diff options
Diffstat (limited to 'synapse/federation/federation_base.py')
| -rw-r--r-- | synapse/federation/federation_base.py | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py index 2bfe6a3d37..024e440ff4 100644 --- a/synapse/federation/federation_base.py +++ b/synapse/federation/federation_base.py @@ -178,6 +178,34 @@ async def _check_sigs_on_pdu( ) raise SynapseError(403, errmsg, Codes.FORBIDDEN) + # If this is a join event for a restricted room it may have been authorised + # via a different server from the sending server. Check those signatures. + if ( + room_version.msc3083_join_rules + and pdu.type == EventTypes.Member + and pdu.membership == Membership.JOIN + and "join_authorised_via_users_server" in pdu.content + ): + authorising_server = get_domain_from_id( + pdu.content["join_authorised_via_users_server"] + ) + try: + await keyring.verify_event_for_server( + authorising_server, + pdu, + pdu.origin_server_ts if room_version.enforce_key_validity else 0, + ) + except Exception as e: + errmsg = ( + "event id %s: unable to verify signature for authorising server %s: %s" + % ( + pdu.event_id, + authorising_server, + e, + ) + ) + raise SynapseError(403, errmsg, Codes.FORBIDDEN) + def _is_invite_via_3pid(event: EventBase) -> bool: return ( |