mirror of https://github.com/zulip/zulip.git
481 lines
18 KiB
Python
481 lines
18 KiB
Python
from __future__ import absolute_import
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import logging
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from typing import Any, Dict, List, Set, Tuple, Optional, Text
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from django.contrib.auth.backends import RemoteUserBackend
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from django.conf import settings
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from django.http import HttpResponse
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import django.contrib.auth
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from django_auth_ldap.backend import LDAPBackend, _LDAPUser
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from zerver.lib.actions import do_create_user
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from zerver.models import UserProfile, Realm, get_user_profile_by_id, \
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get_user_profile_by_email, remote_user_to_email, email_to_username, \
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get_realm, get_realm_by_email_domain
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from apiclient.sample_tools import client as googleapiclient
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from oauth2client.crypt import AppIdentityError
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from social_core.backends.github import GithubOAuth2, GithubOrganizationOAuth2, \
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GithubTeamOAuth2
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from social_core.exceptions import AuthFailed, SocialAuthBaseException
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from django.contrib.auth import authenticate
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from zerver.lib.users import check_full_name
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from zerver.lib.request import JsonableError
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from zerver.lib.utils import check_subdomain, get_subdomain
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def pad_method_dict(method_dict):
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# type: (Dict[Text, bool]) -> Dict[Text, bool]
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"""Pads an authentication methods dict to contain all auth backends
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supported by the software, regardless of whether they are
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configured on this server"""
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for key in AUTH_BACKEND_NAME_MAP:
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if key not in method_dict:
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method_dict[key] = False
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return method_dict
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def auth_enabled_helper(backends_to_check, realm):
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# type: (List[Text], Optional[Realm]) -> bool
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if realm is not None:
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enabled_method_dict = realm.authentication_methods_dict()
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pad_method_dict(enabled_method_dict)
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else:
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enabled_method_dict = dict((method, True) for method in Realm.AUTHENTICATION_FLAGS)
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pad_method_dict(enabled_method_dict)
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for supported_backend in django.contrib.auth.get_backends():
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for backend_name in backends_to_check:
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backend = AUTH_BACKEND_NAME_MAP[backend_name]
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if enabled_method_dict[backend_name] and isinstance(supported_backend, backend):
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return True
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return False
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def ldap_auth_enabled(realm=None):
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# type: (Optional[Realm]) -> bool
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return auth_enabled_helper([u'LDAP'], realm)
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def email_auth_enabled(realm=None):
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# type: (Optional[Realm]) -> bool
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return auth_enabled_helper([u'Email'], realm)
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def password_auth_enabled(realm=None):
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# type: (Optional[Realm]) -> bool
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return ldap_auth_enabled(realm) or email_auth_enabled(realm)
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def dev_auth_enabled(realm=None):
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# type: (Optional[Realm]) -> bool
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return auth_enabled_helper([u'Dev'], realm)
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def google_auth_enabled(realm=None):
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# type: (Optional[Realm]) -> bool
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return auth_enabled_helper([u'Google'], realm)
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def github_auth_enabled(realm=None):
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# type: (Optional[Realm]) -> bool
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return auth_enabled_helper([u'GitHub'], realm)
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def common_get_active_user_by_email(email, return_data=None):
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# type: (Text, Optional[Dict[str, Any]]) -> Optional[UserProfile]
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try:
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user_profile = get_user_profile_by_email(email)
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except UserProfile.DoesNotExist:
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return None
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if not user_profile.is_active:
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if return_data is not None:
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return_data['inactive_user'] = True
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return None
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if user_profile.realm.deactivated:
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if return_data is not None:
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return_data['inactive_realm'] = True
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return None
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return user_profile
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class ZulipAuthMixin(object):
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def get_user(self, user_profile_id):
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# type: (int) -> Optional[UserProfile]
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""" Get a UserProfile object from the user_profile_id. """
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try:
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return get_user_profile_by_id(user_profile_id)
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except UserProfile.DoesNotExist:
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return None
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class SocialAuthMixin(ZulipAuthMixin):
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auth_backend_name = None # type: Text
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def get_email_address(self, *args, **kwargs):
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# type: (*Any, **Any) -> Text
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raise NotImplementedError
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def get_full_name(self, *args, **kwargs):
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# type: (*Any, **Any) -> Text
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raise NotImplementedError
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def authenticate(self, *args, **kwargs):
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# type: (*Any, **Any) -> Optional[UserProfile]
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return_data = kwargs.get('return_data', {})
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email_address = self.get_email_address(*args, **kwargs)
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if not email_address:
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return None
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try:
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user_profile = get_user_profile_by_email(email_address)
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except UserProfile.DoesNotExist:
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return_data["valid_attestation"] = True
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return None
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if not user_profile.is_active:
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return_data["inactive_user"] = True
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return None
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if user_profile.realm.deactivated:
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return_data["inactive_realm"] = True
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return None
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if not check_subdomain(kwargs.get("realm_subdomain"),
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user_profile.realm.subdomain):
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return_data["invalid_subdomain"] = True
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return None
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if not auth_enabled_helper([self.auth_backend_name], user_profile.realm):
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return_data["auth_backend_disabled"] = True
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return None
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return user_profile
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def process_do_auth(self, user_profile, *args, **kwargs):
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# type: (UserProfile, *Any, **Any) -> Optional[HttpResponse]
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# This function needs to be imported from here due to the cyclic
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# dependency.
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from zerver.views.auth import (login_or_register_remote_user,
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redirect_to_subdomain_login_url)
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from zerver.views.registration import redirect_and_log_into_subdomain
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return_data = kwargs.get('return_data', {})
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inactive_user = return_data.get('inactive_user')
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inactive_realm = return_data.get('inactive_realm')
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invalid_subdomain = return_data.get('invalid_subdomain')
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if inactive_user or inactive_realm:
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return None
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strategy = self.strategy # type: ignore # This comes from Python Social Auth.
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request = strategy.request
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email_address = self.get_email_address(*args, **kwargs)
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full_name = self.get_full_name(*args, **kwargs)
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subdomain = strategy.session_get('subdomain')
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if not subdomain:
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return login_or_register_remote_user(request, email_address,
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user_profile, full_name,
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bool(invalid_subdomain))
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try:
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realm = Realm.objects.get(string_id=subdomain)
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except Realm.DoesNotExist:
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return redirect_to_subdomain_login_url()
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return redirect_and_log_into_subdomain(realm, full_name, email_address)
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def auth_complete(self, *args, **kwargs):
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# type: (*Any, **Any) -> Optional[HttpResponse]
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try:
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# Call the auth_complete method of BaseOAuth2 is Python Social Auth
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return super(SocialAuthMixin, self).auth_complete(*args, **kwargs) # type: ignore
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except AuthFailed:
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return None
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except SocialAuthBaseException as e:
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logging.exception(e)
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return None
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class ZulipDummyBackend(ZulipAuthMixin):
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"""
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Used when we want to log you in but we don't know which backend to use.
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"""
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def authenticate(self, username=None, realm_subdomain=None, use_dummy_backend=False,
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return_data=None):
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# type: (Optional[Text], Optional[Text], bool, Optional[Dict[str, Any]]) -> Optional[UserProfile]
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if use_dummy_backend:
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user_profile = common_get_active_user_by_email(username)
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if user_profile is None:
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return None
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if not check_subdomain(realm_subdomain, user_profile.realm.subdomain):
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return_data["invalid_subdomain"] = True
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return None
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return user_profile
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return None
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class EmailAuthBackend(ZulipAuthMixin):
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"""
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Email Authentication Backend
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Allows a user to sign in using an email/password pair rather than
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a username/password pair.
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"""
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def authenticate(self, username=None, password=None, realm_subdomain=None, return_data=None):
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# type: (Optional[Text], Optional[str], Optional[Text], Optional[Dict[str, Any]]) -> Optional[UserProfile]
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""" Authenticate a user based on email address as the user name. """
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if username is None or password is None:
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# Return immediately. Otherwise we will look for a SQL row with
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# NULL username. While that's probably harmless, it's needless
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# exposure.
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return None
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user_profile = common_get_active_user_by_email(username, return_data=return_data)
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if user_profile is None:
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return None
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if not password_auth_enabled(user_profile.realm):
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if return_data is not None:
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return_data['password_auth_disabled'] = True
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return None
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if not email_auth_enabled(user_profile.realm):
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if return_data is not None:
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return_data['email_auth_disabled'] = True
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return None
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if user_profile.check_password(password):
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if not check_subdomain(realm_subdomain, user_profile.realm.subdomain):
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return_data["invalid_subdomain"] = True
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return None
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return user_profile
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return None
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class GoogleMobileOauth2Backend(ZulipAuthMixin):
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"""
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Google Apps authentication for mobile devices
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Allows a user to sign in using a Google-issued OAuth2 token.
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Ref:
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https://developers.google.com/+/mobile/android/sign-in#server-side_access_for_your_app
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https://developers.google.com/accounts/docs/CrossClientAuth#offlineAccess
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"""
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def authenticate(self, google_oauth2_token=None, realm_subdomain=None, return_data={}):
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# type: (Optional[str], Optional[Text], Dict[str, Any]) -> Optional[UserProfile]
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try:
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token_payload = googleapiclient.verify_id_token(google_oauth2_token, settings.GOOGLE_CLIENT_ID)
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except AppIdentityError:
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return None
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if token_payload["email_verified"] in (True, "true"):
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try:
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user_profile = get_user_profile_by_email(token_payload["email"])
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except UserProfile.DoesNotExist:
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return_data["valid_attestation"] = True
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return None
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if not user_profile.is_active:
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return_data["inactive_user"] = True
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return None
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if user_profile.realm.deactivated:
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return_data["inactive_realm"] = True
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return None
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if not check_subdomain(realm_subdomain, user_profile.realm.subdomain):
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return_data["invalid_subdomain"] = True
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return None
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if not google_auth_enabled(realm=user_profile.realm):
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return_data["google_auth_disabled"] = True
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return None
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return user_profile
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else:
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return_data["valid_attestation"] = False
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return None
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class ZulipRemoteUserBackend(RemoteUserBackend):
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create_unknown_user = False
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def authenticate(self, remote_user, realm_subdomain=None):
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# type: (str, Optional[Text]) -> Optional[UserProfile]
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if not remote_user:
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return None
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email = remote_user_to_email(remote_user)
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user_profile = common_get_active_user_by_email(email)
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if user_profile is None:
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return None
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if not check_subdomain(realm_subdomain, user_profile.realm.subdomain):
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return None
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if not auth_enabled_helper([u"RemoteUser"], user_profile.realm):
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return None
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return user_profile
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class ZulipLDAPException(Exception):
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pass
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class ZulipLDAPAuthBackendBase(ZulipAuthMixin, LDAPBackend):
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# Don't use Django LDAP's permissions functions
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def has_perm(self, user, perm, obj=None):
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# type: (UserProfile, Any, Any) -> bool
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# Using Any type is safe because we are not doing anything with
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# the arguments.
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return False
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def has_module_perms(self, user, app_label):
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# type: (UserProfile, str) -> bool
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return False
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def get_all_permissions(self, user, obj=None):
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# type: (UserProfile, Any) -> Set
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# Using Any type is safe because we are not doing anything with
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# the arguments.
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return set()
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def get_group_permissions(self, user, obj=None):
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# type: (UserProfile, Any) -> Set
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# Using Any type is safe because we are not doing anything with
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# the arguments.
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return set()
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def django_to_ldap_username(self, username):
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# type: (Text) -> Text
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if settings.LDAP_APPEND_DOMAIN:
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if not username.endswith("@" + settings.LDAP_APPEND_DOMAIN):
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raise ZulipLDAPException("Username does not match LDAP domain.")
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return email_to_username(username)
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return username
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def ldap_to_django_username(self, username):
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# type: (str) -> str
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if settings.LDAP_APPEND_DOMAIN:
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return "@".join((username, settings.LDAP_APPEND_DOMAIN))
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return username
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class ZulipLDAPAuthBackend(ZulipLDAPAuthBackendBase):
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def authenticate(self, username, password, realm_subdomain=None, return_data=None):
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# type: (Text, str, Optional[Text], Optional[Dict[str, Any]]) -> Optional[UserProfile]
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try:
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if settings.REALMS_HAVE_SUBDOMAINS:
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self._realm = get_realm(realm_subdomain)
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else:
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self._realm = get_realm_by_email_domain(username)
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username = self.django_to_ldap_username(username)
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user_profile = ZulipLDAPAuthBackendBase.authenticate(self, username, password)
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if user_profile is None:
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return None
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if not check_subdomain(realm_subdomain, user_profile.realm.subdomain):
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return None
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return user_profile
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except Realm.DoesNotExist:
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return None
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except ZulipLDAPException:
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return None
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def get_or_create_user(self, username, ldap_user):
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# type: (str, _LDAPUser) -> Tuple[UserProfile, bool]
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try:
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user_profile = get_user_profile_by_email(username)
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if not user_profile.is_active or user_profile.realm.deactivated:
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raise ZulipLDAPException("Realm has been deactivated")
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if not ldap_auth_enabled(user_profile.realm):
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raise ZulipLDAPException("LDAP Authentication is not enabled")
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return user_profile, False
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except UserProfile.DoesNotExist:
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# No need to check for an inactive user since they don't exist yet
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if self._realm.deactivated:
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raise ZulipLDAPException("Realm has been deactivated")
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full_name_attr = settings.AUTH_LDAP_USER_ATTR_MAP["full_name"]
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short_name = full_name = ldap_user.attrs[full_name_attr][0]
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try:
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full_name = check_full_name(full_name)
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except JsonableError as e:
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raise ZulipLDAPException(e.error)
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if "short_name" in settings.AUTH_LDAP_USER_ATTR_MAP:
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short_name_attr = settings.AUTH_LDAP_USER_ATTR_MAP["short_name"]
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short_name = ldap_user.attrs[short_name_attr][0]
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user_profile = do_create_user(username, None, self._realm, full_name, short_name)
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return user_profile, True
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# Just like ZulipLDAPAuthBackend, but doesn't let you log in.
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class ZulipLDAPUserPopulator(ZulipLDAPAuthBackendBase):
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def authenticate(self, username, password, realm_subdomain=None):
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# type: (Text, str, Optional[Text]) -> None
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return None
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class DevAuthBackend(ZulipAuthMixin):
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# Allow logging in as any user without a password.
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# This is used for convenience when developing Zulip.
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def authenticate(self, username, realm_subdomain=None, return_data=None):
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# type: (Text, Optional[Text], Optional[Dict[str, Any]]) -> Optional[UserProfile]
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user_profile = common_get_active_user_by_email(username, return_data=return_data)
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if user_profile is None:
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return None
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if not dev_auth_enabled(user_profile.realm):
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return None
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return user_profile
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class GitHubAuthBackend(SocialAuthMixin, GithubOAuth2):
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auth_backend_name = u"GitHub"
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def get_email_address(self, *args, **kwargs):
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# type: (*Any, **Any) -> Optional[Text]
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try:
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return kwargs['response']['email']
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except KeyError:
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return None
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def get_full_name(self, *args, **kwargs):
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# type: (*Any, **Any) -> Text
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# In case of any error return an empty string. Name is used by
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# the registration page to pre-populate the name field. However,
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# if it is not supplied, our registration process will make sure
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# that the user enters a valid name.
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try:
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name = kwargs['response']['name']
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except KeyError:
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name = ''
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if name is None:
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return ''
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return name
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def do_auth(self, *args, **kwargs):
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# type: (*Any, **Any) -> Optional[HttpResponse]
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kwargs['return_data'] = {}
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request = self.strategy.request
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kwargs['realm_subdomain'] = get_subdomain(request)
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user_profile = None
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team_id = settings.SOCIAL_AUTH_GITHUB_TEAM_ID
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org_name = settings.SOCIAL_AUTH_GITHUB_ORG_NAME
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if (team_id is None and org_name is None):
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try:
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user_profile = GithubOAuth2.do_auth(self, *args, **kwargs)
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except AuthFailed:
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logging.info("User authentication failed.")
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user_profile = None
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elif (team_id):
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backend = GithubTeamOAuth2(self.strategy, self.redirect_uri)
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try:
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user_profile = backend.do_auth(*args, **kwargs)
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except AuthFailed:
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logging.info("User is not member of GitHub team.")
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user_profile = None
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elif (org_name):
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backend = GithubOrganizationOAuth2(self.strategy, self.redirect_uri)
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try:
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user_profile = backend.do_auth(*args, **kwargs)
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except AuthFailed:
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logging.info("User is not member of GitHub organization.")
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user_profile = None
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return self.process_do_auth(user_profile, *args, **kwargs)
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AUTH_BACKEND_NAME_MAP = {
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u'Dev': DevAuthBackend,
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u'Email': EmailAuthBackend,
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u'GitHub': GitHubAuthBackend,
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u'Google': GoogleMobileOauth2Backend,
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u'LDAP': ZulipLDAPAuthBackend,
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u'RemoteUser': ZulipRemoteUserBackend,
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} # type: Dict[Text, Any]
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