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Merge pull request #4166 from matrix-org/erikj/drop_unknown_events

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Drop incoming events from federation for unknown rooms
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Erik Johnston 2018-11-09 17:59:34 +00:00 committed by GitHub
commit db5a1c059a
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3 changed files with 77 additions and 91 deletions
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1
changelog.d/4165.misc Normal file
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@ -0,0 +1 @@
Drop incoming events from federation for unknown rooms

24
synapse/federation/federation_server.py
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@ -162,8 +162,30 @@ class FederationServer(FederationBase):
p["age_ts"] = request_time - int(p["age"])
del p["age"]
# We try and pull out an event ID so that if later checks fail we
# can log something sensible. We don't mandate an event ID here in
# case future event formats get rid of the key.
possible_event_id = p.get("event_id", "<Unknown>")
# Now we get the room ID so that we can check that we know the
# version of the room.
room_id = p.get("room_id")
if not room_id:
logger.info(
"Ignoring PDU as does not have a room_id. Event ID: %s",
possible_event_id,
)
continue
try:
# In future we will actually use the room version to parse the
# PDU into an event.
yield self.store.get_room_version(room_id)
except NotFoundError:
logger.info("Ignoring PDU for unknown room_id: %s", room_id)
continue
event = event_from_pdu_json(p)
room_id = event.room_id
pdus_by_room.setdefault(room_id, []).append(event)
pdu_results = {}

49
synapse/handlers/federation.py
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@ -202,24 +202,19 @@ class FederationHandler(BaseHandler):
self.room_queues[room_id].append((pdu, origin))
return
# If we're no longer in the room just ditch the event entirely. This
# is probably an old server that has come back and thinks we're still
# in the room (or we've been rejoined to the room by a state reset).
# If we're not in the room just ditch the event entirely. This is
# probably an old server that has come back and thinks we're still in
# the room (or we've been rejoined to the room by a state reset).
#
# If we were never in the room then maybe our database got vaped and
# we should check if we *are* in fact in the room. If we are then we
# can magically rejoin the room.
# Note that if we were never in the room then we would have already
# dropped the event, since we wouldn't know the room version.
is_in_room = yield self.auth.check_host_in_room(
room_id,
self.server_name
)
if not is_in_room:
was_in_room = yield self.store.was_host_joined(
pdu.room_id, self.server_name,
)
if was_in_room:
logger.info(
"[%s %s] Ignoring PDU from %s as we've left the room",
"[%s %s] Ignoring PDU from %s as we're not in the room",
room_id, event_id, origin,
)
defer.returnValue(None)
@ -557,38 +552,6 @@ class FederationHandler(BaseHandler):
room_id, event_id, event,
)
# FIXME (erikj): Awful hack to make the case where we are not currently
# in the room work
# If state and auth_chain are None, then we don't need to do this check
# as we already know we have enough state in the DB to handle this
# event.
if state and auth_chain and not event.internal_metadata.is_outlier():
is_in_room = yield self.auth.check_host_in_room(
room_id,
self.server_name
)
else:
is_in_room = True
if not is_in_room:
logger.info(
"[%s %s] Got event for room we're not in",
room_id, event_id,
)
try:
yield self._persist_auth_tree(
origin, auth_chain, state, event
)
except AuthError as e:
raise FederationError(
"ERROR",
e.code,
e.msg,
affected=event_id,
)
else:
event_ids = set()
if state:
event_ids |= {e.event_id for e in state}