mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-10-01 08:25:44 -04:00
5310808d3b
If a user tries to do UI Auth via SSO, but uses the wrong account on the SSO IdP, try to give them a better error. Previously, the UIA would claim to be successful, but then the operation in question would simply fail with "auth fail". Instead, serve up an error page which explains the failure.
721 lines
26 KiB
Python
721 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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import logging
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from typing import TYPE_CHECKING, Awaitable, Callable, Dict, List, Mapping, Optional
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from urllib.parse import urlencode
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import attr
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from typing_extensions import NoReturn, Protocol
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from twisted.web.http import Request
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from synapse.api.errors import Codes, RedirectException, SynapseError
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from synapse.handlers.ui_auth import UIAuthSessionDataConstants
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from synapse.http import get_request_user_agent
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from synapse.http.server import respond_with_html
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from synapse.http.site import SynapseRequest
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from synapse.types import JsonDict, UserID, contains_invalid_mxid_characters
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from synapse.util.async_helpers import Linearizer
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from synapse.util.stringutils import random_string
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class MappingException(Exception):
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"""Used to catch errors when mapping an SSO response to user attributes.
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Note that the msg that is raised is shown to end-users.
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"""
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class SsoIdentityProvider(Protocol):
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"""Abstract base class to be implemented by SSO Identity Providers
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An Identity Provider, or IdP, is an external HTTP service which authenticates a user
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to say whether they should be allowed to log in, or perform a given action.
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Synapse supports various implementations of IdPs, including OpenID Connect, SAML,
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and CAS.
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The main entry point is `handle_redirect_request`, which should return a URI to
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redirect the user's browser to the IdP's authentication page.
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Each IdP should be registered with the SsoHandler via
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`hs.get_sso_handler().register_identity_provider()`, so that requests to
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`/_matrix/client/r0/login/sso/redirect` can be correctly dispatched.
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"""
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@property
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@abc.abstractmethod
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def idp_id(self) -> str:
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"""A unique identifier for this SSO provider
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Eg, "saml", "cas", "github"
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"""
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@property
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@abc.abstractmethod
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def idp_name(self) -> str:
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"""User-facing name for this provider"""
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@abc.abstractmethod
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async def handle_redirect_request(
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self,
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request: SynapseRequest,
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client_redirect_url: Optional[bytes],
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ui_auth_session_id: Optional[str] = None,
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) -> str:
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"""Handle an incoming request to /login/sso/redirect
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Args:
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request: the incoming HTTP request
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client_redirect_url: the URL that we should redirect the
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client to after login (or None for UI Auth).
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ui_auth_session_id: The session ID of the ongoing UI Auth (or
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None if this is a login).
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Returns:
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URL to redirect to
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"""
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raise NotImplementedError()
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@attr.s
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class UserAttributes:
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# the localpart of the mxid that the mapper has assigned to the user.
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# if `None`, the mapper has not picked a userid, and the user should be prompted to
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# enter one.
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localpart = attr.ib(type=Optional[str])
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display_name = attr.ib(type=Optional[str], default=None)
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emails = attr.ib(type=List[str], default=attr.Factory(list))
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@attr.s(slots=True)
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class UsernameMappingSession:
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"""Data we track about SSO sessions"""
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# A unique identifier for this SSO provider, e.g. "oidc" or "saml".
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auth_provider_id = attr.ib(type=str)
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# user ID on the IdP server
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remote_user_id = attr.ib(type=str)
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# attributes returned by the ID mapper
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display_name = attr.ib(type=Optional[str])
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emails = attr.ib(type=List[str])
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# An optional dictionary of extra attributes to be provided to the client in the
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# login response.
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extra_login_attributes = attr.ib(type=Optional[JsonDict])
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# where to redirect the client back to
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client_redirect_url = attr.ib(type=str)
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# expiry time for the session, in milliseconds
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expiry_time_ms = attr.ib(type=int)
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# the HTTP cookie used to track the mapping session id
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USERNAME_MAPPING_SESSION_COOKIE_NAME = b"username_mapping_session"
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class SsoHandler:
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# The number of attempts to ask the mapping provider for when generating an MXID.
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_MAP_USERNAME_RETRIES = 1000
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# the time a UsernameMappingSession remains valid for
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_MAPPING_SESSION_VALIDITY_PERIOD_MS = 15 * 60 * 1000
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def __init__(self, hs: "HomeServer"):
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self._clock = hs.get_clock()
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self._store = hs.get_datastore()
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self._server_name = hs.hostname
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self._registration_handler = hs.get_registration_handler()
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self._error_template = hs.config.sso_error_template
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self._bad_user_template = hs.config.sso_auth_bad_user_template
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self._auth_handler = hs.get_auth_handler()
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# a lock on the mappings
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self._mapping_lock = Linearizer(name="sso_user_mapping", clock=hs.get_clock())
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# a map from session id to session data
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self._username_mapping_sessions = {} # type: Dict[str, UsernameMappingSession]
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# map from idp_id to SsoIdentityProvider
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self._identity_providers = {} # type: Dict[str, SsoIdentityProvider]
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def register_identity_provider(self, p: SsoIdentityProvider):
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p_id = p.idp_id
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assert p_id not in self._identity_providers
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self._identity_providers[p_id] = p
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def get_identity_providers(self) -> Mapping[str, SsoIdentityProvider]:
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"""Get the configured identity providers"""
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return self._identity_providers
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async def get_identity_providers_for_user(
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self, user_id: str
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) -> Mapping[str, SsoIdentityProvider]:
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"""Get the SsoIdentityProviders which a user has used
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Given a user id, get the identity providers that that user has used to log in
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with in the past (and thus could use to re-identify themselves for UI Auth).
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Args:
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user_id: MXID of user to look up
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Raises:
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a map of idp_id to SsoIdentityProvider
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"""
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external_ids = await self._store.get_external_ids_by_user(user_id)
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valid_idps = {}
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for idp_id, _ in external_ids:
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idp = self._identity_providers.get(idp_id)
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if not idp:
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logger.warning(
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"User %r has an SSO mapping for IdP %r, but this is no longer "
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"configured.",
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user_id,
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idp_id,
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)
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else:
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valid_idps[idp_id] = idp
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return valid_idps
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def render_error(
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self,
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request: Request,
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error: str,
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error_description: Optional[str] = None,
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code: int = 400,
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) -> None:
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"""Renders the error template and responds with it.
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This is used to show errors to the user. The template of this page can
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be found under `synapse/res/templates/sso_error.html`.
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Args:
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request: The incoming request from the browser.
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We'll respond with an HTML page describing the error.
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error: A technical identifier for this error.
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error_description: A human-readable description of the error.
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code: The integer error code (an HTTP response code)
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"""
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html = self._error_template.render(
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error=error, error_description=error_description
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)
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respond_with_html(request, code, html)
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async def handle_redirect_request(
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self, request: SynapseRequest, client_redirect_url: bytes,
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) -> str:
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"""Handle a request to /login/sso/redirect
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Args:
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request: incoming HTTP request
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client_redirect_url: the URL that we should redirect the
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client to after login.
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Returns:
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the URI to redirect to
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"""
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if not self._identity_providers:
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raise SynapseError(
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400, "Homeserver not configured for SSO.", errcode=Codes.UNRECOGNIZED
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)
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# if we only have one auth provider, redirect to it directly
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if len(self._identity_providers) == 1:
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ap = next(iter(self._identity_providers.values()))
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return await ap.handle_redirect_request(request, client_redirect_url)
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# otherwise, redirect to the IDP picker
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return "/_synapse/client/pick_idp?" + urlencode(
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(("redirectUrl", client_redirect_url),)
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)
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async def get_sso_user_by_remote_user_id(
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self, auth_provider_id: str, remote_user_id: str
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) -> Optional[str]:
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"""
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Maps the user ID of a remote IdP to a mxid for a previously seen user.
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If the user has not been seen yet, this will return None.
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Args:
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auth_provider_id: A unique identifier for this SSO provider, e.g.
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"oidc" or "saml".
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remote_user_id: The user ID according to the remote IdP. This might
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be an e-mail address, a GUID, or some other form. It must be
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unique and immutable.
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Returns:
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The mxid of a previously seen user.
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"""
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logger.debug(
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"Looking for existing mapping for user %s:%s",
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auth_provider_id,
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remote_user_id,
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)
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# Check if we already have a mapping for this user.
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previously_registered_user_id = await self._store.get_user_by_external_id(
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auth_provider_id, remote_user_id,
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)
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# A match was found, return the user ID.
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if previously_registered_user_id is not None:
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logger.info(
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"Found existing mapping for IdP '%s' and remote_user_id '%s': %s",
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auth_provider_id,
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remote_user_id,
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previously_registered_user_id,
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)
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return previously_registered_user_id
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# No match.
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return None
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async def complete_sso_login_request(
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self,
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auth_provider_id: str,
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remote_user_id: str,
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request: SynapseRequest,
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client_redirect_url: str,
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sso_to_matrix_id_mapper: Callable[[int], Awaitable[UserAttributes]],
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grandfather_existing_users: Callable[[], Awaitable[Optional[str]]],
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extra_login_attributes: Optional[JsonDict] = None,
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) -> None:
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"""
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Given an SSO ID, retrieve the user ID for it and possibly register the user.
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This first checks if the SSO ID has previously been linked to a matrix ID,
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if it has that matrix ID is returned regardless of the current mapping
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logic.
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If a callable is provided for grandfathering users, it is called and can
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potentially return a matrix ID to use. If it does, the SSO ID is linked to
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this matrix ID for subsequent calls.
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The mapping function is called (potentially multiple times) to generate
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a localpart for the user.
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If an unused localpart is generated, the user is registered from the
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given user-agent and IP address and the SSO ID is linked to this matrix
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ID for subsequent calls.
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Finally, we generate a redirect to the supplied redirect uri, with a login token
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Args:
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auth_provider_id: A unique identifier for this SSO provider, e.g.
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"oidc" or "saml".
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remote_user_id: The unique identifier from the SSO provider.
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request: The request to respond to
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client_redirect_url: The redirect URL passed in by the client.
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sso_to_matrix_id_mapper: A callable to generate the user attributes.
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The only parameter is an integer which represents the amount of
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times the returned mxid localpart mapping has failed.
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It is expected that the mapper can raise two exceptions, which
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will get passed through to the caller:
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MappingException if there was a problem mapping the response
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to the user.
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RedirectException to redirect to an additional page (e.g.
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to prompt the user for more information).
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grandfather_existing_users: A callable which can return an previously
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existing matrix ID. The SSO ID is then linked to the returned
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matrix ID.
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extra_login_attributes: An optional dictionary of extra
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attributes to be provided to the client in the login response.
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Raises:
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MappingException if there was a problem mapping the response to a user.
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RedirectException: if the mapping provider needs to redirect the user
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to an additional page. (e.g. to prompt for more information)
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"""
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# grab a lock while we try to find a mapping for this user. This seems...
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# optimistic, especially for implementations that end up redirecting to
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# interstitial pages.
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with await self._mapping_lock.queue(auth_provider_id):
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# first of all, check if we already have a mapping for this user
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user_id = await self.get_sso_user_by_remote_user_id(
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auth_provider_id, remote_user_id,
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)
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# Check for grandfathering of users.
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if not user_id:
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user_id = await grandfather_existing_users()
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if user_id:
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# Future logins should also match this user ID.
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await self._store.record_user_external_id(
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auth_provider_id, remote_user_id, user_id
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)
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# Otherwise, generate a new user.
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if not user_id:
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attributes = await self._call_attribute_mapper(sso_to_matrix_id_mapper)
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if attributes.localpart is None:
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# the mapper doesn't return a username. bail out with a redirect to
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# the username picker.
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await self._redirect_to_username_picker(
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auth_provider_id,
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remote_user_id,
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attributes,
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client_redirect_url,
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extra_login_attributes,
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)
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user_id = await self._register_mapped_user(
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attributes,
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auth_provider_id,
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remote_user_id,
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get_request_user_agent(request),
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request.getClientIP(),
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)
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await self._auth_handler.complete_sso_login(
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user_id, request, client_redirect_url, extra_login_attributes
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)
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async def _call_attribute_mapper(
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self, sso_to_matrix_id_mapper: Callable[[int], Awaitable[UserAttributes]],
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) -> UserAttributes:
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"""Call the attribute mapper function in a loop, until we get a unique userid"""
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for i in range(self._MAP_USERNAME_RETRIES):
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try:
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attributes = await sso_to_matrix_id_mapper(i)
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except (RedirectException, MappingException):
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# Mapping providers are allowed to issue a redirect (e.g. to ask
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# the user for more information) and can issue a mapping exception
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# if a name cannot be generated.
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raise
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except Exception as e:
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# Any other exception is unexpected.
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raise MappingException(
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"Could not extract user attributes from SSO response."
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) from e
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logger.debug(
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"Retrieved user attributes from user mapping provider: %r (attempt %d)",
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attributes,
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i,
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)
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if not attributes.localpart:
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# the mapper has not picked a localpart
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return attributes
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# Check if this mxid already exists
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user_id = UserID(attributes.localpart, self._server_name).to_string()
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if not await self._store.get_users_by_id_case_insensitive(user_id):
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# This mxid is free
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break
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else:
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# Unable to generate a username in 1000 iterations
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# Break and return error to the user
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raise MappingException(
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"Unable to generate a Matrix ID from the SSO response"
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)
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return attributes
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async def _redirect_to_username_picker(
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self,
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auth_provider_id: str,
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remote_user_id: str,
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attributes: UserAttributes,
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client_redirect_url: str,
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extra_login_attributes: Optional[JsonDict],
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) -> NoReturn:
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"""Creates a UsernameMappingSession and redirects the browser
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Called if the user mapping provider doesn't return a localpart for a new user.
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Raises a RedirectException which redirects the browser to the username picker.
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Args:
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auth_provider_id: A unique identifier for this SSO provider, e.g.
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"oidc" or "saml".
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remote_user_id: The unique identifier from the SSO provider.
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attributes: the user attributes returned by the user mapping provider.
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client_redirect_url: The redirect URL passed in by the client, which we
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will eventually redirect back to.
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extra_login_attributes: An optional dictionary of extra
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attributes to be provided to the client in the login response.
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Raises:
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RedirectException
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"""
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session_id = random_string(16)
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now = self._clock.time_msec()
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session = UsernameMappingSession(
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auth_provider_id=auth_provider_id,
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remote_user_id=remote_user_id,
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display_name=attributes.display_name,
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emails=attributes.emails,
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client_redirect_url=client_redirect_url,
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expiry_time_ms=now + self._MAPPING_SESSION_VALIDITY_PERIOD_MS,
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extra_login_attributes=extra_login_attributes,
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)
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self._username_mapping_sessions[session_id] = session
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logger.info("Recorded registration session id %s", session_id)
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# Set the cookie and redirect to the username picker
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e = RedirectException(b"/_synapse/client/pick_username")
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e.cookies.append(
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b"%s=%s; path=/"
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% (USERNAME_MAPPING_SESSION_COOKIE_NAME, session_id.encode("ascii"))
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)
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raise e
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async def _register_mapped_user(
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self,
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attributes: UserAttributes,
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auth_provider_id: str,
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remote_user_id: str,
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user_agent: str,
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ip_address: str,
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) -> str:
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"""Register a new SSO user.
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This is called once we have successfully mapped the remote user id onto a local
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user id, one way or another.
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Args:
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|
attributes: user attributes returned by the user mapping provider,
|
|
including a non-empty localpart.
|
|
|
|
auth_provider_id: A unique identifier for this SSO provider, e.g.
|
|
"oidc" or "saml".
|
|
|
|
remote_user_id: The unique identifier from the SSO provider.
|
|
|
|
user_agent: The user-agent in the HTTP request (used for potential
|
|
shadow-banning.)
|
|
|
|
ip_address: The IP address of the requester (used for potential
|
|
shadow-banning.)
|
|
|
|
Raises:
|
|
a MappingException if the localpart is invalid.
|
|
|
|
a SynapseError with code 400 and errcode Codes.USER_IN_USE if the localpart
|
|
is already taken.
|
|
"""
|
|
|
|
# Since the localpart is provided via a potentially untrusted module,
|
|
# ensure the MXID is valid before registering.
|
|
if not attributes.localpart or contains_invalid_mxid_characters(
|
|
attributes.localpart
|
|
):
|
|
raise MappingException("localpart is invalid: %s" % (attributes.localpart,))
|
|
|
|
logger.debug("Mapped SSO user to local part %s", attributes.localpart)
|
|
registered_user_id = await self._registration_handler.register_user(
|
|
localpart=attributes.localpart,
|
|
default_display_name=attributes.display_name,
|
|
bind_emails=attributes.emails,
|
|
user_agent_ips=[(user_agent, ip_address)],
|
|
)
|
|
|
|
await self._store.record_user_external_id(
|
|
auth_provider_id, remote_user_id, registered_user_id
|
|
)
|
|
return registered_user_id
|
|
|
|
async def complete_sso_ui_auth_request(
|
|
self,
|
|
auth_provider_id: str,
|
|
remote_user_id: str,
|
|
ui_auth_session_id: str,
|
|
request: Request,
|
|
) -> None:
|
|
"""
|
|
Given an SSO ID, retrieve the user ID for it and complete UIA.
|
|
|
|
Note that this requires that the user is mapped in the "user_external_ids"
|
|
table. This will be the case if they have ever logged in via SAML or OIDC in
|
|
recentish synapse versions, but may not be for older users.
|
|
|
|
Args:
|
|
auth_provider_id: A unique identifier for this SSO provider, e.g.
|
|
"oidc" or "saml".
|
|
remote_user_id: The unique identifier from the SSO provider.
|
|
ui_auth_session_id: The ID of the user-interactive auth session.
|
|
request: The request to complete.
|
|
"""
|
|
|
|
user_id = await self.get_sso_user_by_remote_user_id(
|
|
auth_provider_id, remote_user_id,
|
|
)
|
|
|
|
user_id_to_verify = await self._auth_handler.get_session_data(
|
|
ui_auth_session_id, UIAuthSessionDataConstants.REQUEST_USER_ID
|
|
) # type: str
|
|
|
|
if not user_id:
|
|
logger.warning(
|
|
"Remote user %s/%s has not previously logged in here: UIA will fail",
|
|
auth_provider_id,
|
|
remote_user_id,
|
|
)
|
|
elif user_id != user_id_to_verify:
|
|
logger.warning(
|
|
"Remote user %s/%s mapped onto incorrect user %s: UIA will fail",
|
|
auth_provider_id,
|
|
remote_user_id,
|
|
user_id,
|
|
)
|
|
else:
|
|
# success!
|
|
await self._auth_handler.complete_sso_ui_auth(
|
|
user_id, ui_auth_session_id, request
|
|
)
|
|
return
|
|
|
|
# the user_id didn't match: mark the stage of the authentication as unsuccessful
|
|
await self._store.mark_ui_auth_stage_complete(
|
|
ui_auth_session_id, LoginType.SSO, ""
|
|
)
|
|
|
|
# render an error page.
|
|
html = self._bad_user_template.render(
|
|
server_name=self._server_name, user_id_to_verify=user_id_to_verify,
|
|
)
|
|
respond_with_html(request, 200, html)
|
|
|
|
async def check_username_availability(
|
|
self, localpart: str, session_id: str,
|
|
) -> bool:
|
|
"""Handle an "is username available" callback check
|
|
|
|
Args:
|
|
localpart: desired localpart
|
|
session_id: the session id for the username picker
|
|
Returns:
|
|
True if the username is available
|
|
Raises:
|
|
SynapseError if the localpart is invalid or the session is unknown
|
|
"""
|
|
|
|
# make sure that there is a valid mapping session, to stop people dictionary-
|
|
# scanning for accounts
|
|
|
|
self._expire_old_sessions()
|
|
session = self._username_mapping_sessions.get(session_id)
|
|
if not session:
|
|
logger.info("Couldn't find session id %s", session_id)
|
|
raise SynapseError(400, "unknown session")
|
|
|
|
logger.info(
|
|
"[session %s] Checking for availability of username %s",
|
|
session_id,
|
|
localpart,
|
|
)
|
|
|
|
if contains_invalid_mxid_characters(localpart):
|
|
raise SynapseError(400, "localpart is invalid: %s" % (localpart,))
|
|
user_id = UserID(localpart, self._server_name).to_string()
|
|
user_infos = await self._store.get_users_by_id_case_insensitive(user_id)
|
|
|
|
logger.info("[session %s] users: %s", session_id, user_infos)
|
|
return not user_infos
|
|
|
|
async def handle_submit_username_request(
|
|
self, request: SynapseRequest, localpart: str, session_id: str
|
|
) -> None:
|
|
"""Handle a request to the username-picker 'submit' endpoint
|
|
|
|
Will serve an HTTP response to the request.
|
|
|
|
Args:
|
|
request: HTTP request
|
|
localpart: localpart requested by the user
|
|
session_id: ID of the username mapping session, extracted from a cookie
|
|
"""
|
|
self._expire_old_sessions()
|
|
session = self._username_mapping_sessions.get(session_id)
|
|
if not session:
|
|
logger.info("Couldn't find session id %s", session_id)
|
|
raise SynapseError(400, "unknown session")
|
|
|
|
logger.info("[session %s] Registering localpart %s", session_id, localpart)
|
|
|
|
attributes = UserAttributes(
|
|
localpart=localpart,
|
|
display_name=session.display_name,
|
|
emails=session.emails,
|
|
)
|
|
|
|
# the following will raise a 400 error if the username has been taken in the
|
|
# meantime.
|
|
user_id = await self._register_mapped_user(
|
|
attributes,
|
|
session.auth_provider_id,
|
|
session.remote_user_id,
|
|
get_request_user_agent(request),
|
|
request.getClientIP(),
|
|
)
|
|
|
|
logger.info("[session %s] Registered userid %s", session_id, user_id)
|
|
|
|
# delete the mapping session and the cookie
|
|
del self._username_mapping_sessions[session_id]
|
|
|
|
# delete the cookie
|
|
request.addCookie(
|
|
USERNAME_MAPPING_SESSION_COOKIE_NAME,
|
|
b"",
|
|
expires=b"Thu, 01 Jan 1970 00:00:00 GMT",
|
|
path=b"/",
|
|
)
|
|
|
|
await self._auth_handler.complete_sso_login(
|
|
user_id,
|
|
request,
|
|
session.client_redirect_url,
|
|
session.extra_login_attributes,
|
|
)
|
|
|
|
def _expire_old_sessions(self):
|
|
to_expire = []
|
|
now = int(self._clock.time_msec())
|
|
|
|
for session_id, session in self._username_mapping_sessions.items():
|
|
if session.expiry_time_ms <= now:
|
|
to_expire.append(session_id)
|
|
|
|
for session_id in to_expire:
|
|
logger.info("Expiring mapping session %s", session_id)
|
|
del self._username_mapping_sessions[session_id]
|