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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.
This commit is contained in:
Richard van der Hoff 2018-07-25 22:25:41 +01:00
parent 0ca459ea33
commit 0d63d93ca8
3 changed files with 63 additions and 4 deletions

View file

@ -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.

View file

@ -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):

View file

@ -431,9 +431,31 @@ class FederationMakeJoinServlet(BaseFederationServlet):
PATH = "/make_join/(?P<context>[^/]*)/(?P<user_id>[^/]*)"
@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))