diff options
| -rw-r--r-- | changelog.d/6472.bugfix | 1 | ||||
| -rw-r--r-- | synapse/handlers/federation.py | 34 |
2 files changed, 26 insertions, 9 deletions
diff --git a/changelog.d/6472.bugfix b/changelog.d/6472.bugfix new file mode 100644 index 0000000000..598efb79fc --- /dev/null +++ b/changelog.d/6472.bugfix @@ -0,0 +1 @@ +Improve sanity-checking when receiving events over federation. diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py index 7784b80b77..f5d04cdf91 100644 --- a/synapse/handlers/federation.py +++ b/synapse/handlers/federation.py @@ -2195,21 +2195,37 @@ class FederationHandler(BaseHandler): different_auth, ) - # now we state-resolve between our own idea of the auth events, and the remote's - # idea of them. - - room_version = yield self.store.get_room_version(event.room_id) - # XXX: currently this checks for redactions but I'm not convinced that is # necessary? different_events = yield self.store.get_events_as_list(different_auth) - local_view = dict(auth_events) - remote_view = dict(auth_events) - remote_view.update({(d.type, d.state_key): d for d in different_events}) + for d in different_events: + if d.room_id != event.room_id: + logger.warning( + "Event %s refers to auth_event %s which is in a different room", + event.event_id, + d.event_id, + ) + + # don't attempt to resolve the claimed auth events against our own + # in this case: just use our own auth events. + # + # XXX: should we reject the event in this case? It feels like we should, + # but then shouldn't we also do so if we've failed to fetch any of the + # auth events? + return context + # now we state-resolve between our own idea of the auth events, and the remote's + # idea of them. + + local_state = auth_events.values() + remote_auth_events = dict(auth_events) + remote_auth_events.update({(d.type, d.state_key): d for d in different_events}) + remote_state = remote_auth_events.values() + + room_version = yield self.store.get_room_version(event.room_id) new_state = yield self.state_handler.resolve_events( - room_version, [list(local_view.values()), list(remote_view.values())], event + room_version, (local_state, remote_state), event ) logger.info( |