diff options
Diffstat (limited to 'synapse/federation/federation_server.py')
| -rw-r--r-- | synapse/federation/federation_server.py | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index 29619aeeb8..2892a11d7d 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -45,6 +45,7 @@ from synapse.api.errors import ( UnsupportedRoomVersionError, ) from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion +from synapse.crypto.event_signing import compute_event_signature from synapse.events import EventBase from synapse.events.snapshot import EventContext from synapse.federation.federation_base import FederationBase, event_from_pdu_json @@ -64,7 +65,7 @@ from synapse.replication.http.federation import ( ReplicationGetQueryRestServlet, ) from synapse.storage.databases.main.lock import Lock -from synapse.types import JsonDict +from synapse.types import JsonDict, get_domain_from_id from synapse.util import glob_to_regex, json_decoder, unwrapFirstError from synapse.util.async_helpers import Linearizer, concurrently_execute from synapse.util.caches.response_cache import ResponseCache @@ -586,7 +587,7 @@ class FederationServer(FederationBase): async def on_send_join_request( self, origin: str, content: JsonDict, room_id: str ) -> Dict[str, Any]: - context = await self._on_send_membership_event( + event, context = await self._on_send_membership_event( origin, content, Membership.JOIN, room_id ) @@ -597,6 +598,7 @@ class FederationServer(FederationBase): time_now = self._clock.time_msec() return { + "org.matrix.msc3083.v2.event": event.get_pdu_json(), "state": [p.get_pdu_json(time_now) for p in state.values()], "auth_chain": [p.get_pdu_json(time_now) for p in auth_chain], } @@ -681,7 +683,7 @@ class FederationServer(FederationBase): Returns: The stripped room state. """ - event_context = await self._on_send_membership_event( + _, context = await self._on_send_membership_event( origin, content, Membership.KNOCK, room_id ) @@ -690,14 +692,14 @@ class FederationServer(FederationBase): # related to the room while the knock request is pending. stripped_room_state = ( await self.store.get_stripped_room_state_from_event_context( - event_context, self._room_prejoin_state_types + context, self._room_prejoin_state_types ) ) return {"knock_state_events": stripped_room_state} async def _on_send_membership_event( self, origin: str, content: JsonDict, membership_type: str, room_id: str - ) -> EventContext: + ) -> Tuple[EventBase, EventContext]: """Handle an on_send_{join,leave,knock} request Does some preliminary validation before passing the request on to the @@ -712,7 +714,7 @@ class FederationServer(FederationBase): in the event Returns: - The context of the event after inserting it into the room graph. + The event and context of the event after inserting it into the room graph. Raises: SynapseError if there is a problem with the request, including things like @@ -748,6 +750,33 @@ class FederationServer(FederationBase): logger.debug("_on_send_membership_event: pdu sigs: %s", event.signatures) + # Sign the event since we're vouching on behalf of the remote server that + # the event is valid to be sent into the room. Currently this is only done + # if the user is being joined via restricted join rules. + if ( + room_version.msc3083_join_rules + and event.membership == Membership.JOIN + and "join_authorised_via_users_server" in event.content + ): + # We can only authorise our own users. + authorising_server = get_domain_from_id( + event.content["join_authorised_via_users_server"] + ) + if authorising_server != self.server_name: + raise SynapseError( + 400, + f"Cannot authorise request from resident server: {authorising_server}", + ) + + event.signatures.update( + compute_event_signature( + room_version, + event.get_pdu_json(), + self.hs.hostname, + self.hs.signing_key, + ) + ) + event = await self._check_sigs_and_hash(room_version, event) return await self.handler.on_send_membership_event(origin, event) |