Synapse vulnerable to leak of remote user device information

@@ -84,7 +84,7 @@
 from synapse.storage.databases.main.lock import Lock
 from synapse.storage.databases.main.roommember import extract_heroes_from_room_summary
 from synapse.storage.roommember import MemberSummary
-from synapse.types import JsonDict, StateMap, get_domain_from_id
+from synapse.types import JsonDict, StateMap, get_domain_from_id, UserID
 from synapse.util import unwrapFirstError
 from synapse.util.async_helpers import Linearizer, concurrently_execute, gather_results
 from synapse.util.caches.response_cache import ResponseCache
@@ -999,6 +999,12 @@ async def on_query_user_devices(
     async def on_claim_client_keys(
         self, query: List[Tuple[str, str, str, int]], always_include_fallback_keys: bool
     ) -> Dict[str, Any]:
+        if any(
+            not self.hs.is_mine(UserID.from_string(user_id))
+            for user_id, _, _, _ in query
+        ):
+            raise SynapseError(400, "User is not hosted on this homeserver")
+
         log_kv({"message": "Claiming one time keys.", "user, device pairs": query})
         results = await self._e2e_keys_handler.claim_local_one_time_keys(
             query, always_include_fallback_keys=always_include_fallback_keys

@@ -328,6 +328,9 @@ async def get_user_ids_changed(
         return result
 
     async def on_federation_query_user_devices(self, user_id: str) -> JsonDict:
+        if not self.hs.is_mine(UserID.from_string(user_id)):
+            raise SynapseError(400, "User is not hosted on this homeserver")
+
         stream_id, devices = await self.store.get_e2e_device_keys_for_federation_query(
             user_id
         )

@@ -542,6 +542,12 @@ async def on_federation_query_client_keys(
         device_keys_query: Dict[str, Optional[List[str]]] = query_body.get(
             "device_keys", {}
         )
+        if any(
+            not self.is_mine(UserID.from_string(user_id))
+            for user_id in device_keys_query
+        ):
+            raise SynapseError(400, "User is not hosted on this homeserver")
+
         res = await self.query_local_devices(
             device_keys_query,
             include_displaynames=(