mirror of
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d8cc86eff4
Remove type hints from comments which have been added as Python type hints. This helps avoid drift between comments and reality, as well as removing redundant information. Also adds some missing type hints which were simple to fill in.
690 lines
26 KiB
Python
690 lines
26 KiB
Python
# Copyright 2014-2021 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 logging
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import re
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from typing import (
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TYPE_CHECKING,
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Any,
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Awaitable,
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Callable,
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Dict,
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List,
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Optional,
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Tuple,
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Union,
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)
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from typing_extensions import TypedDict
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from synapse.api.constants import ApprovalNoticeMedium
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from synapse.api.errors import (
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Codes,
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InvalidClientTokenError,
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LoginError,
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NotApprovedError,
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SynapseError,
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)
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from synapse.api.ratelimiting import Ratelimiter
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from synapse.api.urls import CLIENT_API_PREFIX
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from synapse.appservice import ApplicationService
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from synapse.handlers.sso import SsoIdentityProvider
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from synapse.http import get_request_uri
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from synapse.http.server import HttpServer, finish_request
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from synapse.http.servlet import (
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RestServlet,
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assert_params_in_dict,
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parse_bytes_from_args,
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parse_json_object_from_request,
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parse_string,
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)
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from synapse.http.site import SynapseRequest
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from synapse.rest.client._base import client_patterns
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from synapse.rest.well_known import WellKnownBuilder
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from synapse.types import JsonDict, UserID
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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 LoginResponse(TypedDict, total=False):
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user_id: str
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access_token: Optional[str]
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home_server: str
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expires_in_ms: Optional[int]
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refresh_token: Optional[str]
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device_id: Optional[str]
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well_known: Optional[Dict[str, Any]]
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class LoginRestServlet(RestServlet):
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PATTERNS = client_patterns("/login$", v1=True)
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CAS_TYPE = "m.login.cas"
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SSO_TYPE = "m.login.sso"
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TOKEN_TYPE = "m.login.token"
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JWT_TYPE = "org.matrix.login.jwt"
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APPSERVICE_TYPE = "m.login.application_service"
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REFRESH_TOKEN_PARAM = "refresh_token"
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def __init__(self, hs: "HomeServer"):
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super().__init__()
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self.hs = hs
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# JWT configuration variables.
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self.jwt_enabled = hs.config.jwt.jwt_enabled
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self.jwt_secret = hs.config.jwt.jwt_secret
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self.jwt_subject_claim = hs.config.jwt.jwt_subject_claim
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self.jwt_algorithm = hs.config.jwt.jwt_algorithm
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self.jwt_issuer = hs.config.jwt.jwt_issuer
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self.jwt_audiences = hs.config.jwt.jwt_audiences
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# SSO configuration.
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self.saml2_enabled = hs.config.saml2.saml2_enabled
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self.cas_enabled = hs.config.cas.cas_enabled
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self.oidc_enabled = hs.config.oidc.oidc_enabled
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self._refresh_tokens_enabled = (
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hs.config.registration.refreshable_access_token_lifetime is not None
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)
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# Whether we need to check if the user has been approved or not.
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self._require_approval = (
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hs.config.experimental.msc3866.enabled
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and hs.config.experimental.msc3866.require_approval_for_new_accounts
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)
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self.auth = hs.get_auth()
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self.clock = hs.get_clock()
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self.auth_handler = self.hs.get_auth_handler()
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self.registration_handler = hs.get_registration_handler()
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self._sso_handler = hs.get_sso_handler()
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self._well_known_builder = WellKnownBuilder(hs)
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self._address_ratelimiter = Ratelimiter(
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store=hs.get_datastores().main,
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clock=hs.get_clock(),
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rate_hz=self.hs.config.ratelimiting.rc_login_address.per_second,
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burst_count=self.hs.config.ratelimiting.rc_login_address.burst_count,
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)
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self._account_ratelimiter = Ratelimiter(
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store=hs.get_datastores().main,
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clock=hs.get_clock(),
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rate_hz=self.hs.config.ratelimiting.rc_login_account.per_second,
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burst_count=self.hs.config.ratelimiting.rc_login_account.burst_count,
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)
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# ensure the CAS/SAML/OIDC handlers are loaded on this worker instance.
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# The reason for this is to ensure that the auth_provider_ids are registered
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# with SsoHandler, which in turn ensures that the login/registration prometheus
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# counters are initialised for the auth_provider_ids.
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_load_sso_handlers(hs)
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def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
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flows: List[JsonDict] = []
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if self.jwt_enabled:
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flows.append({"type": LoginRestServlet.JWT_TYPE})
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if self.cas_enabled:
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# we advertise CAS for backwards compat, though MSC1721 renamed it
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# to SSO.
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flows.append({"type": LoginRestServlet.CAS_TYPE})
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if self.cas_enabled or self.saml2_enabled or self.oidc_enabled:
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flows.append(
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{
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"type": LoginRestServlet.SSO_TYPE,
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"identity_providers": [
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_get_auth_flow_dict_for_idp(idp)
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for idp in self._sso_handler.get_identity_providers().values()
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],
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}
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)
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# While it's valid for us to advertise this login type generally,
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# synapse currently only gives out these tokens as part of the
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# SSO login flow.
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# Generally we don't want to advertise login flows that clients
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# don't know how to implement, since they (currently) will always
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# fall back to the fallback API if they don't understand one of the
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# login flow types returned.
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flows.append({"type": LoginRestServlet.TOKEN_TYPE})
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flows.extend({"type": t} for t in self.auth_handler.get_supported_login_types())
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flows.append({"type": LoginRestServlet.APPSERVICE_TYPE})
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return 200, {"flows": flows}
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async def on_POST(self, request: SynapseRequest) -> Tuple[int, LoginResponse]:
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login_submission = parse_json_object_from_request(request)
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# Check to see if the client requested a refresh token.
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client_requested_refresh_token = login_submission.get(
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LoginRestServlet.REFRESH_TOKEN_PARAM, False
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)
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if not isinstance(client_requested_refresh_token, bool):
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raise SynapseError(400, "`refresh_token` should be true or false.")
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should_issue_refresh_token = (
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self._refresh_tokens_enabled and client_requested_refresh_token
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)
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try:
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if login_submission["type"] == LoginRestServlet.APPSERVICE_TYPE:
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requester = await self.auth.get_user_by_req(request)
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appservice = requester.app_service
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if appservice is None:
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raise InvalidClientTokenError(
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"This login method is only valid for application services"
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)
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if appservice.is_rate_limited():
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await self._address_ratelimiter.ratelimit(
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None, request.getClientAddress().host
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)
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result = await self._do_appservice_login(
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login_submission,
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appservice,
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should_issue_refresh_token=should_issue_refresh_token,
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)
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elif (
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self.jwt_enabled
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and login_submission["type"] == LoginRestServlet.JWT_TYPE
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):
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await self._address_ratelimiter.ratelimit(
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None, request.getClientAddress().host
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)
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result = await self._do_jwt_login(
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login_submission,
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should_issue_refresh_token=should_issue_refresh_token,
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)
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elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
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await self._address_ratelimiter.ratelimit(
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None, request.getClientAddress().host
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)
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result = await self._do_token_login(
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login_submission,
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should_issue_refresh_token=should_issue_refresh_token,
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)
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else:
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await self._address_ratelimiter.ratelimit(
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None, request.getClientAddress().host
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)
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result = await self._do_other_login(
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login_submission,
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should_issue_refresh_token=should_issue_refresh_token,
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)
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except KeyError:
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raise SynapseError(400, "Missing JSON keys.")
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if self._require_approval:
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approved = await self.auth_handler.is_user_approved(result["user_id"])
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if not approved:
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raise NotApprovedError(
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msg="This account is pending approval by a server administrator.",
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approval_notice_medium=ApprovalNoticeMedium.NONE,
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)
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well_known_data = self._well_known_builder.get_well_known()
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if well_known_data:
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result["well_known"] = well_known_data
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return 200, result
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async def _do_appservice_login(
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self,
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login_submission: JsonDict,
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appservice: ApplicationService,
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should_issue_refresh_token: bool = False,
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) -> LoginResponse:
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identifier = login_submission.get("identifier")
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logger.info("Got appservice login request with identifier: %r", identifier)
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if not isinstance(identifier, dict):
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raise SynapseError(
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400, "Invalid identifier in login submission", Codes.INVALID_PARAM
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)
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# this login flow only supports identifiers of type "m.id.user".
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if identifier.get("type") != "m.id.user":
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raise SynapseError(
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400, "Unknown login identifier type", Codes.INVALID_PARAM
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)
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user = identifier.get("user")
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if not isinstance(user, str):
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raise SynapseError(400, "Invalid user in identifier", Codes.INVALID_PARAM)
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if user.startswith("@"):
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qualified_user_id = user
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else:
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qualified_user_id = UserID(user, self.hs.hostname).to_string()
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if not appservice.is_interested_in_user(qualified_user_id):
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raise LoginError(403, "Invalid access_token", errcode=Codes.FORBIDDEN)
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return await self._complete_login(
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qualified_user_id,
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login_submission,
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ratelimit=appservice.is_rate_limited(),
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should_issue_refresh_token=should_issue_refresh_token,
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)
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async def _do_other_login(
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self, login_submission: JsonDict, should_issue_refresh_token: bool = False
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) -> LoginResponse:
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"""Handle non-token/saml/jwt logins
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Args:
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login_submission:
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should_issue_refresh_token: True if this login should issue
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a refresh token alongside the access token.
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Returns:
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HTTP response
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"""
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# Log the request we got, but only certain fields to minimise the chance of
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# logging someone's password (even if they accidentally put it in the wrong
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# field)
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logger.info(
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"Got login request with identifier: %r, medium: %r, address: %r, user: %r",
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login_submission.get("identifier"),
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login_submission.get("medium"),
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login_submission.get("address"),
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login_submission.get("user"),
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)
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canonical_user_id, callback = await self.auth_handler.validate_login(
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login_submission, ratelimit=True
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)
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result = await self._complete_login(
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canonical_user_id,
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login_submission,
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callback,
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should_issue_refresh_token=should_issue_refresh_token,
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)
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return result
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async def _complete_login(
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self,
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user_id: str,
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login_submission: JsonDict,
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callback: Optional[Callable[[LoginResponse], Awaitable[None]]] = None,
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create_non_existent_users: bool = False,
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ratelimit: bool = True,
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auth_provider_id: Optional[str] = None,
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should_issue_refresh_token: bool = False,
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auth_provider_session_id: Optional[str] = None,
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) -> LoginResponse:
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"""Called when we've successfully authed the user and now need to
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actually login them in (e.g. create devices). This gets called on
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all successful logins.
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Applies the ratelimiting for successful login attempts against an
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account.
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Args:
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user_id: ID of the user to register.
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login_submission: Dictionary of login information.
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callback: Callback function to run after login.
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create_non_existent_users: Whether to create the user if they don't
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exist. Defaults to False.
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ratelimit: Whether to ratelimit the login request.
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auth_provider_id: The SSO IdP the user used, if any.
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should_issue_refresh_token: True if this login should issue
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a refresh token alongside the access token.
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auth_provider_session_id: The session ID got during login from the SSO IdP.
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Returns:
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Dictionary of account information after successful login.
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"""
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# Before we actually log them in we check if they've already logged in
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# too often. This happens here rather than before as we don't
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# necessarily know the user before now.
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if ratelimit:
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await self._account_ratelimiter.ratelimit(None, user_id.lower())
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if create_non_existent_users:
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canonical_uid = await self.auth_handler.check_user_exists(user_id)
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if not canonical_uid:
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canonical_uid = await self.registration_handler.register_user(
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localpart=UserID.from_string(user_id).localpart
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)
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user_id = canonical_uid
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device_id = login_submission.get("device_id")
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# If device_id is present, check that device_id is not longer than a reasonable 512 characters
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if device_id and len(device_id) > 512:
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raise LoginError(
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400,
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"device_id cannot be longer than 512 characters.",
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errcode=Codes.INVALID_PARAM,
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)
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if self._require_approval:
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approved = await self.auth_handler.is_user_approved(user_id)
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if not approved:
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# If the user isn't approved (and needs to be) we won't allow them to
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# actually log in, so we don't want to create a device/access token.
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return LoginResponse(
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user_id=user_id,
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home_server=self.hs.hostname,
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)
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initial_display_name = login_submission.get("initial_device_display_name")
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(
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device_id,
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access_token,
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valid_until_ms,
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refresh_token,
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) = await self.registration_handler.register_device(
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user_id,
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device_id,
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initial_display_name,
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auth_provider_id=auth_provider_id,
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should_issue_refresh_token=should_issue_refresh_token,
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auth_provider_session_id=auth_provider_session_id,
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)
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result = LoginResponse(
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user_id=user_id,
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access_token=access_token,
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home_server=self.hs.hostname,
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device_id=device_id,
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)
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if valid_until_ms is not None:
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expires_in_ms = valid_until_ms - self.clock.time_msec()
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result["expires_in_ms"] = expires_in_ms
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if refresh_token is not None:
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result["refresh_token"] = refresh_token
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if callback is not None:
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await callback(result)
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return result
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async def _do_token_login(
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self, login_submission: JsonDict, should_issue_refresh_token: bool = False
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) -> LoginResponse:
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"""
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Handle the final stage of SSO login.
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Args:
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login_submission: The JSON request body.
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should_issue_refresh_token: True if this login should issue
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a refresh token alongside the access token.
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Returns:
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The body of the JSON response.
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"""
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token = login_submission["token"]
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res = await self.auth_handler.consume_login_token(token)
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return await self._complete_login(
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res.user_id,
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login_submission,
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self.auth_handler._sso_login_callback,
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auth_provider_id=res.auth_provider_id,
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should_issue_refresh_token=should_issue_refresh_token,
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auth_provider_session_id=res.auth_provider_session_id,
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)
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async def _do_jwt_login(
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self, login_submission: JsonDict, should_issue_refresh_token: bool = False
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) -> LoginResponse:
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token = login_submission.get("token", None)
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if token is None:
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raise LoginError(
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403, "Token field for JWT is missing", errcode=Codes.FORBIDDEN
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)
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from authlib.jose import JsonWebToken, JWTClaims
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from authlib.jose.errors import BadSignatureError, InvalidClaimError, JoseError
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jwt = JsonWebToken([self.jwt_algorithm])
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claim_options = {}
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if self.jwt_issuer is not None:
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claim_options["iss"] = {"value": self.jwt_issuer, "essential": True}
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if self.jwt_audiences is not None:
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claim_options["aud"] = {"values": self.jwt_audiences, "essential": True}
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try:
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claims = jwt.decode(
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token,
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key=self.jwt_secret,
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claims_cls=JWTClaims,
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claims_options=claim_options,
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)
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except BadSignatureError:
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# We handle this case separately to provide a better error message
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raise LoginError(
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403,
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"JWT validation failed: Signature verification failed",
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errcode=Codes.FORBIDDEN,
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)
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except JoseError as e:
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# A JWT error occurred, return some info back to the client.
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raise LoginError(
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403,
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"JWT validation failed: %s" % (str(e),),
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errcode=Codes.FORBIDDEN,
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)
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try:
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claims.validate(leeway=120) # allows 2 min of clock skew
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# Enforce the old behavior which is rolled out in productive
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# servers: if the JWT contains an 'aud' claim but none is
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# configured, the login attempt will fail
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if claims.get("aud") is not None:
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if self.jwt_audiences is None or len(self.jwt_audiences) == 0:
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raise InvalidClaimError("aud")
|
|
except JoseError as e:
|
|
raise LoginError(
|
|
403,
|
|
"JWT validation failed: %s" % (str(e),),
|
|
errcode=Codes.FORBIDDEN,
|
|
)
|
|
|
|
user = claims.get(self.jwt_subject_claim, None)
|
|
if user is None:
|
|
raise LoginError(403, "Invalid JWT", errcode=Codes.FORBIDDEN)
|
|
|
|
user_id = UserID(user, self.hs.hostname).to_string()
|
|
result = await self._complete_login(
|
|
user_id,
|
|
login_submission,
|
|
create_non_existent_users=True,
|
|
should_issue_refresh_token=should_issue_refresh_token,
|
|
)
|
|
return result
|
|
|
|
|
|
def _get_auth_flow_dict_for_idp(idp: SsoIdentityProvider) -> JsonDict:
|
|
"""Return an entry for the login flow dict
|
|
|
|
Returns an entry suitable for inclusion in "identity_providers" in the
|
|
response to GET /_matrix/client/r0/login
|
|
|
|
Args:
|
|
idp: the identity provider to describe
|
|
"""
|
|
e: JsonDict = {"id": idp.idp_id, "name": idp.idp_name}
|
|
if idp.idp_icon:
|
|
e["icon"] = idp.idp_icon
|
|
if idp.idp_brand:
|
|
e["brand"] = idp.idp_brand
|
|
return e
|
|
|
|
|
|
class RefreshTokenServlet(RestServlet):
|
|
PATTERNS = client_patterns("/refresh$")
|
|
|
|
def __init__(self, hs: "HomeServer"):
|
|
self._auth_handler = hs.get_auth_handler()
|
|
self._clock = hs.get_clock()
|
|
self.refreshable_access_token_lifetime = (
|
|
hs.config.registration.refreshable_access_token_lifetime
|
|
)
|
|
self.refresh_token_lifetime = hs.config.registration.refresh_token_lifetime
|
|
|
|
async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
|
|
refresh_submission = parse_json_object_from_request(request)
|
|
|
|
assert_params_in_dict(refresh_submission, ["refresh_token"])
|
|
token = refresh_submission["refresh_token"]
|
|
if not isinstance(token, str):
|
|
raise SynapseError(400, "Invalid param: refresh_token", Codes.INVALID_PARAM)
|
|
|
|
now = self._clock.time_msec()
|
|
access_valid_until_ms = None
|
|
if self.refreshable_access_token_lifetime is not None:
|
|
access_valid_until_ms = now + self.refreshable_access_token_lifetime
|
|
refresh_valid_until_ms = None
|
|
if self.refresh_token_lifetime is not None:
|
|
refresh_valid_until_ms = now + self.refresh_token_lifetime
|
|
|
|
(
|
|
access_token,
|
|
refresh_token,
|
|
actual_access_token_expiry,
|
|
) = await self._auth_handler.refresh_token(
|
|
token, access_valid_until_ms, refresh_valid_until_ms
|
|
)
|
|
|
|
response: Dict[str, Union[str, int]] = {
|
|
"access_token": access_token,
|
|
"refresh_token": refresh_token,
|
|
}
|
|
|
|
# expires_in_ms is only present if the token expires
|
|
if actual_access_token_expiry is not None:
|
|
response["expires_in_ms"] = actual_access_token_expiry - now
|
|
|
|
return 200, response
|
|
|
|
|
|
class SsoRedirectServlet(RestServlet):
|
|
PATTERNS = list(client_patterns("/login/(cas|sso)/redirect$", v1=True)) + [
|
|
re.compile(
|
|
"^"
|
|
+ CLIENT_API_PREFIX
|
|
+ "/(r0|v3)/login/sso/redirect/(?P<idp_id>[A-Za-z0-9_.~-]+)$"
|
|
)
|
|
]
|
|
|
|
def __init__(self, hs: "HomeServer"):
|
|
# make sure that the relevant handlers are instantiated, so that they
|
|
# register themselves with the main SSOHandler.
|
|
_load_sso_handlers(hs)
|
|
self._sso_handler = hs.get_sso_handler()
|
|
self._public_baseurl = hs.config.server.public_baseurl
|
|
|
|
async def on_GET(
|
|
self, request: SynapseRequest, idp_id: Optional[str] = None
|
|
) -> None:
|
|
if not self._public_baseurl:
|
|
raise SynapseError(400, "SSO requires a valid public_baseurl")
|
|
|
|
# if this isn't the expected hostname, redirect to the right one, so that we
|
|
# get our cookies back.
|
|
requested_uri = get_request_uri(request)
|
|
baseurl_bytes = self._public_baseurl.encode("utf-8")
|
|
if not requested_uri.startswith(baseurl_bytes):
|
|
# swap out the incorrect base URL for the right one.
|
|
#
|
|
# The idea here is to redirect from
|
|
# https://foo.bar/whatever/_matrix/...
|
|
# to
|
|
# https://public.baseurl/_matrix/...
|
|
#
|
|
i = requested_uri.index(b"/_matrix")
|
|
new_uri = baseurl_bytes[:-1] + requested_uri[i:]
|
|
logger.info(
|
|
"Requested URI %s is not canonical: redirecting to %s",
|
|
requested_uri.decode("utf-8", errors="replace"),
|
|
new_uri.decode("utf-8", errors="replace"),
|
|
)
|
|
request.redirect(new_uri)
|
|
finish_request(request)
|
|
return
|
|
|
|
args: Dict[bytes, List[bytes]] = request.args # type: ignore
|
|
client_redirect_url = parse_bytes_from_args(args, "redirectUrl", required=True)
|
|
sso_url = await self._sso_handler.handle_redirect_request(
|
|
request,
|
|
client_redirect_url,
|
|
idp_id,
|
|
)
|
|
logger.info("Redirecting to %s", sso_url)
|
|
request.redirect(sso_url)
|
|
finish_request(request)
|
|
|
|
|
|
class CasTicketServlet(RestServlet):
|
|
PATTERNS = client_patterns("/login/cas/ticket", v1=True)
|
|
|
|
def __init__(self, hs: "HomeServer"):
|
|
super().__init__()
|
|
self._cas_handler = hs.get_cas_handler()
|
|
|
|
async def on_GET(self, request: SynapseRequest) -> None:
|
|
client_redirect_url = parse_string(request, "redirectUrl")
|
|
ticket = parse_string(request, "ticket", required=True)
|
|
|
|
# Maybe get a session ID (if this ticket is from user interactive
|
|
# authentication).
|
|
session = parse_string(request, "session")
|
|
|
|
# Either client_redirect_url or session must be provided.
|
|
if not client_redirect_url and not session:
|
|
message = "Missing string query parameter redirectUrl or session"
|
|
raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
|
|
|
|
await self._cas_handler.handle_ticket(
|
|
request, ticket, client_redirect_url, session
|
|
)
|
|
|
|
|
|
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
|
|
LoginRestServlet(hs).register(http_server)
|
|
if hs.config.registration.refreshable_access_token_lifetime is not None:
|
|
RefreshTokenServlet(hs).register(http_server)
|
|
SsoRedirectServlet(hs).register(http_server)
|
|
if hs.config.cas.cas_enabled:
|
|
CasTicketServlet(hs).register(http_server)
|
|
|
|
|
|
def _load_sso_handlers(hs: "HomeServer") -> None:
|
|
"""Ensure that the SSO handlers are loaded, if they are enabled by configuration.
|
|
|
|
This is mostly useful to ensure that the CAS/SAML/OIDC handlers register themselves
|
|
with the main SsoHandler.
|
|
|
|
It's safe to call this multiple times.
|
|
"""
|
|
if hs.config.cas.cas_enabled:
|
|
hs.get_cas_handler()
|
|
if hs.config.saml2.saml2_enabled:
|
|
hs.get_saml_handler()
|
|
if hs.config.oidc.oidc_enabled:
|
|
hs.get_oidc_handler()
|