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Sanity-check the rooms of auth events before pulling them in. (#6472)

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Richard van der Hoff 2019-12-05 14:14:45 +00:00 committed by GitHub
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commit e1f4c83f41
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2 changed files with 26 additions and 9 deletions
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changelog.d/6472.bugfix Normal file
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@ -0,0 +1 @@
Improve sanity-checking when receiving events over federation.

34
synapse/handlers/federation.py
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@ -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(