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| # Copyright (c) 2014-2015, Erica Ehrhardt | |
| # Copyright (c) 2016, Patrick Uiterwijk <patrick@puiterwijk.org> | |
| # All rights reserved. | |
| # | |
| # Redistribution and use in source and binary forms, with or without | |
| # modification, are permitted provided that the following conditions are met: | |
| # | |
| # * Redistributions of source code must retain the above copyright notice, this | |
| # list of conditions and the following disclaimer. | |
| # | |
| # * Redistributions in binary form must reproduce the above copyright notice, | |
| # this list of conditions and the following disclaimer in the documentation | |
| # and/or other materials provided with the distribution. | |
| # | |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| from functools import wraps | |
| import os | |
| import json | |
| from base64 import b64encode, b64decode, urlsafe_b64encode, urlsafe_b64decode | |
| import time | |
| from copy import copy | |
| import logging | |
| from warnings import warn | |
| import calendar | |
| from six.moves.urllib.parse import urlencode | |
| from flask import request, session, redirect, url_for, g, current_app, abort | |
| from oauth2client.client import flow_from_clientsecrets, OAuth2WebServerFlow,\ | |
| AccessTokenRefreshError, OAuth2Credentials | |
| import httplib2 | |
| from itsdangerous import JSONWebSignatureSerializer, BadSignature | |
| __all__ = ['OpenIDConnect', 'MemoryCredentials'] | |
| logger = logging.getLogger(__name__) | |
| def _json_loads(content): | |
| if not isinstance(content, str): | |
| content = content.decode('utf-8') | |
| return json.loads(content) | |
| class MemoryCredentials(dict): | |
| """ | |
| Non-persistent local credentials store. | |
| Use this if you only have one app server, and don't mind making everyone | |
| log in again after a restart. | |
| """ | |
| pass | |
| class DummySecretsCache(object): | |
| """ | |
| oauth2client secrets cache | |
| """ | |
| def __init__(self, client_secrets): | |
| self.client_secrets = client_secrets | |
| def get(self, filename, namespace): | |
| return self.client_secrets | |
| class ErrStr(str): | |
| """ | |
| This is a class to work around the time I made a terrible API decision. | |
| Basically, the validate_token() function returns a boolean True if all went | |
| right, but a string with an error message if something went wrong. | |
| The problem here is that this means that "if validate_token(...)" will | |
| always be True, even with an invalid token, and users had to do | |
| "if validate_token(...) is True:". | |
| This is counter-intuitive, so let's "fix" this by returning instances of | |
| this ErrStr class, which are basic strings except for their bool() results: | |
| they return False. | |
| """ | |
| def __nonzero__(self): | |
| """The py2 method for bool().""" | |
| return False | |
| def __bool__(self): | |
| """The py3 method for bool().""" | |
| return False | |
| GOOGLE_ISSUERS = ['accounts.google.com', 'https://accounts.google.com'] | |
| class OpenIDConnect(object): | |
| """ | |
| The core OpenID Connect client object. | |
| """ | |
| def __init__(self, app=None, credentials_store=None, http=None, time=None, | |
| urandom=None): | |
| self.credentials_store = credentials_store\ | |
| if credentials_store is not None\ | |
| else MemoryCredentials() | |
| if http is not None: | |
| warn('HTTP argument is deprecated and unused', DeprecationWarning) | |
| if time is not None: | |
| warn('time argument is deprecated and unused', DeprecationWarning) | |
| if urandom is not None: | |
| warn('urandom argument is deprecated and unused', | |
| DeprecationWarning) | |
| # By default, we do not have a custom callback | |
| self._custom_callback = None | |
| # get stuff from the app's config, which may override stuff set above | |
| if app is not None: | |
| self.init_app(app) | |
| def init_app(self, app): | |
| """ | |
| Do setup that requires a Flask app. | |
| :param app: The application to initialize. | |
| :type app: Flask | |
| """ | |
| secrets = self.load_secrets(app) | |
| self.client_secrets = list(secrets.values())[0] | |
| secrets_cache = DummySecretsCache(secrets) | |
| # Set some default configuration options | |
| app.config.setdefault('OIDC_SCOPES', ['openid', 'email']) | |
| app.config.setdefault('OIDC_GOOGLE_APPS_DOMAIN', None) | |
| app.config.setdefault('OIDC_ID_TOKEN_COOKIE_NAME', 'oidc_id_token') | |
| app.config.setdefault('OIDC_ID_TOKEN_COOKIE_PATH', '/') | |
| app.config.setdefault('OIDC_ID_TOKEN_COOKIE_TTL', 7 * 86400) # 7 days | |
| # should ONLY be turned off for local debugging | |
| app.config.setdefault('OIDC_COOKIE_SECURE', True) | |
| app.config.setdefault('OIDC_VALID_ISSUERS', | |
| (self.client_secrets.get('issuer') or | |
| GOOGLE_ISSUERS)) | |
| app.config.setdefault('OIDC_CLOCK_SKEW', 60) # 1 minute | |
| app.config.setdefault('OIDC_REQUIRE_VERIFIED_EMAIL', False) | |
| app.config.setdefault('OIDC_OPENID_REALM', None) | |
| app.config.setdefault('OIDC_USER_INFO_ENABLED', True) | |
| app.config.setdefault('OIDC_CALLBACK_ROUTE', '/oidc_callback') | |
| app.config.setdefault('OVERWRITE_REDIRECT_URI', False) | |
| app.config.setdefault("OIDC_EXTRA_REQUEST_AUTH_PARAMS", {}) | |
| # Configuration for resource servers | |
| app.config.setdefault('OIDC_RESOURCE_SERVER_ONLY', False) | |
| app.config.setdefault('OIDC_RESOURCE_CHECK_AUD', False) | |
| # We use client_secret_post, because that's what the Google | |
| # oauth2client library defaults to | |
| app.config.setdefault('OIDC_INTROSPECTION_AUTH_METHOD', 'client_secret_post') | |
| app.config.setdefault('OIDC_TOKEN_TYPE_HINT', 'access_token') | |
| if not 'openid' in app.config['OIDC_SCOPES']: | |
| raise ValueError('The value "openid" must be in the OIDC_SCOPES') | |
| # register callback route and cookie-setting decorator | |
| if not app.config['OIDC_RESOURCE_SERVER_ONLY']: | |
| app.route(app.config['OIDC_CALLBACK_ROUTE'])(self._oidc_callback) | |
| app.before_request(self._before_request) | |
| app.after_request(self._after_request) | |
| # Initialize oauth2client | |
| self.flow = flow_from_clientsecrets( | |
| app.config['OIDC_CLIENT_SECRETS'], | |
| scope=app.config['OIDC_SCOPES'], | |
| cache=secrets_cache) | |
| assert isinstance(self.flow, OAuth2WebServerFlow) | |
| # create signers using the Flask secret key | |
| self.extra_data_serializer = JSONWebSignatureSerializer( | |
| app.config['SECRET_KEY'], salt='flask-oidc-extra-data') | |
| self.cookie_serializer = JSONWebSignatureSerializer( | |
| app.config['SECRET_KEY'], salt='flask-oidc-cookie') | |
| try: | |
| self.credentials_store = app.config['OIDC_CREDENTIALS_STORE'] | |
| except KeyError: | |
| pass | |
| def load_secrets(self, app): | |
| # Load client_secrets.json to pre-initialize some configuration | |
| content = app.config['OIDC_CLIENT_SECRETS'] | |
| if isinstance(content, dict): | |
| return content | |
| else: | |
| return _json_loads(open(content, 'r').read()) | |
| @property | |
| def user_loggedin(self): | |
| """ | |
| Represents whether the user is currently logged in. | |
| Returns: | |
| bool: Whether the user is logged in with Flask-OIDC. | |
| .. versionadded:: 1.0 | |
| """ | |
| return g.oidc_id_token is not None | |
| def user_getfield(self, field, access_token=None): | |
| """ | |
| Request a single field of information about the user. | |
| :param field: The name of the field requested. | |
| :type field: str | |
| :returns: The value of the field. Depending on the type, this may be | |
| a string, list, dict, or something else. | |
| :rtype: object | |
| .. versionadded:: 1.0 | |
| """ | |
| info = self.user_getinfo([field], access_token) | |
| return info.get(field) | |
| def user_getinfo(self, fields, access_token=None): | |
| """ | |
| Request multiple fields of information about the user. | |
| :param fields: The names of the fields requested. | |
| :type fields: list | |
| :returns: The values of the current user for the fields requested. | |
| The keys are the field names, values are the values of the | |
| fields as indicated by the OpenID Provider. Note that fields | |
| that were not provided by the Provider are absent. | |
| :rtype: dict | |
| :raises Exception: If the user was not authenticated. Check this with | |
| user_loggedin. | |
| .. versionadded:: 1.0 | |
| """ | |
| if g.oidc_id_token is None and access_token is None: | |
| raise Exception('User was not authenticated') | |
| info = {} | |
| all_info = None | |
| for field in fields: | |
| if access_token is None and field in g.oidc_id_token: | |
| info[field] = g.oidc_id_token[field] | |
| elif current_app.config['OIDC_USER_INFO_ENABLED']: | |
| # This was not in the id_token. Let's get user information | |
| if all_info is None: | |
| all_info = self._retrieve_userinfo(access_token) | |
| if all_info is None: | |
| # To make sure we don't retry for every field | |
| all_info = {} | |
| if field in all_info: | |
| info[field] = all_info[field] | |
| else: | |
| # We didn't get this information | |
| pass | |
| return info | |
| def get_access_token(self): | |
| """Method to return the current requests' access_token. | |
| :returns: Access token or None | |
| :rtype: str | |
| .. versionadded:: 1.2 | |
| """ | |
| try: | |
| credentials = OAuth2Credentials.from_json( | |
| self.credentials_store[g.oidc_id_token['sub']]) | |
| return credentials.access_token | |
| except KeyError: | |
| logger.debug("Expired ID token, credentials missing", | |
| exc_info=True) | |
| return None | |
| def get_refresh_token(self): | |
| """Method to return the current requests' refresh_token. | |
| :returns: Access token or None | |
| :rtype: str | |
| .. versionadded:: 1.2 | |
| """ | |
| try: | |
| credentials = OAuth2Credentials.from_json( | |
| self.credentials_store[g.oidc_id_token['sub']]) | |
| return credentials.refresh_token | |
| except KeyError: | |
| logger.debug("Expired ID token, credentials missing", | |
| exc_info=True) | |
| return None | |
| def _retrieve_userinfo(self, access_token=None): | |
| """ | |
| Requests extra user information from the Provider's UserInfo and | |
| returns the result. | |
| :returns: The contents of the UserInfo endpoint. | |
| :rtype: dict | |
| """ | |
| if 'userinfo_uri' not in self.client_secrets: | |
| logger.debug('Userinfo uri not specified') | |
| raise AssertionError('UserInfo URI not specified') | |
| # Cache the info from this request | |
| if '_oidc_userinfo' in g: | |
| return g._oidc_userinfo | |
| http = httplib2.Http() | |
| if access_token is None: | |
| try: | |
| credentials = OAuth2Credentials.from_json( | |
| self.credentials_store[g.oidc_id_token['sub']]) | |
| except KeyError: | |
| logger.debug("Expired ID token, credentials missing", | |
| exc_info=True) | |
| return None | |
| credentials.authorize(http) | |
| resp, content = http.request(self.client_secrets['userinfo_uri']) | |
| else: | |
| # We have been manually overriden with an access token | |
| resp, content = http.request( | |
| self.client_secrets['userinfo_uri'], | |
| "POST", | |
| body=urlencode({"access_token": access_token}), | |
| headers={'Content-Type': 'application/x-www-form-urlencoded'}) | |
| logger.debug('Retrieved user info: %s' % content) | |
| info = _json_loads(content) | |
| g._oidc_userinfo = info | |
| return info | |
| def get_cookie_id_token(self): | |
| """ | |
| .. deprecated:: 1.0 | |
| Use :func:`user_getinfo` instead. | |
| """ | |
| warn('You are using a deprecated function (get_cookie_id_token). ' | |
| 'Please reconsider using this', DeprecationWarning) | |
| return self._get_cookie_id_token() | |
| def _get_cookie_id_token(self): | |
| try: | |
| id_token_cookie = request.cookies.get(current_app.config[ | |
| 'OIDC_ID_TOKEN_COOKIE_NAME']) | |
| if not id_token_cookie: | |
| # Do not error if we were unable to get the cookie. | |
| # The user can debug this themselves. | |
| return None | |
| return self.cookie_serializer.loads(id_token_cookie) | |
| except SignatureExpired: | |
| logger.debug("Invalid ID token cookie", exc_info=True) | |
| return None | |
| except BadSignature: | |
| logger.info("Signature invalid for ID token cookie", exc_info=True) | |
| return None | |
| def set_cookie_id_token(self, id_token): | |
| """ | |
| .. deprecated:: 1.0 | |
| """ | |
| warn('You are using a deprecated function (set_cookie_id_token). ' | |
| 'Please reconsider using this', DeprecationWarning) | |
| return self._set_cookie_id_token(id_token) | |
| def _set_cookie_id_token(self, id_token): | |
| """ | |
| Cooperates with @after_request to set a new ID token cookie. | |
| """ | |
| g.oidc_id_token = id_token | |
| g.oidc_id_token_dirty = True | |
| def _after_request(self, response): | |
| """ | |
| Set a new ID token cookie if the ID token has changed. | |
| """ | |
| # This means that if either the new or the old are False, we set | |
| # insecure cookies. | |
| # We don't define OIDC_ID_TOKEN_COOKIE_SECURE in init_app, because we | |
| # don't want people to find it easily. | |
| cookie_secure = (current_app.config['OIDC_COOKIE_SECURE'] and | |
| current_app.config.get('OIDC_ID_TOKEN_COOKIE_SECURE', | |
| True)) | |
| if getattr(g, 'oidc_id_token_dirty', False): | |
| if g.oidc_id_token: | |
| signed_id_token = self.cookie_serializer.dumps(g.oidc_id_token) | |
| response.set_cookie( | |
| current_app.config['OIDC_ID_TOKEN_COOKIE_NAME'], | |
| signed_id_token, | |
| secure=cookie_secure, | |
| httponly=True, | |
| max_age=current_app.config['OIDC_ID_TOKEN_COOKIE_TTL']) | |
| else: | |
| # This was a log out | |
| response.set_cookie( | |
| current_app.config['OIDC_ID_TOKEN_COOKIE_NAME'], | |
| '', | |
| path=current_app.config['OIDC_ID_TOKEN_COOKIE_PATH'], | |
| secure=cookie_secure, | |
| httponly=True, | |
| expires=0) | |
| return response | |
| def _before_request(self): | |
| g.oidc_id_token = None | |
| self.authenticate_or_redirect() | |
| def authenticate_or_redirect(self): | |
| """ | |
| Helper function suitable for @app.before_request and @check. | |
| Sets g.oidc_id_token to the ID token if the user has successfully | |
| authenticated, else returns a redirect object so they can go try | |
| to authenticate. | |
| :returns: A redirect object, or None if the user is logged in. | |
| :rtype: Redirect | |
| .. deprecated:: 1.0 | |
| Use :func:`require_login` instead. | |
| """ | |
| # the auth callback and error pages don't need user to be authenticated | |
| if request.endpoint in frozenset(['_oidc_callback', '_oidc_error']): | |
| return None | |
| # retrieve signed ID token cookie | |
| id_token = self._get_cookie_id_token() | |
| if id_token is None: | |
| return self.redirect_to_auth_server(request.url) | |
| # ID token expired | |
| # when Google is the IdP, this happens after one hour | |
| if time.time() >= id_token['exp']: | |
| # get credentials from store | |
| try: | |
| credentials = OAuth2Credentials.from_json( | |
| self.credentials_store[id_token['sub']]) | |
| except KeyError: | |
| logger.debug("Expired ID token, credentials missing", | |
| exc_info=True) | |
| return self.redirect_to_auth_server(request.url) | |
| # refresh and store credentials | |
| try: | |
| credentials.refresh(httplib2.Http()) | |
| if credentials.id_token: | |
| id_token = credentials.id_token | |
| else: | |
| # It is not guaranteed that we will get a new ID Token on | |
| # refresh, so if we do not, let's just update the id token | |
| # expiry field and reuse the existing ID Token. | |
| if credentials.token_expiry is None: | |
| logger.debug('Expired ID token, no new expiry. Falling' | |
| ' back to assuming 1 hour') | |
| id_token['exp'] = time.time() + 3600 | |
| else: | |
| id_token['exp'] = calendar.timegm( | |
| credentials.token_expiry.timetuple()) | |
| self.credentials_store[id_token['sub']] = credentials.to_json() | |
| self._set_cookie_id_token(id_token) | |
| except AccessTokenRefreshError: | |
| # Can't refresh. Wipe credentials and redirect user to IdP | |
| # for re-authentication. | |
| logger.debug("Expired ID token, can't refresh credentials", | |
| exc_info=True) | |
| del self.credentials_store[id_token['sub']] | |
| return self.redirect_to_auth_server(request.url) | |
| # make ID token available to views | |
| g.oidc_id_token = id_token | |
| return None | |
| def require_login(self, view_func): | |
| """ | |
| Use this to decorate view functions that require a user to be logged | |
| in. If the user is not already logged in, they will be sent to the | |
| Provider to log in, after which they will be returned. | |
| .. versionadded:: 1.0 | |
| This was :func:`check` before. | |
| """ | |
| @wraps(view_func) | |
| def decorated(*args, **kwargs): | |
| if g.oidc_id_token is None: | |
| return self.redirect_to_auth_server(request.url) | |
| return view_func(*args, **kwargs) | |
| return decorated | |
| # Backwards compatibility | |
| check = require_login | |
| """ | |
| .. deprecated:: 1.0 | |
| Use :func:`require_login` instead. | |
| """ | |
| def require_keycloak_role(self, client, role): | |
| """ | |
| Function to check for a KeyCloak client role in JWT access token. | |
| This is intended to be replaced with a more generic 'require this value | |
| in token or claims' system, at which point backwards compatibility will | |
| be added. | |
| .. versionadded:: 1.5.0 | |
| """ | |
| def wrapper(view_func): | |
| @wraps(view_func) | |
| def decorated(*args, **kwargs): | |
| pre, tkn, post = self.get_access_token().split('.') | |
| access_token = json.loads(b64decode(tkn)) | |
| if role in access_token['resource_access'][client]['roles']: | |
| return view_func(*args, **kwargs) | |
| else: | |
| return abort(403) | |
| return decorated | |
| return wrapper | |
| def flow_for_request(self): | |
| """ | |
| .. deprecated:: 1.0 | |
| Use :func:`require_login` instead. | |
| """ | |
| warn('You are using a deprecated function (flow_for_request). ' | |
| 'Please reconsider using this', DeprecationWarning) | |
| return self._flow_for_request() | |
| def _flow_for_request(self): | |
| """ | |
| Build a flow with the correct absolute callback URL for this request. | |
| :return: | |
| """ | |
| flow = copy(self.flow) | |
| redirect_uri = current_app.config['OVERWRITE_REDIRECT_URI'] | |
| if not redirect_uri: | |
| flow.redirect_uri = url_for('_oidc_callback', _external=True) | |
| else: | |
| flow.redirect_uri = redirect_uri | |
| return flow | |
| def redirect_to_auth_server(self, destination=None, customstate=None): | |
| """ | |
| Set a CSRF token in the session, and redirect to the IdP. | |
| :param destination: The page that the user was going to, | |
| before we noticed they weren't logged in. | |
| :type destination: Url to return the client to if a custom handler is | |
| not used. Not available with custom callback. | |
| :param customstate: The custom data passed via the ODIC state. | |
| Note that this only works with a custom_callback, and this will | |
| ignore destination. | |
| :type customstate: Anything that can be serialized | |
| :returns: A redirect response to start the login process. | |
| :rtype: Flask Response | |
| .. deprecated:: 1.0 | |
| Use :func:`require_login` instead. | |
| """ | |
| if not self._custom_callback and customstate: | |
| raise ValueError('Custom State is only avilable with a custom ' | |
| 'handler') | |
| if 'oidc_csrf_token' not in session: | |
| csrf_token = urlsafe_b64encode(os.urandom(24)).decode('utf-8') | |
| session['oidc_csrf_token'] = csrf_token | |
| state = { | |
| 'csrf_token': session['oidc_csrf_token'], | |
| } | |
| statefield = 'destination' | |
| statevalue = destination | |
| if customstate is not None: | |
| statefield = 'custom' | |
| statevalue = customstate | |
| state[statefield] = self.extra_data_serializer.dumps( | |
| statevalue).decode('utf-8') | |
| extra_params = { | |
| 'state': urlsafe_b64encode(json.dumps(state).encode('utf-8')), | |
| } | |
| extra_params.update(current_app.config['OIDC_EXTRA_REQUEST_AUTH_PARAMS']) | |
| if current_app.config['OIDC_GOOGLE_APPS_DOMAIN']: | |
| extra_params['hd'] = current_app.config['OIDC_GOOGLE_APPS_DOMAIN'] | |
| if current_app.config['OIDC_OPENID_REALM']: | |
| extra_params['openid.realm'] = current_app.config[ | |
| 'OIDC_OPENID_REALM'] | |
| flow = self._flow_for_request() | |
| auth_url = '{url}&{extra_params}'.format( | |
| url=flow.step1_get_authorize_url(), | |
| extra_params=urlencode(extra_params)) | |
| # if the user has an ID token, it's invalid, or we wouldn't be here | |
| self._set_cookie_id_token(None) | |
| return redirect(auth_url) | |
| def _is_id_token_valid(self, id_token): | |
| """ | |
| Check if `id_token` is a current ID token for this application, | |
| was issued by the Apps domain we expected, | |
| and that the email address has been verified. | |
| @see: http://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation | |
| """ | |
| if not id_token: | |
| return False | |
| # step 2: check issuer | |
| if id_token['iss'] not in current_app.config['OIDC_VALID_ISSUERS']: | |
| logger.error('id_token issued by non-trusted issuer: %s' | |
| % id_token['iss']) | |
| return False | |
| if isinstance(id_token['aud'], list): | |
| # step 3 for audience list | |
| if self.flow.client_id not in id_token['aud']: | |
| logger.error('We are not a valid audience') | |
| return False | |
| # step 4 | |
| if 'azp' not in id_token and len(id_token['aud']) > 1: | |
| logger.error('Multiple audiences and not authorized party') | |
| return False | |
| else: | |
| # step 3 for single audience | |
| if id_token['aud'] != self.flow.client_id: | |
| logger.error('We are not the audience') | |
| return False | |
| # step 5 | |
| if 'azp' in id_token and id_token['azp'] != self.flow.client_id: | |
| logger.error('Authorized Party is not us') | |
| return False | |
| # step 6-8: TLS checked | |
| # step 9: check exp | |
| if int(time.time()) >= int(id_token['exp']): | |
| logger.error('Token has expired') | |
| return False | |
| # step 10: check iat | |
| if id_token['iat'] < (time.time() - | |
| current_app.config['OIDC_CLOCK_SKEW']): | |
| logger.error('Token issued in the past') | |
| return False | |
| # (not required if using HTTPS?) step 11: check nonce | |
| # step 12-13: not requested acr or auth_time, so not needed to test | |
| # additional steps specific to our usage | |
| if current_app.config['OIDC_GOOGLE_APPS_DOMAIN'] and \ | |
| id_token.get('hd') != current_app.config[ | |
| 'OIDC_GOOGLE_APPS_DOMAIN']: | |
| logger.error('Invalid google apps domain') | |
| return False | |
| if not id_token.get('email_verified', False) and \ | |
| current_app.config['OIDC_REQUIRE_VERIFIED_EMAIL']: | |
| logger.error('Email not verified') | |
| return False | |
| return True | |
| WRONG_GOOGLE_APPS_DOMAIN = 'WRONG_GOOGLE_APPS_DOMAIN' | |
| def custom_callback(self, view_func): | |
| """ | |
| Wrapper function to use a custom callback. | |
| The custom OIDC callback will get the custom state field passed in with | |
| redirect_to_auth_server. | |
| """ | |
| @wraps(view_func) | |
| def decorated(*args, **kwargs): | |
| plainreturn, data = self._process_callback('custom') | |
| if plainreturn: | |
| return data | |
| else: | |
| return view_func(data, *args, **kwargs) | |
| self._custom_callback = decorated | |
| return decorated | |
| def _oidc_callback(self): | |
| plainreturn, data = self._process_callback('destination') | |
| if plainreturn: | |
| return data | |
| else: | |
| return redirect(data) | |
| def _process_callback(self, statefield): | |
| """ | |
| Exchange the auth code for actual credentials, | |
| then redirect to the originally requested page. | |
| """ | |
| # retrieve session and callback variables | |
| try: | |
| session_csrf_token = session.get('oidc_csrf_token') | |
| state = _json_loads(urlsafe_b64decode(request.args['state'].encode('utf-8'))) | |
| csrf_token = state['csrf_token'] | |
| code = request.args['code'] | |
| except (KeyError, ValueError): | |
| logger.debug("Can't retrieve CSRF token, state, or code", | |
| exc_info=True) | |
| return True, self._oidc_error() | |
| # check callback CSRF token passed to IdP | |
| # against session CSRF token held by user | |
| if csrf_token != session_csrf_token: | |
| logger.debug("CSRF token mismatch") | |
| return True, self._oidc_error() | |
| # make a request to IdP to exchange the auth code for OAuth credentials | |
| flow = self._flow_for_request() | |
| credentials = flow.step2_exchange(code) | |
| id_token = credentials.id_token | |
| if not self._is_id_token_valid(id_token): | |
| logger.debug("Invalid ID token") | |
| if id_token.get('hd') != current_app.config[ | |
| 'OIDC_GOOGLE_APPS_DOMAIN']: | |
| return True, self._oidc_error( | |
| "You must log in with an account from the {0} domain." | |
| .format(current_app.config['OIDC_GOOGLE_APPS_DOMAIN']), | |
| self.WRONG_GOOGLE_APPS_DOMAIN) | |
| return True, self._oidc_error() | |
| # store credentials by subject | |
| # when Google is the IdP, the subject is their G+ account number | |
| self.credentials_store[id_token['sub']] = credentials.to_json() | |
| # Retrieve the extra statefield data | |
| try: | |
| response = self.extra_data_serializer.loads(state[statefield]) | |
| except BadSignature: | |
| logger.error('State field was invalid') | |
| return True, self._oidc_error() | |
| # set a persistent signed cookie containing the ID token | |
| # and redirect to the final destination | |
| self._set_cookie_id_token(id_token) | |
| return False, response | |
| def _oidc_error(self, message='Not Authorized', code=None): | |
| return (message, 401, { | |
| 'Content-Type': 'text/plain', | |
| }) | |
| def logout(self): | |
| """ | |
| Request the browser to please forget the cookie we set, to clear the | |
| current session. | |
| Note that as described in [1], this will not log out in the case of a | |
| browser that doesn't clear cookies when requested to, and the user | |
| could be automatically logged in when they hit any authenticated | |
| endpoint. | |
| [1]: https://github.com/puiterwijk/flask-oidc/issues/5#issuecomment-86187023 | |
| .. versionadded:: 1.0 | |
| """ | |
| # TODO: Add single logout | |
| self._set_cookie_id_token(None) | |
| # Below here is for resource servers to validate tokens | |
| def validate_token(self, token, scopes_required=None): | |
| """ | |
| This function can be used to validate tokens. | |
| Note that this only works if a token introspection url is configured, | |
| as that URL will be queried for the validity and scopes of a token. | |
| :param scopes_required: List of scopes that are required to be | |
| granted by the token before returning True. | |
| :type scopes_required: list | |
| :returns: True if the token was valid and contained the required | |
| scopes. An ErrStr (subclass of string for which bool() is False) if | |
| an error occured. | |
| :rtype: Boolean or String | |
| .. versionadded:: 1.1 | |
| """ | |
| valid = self._validate_token(token, scopes_required) | |
| if valid is True: | |
| return True | |
| else: | |
| return ErrStr(valid) | |
| def _validate_token(self, token, scopes_required=None): | |
| """The actual implementation of validate_token.""" | |
| if scopes_required is None: | |
| scopes_required = [] | |
| scopes_required = set(scopes_required) | |
| token_info = None | |
| valid_token = False | |
| has_required_scopes = False | |
| if token: | |
| try: | |
| token_info = self._get_token_info(token) | |
| except Exception as ex: | |
| token_info = {'active': False} | |
| logger.error('ERROR: Unable to get token info') | |
| logger.error(str(ex)) | |
| valid_token = token_info.get('active', False) | |
| if 'aud' in token_info and \ | |
| current_app.config['OIDC_RESOURCE_CHECK_AUD']: | |
| valid_audience = False | |
| aud = token_info['aud'] | |
| clid = self.client_secrets['client_id'] | |
| if isinstance(aud, list): | |
| valid_audience = clid in aud | |
| else: | |
| valid_audience = clid == aud | |
| if not valid_audience: | |
| logger.error('Refused token because of invalid ' | |
| 'audience') | |
| valid_token = False | |
| if valid_token: | |
| token_scopes = token_info.get('scope', '').split(' ') | |
| else: | |
| token_scopes = [] | |
| has_required_scopes = scopes_required.issubset( | |
| set(token_scopes)) | |
| if not has_required_scopes: | |
| logger.debug('Token missed required scopes') | |
| if (valid_token and has_required_scopes): | |
| g.oidc_token_info = token_info | |
| return True | |
| if not valid_token: | |
| return 'Token required but invalid' | |
| elif not has_required_scopes: | |
| return 'Token does not have required scopes' | |
| else: | |
| return 'Something went wrong checking your token' | |
| def accept_token(self, require_token=False, scopes_required=None, | |
| render_errors=True): | |
| """ | |
| Use this to decorate view functions that should accept OAuth2 tokens, | |
| this will most likely apply to API functions. | |
| Tokens are accepted as part of the query URL (access_token value) or | |
| a POST form value (access_token). | |
| Note that this only works if a token introspection url is configured, | |
| as that URL will be queried for the validity and scopes of a token. | |
| :param require_token: Whether a token is required for the current | |
| function. If this is True, we will abort the request if there | |
| was no token provided. | |
| :type require_token: bool | |
| :param scopes_required: List of scopes that are required to be | |
| granted by the token before being allowed to call the protected | |
| function. | |
| :type scopes_required: list | |
| :param render_errors: Whether or not to eagerly render error objects | |
| as JSON API responses. Set to False to pass the error object back | |
| unmodified for later rendering. | |
| :type render_errors: callback(obj) or None | |
| .. versionadded:: 1.0 | |
| """ | |
| def wrapper(view_func): | |
| @wraps(view_func) | |
| def decorated(*args, **kwargs): | |
| token = None | |
| if 'Authorization' in request.headers and request.headers['Authorization'].startswith('Bearer '): | |
| token = request.headers['Authorization'].split(None,1)[1].strip() | |
| if 'access_token' in request.form: | |
| token = request.form['access_token'] | |
| elif 'access_token' in request.args: | |
| token = request.args['access_token'] | |
| validity = self.validate_token(token, scopes_required) | |
| if (validity is True) or (not require_token): | |
| return view_func(*args, **kwargs) | |
| else: | |
| response_body = {'error': 'invalid_token', | |
| 'error_description': validity} | |
| if render_errors: | |
| response_body = json.dumps(response_body) | |
| return response_body, 401, {'WWW-Authenticate': 'Bearer'} | |
| return decorated | |
| return wrapper | |
| def _get_token_info(self, token): | |
| # We hardcode to use client_secret_post, because that's what the Google | |
| # oauth2client library defaults to | |
| request = {'token': token} | |
| headers = {'Content-type': 'application/x-www-form-urlencoded'} | |
| hint = current_app.config['OIDC_TOKEN_TYPE_HINT'] | |
| if hint != 'none': | |
| request['token_type_hint'] = hint | |
| auth_method = current_app.config['OIDC_INTROSPECTION_AUTH_METHOD'] | |
| if (auth_method == 'client_secret_basic'): | |
| basic_auth_string = '%s:%s' % (self.client_secrets['client_id'], self.client_secrets['client_secret']) | |
| basic_auth_bytes = bytearray(basic_auth_string, 'utf-8') | |
| headers['Authorization'] = 'Basic %s' % b64encode(basic_auth_bytes).decode('utf-8') | |
| elif (auth_method == 'bearer'): | |
| headers['Authorization'] = 'Bearer %s' % token | |
| elif (auth_method == 'client_secret_post'): | |
| request['client_id'] = self.client_secrets['client_id'] | |
| if self.client_secrets['client_secret'] is not None: | |
| request['client_secret'] = self.client_secrets['client_secret'] | |
| resp, content = httplib2.Http().request( | |
| self.client_secrets['token_introspection_uri'], 'POST', | |
| urlencode(request), headers=headers) | |
| # TODO: Cache this reply | |
| return _json_loads(content) |