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![Richard van der Hoff](/assets/img/avatar_default.png)
The presence of this method was confusing, and mostly present for backwards compatibility. Let's get rid of it. Part of #11733
616 lines
23 KiB
Python
616 lines
23 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.errors import Codes, LoginError, SynapseError
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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: 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: 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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JWT_TYPE_DEPRECATED = "m.login.jwt"
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APPSERVICE_TYPE = "m.login.application_service"
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APPSERVICE_TYPE_UNSTABLE = "uk.half-shot.msc2778.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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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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flows.append({"type": LoginRestServlet.JWT_TYPE_DEPRECATED})
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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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flows.append({"type": LoginRestServlet.APPSERVICE_TYPE_UNSTABLE})
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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"] in (
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LoginRestServlet.APPSERVICE_TYPE,
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LoginRestServlet.APPSERVICE_TYPE_UNSTABLE,
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):
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appservice = self.auth.get_appservice_by_req(request)
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if appservice.is_rate_limited():
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await self._address_ratelimiter.ratelimit(
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None, request.getClientIP()
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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 self.jwt_enabled and (
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login_submission["type"] == LoginRestServlet.JWT_TYPE
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or login_submission["type"] == LoginRestServlet.JWT_TYPE_DEPRECATED
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):
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await self._address_ratelimiter.ratelimit(None, request.getClientIP())
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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(None, request.getClientIP())
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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(None, request.getClientIP())
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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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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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result: 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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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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auth_handler = self.auth_handler
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res = await auth_handler.validate_short_term_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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import jwt
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try:
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payload = jwt.decode(
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token,
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self.jwt_secret,
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algorithms=[self.jwt_algorithm],
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issuer=self.jwt_issuer,
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audience=self.jwt_audiences,
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)
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except jwt.PyJWTError 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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user = payload.get(self.jwt_subject_claim, None)
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if user is None:
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raise LoginError(403, "Invalid JWT", errcode=Codes.FORBIDDEN)
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user_id = UserID(user, self.hs.hostname).to_string()
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result = await self._complete_login(
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user_id,
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login_submission,
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create_non_existent_users=True,
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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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def _get_auth_flow_dict_for_idp(idp: SsoIdentityProvider) -> JsonDict:
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"""Return an entry for the login flow dict
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Returns an entry suitable for inclusion in "identity_providers" in the
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response to GET /_matrix/client/r0/login
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Args:
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idp: the identity provider to describe
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"""
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e: JsonDict = {"id": idp.idp_id, "name": idp.idp_name}
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if idp.idp_icon:
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e["icon"] = idp.idp_icon
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if idp.idp_brand:
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e["brand"] = idp.idp_brand
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return e
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class RefreshTokenServlet(RestServlet):
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PATTERNS = (re.compile("^/_matrix/client/v1/refresh$"),)
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def __init__(self, hs: "HomeServer"):
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self._auth_handler = hs.get_auth_handler()
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self._clock = hs.get_clock()
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self.refreshable_access_token_lifetime = (
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hs.config.registration.refreshable_access_token_lifetime
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)
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self.refresh_token_lifetime = hs.config.registration.refresh_token_lifetime
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async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
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refresh_submission = parse_json_object_from_request(request)
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assert_params_in_dict(refresh_submission, ["refresh_token"])
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token = refresh_submission["refresh_token"]
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if not isinstance(token, str):
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raise SynapseError(400, "Invalid param: refresh_token", Codes.INVALID_PARAM)
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now = self._clock.time_msec()
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access_valid_until_ms = None
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if self.refreshable_access_token_lifetime is not None:
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access_valid_until_ms = now + self.refreshable_access_token_lifetime
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refresh_valid_until_ms = None
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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()
|