From 0d63d93ca834771324f0c5b9340346ad2113a4b1 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Wed, 25 Jul 2018 22:25:41 +0100 Subject: Enforce compatibility when processing make_join requests Reject make_join requests from servers which do not support the room version. Also include the room version in the response. --- synapse/api/errors.py | 22 ++++++++++++++++++++++ synapse/federation/federation_server.py | 21 ++++++++++++++++++--- synapse/federation/transport/server.py | 24 +++++++++++++++++++++++- 3 files changed, 63 insertions(+), 4 deletions(-) diff --git a/synapse/api/errors.py b/synapse/api/errors.py index 477ca07a24..70400347bc 100644 --- a/synapse/api/errors.py +++ b/synapse/api/errors.py @@ -58,6 +58,7 @@ class Codes(object): CANNOT_LEAVE_SERVER_NOTICE_ROOM = "M_CANNOT_LEAVE_SERVER_NOTICE_ROOM" MAU_LIMIT_EXCEEDED = "M_MAU_LIMIT_EXCEEDED" UNSUPPORTED_ROOM_VERSION = "M_UNSUPPORTED_ROOM_VERSION" + INCOMPATIBLE_ROOM_VERSION = "M_INCOMPATIBLE_ROOM_VERSION" class CodeMessageException(RuntimeError): @@ -287,6 +288,27 @@ class LimitExceededError(SynapseError): ) +class IncompatibleRoomVersionError(SynapseError): + """A server is trying to join a room whose version it does not support.""" + + def __init__(self, room_version): + super(IncompatibleRoomVersionError, self).__init__( + code=400, + msg="Your homeserver does not support the features required to " + "join this room", + errcode=Codes.INCOMPATIBLE_ROOM_VERSION, + ) + + self._room_version = room_version + + def error_dict(self): + return cs_error( + self.msg, + self.errcode, + room_version=self._room_version, + ) + + def cs_error(msg, code=Codes.UNKNOWN, **kwargs): """ Utility method for constructing an error response for client-server interactions. diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index bf89d568af..2b62f687b6 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -27,7 +27,13 @@ from twisted.internet.abstract import isIPAddress from twisted.python import failure from synapse.api.constants import EventTypes -from synapse.api.errors import AuthError, FederationError, NotFoundError, SynapseError +from synapse.api.errors import ( + AuthError, + FederationError, + IncompatibleRoomVersionError, + NotFoundError, + SynapseError, +) from synapse.crypto.event_signing import compute_event_signature from synapse.federation.federation_base import FederationBase, event_from_pdu_json from synapse.federation.persistence import TransactionActions @@ -323,12 +329,21 @@ class FederationServer(FederationBase): defer.returnValue((200, resp)) @defer.inlineCallbacks - def on_make_join_request(self, origin, room_id, user_id): + def on_make_join_request(self, origin, room_id, user_id, supported_versions): origin_host, _ = parse_server_name(origin) yield self.check_server_matches_acl(origin_host, room_id) + + room_version = yield self.store.get_room_version(room_id) + if room_version not in supported_versions: + logger.warn("Room version %s not in %s", room_version, supported_versions) + raise IncompatibleRoomVersionError(room_version=room_version) + pdu = yield self.handler.on_make_join_request(room_id, user_id) time_now = self._clock.time_msec() - defer.returnValue({"event": pdu.get_pdu_json(time_now)}) + defer.returnValue({ + "event": pdu.get_pdu_json(time_now), + "room_version": room_version, + }) @defer.inlineCallbacks def on_invite_request(self, origin, content): diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index 93bd899b86..77969a4f38 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -431,9 +431,31 @@ class FederationMakeJoinServlet(BaseFederationServlet): PATH = "/make_join/(?P[^/]*)/(?P[^/]*)" @defer.inlineCallbacks - def on_GET(self, origin, content, query, context, user_id): + def on_GET(self, origin, _content, query, context, user_id): + """ + Args: + origin (unicode): The authenticated server_name of the calling server + + _content (None): (GETs don't have bodies) + + query (dict[bytes, list[bytes]]): Query params from the request. + + **kwargs (dict[unicode, unicode]): the dict mapping keys to path + components as specified in the path match regexp. + + Returns: + Deferred[(int, object)|None]: either (response code, response object) to + return a JSON response, or None if the request has already been handled. + """ + versions = query.get(b'ver') + if versions is not None: + supported_versions = [v.decode("utf-8") for v in versions] + else: + supported_versions = ["1"] + content = yield self.handler.on_make_join_request( origin, context, user_id, + supported_versions=supported_versions, ) defer.returnValue((200, content)) -- cgit 1.4.1