diff options
Diffstat (limited to '')
| -rw-r--r-- | synapse/handlers/federation.py | 212 |
1 files changed, 142 insertions, 70 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py index fe1d83f6b8..0c9bdf51a4 100644 --- a/synapse/handlers/federation.py +++ b/synapse/handlers/federation.py @@ -103,7 +103,7 @@ logger = logging.getLogger(__name__) @attr.s(slots=True) class _NewEventInfo: - """Holds information about a received event, ready for passing to _handle_new_events + """Holds information about a received event, ready for passing to _auth_and_persist_events Attributes: event: the received event @@ -146,6 +146,7 @@ class FederationHandler(BaseHandler): self.is_mine_id = hs.is_mine_id self.spam_checker = hs.get_spam_checker() self.event_creation_handler = hs.get_event_creation_handler() + self.event_auth_handler = hs.get_event_auth_handler() self._message_handler = hs.get_message_handler() self._server_notices_mxid = hs.config.server_notices_mxid self.config = hs.config @@ -807,7 +808,10 @@ class FederationHandler(BaseHandler): logger.debug("Processing event: %s", event) try: - await self._handle_new_event(origin, event, state=state) + context = await self.state_handler.compute_event_context( + event, old_state=state + ) + await self._auth_and_persist_event(origin, event, context, state=state) except AuthError as e: raise FederationError("ERROR", e.code, e.msg, affected=event.event_id) @@ -1010,7 +1014,9 @@ class FederationHandler(BaseHandler): ) if ev_infos: - await self._handle_new_events(dest, room_id, ev_infos, backfilled=True) + await self._auth_and_persist_events( + dest, room_id, ev_infos, backfilled=True + ) # Step 2: Persist the rest of the events in the chunk one by one events.sort(key=lambda e: e.depth) @@ -1023,10 +1029,12 @@ class FederationHandler(BaseHandler): # non-outliers assert not event.internal_metadata.is_outlier() + context = await self.state_handler.compute_event_context(event) + # We store these one at a time since each event depends on the # previous to work out the state. # TODO: We can probably do something more clever here. - await self._handle_new_event(dest, event, backfilled=True) + await self._auth_and_persist_event(dest, event, context, backfilled=True) return events @@ -1360,7 +1368,7 @@ class FederationHandler(BaseHandler): event_infos.append(_NewEventInfo(event, None, auth)) - await self._handle_new_events( + await self._auth_and_persist_events( destination, room_id, event_infos, @@ -1666,16 +1674,47 @@ class FederationHandler(BaseHandler): # would introduce the danger of backwards-compatibility problems. event.internal_metadata.send_on_behalf_of = origin - context = await self._handle_new_event(origin, event) + # Calculate the event context. + context = await self.state_handler.compute_event_context(event) + + # Get the state before the new event. + prev_state_ids = await context.get_prev_state_ids() + + # Check if the user is already in the room or invited to the room. + user_id = event.state_key + prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), None) + newly_joined = True + is_invite = False + if prev_member_event_id: + prev_member_event = await self.store.get_event(prev_member_event_id) + newly_joined = prev_member_event.membership != Membership.JOIN + is_invite = prev_member_event.membership == Membership.INVITE + + # If the member is not already in the room, and not invited, check if + # they should be allowed access via membership in a space. + if ( + newly_joined + and not is_invite + and not await self.event_auth_handler.can_join_without_invite( + prev_state_ids, + event.room_version, + user_id, + ) + ): + raise SynapseError( + 400, + "You do not belong to any of the required spaces to join this room.", + ) + + # Persist the event. + await self._auth_and_persist_event(origin, event, context) logger.debug( - "on_send_join_request: After _handle_new_event: %s, sigs: %s", + "on_send_join_request: After _auth_and_persist_event: %s, sigs: %s", event.event_id, event.signatures, ) - prev_state_ids = await context.get_prev_state_ids() - state_ids = list(prev_state_ids.values()) auth_chain = await self.store.get_auth_chain(event.room_id, state_ids) @@ -1878,10 +1917,11 @@ class FederationHandler(BaseHandler): event.internal_metadata.outlier = False - await self._handle_new_event(origin, event) + context = await self.state_handler.compute_event_context(event) + await self._auth_and_persist_event(origin, event, context) logger.debug( - "on_send_leave_request: After _handle_new_event: %s, sigs: %s", + "on_send_leave_request: After _auth_and_persist_event: %s, sigs: %s", event.event_id, event.signatures, ) @@ -1989,16 +2029,44 @@ class FederationHandler(BaseHandler): async def get_min_depth_for_context(self, context: str) -> int: return await self.store.get_min_depth(context) - async def _handle_new_event( + async def _auth_and_persist_event( self, origin: str, event: EventBase, + context: EventContext, state: Optional[Iterable[EventBase]] = None, auth_events: Optional[MutableStateMap[EventBase]] = None, backfilled: bool = False, - ) -> EventContext: - context = await self._prep_event( - origin, event, state=state, auth_events=auth_events, backfilled=backfilled + ) -> None: + """ + Process an event by performing auth checks and then persisting to the database. + + Args: + origin: The host the event originates from. + event: The event itself. + context: + The event context. + + NB that this function potentially modifies it. + state: + The state events used to auth the event. If this is not provided + the current state events will be used. + auth_events: + Map from (event_type, state_key) to event + + Normally, our calculated auth_events based on the state of the room + at the event's position in the DAG, though occasionally (eg if the + event is an outlier), may be the auth events claimed by the remote + server. + backfilled: True if the event was backfilled. + """ + context = await self._check_event_auth( + origin, + event, + context, + state=state, + auth_events=auth_events, + backfilled=backfilled, ) try: @@ -2020,9 +2088,7 @@ class FederationHandler(BaseHandler): ) raise - return context - - async def _handle_new_events( + async def _auth_and_persist_events( self, origin: str, room_id: str, @@ -2040,9 +2106,13 @@ class FederationHandler(BaseHandler): async def prep(ev_info: _NewEventInfo): event = ev_info.event with nested_logging_context(suffix=event.event_id): - res = await self._prep_event( + res = await self.state_handler.compute_event_context( + event, old_state=ev_info.state + ) + res = await self._check_event_auth( origin, event, + res, state=ev_info.state, auth_events=ev_info.auth_events, backfilled=backfilled, @@ -2177,49 +2247,6 @@ class FederationHandler(BaseHandler): room_id, [(event, new_event_context)] ) - async def _prep_event( - self, - origin: str, - event: EventBase, - state: Optional[Iterable[EventBase]], - auth_events: Optional[MutableStateMap[EventBase]], - backfilled: bool, - ) -> EventContext: - context = await self.state_handler.compute_event_context(event, old_state=state) - - if not auth_events: - prev_state_ids = await context.get_prev_state_ids() - auth_events_ids = self.auth.compute_auth_events( - event, prev_state_ids, for_verification=True - ) - auth_events_x = await self.store.get_events(auth_events_ids) - auth_events = {(e.type, e.state_key): e for e in auth_events_x.values()} - - # This is a hack to fix some old rooms where the initial join event - # didn't reference the create event in its auth events. - if event.type == EventTypes.Member and not event.auth_event_ids(): - if len(event.prev_event_ids()) == 1 and event.depth < 5: - c = await self.store.get_event( - event.prev_event_ids()[0], allow_none=True - ) - if c and c.type == EventTypes.Create: - auth_events[(c.type, c.state_key)] = c - - context = await self.do_auth(origin, event, context, auth_events=auth_events) - - if not context.rejected: - await self._check_for_soft_fail(event, state, backfilled) - - if event.type == EventTypes.GuestAccess and not context.rejected: - await self.maybe_kick_guest_users(event) - - # If we are going to send this event over federation we precaclculate - # the joined hosts. - if event.internal_metadata.get_send_on_behalf_of(): - await self.event_creation_handler.cache_joined_hosts_for_event(event) - - return context - async def _check_for_soft_fail( self, event: EventBase, state: Optional[Iterable[EventBase]], backfilled: bool ) -> None: @@ -2330,19 +2357,28 @@ class FederationHandler(BaseHandler): return missing_events - async def do_auth( + async def _check_event_auth( self, origin: str, event: EventBase, context: EventContext, - auth_events: MutableStateMap[EventBase], + state: Optional[Iterable[EventBase]], + auth_events: Optional[MutableStateMap[EventBase]], + backfilled: bool, ) -> EventContext: """ + Checks whether an event should be rejected (for failing auth checks). Args: - origin: - event: + origin: The host the event originates from. + event: The event itself. context: + The event context. + + NB that this function potentially modifies it. + state: + The state events used to auth the event. If this is not provided + the current state events will be used. auth_events: Map from (event_type, state_key) to event @@ -2352,12 +2388,32 @@ class FederationHandler(BaseHandler): server. Also NB that this function adds entries to it. + backfilled: True if the event was backfilled. + Returns: - updated context object + The updated context object. """ room_version = await self.store.get_room_version_id(event.room_id) room_version_obj = KNOWN_ROOM_VERSIONS[room_version] + if not auth_events: + prev_state_ids = await context.get_prev_state_ids() + auth_events_ids = self.auth.compute_auth_events( + event, prev_state_ids, for_verification=True + ) + auth_events_x = await self.store.get_events(auth_events_ids) + auth_events = {(e.type, e.state_key): e for e in auth_events_x.values()} + + # This is a hack to fix some old rooms where the initial join event + # didn't reference the create event in its auth events. + if event.type == EventTypes.Member and not event.auth_event_ids(): + if len(event.prev_event_ids()) == 1 and event.depth < 5: + c = await self.store.get_event( + event.prev_event_ids()[0], allow_none=True + ) + if c and c.type == EventTypes.Create: + auth_events[(c.type, c.state_key)] = c + try: context = await self._update_auth_events_and_context_for_auth( origin, event, context, auth_events @@ -2379,6 +2435,17 @@ class FederationHandler(BaseHandler): logger.warning("Failed auth resolution for %r because %s", event, e) context.rejected = RejectedReason.AUTH_ERROR + if not context.rejected: + await self._check_for_soft_fail(event, state, backfilled) + + if event.type == EventTypes.GuestAccess and not context.rejected: + await self.maybe_kick_guest_users(event) + + # If we are going to send this event over federation we precaclculate + # the joined hosts. + if event.internal_metadata.get_send_on_behalf_of(): + await self.event_creation_handler.cache_joined_hosts_for_event(event) + return context async def _update_auth_events_and_context_for_auth( @@ -2388,7 +2455,7 @@ class FederationHandler(BaseHandler): context: EventContext, auth_events: MutableStateMap[EventBase], ) -> EventContext: - """Helper for do_auth. See there for docs. + """Helper for _check_event_auth. See there for docs. Checks whether a given event has the expected auth events. If it doesn't then we talk to the remote server to compare state to see if @@ -2468,9 +2535,14 @@ class FederationHandler(BaseHandler): e.internal_metadata.outlier = True logger.debug( - "do_auth %s missing_auth: %s", event.event_id, e.event_id + "_check_event_auth %s missing_auth: %s", + event.event_id, + e.event_id, + ) + context = await self.state_handler.compute_event_context(e) + await self._auth_and_persist_event( + origin, e, context, auth_events=auth ) - await self._handle_new_event(origin, e, auth_events=auth) if e.event_id in event_auth_events: auth_events[(e.type, e.state_key)] = e |