592 lines
26 KiB
Python
592 lines
26 KiB
Python
# authentic2-auth-fc - authentic2 authentication for FranceConnect
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# Copyright (C) 2019 Entr'ouvert
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import uuid
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import logging
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import json
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import urlparse
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import requests
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from requests_oauthlib import OAuth2Session
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import django
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from django.views.generic import View, FormView
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from django.http import HttpResponseRedirect, Http404
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from django.contrib.auth import authenticate, REDIRECT_FIELD_NAME, get_user_model
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from django.contrib import messages
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from django.shortcuts import resolve_url, render
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from django.utils.translation import ugettext as _
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from django.utils.http import is_safe_url, urlencode
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from django.conf import settings
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from django.core import signing
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from django.core.cache import InvalidCacheBackendError, caches
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from django.core.exceptions import PermissionDenied
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from django.core.urlresolvers import reverse
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from django.forms import Form
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try:
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from django.contrib.auth.views import update_session_auth_hash
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except ImportError:
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update_session_auth_hash = None
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from authentic2 import app_settings as a2_app_settings
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from authentic2 import utils as a2_utils, hooks, constants
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from authentic2.a2_rbac.utils import get_default_ou
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from . import app_settings, models, utils
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SET_PASSWORD_FORM_CLASS = a2_utils.import_module_or_class(
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a2_app_settings.A2_REGISTRATION_SET_PASSWORD_FORM_CLASS)
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class LoggerMixin(object):
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def __init__(self, *args, **kwargs):
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self.logger = logging.getLogger(__name__)
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super(LoggerMixin, *args, **kwargs)
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try:
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cache = caches['fc']
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except InvalidCacheBackendError:
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cache = caches['default']
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CACHE_TIMEOUT = 60
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def ask_authorization(request, scopes, logger):
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'''Compute an authorize URL for obtaining the given scope'''
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if not isinstance(scopes, (list, tuple)):
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scopes = [scopes]
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redirect_uri = request.build_absolute_uri()
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state = unicode(uuid.uuid4())
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states = request.session.setdefault('fc_states', {})
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states[state] = {
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'redirect_uri': redirect_uri,
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}
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request.session.modified = True
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params = {
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'client_id': app_settings.client_id,
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'scope': ' '.join(scopes),
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'redirect_uri': redirect_uri,
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'response_type': 'code',
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'state': state,
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'nonce': state,
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}
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logger.debug('query string %s', params)
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url = '{0}?{1}'.format(app_settings.authorize_url, urlencode(params))
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logger.debug('redirect to %s', url)
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response = HttpResponseRedirect(url)
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response.display_message = False
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return response
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def resolve_access_token(authorization_code, redirect_uri, logger):
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'''Exchange an authorization_code for an access_token'''
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data = {
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'code': authorization_code,
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'client_id': app_settings.client_id,
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'client_secret': app_settings.client_secret,
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'redirect_uri': redirect_uri,
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'grant_type': 'authorization_code',
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}
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logger.debug('access token request %s', data)
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try:
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session = utils.requests_retry_session()
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response = session.post(
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app_settings.token_url, data=data,
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verify=app_settings.verify_certificate,
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allow_redirects=False, timeout=3)
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if response.status_code != 200:
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try:
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data = response.json()
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logger.warning(u'oauth2 error on access token retrieval: %r', data)
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except ValueError:
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data = {}
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logger.warning(u'oauth2 error on access token retrieval: %r', response.content)
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return
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except requests.exceptions.RequestException as e:
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logger.warning(u'unable to retrieve access token {}'.format(e))
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else:
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try:
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response = response.json()
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logger.debug('token resolved : {}'.format(response))
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return response
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except ValueError:
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logger.warning(
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"no JSON object can be decoded from the data received from {} : '{}'".format(
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app_settings.token_url, response.content))
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def access_token_from_request(request, logger):
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'''Resolve an access token given a request returning from the authorization
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endpoint.
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'''
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code = request.GET.get('code')
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state = request.GET.get('state')
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if not code:
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return
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if not state:
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return
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states = request.session.get('fc_states', {})
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if state not in states:
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return
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# there should not be many FC SSO in flight
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redirect_uri = states[state]['redirect_uri']
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return resolve_access_token(code, redirect_uri, logger)
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ACCESS_GRANT_CODE = 'accessgrantcode'
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class FcOAuthSessionViewMixin(LoggerMixin):
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'''Add the OAuth2 dance to a view'''
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scopes = ['openid', 'profile', 'birth', 'email']
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redirect_field_name = REDIRECT_FIELD_NAME
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in_popup = False
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token = None
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def get_in_popup(self):
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return self.in_popup
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def redirect_to(self, request):
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if request.method == 'POST':
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redirect_to = request.POST.get(self.redirect_field_name,
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request.GET.get(self.redirect_field_name, ''))
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else:
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redirect_to = request.GET.get(self.redirect_field_name, '')
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if django.VERSION < (1, 11):
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safe = is_safe_url(url=redirect_to, host=request.get_host())
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else:
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safe = is_safe_url(url=redirect_to, allowed_hosts=[request.get_host()])
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if not safe:
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redirect_to = resolve_url(settings.LOGIN_REDIRECT_URL)
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return redirect_to
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def close_popup_redirect(self, request, next_url, *args, **kwargs):
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'''Show a page to close the current popup and reload the parent window
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with the return url.
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'''
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return render(request, 'authentic2_auth_fc/close-popup-redirect.html',
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{'redirect_to': next_url})
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def simple_redirect(self, request, next_url, *args, **kwargs):
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return a2_utils.redirect(request, next_url, *args, **kwargs)
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def redirect(self, request, *args, **kwargs):
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next_url = kwargs.pop('next_url', None)
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if next_url is None:
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next_url = self.redirect_to(request, *args, **kwargs)
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if self.get_in_popup():
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return self.close_popup_redirect(request, next_url, *args,
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**kwargs)
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else:
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return self.simple_redirect(request, next_url, *args, **kwargs)
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def redirect_and_come_back(self, request, next_url, *args, **kwargs):
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old_next_url = self.redirect_to(request)
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here = a2_utils.make_url(request.path, params={REDIRECT_FIELD_NAME: old_next_url})
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here = a2_utils.make_url(here, **kwargs)
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there = a2_utils.make_url(next_url, params={REDIRECT_FIELD_NAME: here})
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return self.redirect(request, next_url=there, *args, **kwargs)
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def get_scopes(self):
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if app_settings.scopes:
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return list(set(['openid'] + app_settings.scopes))
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else:
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return self.scopes
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def get_ressource(self, url, verify):
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try:
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data = self.oauth_session().get(url, verify=verify, allow_redirects=False, timeout=3)
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data.raise_for_status()
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except requests.exceptions.RequestException as e:
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self.logger.warning(u'unable to retrieve ressource from {} due to {}'.format(url, e))
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else:
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try:
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data = data.json()
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self.logger.debug('ressource resolved : {}'.format(data))
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return data
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except ValueError:
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self.logger.warning(
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"no JSON object can be decoded from the data received from {} : '{}'".format(
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url, data.content))
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def get_user_info(self):
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return self.get_ressource(app_settings.userinfo_url + '?schema=openid',
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app_settings.verify_certificate)
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def get_data(self, scopes=[]):
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data = dict()
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if not app_settings.fd_list:
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return data
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for scope in scopes:
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for fd in app_settings.fd_list[scope]:
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url = fd['url']
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if fd['query_dic']:
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url += '?' + urlencode(fd['query_dic'])
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d = self.get_ressource(url, app_settings.verify_certificate)
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if d:
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data.setdefault(scope, []).append((fd['name'], d))
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return data
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def authorization_error(self, request, *args, **kwargs):
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if request.method == 'POST':
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error = request.POST.get('error')
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else:
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error = request.GET.get('error')
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if error == 'access_denied':
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messages.warning(request, _('You refused the connection.'))
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self.logger.debug('authorization_error %r', request.GET)
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return self.redirect(request)
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def dispatch(self, request, *args, **kwargs):
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'''Interpret the OAuth authorization dance'''
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if 'code' in request.GET:
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self.token = access_token_from_request(request, self.logger)
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# Token request may not be completly processed and result in no
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# token
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if not self.token:
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messages.warning(request, _('Unable to connect to FranceConnect.'))
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return self.redirect(request)
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# The token request may fail, 'error' is then required.
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# A bad client secret results in error equals to invalid_request
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# for FC and invalid_client for oidc_provider.
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if 'error' in self.token:
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msg = 'token request failed : {}'.format(self.token)
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self.logger.warning(msg)
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messages.warning(request, _('Unable to connect to FranceConnect.'))
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return self.redirect(request)
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key = app_settings.client_secret
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if isinstance(key, unicode):
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key = key.encode('utf-8')
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self.id_token, error = models.parse_id_token(
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self.token['id_token'], client_id=app_settings.client_id, client_secret=key)
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if not self.id_token:
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self.logger.warning(u'validation of id_token failed: %s', error)
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messages.warning(request, _('Unable to connect to FranceConnect.'))
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return self.redirect(request)
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nonce = self.id_token.get('nonce')
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states = request.session.get('fc_states', {})
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if not nonce or nonce not in states:
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self.logger.warning(u'invalid nonce in id_token %s, known ones %s', nonce,
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u', '.join(states.keys()))
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messages.warning(request, _('Unable to connect to FranceConnect.'))
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return self.redirect(request)
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self.logger.debug('fc id_token %s', self.id_token)
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for key in self.id_token:
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setattr(self, key, self.id_token[key])
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self.oauth_session = lambda: utils.requests_retry_session(
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session=OAuth2Session(
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app_settings.client_id, token=self.token))
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self.user_info = self.get_user_info()
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if not self.user_info:
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msg = 'userinfo resolution failed : {}'.format(self.token)
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self.logger.warning(msg)
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messages.warning(request, _('Unable to connect to FranceConnect.'))
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return self.redirect(request)
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self.logger.debug('fc user_info %s', self.user_info)
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self.request.session['fc_id_token'] = self.id_token
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self.request.session['fc_id_token_raw'] = self.token['id_token']
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self.request.session['fc_user_info'] = self.user_info
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if 'fd_scopes' in request.GET:
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scopes = request.GET.get('fd_scopes')
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scopes = scopes.split()
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self.data = self.get_data(scopes)
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self.logger.debug('fc data %s', self.data)
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fc_data = self.request.session.setdefault('fc_data', {})
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for scope in self.data:
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fc_data.setdefault(scope, []).extend(self.data[scope])
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self.logger.debug('fc data in session %s', self.request.session['fc_data'])
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return super(FcOAuthSessionViewMixin, self).dispatch(request,
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*args,
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**kwargs)
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elif 'error' in request.GET:
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return self.authorization_error(request, *args, **kwargs)
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else:
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if 'fd_scopes' in request.GET:
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scopes = request.GET.get('fd_scopes')
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scopes = scopes.split()
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self.scopes.extend(scopes)
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return ask_authorization(request, self.get_scopes(), self.logger)
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class PopupViewMixin(object):
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def get_in_popup(self):
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return 'popup' in self.request.GET
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class LoginOrLinkView(PopupViewMixin, FcOAuthSessionViewMixin, View):
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'''Login with FC, if the FC account is already linked, connect this user,
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if a user is logged link the user to this account, otherwise display an
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error message.
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'''
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def update_user_info(self):
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self.fc_account.user_info = json.dumps(self.user_info)
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self.fc_account.save()
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utils.apply_user_info_mappings(self.fc_account.user, self.user_info)
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self.logger.debug('updating user_info %s', self.fc_account.user_info)
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def get(self, request, *args, **kwargs):
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registration = True if 'registration' in request.GET else False
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'''Request an access grant code and associate it to the current user'''
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self.service_slug = request.GET.get(constants.SERVICE_FIELD_NAME)
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if request.user.is_authenticated():
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# Prevent to add a link with an FC account already linked with another user.
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try:
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fc_account = models.FcAccount.objects.get(sub=self.sub, user__is_active=True)
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if fc_account.user is not request.user:
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msg = 'Attempt to link FC account {} already linked with user {}'
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self.logger.info(msg.format(self.sub, fc_account.user))
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messages.error(request,
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_('The FranceConnect account {} is already'
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' linked with another account.').format(fc_account))
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return self.redirect(request)
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except models.FcAccount.DoesNotExist:
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pass
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# Prevent to add a link to an user which is already linked to an FC account
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if request.user.fc_accounts.exists():
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self.logger.warning(u'cannot link to sub %s, account is already linked to an '
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u'FC account', self.sub)
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messages.error(request,
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_('Your account is already linked to a FranceConnect account'))
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return self.redirect(request)
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json_token = json.dumps(self.token)
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self.fc_account, created = models.FcAccount.objects.get_or_create(
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defaults={'token': json_token},
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sub=self.sub, user=request.user)
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if created:
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self.logger.info('fc link created sub %s', self.sub)
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self.update_user_info()
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data = utils.get_mapped_attributes_flat(request)
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if 'email' in data:
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messages.info(request,
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_('Your FranceConnect account {} with '
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'email {} has been linked.').format(self.fc_account,
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data['email']))
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else:
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messages.info(request, _('Your FranceConnect account {} '
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'has been linked.').format(self.fc_account))
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hooks.call_hooks('event', name='fc-link', user=request.user, sub=self.sub,
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request=request)
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else:
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self.fc_account.token = json_token
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self.fc_account.save()
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self.update_user_info()
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messages.info(request, _('Your local account has been updated.'))
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return self.redirect(request)
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default_ou = get_default_ou()
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email_is_unique = a2_app_settings.A2_EMAIL_IS_UNIQUE or default_ou.email_is_unique
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user = authenticate(sub=self.sub, user_info=self.user_info,
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token=self.token)
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if not user and self.user_info.get('email') and email_is_unique:
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email = self.user_info['email']
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User = get_user_model()
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qs = User.objects.filter(email__iexact=email)
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if not a2_app_settings.A2_EMAIL_IS_UNIQUE and default_ou.email_is_unique:
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qs = qs.filter(ou=default_ou)
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if qs.exists():
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# there should not be multiple accounts with the same mail
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if len(qs) > 1:
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self.logger.error(u'multiple accounts with the same mail %s, %s', email,
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list(qs))
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# ok we have one account
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elif len(qs) == 1:
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user = qs[0]
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# but does he have already a link to an FC account ?
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if not user.fc_accounts.exists():
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fc_account, created = models.FcAccount.objects.get_or_create(
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defaults={'token': json.dumps(self.token)},
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sub=self.sub, user=user)
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if created:
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self.logger.info(u'fc link created sub %s user %s', self.sub, user)
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hooks.call_hooks('event', name='fc-link', user=user, sub=self.sub,
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request=request)
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user = authenticate(sub=self.sub, user_info=self.user_info,
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token=self.token)
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else:
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messages.warning(
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request,
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_('Your FranceConnect email address \'%s\' is already used by another '
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'account, so we cannot create an account for you. Please create an '
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'account with another email address then link it to FranceConnect '
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'using your account management page.') % email)
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return self.redirect(request)
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if user:
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a2_utils.login(request, user, 'france-connect', service_slug=self.service_slug)
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self.fc_account = models.FcAccount.objects.get(sub=self.sub, user=user)
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self.fc_account.token = json.dumps(self.token)
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self.fc_account.save(update_fields=['token'])
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self.update_user_info()
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self.logger.info('logged in using fc sub %s', self.sub)
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return self.redirect(request)
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else:
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params = {}
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if self.service_slug:
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params[constants.SERVICE_FIELD_NAME] = self.service_slug
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if registration:
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return self.redirect_and_come_back(request,
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a2_utils.make_url('fc-registration',
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params=params),
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params=params)
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else:
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messages.info(request, _('If you already have an account, please log in, else '
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'create your account.'))
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login_params = params.copy()
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if not app_settings.show_button_quick_account_creation:
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login_params['nofc'] = 1
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login_url = a2_utils.make_url(settings.LOGIN_URL, params=login_params)
|
|
return self.redirect_and_come_back(request, login_url, params=params)
|
|
|
|
|
|
class RegistrationView(PopupViewMixin, LoggerMixin, View):
|
|
def get(self, request, *args, **kwargs):
|
|
data = utils.get_mapped_attributes_flat(request)
|
|
data['no_password'] = True
|
|
if app_settings.auto_register:
|
|
data['confirm_data'] = 'required'
|
|
else:
|
|
data['confirm_data'] = True
|
|
redirect_to = request.GET.get(REDIRECT_FIELD_NAME, '')
|
|
if not is_safe_url(url=redirect_to, host=request.get_host()):
|
|
redirect_to = resolve_url(settings.LOGIN_REDIRECT_URL)
|
|
|
|
# Prevent errors when redirect_to does not contain fc-login-or-link view
|
|
parsed_redirect_to = urlparse.urlparse(redirect_to)
|
|
if parsed_redirect_to.path == reverse('fc-login-or-link'):
|
|
redirect_to = urlparse.parse_qs(parsed_redirect_to.query) \
|
|
.get(REDIRECT_FIELD_NAME, [a2_utils.make_url('auth_homepage')])[0]
|
|
params = {
|
|
REDIRECT_FIELD_NAME: redirect_to,
|
|
}
|
|
if constants.SERVICE_FIELD_NAME in request.GET:
|
|
params[constants.SERVICE_FIELD_NAME] = request.GET[constants.SERVICE_FIELD_NAME]
|
|
if self.get_in_popup():
|
|
params['popup'] = ''
|
|
redirect_to = a2_utils.make_url('fc-login-or-link', params=params)
|
|
if 'email' not in data:
|
|
data[REDIRECT_FIELD_NAME] = redirect_to
|
|
messages.warning(request,
|
|
_("FranceConnect didn't provide your email address, please do."))
|
|
return HttpResponseRedirect("{}?token={}".format(reverse('registration_register'),
|
|
signing.dumps(data)))
|
|
data['valid_email'] = False
|
|
data['franceconnect'] = True
|
|
data['authentication_method'] = 'france-connect'
|
|
if constants.SERVICE_FIELD_NAME in request.GET:
|
|
data[constants.SERVICE_FIELD_NAME] = request.GET[constants.SERVICE_FIELD_NAME]
|
|
activation_url = a2_utils.build_activation_url(request,
|
|
next_url=redirect_to,
|
|
**data)
|
|
return HttpResponseRedirect(activation_url)
|
|
|
|
|
|
class UnlinkView(LoggerMixin, FormView):
|
|
template_name = 'authentic2_auth_fc/unlink.html'
|
|
|
|
def get_success_url(self):
|
|
url = reverse('account_management')
|
|
if app_settings.logout_when_unlink:
|
|
# logout URL can be None if not session exists with FC
|
|
url = utils.build_logout_url(self.request, next_url=url) or url
|
|
return url
|
|
|
|
def get_form_class(self):
|
|
form_class = Form
|
|
if self.must_set_password():
|
|
form_class = SET_PASSWORD_FORM_CLASS
|
|
return form_class
|
|
|
|
def get_form_kwargs(self, **kwargs):
|
|
kwargs = super(UnlinkView, self).get_form_kwargs(**kwargs)
|
|
if self.must_set_password():
|
|
kwargs['user'] = self.request.user
|
|
return kwargs
|
|
|
|
def must_set_password(self):
|
|
for event in self.request.session.get(constants.AUTHENTICATION_EVENTS_SESSION_KEY, []):
|
|
if event['how'].startswith('password'):
|
|
return False
|
|
return True
|
|
|
|
def dispatch(self, request, *args, **kwargs):
|
|
if not request.user.is_authenticated():
|
|
raise PermissionDenied()
|
|
# We prevent unlinking if the user has no usable password and can't change it
|
|
# because we assume that the password is the unique other mean of authentication
|
|
# and unlinking would make the account unreachable.
|
|
if self.must_set_password() and not a2_app_settings.A2_REGISTRATION_CAN_CHANGE_PASSWORD:
|
|
# Prevent access to the view.
|
|
raise Http404
|
|
return super(UnlinkView, self).dispatch(request, *args, **kwargs)
|
|
|
|
def form_valid(self, form):
|
|
if self.must_set_password():
|
|
form.save()
|
|
update_session_auth_hash(self.request, self.request.user)
|
|
self.logger.info(u'user %s has set a password', self.request.user)
|
|
links = models.FcAccount.objects.filter(user=self.request.user)
|
|
for link in links:
|
|
self.logger.info(u'user %s unlinked from %s', self.request.user, link)
|
|
hooks.call_hooks('event', name='fc-unlink', user=self.request.user)
|
|
messages.info(self.request, _('The link with the FranceConnect account has been deleted.'))
|
|
links.delete()
|
|
return super(UnlinkView, self).form_valid(form)
|
|
|
|
def get_context_data(self, **kwargs):
|
|
context = super(UnlinkView, self).get_context_data(**kwargs)
|
|
if self.must_set_password():
|
|
context['no_password'] = True
|
|
return context
|
|
|
|
def post(self, request, *args, **kwargs):
|
|
if 'cancel' in request.POST:
|
|
return a2_utils.redirect(request, 'account_management')
|
|
return super(UnlinkView, self).post(request, *args, **kwargs)
|
|
|
|
|
|
login_or_link = LoginOrLinkView.as_view()
|
|
registration = RegistrationView.as_view()
|
|
unlink = UnlinkView.as_view()
|
|
|
|
|
|
class LogoutReturnView(View):
|
|
def get(self, request, *args, **kwargs):
|
|
state = request.GET.get('state')
|
|
request.session.pop('fc_id_token', None)
|
|
request.session.pop('fc_id_token_raw', None)
|
|
request.session.pop('fc_user_info', None)
|
|
request.session.pop('fc_data', None)
|
|
states = request.session.pop('fc_states', None)
|
|
next_url = None
|
|
if states and state in states:
|
|
next_url = states[state].get('next')
|
|
if not next_url:
|
|
next_url = reverse('auth_logout')
|
|
return HttpResponseRedirect(next_url)
|
|
|
|
logout = LogoutReturnView.as_view()
|