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Use event origin for filtering incoming events

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We only process events sent to us from a server if the event ID matches
the server, to help guard against federation storms. We replace this
with a check against the event origin.
This commit is contained in:
Erik Johnston 2019-01-29 16:26:40 +00:00
parent 55d9024835
commit 8e3d34e3c5
1 changed files with 7 additions and 4 deletions
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11
synapse/federation/federation_server.py
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@ -25,7 +25,7 @@ from twisted.internet import defer
from twisted.internet.abstract import isIPAddress
from twisted.python import failure
from synapse.api.constants import EventTypes
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import (
AuthError,
FederationError,
@ -620,16 +620,19 @@ 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 origin != get_domain_from_id(pdu.event_id):
if origin != get_domain_from_id(pdu.sender):
# 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).
# origin. See bug #1893. This is also true for some third party
# invites).
if not (
pdu.type == 'm.room.member' and
pdu.content and
pdu.content.get("membership", None) == 'join'
pdu.content.get("membership", None) in (
Membership.JOIN, Membership.INVITE,
)
):
logger.info(
"Discarding PDU %s from invalid origin %s",