Merge pull request #3641 from matrix-org/rav/room_id_check

Validation for events/rooms in fed requests

1 files changed, 23 insertions, 6 deletions

diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 20fb46fc89..60391d07c4 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1349,6 +1349,11 @@ class FederationHandler(BaseHandler):
     def get_state_for_pdu(self, room_id, event_id):
         """Returns the state at the event. i.e. not including said event.
         """
+
+        event = yield self.store.get_event(
+            event_id, allow_none=False, check_room_id=room_id,
+        )
+
         state_groups = yield self.store.get_state_groups(
             room_id, [event_id]
         )
@@ -1359,8 +1364,7 @@ class FederationHandler(BaseHandler):
                 (e.type, e.state_key): e for e in state
             }
 
-            event = yield self.store.get_event(event_id)
-            if event and event.is_state():
+            if event.is_state():
                 # Get previous state
                 if "replaces_state" in event.unsigned:
                     prev_id = event.unsigned["replaces_state"]
@@ -1391,6 +1395,10 @@ class FederationHandler(BaseHandler):
     def get_state_ids_for_pdu(self, room_id, event_id):
         """Returns the state at the event. i.e. not including said event.
         """
+        event = yield self.store.get_event(
+            event_id, allow_none=False, check_room_id=room_id,
+        )
+
         state_groups = yield self.store.get_state_groups_ids(
             room_id, [event_id]
         )
@@ -1399,8 +1407,7 @@ class FederationHandler(BaseHandler):
             _, state = state_groups.items().pop()
             results = state
 
-            event = yield self.store.get_event(event_id)
-            if event and event.is_state():
+            if event.is_state():
                 # Get previous state
                 if "replaces_state" in event.unsigned:
                     prev_id = event.unsigned["replaces_state"]
@@ -1706,8 +1713,19 @@ class FederationHandler(BaseHandler):
         defer.returnValue(context)
 
     @defer.inlineCallbacks
-    def on_query_auth(self, origin, event_id, remote_auth_chain, rejects,
+    def on_query_auth(self, origin, event_id, room_id, remote_auth_chain, rejects,
                       missing):
+        in_room = yield self.auth.check_host_in_room(
+            room_id,
+            origin
+        )
+        if not in_room:
+            raise AuthError(403, "Host not in room.")
+
+        event = yield self.store.get_event(
+            event_id, allow_none=False, check_room_id=room_id
+        )
+
         # Just go through and process each event in `remote_auth_chain`. We
         # don't want to fall into the trap of `missing` being wrong.
         for e in remote_auth_chain:
@@ -1717,7 +1735,6 @@ class FederationHandler(BaseHandler):
                 pass
 
         # Now get the current auth_chain for the event.
-        event = yield self.store.get_event(event_id)
         local_auth_chain = yield self.store.get_auth_chain(
             [auth_id for auth_id, _ in event.auth_events],
             include_given=True