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Ensure that we reject events which use rejected events for auth (#10956)

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When we consider whether to accept events, we should not accept those which
depend on rejected events for their auth events.

This (together with earlier changes such as
https://github.com/matrix-org/synapse/pull/10771 and
https://github.com/matrix-org/synapse/pull/10896) forms a partial fix to
https://github.com/matrix-org/synapse/issues/9595. There still remain code
paths where we do not check the `auth_events` at all.
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Richard van der Hoff 2021-10-05 13:23:29 +01:00 committed by GitHub
parent 787af4a106
commit 3a5b0cbe7a
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changelog.d/10956.bugfix Normal file
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@ -0,0 +1 @@
Fix a long-standing bug which meant that events received over federation were sometimes incorrectly accepted into the room state.

6
synapse/event_auth.py
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@ -155,6 +155,12 @@ def check_auth_rules_for_event(
"which is in room %s"
% (event.event_id, room_id, auth_event.event_id, auth_event.room_id),
)
if auth_event.rejected_reason:
raise AuthError(
403,
"During auth for event %s: found rejected event %s in the state"
% (event.event_id, auth_event.event_id),
)
# Implementation of https://matrix.org/docs/spec/rooms/v1#authorization-rules
#