mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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666 lines
24 KiB
Python
666 lines
24 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.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._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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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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request.get_user_agent(""),
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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,
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including a non-empty localpart.
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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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user_agent: The user-agent in the HTTP request (used for potential
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shadow-banning.)
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ip_address: The IP address of the requester (used for potential
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shadow-banning.)
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Raises:
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a MappingException if the localpart is invalid.
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a SynapseError with code 400 and errcode Codes.USER_IN_USE if the localpart
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is already taken.
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"""
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# Since the localpart is provided via a potentially untrusted module,
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# ensure the MXID is valid before registering.
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if not attributes.localpart or contains_invalid_mxid_characters(
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attributes.localpart
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):
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raise MappingException("localpart is invalid: %s" % (attributes.localpart,))
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logger.debug("Mapped SSO user to local part %s", attributes.localpart)
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registered_user_id = await self._registration_handler.register_user(
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localpart=attributes.localpart,
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default_display_name=attributes.display_name,
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bind_emails=attributes.emails,
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user_agent_ips=[(user_agent, ip_address)],
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)
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await self._store.record_user_external_id(
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auth_provider_id, remote_user_id, registered_user_id
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)
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return registered_user_id
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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,
|
|
)
|
|
|
|
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,
|
|
)
|
|
# Let the UIA flow handle this the same as if they presented creds for a
|
|
# different user.
|
|
user_id = ""
|
|
|
|
await self._auth_handler.complete_sso_ui_auth(
|
|
user_id, ui_auth_session_id, request
|
|
)
|
|
|
|
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,
|
|
request.get_user_agent(""),
|
|
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]
|