.InvalidRequestError( + description='Missing mandatory OAuth parameters.') + + return signature_type, params, oauth_params + + def _create_request(self, uri, http_method, body, headers): + # Only include body data from x-www-form-urlencoded requests + headers = headers or {} + if ("Content-Type" in headers and + CONTENT_TYPE_FORM_URLENCODED in headers["Content-Type"]): + request = Request(uri, http_method, body, headers) + else: + request = Request(uri, http_method, '', headers) + + signature_type, params, oauth_params = ( + self._get_signature_type_and_params(request)) + + # The server SHOULD return a 400 (Bad Request) status code when + # receiving a request with duplicated protocol parameters. + if len(dict(oauth_params)) != len(oauth_params): + raise errors.InvalidRequestError( + description='Duplicate OAuth2 entries.') + + oauth_params = dict(oauth_params) + request.signature = oauth_params.get('oauth_signature') + request.client_key = oauth_params.get('oauth_consumer_key') + request.resource_owner_key = oauth_params.get('oauth_token') + request.nonce = oauth_params.get('oauth_nonce') + request.timestamp = oauth_params.get('oauth_timestamp') + request.redirect_uri = oauth_params.get('oauth_callback') + request.verifier = oauth_params.get('oauth_verifier') + request.signature_method = oauth_params.get('oauth_signature_method') + request.realm = dict(params).get('realm') + request.oauth_params = oauth_params + + # Parameters to Client depend on signature method which may vary + # for each request. Note that HMAC-SHA1 and PLAINTEXT share parameters + request.params = [(k, v) for k, v in params if k != "oauth_signature"] + + if 'realm' in request.headers.get('Authorization', ''): + request.params = [(k, v) + for k, v in request.params if k != "realm"] + + return request + + def _check_transport_security(self, request): + # TODO: move into oauthlib.common from oauth2.utils + if (self.request_validator.enforce_ssl and + not request.uri.lower().startswith("https://")): + raise errors.InsecureTransportError() + + def _check_mandatory_parameters(self, request): + # The server SHOULD return a 400 (Bad Request) status code when + # receiving a request with missing parameters. + if not all((request.signature, request.client_key, + request.nonce, request.timestamp, + request.signature_method)): + raise errors.InvalidRequestError( + description='Missing mandatory OAuth parameters.') + + # OAuth does not mandate a particular signature method, as each + # implementation can have its own unique requirements. Servers are + # free to implement and document their own custom methods. + # Recommending any particular method is beyond the scope of this + # specification. Implementers should review the Security + # Considerations section (`Section 4`_) before deciding on which + # method to support. + # .. _`Section 4`: http://tools.ietf.org/html/rfc5849#section-4 + if (not request.signature_method in + self.request_validator.allowed_signature_methods): + raise errors.InvalidSignatureMethodError( + description="Invalid signature, %s not in %r." % ( + request.signature_method, + self.request_validator.allowed_signature_methods)) + + # Servers receiving an authenticated request MUST validate it by: + # If the "oauth_version" parameter is present, ensuring its value is + # "1.0". + if ('oauth_version' in request.oauth_params and + request.oauth_params['oauth_version'] != '1.0'): + raise errors.InvalidRequestError( + description='Invalid OAuth version.') + + # The timestamp value MUST be a positive integer. Unless otherwise + # specified by the server's documentation, the timestamp is expressed + # in the number of seconds since January 1, 1970 00:00:00 GMT. + if len(request.timestamp) != 10: + raise errors.InvalidRequestError( + description='Invalid timestamp size') + + try: + ts = int(request.timestamp) + + except ValueError: + raise errors.InvalidRequestError( + description='Timestamp must be an integer.') + + else: + # To avoid the need to retain an infinite number of nonce values for + # future checks, servers MAY choose to restrict the time period after + # which a request with an old timestamp is rejected. + if abs(time.time() - ts) > self.request_validator.timestamp_lifetime: + raise errors.InvalidRequestError( + description=('Timestamp given is invalid, differ from ' + 'allowed by over %s seconds.' % ( + self.request_validator.timestamp_lifetime))) + + # Provider specific validation of parameters, used to enforce + # restrictions such as character set and length. + if not self.request_validator.check_client_key(request.client_key): + raise errors.InvalidRequestError( + description='Invalid client key format.') + + if not self.request_validator.check_nonce(request.nonce): + raise errors.InvalidRequestError( + description='Invalid nonce format.') + + def _check_signature(self, request, is_token_request=False): + # ---- RSA Signature verification ---- + if request.signature_method == SIGNATURE_RSA: + # The server verifies the signature per `[RFC3447] section 8.2.2`_ + # .. _`[RFC3447] section 8.2.2`: http://tools.ietf.org/html/rfc3447#section-8.2.1 + rsa_key = self.request_validator.get_rsa_key( + request.client_key, request) + valid_signature = signature.verify_rsa_sha1(request, rsa_key) + + # ---- HMAC or Plaintext Signature verification ---- + else: + # Servers receiving an authenticated request MUST validate it by: + # Recalculating the request signature independently as described in + # `Section 3.4`_ and comparing it to the value received from the + # client via the "oauth_signature" parameter. + # .. _`Section 3.4`: http://tools.ietf.org/html/rfc5849#section-3.4 + client_secret = self.request_validator.get_client_secret( + request.client_key, request) + resource_owner_secret = None + if request.resource_owner_key: + if is_token_request: + resource_owner_secret = self.request_validator.get_request_token_secret( + request.client_key, request.resource_owner_key, request) + else: + resource_owner_secret = self.request_validator.get_access_token_secret( + request.client_key, request.resource_owner_key, request) + + if request.signature_method == SIGNATURE_HMAC: + valid_signature = signature.verify_hmac_sha1(request, + client_secret, resource_owner_secret) + else: + valid_signature = signature.verify_plaintext(request, + client_secret, resource_owner_secret) + return valid_signature diff --git a/oauthlib/oauth1/rfc5849/endpoints/pre_configured.py b/oauthlib/oauth1/rfc5849/endpoints/pre_configured.py new file mode 100644 index 0000000..f0705a8 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/pre_configured.py @@ -0,0 +1,14 @@ +from __future__ import absolute_import, unicode_literals + +from . import RequestTokenEndpoint, AuthorizationEndpoint +from . import AccessTokenEndpoint, ResourceEndpoint + + +class WebApplicationServer(RequestTokenEndpoint, AuthorizationEndpoint, + AccessTokenEndpoint, ResourceEndpoint): + + def __init__(self, request_validator): + RequestTokenEndpoint.__init__(self, request_validator) + AuthorizationEndpoint.__init__(self, request_validator) + AccessTokenEndpoint.__init__(self, request_validator) + ResourceEndpoint.__init__(self, request_validator) diff --git a/oauthlib/oauth1/rfc5849/endpoints/request_token.py b/oauthlib/oauth1/rfc5849/endpoints/request_token.py new file mode 100644 index 0000000..e97c34b --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/request_token.py @@ -0,0 +1,202 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.endpoints.request_token +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of the request token provider logic of +OAuth 1.0 RFC 5849. It validates the correctness of request token requests, +creates and persists tokens as well as create the proper response to be +returned to the client. +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from oauthlib.common import urlencode + +from .base import BaseEndpoint +from .. import errors + +log = logging.getLogger(__name__) + + +class RequestTokenEndpoint(BaseEndpoint): + + """An endpoint responsible for providing OAuth 1 request tokens. + + Typical use is to instantiate with a request validator and invoke the + ``create_request_token_response`` from a view function. The tuple returned + has all information necessary (body, status, headers) to quickly form + and return a proper response. See :doc:`/oauth1/validator` for details on which + validator methods to implement for this endpoint. + """ + + def create_request_token(self, request, credentials): + """Create and save a new request token. + + :param request: An oauthlib.common.Request object. + :param credentials: A dict of extra token credentials. + :returns: The token as an urlencoded string. + """ + token = { + 'oauth_token': self.token_generator(), + 'oauth_token_secret': self.token_generator(), + 'oauth_callback_confirmed': 'true' + } + token.update(credentials) + self.request_validator.save_request_token(token, request) + return urlencode(token.items()) + + def create_request_token_response(self, uri, http_method='GET', body=None, + headers=None, credentials=None): + """Create a request token response, with a new request token if valid. + + :param uri: The full URI of the token request. + :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. + :param body: The request body as a string. + :param headers: The request headers as a dict. + :param credentials: A list of extra credentials to include in the token. + :returns: A tuple of 3 elements. + 1. A dict of headers to set on the response. + 2. The response body as a string. + 3. The response status code as an integer. + + An example of a valid request:: + + >>> from your_validator import your_validator + >>> from oauthlib.oauth1 import RequestTokenEndpoint + >>> endpoint = RequestTokenEndpoint(your_validator) + >>> h, b, s = endpoint.create_request_token_response( + ... 'https://your.provider/request_token?foo=bar', + ... headers={ + ... 'Authorization': 'OAuth realm=movies user, oauth_....' + ... }, + ... credentials={ + ... 'my_specific': 'argument', + ... }) + >>> h + {'Content-Type': 'application/x-www-form-urlencoded'} + >>> b + 'oauth_token=lsdkfol23w54jlksdef&oauth_token_secret=qwe089234lkjsdf&oauth_callback_confirmed=true&my_specific=argument' + >>> s + 200 + + An response to invalid request would have a different body and status:: + + >>> b + 'error=invalid_request&description=missing+callback+uri' + >>> s + 400 + + The same goes for an an unauthorized request: + + >>> b + '' + >>> s + 401 + """ + resp_headers = {'Content-Type': 'application/x-www-form-urlencoded'} + try: + request = self._create_request(uri, http_method, body, headers) + valid, processed_request = self.validate_request_token_request( + request) + if valid: + token = self.create_request_token(request, credentials or {}) + return resp_headers, token, 200 + else: + return {}, None, 401 + except errors.OAuth1Error as e: + return resp_headers, e.urlencoded, e.status_code + + def validate_request_token_request(self, request): + """Validate a request token request. + + :param request: An oauthlib.common.Request object. + :raises: OAuth1Error if the request is invalid. + :returns: A tuple of 2 elements. + 1. The validation result (True or False). + 2. The request object. + """ + self._check_transport_security(request) + self._check_mandatory_parameters(request) + + if request.realm: + request.realms = request.realm.split(' ') + else: + request.realms = self.request_validator.get_default_realms( + request.client_key, request) + if not self.request_validator.check_realms(request.realms): + raise errors.InvalidRequestError( + description='Invalid realm %s. Allowed are %r.' % ( + request.realms, self.request_validator.realms)) + + if not request.redirect_uri: + raise errors.InvalidRequestError( + description='Missing callback URI.') + + if not self.request_validator.validate_timestamp_and_nonce( + request.client_key, request.timestamp, request.nonce, request, + request_token=request.resource_owner_key): + return False, request + + # The server SHOULD return a 401 (Unauthorized) status code when + # receiving a request with invalid client credentials. + # Note: This is postponed in order to avoid timing attacks, instead + # a dummy client is assigned and used to maintain near constant + # time request verification. + # + # Note that early exit would enable client enumeration + valid_client = self.request_validator.validate_client_key( + request.client_key, request) + if not valid_client: + request.client_key = self.request_validator.dummy_client + + # Note that `realm`_ is only used in authorization headers and how + # it should be interepreted is not included in the OAuth spec. + # However they could be seen as a scope or realm to which the + # client has access and as such every client should be checked + # to ensure it is authorized access to that scope or realm. + # .. _`realm`: http://tools.ietf.org/html/rfc2617#section-1.2 + # + # Note that early exit would enable client realm access enumeration. + # + # The require_realm indicates this is the first step in the OAuth + # workflow where a client requests access to a specific realm. + # This first step (obtaining request token) need not require a realm + # and can then be identified by checking the require_resource_owner + # flag and abscence of realm. + # + # Clients obtaining an access token will not supply a realm and it will + # not be checked. Instead the previously requested realm should be + # transferred from the request token to the access token. + # + # Access to protected resources will always validate the realm but note + # that the realm is now tied to the access token and not provided by + # the client. + valid_realm = self.request_validator.validate_requested_realms( + request.client_key, request.realms, request) + + # Callback is normally never required, except for requests for + # a Temporary Credential as described in `Section 2.1`_ + # .._`Section 2.1`: http://tools.ietf.org/html/rfc5849#section-2.1 + valid_redirect = self.request_validator.validate_redirect_uri( + request.client_key, request.redirect_uri, request) + if not request.redirect_uri: + raise NotImplementedError('Redirect URI must either be provided ' + 'or set to a default during validation.') + + valid_signature = self._check_signature(request) + + # We delay checking validity until the very end, using dummy values for + # calculations and fetching secrets/keys to ensure the flow of every + # request remains almost identical regardless of whether valid values + # have been supplied. This ensures near constant time execution and + # prevents malicious users from guessing sensitive information + v = all((valid_client, valid_realm, valid_redirect, valid_signature)) + if not v: + log.info("[Failure] request verification failed.") + log.info("Valid client: %s.", valid_client) + log.info("Valid realm: %s.", valid_realm) + log.info("Valid callback: %s.", valid_redirect) + log.info("Valid signature: %s.", valid_signature) + return v, request diff --git a/oauthlib/oauth1/rfc5849/endpoints/resource.py b/oauthlib/oauth1/rfc5849/endpoints/resource.py new file mode 100644 index 0000000..651a87c --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/resource.py @@ -0,0 +1,158 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.endpoints.resource +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of the resource protection provider logic of +OAuth 1.0 RFC 5849. +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from .base import BaseEndpoint +from .. import errors + +log = logging.getLogger(__name__) + + +class ResourceEndpoint(BaseEndpoint): + + """An endpoint responsible for protecting resources. + + Typical use is to instantiate with a request validator and invoke the + ``validate_protected_resource_request`` in a decorator around a view + function. If the request is valid, invoke and return the response of the + view. If invalid create and return an error response directly from the + decorator. + + See :doc:`/oauth1/validator` for details on which validator methods to implement + for this endpoint. + + An example decorator:: + + from functools import wraps + from your_validator import your_validator + from oauthlib.oauth1 import ResourceEndpoint + endpoint = ResourceEndpoint(your_validator) + + def require_oauth(realms=None): + def decorator(f): + @wraps(f) + def wrapper(request, *args, **kwargs): + v, r = provider.validate_protected_resource_request( + request.url, + http_method=request.method, + body=request.data, + headers=request.headers, + realms=realms or []) + if v: + return f(*args, **kwargs) + else: + return abort(403) + """ + + def validate_protected_resource_request(self, uri, http_method='GET', + body=None, headers=None, realms=None): + """Create a request token response, with a new request token if valid. + + :param uri: The full URI of the token request. + :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. + :param body: The request body as a string. + :param headers: The request headers as a dict. + :param realms: A list of realms the resource is protected under. + This will be supplied to the ``validate_realms`` + method of the request validator. + :returns: A tuple of 2 elements. + 1. True if valid, False otherwise. + 2. An oauthlib.common.Request object. + """ + try: + request = self._create_request(uri, http_method, body, headers) + except errors.OAuth1Error: + return False, None + + try: + self._check_transport_security(request) + self._check_mandatory_parameters(request) + except errors.OAuth1Error: + return False, request + + if not request.resource_owner_key: + return False, request + + if not self.request_validator.check_access_token( + request.resource_owner_key): + return False, request + + if not self.request_validator.validate_timestamp_and_nonce( + request.client_key, request.timestamp, request.nonce, request, + access_token=request.resource_owner_key): + return False, request + + # The server SHOULD return a 401 (Unauthorized) status code when + # receiving a request with invalid client credentials. + # Note: This is postponed in order to avoid timing attacks, instead + # a dummy client is assigned and used to maintain near constant + # time request verification. + # + # Note that early exit would enable client enumeration + valid_client = self.request_validator.validate_client_key( + request.client_key, request) + if not valid_client: + request.client_key = self.request_validator.dummy_client + + # The server SHOULD return a 401 (Unauthorized) status code when + # receiving a request with invalid or expired token. + # Note: This is postponed in order to avoid timing attacks, instead + # a dummy token is assigned and used to maintain near constant + # time request verification. + # + # Note that early exit would enable resource owner enumeration + valid_resource_owner = self.request_validator.validate_access_token( + request.client_key, request.resource_owner_key, request) + if not valid_resource_owner: + request.resource_owner_key = self.request_validator.dummy_access_token + + # Note that `realm`_ is only used in authorization headers and how + # it should be interepreted is not included in the OAuth spec. + # However they could be seen as a scope or realm to which the + # client has access and as such every client should be checked + # to ensure it is authorized access to that scope or realm. + # .. _`realm`: http://tools.ietf.org/html/rfc2617#section-1.2 + # + # Note that early exit would enable client realm access enumeration. + # + # The require_realm indicates this is the first step in the OAuth + # workflow where a client requests access to a specific realm. + # This first step (obtaining request token) need not require a realm + # and can then be identified by checking the require_resource_owner + # flag and abscence of realm. + # + # Clients obtaining an access token will not supply a realm and it will + # not be checked. Instead the previously requested realm should be + # transferred from the request token to the access token. + # + # Access to protected resources will always validate the realm but note + # that the realm is now tied to the access token and not provided by + # the client. + valid_realm = self.request_validator.validate_realms(request.client_key, + request.resource_owner_key, request, uri=request.uri, + realms=realms) + + valid_signature = self._check_signature(request) + + # We delay checking validity until the very end, using dummy values for + # calculations and fetching secrets/keys to ensure the flow of every + # request remains almost identical regardless of whether valid values + # have been supplied. This ensures near constant time execution and + # prevents malicious users from guessing sensitive information + v = all((valid_client, valid_resource_owner, valid_realm, + valid_signature)) + if not v: + log.info("[Failure] request verification failed.") + log.info("Valid client: %s", valid_client) + log.info("Valid token: %s", valid_resource_owner) + log.info("Valid realm: %s", valid_realm) + log.info("Valid signature: %s", valid_signature) + return v, request diff --git a/oauthlib/oauth1/rfc5849/endpoints/signature_only.py b/oauthlib/oauth1/rfc5849/endpoints/signature_only.py new file mode 100644 index 0000000..2f8e7c9 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/endpoints/signature_only.py @@ -0,0 +1,74 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.endpoints.signature_only +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of the signing logic of OAuth 1.0 RFC 5849. +""" + +from __future__ import absolute_import, unicode_literals + +import logging + +from .base import BaseEndpoint +from .. import errors + +log = logging.getLogger(__name__) + + +class SignatureOnlyEndpoint(BaseEndpoint): + + """An endpoint only responsible for verifying an oauth signature.""" + + def validate_request(self, uri, http_method='GET', + body=None, headers=None): + """Validate a signed OAuth request. + + :param uri: The full URI of the token request. + :param http_method: A valid HTTP verb, i.e. GET, POST, PUT, HEAD, etc. + :param body: The request body as a string. + :param headers: The request headers as a dict. + :returns: A tuple of 2 elements. + 1. True if valid, False otherwise. + 2. An oauthlib.common.Request object. + """ + try: + request = self._create_request(uri, http_method, body, headers) + except errors.OAuth1Error: + return False, None + + try: + self._check_transport_security(request) + self._check_mandatory_parameters(request) + except errors.OAuth1Error: + return False, request + + if not self.request_validator.validate_timestamp_and_nonce( + request.client_key, request.timestamp, request.nonce, request): + return False, request + + # The server SHOULD return a 401 (Unauthorized) status code when + # receiving a request with invalid client credentials. + # Note: This is postponed in order to avoid timing attacks, instead + # a dummy client is assigned and used to maintain near constant + # time request verification. + # + # Note that early exit would enable client enumeration + valid_client = self.request_validator.validate_client_key( + request.client_key, request) + if not valid_client: + request.client_key = self.request_validator.dummy_client + + valid_signature = self._check_signature(request) + + # We delay checking validity until the very end, using dummy values for + # calculations and fetching secrets/keys to ensure the flow of every + # request remains almost identical regardless of whether valid values + # have been supplied. This ensures near constant time execution and + # prevents malicious users from guessing sensitive information + v = all((valid_client, valid_signature)) + if not v: + log.info("[Failure] request verification failed.") + log.info("Valid client: %s", valid_client) + log.info("Valid signature: %s", valid_signature) + return v, request diff --git a/oauthlib/oauth1/rfc5849/errors.py b/oauthlib/oauth1/rfc5849/errors.py new file mode 100644 index 0000000..978035e --- /dev/null +++ b/oauthlib/oauth1/rfc5849/errors.py @@ -0,0 +1,79 @@ +# coding=utf-8 +""" +oauthlib.oauth1.rfc5849.errors +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Error used both by OAuth 1 clients and provicers to represent the spec +defined error responses for all four core grant types. +""" +from __future__ import unicode_literals + +from oauthlib.common import urlencode, add_params_to_uri + + +class OAuth1Error(Exception): + error = None + description = '' + + def __init__(self, description=None, uri=None, status_code=400, + request=None): + """ + description: A human-readable ASCII [USASCII] text providing + additional information, used to assist the client + developer in understanding the error that occurred. + Values for the "error_description" parameter MUST NOT + include characters outside the set + x20-21 / x23-5B / x5D-7E. + + uri: A URI identifying a human-readable web page with information + about the error, used to provide the client developer with + additional information about the error. Values for the + "error_uri" parameter MUST conform to the URI- Reference + syntax, and thus MUST NOT include characters outside the set + x21 / x23-5B / x5D-7E. + + state: A CSRF protection value received from the client. + + request: Oauthlib Request object + """ + self.description = description or self.description + message = '(%s) %s' % (self.error, self.description) + if request: + message += ' ' + repr(request) + super(OAuth1Error, self).__init__(message) + + self.uri = uri + self.status_code = status_code + + def in_uri(self, uri): + return add_params_to_uri(uri, self.twotuples) + + @property + def twotuples(self): + error = [('error', self.error)] + if self.description: + error.append(('error_description', self.description)) + if self.uri: + error.append(('error_uri', self.uri)) + return error + + @property + def urlencoded(self): + return urlencode(self.twotuples) + + +class InsecureTransportError(OAuth1Error): + error = 'insecure_transport_protocol' + description = 'Only HTTPS connections are permitted.' + + +class InvalidSignatureMethodError(OAuth1Error): + error = 'invalid_signature_method' + + +class InvalidRequestError(OAuth1Error): + error = 'invalid_request' + + +class InvalidClientError(OAuth1Error): + error = 'invalid_client' diff --git a/oauthlib/oauth1/rfc5849/parameters.py b/oauthlib/oauth1/rfc5849/parameters.py new file mode 100644 index 0000000..f0963ab --- /dev/null +++ b/oauthlib/oauth1/rfc5849/parameters.py @@ -0,0 +1,137 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.parameters +~~~~~~~~~~~~~~~~~~~ + +This module contains methods related to `section 3.5`_ of the OAuth 1.0a spec. + +.. _`section 3.5`: http://tools.ietf.org/html/rfc5849#section-3.5 +""" +from __future__ import absolute_import, unicode_literals + +try: + from urlparse import urlparse, urlunparse +except ImportError: + from urllib.parse import urlparse, urlunparse +from . import utils +from oauthlib.common import extract_params, urlencode + + +# TODO: do we need filter_params now that oauth_params are handled by Request? +# We can easily pass in just oauth protocol params. +@utils.filter_params +def prepare_headers(oauth_params, headers=None, realm=None): + """**Prepare the Authorization header.** + Per `section 3.5.1`_ of the spec. + + Protocol parameters can be transmitted using the HTTP "Authorization" + header field as defined by `RFC2617`_ with the auth-scheme name set to + "OAuth" (case insensitive). + + For example:: + + Authorization: OAuth realm="Example", + oauth_consumer_key="0685bd9184jfhq22", + oauth_token="ad180jjd733klru7", + oauth_signature_method="HMAC-SHA1", + oauth_signature="wOJIO9A2W5mFwDgiDvZbTSMK%2FPY%3D", + oauth_timestamp="137131200", + oauth_nonce="4572616e48616d6d65724c61686176", + oauth_version="1.0" + + + .. _`section 3.5.1`: http://tools.ietf.org/html/rfc5849#section-3.5.1 + .. _`RFC2617`: http://tools.ietf.org/html/rfc2617 + """ + headers = headers or {} + + # Protocol parameters SHALL be included in the "Authorization" header + # field as follows: + authorization_header_parameters_parts = [] + for oauth_parameter_name, value in oauth_params: + # 1. Parameter names and values are encoded per Parameter Encoding + # (`Section 3.6`_) + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + escaped_name = utils.escape(oauth_parameter_name) + escaped_value = utils.escape(value) + + # 2. Each parameter's name is immediately followed by an "=" character + # (ASCII code 61), a """ character (ASCII code 34), the parameter + # value (MAY be empty), and another """ character (ASCII code 34). + part = '{0}="{1}"'.format(escaped_name, escaped_value) + + authorization_header_parameters_parts.append(part) + + # 3. Parameters are separated by a "," character (ASCII code 44) and + # OPTIONAL linear whitespace per `RFC2617`_. + # + # .. _`RFC2617`: http://tools.ietf.org/html/rfc2617 + authorization_header_parameters = ', '.join( + authorization_header_parameters_parts) + + # 4. The OPTIONAL "realm" parameter MAY be added and interpreted per + # `RFC2617 section 1.2`_. + # + # .. _`RFC2617 section 1.2`: http://tools.ietf.org/html/rfc2617#section-1.2 + if realm: + # NOTE: realm should *not* be escaped + authorization_header_parameters = ('realm="%s", ' % realm + + authorization_header_parameters) + + # the auth-scheme name set to "OAuth" (case insensitive). + authorization_header = 'OAuth %s' % authorization_header_parameters + + # contribute the Authorization header to the given headers + full_headers = {} + full_headers.update(headers) + full_headers['Authorization'] = authorization_header + return full_headers + + +def _append_params(oauth_params, params): + """Append OAuth params to an existing set of parameters. + + Both params and oauth_params is must be lists of 2-tuples. + + Per `section 3.5.2`_ and `3.5.3`_ of the spec. + + .. _`section 3.5.2`: http://tools.ietf.org/html/rfc5849#section-3.5.2 + .. _`3.5.3`: http://tools.ietf.org/html/rfc5849#section-3.5.3 + + """ + merged = list(params) + merged.extend(oauth_params) + # The request URI / entity-body MAY include other request-specific + # parameters, in which case, the protocol parameters SHOULD be appended + # following the request-specific parameters, properly separated by an "&" + # character (ASCII code 38) + merged.sort(key=lambda i: i[0].startswith('oauth_')) + return merged + + +def prepare_form_encoded_body(oauth_params, body): + """Prepare the Form-Encoded Body. + + Per `section 3.5.2`_ of the spec. + + .. _`section 3.5.2`: http://tools.ietf.org/html/rfc5849#section-3.5.2 + + """ + # append OAuth params to the existing body + return _append_params(oauth_params, body) + + +def prepare_request_uri_query(oauth_params, uri): + """Prepare the Request URI Query. + + Per `section 3.5.3`_ of the spec. + + .. _`section 3.5.3`: http://tools.ietf.org/html/rfc5849#section-3.5.3 + + """ + # append OAuth params to the existing set of query components + sch, net, path, par, query, fra = urlparse(uri) + query = urlencode( + _append_params(oauth_params, extract_params(query) or [])) + return urlunparse((sch, net, path, par, query, fra)) diff --git a/oauthlib/oauth1/rfc5849/request_validator.py b/oauthlib/oauth1/rfc5849/request_validator.py new file mode 100644 index 0000000..e722029 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/request_validator.py @@ -0,0 +1,823 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849 +~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for signing and checking OAuth 1.0 RFC 5849 requests. +""" +from __future__ import absolute_import, unicode_literals + +from . import SIGNATURE_METHODS, utils + + +class RequestValidator(object): + + """A validator/datastore interaction base class for OAuth 1 providers. + + OAuth providers should inherit from RequestValidator and implement the + methods and properties outlined below. Further details are provided in the + documentation for each method and property. + + Methods used to check the format of input parameters. Common tests include + length, character set, membership, range or pattern. These tests are + referred to as `whitelisting or blacklisting`_. Whitelisting is better + but blacklisting can be usefull to spot malicious activity. + The following have methods a default implementation: + + - check_client_key + - check_request_token + - check_access_token + - check_nonce + - check_verifier + - check_realms + + The methods above default to whitelist input parameters, checking that they + are alphanumerical and between a minimum and maximum length. Rather than + overloading the methods a few properties can be used to configure these + methods. + + * @safe_characters -> (character set) + * @client_key_length -> (min, max) + * @request_token_length -> (min, max) + * @access_token_length -> (min, max) + * @nonce_length -> (min, max) + * @verifier_length -> (min, max) + * @realms -> [list, of, realms] + + Methods used to validate/invalidate input parameters. These checks usually + hit either persistent or temporary storage such as databases or the + filesystem. See each methods documentation for detailed usage. + The following methods must be implemented: + + - validate_client_key + - validate_request_token + - validate_access_token + - validate_timestamp_and_nonce + - validate_redirect_uri + - validate_requested_realms + - validate_realms + - validate_verifier + - invalidate_request_token + + Methods used to retrieve sensitive information from storage. + The following methods must be implemented: + + - get_client_secret + - get_request_token_secret + - get_access_token_secret + - get_rsa_key + - get_realms + - get_default_realms + - get_redirect_uri + + Methods used to save credentials. + The following methods must be implemented: + + - save_request_token + - save_verifier + - save_access_token + + Methods used to verify input parameters. This methods are used during + authorizing request token by user (AuthorizationEndpoint), to check if + parameters are valid. During token authorization request is not signed, + thus 'validation' methods can not be used. The following methods must be + implemented: + + - verify_realms + - verify_request_token + + To prevent timing attacks it is necessary to not exit early even if the + client key or resource owner key is invalid. Instead dummy values should + be used during the remaining verification process. It is very important + that the dummy client and token are valid input parameters to the methods + get_client_secret, get_rsa_key and get_(access/request)_token_secret and + that the running time of those methods when given a dummy value remain + equivalent to the running time when given a valid client/resource owner. + The following properties must be implemented: + + * @dummy_client + * @dummy_request_token + * @dummy_access_token + + Example implementations have been provided, note that the database used is + a simple dictionary and serves only an illustrative purpose. Use whichever + database suits your project and how to access it is entirely up to you. + The methods are introduced in an order which should make understanding + their use more straightforward and as such it could be worth reading what + follows in chronological order. + + .. _`whitelisting or blacklisting`: http://www.schneier.com/blog/archives/2011/01/whitelisting_vs.html + """ + + def __init__(self): + pass + + @property + def allowed_signature_methods(self): + return SIGNATURE_METHODS + + @property + def safe_characters(self): + return set(utils.UNICODE_ASCII_CHARACTER_SET) + + @property + def client_key_length(self): + return 20, 30 + + @property + def request_token_length(self): + return 20, 30 + + @property + def access_token_length(self): + return 20, 30 + + @property + def timestamp_lifetime(self): + return 600 + + @property + def nonce_length(self): + return 20, 30 + + @property + def verifier_length(self): + return 20, 30 + + @property + def realms(self): + return [] + + @property + def enforce_ssl(self): + return True + + def check_client_key(self, client_key): + """Check that the client key only contains safe characters + and is no shorter than lower and no longer than upper. + """ + lower, upper = self.client_key_length + return (set(client_key) <= self.safe_characters and + lower <= len(client_key) <= upper) + + def check_request_token(self, request_token): + """Checks that the request token contains only safe characters + and is no shorter than lower and no longer than upper. + """ + lower, upper = self.request_token_length + return (set(request_token) <= self.safe_characters and + lower <= len(request_token) <= upper) + + def check_access_token(self, request_token): + """Checks that the token contains only safe characters + and is no shorter than lower and no longer than upper. + """ + lower, upper = self.access_token_length + return (set(request_token) <= self.safe_characters and + lower <= len(request_token) <= upper) + + def check_nonce(self, nonce): + """Checks that the nonce only contains only safe characters + and is no shorter than lower and no longer than upper. + """ + lower, upper = self.nonce_length + return (set(nonce) <= self.safe_characters and + lower <= len(nonce) <= upper) + + def check_verifier(self, verifier): + """Checks that the verifier contains only safe characters + and is no shorter than lower and no longer than upper. + """ + lower, upper = self.verifier_length + return (set(verifier) <= self.safe_characters and + lower <= len(verifier) <= upper) + + def check_realms(self, realms): + """Check that the realm is one of a set allowed realms.""" + return all((r in self.realms for r in realms)) + + @property + def dummy_client(self): + """Dummy client used when an invalid client key is supplied. + + :returns: The dummy client key string. + + The dummy client should be associated with either a client secret, + a rsa key or both depending on which signature methods are supported. + Providers should make sure that + + get_client_secret(dummy_client) + get_rsa_key(dummy_client) + + return a valid secret or key for the dummy client. + + This method is used by + + * AccessTokenEndpoint + * RequestTokenEndpoint + * ResourceEndpoint + * SignatureOnlyEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + @property + def dummy_request_token(self): + """Dummy request token used when an invalid token was supplied. + + :returns: The dummy request token string. + + The dummy request token should be associated with a request token + secret such that get_request_token_secret(.., dummy_request_token) + returns a valid secret. + + This method is used by + + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + @property + def dummy_access_token(self): + """Dummy access token used when an invalid token was supplied. + + :returns: The dummy access token string. + + The dummy access token should be associated with an access token + secret such that get_access_token_secret(.., dummy_access_token) + returns a valid secret. + + This method is used by + + * ResourceEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_client_secret(self, client_key, request): + """Retrieves the client secret associated with the client key. + + :param client_key: The client/consumer key. + :param request: An oauthlib.common.Request object. + :returns: The client secret as a string. + + This method must allow the use of a dummy client_key value. + Fetching the secret using the dummy key must take the same amount of + time as fetching a secret for a valid client:: + + # Unlikely to be near constant time as it uses two database + # lookups for a valid client, and only one for an invalid. + from your_datastore import ClientSecret + if ClientSecret.has(client_key): + return ClientSecret.get(client_key) + else: + return 'dummy' + + # Aim to mimic number of latency inducing operations no matter + # whether the client is valid or not. + from your_datastore import ClientSecret + return ClientSecret.get(client_key, 'dummy') + + Note that the returned key must be in plaintext. + + This method is used by + + * AccessTokenEndpoint + * RequestTokenEndpoint + * ResourceEndpoint + * SignatureOnlyEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_request_token_secret(self, client_key, token, request): + """Retrieves the shared secret associated with the request token. + + :param client_key: The client/consumer key. + :param token: The request token string. + :param request: An oauthlib.common.Request object. + :returns: The token secret as a string. + + This method must allow the use of a dummy values and the running time + must be roughly equivalent to that of the running time of valid values:: + + # Unlikely to be near constant time as it uses two database + # lookups for a valid client, and only one for an invalid. + from your_datastore import RequestTokenSecret + if RequestTokenSecret.has(client_key): + return RequestTokenSecret.get((client_key, request_token)) + else: + return 'dummy' + + # Aim to mimic number of latency inducing operations no matter + # whether the client is valid or not. + from your_datastore import RequestTokenSecret + return ClientSecret.get((client_key, request_token), 'dummy') + + Note that the returned key must be in plaintext. + + This method is used by + + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_access_token_secret(self, client_key, token, request): + """Retrieves the shared secret associated with the access token. + + :param client_key: The client/consumer key. + :param token: The access token string. + :param request: An oauthlib.common.Request object. + :returns: The token secret as a string. + + This method must allow the use of a dummy values and the running time + must be roughly equivalent to that of the running time of valid values:: + + # Unlikely to be near constant time as it uses two database + # lookups for a valid client, and only one for an invalid. + from your_datastore import AccessTokenSecret + if AccessTokenSecret.has(client_key): + return AccessTokenSecret.get((client_key, request_token)) + else: + return 'dummy' + + # Aim to mimic number of latency inducing operations no matter + # whether the client is valid or not. + from your_datastore import AccessTokenSecret + return ClientSecret.get((client_key, request_token), 'dummy') + + Note that the returned key must be in plaintext. + + This method is used by + + * ResourceEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_default_realms(self, client_key, request): + """Get the default realms for a client. + + :param client_key: The client/consumer key. + :param request: An oauthlib.common.Request object. + :returns: The list of default realms associated with the client. + + The list of default realms will be set during client registration and + is outside the scope of OAuthLib. + + This method is used by + + * RequestTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_realms(self, token, request): + """Get realms associated with a request token. + + :param token: The request token string. + :param request: An oauthlib.common.Request object. + :returns: The list of realms associated with the request token. + + This method is used by + + * AuthorizationEndpoint + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_redirect_uri(self, token, request): + """Get the redirect URI associated with a request token. + + :param token: The request token string. + :param request: An oauthlib.common.Request object. + :returns: The redirect URI associated with the request token. + + It may be desirable to return a custom URI if the redirect is set to "oob". + In this case, the user will be redirected to the returned URI and at that + endpoint the verifier can be displayed. + + This method is used by + + * AuthorizationEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def get_rsa_key(self, client_key, request): + """Retrieves a previously stored client provided RSA key. + + :param client_key: The client/consumer key. + :param request: An oauthlib.common.Request object. + :returns: The rsa public key as a string. + + This method must allow the use of a dummy client_key value. Fetching + the rsa key using the dummy key must take the same amount of time + as fetching a key for a valid client. The dummy key must also be of + the same bit length as client keys. + + Note that the key must be returned in plaintext. + + This method is used by + + * AccessTokenEndpoint + * RequestTokenEndpoint + * ResourceEndpoint + * SignatureOnlyEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def invalidate_request_token(self, client_key, request_token, request): + """Invalidates a used request token. + + :param client_key: The client/consumer key. + :param request_token: The request token string. + :param request: An oauthlib.common.Request object. + :returns: The rsa public key as a string. + + Per `Section 2.3`__ of the spec: + + "The server MUST (...) ensure that the temporary + credentials have not expired or been used before." + + .. _`Section 2.3`: http://tools.ietf.org/html/rfc5849#section-2.3 + + This method should ensure that provided token won't validate anymore. + It can be simply removing RequestToken from storage or setting + specific flag that makes it invalid (note that such flag should be + also validated during request token validation). + + This method is used by + + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_client_key(self, client_key, request): + """Validates that supplied client key is a registered and valid client. + + :param client_key: The client/consumer key. + :param request: An oauthlib.common.Request object. + :returns: True or False + + Note that if the dummy client is supplied it should validate in same + or nearly the same amount of time as a valid one. + + Ensure latency inducing tasks are mimiced even for dummy clients. + For example, use:: + + from your_datastore import Client + try: + return Client.exists(client_key, access_token) + except DoesNotExist: + return False + + Rather than:: + + from your_datastore import Client + if access_token == self.dummy_access_token: + return False + else: + return Client.exists(client_key, access_token) + + This method is used by + + * AccessTokenEndpoint + * RequestTokenEndpoint + * ResourceEndpoint + * SignatureOnlyEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_request_token(self, client_key, token, request): + """Validates that supplied request token is registered and valid. + + :param client_key: The client/consumer key. + :param token: The request token string. + :param request: An oauthlib.common.Request object. + :returns: True or False + + Note that if the dummy request_token is supplied it should validate in + the same nearly the same amount of time as a valid one. + + Ensure latency inducing tasks are mimiced even for dummy clients. + For example, use:: + + from your_datastore import RequestToken + try: + return RequestToken.exists(client_key, access_token) + except DoesNotExist: + return False + + Rather than:: + + from your_datastore import RequestToken + if access_token == self.dummy_access_token: + return False + else: + return RequestToken.exists(client_key, access_token) + + This method is used by + + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_access_token(self, client_key, token, request): + """Validates that supplied access token is registered and valid. + + :param client_key: The client/consumer key. + :param token: The access token string. + :param request: An oauthlib.common.Request object. + :returns: True or False + + Note that if the dummy access token is supplied it should validate in + the same or nearly the same amount of time as a valid one. + + Ensure latency inducing tasks are mimiced even for dummy clients. + For example, use:: + + from your_datastore import AccessToken + try: + return AccessToken.exists(client_key, access_token) + except DoesNotExist: + return False + + Rather than:: + + from your_datastore import AccessToken + if access_token == self.dummy_access_token: + return False + else: + return AccessToken.exists(client_key, access_token) + + This method is used by + + * ResourceEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_timestamp_and_nonce(self, client_key, timestamp, nonce, + request, request_token=None, access_token=None): + """Validates that the nonce has not been used before. + + :param client_key: The client/consumer key. + :param timestamp: The ``oauth_timestamp`` parameter. + :param nonce: The ``oauth_nonce`` parameter. + :param request_token: Request token string, if any. + :param access_token: Access token string, if any. + :param request: An oauthlib.common.Request object. + :returns: True or False + + Per `Section 3.3`_ of the spec. + + "A nonce is a random string, uniquely generated by the client to allow + the server to verify that a request has never been made before and + helps prevent replay attacks when requests are made over a non-secure + channel. The nonce value MUST be unique across all requests with the + same timestamp, client credentials, and token combinations." + + .. _`Section 3.3`: http://tools.ietf.org/html/rfc5849#section-3.3 + + One of the first validation checks that will be made is for the validity + of the nonce and timestamp, which are associated with a client key and + possibly a token. If invalid then immediately fail the request + by returning False. If the nonce/timestamp pair has been used before and + you may just have detected a replay attack. Therefore it is an essential + part of OAuth security that you not allow nonce/timestamp reuse. + Note that this validation check is done before checking the validity of + the client and token.:: + + nonces_and_timestamps_database = [ + (u'foo', 1234567890, u'rannoMstrInghere', u'bar') + ] + + def validate_timestamp_and_nonce(self, client_key, timestamp, nonce, + request_token=None, access_token=None): + + return ((client_key, timestamp, nonce, request_token or access_token) + not in self.nonces_and_timestamps_database) + + This method is used by + + * AccessTokenEndpoint + * RequestTokenEndpoint + * ResourceEndpoint + * SignatureOnlyEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_redirect_uri(self, client_key, redirect_uri, request): + """Validates the client supplied redirection URI. + + :param client_key: The client/consumer key. + :param redirect_uri: The URI the client which to redirect back to after + authorization is successful. + :param request: An oauthlib.common.Request object. + :returns: True or False + + It is highly recommended that OAuth providers require their clients + to register all redirection URIs prior to using them in requests and + register them as absolute URIs. See `CWE-601`_ for more information + about open redirection attacks. + + By requiring registration of all redirection URIs it should be + straightforward for the provider to verify whether the supplied + redirect_uri is valid or not. + + Alternatively per `Section 2.1`_ of the spec: + + "If the client is unable to receive callbacks or a callback URI has + been established via other means, the parameter value MUST be set to + "oob" (case sensitive), to indicate an out-of-band configuration." + + .. _`CWE-601`: http://cwe.mitre.org/top25/index.html#CWE-601 + .. _`Section 2.1`: https://tools.ietf.org/html/rfc5849#section-2.1 + + This method is used by + + * RequestTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_requested_realms(self, client_key, realms, request): + """Validates that the client may request access to the realm. + + :param client_key: The client/consumer key. + :param realms: The list of realms that client is requesting access to. + :param request: An oauthlib.common.Request object. + :returns: True or False + + This method is invoked when obtaining a request token and should + tie a realm to the request token and after user authorization + this realm restriction should transfer to the access token. + + This method is used by + + * RequestTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_realms(self, client_key, token, request, uri=None, + realms=None): + """Validates access to the request realm. + + :param client_key: The client/consumer key. + :param token: A request token string. + :param request: An oauthlib.common.Request object. + :param uri: The URI the realms is protecting. + :param realms: A list of realms that must have been granted to + the access token. + :returns: True or False + + How providers choose to use the realm parameter is outside the OAuth + specification but it is commonly used to restrict access to a subset + of protected resources such as "photos". + + realms is a convenience parameter which can be used to provide + a per view method pre-defined list of allowed realms. + + Can be as simple as:: + + from your_datastore import RequestToken + request_token = RequestToken.get(token, None) + + if not request_token: + return False + return set(request_token.realms).issuperset(set(realms)) + + This method is used by + + * ResourceEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def validate_verifier(self, client_key, token, verifier, request): + """Validates a verification code. + + :param client_key: The client/consumer key. + :param token: A request token string. + :param verifier: The authorization verifier string. + :param request: An oauthlib.common.Request object. + :returns: True or False + + OAuth providers issue a verification code to clients after the + resource owner authorizes access. This code is used by the client to + obtain token credentials and the provider must verify that the + verifier is valid and associated with the client as well as the + resource owner. + + Verifier validation should be done in near constant time + (to avoid verifier enumeration). To achieve this we need a + constant time string comparison which is provided by OAuthLib + in ``oauthlib.common.safe_string_equals``:: + + from your_datastore import Verifier + correct_verifier = Verifier.get(client_key, request_token) + from oauthlib.common import safe_string_equals + return safe_string_equals(verifier, correct_verifier) + + This method is used by + + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def verify_request_token(self, token, request): + """Verify that the given OAuth1 request token is valid. + + :param token: A request token string. + :param request: An oauthlib.common.Request object. + :returns: True or False + + This method is used only in AuthorizationEndpoint to check whether the + oauth_token given in the authorization URL is valid or not. + This request is not signed and thus similar ``validate_request_token`` + method can not be used. + + This method is used by + + * AuthorizationEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def verify_realms(self, token, realms, request): + """Verify authorized realms to see if they match those given to token. + + :param token: An access token string. + :param realms: A list of realms the client attempts to access. + :param request: An oauthlib.common.Request object. + :returns: True or False + + This prevents the list of authorized realms sent by the client during + the authorization step to be altered to include realms outside what + was bound with the request token. + + Can be as simple as:: + + valid_realms = self.get_realms(token) + return all((r in valid_realms for r in realms)) + + This method is used by + + * AuthorizationEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def save_access_token(self, token, request): + """Save an OAuth1 access token. + + :param token: A dict with token credentials. + :param request: An oauthlib.common.Request object. + + The token dictionary will at minimum include + + * ``oauth_token`` the access token string. + * ``oauth_token_secret`` the token specific secret used in signing. + * ``oauth_authorized_realms`` a space separated list of realms. + + Client key can be obtained from ``request.client_key``. + + The list of realms (not joined string) can be obtained from + ``request.realm``. + + This method is used by + + * AccessTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def save_request_token(self, token, request): + """Save an OAuth1 request token. + + :param token: A dict with token credentials. + :param request: An oauthlib.common.Request object. + + The token dictionary will at minimum include + + * ``oauth_token`` the request token string. + * ``oauth_token_secret`` the token specific secret used in signing. + * ``oauth_callback_confirmed`` the string ``true``. + + Client key can be obtained from ``request.client_key``. + + This method is used by + + * RequestTokenEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") + + def save_verifier(self, token, verifier, request): + """Associate an authorization verifier with a request token. + + :param token: A request token string. + :param verifier A dictionary containing the oauth_verifier and + oauth_token + :param request: An oauthlib.common.Request object. + + We need to associate verifiers with tokens for validation during the + access token request. + + Note that unlike save_x_token token here is the ``oauth_token`` token + string from the request token saved previously. + + This method is used by + + * AuthorizationEndpoint + """ + raise NotImplementedError("Subclasses must implement this function.") diff --git a/oauthlib/oauth1/rfc5849/signature.py b/oauthlib/oauth1/rfc5849/signature.py new file mode 100644 index 0000000..f57d80a --- /dev/null +++ b/oauthlib/oauth1/rfc5849/signature.py @@ -0,0 +1,609 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth1.rfc5849.signature +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module represents a direct implementation of `section 3.4`_ of the spec. + +Terminology: + * Client: software interfacing with an OAuth API + * Server: the API provider + * Resource Owner: the user who is granting authorization to the client + +Steps for signing a request: + +1. Collect parameters from the uri query, auth header, & body +2. Normalize those parameters +3. Normalize the uri +4. Pass the normalized uri, normalized parameters, and http method to + construct the base string +5. Pass the base string and any keys needed to a signing function + +.. _`section 3.4`: http://tools.ietf.org/html/rfc5849#section-3.4 +""" +from __future__ import absolute_import, unicode_literals + +import binascii +import hashlib +import hmac +try: + import urlparse +except ImportError: + import urllib.parse as urlparse +from . import utils +from oauthlib.common import urldecode, extract_params, safe_string_equals +from oauthlib.common import bytes_type, unicode_type + + +def construct_base_string(http_method, base_string_uri, + normalized_encoded_request_parameters): + """**String Construction** + Per `section 3.4.1.1`_ of the spec. + + For example, the HTTP request:: + + POST /request?b5=%3D%253D&a3=a&c%40=&a2=r%20b HTTP/1.1 + Host: example.com + Content-Type: application/x-www-form-urlencoded + Authorization: OAuth realm="Example", + oauth_consumer_key="9djdj82h48djs9d2", + oauth_token="kkk9d7dh3k39sjv7", + oauth_signature_method="HMAC-SHA1", + oauth_timestamp="137131201", + oauth_nonce="7d8f3e4a", + oauth_signature="bYT5CMsGcbgUdFHObYMEfcx6bsw%3D" + + c2&a3=2+q + + is represented by the following signature base string (line breaks + are for display purposes only):: + + POST&http%3A%2F%2Fexample.com%2Frequest&a2%3Dr%2520b%26a3%3D2%2520q + %26a3%3Da%26b5%3D%253D%25253D%26c%2540%3D%26c2%3D%26oauth_consumer_ + key%3D9djdj82h48djs9d2%26oauth_nonce%3D7d8f3e4a%26oauth_signature_m + ethod%3DHMAC-SHA1%26oauth_timestamp%3D137131201%26oauth_token%3Dkkk + 9d7dh3k39sjv7 + + .. _`section 3.4.1.1`: http://tools.ietf.org/html/rfc5849#section-3.4.1.1 + """ + + # The signature base string is constructed by concatenating together, + # in order, the following HTTP request elements: + + # 1. The HTTP request method in uppercase. For example: "HEAD", + # "GET", "POST", etc. If the request uses a custom HTTP method, it + # MUST be encoded (`Section 3.6`_). + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + base_string = utils.escape(http_method.upper()) + + # 2. An "&" character (ASCII code 38). + base_string += '&' + + # 3. The base string URI from `Section 3.4.1.2`_, after being encoded + # (`Section 3.6`_). + # + # .. _`Section 3.4.1.2`: http://tools.ietf.org/html/rfc5849#section-3.4.1.2 + # .. _`Section 3.4.6`: http://tools.ietf.org/html/rfc5849#section-3.4.6 + base_string += utils.escape(base_string_uri) + + # 4. An "&" character (ASCII code 38). + base_string += '&' + + # 5. The request parameters as normalized in `Section 3.4.1.3.2`_, after + # being encoded (`Section 3.6`). + # + # .. _`Section 3.4.1.3.2`: http://tools.ietf.org/html/rfc5849#section-3.4.1.3.2 + # .. _`Section 3.4.6`: http://tools.ietf.org/html/rfc5849#section-3.4.6 + base_string += utils.escape(normalized_encoded_request_parameters) + + return base_string + + +def normalize_base_string_uri(uri, host=None): + """**Base String URI** + Per `section 3.4.1.2`_ of the spec. + + For example, the HTTP request:: + + GET /r%20v/X?id=123 HTTP/1.1 + Host: EXAMPLE.COM:80 + + is represented by the base string URI: "http://example.com/r%20v/X". + + In another example, the HTTPS request:: + + GET /?q=1 HTTP/1.1 + Host: www.example.net:8080 + + is represented by the base string URI: "https://www.example.net:8080/". + + .. _`section 3.4.1.2`: http://tools.ietf.org/html/rfc5849#section-3.4.1.2 + + The host argument overrides the netloc part of the uri argument. + """ + if not isinstance(uri, unicode_type): + raise ValueError('uri must be a unicode object.') + + # FIXME: urlparse does not support unicode + scheme, netloc, path, params, query, fragment = urlparse.urlparse(uri) + + # The scheme, authority, and path of the request resource URI `RFC3986` + # are included by constructing an "http" or "https" URI representing + # the request resource (without the query or fragment) as follows: + # + # .. _`RFC3986`: http://tools.ietf.org/html/rfc3986 + + if not scheme or not netloc: + raise ValueError('uri must include a scheme and netloc') + + # Per `RFC 2616 section 5.1.2`_: + # + # Note that the absolute path cannot be empty; if none is present in + # the original URI, it MUST be given as "/" (the server root). + # + # .. _`RFC 2616 section 5.1.2`: http://tools.ietf.org/html/rfc2616#section-5.1.2 + if not path: + path = '/' + + # 1. The scheme and host MUST be in lowercase. + scheme = scheme.lower() + netloc = netloc.lower() + + # 2. The host and port values MUST match the content of the HTTP + # request "Host" header field. + if host is not None: + netloc = host.lower() + + # 3. The port MUST be included if it is not the default port for the + # scheme, and MUST be excluded if it is the default. Specifically, + # the port MUST be excluded when making an HTTP request `RFC2616`_ + # to port 80 or when making an HTTPS request `RFC2818`_ to port 443. + # All other non-default port numbers MUST be included. + # + # .. _`RFC2616`: http://tools.ietf.org/html/rfc2616 + # .. _`RFC2818`: http://tools.ietf.org/html/rfc2818 + default_ports = ( + ('http', '80'), + ('https', '443'), + ) + if ':' in netloc: + host, port = netloc.split(':', 1) + if (scheme, port) in default_ports: + netloc = host + + return urlparse.urlunparse((scheme, netloc, path, params, '', '')) + + +# ** Request Parameters ** +# +# Per `section 3.4.1.3`_ of the spec. +# +# In order to guarantee a consistent and reproducible representation of +# the request parameters, the parameters are collected and decoded to +# their original decoded form. They are then sorted and encoded in a +# particular manner that is often different from their original +# encoding scheme, and concatenated into a single string. +# +# .. _`section 3.4.1.3`: http://tools.ietf.org/html/rfc5849#section-3.4.1.3 + +def collect_parameters(uri_query='', body=[], headers=None, + exclude_oauth_signature=True, with_realm=False): + """**Parameter Sources** + + Parameters starting with `oauth_` will be unescaped. + + Body parameters must be supplied as a dict, a list of 2-tuples, or a + formencoded query string. + + Headers must be supplied as a dict. + + Per `section 3.4.1.3.1`_ of the spec. + + For example, the HTTP request:: + + POST /request?b5=%3D%253D&a3=a&c%40=&a2=r%20b HTTP/1.1 + Host: example.com + Content-Type: application/x-www-form-urlencoded + Authorization: OAuth realm="Example", + oauth_consumer_key="9djdj82h48djs9d2", + oauth_token="kkk9d7dh3k39sjv7", + oauth_signature_method="HMAC-SHA1", + oauth_timestamp="137131201", + oauth_nonce="7d8f3e4a", + oauth_signature="djosJKDKJSD8743243%2Fjdk33klY%3D" + + c2&a3=2+q + + contains the following (fully decoded) parameters used in the + signature base sting:: + + +------------------------+------------------+ + | Name | Value | + +------------------------+------------------+ + | b5 | =%3D | + | a3 | a | + | c@ | | + | a2 | r b | + | oauth_consumer_key | 9djdj82h48djs9d2 | + | oauth_token | kkk9d7dh3k39sjv7 | + | oauth_signature_method | HMAC-SHA1 | + | oauth_timestamp | 137131201 | + | oauth_nonce | 7d8f3e4a | + | c2 | | + | a3 | 2 q | + +------------------------+------------------+ + + Note that the value of "b5" is "=%3D" and not "==". Both "c@" and + "c2" have empty values. While the encoding rules specified in this + specification for the purpose of constructing the signature base + string exclude the use of a "+" character (ASCII code 43) to + represent an encoded space character (ASCII code 32), this practice + is widely used in "application/x-www-form-urlencoded" encoded values, + and MUST be properly decoded, as demonstrated by one of the "a3" + parameter instances (the "a3" parameter is used twice in this + request). + + .. _`section 3.4.1.3.1`: http://tools.ietf.org/html/rfc5849#section-3.4.1.3.1 + """ + headers = headers or {} + params = [] + + # The parameters from the following sources are collected into a single + # list of name/value pairs: + + # * The query component of the HTTP request URI as defined by + # `RFC3986, Section 3.4`_. The query component is parsed into a list + # of name/value pairs by treating it as an + # "application/x-www-form-urlencoded" string, separating the names + # and values and decoding them as defined by + # `W3C.REC-html40-19980424`_, Section 17.13.4. + # + # .. _`RFC3986, Section 3.4`: http://tools.ietf.org/html/rfc3986#section-3.4 + # .. _`W3C.REC-html40-19980424`: http://tools.ietf.org/html/rfc5849#ref-W3C.REC-html40-19980424 + if uri_query: + params.extend(urldecode(uri_query)) + + # * The OAuth HTTP "Authorization" header field (`Section 3.5.1`_) if + # present. The header's content is parsed into a list of name/value + # pairs excluding the "realm" parameter if present. The parameter + # values are decoded as defined by `Section 3.5.1`_. + # + # .. _`Section 3.5.1`: http://tools.ietf.org/html/rfc5849#section-3.5.1 + if headers: + headers_lower = dict((k.lower(), v) for k, v in headers.items()) + authorization_header = headers_lower.get('authorization') + if authorization_header is not None: + params.extend([i for i in utils.parse_authorization_header( + authorization_header) if with_realm or i[0] != 'realm']) + + # * The HTTP request entity-body, but only if all of the following + # conditions are met: + # * The entity-body is single-part. + # + # * The entity-body follows the encoding requirements of the + # "application/x-www-form-urlencoded" content-type as defined by + # `W3C.REC-html40-19980424`_. + + # * The HTTP request entity-header includes the "Content-Type" + # header field set to "application/x-www-form-urlencoded". + # + # .._`W3C.REC-html40-19980424`: http://tools.ietf.org/html/rfc5849#ref-W3C.REC-html40-19980424 + + # TODO: enforce header param inclusion conditions + bodyparams = extract_params(body) or [] + params.extend(bodyparams) + + # ensure all oauth params are unescaped + unescaped_params = [] + for k, v in params: + if k.startswith('oauth_'): + v = utils.unescape(v) + unescaped_params.append((k, v)) + + # The "oauth_signature" parameter MUST be excluded from the signature + # base string if present. + if exclude_oauth_signature: + unescaped_params = list(filter(lambda i: i[0] != 'oauth_signature', + unescaped_params)) + + return unescaped_params + + +def normalize_parameters(params): + """**Parameters Normalization** + Per `section 3.4.1.3.2`_ of the spec. + + For example, the list of parameters from the previous section would + be normalized as follows: + + Encoded:: + + +------------------------+------------------+ + | Name | Value | + +------------------------+------------------+ + | b5 | %3D%253D | + | a3 | a | + | c%40 | | + | a2 | r%20b | + | oauth_consumer_key | 9djdj82h48djs9d2 | + | oauth_token | kkk9d7dh3k39sjv7 | + | oauth_signature_method | HMAC-SHA1 | + | oauth_timestamp | 137131201 | + | oauth_nonce | 7d8f3e4a | + | c2 | | + | a3 | 2%20q | + +------------------------+------------------+ + + Sorted:: + + +------------------------+------------------+ + | Name | Value | + +------------------------+------------------+ + | a2 | r%20b | + | a3 | 2%20q | + | a3 | a | + | b5 | %3D%253D | + | c%40 | | + | c2 | | + | oauth_consumer_key | 9djdj82h48djs9d2 | + | oauth_nonce | 7d8f3e4a | + | oauth_signature_method | HMAC-SHA1 | + | oauth_timestamp | 137131201 | + | oauth_token | kkk9d7dh3k39sjv7 | + +------------------------+------------------+ + + Concatenated Pairs:: + + +-------------------------------------+ + | Name=Value | + +-------------------------------------+ + | a2=r%20b | + | a3=2%20q | + | a3=a | + | b5=%3D%253D | + | c%40= | + | c2= | + | oauth_consumer_key=9djdj82h48djs9d2 | + | oauth_nonce=7d8f3e4a | + | oauth_signature_method=HMAC-SHA1 | + | oauth_timestamp=137131201 | + | oauth_token=kkk9d7dh3k39sjv7 | + +-------------------------------------+ + + and concatenated together into a single string (line breaks are for + display purposes only):: + + a2=r%20b&a3=2%20q&a3=a&b5=%3D%253D&c%40=&c2=&oauth_consumer_key=9dj + dj82h48djs9d2&oauth_nonce=7d8f3e4a&oauth_signature_method=HMAC-SHA1 + &oauth_timestamp=137131201&oauth_token=kkk9d7dh3k39sjv7 + + .. _`section 3.4.1.3.2`: http://tools.ietf.org/html/rfc5849#section-3.4.1.3.2 + """ + + # The parameters collected in `Section 3.4.1.3`_ are normalized into a + # single string as follows: + # + # .. _`Section 3.4.1.3`: http://tools.ietf.org/html/rfc5849#section-3.4.1.3 + + # 1. First, the name and value of each parameter are encoded + # (`Section 3.6`_). + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + key_values = [(utils.escape(k), utils.escape(v)) for k, v in params] + + # 2. The parameters are sorted by name, using ascending byte value + # ordering. If two or more parameters share the same name, they + # are sorted by their value. + key_values.sort() + + # 3. The name of each parameter is concatenated to its corresponding + # value using an "=" character (ASCII code 61) as a separator, even + # if the value is empty. + parameter_parts = ['{0}={1}'.format(k, v) for k, v in key_values] + + # 4. The sorted name/value pairs are concatenated together into a + # single string by using an "&" character (ASCII code 38) as + # separator. + return '&'.join(parameter_parts) + + +def sign_hmac_sha1_with_client(base_string, client): + return sign_hmac_sha1(base_string, + client.client_secret, + client.resource_owner_secret + ) + + +def sign_hmac_sha1(base_string, client_secret, resource_owner_secret): + """**HMAC-SHA1** + + The "HMAC-SHA1" signature method uses the HMAC-SHA1 signature + algorithm as defined in `RFC2104`_:: + + digest = HMAC-SHA1 (key, text) + + Per `section 3.4.2`_ of the spec. + + .. _`RFC2104`: http://tools.ietf.org/html/rfc2104 + .. _`section 3.4.2`: http://tools.ietf.org/html/rfc5849#section-3.4.2 + """ + + # The HMAC-SHA1 function variables are used in following way: + + # text is set to the value of the signature base string from + # `Section 3.4.1.1`_. + # + # .. _`Section 3.4.1.1`: http://tools.ietf.org/html/rfc5849#section-3.4.1.1 + text = base_string + + # key is set to the concatenated values of: + # 1. The client shared-secret, after being encoded (`Section 3.6`_). + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + key = utils.escape(client_secret or '') + + # 2. An "&" character (ASCII code 38), which MUST be included + # even when either secret is empty. + key += '&' + + # 3. The token shared-secret, after being encoded (`Section 3.6`_). + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + key += utils.escape(resource_owner_secret or '') + + # FIXME: HMAC does not support unicode! + key_utf8 = key.encode('utf-8') + text_utf8 = text.encode('utf-8') + signature = hmac.new(key_utf8, text_utf8, hashlib.sha1) + + # digest is used to set the value of the "oauth_signature" protocol + # parameter, after the result octet string is base64-encoded + # per `RFC2045, Section 6.8`. + # + # .. _`RFC2045, Section 6.8`: http://tools.ietf.org/html/rfc2045#section-6.8 + return binascii.b2a_base64(signature.digest())[:-1].decode('utf-8') + +_jwtrs1 = None + +#jwt has some nice pycrypto/cryptography abstractions +def _jwt_rs1_signing_algorithm(): + global _jwtrs1 + if _jwtrs1 is None: + import jwt.algorithms as jwtalgo + _jwtrs1 = jwtalgo.RSAAlgorithm(jwtalgo.hashes.SHA1) + return _jwtrs1 + +def sign_rsa_sha1(base_string, rsa_private_key): + """**RSA-SHA1** + + Per `section 3.4.3`_ of the spec. + + The "RSA-SHA1" signature method uses the RSASSA-PKCS1-v1_5 signature + algorithm as defined in `RFC3447, Section 8.2`_ (also known as + PKCS#1), using SHA-1 as the hash function for EMSA-PKCS1-v1_5. To + use this method, the client MUST have established client credentials + with the server that included its RSA public key (in a manner that is + beyond the scope of this specification). + + .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3 + .. _`RFC3447, Section 8.2`: http://tools.ietf.org/html/rfc3447#section-8.2 + + """ + if isinstance(base_string, unicode_type): + base_string = base_string.encode('utf-8') + # TODO: finish RSA documentation + alg = _jwt_rs1_signing_algorithm() + key = _prepare_key_plus(alg, rsa_private_key) + s=alg.sign(base_string, key) + return binascii.b2a_base64(s)[:-1].decode('utf-8') + + +def sign_rsa_sha1_with_client(base_string, client): + return sign_rsa_sha1(base_string, client.rsa_key) + + +def sign_plaintext(client_secret, resource_owner_secret): + """Sign a request using plaintext. + + Per `section 3.4.4`_ of the spec. + + The "PLAINTEXT" method does not employ a signature algorithm. It + MUST be used with a transport-layer mechanism such as TLS or SSL (or + sent over a secure channel with equivalent protections). It does not + utilize the signature base string or the "oauth_timestamp" and + "oauth_nonce" parameters. + + .. _`section 3.4.4`: http://tools.ietf.org/html/rfc5849#section-3.4.4 + + """ + + # The "oauth_signature" protocol parameter is set to the concatenated + # value of: + + # 1. The client shared-secret, after being encoded (`Section 3.6`_). + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + signature = utils.escape(client_secret or '') + + # 2. An "&" character (ASCII code 38), which MUST be included even + # when either secret is empty. + signature += '&' + + # 3. The token shared-secret, after being encoded (`Section 3.6`_). + # + # .. _`Section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + signature += utils.escape(resource_owner_secret or '') + + return signature + + +def sign_plaintext_with_client(base_string, client): + return sign_plaintext(client.client_secret, client.resource_owner_secret) + + +def verify_hmac_sha1(request, client_secret=None, + resource_owner_secret=None): + """Verify a HMAC-SHA1 signature. + + Per `section 3.4`_ of the spec. + + .. _`section 3.4`: http://tools.ietf.org/html/rfc5849#section-3.4 + + To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri + attribute MUST be an absolute URI whose netloc part identifies the + origin server or gateway on which the resource resides. Any Host + item of the request argument's headers dict attribute will be + ignored. + + .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2 + + """ + norm_params = normalize_parameters(request.params) + uri = normalize_base_string_uri(request.uri) + base_string = construct_base_string(request.http_method, uri, norm_params) + signature = sign_hmac_sha1(base_string, client_secret, + resource_owner_secret) + return safe_string_equals(signature, request.signature) + +def _prepare_key_plus(alg, keystr): + if isinstance(keystr, bytes_type): + keystr = keystr.decode('utf-8') + return alg.prepare_key(keystr) + +def verify_rsa_sha1(request, rsa_public_key): + """Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature. + + Per `section 3.4.3`_ of the spec. + + Note this method requires the jwt and cryptography libraries. + + .. _`section 3.4.3`: http://tools.ietf.org/html/rfc5849#section-3.4.3 + + To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri + attribute MUST be an absolute URI whose netloc part identifies the + origin server or gateway on which the resource resides. Any Host + item of the request argument's headers dict attribute will be + ignored. + + .. _`RFC2616 section 5.2`: http://tools.ietf.org/html/rfc2616#section-5.2 + """ + norm_params = normalize_parameters(request.params) + uri = normalize_base_string_uri(request.uri) + message = construct_base_string(request.http_method, uri, norm_params).encode('utf-8') + sig = binascii.a2b_base64(request.signature.encode('utf-8')) + + alg = _jwt_rs1_signing_algorithm() + key = _prepare_key_plus(alg, rsa_public_key) + return alg.verify(message, key, sig) + + +def verify_plaintext(request, client_secret=None, resource_owner_secret=None): + """Verify a PLAINTEXT signature. + + Per `section 3.4`_ of the spec. + + .. _`section 3.4`: http://tools.ietf.org/html/rfc5849#section-3.4 + """ + signature = sign_plaintext(client_secret, resource_owner_secret) + return safe_string_equals(signature, request.signature) diff --git a/oauthlib/oauth1/rfc5849/utils.py b/oauthlib/oauth1/rfc5849/utils.py new file mode 100644 index 0000000..eafb303 --- /dev/null +++ b/oauthlib/oauth1/rfc5849/utils.py @@ -0,0 +1,89 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.utils +~~~~~~~~~~~~~~ + +This module contains utility methods used by various parts of the OAuth +spec. +""" +from __future__ import absolute_import, unicode_literals + +try: + import urllib2 +except ImportError: + import urllib.request as urllib2 + +from oauthlib.common import quote, unquote, bytes_type, unicode_type + +UNICODE_ASCII_CHARACTER_SET = ('abcdefghijklmnopqrstuvwxyz' + 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' + '0123456789') + + +def filter_params(target): + """Decorator which filters params to remove non-oauth_* parameters + + Assumes the decorated method takes a params dict or list of tuples as its + first argument. + """ + def wrapper(params, *args, **kwargs): + params = filter_oauth_params(params) + return target(params, *args, **kwargs) + + wrapper.__doc__ = target.__doc__ + return wrapper + + +def filter_oauth_params(params): + """Removes all non oauth parameters from a dict or a list of params.""" + is_oauth = lambda kv: kv[0].startswith("oauth_") + if isinstance(params, dict): + return list(filter(is_oauth, list(params.items()))) + else: + return list(filter(is_oauth, params)) + + +def escape(u): + """Escape a unicode string in an OAuth-compatible fashion. + + Per `section 3.6`_ of the spec. + + .. _`section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6 + + """ + if not isinstance(u, unicode_type): + raise ValueError('Only unicode objects are escapable. ' + + 'Got %s of type %s.' % (u, type(u))) + # Letters, digits, and the characters '_.-' are already treated as safe + # by urllib.quote(). We need to add '~' to fully support rfc5849. + return quote(u, safe=b'~') + + +def unescape(u): + if not isinstance(u, unicode_type): + raise ValueError('Only unicode objects are unescapable.') + return unquote(u) + + +def parse_keqv_list(l): + """A unicode-safe version of urllib2.parse_keqv_list""" + # With Python 2.6, parse_http_list handles unicode fine + return urllib2.parse_keqv_list(l) + + +def parse_http_list(u): + """A unicode-safe version of urllib2.parse_http_list""" + # With Python 2.6, parse_http_list handles unicode fine + return urllib2.parse_http_list(u) + + +def parse_authorization_header(authorization_header): + """Parse an OAuth authorization header into a list of 2-tuples""" + auth_scheme = 'OAuth '.lower() + if authorization_header[:len(auth_scheme)].lower().startswith(auth_scheme): + items = parse_http_list(authorization_header[len(auth_scheme):]) + try: + return list(parse_keqv_list(items).items()) + except (IndexError, ValueError): + pass + raise ValueError('Malformed authorization header') diff --git a/oauthlib/oauth2/__init__.py b/oauthlib/oauth2/__init__.py new file mode 100644 index 0000000..a13e484 --- /dev/null +++ b/oauthlib/oauth2/__init__.py @@ -0,0 +1,34 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2 +~~~~~~~~~~~~~~ + +This module is a wrapper for the most recent implementation of OAuth 2.0 Client +and Server classes. +""" +from __future__ import absolute_import, unicode_literals + +from .rfc6749.clients import Client +from .rfc6749.clients import WebApplicationClient +from .rfc6749.clients import MobileApplicationClient +from .rfc6749.clients import LegacyApplicationClient +from .rfc6749.clients import BackendApplicationClient +from .rfc6749.clients import ServiceApplicationClient +from .rfc6749.endpoints import AuthorizationEndpoint +from .rfc6749.endpoints import TokenEndpoint +from .rfc6749.endpoints import ResourceEndpoint +from .rfc6749.endpoints import RevocationEndpoint +from .rfc6749.endpoints import Server +from .rfc6749.endpoints import WebApplicationServer +from .rfc6749.endpoints import MobileApplicationServer +from .rfc6749.endpoints import LegacyApplicationServer +from .rfc6749.endpoints import BackendApplicationServer +from .rfc6749.errors import * +from .rfc6749.grant_types import AuthorizationCodeGrant +from .rfc6749.grant_types import ImplicitGrant +from .rfc6749.grant_types import ResourceOwnerPasswordCredentialsGrant +from .rfc6749.grant_types import ClientCredentialsGrant +from .rfc6749.grant_types import RefreshTokenGrant +from .rfc6749.request_validator import RequestValidator +from .rfc6749.tokens import BearerToken, OAuth2Token +from .rfc6749.utils import is_secure_transport diff --git a/oauthlib/oauth2/rfc6749/__init__.py b/oauthlib/oauth2/rfc6749/__init__.py new file mode 100644 index 0000000..aff0ed8 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/__init__.py @@ -0,0 +1,66 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import functools +import logging + +from .errors import TemporarilyUnavailableError, ServerError +from .errors import FatalClientError, OAuth2Error + + +log = logging.getLogger(__name__) + + +class BaseEndpoint(object): + + def __init__(self): + self._available = True + self._catch_errors = False + + @property + def available(self): + return self._available + + @available.setter + def available(self, available): + self._available = available + + @property + def catch_errors(self): + return self._catch_errors + + @catch_errors.setter + def catch_errors(self, catch_errors): + self._catch_errors = catch_errors + + +def catch_errors_and_unavailability(f): + @functools.wraps(f) + def wrapper(endpoint, uri, *args, **kwargs): + if not endpoint.available: + e = TemporarilyUnavailableError() + log.info('Endpoint unavailable, ignoring request %s.' % uri) + return {}, e.json, 503 + + if endpoint.catch_errors: + try: + return f(endpoint, uri, *args, **kwargs) + except OAuth2Error: + raise + except FatalClientError: + raise + except Exception as e: + error = ServerError() + log.warning( + 'Exception caught while processing request, %s.' % e) + return {}, error.json, 500 + else: + return f(endpoint, uri, *args, **kwargs) + return wrapper diff --git a/oauthlib/oauth2/rfc6749/clients/__init__.py b/oauthlib/oauth2/rfc6749/clients/__init__.py new file mode 100644 index 0000000..65bea50 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/__init__.py @@ -0,0 +1,16 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from .base import * +from .web_application import WebApplicationClient +from .mobile_application import MobileApplicationClient +from .legacy_application import LegacyApplicationClient +from .backend_application import BackendApplicationClient +from .service_application import ServiceApplicationClient diff --git a/oauthlib/oauth2/rfc6749/clients/backend_application.py b/oauthlib/oauth2/rfc6749/clients/backend_application.py new file mode 100644 index 0000000..445bdd5 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/backend_application.py @@ -0,0 +1,61 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from .base import Client +from ..parameters import prepare_token_request +from ..parameters import parse_token_response + + +class BackendApplicationClient(Client): + + """A public client utilizing the client credentials grant workflow. + + The client can request an access token using only its client + credentials (or other supported means of authentication) when the + client is requesting access to the protected resources under its + control, or those of another resource owner which has been previously + arranged with the authorization server (the method of which is beyond + the scope of this specification). + + The client credentials grant type MUST only be used by confidential + clients. + + Since the client authentication is used as the authorization grant, + no additional authorization request is needed. + """ + + def prepare_request_body(self, body='', scope=None, **kwargs): + """Add the client credentials to the request body. + + The client makes a request to the token endpoint by adding the + following parameters using the "application/x-www-form-urlencoded" + format per `Appendix B`_ in the HTTP request entity-body: + + :param scope: The scope of the access request as described by + `Section 3.3`_. + :param kwargs: Extra credentials to include in the token request. + + The client MUST authenticate with the authorization server as + described in `Section 3.2.1`_. + + The prepared body will include all provided credentials as well as + the ``grant_type`` parameter set to ``client_credentials``:: + + >>> from oauthlib.oauth2 import BackendApplicationClient + >>> client = BackendApplicationClient('your_id') + >>> client.prepare_request_body(scope=['hello', 'world']) + 'grant_type=client_credentials&scope=hello+world' + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 3.2.1`: http://tools.ietf.org/html/rfc6749#section-3.2.1 + """ + return prepare_token_request('client_credentials', body=body, + scope=scope, **kwargs) diff --git a/oauthlib/oauth2/rfc6749/clients/base.py b/oauthlib/oauth2/rfc6749/clients/base.py new file mode 100644 index 0000000..e53ccc1 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/base.py @@ -0,0 +1,490 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import time + +from oauthlib.common import generate_token +from oauthlib.oauth2.rfc6749 import tokens +from oauthlib.oauth2.rfc6749.parameters import parse_token_response +from oauthlib.oauth2.rfc6749.parameters import prepare_token_request +from oauthlib.oauth2.rfc6749.parameters import prepare_token_revocation_request +from oauthlib.oauth2.rfc6749.errors import TokenExpiredError +from oauthlib.oauth2.rfc6749.errors import InsecureTransportError +from oauthlib.oauth2.rfc6749.utils import is_secure_transport + + +AUTH_HEADER = 'auth_header' +URI_QUERY = 'query' +BODY = 'body' + +FORM_ENC_HEADERS = { + 'Content-Type': 'application/x-www-form-urlencoded' +} + +class Client(object): + + """Base OAuth2 client responsible for access token management. + + This class also acts as a generic interface providing methods common to all + client types such as ``prepare_authorization_request`` and + ``prepare_token_revocation_request``. The ``prepare_x_request`` methods are + the recommended way of interacting with clients (as opposed to the abstract + prepare uri/body/etc methods). They are recommended over the older set + because they are easier to use (more consistent) and add a few additional + security checks, such as HTTPS and state checking. + + Some of these methods require further implementation only provided by the + specific purpose clients such as + :py:class:`oauthlib.oauth2.MobileApplicationClient` and thus you should always + seek to use the client class matching the OAuth workflow you need. For + Python, this is usually :py:class:`oauthlib.oauth2.WebApplicationClient`. + + """ + + def __init__(self, client_id, + default_token_placement=AUTH_HEADER, + token_type='Bearer', + access_token=None, + refresh_token=None, + mac_key=None, + mac_algorithm=None, + token=None, + scope=None, + state=None, + redirect_url=None, + state_generator=generate_token, + **kwargs): + """Initialize a client with commonly used attributes. + + :param client_id: Client identifier given by the OAuth provider upon + registration. + + :param default_token_placement: Tokens can be supplied in the Authorization + header (default), the URL query component (``query``) or the request + body (``body``). + + :param token_type: OAuth 2 token type. Defaults to Bearer. Change this + if you specify the ``access_token`` parameter and know it is of a + different token type, such as a MAC, JWT or SAML token. Can + also be supplied as ``token_type`` inside the ``token`` dict parameter. + + :param access_token: An access token (string) used to authenticate + requests to protected resources. Can also be supplied inside the + ``token`` dict parameter. + + :param refresh_token: A refresh token (string) used to refresh expired + tokens. Can also be supplide inside the ``token`` dict parameter. + + :param mac_key: Encryption key used with MAC tokens. + + :param mac_algorithm: Hashing algorithm for MAC tokens. + + :param token: A dict of token attributes such as ``access_token``, + ``token_type`` and ``expires_at``. + + :param scope: A list of default scopes to request authorization for. + + :param state: A CSRF protection string used during authorization. + + :param redirect_url: The redirection endpoint on the client side to which + the user returns after authorization. + + :param state_generator: A no argument state generation callable. Defaults + to :py:meth:`oauthlib.common.generate_token`. + """ + + self.client_id = client_id + self.default_token_placement = default_token_placement + self.token_type = token_type + self.access_token = access_token + self.refresh_token = refresh_token + self.mac_key = mac_key + self.mac_algorithm = mac_algorithm + self.token = token or {} + self.scope = scope + self.state_generator = state_generator + self.state = state + self.redirect_url = redirect_url + self._expires_at = None + self._populate_attributes(self.token) + + @property + def token_types(self): + """Supported token types and their respective methods + + Additional tokens can be supported by extending this dictionary. + + The Bearer token spec is stable and safe to use. + + The MAC token spec is not yet stable and support for MAC tokens + is experimental and currently matching version 00 of the spec. + """ + return { + 'Bearer': self._add_bearer_token, + 'MAC': self._add_mac_token + } + + def prepare_request_uri(self, *args, **kwargs): + """Abstract method used to create request URIs.""" + raise NotImplementedError("Must be implemented by inheriting classes.") + + def prepare_request_body(self, *args, **kwargs): + """Abstract method used to create request bodies.""" + raise NotImplementedError("Must be implemented by inheriting classes.") + + def parse_request_uri_response(self, *args, **kwargs): + """Abstract method used to parse redirection responses.""" + + def add_token(self, uri, http_method='GET', body=None, headers=None, + token_placement=None, **kwargs): + """Add token to the request uri, body or authorization header. + + The access token type provides the client with the information + required to successfully utilize the access token to make a protected + resource request (along with type-specific attributes). The client + MUST NOT use an access token if it does not understand the token + type. + + For example, the "bearer" token type defined in + [`I-D.ietf-oauth-v2-bearer`_] is utilized by simply including the access + token string in the request: + + .. code-block:: http + + GET /resource/1 HTTP/1.1 + Host: example.com + Authorization: Bearer mF_9.B5f-4.1JqM + + while the "mac" token type defined in [`I-D.ietf-oauth-v2-http-mac`_] is + utilized by issuing a MAC key together with the access token which is + used to sign certain components of the HTTP requests: + + .. code-block:: http + + GET /resource/1 HTTP/1.1 + Host: example.com + Authorization: MAC id="h480djs93hd8", + nonce="274312:dj83hs9s", + mac="kDZvddkndxvhGRXZhvuDjEWhGeE=" + + .. _`I-D.ietf-oauth-v2-bearer`: http://tools.ietf.org/html/rfc6749#section-12.2 + .. _`I-D.ietf-oauth-v2-http-mac`: http://tools.ietf.org/html/rfc6749#section-12.2 + """ + if not is_secure_transport(uri): + raise InsecureTransportError() + + token_placement = token_placement or self.default_token_placement + + case_insensitive_token_types = dict( + (k.lower(), v) for k, v in self.token_types.items()) + if not self.token_type.lower() in case_insensitive_token_types: + raise ValueError("Unsupported token type: %s" % self.token_type) + + if not self.access_token: + raise ValueError("Missing access token.") + + if self._expires_at and self._expires_at < time.time(): + raise TokenExpiredError() + + return case_insensitive_token_types[self.token_type.lower()](uri, http_method, body, + headers, token_placement, **kwargs) + + def prepare_authorization_request(self, authorization_url, state=None, + redirect_url=None, scope=None, **kwargs): + """Prepare the authorization request. + + This is the first step in many OAuth flows in which the user is + redirected to a certain authorization URL. This method adds + required parameters to the authorization URL. + + :param authorization_url: Provider authorization endpoint URL. + + :param state: CSRF protection string. Will be automatically created if + not provided. The generated state is available via the ``state`` + attribute. Clients should verify that the state is unchanged and + present in the authorization response. This verification is done + automatically if using the ``authorization_response`` parameter + with ``prepare_token_request``. + + :param redirect_url: Redirect URL to which the user will be returned + after authorization. Must be provided unless previously setup with + the provider. If provided then it must also be provided in the + token request. + + :param kwargs: Additional parameters to included in the request. + + :returns: The prepared request tuple with (url, headers, body). + """ + if not is_secure_transport(authorization_url): + raise InsecureTransportError() + + self.state = state or self.state_generator() + self.redirect_url = redirect_url or self.redirect_url + self.scope = scope or self.scope + auth_url = self.prepare_request_uri( + authorization_url, redirect_uri=self.redirect_uri, + scope=self.scope, state=self.state, **kwargs) + return auth_url, FORM_ENC_HEADERS, '' + + def prepare_token_request(self, token_url, authorization_response=None, + redirect_url=None, state=None, body='', **kwargs): + """Prepare a token creation request. + + Note that these requests usually require client authentication, either + by including client_id or a set of provider specific authentication + credentials. + + :param token_url: Provider token creation endpoint URL. + + :param authorization_response: The full redirection URL string, i.e. + the location to which the user was redirected after successfull + authorization. Used to mine credentials needed to obtain a token + in this step, such as authorization code. + + :param redirect_url: The redirect_url supplied with the authorization + request (if there was one). + + :param body: Request body (URL encoded string). + + :param kwargs: Additional parameters to included in the request. + + :returns: The prepared request tuple with (url, headers, body). + """ + if not is_secure_transport(token_url): + raise InsecureTransportError() + + state = state or self.state + if authorization_response: + self.parse_request_uri_response( + authorization_response, state=state) + self.redirect_url = redirect_url or self.redirect_url + body = self.prepare_request_body(body=body, + redirect_uri=self.redirect_url, **kwargs) + + return token_url, FORM_ENC_HEADERS, body + + def prepare_refresh_token_request(self, token_url, refresh_token=None, + body='', scope=None, **kwargs): + """Prepare an access token refresh request. + + Expired access tokens can be replaced by new access tokens without + going through the OAuth dance if the client obtained a refresh token. + This refresh token and authentication credentials can be used to + obtain a new access token, and possibly a new refresh token. + + :param token_url: Provider token refresh endpoint URL. + + :param refresh_token: Refresh token string. + + :param body: Request body (URL encoded string). + + :param scope: List of scopes to request. Must be equal to + or a subset of the scopes granted when obtaining the refresh + token. + + :param kwargs: Additional parameters to included in the request. + + :returns: The prepared request tuple with (url, headers, body). + """ + if not is_secure_transport(token_url): + raise InsecureTransportError() + + self.scope = scope or self.scope + body = self._client.prepare_refresh_body(body=body, + refresh_token=refresh_token, scope=self.scope, **kwargs) + return token_url, FORM_ENC_HEADERS, body + + def prepare_token_revocation_request(self, revocation_url, token, + token_type_hint="access_token", body='', callback=None, **kwargs): + """Prepare a token revocation request. + + :param revocation_url: Provider token revocation endpoint URL. + + :param token: The access or refresh token to be revoked (string). + + :param token_type_hint: ``"access_token"`` (default) or + ``"refresh_token"``. This is optional and if you wish to not pass it you + must provide ``token_type_hint=None``. + + :param callback: A jsonp callback such as ``package.callback`` to be invoked + upon receiving the response. Not that it should not include a () suffix. + + :param kwargs: Additional parameters to included in the request. + + :returns: The prepared request tuple with (url, headers, body). + + Note that JSONP request may use GET requests as the parameters will + be added to the request URL query as opposed to the request body. + + An example of a revocation request + + .. code-block: http + + POST /revoke HTTP/1.1 + Host: server.example.com + Content-Type: application/x-www-form-urlencoded + Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW + + token=45ghiukldjahdnhzdauz&token_type_hint=refresh_token + + An example of a jsonp revocation request + + .. code-block: http + + GET /revoke?token=agabcdefddddafdd&callback=package.myCallback HTTP/1.1 + Host: server.example.com + Content-Type: application/x-www-form-urlencoded + Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW + + and an error response + + .. code-block: http + + package.myCallback({"error":"unsupported_token_type"}); + + Note that these requests usually require client credentials, client_id in + the case for public clients and provider specific authentication + credentials for confidential clients. + """ + if not is_secure_transport(revocation_url): + raise InsecureTransportError() + + return prepare_token_revocation_request(revocation_url, token, + token_type_hint=token_type_hint, body=body, callback=callback, + **kwargs) + + def parse_request_body_response(self, body, scope=None, **kwargs): + """Parse the JSON response body. + + If the access token request is valid and authorized, the + authorization server issues an access token as described in + `Section 5.1`_. A refresh token SHOULD NOT be included. If the request + failed client authentication or is invalid, the authorization server + returns an error response as described in `Section 5.2`_. + + :param body: The response body from the token request. + :param scope: Scopes originally requested. + :return: Dictionary of token parameters. + :raises: Warning if scope has changed. OAuth2Error if response is invalid. + + These response are json encoded and could easily be parsed without + the assistance of OAuthLib. However, there are a few subtle issues + to be aware of regarding the response which are helpfully addressed + through the raising of various errors. + + A successful response should always contain + + **access_token** + The access token issued by the authorization server. Often + a random string. + + **token_type** + The type of the token issued as described in `Section 7.1`_. + Commonly ``Bearer``. + + While it is not mandated it is recommended that the provider include + + **expires_in** + The lifetime in seconds of the access token. For + example, the value "3600" denotes that the access token will + expire in one hour from the time the response was generated. + If omitted, the authorization server SHOULD provide the + expiration time via other means or document the default value. + + **scope** + Providers may supply this in all responses but are required to only + if it has changed since the authorization request. + + .. _`Section 5.1`: http://tools.ietf.org/html/rfc6749#section-5.1 + .. _`Section 5.2`: http://tools.ietf.org/html/rfc6749#section-5.2 + .. _`Section 7.1`: http://tools.ietf.org/html/rfc6749#section-7.1 + """ + self.token = parse_token_response(body, scope=scope) + self._populate_attributes(self.token) + return self.token + + def prepare_refresh_body(self, body='', refresh_token=None, scope=None, **kwargs): + """Prepare an access token request, using a refresh token. + + If the authorization server issued a refresh token to the client, the + client makes a refresh request to the token endpoint by adding the + following parameters using the "application/x-www-form-urlencoded" + format in the HTTP request entity-body: + + grant_type + REQUIRED. Value MUST be set to "refresh_token". + refresh_token + REQUIRED. The refresh token issued to the client. + scope + OPTIONAL. The scope of the access request as described by + Section 3.3. The requested scope MUST NOT include any scope + not originally granted by the resource owner, and if omitted is + treated as equal to the scope originally granted by the + resource owner. + """ + refresh_token = refresh_token or self.refresh_token + return prepare_token_request('refresh_token', body=body, scope=scope, + refresh_token=refresh_token, **kwargs) + + def _add_bearer_token(self, uri, http_method='GET', body=None, + headers=None, token_placement=None): + """Add a bearer token to the request uri, body or authorization header.""" + if token_placement == AUTH_HEADER: + headers = tokens.prepare_bearer_headers(self.access_token, headers) + + elif token_placement == URI_QUERY: + uri = tokens.prepare_bearer_uri(self.access_token, uri) + + elif token_placement == BODY: + body = tokens.prepare_bearer_body(self.access_token, body) + + else: + raise ValueError("Invalid token placement.") + return uri, headers, body + + def _add_mac_token(self, uri, http_method='GET', body=None, + headers=None, token_placement=AUTH_HEADER, ext=None, **kwargs): + """Add a MAC token to the request authorization header. + + Warning: MAC token support is experimental as the spec is not yet stable. + """ + headers = tokens.prepare_mac_header(self.access_token, uri, + self.mac_key, http_method, headers=headers, body=body, ext=ext, + hash_algorithm=self.mac_algorithm, **kwargs) + return uri, headers, body + + def _populate_attributes(self, response): + """Add commonly used values such as access_token to self.""" + + if 'access_token' in response: + self.access_token = response.get('access_token') + + if 'refresh_token' in response: + self.refresh_token = response.get('refresh_token') + + if 'token_type' in response: + self.token_type = response.get('token_type') + + if 'expires_in' in response: + self.expires_in = response.get('expires_in') + self._expires_at = time.time() + int(self.expires_in) + + if 'expires_at' in response: + self._expires_at = int(response.get('expires_at')) + + if 'code' in response: + self.code = response.get('code') + + if 'mac_key' in response: + self.mac_key = response.get('mac_key') + + if 'mac_algorithm' in response: + self.mac_algorithm = response.get('mac_algorithm') + diff --git a/oauthlib/oauth2/rfc6749/clients/legacy_application.py b/oauthlib/oauth2/rfc6749/clients/legacy_application.py new file mode 100644 index 0000000..e4e522a --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/legacy_application.py @@ -0,0 +1,73 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from .base import Client +from ..parameters import prepare_token_request +from ..parameters import parse_token_response + + +class LegacyApplicationClient(Client): + + """A public client using the resource owner password and username directly. + + The resource owner password credentials grant type is suitable in + cases where the resource owner has a trust relationship with the + client, such as the device operating system or a highly privileged + application. The authorization server should take special care when + enabling this grant type, and only allow it when other flows are not + viable. + + The grant type is suitable for clients capable of obtaining the + resource owner's credentials (username and password, typically using + an interactive form). It is also used to migrate existing clients + using direct authentication schemes such as HTTP Basic or Digest + authentication to OAuth by converting the stored credentials to an + access token. + + The method through which the client obtains the resource owner + credentials is beyond the scope of this specification. The client + MUST discard the credentials once an access token has been obtained. + """ + + def __init__(self, client_id, **kwargs): + super(LegacyApplicationClient, self).__init__(client_id, **kwargs) + + def prepare_request_body(self, username, password, body='', scope=None, **kwargs): + """Add the resource owner password and username to the request body. + + The client makes a request to the token endpoint by adding the + following parameters using the "application/x-www-form-urlencoded" + format per `Appendix B`_ in the HTTP request entity-body: + + :param username: The resource owner username. + :param password: The resource owner password. + :param scope: The scope of the access request as described by + `Section 3.3`_. + :param kwargs: Extra credentials to include in the token request. + + If the client type is confidential or the client was issued client + credentials (or assigned other authentication requirements), the + client MUST authenticate with the authorization server as described + in `Section 3.2.1`_. + + The prepared body will include all provided credentials as well as + the ``grant_type`` parameter set to ``password``:: + + >>> from oauthlib.oauth2 import LegacyApplicationClient + >>> client = LegacyApplicationClient('your_id') + >>> client.prepare_request_body(username='foo', password='bar', scope=['hello', 'world']) + 'grant_type=password&username=foo&scope=hello+world&password=bar' + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 3.2.1`: http://tools.ietf.org/html/rfc6749#section-3.2.1 + """ + return prepare_token_request('password', body=body, username=username, + password=password, scope=scope, **kwargs) diff --git a/oauthlib/oauth2/rfc6749/clients/mobile_application.py b/oauthlib/oauth2/rfc6749/clients/mobile_application.py new file mode 100644 index 0000000..9e3ef21 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/mobile_application.py @@ -0,0 +1,173 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from .base import Client +from ..parameters import prepare_grant_uri +from ..parameters import parse_implicit_response + + +class MobileApplicationClient(Client): + + """A public client utilizing the implicit code grant workflow. + + A user-agent-based application is a public client in which the + client code is downloaded from a web server and executes within a + user-agent (e.g. web browser) on the device used by the resource + owner. Protocol data and credentials are easily accessible (and + often visible) to the resource owner. Since such applications + reside within the user-agent, they can make seamless use of the + user-agent capabilities when requesting authorization. + + The implicit grant type is used to obtain access tokens (it does not + support the issuance of refresh tokens) and is optimized for public + clients known to operate a particular redirection URI. These clients + are typically implemented in a browser using a scripting language + such as JavaScript. + + As a redirection-based flow, the client must be capable of + interacting with the resource owner's user-agent (typically a web + browser) and capable of receiving incoming requests (via redirection) + from the authorization server. + + Unlike the authorization code grant type in which the client makes + separate requests for authorization and access token, the client + receives the access token as the result of the authorization request. + + The implicit grant type does not include client authentication, and + relies on the presence of the resource owner and the registration of + the redirection URI. Because the access token is encoded into the + redirection URI, it may be exposed to the resource owner and other + applications residing on the same device. + """ + + def prepare_request_uri(self, uri, redirect_uri=None, scope=None, + state=None, **kwargs): + """Prepare the implicit grant request URI. + + The client constructs the request URI by adding the following + parameters to the query component of the authorization endpoint URI + using the "application/x-www-form-urlencoded" format, per `Appendix B`_: + + :param redirect_uri: OPTIONAL. The redirect URI must be an absolute URI + and it should have been registerd with the OAuth + provider prior to use. As described in `Section 3.1.2`_. + + :param scope: OPTIONAL. The scope of the access request as described by + Section 3.3`_. These may be any string but are commonly + URIs or various categories such as ``videos`` or ``documents``. + + :param state: RECOMMENDED. An opaque value used by the client to maintain + state between the request and callback. The authorization + server includes this value when redirecting the user-agent back + to the client. The parameter SHOULD be used for preventing + cross-site request forgery as described in `Section 10.12`_. + + :param kwargs: Extra arguments to include in the request URI. + + In addition to supplied parameters, OAuthLib will append the ``client_id`` + that was provided in the constructor as well as the mandatory ``response_type`` + argument, set to ``token``:: + + >>> from oauthlib.oauth2 import MobileApplicationClient + >>> client = MobileApplicationClient('your_id') + >>> client.prepare_request_uri('https://example.com') + 'https://example.com?client_id=your_id&response_type=token' + >>> client.prepare_request_uri('https://example.com', redirect_uri='https://a.b/callback') + 'https://example.com?client_id=your_id&response_type=token&redirect_uri=https%3A%2F%2Fa.b%2Fcallback' + >>> client.prepare_request_uri('https://example.com', scope=['profile', 'pictures']) + 'https://example.com?client_id=your_id&response_type=token&scope=profile+pictures' + >>> client.prepare_request_uri('https://example.com', foo='bar') + 'https://example.com?client_id=your_id&response_type=token&foo=bar' + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + .. _`Section 2.2`: http://tools.ietf.org/html/rfc6749#section-2.2 + .. _`Section 3.1.2`: http://tools.ietf.org/html/rfc6749#section-3.1.2 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 10.12`: http://tools.ietf.org/html/rfc6749#section-10.12 + """ + return prepare_grant_uri(uri, self.client_id, 'token', + redirect_uri=redirect_uri, state=state, scope=scope, **kwargs) + + def parse_request_uri_response(self, uri, state=None, scope=None): + """Parse the response URI fragment. + + If the resource owner grants the access request, the authorization + server issues an access token and delivers it to the client by adding + the following parameters to the fragment component of the redirection + URI using the "application/x-www-form-urlencoded" format: + + :param uri: The callback URI that resulted from the user being redirected + back from the provider to you, the client. + :param state: The state provided in the authorization request. + :param scope: The scopes provided in the authorization request. + :return: Dictionary of token parameters. + :raises: OAuth2Error if response is invalid. + + A successful response should always contain + + **access_token** + The access token issued by the authorization server. Often + a random string. + + **token_type** + The type of the token issued as described in `Section 7.1`_. + Commonly ``Bearer``. + + **state** + If you provided the state parameter in the authorization phase, then + the provider is required to include that exact state value in the + response. + + While it is not mandated it is recommended that the provider include + + **expires_in** + The lifetime in seconds of the access token. For + example, the value "3600" denotes that the access token will + expire in one hour from the time the response was generated. + If omitted, the authorization server SHOULD provide the + expiration time via other means or document the default value. + + **scope** + Providers may supply this in all responses but are required to only + if it has changed since the authorization request. + + A few example responses can be seen below:: + + >>> response_uri = 'https://example.com/callback#access_token=sdlfkj452&state=ss345asyht&token_type=Bearer&scope=hello+world' + >>> from oauthlib.oauth2 import MobileApplicationClient + >>> client = MobileApplicationClient('your_id') + >>> client.parse_request_uri_response(response_uri) + { + 'access_token': 'sdlfkj452', + 'token_type': 'Bearer', + 'state': 'ss345asyht', + 'scope': [u'hello', u'world'] + } + >>> client.parse_request_uri_response(response_uri, state='other') + Traceback (most recent call last): + File "", line 1, in + File "oauthlib/oauth2/rfc6749/__init__.py", line 598, in parse_request_uri_response + **scope** + File "oauthlib/oauth2/rfc6749/parameters.py", line 197, in parse_implicit_response + raise ValueError("Mismatching or missing state in params.") + ValueError: Mismatching or missing state in params. + >>> def alert_scope_changed(message, old, new): + ... print(message, old, new) + ... + >>> oauthlib.signals.scope_changed.connect(alert_scope_changed) + >>> client.parse_request_body_response(response_body, scope=['other']) + ('Scope has changed from "other" to "hello world".', ['other'], ['hello', 'world']) + + .. _`Section 7.1`: http://tools.ietf.org/html/rfc6749#section-7.1 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + """ + self.token = parse_implicit_response(uri, state=state, scope=scope) + self._populate_attributes(self.token) + return self.token diff --git a/oauthlib/oauth2/rfc6749/clients/service_application.py b/oauthlib/oauth2/rfc6749/clients/service_application.py new file mode 100644 index 0000000..36da98b --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/service_application.py @@ -0,0 +1,176 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import time + +from oauthlib.common import to_unicode + +from .base import Client +from ..parameters import prepare_token_request +from ..parameters import parse_token_response + + +class ServiceApplicationClient(Client): + """A public client utilizing the JWT bearer grant. + + JWT bearer tokes can be used to request an access token when a client + wishes to utilize an existing trust relationship, expressed through the + semantics of (and digital signature or keyed message digest calculated + over) the JWT, without a direct user approval step at the authorization + server. + + This grant type does not involve an authorization step. It may be + used by both public and confidential clients. + """ + + grant_type = 'urn:ietf:params:oauth:grant-type:jwt-bearer' + + def __init__(self, client_id, private_key=None, subject=None, issuer=None, + audience=None, **kwargs): + """Initalize a JWT client with defaults for implicit use later. + + :param client_id: Client identifier given by the OAuth provider upon + registration. + + :param private_key: Private key used for signing and encrypting. + Must be given as a string. + + :param subject: The principal that is the subject of the JWT, i.e. + which user is the token requested on behalf of. + For example, ``foo@example.com. + + :param issuer: The JWT MUST contain an "iss" (issuer) claim that + contains a unique identifier for the entity that issued + the JWT. For example, ``your-client@provider.com``. + + :param audience: A value identifying the authorization server as an + intended audience, e.g. + ``https://provider.com/oauth2/token``. + + :param kwargs: Additional arguments to pass to base client, such as + state and token. See Client.__init__.__doc__ for + details. + """ + super(ServiceApplicationClient, self).__init__(client_id, **kwargs) + self.private_key = private_key + self.subject = subject + self.issuer = issuer + self.audience = audience + + def prepare_request_body(self, + private_key=None, + subject=None, + issuer=None, + audience=None, + expires_at=None, + issued_at=None, + extra_claims=None, + body='', + scope=None, + **kwargs): + """Create and add a JWT assertion to the request body. + + :param private_key: Private key used for signing and encrypting. + Must be given as a string. + + :param subject: (sub) The principal that is the subject of the JWT, + i.e. which user is the token requested on behalf of. + For example, ``foo@example.com. + + :param issuer: (iss) The JWT MUST contain an "iss" (issuer) claim that + contains a unique identifier for the entity that issued + the JWT. For example, ``your-client@provider.com``. + + :param audience: (aud) A value identifying the authorization server as an + intended audience, e.g. + ``https://provider.com/oauth2/token``. + + :param expires_at: A unix expiration timestamp for the JWT. Defaults + to an hour from now, i.e. ``time.time() + 3600``. + + :param issued_at: A unix timestamp of when the JWT was created. + Defaults to now, i.e. ``time.time()``. + + :param not_before: A unix timestamp after which the JWT may be used. + Not included unless provided. + + :param jwt_id: A unique JWT token identifier. Not included unless + provided. + + :param extra_claims: A dict of additional claims to include in the JWT. + + :param scope: The scope of the access request. + + :param body: Request body (string) with extra parameters. + + :param kwargs: Extra credentials to include in the token request. + + The "scope" parameter may be used, as defined in the Assertion + Framework for OAuth 2.0 Client Authentication and Authorization Grants + [I-D.ietf-oauth-assertions] specification, to indicate the requested + scope. + + Authentication of the client is optional, as described in + `Section 3.2.1`_ of OAuth 2.0 [RFC6749] and consequently, the + "client_id" is only needed when a form of client authentication that + relies on the parameter is used. + + The following non-normative example demonstrates an Access Token + Request with a JWT as an authorization grant (with extra line breaks + for display purposes only): + + .. code-block: http + + POST /token.oauth2 HTTP/1.1 + Host: as.example.com + Content-Type: application/x-www-form-urlencoded + + grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer + &assertion=eyJhbGciOiJFUzI1NiJ9. + eyJpc3Mi[...omitted for brevity...]. + J9l-ZhwP[...omitted for brevity...] + + .. _`Section 3.2.1`: http://tools.ietf.org/html/rfc6749#section-3.2.1 + """ + import jwt + + key = private_key or self.private_key + if not key: + raise ValueError('An encryption key must be supplied to make JWT' + ' token requests.') + claim = { + 'iss': issuer or self.issuer, + 'aud': audience or self.issuer, + 'sub': subject or self.issuer, + 'exp': int(expires_at or time.time() + 3600), + 'iat': int(issued_at or time.time()), + } + + for attr in ('iss', 'aud', 'sub'): + if claim[attr] is None: + raise ValueError( + 'Claim must include %s but none was given.' % attr) + + if 'not_before' in kwargs: + claim['nbf'] = kwargs.pop('not_before') + + if 'jwt_id' in kwargs: + claim['jti'] = kwargs.pop('jwt_id') + + claim.update(extra_claims or {}) + + assertion = jwt.encode(claim, key, 'RS256') + assertion = to_unicode(assertion) + + return prepare_token_request(self.grant_type, + body=body, + assertion=assertion, + scope=scope, + **kwargs) diff --git a/oauthlib/oauth2/rfc6749/clients/web_application.py b/oauthlib/oauth2/rfc6749/clients/web_application.py new file mode 100644 index 0000000..c685d3c --- /dev/null +++ b/oauthlib/oauth2/rfc6749/clients/web_application.py @@ -0,0 +1,176 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from .base import Client +from ..parameters import prepare_grant_uri, prepare_token_request +from ..parameters import parse_authorization_code_response +from ..parameters import parse_token_response + + +class WebApplicationClient(Client): + + """A client utilizing the authorization code grant workflow. + + A web application is a confidential client running on a web + server. Resource owners access the client via an HTML user + interface rendered in a user-agent on the device used by the + resource owner. The client credentials as well as any access + token issued to the client are stored on the web server and are + not exposed to or accessible by the resource owner. + + The authorization code grant type is used to obtain both access + tokens and refresh tokens and is optimized for confidential clients. + As a redirection-based flow, the client must be capable of + interacting with the resource owner's user-agent (typically a web + browser) and capable of receiving incoming requests (via redirection) + from the authorization server. + """ + + def __init__(self, client_id, code=None, **kwargs): + super(WebApplicationClient, self).__init__(client_id, **kwargs) + self.code = code + + def prepare_request_uri(self, uri, redirect_uri=None, scope=None, + state=None, **kwargs): + """Prepare the authorization code request URI + + The client constructs the request URI by adding the following + parameters to the query component of the authorization endpoint URI + using the "application/x-www-form-urlencoded" format, per `Appendix B`_: + + :param redirect_uri: OPTIONAL. The redirect URI must be an absolute URI + and it should have been registerd with the OAuth + provider prior to use. As described in `Section 3.1.2`_. + + :param scope: OPTIONAL. The scope of the access request as described by + Section 3.3`_. These may be any string but are commonly + URIs or various categories such as ``videos`` or ``documents``. + + :param state: RECOMMENDED. An opaque value used by the client to maintain + state between the request and callback. The authorization + server includes this value when redirecting the user-agent back + to the client. The parameter SHOULD be used for preventing + cross-site request forgery as described in `Section 10.12`_. + + :param kwargs: Extra arguments to include in the request URI. + + In addition to supplied parameters, OAuthLib will append the ``client_id`` + that was provided in the constructor as well as the mandatory ``response_type`` + argument, set to ``code``:: + + >>> from oauthlib.oauth2 import WebApplicationClient + >>> client = WebApplicationClient('your_id') + >>> client.prepare_request_uri('https://example.com') + 'https://example.com?client_id=your_id&response_type=code' + >>> client.prepare_request_uri('https://example.com', redirect_uri='https://a.b/callback') + 'https://example.com?client_id=your_id&response_type=code&redirect_uri=https%3A%2F%2Fa.b%2Fcallback' + >>> client.prepare_request_uri('https://example.com', scope=['profile', 'pictures']) + 'https://example.com?client_id=your_id&response_type=code&scope=profile+pictures' + >>> client.prepare_request_uri('https://example.com', foo='bar') + 'https://example.com?client_id=your_id&response_type=code&foo=bar' + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + .. _`Section 2.2`: http://tools.ietf.org/html/rfc6749#section-2.2 + .. _`Section 3.1.2`: http://tools.ietf.org/html/rfc6749#section-3.1.2 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 10.12`: http://tools.ietf.org/html/rfc6749#section-10.12 + """ + return prepare_grant_uri(uri, self.client_id, 'code', + redirect_uri=redirect_uri, scope=scope, state=state, **kwargs) + + def prepare_request_body(self, client_id=None, code=None, body='', + redirect_uri=None, **kwargs): + """Prepare the access token request body. + + The client makes a request to the token endpoint by adding the + following parameters using the "application/x-www-form-urlencoded" + format in the HTTP request entity-body: + + :param client_id: REQUIRED, if the client is not authenticating with the + authorization server as described in `Section 3.2.1`_. + + :param code: REQUIRED. The authorization code received from the + authorization server. + + :param redirect_uri: REQUIRED, if the "redirect_uri" parameter was included in the + authorization request as described in `Section 4.1.1`_, and their + values MUST be identical. + + :param kwargs: Extra parameters to include in the token request. + + In addition OAuthLib will add the ``grant_type`` parameter set to + ``authorization_code``. + + If the client type is confidential or the client was issued client + credentials (or assigned other authentication requirements), the + client MUST authenticate with the authorization server as described + in `Section 3.2.1`_:: + + >>> from oauthlib.oauth2 import WebApplicationClient + >>> client = WebApplicationClient('your_id') + >>> client.prepare_request_body(code='sh35ksdf09sf') + 'grant_type=authorization_code&code=sh35ksdf09sf' + >>> client.prepare_request_body(code='sh35ksdf09sf', foo='bar') + 'grant_type=authorization_code&code=sh35ksdf09sf&foo=bar' + + .. _`Section 4.1.1`: http://tools.ietf.org/html/rfc6749#section-4.1.1 + .. _`Section 3.2.1`: http://tools.ietf.org/html/rfc6749#section-3.2.1 + """ + code = code or self.code + return prepare_token_request('authorization_code', code=code, body=body, + client_id=self.client_id, redirect_uri=redirect_uri, **kwargs) + + def parse_request_uri_response(self, uri, state=None): + """Parse the URI query for code and state. + + If the resource owner grants the access request, the authorization + server issues an authorization code and delivers it to the client by + adding the following parameters to the query component of the + redirection URI using the "application/x-www-form-urlencoded" format: + + :param uri: The callback URI that resulted from the user being redirected + back from the provider to you, the client. + :param state: The state provided in the authorization request. + + **code** + The authorization code generated by the authorization server. + The authorization code MUST expire shortly after it is issued + to mitigate the risk of leaks. A maximum authorization code + lifetime of 10 minutes is RECOMMENDED. The client MUST NOT + use the authorization code more than once. If an authorization + code is used more than once, the authorization server MUST deny + the request and SHOULD revoke (when possible) all tokens + previously issued based on that authorization code. + The authorization code is bound to the client identifier and + redirection URI. + + **state** + If the "state" parameter was present in the authorization request. + + This method is mainly intended to enforce strict state checking with + the added benefit of easily extracting parameters from the URI:: + + >>> from oauthlib.oauth2 import WebApplicationClient + >>> client = WebApplicationClient('your_id') + >>> uri = 'https://example.com/callback?code=sdfkjh345&state=sfetw45' + >>> client.parse_request_uri_response(uri, state='sfetw45') + {'state': 'sfetw45', 'code': 'sdfkjh345'} + >>> client.parse_request_uri_response(uri, state='other') + Traceback (most recent call last): + File "", line 1, in + File "oauthlib/oauth2/rfc6749/__init__.py", line 357, in parse_request_uri_response + back from the provider to you, the client. + File "oauthlib/oauth2/rfc6749/parameters.py", line 153, in parse_authorization_code_response + raise MismatchingStateError() + oauthlib.oauth2.rfc6749.errors.MismatchingStateError + """ + response = parse_authorization_code_response(uri, state=state) + self._populate_attributes(response) + return response diff --git a/oauthlib/oauth2/rfc6749/endpoints/__init__.py b/oauthlib/oauth2/rfc6749/endpoints/__init__.py new file mode 100644 index 0000000..848bec6 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/__init__.py @@ -0,0 +1,19 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from .authorization import AuthorizationEndpoint +from .token import TokenEndpoint +from .resource import ResourceEndpoint +from .revocation import RevocationEndpoint +from .pre_configured import Server +from .pre_configured import WebApplicationServer +from .pre_configured import MobileApplicationServer +from .pre_configured import LegacyApplicationServer +from .pre_configured import BackendApplicationServer diff --git a/oauthlib/oauth2/rfc6749/endpoints/authorization.py b/oauthlib/oauth2/rfc6749/endpoints/authorization.py new file mode 100644 index 0000000..ada24d7 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/authorization.py @@ -0,0 +1,114 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from oauthlib.common import Request + +from .base import BaseEndpoint, catch_errors_and_unavailability + +log = logging.getLogger(__name__) + + +class AuthorizationEndpoint(BaseEndpoint): + + """Authorization endpoint - used by the client to obtain authorization + from the resource owner via user-agent redirection. + + The authorization endpoint is used to interact with the resource + owner and obtain an authorization grant. The authorization server + MUST first verify the identity of the resource owner. The way in + which the authorization server authenticates the resource owner (e.g. + username and password login, session cookies) is beyond the scope of + this specification. + + The endpoint URI MAY include an "application/x-www-form-urlencoded" + formatted (per `Appendix B`_) query component, + which MUST be retained when adding additional query parameters. The + endpoint URI MUST NOT include a fragment component:: + + https://example.com/path?query=component # OK + https://example.com/path?query=component#fragment # Not OK + + Since requests to the authorization endpoint result in user + authentication and the transmission of clear-text credentials (in the + HTTP response), the authorization server MUST require the use of TLS + as described in Section 1.6 when sending requests to the + authorization endpoint:: + + # We will deny any request which URI schema is not with https + + The authorization server MUST support the use of the HTTP "GET" + method [RFC2616] for the authorization endpoint, and MAY support the + use of the "POST" method as well:: + + # HTTP method is currently not enforced + + Parameters sent without a value MUST be treated as if they were + omitted from the request. The authorization server MUST ignore + unrecognized request parameters. Request and response parameters + MUST NOT be included more than once:: + + # Enforced through the design of oauthlib.common.Request + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + """ + + def __init__(self, default_response_type, default_token_type, + response_types): + BaseEndpoint.__init__(self) + self._response_types = response_types + self._default_response_type = default_response_type + self._default_token_type = default_token_type + + @property + def response_types(self): + return self._response_types + + @property + def default_response_type(self): + return self._default_response_type + + @property + def default_response_type_handler(self): + return self.response_types.get(self.default_response_type) + + @property + def default_token_type(self): + return self._default_token_type + + @catch_errors_and_unavailability + def create_authorization_response(self, uri, http_method='GET', body=None, + headers=None, scopes=None, credentials=None): + """Extract response_type and route to the designated handler.""" + request = Request( + uri, http_method=http_method, body=body, headers=headers) + request.scopes = scopes + # TODO: decide whether this should be a required argument + request.user = None # TODO: explain this in docs + for k, v in (credentials or {}).items(): + setattr(request, k, v) + response_type_handler = self.response_types.get( + request.response_type, self.default_response_type_handler) + log.debug('Dispatching response_type %s request to %r.', + request.response_type, response_type_handler) + return response_type_handler.create_authorization_response( + request, self.default_token_type) + + @catch_errors_and_unavailability + def validate_authorization_request(self, uri, http_method='GET', body=None, + headers=None): + """Extract response_type and route to the designated handler.""" + request = Request( + uri, http_method=http_method, body=body, headers=headers) + request.scopes = None + response_type_handler = self.response_types.get( + request.response_type, self.default_response_type_handler) + return response_type_handler.validate_authorization_request(request) diff --git a/oauthlib/oauth2/rfc6749/endpoints/base.py b/oauthlib/oauth2/rfc6749/endpoints/base.py new file mode 100644 index 0000000..759c6c8 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/base.py @@ -0,0 +1,65 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import functools +import logging + +from ..errors import TemporarilyUnavailableError, ServerError +from ..errors import FatalClientError, OAuth2Error + +log = logging.getLogger(__name__) + + +class BaseEndpoint(object): + + def __init__(self): + self._available = True + self._catch_errors = False + + @property + def available(self): + return self._available + + @available.setter + def available(self, available): + self._available = available + + @property + def catch_errors(self): + return self._catch_errors + + @catch_errors.setter + def catch_errors(self, catch_errors): + self._catch_errors = catch_errors + + +def catch_errors_and_unavailability(f): + @functools.wraps(f) + def wrapper(endpoint, uri, *args, **kwargs): + if not endpoint.available: + e = TemporarilyUnavailableError() + log.info('Endpoint unavailable, ignoring request %s.' % uri) + return {}, e.json, 503 + + if endpoint.catch_errors: + try: + return f(endpoint, uri, *args, **kwargs) + except OAuth2Error: + raise + except FatalClientError: + raise + except Exception as e: + error = ServerError() + log.warning( + 'Exception caught while processing request, %s.' % e) + return {}, error.json, 500 + else: + return f(endpoint, uri, *args, **kwargs) + return wrapper diff --git a/oauthlib/oauth2/rfc6749/endpoints/pre_configured.py b/oauthlib/oauth2/rfc6749/endpoints/pre_configured.py new file mode 100644 index 0000000..21ed2dd --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/pre_configured.py @@ -0,0 +1,209 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +from ..tokens import BearerToken +from ..grant_types import AuthorizationCodeGrant +from ..grant_types import ImplicitGrant +from ..grant_types import ResourceOwnerPasswordCredentialsGrant +from ..grant_types import ClientCredentialsGrant +from ..grant_types import RefreshTokenGrant + +from .authorization import AuthorizationEndpoint +from .token import TokenEndpoint +from .resource import ResourceEndpoint +from .revocation import RevocationEndpoint + + +class Server(AuthorizationEndpoint, TokenEndpoint, ResourceEndpoint, + RevocationEndpoint): + + """An all-in-one endpoint featuring all four major grant types.""" + + def __init__(self, request_validator, token_expires_in=None, + token_generator=None, refresh_token_generator=None, + *args, **kwargs): + """Construct a new all-grants-in-one server. + + :param request_validator: An implementation of + oauthlib.oauth2.RequestValidator. + :param token_expires_in: An int or a function to generate a token + expiration offset (in seconds) given a + oauthlib.common.Request object. + :param token_generator: A function to generate a token from a request. + :param refresh_token_generator: A function to generate a token from a + request for the refresh token. + :param kwargs: Extra parameters to pass to authorization-, + token-, resource-, and revocation-endpoint constructors. + """ + auth_grant = AuthorizationCodeGrant(request_validator) + implicit_grant = ImplicitGrant(request_validator) + password_grant = ResourceOwnerPasswordCredentialsGrant( + request_validator) + credentials_grant = ClientCredentialsGrant(request_validator) + refresh_grant = RefreshTokenGrant(request_validator) + bearer = BearerToken(request_validator, token_generator, + token_expires_in, refresh_token_generator) + AuthorizationEndpoint.__init__(self, default_response_type='code', + response_types={ + 'code': auth_grant, + 'token': implicit_grant, + }, + default_token_type=bearer) + TokenEndpoint.__init__(self, default_grant_type='authorization_code', + grant_types={ + 'authorization_code': auth_grant, + 'password': password_grant, + 'client_credentials': credentials_grant, + 'refresh_token': refresh_grant, + }, + default_token_type=bearer) + ResourceEndpoint.__init__(self, default_token='Bearer', + token_types={'Bearer': bearer}) + RevocationEndpoint.__init__(self, request_validator) + + +class WebApplicationServer(AuthorizationEndpoint, TokenEndpoint, ResourceEndpoint, + RevocationEndpoint): + + """An all-in-one endpoint featuring Authorization code grant and Bearer tokens.""" + + def __init__(self, request_validator, token_generator=None, + token_expires_in=None, refresh_token_generator=None, **kwargs): + """Construct a new web application server. + + :param request_validator: An implementation of + oauthlib.oauth2.RequestValidator. + :param token_expires_in: An int or a function to generate a token + expiration offset (in seconds) given a + oauthlib.common.Request object. + :param token_generator: A function to generate a token from a request. + :param refresh_token_generator: A function to generate a token from a + request for the refresh token. + :param kwargs: Extra parameters to pass to authorization-, + token-, resource-, and revocation-endpoint constructors. + """ + auth_grant = AuthorizationCodeGrant(request_validator) + refresh_grant = RefreshTokenGrant(request_validator) + bearer = BearerToken(request_validator, token_generator, + token_expires_in, refresh_token_generator) + AuthorizationEndpoint.__init__(self, default_response_type='code', + response_types={'code': auth_grant}, + default_token_type=bearer) + TokenEndpoint.__init__(self, default_grant_type='authorization_code', + grant_types={ + 'authorization_code': auth_grant, + 'refresh_token': refresh_grant, + }, + default_token_type=bearer) + ResourceEndpoint.__init__(self, default_token='Bearer', + token_types={'Bearer': bearer}) + RevocationEndpoint.__init__(self, request_validator) + + +class MobileApplicationServer(AuthorizationEndpoint, ResourceEndpoint, + RevocationEndpoint): + + """An all-in-one endpoint featuring Implicit code grant and Bearer tokens.""" + + def __init__(self, request_validator, token_generator=None, + token_expires_in=None, refresh_token_generator=None, **kwargs): + """Construct a new implicit grant server. + + :param request_validator: An implementation of + oauthlib.oauth2.RequestValidator. + :param token_expires_in: An int or a function to generate a token + expiration offset (in seconds) given a + oauthlib.common.Request object. + :param token_generator: A function to generate a token from a request. + :param refresh_token_generator: A function to generate a token from a + request for the refresh token. + :param kwargs: Extra parameters to pass to authorization-, + token-, resource-, and revocation-endpoint constructors. + """ + implicit_grant = ImplicitGrant(request_validator) + bearer = BearerToken(request_validator, token_generator, + token_expires_in, refresh_token_generator) + AuthorizationEndpoint.__init__(self, default_response_type='token', + response_types={ + 'token': implicit_grant}, + default_token_type=bearer) + ResourceEndpoint.__init__(self, default_token='Bearer', + token_types={'Bearer': bearer}) + RevocationEndpoint.__init__(self, request_validator, + supported_token_types=['access_token']) + + +class LegacyApplicationServer(TokenEndpoint, ResourceEndpoint, + RevocationEndpoint): + + """An all-in-one endpoint featuring Resource Owner Password Credentials grant and Bearer tokens.""" + + def __init__(self, request_validator, token_generator=None, + token_expires_in=None, refresh_token_generator=None, **kwargs): + """Construct a resource owner password credentials grant server. + + :param request_validator: An implementation of + oauthlib.oauth2.RequestValidator. + :param token_expires_in: An int or a function to generate a token + expiration offset (in seconds) given a + oauthlib.common.Request object. + :param token_generator: A function to generate a token from a request. + :param refresh_token_generator: A function to generate a token from a + request for the refresh token. + :param kwargs: Extra parameters to pass to authorization-, + token-, resource-, and revocation-endpoint constructors. + """ + password_grant = ResourceOwnerPasswordCredentialsGrant( + request_validator) + refresh_grant = RefreshTokenGrant(request_validator) + bearer = BearerToken(request_validator, token_generator, + token_expires_in, refresh_token_generator) + TokenEndpoint.__init__(self, default_grant_type='password', + grant_types={ + 'password': password_grant, + 'refresh_token': refresh_grant, + }, + default_token_type=bearer) + ResourceEndpoint.__init__(self, default_token='Bearer', + token_types={'Bearer': bearer}) + RevocationEndpoint.__init__(self, request_validator) + + +class BackendApplicationServer(TokenEndpoint, ResourceEndpoint, + RevocationEndpoint): + + """An all-in-one endpoint featuring Client Credentials grant and Bearer tokens.""" + + def __init__(self, request_validator, token_generator=None, + token_expires_in=None, refresh_token_generator=None, **kwargs): + """Construct a client credentials grant server. + + :param request_validator: An implementation of + oauthlib.oauth2.RequestValidator. + :param token_expires_in: An int or a function to generate a token + expiration offset (in seconds) given a + oauthlib.common.Request object. + :param token_generator: A function to generate a token from a request. + :param refresh_token_generator: A function to generate a token from a + request for the refresh token. + :param kwargs: Extra parameters to pass to authorization-, + token-, resource-, and revocation-endpoint constructors. + """ + credentials_grant = ClientCredentialsGrant(request_validator) + bearer = BearerToken(request_validator, token_generator, + token_expires_in, refresh_token_generator) + TokenEndpoint.__init__(self, default_grant_type='client_credentials', + grant_types={ + 'client_credentials': credentials_grant}, + default_token_type=bearer) + ResourceEndpoint.__init__(self, default_token='Bearer', + token_types={'Bearer': bearer}) + RevocationEndpoint.__init__(self, request_validator, + supported_token_types=['access_token']) diff --git a/oauthlib/oauth2/rfc6749/endpoints/resource.py b/oauthlib/oauth2/rfc6749/endpoints/resource.py new file mode 100644 index 0000000..d03ed21 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/resource.py @@ -0,0 +1,87 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from oauthlib.common import Request + +from .base import BaseEndpoint, catch_errors_and_unavailability + +log = logging.getLogger(__name__) + + +class ResourceEndpoint(BaseEndpoint): + + """Authorizes access to protected resources. + + The client accesses protected resources by presenting the access + token to the resource server. The resource server MUST validate the + access token and ensure that it has not expired and that its scope + covers the requested resource. The methods used by the resource + server to validate the access token (as well as any error responses) + are beyond the scope of this specification but generally involve an + interaction or coordination between the resource server and the + authorization server:: + + # For most cases, returning a 403 should suffice. + + The method in which the client utilizes the access token to + authenticate with the resource server depends on the type of access + token issued by the authorization server. Typically, it involves + using the HTTP "Authorization" request header field [RFC2617] with an + authentication scheme defined by the specification of the access + token type used, such as [RFC6750]:: + + # Access tokens may also be provided in query and body + https://example.com/protected?access_token=kjfch2345sdf # Query + access_token=sdf23409df # Body + """ + + def __init__(self, default_token, token_types): + BaseEndpoint.__init__(self) + self._tokens = token_types + self._default_token = default_token + + @property + def default_token(self): + return self._default_token + + @property + def default_token_type_handler(self): + return self.tokens.get(self.default_token) + + @property + def tokens(self): + return self._tokens + + @catch_errors_and_unavailability + def verify_request(self, uri, http_method='GET', body=None, headers=None, + scopes=None): + """Validate client, code etc, return body + headers""" + request = Request(uri, http_method, body, headers) + request.token_type = self.find_token_type(request) + request.scopes = scopes + token_type_handler = self.tokens.get(request.token_type, + self.default_token_type_handler) + log.debug('Dispatching token_type %s request to %r.', + request.token_type, token_type_handler) + return token_type_handler.validate_request(request), request + + def find_token_type(self, request): + """Token type identification. + + RFC 6749 does not provide a method for easily differentiating between + different token types during protected resource access. We estimate + the most likely token type (if any) by asking each known token type + to give an estimation based on the request. + """ + estimates = sorted(((t.estimate_type(request), n) + for n, t in self.tokens.items())) + return estimates[0][1] if len(estimates) else None diff --git a/oauthlib/oauth2/rfc6749/endpoints/revocation.py b/oauthlib/oauth2/rfc6749/endpoints/revocation.py new file mode 100644 index 0000000..b73131c --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/revocation.py @@ -0,0 +1,129 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.endpoint.revocation +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +An implementation of the OAuth 2 `Token Revocation`_ spec (draft 11). + +.. _`Token Revocation`: http://tools.ietf.org/html/draft-ietf-oauth-revocation-11 +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from oauthlib.common import Request + +from .base import BaseEndpoint, catch_errors_and_unavailability +from ..errors import InvalidClientError, UnsupportedTokenTypeError +from ..errors import InvalidRequestError, OAuth2Error + +log = logging.getLogger(__name__) + + +class RevocationEndpoint(BaseEndpoint): + + """Token revocation endpoint. + + Endpoint used by authenticated clients to revoke access and refresh tokens. + Commonly this will be part of the Authorization Endpoint. + """ + + valid_token_types = ('access_token', 'refresh_token') + + def __init__(self, request_validator, supported_token_types=None, + enable_jsonp=False): + BaseEndpoint.__init__(self) + self.request_validator = request_validator + self.supported_token_types = ( + supported_token_types or self.valid_token_types) + self.enable_jsonp = enable_jsonp + + @catch_errors_and_unavailability + def create_revocation_response(self, uri, http_method='POST', body=None, + headers=None): + """Revoke supplied access or refresh token. + + + The authorization server responds with HTTP status code 200 if the + token has been revoked sucessfully or if the client submitted an + invalid token. + + Note: invalid tokens do not cause an error response since the client + cannot handle such an error in a reasonable way. Moreover, the purpose + of the revocation request, invalidating the particular token, is + already achieved. + + The content of the response body is ignored by the client as all + necessary information is conveyed in the response code. + + An invalid token type hint value is ignored by the authorization server + and does not influence the revocation response. + """ + request = Request( + uri, http_method=http_method, body=body, headers=headers) + try: + self.validate_revocation_request(request) + log.debug('Token revocation valid for %r.', request) + except OAuth2Error as e: + log.debug('Client error during validation of %r. %r.', request, e) + response_body = e.json + if self.enable_jsonp and request.callback: + response_body = '%s(%s);' % (request.callback, response_body) + return {}, response_body, e.status_code + + self.request_validator.revoke_token(request.token, + request.token_type_hint, request) + + response_body = None + if self.enable_jsonp and request.callback: + response_body = request.callback + '();' + return {}, response_body, 200 + + def validate_revocation_request(self, request): + """Ensure the request is valid. + + The client constructs the request by including the following parameters + using the "application/x-www-form-urlencoded" format in the HTTP + request entity-body: + + token (REQUIRED). The token that the client wants to get revoked. + + token_type_hint (OPTIONAL). A hint about the type of the token + submitted for revocation. Clients MAY pass this parameter in order to + help the authorization server to optimize the token lookup. If the + server is unable to locate the token using the given hint, it MUST + extend its search accross all of its supported token types. An + authorization server MAY ignore this parameter, particularly if it is + able to detect the token type automatically. This specification + defines two such values: + + * access_token: An Access Token as defined in [RFC6749], + `section 1.4`_ + + * refresh_token: A Refresh Token as defined in [RFC6749], + `section 1.5`_ + + Specific implementations, profiles, and extensions of this + specification MAY define other values for this parameter using + the registry defined in `Section 4.1.2`_. + + The client also includes its authentication credentials as described in + `Section 2.3`_. of [`RFC6749`_]. + + .. _`section 1.4`: http://tools.ietf.org/html/rfc6749#section-1.4 + .. _`section 1.5`: http://tools.ietf.org/html/rfc6749#section-1.5 + .. _`section 2.3`: http://tools.ietf.org/html/rfc6749#section-2.3 + .. _`Section 4.1.2`: http://tools.ietf.org/html/draft-ietf-oauth-revocation-11#section-4.1.2 + .. _`RFC6749`: http://tools.ietf.org/html/rfc6749 + """ + if not request.token: + raise InvalidRequestError(request=request, + description='Missing token parameter.') + + if not self.request_validator.authenticate_client(request): + raise InvalidClientError(request=request) + + if (request.token_type_hint and + request.token_type_hint in self.valid_token_types and + request.token_type_hint not in self.supported_token_types): + raise UnsupportedTokenTypeError(request=request) diff --git a/oauthlib/oauth2/rfc6749/endpoints/token.py b/oauthlib/oauth2/rfc6749/endpoints/token.py new file mode 100644 index 0000000..cda56ad --- /dev/null +++ b/oauthlib/oauth2/rfc6749/endpoints/token.py @@ -0,0 +1,100 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749 +~~~~~~~~~~~~~~~~~~~~~~~ + +This module is an implementation of various logic needed +for consuming and providing OAuth 2.0 RFC6749. +""" +from __future__ import absolute_import, unicode_literals + +import logging + +from oauthlib.common import Request + +from .base import BaseEndpoint, catch_errors_and_unavailability + + +log = logging.getLogger(__name__) + + +class TokenEndpoint(BaseEndpoint): + + """Token issuing endpoint. + + The token endpoint is used by the client to obtain an access token by + presenting its authorization grant or refresh token. The token + endpoint is used with every authorization grant except for the + implicit grant type (since an access token is issued directly). + + The means through which the client obtains the location of the token + endpoint are beyond the scope of this specification, but the location + is typically provided in the service documentation. + + The endpoint URI MAY include an "application/x-www-form-urlencoded" + formatted (per `Appendix B`_) query component, + which MUST be retained when adding additional query parameters. The + endpoint URI MUST NOT include a fragment component:: + + https://example.com/path?query=component # OK + https://example.com/path?query=component#fragment # Not OK + + Since requests to the authorization endpoint result in user + Since requests to the token endpoint result in the transmission of + clear-text credentials (in the HTTP request and response), the + authorization server MUST require the use of TLS as described in + Section 1.6 when sending requests to the token endpoint:: + + # We will deny any request which URI schema is not with https + + The client MUST use the HTTP "POST" method when making access token + requests:: + + # HTTP method is currently not enforced + + Parameters sent without a value MUST be treated as if they were + omitted from the request. The authorization server MUST ignore + unrecognized request parameters. Request and response parameters + MUST NOT be included more than once:: + + # Delegated to each grant type. + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + """ + + def __init__(self, default_grant_type, default_token_type, grant_types): + BaseEndpoint.__init__(self) + self._grant_types = grant_types + self._default_token_type = default_token_type + self._default_grant_type = default_grant_type + + @property + def grant_types(self): + return self._grant_types + + @property + def default_grant_type(self): + return self._default_grant_type + + @property + def default_grant_type_handler(self): + return self.grant_types.get(self.default_grant_type) + + @property + def default_token_type(self): + return self._default_token_type + + @catch_errors_and_unavailability + def create_token_response(self, uri, http_method='GET', body=None, + headers=None, credentials=None): + """Extract grant_type and route to the designated handler.""" + request = Request( + uri, http_method=http_method, body=body, headers=headers) + request.scopes = None + request.extra_credentials = credentials + grant_type_handler = self.grant_types.get(request.grant_type, + self.default_grant_type_handler) + log.debug('Dispatching grant_type %s request to %r.', + request.grant_type, grant_type_handler) + return grant_type_handler.create_token_response( + request, self.default_token_type) diff --git a/oauthlib/oauth2/rfc6749/errors.py b/oauthlib/oauth2/rfc6749/errors.py new file mode 100644 index 0000000..a21d0bd --- /dev/null +++ b/oauthlib/oauth2/rfc6749/errors.py @@ -0,0 +1,259 @@ +# coding=utf-8 +""" +oauthlib.oauth2.rfc6749.errors +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Error used both by OAuth 2 clients and provicers to represent the spec +defined error responses for all four core grant types. +""" +from __future__ import unicode_literals +import json +from oauthlib.common import urlencode, add_params_to_uri + + +class OAuth2Error(Exception): + error = None + status_code = 400 + description = '' + + def __init__(self, description=None, uri=None, state=None, status_code=None, + request=None): + """ + description: A human-readable ASCII [USASCII] text providing + additional information, used to assist the client + developer in understanding the error that occurred. + Values for the "error_description" parameter MUST NOT + include characters outside the set + x20-21 / x23-5B / x5D-7E. + + uri: A URI identifying a human-readable web page with information + about the error, used to provide the client developer with + additional information about the error. Values for the + "error_uri" parameter MUST conform to the URI- Reference + syntax, and thus MUST NOT include characters outside the set + x21 / x23-5B / x5D-7E. + + state: A CSRF protection value received from the client. + + request: Oauthlib Request object + """ + self.description = description or self.description + message = '(%s) %s' % (self.error, self.description) + if request: + message += ' ' + repr(request) + super(OAuth2Error, self).__init__(message) + + self.uri = uri + self.state = state + + if status_code: + self.status_code = status_code + + if request: + self.redirect_uri = request.redirect_uri + self.client_id = request.client_id + self.scopes = request.scopes + self.response_type = request.response_type + self.grant_type = request.grant_type + if not state: + self.state = request.state + + def in_uri(self, uri): + return add_params_to_uri(uri, self.twotuples) + + @property + def twotuples(self): + error = [('error', self.error)] + if self.description: + error.append(('error_description', self.description)) + if self.uri: + error.append(('error_uri', self.uri)) + if self.state: + error.append(('state', self.state)) + return error + + @property + def urlencoded(self): + return urlencode(self.twotuples) + + @property + def json(self): + return json.dumps(dict(self.twotuples)) + + +class TokenExpiredError(OAuth2Error): + error = 'token_expired' + + +class InsecureTransportError(OAuth2Error): + error = 'insecure_transport' + description = 'OAuth 2 MUST utilize https.' + + +class MismatchingStateError(OAuth2Error): + error = 'mismatching_state' + description = 'CSRF Warning! State not equal in request and response.' + + +class MissingCodeError(OAuth2Error): + error = 'missing_code' + + +class MissingTokenError(OAuth2Error): + error = 'missing_token' + + +class MissingTokenTypeError(OAuth2Error): + error = 'missing_token_type' + + +class FatalClientError(OAuth2Error): + + """Errors during authorization where user should not be redirected back. + + If the request fails due to a missing, invalid, or mismatching + redirection URI, or if the client identifier is missing or invalid, + the authorization server SHOULD inform the resource owner of the + error and MUST NOT automatically redirect the user-agent to the + invalid redirection URI. + + Instead the user should be informed of the error by the provider itself. + """ + pass + + +class InvalidRedirectURIError(FatalClientError): + error = 'invalid_redirect_uri' + + +class MissingRedirectURIError(FatalClientError): + error = 'missing_redirect_uri' + + +class MismatchingRedirectURIError(FatalClientError): + error = 'mismatching_redirect_uri' + + +class MissingClientIdError(FatalClientError): + error = 'invalid_client_id' + + +class InvalidClientIdError(FatalClientError): + error = 'invalid_client_id' + + +class InvalidRequestError(OAuth2Error): + + """The request is missing a required parameter, includes an invalid + parameter value, includes a parameter more than once, or is + otherwise malformed. + """ + error = 'invalid_request' + + +class AccessDeniedError(OAuth2Error): + + """The resource owner or authorization server denied the request.""" + error = 'access_denied' + status_code = 401 + + +class UnsupportedResponseTypeError(OAuth2Error): + + """The authorization server does not support obtaining an authorization + code using this method. + """ + error = 'unsupported_response_type' + + +class InvalidScopeError(OAuth2Error): + + """The requested scope is invalid, unknown, or malformed.""" + error = 'invalid_scope' + status_code = 401 + + +class ServerError(OAuth2Error): + + """The authorization server encountered an unexpected condition that + prevented it from fulfilling the request. (This error code is needed + because a 500 Internal Server Error HTTP status code cannot be returned + to the client via a HTTP redirect.) + """ + error = 'server_error' + + +class TemporarilyUnavailableError(OAuth2Error): + + """The authorization server is currently unable to handle the request + due to a temporary overloading or maintenance of the server. + (This error code is needed because a 503 Service Unavailable HTTP + status code cannot be returned to the client via a HTTP redirect.) + """ + error = 'temporarily_unavailable' + + +class InvalidClientError(OAuth2Error): + + """Client authentication failed (e.g. unknown client, no client + authentication included, or unsupported authentication method). + The authorization server MAY return an HTTP 401 (Unauthorized) status + code to indicate which HTTP authentication schemes are supported. + If the client attempted to authenticate via the "Authorization" request + header field, the authorization server MUST respond with an + HTTP 401 (Unauthorized) status code, and include the "WWW-Authenticate" + response header field matching the authentication scheme used by the + client. + """ + error = 'invalid_client' + status_code = 401 + + +class InvalidGrantError(OAuth2Error): + + """The provided authorization grant (e.g. authorization code, resource + owner credentials) or refresh token is invalid, expired, revoked, does + not match the redirection URI used in the authorization request, or was + issued to another client. + """ + error = 'invalid_grant' + status_code = 401 + + +class UnauthorizedClientError(OAuth2Error): + + """The authenticated client is not authorized to use this authorization + grant type. + """ + error = 'unauthorized_client' + status_code = 401 + + +class UnsupportedGrantTypeError(OAuth2Error): + + """The authorization grant type is not supported by the authorization + server. + """ + error = 'unsupported_grant_type' + + +class UnsupportedTokenTypeError(OAuth2Error): + + """The authorization server does not support the revocation of the + presented token type. I.e. the client tried to revoke an access token + on a server not supporting this feature. + """ + error = 'unsupported_token_type' + + +def raise_from_error(error, params=None): + import inspect + import sys + kwargs = { + 'description': params.get('error_description'), + 'uri': params.get('error_uri'), + 'state': params.get('state') + } + for _, cls in inspect.getmembers(sys.modules[__name__], inspect.isclass): + if cls.error == error: + raise cls(**kwargs) diff --git a/oauthlib/oauth2/rfc6749/grant_types/__init__.py b/oauthlib/oauth2/rfc6749/grant_types/__init__.py new file mode 100644 index 0000000..2ec8e4f --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/__init__.py @@ -0,0 +1,12 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +from .authorization_code import AuthorizationCodeGrant +from .implicit import ImplicitGrant +from .resource_owner_password_credentials import ResourceOwnerPasswordCredentialsGrant +from .client_credentials import ClientCredentialsGrant +from .refresh_token import RefreshTokenGrant diff --git a/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py b/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py new file mode 100644 index 0000000..b6ff07c --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py @@ -0,0 +1,393 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import json +import logging + +from oauthlib import common +from oauthlib.uri_validate import is_absolute_uri + +from .base import GrantTypeBase +from .. import errors +from ..request_validator import RequestValidator + +log = logging.getLogger(__name__) + + +class AuthorizationCodeGrant(GrantTypeBase): + + """`Authorization Code Grant`_ + + The authorization code grant type is used to obtain both access + tokens and refresh tokens and is optimized for confidential clients. + Since this is a redirection-based flow, the client must be capable of + interacting with the resource owner's user-agent (typically a web + browser) and capable of receiving incoming requests (via redirection) + from the authorization server:: + + +----------+ + | Resource | + | Owner | + | | + +----------+ + ^ + | + (B) + +----|-----+ Client Identifier +---------------+ + | -+----(A)-- & Redirection URI ---->| | + | User- | | Authorization | + | Agent -+----(B)-- User authenticates --->| Server | + | | | | + | -+----(C)-- Authorization Code ---<| | + +-|----|---+ +---------------+ + | | ^ v + (A) (C) | | + | | | | + ^ v | | + +---------+ | | + | |>---(D)-- Authorization Code ---------' | + | Client | & Redirection URI | + | | | + | |<---(E)----- Access Token -------------------' + +---------+ (w/ Optional Refresh Token) + + Note: The lines illustrating steps (A), (B), and (C) are broken into + two parts as they pass through the user-agent. + + Figure 3: Authorization Code Flow + + The flow illustrated in Figure 3 includes the following steps: + + (A) The client initiates the flow by directing the resource owner's + user-agent to the authorization endpoint. The client includes + its client identifier, requested scope, local state, and a + redirection URI to which the authorization server will send the + user-agent back once access is granted (or denied). + + (B) The authorization server authenticates the resource owner (via + the user-agent) and establishes whether the resource owner + grants or denies the client's access request. + + (C) Assuming the resource owner grants access, the authorization + server redirects the user-agent back to the client using the + redirection URI provided earlier (in the request or during + client registration). The redirection URI includes an + authorization code and any local state provided by the client + earlier. + + (D) The client requests an access token from the authorization + server's token endpoint by including the authorization code + received in the previous step. When making the request, the + client authenticates with the authorization server. The client + includes the redirection URI used to obtain the authorization + code for verification. + + (E) The authorization server authenticates the client, validates the + authorization code, and ensures that the redirection URI + received matches the URI used to redirect the client in + step (C). If valid, the authorization server responds back with + an access token and, optionally, a refresh token. + + .. _`Authorization Code Grant`: http://tools.ietf.org/html/rfc6749#section-4.1 + """ + + def __init__(self, request_validator=None): + self.request_validator = request_validator or RequestValidator() + + def create_authorization_code(self, request): + """Generates an authorization grant represented as a dictionary.""" + grant = {'code': common.generate_token()} + if hasattr(request, 'state') and request.state: + grant['state'] = request.state + log.debug('Created authorization code grant %r for request %r.', + grant, request) + return grant + + def create_authorization_response(self, request, token_handler): + """ + The client constructs the request URI by adding the following + parameters to the query component of the authorization endpoint URI + using the "application/x-www-form-urlencoded" format, per `Appendix B`_: + + response_type + REQUIRED. Value MUST be set to "code". + client_id + REQUIRED. The client identifier as described in `Section 2.2`_. + redirect_uri + OPTIONAL. As described in `Section 3.1.2`_. + scope + OPTIONAL. The scope of the access request as described by + `Section 3.3`_. + state + RECOMMENDED. An opaque value used by the client to maintain + state between the request and callback. The authorization + server includes this value when redirecting the user-agent back + to the client. The parameter SHOULD be used for preventing + cross-site request forgery as described in `Section 10.12`_. + + The client directs the resource owner to the constructed URI using an + HTTP redirection response, or by other means available to it via the + user-agent. + + :param request: oauthlib.commong.Request + :param token_handler: A token handler instace, for example of type + oauthlib.oauth2.BearerToken. + :returns: headers, body, status + :raises: FatalClientError on invalid redirect URI or client id. + ValueError if scopes are not set on the request object. + + A few examples:: + + >>> from your_validator import your_validator + >>> request = Request('https://example.com/authorize?client_id=valid' + ... '&redirect_uri=http%3A%2F%2Fclient.com%2F') + >>> from oauthlib.common import Request + >>> from oauthlib.oauth2 import AuthorizationCodeGrant, BearerToken + >>> token = BearerToken(your_validator) + >>> grant = AuthorizationCodeGrant(your_validator) + >>> grant.create_authorization_response(request, token) + Traceback (most recent call last): + File "", line 1, in + File "oauthlib/oauth2/rfc6749/grant_types.py", line 513, in create_authorization_response + raise ValueError('Scopes must be set on post auth.') + ValueError: Scopes must be set on post auth. + >>> request.scopes = ['authorized', 'in', 'some', 'form'] + >>> grant.create_authorization_response(request, token) + (u'http://client.com/?error=invalid_request&error_description=Missing+response_type+parameter.', None, None, 400) + >>> request = Request('https://example.com/authorize?client_id=valid' + ... '&redirect_uri=http%3A%2F%2Fclient.com%2F' + ... '&response_type=code') + >>> request.scopes = ['authorized', 'in', 'some', 'form'] + >>> grant.create_authorization_response(request, token) + (u'http://client.com/?code=u3F05aEObJuP2k7DordviIgW5wl52N', None, None, 200) + >>> # If the client id or redirect uri fails validation + >>> grant.create_authorization_response(request, token) + Traceback (most recent call last): + File "", line 1, in + File "oauthlib/oauth2/rfc6749/grant_types.py", line 515, in create_authorization_response + >>> grant.create_authorization_response(request, token) + File "oauthlib/oauth2/rfc6749/grant_types.py", line 591, in validate_authorization_request + oauthlib.oauth2.rfc6749.errors.InvalidClientIdError + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + .. _`Section 2.2`: http://tools.ietf.org/html/rfc6749#section-2.2 + .. _`Section 3.1.2`: http://tools.ietf.org/html/rfc6749#section-3.1.2 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 10.12`: http://tools.ietf.org/html/rfc6749#section-10.12 + """ + try: + # request.scopes is only mandated in post auth and both pre and + # post auth use validate_authorization_request + if not request.scopes: + raise ValueError('Scopes must be set on post auth.') + + self.validate_authorization_request(request) + log.debug('Pre resource owner authorization validation ok for %r.', + request) + + # If the request fails due to a missing, invalid, or mismatching + # redirection URI, or if the client identifier is missing or invalid, + # the authorization server SHOULD inform the resource owner of the + # error and MUST NOT automatically redirect the user-agent to the + # invalid redirection URI. + except errors.FatalClientError as e: + log.debug('Fatal client error during validation of %r. %r.', + request, e) + raise + + # If the resource owner denies the access request or if the request + # fails for reasons other than a missing or invalid redirection URI, + # the authorization server informs the client by adding the following + # parameters to the query component of the redirection URI using the + # "application/x-www-form-urlencoded" format, per Appendix B: + # http://tools.ietf.org/html/rfc6749#appendix-B + except errors.OAuth2Error as e: + log.debug('Client error during validation of %r. %r.', request, e) + request.redirect_uri = request.redirect_uri or self.error_uri + return {'Location': common.add_params_to_uri(request.redirect_uri, e.twotuples)}, None, 302 + + grant = self.create_authorization_code(request) + log.debug('Saving grant %r for %r.', grant, request) + self.request_validator.save_authorization_code( + request.client_id, grant, request) + return {'Location': common.add_params_to_uri(request.redirect_uri, grant.items())}, None, 302 + + def create_token_response(self, request, token_handler): + """Validate the authorization code. + + The client MUST NOT use the authorization code more than once. If an + authorization code is used more than once, the authorization server + MUST deny the request and SHOULD revoke (when possible) all tokens + previously issued based on that authorization code. The authorization + code is bound to the client identifier and redirection URI. + """ + headers = { + 'Content-Type': 'application/json', + 'Cache-Control': 'no-store', + 'Pragma': 'no-cache', + } + try: + self.validate_token_request(request) + log.debug('Token request validation ok for %r.', request) + except errors.OAuth2Error as e: + log.debug('Client error during validation of %r. %r.', request, e) + return headers, e.json, e.status_code + + token = token_handler.create_token(request, refresh_token=True) + self.request_validator.invalidate_authorization_code( + request.client_id, request.code, request) + return headers, json.dumps(token), 200 + + def validate_authorization_request(self, request): + """Check the authorization request for normal and fatal errors. + + A normal error could be a missing response_type parameter or the client + attempting to access scope it is not allowed to ask authorization for. + Normal errors can safely be included in the redirection URI and + sent back to the client. + + Fatal errors occur when the client_id or redirect_uri is invalid or + missing. These must be caught by the provider and handled, how this + is done is outside of the scope of OAuthLib but showing an error + page describing the issue is a good idea. + """ + + # First check for fatal errors + + # If the request fails due to a missing, invalid, or mismatching + # redirection URI, or if the client identifier is missing or invalid, + # the authorization server SHOULD inform the resource owner of the + # error and MUST NOT automatically redirect the user-agent to the + # invalid redirection URI. + + # REQUIRED. The client identifier as described in Section 2.2. + # http://tools.ietf.org/html/rfc6749#section-2.2 + if not request.client_id: + raise errors.MissingClientIdError(request=request) + + if not self.request_validator.validate_client_id(request.client_id, request): + raise errors.InvalidClientIdError(request=request) + + # OPTIONAL. As described in Section 3.1.2. + # http://tools.ietf.org/html/rfc6749#section-3.1.2 + log.debug('Validating redirection uri %s for client %s.', + request.redirect_uri, request.client_id) + if request.redirect_uri is not None: + request.using_default_redirect_uri = False + log.debug('Using provided redirect_uri %s', request.redirect_uri) + if not is_absolute_uri(request.redirect_uri): + raise errors.InvalidRedirectURIError(request=request) + + if not self.request_validator.validate_redirect_uri( + request.client_id, request.redirect_uri, request): + raise errors.MismatchingRedirectURIError(request=request) + else: + request.redirect_uri = self.request_validator.get_default_redirect_uri( + request.client_id, request) + request.using_default_redirect_uri = True + log.debug('Using default redirect_uri %s.', request.redirect_uri) + if not request.redirect_uri: + raise errors.MissingRedirectURIError(request=request) + + # Then check for normal errors. + + # If the resource owner denies the access request or if the request + # fails for reasons other than a missing or invalid redirection URI, + # the authorization server informs the client by adding the following + # parameters to the query component of the redirection URI using the + # "application/x-www-form-urlencoded" format, per Appendix B. + # http://tools.ietf.org/html/rfc6749#appendix-B + + # Note that the correct parameters to be added are automatically + # populated through the use of specific exceptions. + if request.response_type is None: + raise errors.InvalidRequestError(description='Missing response_type parameter.', request=request) + + for param in ('client_id', 'response_type', 'redirect_uri', 'scope', 'state'): + if param in request.duplicate_params: + raise errors.InvalidRequestError(description='Duplicate %s parameter.' % param, request=request) + + if not self.request_validator.validate_response_type(request.client_id, + request.response_type, request.client, request): + log.debug('Client %s is not authorized to use response_type %s.', + request.client_id, request.response_type) + raise errors.UnauthorizedClientError(request=request) + + # REQUIRED. Value MUST be set to "code". + if request.response_type != 'code': + raise errors.UnsupportedResponseTypeError(request=request) + + # OPTIONAL. The scope of the access request as described by Section 3.3 + # http://tools.ietf.org/html/rfc6749#section-3.3 + self.validate_scopes(request) + + return request.scopes, { + 'client_id': request.client_id, + 'redirect_uri': request.redirect_uri, + 'response_type': request.response_type, + 'state': request.state, + 'request': request, + } + + def validate_token_request(self, request): + # REQUIRED. Value MUST be set to "authorization_code". + if request.grant_type != 'authorization_code': + raise errors.UnsupportedGrantTypeError(request=request) + + if request.code is None: + raise errors.InvalidRequestError( + description='Missing code parameter.', request=request) + + for param in ('client_id', 'grant_type', 'redirect_uri'): + if param in request.duplicate_params: + raise errors.InvalidRequestError(description='Duplicate %s parameter.' % param, + request=request) + + if self.request_validator.client_authentication_required(request): + # If the client type is confidential or the client was issued client + # credentials (or assigned other authentication requirements), the + # client MUST authenticate with the authorization server as described + # in Section 3.2.1. + # http://tools.ietf.org/html/rfc6749#section-3.2.1 + if not self.request_validator.authenticate_client(request): + log.debug('Client authentication failed, %r.', request) + raise errors.InvalidClientError(request=request) + elif not self.request_validator.authenticate_client_id(request.client_id, request): + # REQUIRED, if the client is not authenticating with the + # authorization server as described in Section 3.2.1. + # http://tools.ietf.org/html/rfc6749#section-3.2.1 + log.debug('Client authentication failed, %r.', request) + raise errors.InvalidClientError(request=request) + + if not hasattr(request.client, 'client_id'): + raise NotImplementedError('Authenticate client must set the ' + 'request.client.client_id attribute ' + 'in authenticate_client.') + + # Ensure client is authorized use of this grant type + self.validate_grant_type(request) + + # REQUIRED. The authorization code received from the + # authorization server. + if not self.request_validator.validate_code(request.client_id, + request.code, request.client, request): + log.debug('Client, %r (%r), is not allowed access to scopes %r.', + request.client_id, request.client, request.scopes) + raise errors.InvalidGrantError(request=request) + + for attr in ('user', 'state', 'scopes'): + if getattr(request, attr) is None: + log.debug('request.%s was not set on code validation.', attr) + + # REQUIRED, if the "redirect_uri" parameter was included in the + # authorization request as described in Section 4.1.1, and their + # values MUST be identical. + if not self.request_validator.confirm_redirect_uri(request.client_id, request.code, + request.redirect_uri, request.client): + log.debug('Redirect_uri (%r) invalid for client %r (%r).', + request.redirect_uri, request.client_id, request.client) + raise errors.AccessDeniedError(request=request) diff --git a/oauthlib/oauth2/rfc6749/grant_types/base.py b/oauthlib/oauth2/rfc6749/grant_types/base.py new file mode 100644 index 0000000..4a8017f --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/base.py @@ -0,0 +1,40 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import logging + +from oauthlib.oauth2.rfc6749 import errors, utils + +log = logging.getLogger(__name__) + + +class GrantTypeBase(object): + error_uri = None + request_validator = None + + def create_authorization_response(self, request, token_handler): + raise NotImplementedError('Subclasses must implement this method.') + + def create_token_response(self, request, token_handler): + raise NotImplementedError('Subclasses must implement this method.') + + def validate_grant_type(self, request): + if not self.request_validator.validate_grant_type(request.client_id, + request.grant_type, request.client, request): + log.debug('Unauthorized from %r (%r) access to grant type %s.', + request.client_id, request.client, request.grant_type) + raise errors.UnauthorizedClientError(request=request) + + def validate_scopes(self, request): + if not request.scopes: + request.scopes = utils.scope_to_list(request.scope) or utils.scope_to_list( + self.request_validator.get_default_scopes(request.client_id, request)) + log.debug('Validating access to scopes %r for client %r (%r).', + request.scopes, request.client_id, request.client) + if not self.request_validator.validate_scopes(request.client_id, + request.scopes, request.client, request): + raise errors.InvalidScopeError(request=request) diff --git a/oauthlib/oauth2/rfc6749/grant_types/client_credentials.py b/oauthlib/oauth2/rfc6749/grant_types/client_credentials.py new file mode 100644 index 0000000..30df247 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/client_credentials.py @@ -0,0 +1,112 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import json +import logging + +from .base import GrantTypeBase +from .. import errors +from ..request_validator import RequestValidator + +log = logging.getLogger(__name__) + + +class ClientCredentialsGrant(GrantTypeBase): + + """`Client Credentials Grant`_ + + The client can request an access token using only its client + credentials (or other supported means of authentication) when the + client is requesting access to the protected resources under its + control, or those of another resource owner that have been previously + arranged with the authorization server (the method of which is beyond + the scope of this specification). + + The client credentials grant type MUST only be used by confidential + clients:: + + +---------+ +---------------+ + : : : : + : :>-- A - Client Authentication --->: Authorization : + : Client : : Server : + : :<-- B ---- Access Token ---------<: : + : : : : + +---------+ +---------------+ + + Figure 6: Client Credentials Flow + + The flow illustrated in Figure 6 includes the following steps: + + (A) The client authenticates with the authorization server and + requests an access token from the token endpoint. + + (B) The authorization server authenticates the client, and if valid, + issues an access token. + + .. _`Client Credentials Grant`: http://tools.ietf.org/html/rfc6749#section-4.4 + """ + + def __init__(self, request_validator=None): + self.request_validator = request_validator or RequestValidator() + + def create_token_response(self, request, token_handler): + """Return token or error in JSON format. + + If the access token request is valid and authorized, the + authorization server issues an access token as described in + `Section 5.1`_. A refresh token SHOULD NOT be included. If the request + failed client authentication or is invalid, the authorization server + returns an error response as described in `Section 5.2`_. + + .. _`Section 5.1`: http://tools.ietf.org/html/rfc6749#section-5.1 + .. _`Section 5.2`: http://tools.ietf.org/html/rfc6749#section-5.2 + """ + headers = { + 'Content-Type': 'application/json', + 'Cache-Control': 'no-store', + 'Pragma': 'no-cache', + } + try: + log.debug('Validating access token request, %r.', request) + self.validate_token_request(request) + except errors.OAuth2Error as e: + log.debug('Client error in token request. %s.', e) + return headers, e.json, e.status_code + + token = token_handler.create_token(request, refresh_token=False) + log.debug('Issuing token to client id %r (%r), %r.', + request.client_id, request.client, token) + return headers, json.dumps(token), 200 + + def validate_token_request(self, request): + if not getattr(request, 'grant_type'): + raise errors.InvalidRequestError('Request is missing grant type.', + request=request) + + if not request.grant_type == 'client_credentials': + raise errors.UnsupportedGrantTypeError(request=request) + + for param in ('grant_type', 'scope'): + if param in request.duplicate_params: + raise errors.InvalidRequestError(description='Duplicate %s parameter.' % param, + request=request) + + log.debug('Authenticating client, %r.', request) + if not self.request_validator.authenticate_client(request): + log.debug('Client authentication failed, %r.', request) + raise errors.InvalidClientError(request=request) + else: + if not hasattr(request.client, 'client_id'): + raise NotImplementedError('Authenticate client must set the ' + 'request.client.client_id attribute ' + 'in authenticate_client.') + # Ensure client is authorized use of this grant type + self.validate_grant_type(request) + + log.debug('Authorizing access to user %r.', request.user) + request.client_id = request.client_id or request.client.client_id + self.validate_scopes(request) diff --git a/oauthlib/oauth2/rfc6749/grant_types/implicit.py b/oauthlib/oauth2/rfc6749/grant_types/implicit.py new file mode 100644 index 0000000..27bcb24 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/implicit.py @@ -0,0 +1,338 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import logging + +from oauthlib import common +from oauthlib.uri_validate import is_absolute_uri + +from .base import GrantTypeBase +from .. import errors +from ..request_validator import RequestValidator + +log = logging.getLogger(__name__) + + +class ImplicitGrant(GrantTypeBase): + + """`Implicit Grant`_ + + The implicit grant type is used to obtain access tokens (it does not + support the issuance of refresh tokens) and is optimized for public + clients known to operate a particular redirection URI. These clients + are typically implemented in a browser using a scripting language + such as JavaScript. + + Unlike the authorization code grant type, in which the client makes + separate requests for authorization and for an access token, the + client receives the access token as the result of the authorization + request. + + The implicit grant type does not include client authentication, and + relies on the presence of the resource owner and the registration of + the redirection URI. Because the access token is encoded into the + redirection URI, it may be exposed to the resource owner and other + applications residing on the same device:: + + +----------+ + | Resource | + | Owner | + | | + +----------+ + ^ + | + (B) + +----|-----+ Client Identifier +---------------+ + | -+----(A)-- & Redirection URI --->| | + | User- | | Authorization | + | Agent -|----(B)-- User authenticates -->| Server | + | | | | + | |<---(C)--- Redirection URI ----<| | + | | with Access Token +---------------+ + | | in Fragment + | | +---------------+ + | |----(D)--- Redirection URI ---->| Web-Hosted | + | | without Fragment | Client | + | | | Resource | + | (F) |<---(E)------- Script ---------<| | + | | +---------------+ + +-|--------+ + | | + (A) (G) Access Token + | | + ^ v + +---------+ + | | + | Client | + | | + +---------+ + + Note: The lines illustrating steps (A) and (B) are broken into two + parts as they pass through the user-agent. + + Figure 4: Implicit Grant Flow + + The flow illustrated in Figure 4 includes the following steps: + + (A) The client initiates the flow by directing the resource owner's + user-agent to the authorization endpoint. The client includes + its client identifier, requested scope, local state, and a + redirection URI to which the authorization server will send the + user-agent back once access is granted (or denied). + + (B) The authorization server authenticates the resource owner (via + the user-agent) and establishes whether the resource owner + grants or denies the client's access request. + + (C) Assuming the resource owner grants access, the authorization + server redirects the user-agent back to the client using the + redirection URI provided earlier. The redirection URI includes + the access token in the URI fragment. + + (D) The user-agent follows the redirection instructions by making a + request to the web-hosted client resource (which does not + include the fragment per [RFC2616]). The user-agent retains the + fragment information locally. + + (E) The web-hosted client resource returns a web page (typically an + HTML document with an embedded script) capable of accessing the + full redirection URI including the fragment retained by the + user-agent, and extracting the access token (and other + parameters) contained in the fragment. + + (F) The user-agent executes the script provided by the web-hosted + client resource locally, which extracts the access token. + + (G) The user-agent passes the access token to the client. + + See `Section 10.3`_ and `Section 10.16`_ for important security considerations + when using the implicit grant. + + .. _`Implicit Grant`: http://tools.ietf.org/html/rfc6749#section-4.2 + .. _`Section 10.3`: http://tools.ietf.org/html/rfc6749#section-10.3 + .. _`Section 10.16`: http://tools.ietf.org/html/rfc6749#section-10.16 + """ + + def __init__(self, request_validator=None): + self.request_validator = request_validator or RequestValidator() + + def create_authorization_response(self, request, token_handler): + """Create an authorization response. + The client constructs the request URI by adding the following + parameters to the query component of the authorization endpoint URI + using the "application/x-www-form-urlencoded" format, per `Appendix B`_: + + response_type + REQUIRED. Value MUST be set to "token". + + client_id + REQUIRED. The client identifier as described in `Section 2.2`_. + + redirect_uri + OPTIONAL. As described in `Section 3.1.2`_. + + scope + OPTIONAL. The scope of the access request as described by + `Section 3.3`_. + + state + RECOMMENDED. An opaque value used by the client to maintain + state between the request and callback. The authorization + server includes this value when redirecting the user-agent back + to the client. The parameter SHOULD be used for preventing + cross-site request forgery as described in `Section 10.12`_. + + The authorization server validates the request to ensure that all + required parameters are present and valid. The authorization server + MUST verify that the redirection URI to which it will redirect the + access token matches a redirection URI registered by the client as + described in `Section 3.1.2`_. + + .. _`Section 2.2`: http://tools.ietf.org/html/rfc6749#section-2.2 + .. _`Section 3.1.2`: http://tools.ietf.org/html/rfc6749#section-3.1.2 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 10.12`: http://tools.ietf.org/html/rfc6749#section-10.12 + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + """ + return self.create_token_response(request, token_handler) + + def create_token_response(self, request, token_handler): + """Return token or error embedded in the URI fragment. + + If the resource owner grants the access request, the authorization + server issues an access token and delivers it to the client by adding + the following parameters to the fragment component of the redirection + URI using the "application/x-www-form-urlencoded" format, per + `Appendix B`_: + + access_token + REQUIRED. The access token issued by the authorization server. + + token_type + REQUIRED. The type of the token issued as described in + `Section 7.1`_. Value is case insensitive. + + expires_in + RECOMMENDED. The lifetime in seconds of the access token. For + example, the value "3600" denotes that the access token will + expire in one hour from the time the response was generated. + If omitted, the authorization server SHOULD provide the + expiration time via other means or document the default value. + + scope + OPTIONAL, if identical to the scope requested by the client; + otherwise, REQUIRED. The scope of the access token as + described by `Section 3.3`_. + + state + REQUIRED if the "state" parameter was present in the client + authorization request. The exact value received from the + client. + + The authorization server MUST NOT issue a refresh token. + + .. _`Appendix B`: http://tools.ietf.org/html/rfc6749#appendix-B + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 7.1`: http://tools.ietf.org/html/rfc6749#section-7.1 + """ + try: + # request.scopes is only mandated in post auth and both pre and + # post auth use validate_authorization_request + if not request.scopes: + raise ValueError('Scopes must be set on post auth.') + + self.validate_token_request(request) + + # If the request fails due to a missing, invalid, or mismatching + # redirection URI, or if the client identifier is missing or invalid, + # the authorization server SHOULD inform the resource owner of the + # error and MUST NOT automatically redirect the user-agent to the + # invalid redirection URI. + except errors.FatalClientError as e: + log.debug('Fatal client error during validation of %r. %r.', + request, e) + raise + + # If the resource owner denies the access request or if the request + # fails for reasons other than a missing or invalid redirection URI, + # the authorization server informs the client by adding the following + # parameters to the fragment component of the redirection URI using the + # "application/x-www-form-urlencoded" format, per Appendix B: + # http://tools.ietf.org/html/rfc6749#appendix-B + except errors.OAuth2Error as e: + log.debug('Client error during validation of %r. %r.', request, e) + return {'Location': common.add_params_to_uri(request.redirect_uri, e.twotuples, + fragment=True)}, None, 302 + + token = token_handler.create_token(request, refresh_token=False) + return {'Location': common.add_params_to_uri(request.redirect_uri, token.items(), + fragment=True)}, None, 302 + + def validate_authorization_request(self, request): + return self.validate_token_request(request) + + def validate_token_request(self, request): + """Check the token request for normal and fatal errors. + + This method is very similar to validate_authorization_request in + the AuthorizationCodeGrant but differ in a few subtle areas. + + A normal error could be a missing response_type parameter or the client + attempting to access scope it is not allowed to ask authorization for. + Normal errors can safely be included in the redirection URI and + sent back to the client. + + Fatal errors occur when the client_id or redirect_uri is invalid or + missing. These must be caught by the provider and handled, how this + is done is outside of the scope of OAuthLib but showing an error + page describing the issue is a good idea. + """ + + # First check for fatal errors + + # If the request fails due to a missing, invalid, or mismatching + # redirection URI, or if the client identifier is missing or invalid, + # the authorization server SHOULD inform the resource owner of the + # error and MUST NOT automatically redirect the user-agent to the + # invalid redirection URI. + + # REQUIRED. The client identifier as described in Section 2.2. + # http://tools.ietf.org/html/rfc6749#section-2.2 + if not request.client_id: + raise errors.MissingClientIdError(request=request) + + if not self.request_validator.validate_client_id(request.client_id, request): + raise errors.InvalidClientIdError(request=request) + + # OPTIONAL. As described in Section 3.1.2. + # http://tools.ietf.org/html/rfc6749#section-3.1.2 + if request.redirect_uri is not None: + request.using_default_redirect_uri = False + log.debug('Using provided redirect_uri %s', request.redirect_uri) + if not is_absolute_uri(request.redirect_uri): + raise errors.InvalidRedirectURIError(request=request) + + # The authorization server MUST verify that the redirection URI + # to which it will redirect the access token matches a + # redirection URI registered by the client as described in + # Section 3.1.2. + # http://tools.ietf.org/html/rfc6749#section-3.1.2 + if not self.request_validator.validate_redirect_uri( + request.client_id, request.redirect_uri, request): + raise errors.MismatchingRedirectURIError(request=request) + else: + request.redirect_uri = self.request_validator.get_default_redirect_uri( + request.client_id, request) + request.using_default_redirect_uri = True + log.debug('Using default redirect_uri %s.', request.redirect_uri) + if not request.redirect_uri: + raise errors.MissingRedirectURIError(request=request) + if not is_absolute_uri(request.redirect_uri): + raise errors.InvalidRedirectURIError(request=request) + + # Then check for normal errors. + + # If the resource owner denies the access request or if the request + # fails for reasons other than a missing or invalid redirection URI, + # the authorization server informs the client by adding the following + # parameters to the fragment component of the redirection URI using the + # "application/x-www-form-urlencoded" format, per Appendix B. + # http://tools.ietf.org/html/rfc6749#appendix-B + + # Note that the correct parameters to be added are automatically + # populated through the use of specific exceptions. + if request.response_type is None: + raise errors.InvalidRequestError(description='Missing response_type parameter.', + request=request) + + for param in ('client_id', 'response_type', 'redirect_uri', 'scope', 'state'): + if param in request.duplicate_params: + raise errors.InvalidRequestError(description='Duplicate %s parameter.' % param, request=request) + + # REQUIRED. Value MUST be set to "token". + if request.response_type != 'token': + raise errors.UnsupportedResponseTypeError(request=request) + + log.debug('Validating use of response_type token for client %r (%r).', + request.client_id, request.client) + if not self.request_validator.validate_response_type(request.client_id, + request.response_type, request.client, request): + log.debug('Client %s is not authorized to use response_type %s.', + request.client_id, request.response_type) + raise errors.UnauthorizedClientError(request=request) + + # OPTIONAL. The scope of the access request as described by Section 3.3 + # http://tools.ietf.org/html/rfc6749#section-3.3 + self.validate_scopes(request) + + return request.scopes, { + 'client_id': request.client_id, + 'redirect_uri': request.redirect_uri, + 'response_type': request.response_type, + 'state': request.state, + 'request': request, + } diff --git a/oauthlib/oauth2/rfc6749/grant_types/refresh_token.py b/oauthlib/oauth2/rfc6749/grant_types/refresh_token.py new file mode 100644 index 0000000..0ab10c9 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/refresh_token.py @@ -0,0 +1,119 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import json +import logging + +from .base import GrantTypeBase +from .. import errors, utils +from ..request_validator import RequestValidator + +log = logging.getLogger(__name__) + + +class RefreshTokenGrant(GrantTypeBase): + + """`Refresh token grant`_ + + .. _`Refresh token grant`: http://tools.ietf.org/html/rfc6749#section-6 + """ + + @property + def issue_new_refresh_tokens(self): + return True + + def __init__(self, request_validator=None, issue_new_refresh_tokens=True): + self.request_validator = request_validator or RequestValidator() + + def create_token_response(self, request, token_handler): + """Create a new access token from a refresh_token. + + If valid and authorized, the authorization server issues an access + token as described in `Section 5.1`_. If the request failed + verification or is invalid, the authorization server returns an error + response as described in `Section 5.2`_. + + The authorization server MAY issue a new refresh token, in which case + the client MUST discard the old refresh token and replace it with the + new refresh token. The authorization server MAY revoke the old + refresh token after issuing a new refresh token to the client. If a + new refresh token is issued, the refresh token scope MUST be + identical to that of the refresh token included by the client in the + request. + + .. _`Section 5.1`: http://tools.ietf.org/html/rfc6749#section-5.1 + .. _`Section 5.2`: http://tools.ietf.org/html/rfc6749#section-5.2 + """ + headers = { + 'Content-Type': 'application/json', + 'Cache-Control': 'no-store', + 'Pragma': 'no-cache', + } + try: + log.debug('Validating refresh token request, %r.', request) + self.validate_token_request(request) + except errors.OAuth2Error as e: + return headers, e.json, e.status_code + + token = token_handler.create_token(request, + refresh_token=self.issue_new_refresh_tokens) + log.debug('Issuing new token to client id %r (%r), %r.', + request.client_id, request.client, token) + return headers, json.dumps(token), 200 + + def validate_token_request(self, request): + # REQUIRED. Value MUST be set to "refresh_token". + if request.grant_type != 'refresh_token': + raise errors.UnsupportedGrantTypeError(request=request) + + if request.refresh_token is None: + raise errors.InvalidRequestError( + description='Missing refresh token parameter.', + request=request) + + # Because refresh tokens are typically long-lasting credentials used to + # request additional access tokens, the refresh token is bound to the + # client to which it was issued. If the client type is confidential or + # the client was issued client credentials (or assigned other + # authentication requirements), the client MUST authenticate with the + # authorization server as described in Section 3.2.1. + # http://tools.ietf.org/html/rfc6749#section-3.2.1 + if self.request_validator.client_authentication_required(request): + log.debug('Authenticating client, %r.', request) + if not self.request_validator.authenticate_client(request): + log.debug('Invalid client (%r), denying access.', request) + raise errors.InvalidClientError(request=request) + elif not self.request_validator.authenticate_client_id(request.client_id, request): + log.debug('Client authentication failed, %r.', request) + raise errors.InvalidClientError(request=request) + + # Ensure client is authorized use of this grant type + self.validate_grant_type(request) + + # REQUIRED. The refresh token issued to the client. + log.debug('Validating refresh token %s for client %r.', + request.refresh_token, request.client) + if not self.request_validator.validate_refresh_token( + request.refresh_token, request.client, request): + log.debug('Invalid refresh token, %s, for client %r.', + request.refresh_token, request.client) + raise errors.InvalidGrantError(request=request) + + original_scopes = utils.scope_to_list( + self.request_validator.get_original_scopes( + request.refresh_token, request)) + + if request.scope: + request.scopes = utils.scope_to_list(request.scope) + if (not all((s in original_scopes for s in request.scopes)) + and not self.request_validator.is_within_original_scope( + request.scopes, request.refresh_token, request)): + log.debug('Refresh token %s lack requested scopes, %r.', + request.refresh_token, request.scopes) + raise errors.InvalidScopeError(request=request) + else: + request.scopes = original_scopes diff --git a/oauthlib/oauth2/rfc6749/grant_types/resource_owner_password_credentials.py b/oauthlib/oauth2/rfc6749/grant_types/resource_owner_password_credentials.py new file mode 100644 index 0000000..c19e6cf --- /dev/null +++ b/oauthlib/oauth2/rfc6749/grant_types/resource_owner_password_credentials.py @@ -0,0 +1,194 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import json +import logging + +from .base import GrantTypeBase +from .. import errors +from ..request_validator import RequestValidator + +log = logging.getLogger(__name__) + + +class ResourceOwnerPasswordCredentialsGrant(GrantTypeBase): + + """`Resource Owner Password Credentials Grant`_ + + The resource owner password credentials grant type is suitable in + cases where the resource owner has a trust relationship with the + client, such as the device operating system or a highly privileged + application. The authorization server should take special care when + enabling this grant type and only allow it when other flows are not + viable. + + This grant type is suitable for clients capable of obtaining the + resource owner's credentials (username and password, typically using + an interactive form). It is also used to migrate existing clients + using direct authentication schemes such as HTTP Basic or Digest + authentication to OAuth by converting the stored credentials to an + access token:: + + +----------+ + | Resource | + | Owner | + | | + +----------+ + v + | Resource Owner + (A) Password Credentials + | + v + +---------+ +---------------+ + | |>--(B)---- Resource Owner ------->| | + | | Password Credentials | Authorization | + | Client | | Server | + | |<--(C)---- Access Token ---------<| | + | | (w/ Optional Refresh Token) | | + +---------+ +---------------+ + + Figure 5: Resource Owner Password Credentials Flow + + The flow illustrated in Figure 5 includes the following steps: + + (A) The resource owner provides the client with its username and + password. + + (B) The client requests an access token from the authorization + server's token endpoint by including the credentials received + from the resource owner. When making the request, the client + authenticates with the authorization server. + + (C) The authorization server authenticates the client and validates + the resource owner credentials, and if valid, issues an access + token. + + .. _`Resource Owner Password Credentials Grant`: http://tools.ietf.org/html/rfc6749#section-4.3 + """ + + def __init__(self, request_validator=None, refresh_token=True): + """ + If the refresh_token keyword argument is False, do not return + a refresh token in the response. + """ + self.request_validator = request_validator or RequestValidator() + self.refresh_token = refresh_token + + def create_token_response(self, request, token_handler): + """Return token or error in json format. + + If the access token request is valid and authorized, the + authorization server issues an access token and optional refresh + token as described in `Section 5.1`_. If the request failed client + authentication or is invalid, the authorization server returns an + error response as described in `Section 5.2`_. + + .. _`Section 5.1`: http://tools.ietf.org/html/rfc6749#section-5.1 + .. _`Section 5.2`: http://tools.ietf.org/html/rfc6749#section-5.2 + """ + headers = { + 'Content-Type': 'application/json', + 'Cache-Control': 'no-store', + 'Pragma': 'no-cache', + } + try: + if self.request_validator.client_authentication_required(request): + log.debug('Authenticating client, %r.', request) + if not self.request_validator.authenticate_client(request): + log.debug('Client authentication failed, %r.', request) + raise errors.InvalidClientError(request=request) + elif not self.request_validator.authenticate_client_id(request.client_id, request): + log.debug('Client authentication failed, %r.', request) + raise errors.InvalidClientError(request=request) + log.debug('Validating access token request, %r.', request) + self.validate_token_request(request) + except errors.OAuth2Error as e: + log.debug('Client error in token request, %s.', e) + return headers, e.json, e.status_code + + token = token_handler.create_token(request, self.refresh_token) + log.debug('Issuing token %r to client id %r (%r) and username %s.', + token, request.client_id, request.client, request.username) + return headers, json.dumps(token), 200 + + def validate_token_request(self, request): + """ + The client makes a request to the token endpoint by adding the + following parameters using the "application/x-www-form-urlencoded" + format per Appendix B with a character encoding of UTF-8 in the HTTP + request entity-body: + + grant_type + REQUIRED. Value MUST be set to "password". + + username + REQUIRED. The resource owner username. + + password + REQUIRED. The resource owner password. + + scope + OPTIONAL. The scope of the access request as described by + `Section 3.3`_. + + If the client type is confidential or the client was issued client + credentials (or assigned other authentication requirements), the + client MUST authenticate with the authorization server as described + in `Section 3.2.1`_. + + The authorization server MUST: + + o require client authentication for confidential clients or for any + client that was issued client credentials (or with other + authentication requirements), + + o authenticate the client if client authentication is included, and + + o validate the resource owner password credentials using its + existing password validation algorithm. + + Since this access token request utilizes the resource owner's + password, the authorization server MUST protect the endpoint against + brute force attacks (e.g., using rate-limitation or generating + alerts). + + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`Section 3.2.1`: http://tools.ietf.org/html/rfc6749#section-3.2.1 + """ + for param in ('grant_type', 'username', 'password'): + if not getattr(request, param): + raise errors.InvalidRequestError( + 'Request is missing %s parameter.' % param, request=request) + + for param in ('grant_type', 'username', 'password', 'scope'): + if param in request.duplicate_params: + raise errors.InvalidRequestError(description='Duplicate %s parameter.' % param, request=request) + + # This error should rarely (if ever) occur if requests are routed to + # grant type handlers based on the grant_type parameter. + if not request.grant_type == 'password': + raise errors.UnsupportedGrantTypeError(request=request) + + log.debug('Validating username %s.', request.username) + if not self.request_validator.validate_user(request.username, + request.password, request.client, request): + raise errors.InvalidGrantError( + 'Invalid credentials given.', request=request) + else: + if not hasattr(request.client, 'client_id'): + raise NotImplementedError( + 'Validate user must set the ' + 'request.client.client_id attribute ' + 'in authenticate_client.') + log.debug('Authorizing access to user %r.', request.user) + + # Ensure client is authorized use of this grant type + self.validate_grant_type(request) + + if request.client: + request.client_id = request.client_id or request.client.client_id + self.validate_scopes(request) diff --git a/oauthlib/oauth2/rfc6749/parameters.py b/oauthlib/oauth2/rfc6749/parameters.py new file mode 100644 index 0000000..b46889c --- /dev/null +++ b/oauthlib/oauth2/rfc6749/parameters.py @@ -0,0 +1,406 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.parameters +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module contains methods related to `Section 4`_ of the OAuth 2 RFC. + +.. _`Section 4`: http://tools.ietf.org/html/rfc6749#section-4 +""" +from __future__ import absolute_import, unicode_literals + +import json +import os +import time +try: + import urlparse +except ImportError: + import urllib.parse as urlparse +from oauthlib.common import add_params_to_uri, add_params_to_qs, unicode_type +from oauthlib.signals import scope_changed +from .errors import raise_from_error, MissingTokenError, MissingTokenTypeError +from .errors import MismatchingStateError, MissingCodeError +from .errors import InsecureTransportError +from .tokens import OAuth2Token +from .utils import list_to_scope, scope_to_list, is_secure_transport + + +def prepare_grant_uri(uri, client_id, response_type, redirect_uri=None, + scope=None, state=None, **kwargs): + """Prepare the authorization grant request URI. + + The client constructs the request URI by adding the following + parameters to the query component of the authorization endpoint URI + using the ``application/x-www-form-urlencoded`` format as defined by + [`W3C.REC-html401-19991224`_]: + + :param response_type: To indicate which OAuth 2 grant/flow is required, + "code" and "token". + :param client_id: The client identifier as described in `Section 2.2`_. + :param redirect_uri: The client provided URI to redirect back to after + authorization as described in `Section 3.1.2`_. + :param scope: The scope of the access request as described by + `Section 3.3`_. + + :param state: An opaque value used by the client to maintain + state between the request and callback. The authorization + server includes this value when redirecting the user-agent + back to the client. The parameter SHOULD be used for + preventing cross-site request forgery as described in + `Section 10.12`_. + :param kwargs: Extra arguments to embed in the grant/authorization URL. + + An example of an authorization code grant authorization URL: + + .. code-block:: http + + GET /authorize?response_type=code&client_id=s6BhdRkqt3&state=xyz + &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb HTTP/1.1 + Host: server.example.com + + .. _`W3C.REC-html401-19991224`: http://tools.ietf.org/html/rfc6749#ref-W3C.REC-html401-19991224 + .. _`Section 2.2`: http://tools.ietf.org/html/rfc6749#section-2.2 + .. _`Section 3.1.2`: http://tools.ietf.org/html/rfc6749#section-3.1.2 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`section 10.12`: http://tools.ietf.org/html/rfc6749#section-10.12 + """ + if not is_secure_transport(uri): + raise InsecureTransportError() + + params = [(('response_type', response_type)), + (('client_id', client_id))] + + if redirect_uri: + params.append(('redirect_uri', redirect_uri)) + if scope: + params.append(('scope', list_to_scope(scope))) + if state: + params.append(('state', state)) + + for k in kwargs: + if kwargs[k]: + params.append((unicode_type(k), kwargs[k])) + + return add_params_to_uri(uri, params) + + +def prepare_token_request(grant_type, body='', **kwargs): + """Prepare the access token request. + + The client makes a request to the token endpoint by adding the + following parameters using the ``application/x-www-form-urlencoded`` + format in the HTTP request entity-body: + + :param grant_type: To indicate grant type being used, i.e. "password", + "authorization_code" or "client_credentials". + :param body: Existing request body to embed parameters in. + :param code: If using authorization code grant, pass the previously + obtained authorization code as the ``code`` argument. + :param redirect_uri: If the "redirect_uri" parameter was included in the + authorization request as described in + `Section 4.1.1`_, and their values MUST be identical. + :param kwargs: Extra arguments to embed in the request body. + + An example of an authorization code token request body: + + .. code-block:: http + + grant_type=authorization_code&code=SplxlOBeZQQYbYS6WxSbIA + &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb + + .. _`Section 4.1.1`: http://tools.ietf.org/html/rfc6749#section-4.1.1 + """ + params = [('grant_type', grant_type)] + + if 'scope' in kwargs: + kwargs['scope'] = list_to_scope(kwargs['scope']) + + for k in kwargs: + if kwargs[k]: + params.append((unicode_type(k), kwargs[k])) + + return add_params_to_qs(body, params) + + +def prepare_token_revocation_request(url, token, token_type_hint="access_token", + callback=None, body='', **kwargs): + """Prepare a token revocation request. + + The client constructs the request by including the following parameters + using the "application/x-www-form-urlencoded" format in the HTTP request + entity-body: + + token REQUIRED. The token that the client wants to get revoked. + + token_type_hint OPTIONAL. A hint about the type of the token submitted + for revocation. Clients MAY pass this parameter in order to help the + authorization server to optimize the token lookup. If the server is unable + to locate the token using the given hint, it MUST extend its search across + all of its supported token types. An authorization server MAY ignore this + parameter, particularly if it is able to detect the token type + automatically. This specification defines two such values: + + * access_token: An access token as defined in [RFC6749], + `Section 1.4`_ + + * refresh_token: A refresh token as defined in [RFC6749], + `Section 1.5`_ + + Specific implementations, profiles, and extensions of this + specification MAY define other values for this parameter using the + registry defined in `Section 4.1.2`_. + + .. _`Section 1.4`: http://tools.ietf.org/html/rfc6749#section-1.4 + .. _`Section 1.5`: http://tools.ietf.org/html/rfc6749#section-1.5 + .. _`Section 4.1.2`: http://tools.ietf.org/html/rfc7009#section-4.1.2 + + """ + if not is_secure_transport(url): + raise InsecureTransportError() + + params = [('token', token)] + + if token_type_hint: + params.append(('token_type_hint', token_type_hint)) + + for k in kwargs: + if kwargs[k]: + params.append((unicode_type(k), kwargs[k])) + + headers = {'Content-Type': 'application/x-www-form-urlencoded'} + + if callback: + params.append(('callback', callback)) + return add_params_to_uri(url, params), headers, body + else: + return url, headers, add_params_to_qs(body, params) + + +def parse_authorization_code_response(uri, state=None): + """Parse authorization grant response URI into a dict. + + If the resource owner grants the access request, the authorization + server issues an authorization code and delivers it to the client by + adding the following parameters to the query component of the + redirection URI using the ``application/x-www-form-urlencoded`` format: + + **code** + REQUIRED. The authorization code generated by the + authorization server. The authorization code MUST expire + shortly after it is issued to mitigate the risk of leaks. A + maximum authorization code lifetime of 10 minutes is + RECOMMENDED. The client MUST NOT use the authorization code + more than once. If an authorization code is used more than + once, the authorization server MUST deny the request and SHOULD + revoke (when possible) all tokens previously issued based on + that authorization code. The authorization code is bound to + the client identifier and redirection URI. + + **state** + REQUIRED if the "state" parameter was present in the client + authorization request. The exact value received from the + client. + + :param uri: The full redirect URL back to the client. + :param state: The state parameter from the authorization request. + + For example, the authorization server redirects the user-agent by + sending the following HTTP response: + + .. code-block:: http + + HTTP/1.1 302 Found + Location: https://client.example.com/cb?code=SplxlOBeZQQYbYS6WxSbIA + &state=xyz + + """ + if not is_secure_transport(uri): + raise InsecureTransportError() + + query = urlparse.urlparse(uri).query + params = dict(urlparse.parse_qsl(query)) + + if not 'code' in params: + raise MissingCodeError("Missing code parameter in response.") + + if state and params.get('state', None) != state: + raise MismatchingStateError() + + return params + + +def parse_implicit_response(uri, state=None, scope=None): + """Parse the implicit token response URI into a dict. + + If the resource owner grants the access request, the authorization + server issues an access token and delivers it to the client by adding + the following parameters to the fragment component of the redirection + URI using the ``application/x-www-form-urlencoded`` format: + + **access_token** + REQUIRED. The access token issued by the authorization server. + + **token_type** + REQUIRED. The type of the token issued as described in + Section 7.1. Value is case insensitive. + + **expires_in** + RECOMMENDED. The lifetime in seconds of the access token. For + example, the value "3600" denotes that the access token will + expire in one hour from the time the response was generated. + If omitted, the authorization server SHOULD provide the + expiration time via other means or document the default value. + + **scope** + OPTIONAL, if identical to the scope requested by the client, + otherwise REQUIRED. The scope of the access token as described + by Section 3.3. + + **state** + REQUIRED if the "state" parameter was present in the client + authorization request. The exact value received from the + client. + + Similar to the authorization code response, but with a full token provided + in the URL fragment: + + .. code-block:: http + + HTTP/1.1 302 Found + Location: http://example.com/cb#access_token=2YotnFZFEjr1zCsicMWpAA + &state=xyz&token_type=example&expires_in=3600 + """ + if not is_secure_transport(uri): + raise InsecureTransportError() + + fragment = urlparse.urlparse(uri).fragment + params = dict(urlparse.parse_qsl(fragment, keep_blank_values=True)) + + if 'scope' in params: + params['scope'] = scope_to_list(params['scope']) + + if 'expires_in' in params: + params['expires_at'] = time.time() + int(params['expires_in']) + + if state and params.get('state', None) != state: + raise ValueError("Mismatching or missing state in params.") + + params = OAuth2Token(params, old_scope=scope) + validate_token_parameters(params) + return params + + +def parse_token_response(body, scope=None): + """Parse the JSON token response body into a dict. + + The authorization server issues an access token and optional refresh + token, and constructs the response by adding the following parameters + to the entity body of the HTTP response with a 200 (OK) status code: + + access_token + REQUIRED. The access token issued by the authorization server. + token_type + REQUIRED. The type of the token issued as described in + `Section 7.1`_. Value is case insensitive. + expires_in + RECOMMENDED. The lifetime in seconds of the access token. For + example, the value "3600" denotes that the access token will + expire in one hour from the time the response was generated. + If omitted, the authorization server SHOULD provide the + expiration time via other means or document the default value. + refresh_token + OPTIONAL. The refresh token which can be used to obtain new + access tokens using the same authorization grant as described + in `Section 6`_. + scope + OPTIONAL, if identical to the scope requested by the client, + otherwise REQUIRED. The scope of the access token as described + by `Section 3.3`_. + + The parameters are included in the entity body of the HTTP response + using the "application/json" media type as defined by [`RFC4627`_]. The + parameters are serialized into a JSON structure by adding each + parameter at the highest structure level. Parameter names and string + values are included as JSON strings. Numerical values are included + as JSON numbers. The order of parameters does not matter and can + vary. + + :param body: The full json encoded response body. + :param scope: The scope requested during authorization. + + For example: + + .. code-block:: http + + HTTP/1.1 200 OK + Content-Type: application/json + Cache-Control: no-store + Pragma: no-cache + + { + "access_token":"2YotnFZFEjr1zCsicMWpAA", + "token_type":"example", + "expires_in":3600, + "refresh_token":"tGzv3JOkF0XG5Qx2TlKWIA", + "example_parameter":"example_value" + } + + .. _`Section 7.1`: http://tools.ietf.org/html/rfc6749#section-7.1 + .. _`Section 6`: http://tools.ietf.org/html/rfc6749#section-6 + .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 + .. _`RFC4627`: http://tools.ietf.org/html/rfc4627 + """ + try: + params = json.loads(body) + except ValueError: + + # Fall back to URL-encoded string, to support old implementations, + # including (at time of writing) Facebook. See: + # https://github.com/idan/oauthlib/issues/267 + + params = dict(urlparse.parse_qsl(body)) + for key in ('expires_in', 'expires'): + if key in params: # cast a couple things to int + params[key] = int(params[key]) + + if 'scope' in params: + params['scope'] = scope_to_list(params['scope']) + + if 'expires' in params: + params['expires_in'] = params.pop('expires') + + if 'expires_in' in params: + params['expires_at'] = time.time() + int(params['expires_in']) + + params = OAuth2Token(params, old_scope=scope) + validate_token_parameters(params) + return params + + +def validate_token_parameters(params): + """Ensures token precence, token type, expiration and scope in params.""" + if 'error' in params: + raise_from_error(params.get('error'), params) + + if not 'access_token' in params: + raise MissingTokenError(description="Missing access token parameter.") + + if not 'token_type' in params: + if os.environ.get('OAUTHLIB_STRICT_TOKEN_TYPE'): + raise MissingTokenTypeError() + + # If the issued access token scope is different from the one requested by + # the client, the authorization server MUST include the "scope" response + # parameter to inform the client of the actual scope granted. + # http://tools.ietf.org/html/rfc6749#section-3.3 + if params.scope_changed: + message = 'Scope has changed from "{old}" to "{new}".'.format( + old=params.old_scope, new=params.scope, + ) + scope_changed.send(message=message, old=params.old_scopes, new=params.scopes) + if not os.environ.get('OAUTHLIB_RELAX_TOKEN_SCOPE', None): + w = Warning(message) + w.token = params + w.old_scope = params.old_scopes + w.new_scope = params.scopes + raise w diff --git a/oauthlib/oauth2/rfc6749/request_validator.py b/oauthlib/oauth2/rfc6749/request_validator.py new file mode 100644 index 0000000..e622ff1 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/request_validator.py @@ -0,0 +1,460 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.oauth2.rfc6749.grant_types +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +""" +from __future__ import unicode_literals, absolute_import + +import logging + +log = logging.getLogger(__name__) + + +class RequestValidator(object): + + def client_authentication_required(self, request, *args, **kwargs): + """Determine if client authentication is required for current request. + + According to the rfc6749, client authentication is required in the following cases: + - Resource Owner Password Credentials Grant, when Client type is Confidential or when + Client was issued client credentials or whenever Client provided client + authentication, see `Section 4.3.2`_. + - Authorization Code Grant, when Client type is Confidential or when Client was issued + client credentials or whenever Client provided client authentication, + see `Section 4.1.3`_. + - Refresh Token Grant, when Client type is Confidential or when Client was issued + client credentials or whenever Client provided client authentication, see + `Section 6`_ + + :param request: oauthlib.common.Request + :rtype: True or False + + Method is used by: + - Authorization Code Grant + - Resource Owner Password Credentials Grant + - Refresh Token Grant + + .. _`Section 4.3.2`: http://tools.ietf.org/html/rfc6749#section-4.3.2 + .. _`Section 4.1.3`: http://tools.ietf.org/html/rfc6749#section-4.1.3 + .. _`Section 6`: http://tools.ietf.org/html/rfc6749#section-6 + """ + return True + + def authenticate_client(self, request, *args, **kwargs): + """Authenticate client through means outside the OAuth 2 spec. + + Means of authentication is negotiated beforehand and may for example + be `HTTP Basic Authentication Scheme`_ which utilizes the Authorization + header. + + Headers may be accesses through request.headers and parameters found in + both body and query can be obtained by direct attribute access, i.e. + request.client_id for client_id in the URL query. + + OBS! Certain grant types rely on this authentication, possibly with + other fallbacks, and for them to recognize this authorization please + set the client attribute on the request (request.client). Note that + preferably this client object should have a client_id attribute of + unicode type (request.client.client_id). + + :param request: oauthlib.common.Request + :rtype: True or False + + Method is used by: + - Authorization Code Grant + - Resource Owner Password Credentials Grant (may be disabled) + - Client Credentials Grant + - Refresh Token Grant + + .. _`HTTP Basic Authentication Scheme`: http://tools.ietf.org/html/rfc1945#section-11.1 + """ + raise NotImplementedError('Subclasses must implement this method.') + + def authenticate_client_id(self, client_id, request, *args, **kwargs): + """Ensure client_id belong to a non-confidential client. + + A non-confidential client is one that is not required to authenticate + through other means, such as using HTTP Basic. + + Note, while not strictly necessary it can often be very convenient + to set request.client to the client object associated with the + given client_id. + + :param request: oauthlib.common.Request + :rtype: True or False + + Method is used by: + - Authorization Code Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def confirm_redirect_uri(self, client_id, code, redirect_uri, client, + *args, **kwargs): + """Ensure client is authorized to redirect to the redirect_uri requested. + + If the client specifies a redirect_uri when obtaining code then + that redirect URI must be bound to the code and verified equal + in this method. + + All clients should register the absolute URIs of all URIs they intend + to redirect to. The registration is outside of the scope of oauthlib. + + :param client_id: Unicode client identifier + :param code: Unicode authorization_code. + :param redirect_uri: Unicode absolute URI + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Authorization Code Grant (during token request) + """ + raise NotImplementedError('Subclasses must implement this method.') + + def get_default_redirect_uri(self, client_id, request, *args, **kwargs): + """Get the default redirect URI for the client. + + :param client_id: Unicode client identifier + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: The default redirect URI for the client + + Method is used by: + - Authorization Code Grant + - Implicit Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def get_default_scopes(self, client_id, request, *args, **kwargs): + """Get the default scopes for the client. + + :param client_id: Unicode client identifier + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: List of default scopes + + Method is used by all core grant types: + - Authorization Code Grant + - Implicit Grant + - Resource Owner Password Credentials Grant + - Client Credentials grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def get_original_scopes(self, refresh_token, request, *args, **kwargs): + """Get the list of scopes associated with the refresh token. + + :param refresh_token: Unicode refresh token + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: List of scopes. + + Method is used by: + - Refresh token grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def is_within_original_scope(self, request_scopes, refresh_token, request, *args, **kwargs): + """Check if requested scopes are within a scope of the refresh token. + + When access tokens are refreshed the scope of the new token + needs to be within the scope of the original token. This is + ensured by checking that all requested scopes strings are on + the list returned by the get_original_scopes. If this check + fails, is_within_original_scope is called. The method can be + used in situations where returning all valid scopes from the + get_original_scopes is not practical. + + :param request_scopes: A list of scopes that were requested by client + :param refresh_token: Unicode refresh_token + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Refresh token grant + """ + return False + + def invalidate_authorization_code(self, client_id, code, request, *args, **kwargs): + """Invalidate an authorization code after use. + + :param client_id: Unicode client identifier + :param code: The authorization code grant (request.code). + :param request: The HTTP Request (oauthlib.common.Request) + + Method is used by: + - Authorization Code Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def revoke_token(self, token, token_type_hint, request, *args, **kwargs): + """Revoke an access or refresh token. + + :param token: The token string. + :param token_type_hint: access_token or refresh_token. + :param request: The HTTP Request (oauthlib.common.Request) + + Method is used by: + - Revocation Endpoint + """ + raise NotImplementedError('Subclasses must implement this method.') + + def rotate_refresh_token(self, request): + """Determine whether to rotate the refresh token. Default, yes. + + When access tokens are refreshed the old refresh token can be kept + or replaced with a new one (rotated). Return True to rotate and + and False for keeping original. + + :param request: oauthlib.common.Request + :rtype: True or False + + Method is used by: + - Refresh Token Grant + """ + return True + + def save_authorization_code(self, client_id, code, request, *args, **kwargs): + """Persist the authorization_code. + + The code should at minimum be associated with: + - a client and it's client_id + - the redirect URI used (request.redirect_uri) + - whether the redirect URI used is the client default or not + - a resource owner / user (request.user) + - authorized scopes (request.scopes) + + The authorization code grant dict (code) holds at least the key 'code':: + + {'code': 'sdf345jsdf0934f'} + + :param client_id: Unicode client identifier + :param code: A dict of the authorization code grant. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: The default redirect URI for the client + + Method is used by: + - Authorization Code Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def save_bearer_token(self, token, request, *args, **kwargs): + """Persist the Bearer token. + + The Bearer token should at minimum be associated with: + - a client and it's client_id, if available + - a resource owner / user (request.user) + - authorized scopes (request.scopes) + - an expiration time + - a refresh token, if issued + + The Bearer token dict may hold a number of items:: + + { + 'token_type': 'Bearer', + 'access_token': 'askfjh234as9sd8', + 'expires_in': 3600, + 'scope': 'string of space separated authorized scopes', + 'refresh_token': '23sdf876234', # if issued + 'state': 'given_by_client', # if supplied by client + } + + Note that while "scope" is a string-separated list of authorized scopes, + the original list is still available in request.scopes + + :param client_id: Unicode client identifier + :param token: A Bearer token dict + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: The default redirect URI for the client + + Method is used by all core grant types issuing Bearer tokens: + - Authorization Code Grant + - Implicit Grant + - Resource Owner Password Credentials Grant (might not associate a client) + - Client Credentials grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_bearer_token(self, token, scopes, request): + """Ensure the Bearer token is valid and authorized access to scopes. + + :param token: A string of random characters. + :param scopes: A list of scopes associated with the protected resource. + :param request: The HTTP Request (oauthlib.common.Request) + + A key to OAuth 2 security and restricting impact of leaked tokens is + the short expiration time of tokens, *always ensure the token has not + expired!*. + + Two different approaches to scope validation: + + 1) all(scopes). The token must be authorized access to all scopes + associated with the resource. For example, the + token has access to ``read-only`` and ``images``, + thus the client can view images but not upload new. + Allows for fine grained access control through + combining various scopes. + + 2) any(scopes). The token must be authorized access to one of the + scopes associated with the resource. For example, + token has access to ``read-only-images``. + Allows for fine grained, although arguably less + convenient, access control. + + A powerful way to use scopes would mimic UNIX ACLs and see a scope + as a group with certain privileges. For a restful API these might + map to HTTP verbs instead of read, write and execute. + + Note, the request.user attribute can be set to the resource owner + associated with this token. Similarly the request.client and + request.scopes attribute can be set to associated client object + and authorized scopes. If you then use a decorator such as the + one provided for django these attributes will be made available + in all protected views as keyword arguments. + + :param token: Unicode Bearer token + :param scopes: List of scopes (defined by you) + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is indirectly used by all core Bearer token issuing grant types: + - Authorization Code Grant + - Implicit Grant + - Resource Owner Password Credentials Grant + - Client Credentials Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_client_id(self, client_id, request, *args, **kwargs): + """Ensure client_id belong to a valid and active client. + + Note, while not strictly necessary it can often be very convenient + to set request.client to the client object associated with the + given client_id. + + :param request: oauthlib.common.Request + :rtype: True or False + + Method is used by: + - Authorization Code Grant + - Implicit Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_code(self, client_id, code, client, request, *args, **kwargs): + """Ensure the authorization_code is valid and assigned to client. + + OBS! The request.user attribute should be set to the resource owner + associated with this authorization code. Similarly request.scopes and + request.state must also be set. + + :param client_id: Unicode client identifier + :param code: Unicode authorization code + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Authorization Code Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_grant_type(self, client_id, grant_type, client, request, *args, **kwargs): + """Ensure client is authorized to use the grant_type requested. + + :param client_id: Unicode client identifier + :param grant_type: Unicode grant type, i.e. authorization_code, password. + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Authorization Code Grant + - Resource Owner Password Credentials Grant + - Client Credentials Grant + - Refresh Token Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_redirect_uri(self, client_id, redirect_uri, request, *args, **kwargs): + """Ensure client is authorized to redirect to the redirect_uri requested. + + All clients should register the absolute URIs of all URIs they intend + to redirect to. The registration is outside of the scope of oauthlib. + + :param client_id: Unicode client identifier + :param redirect_uri: Unicode absolute URI + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Authorization Code Grant + - Implicit Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_refresh_token(self, refresh_token, client, request, *args, **kwargs): + """Ensure the Bearer token is valid and authorized access to scopes. + + OBS! The request.user attribute should be set to the resource owner + associated with this refresh token. + + :param refresh_token: Unicode refresh token + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Authorization Code Grant (indirectly by issuing refresh tokens) + - Resource Owner Password Credentials Grant (also indirectly) + - Refresh Token Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_response_type(self, client_id, response_type, client, request, *args, **kwargs): + """Ensure client is authorized to use the response_type requested. + + :param client_id: Unicode client identifier + :param response_type: Unicode response type, i.e. code, token. + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Authorization Code Grant + - Implicit Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_scopes(self, client_id, scopes, client, request, *args, **kwargs): + """Ensure the client is authorized access to requested scopes. + + :param client_id: Unicode client identifier + :param scopes: List of scopes (defined by you) + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by all core grant types: + - Authorization Code Grant + - Implicit Grant + - Resource Owner Password Credentials Grant + - Client Credentials Grant + """ + raise NotImplementedError('Subclasses must implement this method.') + + def validate_user(self, username, password, client, request, *args, **kwargs): + """Ensure the username and password is valid. + + OBS! The validation should also set the user attribute of the request + to a valid resource owner, i.e. request.user = username or similar. If + not set you will be unable to associate a token with a user in the + persistance method used (commonly, save_bearer_token). + + :param username: Unicode username + :param password: Unicode password + :param client: Client object set by you, see authenticate_client. + :param request: The HTTP Request (oauthlib.common.Request) + :rtype: True or False + + Method is used by: + - Resource Owner Password Credentials Grant + """ + raise NotImplementedError('Subclasses must implement this method.') diff --git a/oauthlib/oauth2/rfc6749/tokens.py b/oauthlib/oauth2/rfc6749/tokens.py new file mode 100644 index 0000000..3252e90 --- /dev/null +++ b/oauthlib/oauth2/rfc6749/tokens.py @@ -0,0 +1,294 @@ +""" +oauthlib.oauth2.rfc6749.tokens +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +This module contains methods for adding two types of access tokens to requests. + +- Bearer http://tools.ietf.org/html/rfc6750 +- MAC http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01 +""" +from __future__ import absolute_import, unicode_literals + +from binascii import b2a_base64 +import hashlib +import hmac +try: + from urlparse import urlparse +except ImportError: + from urllib.parse import urlparse + +from oauthlib.common import add_params_to_uri, add_params_to_qs, unicode_type +from oauthlib import common + +from . import utils + + +class OAuth2Token(dict): + + def __init__(self, params, old_scope=None): + super(OAuth2Token, self).__init__(params) + self._new_scope = None + if 'scope' in params: + self._new_scope = set(utils.scope_to_list(params['scope'])) + if old_scope is not None: + self._old_scope = set(utils.scope_to_list(old_scope)) + if self._new_scope is None: + # the rfc says that if the scope hasn't changed, it's optional + # in params so set the new scope to the old scope + self._new_scope = self._old_scope + else: + self._old_scope = self._new_scope + + @property + def scope_changed(self): + return self._new_scope != self._old_scope + + @property + def old_scope(self): + return utils.list_to_scope(self._old_scope) + + @property + def old_scopes(self): + return list(self._old_scope) + + @property + def scope(self): + return utils.list_to_scope(self._new_scope) + + @property + def scopes(self): + return list(self._new_scope) + + @property + def missing_scopes(self): + return list(self._old_scope - self._new_scope) + + @property + def additional_scopes(self): + return list(self._new_scope - self._old_scope) + + +def prepare_mac_header(token, uri, key, http_method, + nonce=None, + headers=None, + body=None, + ext='', + hash_algorithm='hmac-sha-1', + issue_time=None, + draft=0): + """Add an `MAC Access Authentication`_ signature to headers. + + Unlike OAuth 1, this HMAC signature does not require inclusion of the + request payload/body, neither does it use a combination of client_secret + and token_secret but rather a mac_key provided together with the access + token. + + Currently two algorithms are supported, "hmac-sha-1" and "hmac-sha-256", + `extension algorithms`_ are not supported. + + Example MAC Authorization header, linebreaks added for clarity + + Authorization: MAC id="h480djs93hd8", + nonce="1336363200:dj83hs9s", + mac="bhCQXTVyfj5cmA9uKkPFx1zeOXM=" + + .. _`MAC Access Authentication`: http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01 + .. _`extension algorithms`: http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-7.1 + + :param uri: Request URI. + :param headers: Request headers as a dictionary. + :param http_method: HTTP Request method. + :param key: MAC given provided by token endpoint. + :param hash_algorithm: HMAC algorithm provided by token endpoint. + :param issue_time: Time when the MAC credentials were issued (datetime). + :param draft: MAC authentication specification version. + :return: headers dictionary with the authorization field added. + """ + http_method = http_method.upper() + host, port = utils.host_from_uri(uri) + + if hash_algorithm.lower() == 'hmac-sha-1': + h = hashlib.sha1 + elif hash_algorithm.lower() == 'hmac-sha-256': + h = hashlib.sha256 + else: + raise ValueError('unknown hash algorithm') + + if draft == 0: + nonce = nonce or '{0}:{1}'.format(utils.generate_age(issue_time), + common.generate_nonce()) + else: + ts = common.generate_timestamp() + nonce = common.generate_nonce() + + sch, net, path, par, query, fra = urlparse(uri) + + if query: + request_uri = path + '?' + query + else: + request_uri = path + + # Hash the body/payload + if body is not None and draft == 0: + body = body.encode('utf-8') + bodyhash = b2a_base64(h(body).digest())[:-1].decode('utf-8') + else: + bodyhash = '' + + # Create the normalized base string + base = [] + if draft == 0: + base.append(nonce) + else: + base.append(ts) + base.append(nonce) + base.append(http_method.upper()) + base.append(request_uri) + base.append(host) + base.append(port) + if draft == 0: + base.append(bodyhash) + base.append(ext or '') + base_string = '\n'.join(base) + '\n' + + # hmac struggles with unicode strings - http://bugs.python.org/issue5285 + if isinstance(key, unicode_type): + key = key.encode('utf-8') + sign = hmac.new(key, base_string.encode('utf-8'), h) + sign = b2a_base64(sign.digest())[:-1].decode('utf-8') + + header = [] + header.append('MAC id="%s"' % token) + if draft != 0: + header.append('ts="%s"' % ts) + header.append('nonce="%s"' % nonce) + if bodyhash: + header.append('bodyhash="%s"' % bodyhash) + if ext: + header.append('ext="%s"' % ext) + header.append('mac="%s"' % sign) + + headers = headers or {} + headers['Authorization'] = ', '.join(header) + return headers + + +def prepare_bearer_uri(token, uri): + """Add a `Bearer Token`_ to the request URI. + Not recommended, use only if client can't use authorization header or body. + + http://www.example.com/path?access_token=h480djs93hd8 + + .. _`Bearer Token`: http://tools.ietf.org/html/rfc6750 + """ + return add_params_to_uri(uri, [(('access_token', token))]) + + +def prepare_bearer_headers(token, headers=None): + """Add a `Bearer Token`_ to the request URI. + Recommended method of passing bearer tokens. + + Authorization: Bearer h480djs93hd8 + + .. _`Bearer Token`: http://tools.ietf.org/html/rfc6750 + """ + headers = headers or {} + headers['Authorization'] = 'Bearer %s' % token + return headers + + +def prepare_bearer_body(token, body=''): + """Add a `Bearer Token`_ to the request body. + + access_token=h480djs93hd8 + + .. _`Bearer Token`: http://tools.ietf.org/html/rfc6750 + """ + return add_params_to_qs(body, [(('access_token', token))]) + + +def random_token_generator(request, refresh_token=False): + return common.generate_token() + + +def signed_token_generator(private_pem, **kwargs): + def signed_token_generator(request): + request.claims = kwargs + return common.generate_signed_token(private_pem, request) + + return signed_token_generator + + +class TokenBase(object): + + def __call__(self, request, refresh_token=False): + raise NotImplementedError('Subclasses must implement this method.') + + def validate_request(self, request): + raise NotImplementedError('Subclasses must implement this method.') + + def estimate_type(self, request): + raise NotImplementedError('Subclasses must implement this method.') + + +class BearerToken(TokenBase): + + def __init__(self, request_validator=None, token_generator=None, + expires_in=None, refresh_token_generator=None): + self.request_validator = request_validator + self.token_generator = token_generator or random_token_generator + self.refresh_token_generator = ( + refresh_token_generator or self.token_generator + ) + self.expires_in = expires_in or 3600 + + def create_token(self, request, refresh_token=False): + """Create a BearerToken, by default without refresh token.""" + + if callable(self.expires_in): + expires_in = self.expires_in(request) + else: + expires_in = self.expires_in + + request.expires_in = expires_in + + token = { + 'access_token': self.token_generator(request), + 'expires_in': expires_in, + 'token_type': 'Bearer', + } + + if request.scopes is not None: + token['scope'] = ' '.join(request.scopes) + + if request.state is not None: + token['state'] = request.state + + if refresh_token: + if (request.refresh_token and + not self.request_validator.rotate_refresh_token(request)): + token['refresh_token'] = request.refresh_token + else: + token['refresh_token'] = self.refresh_token_generator(request) + + token.update(request.extra_credentials or {}) + token = OAuth2Token(token) + self.request_validator.save_bearer_token(token, request) + return token + + def validate_request(self, request): + token = None + if 'Authorization' in request.headers: + token = request.headers.get('Authorization')[7:] + else: + token = request.access_token + return self.request_validator.validate_bearer_token( + token, request.scopes, request) + + def estimate_type(self, request): + if request.headers.get('Authorization', '').startswith('Bearer'): + return 9 + elif request.access_token is not None: + return 5 + else: + return 0 diff --git a/oauthlib/oauth2/rfc6749/utils.py b/oauthlib/oauth2/rfc6749/utils.py new file mode 100644 index 0000000..6a8e24b --- /dev/null +++ b/oauthlib/oauth2/rfc6749/utils.py @@ -0,0 +1,96 @@ +# -*- coding: utf-8 -*- +""" +oauthlib.utils +~~~~~~~~~~~~~~ + +This module contains utility methods used by various parts of the OAuth 2 spec. +""" +from __future__ import absolute_import, unicode_literals + +import os +import datetime +try: + from urllib import quote +except ImportError: + from urllib.parse import quote +try: + from urlparse import urlparse +except ImportError: + from urllib.parse import urlparse +from oauthlib.common import unicode_type, urldecode + + +def list_to_scope(scope): + """Convert a list of scopes to a space separated string.""" + if isinstance(scope, unicode_type) or scope is None: + return scope + elif isinstance(scope, (tuple, list)): + return " ".join([unicode_type(s) for s in scope]) + elif isinstance(scope, set): + return list_to_scope(list(scope)) + else: + raise ValueError("Invalid scope, must be string or list.") + + +def scope_to_list(scope): + """Convert a space separated string to a list of scopes.""" + if isinstance(scope, list): + return [unicode_type(s) for s in scope] + if isinstance(scope, set): + scope_to_list(list(scope)) + elif scope is None: + return None + else: + return scope.strip().split(" ") + + +def params_from_uri(uri): + params = dict(urldecode(urlparse(uri).query)) + if 'scope' in params: + params['scope'] = scope_to_list(params['scope']) + return params + + +def host_from_uri(uri): + """Extract hostname and port from URI. + + Will use default port for HTTP and HTTPS if none is present in the URI. + """ + default_ports = { + 'HTTP': '80', + 'HTTPS': '443', + } + + sch, netloc, path, par, query, fra = urlparse(uri) + if ':' in netloc: + netloc, port = netloc.split(':', 1) + else: + port = default_ports.get(sch.upper()) + + return netloc, port + + +def escape(u): + """Escape a string in an OAuth-compatible fashion. + + TODO: verify whether this can in fact be used for OAuth 2 + + """ + if not isinstance(u, unicode_type): + raise ValueError('Only unicode objects are escapable.') + return quote(u.encode('utf-8'), safe=b'~') + + +def generate_age(issue_time): + """Generate a age parameter for MAC authentication draft 00.""" + td = datetime.datetime.now() - issue_time + age = (td.microseconds + (td.seconds + td.days * 24 * 3600) + * 10 ** 6) / 10 ** 6 + return unicode_type(age) + + +def is_secure_transport(uri): + """Check if the uri is over ssl.""" + if os.environ.get('OAUTHLIB_INSECURE_TRANSPORT'): + return True + return uri.lower().startswith('https://') diff --git a/oauthlib/signals.py b/oauthlib/signals.py new file mode 100644 index 0000000..2f86650 --- /dev/null +++ b/oauthlib/signals.py @@ -0,0 +1,41 @@ +# -*- coding: utf-8 -*- +""" + Implements signals based on blinker if available, otherwise + falls silently back to a noop. Shamelessly stolen from flask.signals: + https://github.com/mitsuhiko/flask/blob/master/flask/signals.py +""" +signals_available = False +try: + from blinker import Namespace + signals_available = True +except ImportError: + class Namespace(object): + def signal(self, name, doc=None): + return _FakeSignal(name, doc) + + class _FakeSignal(object): + """If blinker is unavailable, create a fake class with the same + interface that allows sending of signals but will fail with an + error on anything else. Instead of doing anything on send, it + will just ignore the arguments and do nothing instead. + """ + + def __init__(self, name, doc=None): + self.name = name + self.__doc__ = doc + def _fail(self, *args, **kwargs): + raise RuntimeError('signalling support is unavailable ' + 'because the blinker library is ' + 'not installed.') + send = lambda *a, **kw: None + connect = disconnect = has_receivers_for = receivers_for = \ + temporarily_connected_to = connected_to = _fail + del _fail + +# The namespace for code signals. If you are not oauthlib code, do +# not put signals in here. Create your own namespace instead. +_signals = Namespace() + + +# Core signals. +scope_changed = _signals.signal('scope-changed') diff --git a/oauthlib/uri_validate.py b/oauthlib/uri_validate.py new file mode 100644 index 0000000..e553f32 --- /dev/null +++ b/oauthlib/uri_validate.py @@ -0,0 +1,215 @@ +""" +Regex for URIs + +These regex are directly derived from the collected ABNF in RFC3986 +(except for DIGIT, ALPHA and HEXDIG, defined by RFC2234). + +They should be processed with re.VERBOSE. + +Thanks Mark Nottingham for this code - https://gist.github.com/138549 +""" +from __future__ import unicode_literals +import re + +# basics + +DIGIT = r"[\x30-\x39]" + +ALPHA = r"[\x41-\x5A\x61-\x7A]" + +HEXDIG = r"[\x30-\x39A-Fa-f]" + +# pct-encoded = "%" HEXDIG HEXDIG +pct_encoded = r" %% %(HEXDIG)s %(HEXDIG)s" % locals() + +# unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" +unreserved = r"(?: %(ALPHA)s | %(DIGIT)s | \- | \. | _ | ~ )" % locals() + +# gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" +gen_delims = r"(?: : | / | \? | \# | \[ | \] | @ )" + +# sub-delims = "!" / "$" / "&" / "'" / "(" / ")" +# / "*" / "+" / "," / ";" / "=" +sub_delims = r"""(?: ! | \$ | & | ' | \( | \) | + \* | \+ | , | ; | = )""" + +# pchar = unreserved / pct-encoded / sub-delims / ":" / "@" +pchar = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : | @ )" % locals( +) + +# reserved = gen-delims / sub-delims +reserved = r"(?: %(gen_delims)s | %(sub_delims)s )" % locals() + + +# scheme + +# scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) +scheme = r"%(ALPHA)s (?: %(ALPHA)s | %(DIGIT)s | \+ | \- | \. )*" % locals() + + +# authority + +# dec-octet = DIGIT ; 0-9 +# / %x31-39 DIGIT ; 10-99 +# / "1" 2DIGIT ; 100-199 +# / "2" %x30-34 DIGIT ; 200-249 +# / "25" %x30-35 ; 250-255 +dec_octet = r"""(?: %(DIGIT)s | + [\x31-\x39] %(DIGIT)s | + 1 %(DIGIT)s{2} | + 2 [\x30-\x34] %(DIGIT)s | + 25 [\x30-\x35] + ) +""" % locals() + +# IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet +IPv4address = r"%(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s" % locals( +) + +# h16 = 1*4HEXDIG +h16 = r"(?: %(HEXDIG)s ){1,4}" % locals() + +# ls32 = ( h16 ":" h16 ) / IPv4address +ls32 = r"(?: (?: %(h16)s : %(h16)s ) | %(IPv4address)s )" % locals() + +# IPv6address = 6( h16 ":" ) ls32 +# / "::" 5( h16 ":" ) ls32 +# / [ h16 ] "::" 4( h16 ":" ) ls32 +# / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32 +# / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32 +# / [ *3( h16 ":" ) h16 ] "::" h16 ":" ls32 +# / [ *4( h16 ":" ) h16 ] "::" ls32 +# / [ *5( h16 ":" ) h16 ] "::" h16 +# / [ *6( h16 ":" ) h16 ] "::" +IPv6address = r"""(?: (?: %(h16)s : ){6} %(ls32)s | + :: (?: %(h16)s : ){5} %(ls32)s | + %(h16)s :: (?: %(h16)s : ){4} %(ls32)s | + (?: %(h16)s : ) %(h16)s :: (?: %(h16)s : ){3} %(ls32)s | + (?: %(h16)s : ){2} %(h16)s :: (?: %(h16)s : ){2} %(ls32)s | + (?: %(h16)s : ){3} %(h16)s :: %(h16)s : %(ls32)s | + (?: %(h16)s : ){4} %(h16)s :: %(ls32)s | + (?: %(h16)s : ){5} %(h16)s :: %(h16)s | + (?: %(h16)s : ){6} %(h16)s :: + ) +""" % locals() + +# IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" ) +IPvFuture = r"v %(HEXDIG)s+ \. (?: %(unreserved)s | %(sub_delims)s | : )+" % locals() + +# IP-literal = "[" ( IPv6address / IPvFuture ) "]" +IP_literal = r"\[ (?: %(IPv6address)s | %(IPvFuture)s ) \]" % locals() + +# reg-name = *( unreserved / pct-encoded / sub-delims ) +reg_name = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s )*" % locals() + +# userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) +userinfo = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : )" % locals( +) + +# host = IP-literal / IPv4address / reg-name +host = r"(?: %(IP_literal)s | %(IPv4address)s | %(reg_name)s )" % locals() + +# port = *DIGIT +port = r"(?: %(DIGIT)s )*" % locals() + +# authority = [ userinfo "@" ] host [ ":" port ] +authority = r"(?: %(userinfo)s @)? %(host)s (?: : %(port)s)?" % locals() + +# Path + +# segment = *pchar +segment = r"%(pchar)s*" % locals() + +# segment-nz = 1*pchar +segment_nz = r"%(pchar)s+" % locals() + +# segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" ) +# ; non-zero-length segment without any colon ":" +segment_nz_nc = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | @ )+" % locals() + +# path-abempty = *( "/" segment ) +path_abempty = r"(?: / %(segment)s )*" % locals() + +# path-absolute = "/" [ segment-nz *( "/" segment ) ] +path_absolute = r"/ (?: %(segment_nz)s (?: / %(segment)s )* )?" % locals() + +# path-noscheme = segment-nz-nc *( "/" segment ) +path_noscheme = r"%(segment_nz_nc)s (?: / %(segment)s )*" % locals() + +# path-rootless = segment-nz *( "/" segment ) +path_rootless = r"%(segment_nz)s (?: / %(segment)s )*" % locals() + +# path-empty = 0 +path_empty = r"" # FIXME + +# path = path-abempty ; begins with "/" or is empty +# / path-absolute ; begins with "/" but not "//" +# / path-noscheme ; begins with a non-colon segment +# / path-rootless ; begins with a segment +# / path-empty ; zero characters +path = r"""(?: %(path_abempty)s | + %(path_absolute)s | + %(path_noscheme)s | + %(path_rootless)s | + %(path_empty)s + ) +""" % locals() + +### Query and Fragment + +# query = *( pchar / "/" / "?" ) +query = r"(?: %(pchar)s | / | \? )*" % locals() + +# fragment = *( pchar / "/" / "?" ) +fragment = r"(?: %(pchar)s | / | \? )*" % locals() + +# URIs + +# hier-part = "//" authority path-abempty +# / path-absolute +# / path-rootless +# / path-empty +hier_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) | + %(path_absolute)s | + %(path_rootless)s | + %(path_empty)s + ) +""" % locals() + +# relative-part = "//" authority path-abempty +# / path-absolute +# / path-noscheme +# / path-empty +relative_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) | + %(path_absolute)s | + %(path_noscheme)s | + %(path_empty)s + ) +""" % locals() + +# relative-ref = relative-part [ "?" query ] [ "#" fragment ] +relative_ref = r"%(relative_part)s (?: \? %(query)s)? (?: \# %(fragment)s)?" % locals( +) + +# URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] +URI = r"^(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? (?: \# %(fragment)s )? )$" % locals( +) + +# URI-reference = URI / relative-ref +URI_reference = r"^(?: %(URI)s | %(relative_ref)s )$" % locals() + +# absolute-URI = scheme ":" hier-part [ "?" query ] +absolute_URI = r"^(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? )$" % locals( +) + + +def is_uri(uri): + return re.match(URI, uri, re.VERBOSE) + + +def is_uri_reference(uri): + return re.match(URI_reference, uri, re.VERBOSE) + + +def is_absolute_uri(uri): + return re.match(absolute_URI, uri, re.VERBOSE) -- 2.30.2