diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index 016d5678e5..3240e8a7b2 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -100,7 +100,12 @@ def check(
if not event.signatures.get(event_id_domain):
raise AuthError(403, "Event not signed by sending server")
+ # Implementation of https://matrix.org/docs/spec/rooms/v1#authorization-rules
+ #
+ # 1. If type is m.room.create:
if event.type == EventTypes.Create:
+ # 1b. If the domain of the room_id does not match the domain of the sender,
+ # reject.
sender_domain = get_domain_from_id(event.sender)
room_id_domain = get_domain_from_id(event.room_id)
if room_id_domain != sender_domain:
@@ -108,40 +113,49 @@ def check(
403, "Creation event's room_id domain does not match sender's"
)
+ # 1c. If content.room_version is present and is not a recognised version, reject
room_version_prop = event.content.get("room_version", "1")
if room_version_prop not in KNOWN_ROOM_VERSIONS:
raise AuthError(
403,
"room appears to have unsupported version %s" % (room_version_prop,),
)
- # FIXME
+
logger.debug("Allowing! %s", event)
return
+ # 3. If event does not have a m.room.create in its auth_events, reject.
creation_event = auth_events.get((EventTypes.Create, ""), None)
-
if not creation_event:
raise AuthError(403, "No create event in auth events")
+ # additional check for m.federate
creating_domain = get_domain_from_id(event.room_id)
originating_domain = get_domain_from_id(event.sender)
if creating_domain != originating_domain:
if not _can_federate(event, auth_events):
raise AuthError(403, "This room has been marked as unfederatable.")
- # FIXME: Temp hack
+ # 4. If type is m.room.aliases
if event.type == EventTypes.Aliases:
+ # 4a. If event has no state_key, reject
if not event.is_state():
raise AuthError(403, "Alias event must be a state event")
if not event.state_key:
raise AuthError(403, "Alias event must have non-empty state_key")
+
+ # 4b. If sender's domain doesn't matches [sic] state_key, reject
sender_domain = get_domain_from_id(event.sender)
if event.state_key != sender_domain:
raise AuthError(
403, "Alias event's state_key does not match sender's domain"
)
- logger.debug("Allowing! %s", event)
- return
+
+ # 4c. Otherwise, allow.
+ # This is removed by https://github.com/matrix-org/matrix-doc/pull/2260
+ if room_version.special_case_aliases_auth:
+ logger.debug("Allowing! %s", event)
+ return
if logger.isEnabledFor(logging.DEBUG):
logger.debug("Auth events: %s", [a.event_id for a in auth_events.values()])
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