diff options
Diffstat (limited to 'synapse/api/auth.py')
| -rw-r--r-- | synapse/api/auth.py | 86 |
1 files changed, 72 insertions, 14 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py index 44883c6663..0bf58dff08 100644 --- a/synapse/api/auth.py +++ b/synapse/api/auth.py @@ -155,7 +155,11 @@ class Auth: access_token = self.get_access_token_from_request(request) - user_id, app_service = await self._get_appservice_user_id(request) + ( + user_id, + device_id, + app_service, + ) = await self._get_appservice_user_id_and_device_id(request) if user_id and app_service: if ip_addr and self._track_appservice_user_ips: await self.store.insert_client_ip( @@ -163,16 +167,22 @@ class Auth: access_token=access_token, ip=ip_addr, user_agent=user_agent, - device_id="dummy-device", # stubbed + device_id="dummy-device" + if device_id is None + else device_id, # stubbed ) - requester = create_requester(user_id, app_service=app_service) + requester = create_requester( + user_id, app_service=app_service, device_id=device_id + ) request.requester = user_id if user_id in self._force_tracing_for_users: opentracing.force_tracing() opentracing.set_tag("authenticated_entity", user_id) opentracing.set_tag("user_id", user_id) + if device_id is not None: + opentracing.set_tag("device_id", device_id) opentracing.set_tag("appservice_id", app_service.id) return requester @@ -274,33 +284,81 @@ class Auth: 403, "Application service has not registered this user (%s)" % user_id ) - async def _get_appservice_user_id( + async def _get_appservice_user_id_and_device_id( self, request: Request - ) -> Tuple[Optional[str], Optional[ApplicationService]]: + ) -> Tuple[Optional[str], Optional[str], Optional[ApplicationService]]: + """ + Given a request, reads the request parameters to determine: + - whether it's an application service that's making this request + - what user the application service should be treated as controlling + (the user_id URI parameter allows an application service to masquerade + any applicable user in its namespace) + - what device the application service should be treated as controlling + (the device_id[^1] URI parameter allows an application service to masquerade + as any device that exists for the relevant user) + + [^1] Unstable and provided by MSC3202. + Must use `org.matrix.msc3202.device_id` in place of `device_id` for now. + + Returns: + 3-tuple of + (user ID?, device ID?, application service?) + + Postconditions: + - If an application service is returned, so is a user ID + - A user ID is never returned without an application service + - A device ID is never returned without a user ID or an application service + - The returned application service, if present, is permitted to control the + returned user ID. + - The returned device ID, if present, has been checked to be a valid device ID + for the returned user ID. + """ + DEVICE_ID_ARG_NAME = b"org.matrix.msc3202.device_id" + app_service = self.store.get_app_service_by_token( self.get_access_token_from_request(request) ) if app_service is None: - return None, None + return None, None, None if app_service.ip_range_whitelist: ip_address = IPAddress(request.getClientIP()) if ip_address not in app_service.ip_range_whitelist: - return None, None + return None, None, None # This will always be set by the time Twisted calls us. assert request.args is not None - if b"user_id" not in request.args: - return app_service.sender, app_service + if b"user_id" in request.args: + effective_user_id = request.args[b"user_id"][0].decode("utf8") + await self.validate_appservice_can_control_user_id( + app_service, effective_user_id + ) + else: + effective_user_id = app_service.sender - user_id = request.args[b"user_id"][0].decode("utf8") - await self.validate_appservice_can_control_user_id(app_service, user_id) + effective_device_id: Optional[str] = None - if app_service.sender == user_id: - return app_service.sender, app_service + if ( + self.hs.config.experimental.msc3202_device_masquerading_enabled + and DEVICE_ID_ARG_NAME in request.args + ): + effective_device_id = request.args[DEVICE_ID_ARG_NAME][0].decode("utf8") + # We only just set this so it can't be None! + assert effective_device_id is not None + device_opt = await self.store.get_device( + effective_user_id, effective_device_id + ) + if device_opt is None: + # For now, use 400 M_EXCLUSIVE if the device doesn't exist. + # This is an open thread of discussion on MSC3202 as of 2021-12-09. + raise AuthError( + 400, + f"Application service trying to use a device that doesn't exist ('{effective_device_id}' for {effective_user_id})", + Codes.EXCLUSIVE, + ) - return user_id, app_service + return effective_user_id, effective_device_id, app_service async def get_user_by_access_token( self, |