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-rw-r--r--synapse/__init__.py2
-rw-r--r--synapse/handlers/presence.py7
-rw-r--r--synapse/handlers/room.py10
-rw-r--r--synapse/handlers/typing.py9
-rw-r--r--synapse/rest/client/v1/room.py23
5 files changed, 43 insertions, 8 deletions
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 43bf78f885..523deaa5ff 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -16,4 +16,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.17.1"
+__version__ = "0.17.2"
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index da9f0da69e..7a3c16a8aa 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -651,6 +651,13 @@ class PresenceHandler(object):
                 )
                 continue
 
+            if get_domain_from_id(user_id) != origin:
+                logger.info(
+                    "Got presence update from %r with bad 'user_id': %r",
+                    origin, user_id,
+                )
+                continue
+
             presence_state = push.get("presence", None)
             if not presence_state:
                 logger.info(
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index bf6b1c1535..8758af4ca1 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -444,6 +444,16 @@ class RoomListHandler(BaseHandler):
         self.remote_list_cache = yield deferred
 
     @defer.inlineCallbacks
+    def get_remote_public_room_list(self, server_name):
+        res = yield self.hs.get_replication_layer().get_public_rooms(
+            [server_name]
+        )
+
+        if server_name not in res:
+            raise SynapseError(404, "Server not found")
+        defer.returnValue(res[server_name])
+
+    @defer.inlineCallbacks
     def get_aggregated_public_room_list(self):
         """
         Get the public room list from this server and the servers
diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index 0b530b9034..3b687957dd 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -199,7 +199,14 @@ class TypingHandler(object):
         user_id = content["user_id"]
 
         # Check that the string is a valid user id
-        UserID.from_string(user_id)
+        user = UserID.from_string(user_id)
+
+        if user.domain != origin:
+            logger.info(
+                "Got typing update from %r with bad 'user_id': %r",
+                origin, user_id,
+            )
+            return
 
         users = yield self.state.get_current_user_in_room(room_id)
         domains = set(get_domain_from_id(u) for u in users)
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 0d81757010..3c933f1620 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -23,7 +23,7 @@ from synapse.api.constants import EventTypes, Membership
 from synapse.api.filtering import Filter
 from synapse.types import UserID, RoomID, RoomAlias
 from synapse.events.utils import serialize_event
-from synapse.http.servlet import parse_json_object_from_request
+from synapse.http.servlet import parse_json_object_from_request, parse_string
 
 import logging
 import urllib
@@ -295,15 +295,26 @@ class PublicRoomListRestServlet(ClientV1RestServlet):
 
     @defer.inlineCallbacks
     def on_GET(self, request):
+        server = parse_string(request, "server", default=None)
+
         try:
             yield self.auth.get_user_by_req(request)
-        except AuthError:
-            # This endpoint isn't authed, but its useful to know who's hitting
-            # it if they *do* supply an access token
-            pass
+        except AuthError as e:
+            # We allow people to not be authed if they're just looking at our
+            # room list, but require auth when we proxy the request.
+            # In both cases we call the auth function, as that has the side
+            # effect of logging who issued this request if an access token was
+            # provided.
+            if server:
+                raise e
+            else:
+                pass
 
         handler = self.hs.get_room_list_handler()
-        data = yield handler.get_aggregated_public_room_list()
+        if server:
+            data = yield handler.get_remote_public_room_list(server)
+        else:
+            data = yield handler.get_aggregated_public_room_list()
 
         defer.returnValue((200, data))