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Fix joining rooms you have been unbanned from (#15323)

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* Fix joining rooms you have been unbanned from

Since forever synapse did not allow you to join a room after you have
been unbanned from it over federation. This was not actually because of
the unban event not federating. Synapse simply used outdated state to
validate the join transition. This skips the validation if we are not in
the room and for that reason won't have the current room state.

Fixes #1563

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>

* Add changelog

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>

* Update changelog.d/15323.bugfix

---------

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>
This commit is contained in:
DeepBlueV7.X 2023-03-29 08:37:27 +00:00 committed by GitHub
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commit 753d1d9cde
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3 changed files with 63 additions and 57 deletions
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1
changelog.d/15323.bugfix Normal file
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@ -0,0 +1 @@
Fix a long-standing bug preventing users from joining rooms, that they had been unbanned from, over federation. Contributed by Nico.

2
synapse/handlers/federation_event.py
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@ -583,7 +583,7 @@ class FederationEventHandler:
await self._check_event_auth(origin, event, context)
if context.rejected:
raise SynapseError(400, "Join event was rejected")
raise SynapseError(403, "Join event was rejected")
# the remote server is responsible for sending our join event to the rest
# of the federation. Indeed, attempting to do so will result in problems

11
synapse/handlers/room_member.py
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@ -850,15 +850,22 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
# `is_partial_state_room` also indicates whether `partial_state_before_join` is
# partial.
is_host_in_room = await self._is_host_in_room(partial_state_before_join)
# if we are not in the room, we won't have the current state
if is_host_in_room:
# TODO: Refactor into dictionary of explicitly allowed transitions
# between old and new state, with specific error messages for some
# transitions and generic otherwise
old_state_id = partial_state_before_join.get(
(EventTypes.Member, target.to_string())
)
if old_state_id:
old_state = await self.store.get_event(old_state_id, allow_none=True)
old_membership = old_state.content.get("membership") if old_state else None
old_membership = (
old_state.content.get("membership") if old_state else None
)
if action == "unban" and old_membership != "ban":
raise SynapseError(
403,
@ -906,8 +913,6 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
if action == "kick":
raise AuthError(403, "The target user is not in the room")
is_host_in_room = await self._is_host_in_room(partial_state_before_join)
if effective_membership_state == Membership.JOIN:
if requester.is_guest:
guest_can_join = await self._can_guest_join(partial_state_before_join)