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Accept join events from all servers

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Make sure that we accept join events from any server, rather than just the
origin server, to make the federation join dance work correctly.

(Fixes #1893).
This commit is contained in:
Richard van der Hoff 2017-04-03 15:58:07 +01:00
parent 9ff4e0e91b
commit 30bcbf775a
2 changed files with 19 additions and 5 deletions
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8
synapse/federation/federation_server.py
View file

@ -146,11 +146,15 @@ class FederationServer(FederationBase):
# check that it's actually being sent from a valid destination to
# workaround bug #1753 in 0.18.5 and 0.18.6
if transaction.origin != get_domain_from_id(pdu.event_id):
# We continue to accept join events from any server; this is
# necessary for the federation join dance to work correctly.
# (When we join over federation, the "helper" server is
# responsible for sending out the join event, rather than the
# origin. See bug #1893).
if not (
pdu.type == 'm.room.member' and
pdu.content and
pdu.content.get("membership", None) == 'join' and
self.hs.is_mine_id(pdu.state_key)
pdu.content.get("membership", None) == 'join'
):
logger.info(
"Discarding PDU %s from invalid origin %s",

16
synapse/handlers/federation.py
View file

@ -1004,9 +1004,19 @@ class FederationHandler(BaseHandler):
)
event.internal_metadata.outlier = False
# Send this event on behalf of the origin server since they may not
# have an up to data view of the state of the room at this event so
# will not know which servers to send the event to.
# Send this event on behalf of the origin server.
#
# The reasons we have the destination server rather than the origin
# server send it are slightly mysterious: the origin server should have
# all the neccessary state once it gets the response to the send_join,
# so it could send the event itself if it wanted to. It may be that
# doing it this way reduces failure modes, or avoids certain attacks
# where a new server selectively tells a subset of the federation that
# it has joined.
#
# The fact is that, as of the current writing, Synapse doesn't send out
# the join event over federation after joining, and changing it now
# would introduce the danger of backwards-compatibility problems.
event.internal_metadata.send_on_behalf_of = origin
context, event_stream_id, max_stream_id = yield self._handle_new_event(