diff options
Diffstat (limited to 'synapse/event_auth.py')
| -rw-r--r-- | synapse/event_auth.py | 77 |
1 files changed, 61 insertions, 16 deletions
diff --git a/synapse/event_auth.py b/synapse/event_auth.py index 137dff2513..cc92d35477 100644 --- a/synapse/event_auth.py +++ b/synapse/event_auth.py @@ -106,6 +106,18 @@ def check( if not event.signatures.get(event_id_domain): raise AuthError(403, "Event not signed by sending server") + is_invite_via_allow_rule = ( + event.type == EventTypes.Member + and event.membership == Membership.JOIN + and "join_authorised_via_users_server" in event.content + ) + if is_invite_via_allow_rule: + authoriser_domain = get_domain_from_id( + event.content["join_authorised_via_users_server"] + ) + if not event.signatures.get(authoriser_domain): + raise AuthError(403, "Event not signed by authorising server") + # Implementation of https://matrix.org/docs/spec/rooms/v1#authorization-rules # # 1. If type is m.room.create: @@ -177,7 +189,7 @@ def check( # https://github.com/vector-im/vector-web/issues/1208 hopefully if event.type == EventTypes.ThirdPartyInvite: user_level = get_user_power_level(event.user_id, auth_events) - invite_level = _get_named_level(auth_events, "invite", 0) + invite_level = get_named_level(auth_events, "invite", 0) if user_level < invite_level: raise AuthError(403, "You don't have permission to invite users") @@ -285,8 +297,8 @@ def _is_membership_change_allowed( user_level = get_user_power_level(event.user_id, auth_events) target_level = get_user_power_level(target_user_id, auth_events) - # FIXME (erikj): What should we do here as the default? - ban_level = _get_named_level(auth_events, "ban", 50) + invite_level = get_named_level(auth_events, "invite", 0) + ban_level = get_named_level(auth_events, "ban", 50) logger.debug( "_is_membership_change_allowed: %s", @@ -336,8 +348,6 @@ def _is_membership_change_allowed( elif target_in_room: # the target is already in the room. raise AuthError(403, "%s is already in the room." % target_user_id) else: - invite_level = _get_named_level(auth_events, "invite", 0) - if user_level < invite_level: raise AuthError(403, "You don't have permission to invite users") elif Membership.JOIN == membership: @@ -345,16 +355,41 @@ def _is_membership_change_allowed( # * They are not banned. # * They are accepting a previously sent invitation. # * They are already joined (it's a NOOP). - # * The room is public or restricted. + # * The room is public. + # * The room is restricted and the user meets the allows rules. if event.user_id != target_user_id: raise AuthError(403, "Cannot force another user to join.") elif target_banned: raise AuthError(403, "You are banned from this room") - elif join_rule == JoinRules.PUBLIC or ( + elif join_rule == JoinRules.PUBLIC: + pass + elif ( room_version.msc3083_join_rules and join_rule == JoinRules.MSC3083_RESTRICTED ): - pass + # This is the same as public, but the event must contain a reference + # to the server who authorised the join. If the event does not contain + # the proper content it is rejected. + # + # Note that if the caller is in the room or invited, then they do + # not need to meet the allow rules. + if not caller_in_room and not caller_invited: + authorising_user = event.content.get("join_authorised_via_users_server") + + if authorising_user is None: + raise AuthError(403, "Join event is missing authorising user.") + + # The authorising user must be in the room. + key = (EventTypes.Member, authorising_user) + member_event = auth_events.get(key) + _check_joined_room(member_event, authorising_user, event.room_id) + + authorising_user_level = get_user_power_level( + authorising_user, auth_events + ) + if authorising_user_level < invite_level: + raise AuthError(403, "Join event authorised by invalid server.") + elif join_rule == JoinRules.INVITE or ( room_version.msc2403_knocking and join_rule == JoinRules.KNOCK ): @@ -369,7 +404,7 @@ def _is_membership_change_allowed( if target_banned and user_level < ban_level: raise AuthError(403, "You cannot unban user %s." % (target_user_id,)) elif target_user_id != event.user_id: - kick_level = _get_named_level(auth_events, "kick", 50) + kick_level = get_named_level(auth_events, "kick", 50) if user_level < kick_level or user_level <= target_level: raise AuthError(403, "You cannot kick user %s." % target_user_id) @@ -445,7 +480,7 @@ def get_send_level( def _can_send_event(event: EventBase, auth_events: StateMap[EventBase]) -> bool: - power_levels_event = _get_power_level_event(auth_events) + power_levels_event = get_power_level_event(auth_events) send_level = get_send_level(event.type, event.get("state_key"), power_levels_event) user_level = get_user_power_level(event.user_id, auth_events) @@ -485,7 +520,7 @@ def check_redaction( """ user_level = get_user_power_level(event.user_id, auth_events) - redact_level = _get_named_level(auth_events, "redact", 50) + redact_level = get_named_level(auth_events, "redact", 50) if user_level >= redact_level: return False @@ -600,7 +635,7 @@ def _check_power_levels( ) -def _get_power_level_event(auth_events: StateMap[EventBase]) -> Optional[EventBase]: +def get_power_level_event(auth_events: StateMap[EventBase]) -> Optional[EventBase]: return auth_events.get((EventTypes.PowerLevels, "")) @@ -616,7 +651,7 @@ def get_user_power_level(user_id: str, auth_events: StateMap[EventBase]) -> int: Returns: the user's power level in this room. """ - power_level_event = _get_power_level_event(auth_events) + power_level_event = get_power_level_event(auth_events) if power_level_event: level = power_level_event.content.get("users", {}).get(user_id) if not level: @@ -640,8 +675,8 @@ def get_user_power_level(user_id: str, auth_events: StateMap[EventBase]) -> int: return 0 -def _get_named_level(auth_events: StateMap[EventBase], name: str, default: int) -> int: - power_level_event = _get_power_level_event(auth_events) +def get_named_level(auth_events: StateMap[EventBase], name: str, default: int) -> int: + power_level_event = get_power_level_event(auth_events) if not power_level_event: return default @@ -728,7 +763,9 @@ def get_public_keys(invite_event: EventBase) -> List[Dict[str, Any]]: return public_keys -def auth_types_for_event(event: Union[EventBase, EventBuilder]) -> Set[Tuple[str, str]]: +def auth_types_for_event( + room_version: RoomVersion, event: Union[EventBase, EventBuilder] +) -> Set[Tuple[str, str]]: """Given an event, return a list of (EventType, StateKey) that may be needed to auth the event. The returned list may be a superset of what would actually be required depending on the full state of the room. @@ -760,4 +797,12 @@ def auth_types_for_event(event: Union[EventBase, EventBuilder]) -> Set[Tuple[str ) auth_types.add(key) + if room_version.msc3083_join_rules and membership == Membership.JOIN: + if "join_authorised_via_users_server" in event.content: + key = ( + EventTypes.Member, + event.content["join_authorised_via_users_server"], + ) + auth_types.add(key) + return auth_types |