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Only do restricted join rules signature checks for room versions 8/9. (#10927)

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Otherwise the presence of a (bogus, unused) field could cause
auth checks to fail.
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Patrick Cloke 2021-09-28 08:44:19 -04:00 committed by GitHub
parent a8bbf08576
commit c3ccad7785
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2 changed files with 3 additions and 1 deletions
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1
changelog.d/10927.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug introduced in Synapse v1.40.0 where the signature checks for room version 8/9 could be applied to earlier room versions in some situations.

3
synapse/event_auth.py
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@ -113,7 +113,8 @@ def check(
raise AuthError(403, "Event not signed by sending server")
is_invite_via_allow_rule = (
event.type == EventTypes.Member
room_version_obj.msc3083_join_rules
and event.type == EventTypes.Member
and event.membership == Membership.JOIN
and "join_authorised_via_users_server" in event.content
)