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Check m.room.create for sane room_versions

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This commit is contained in:
Richard van der Hoff 2018-08-06 15:15:19 +01:00
parent f900d50824
commit 19a17068f1
2 changed files with 32 additions and 4 deletions
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10
synapse/event_auth.py
View File

@ -20,7 +20,7 @@ from signedjson.key import decode_verify_key_bytes
from signedjson.sign import SignatureVerifyException, verify_signed_json from signedjson.sign import SignatureVerifyException, verify_signed_json
from unpaddedbase64 import decode_base64 from unpaddedbase64 import decode_base64
from synapse.api.constants import EventTypes, JoinRules, Membership from synapse.api.constants import KNOWN_ROOM_VERSIONS, EventTypes, JoinRules, Membership
from synapse.api.errors import AuthError, EventSizeError, SynapseError from synapse.api.errors import AuthError, EventSizeError, SynapseError
from synapse.types import UserID, get_domain_from_id from synapse.types import UserID, get_domain_from_id
@ -83,6 +83,14 @@ def check(event, auth_events, do_sig_check=True, do_size_check=True):
403, 403,
"Creation event's room_id domain does not match sender's" "Creation event's room_id domain does not match sender's"
) )
room_version = event.content.get("room_version", "1")
if room_version not in KNOWN_ROOM_VERSIONS:
raise AuthError(
403,
"room appears to have unsupported version %s" % (
room_version,
))
# FIXME # FIXME
logger.debug("Allowing! %s", event) logger.debug("Allowing! %s", event)
return return

26
synapse/federation/federation_client.py
View File

@ -25,7 +25,7 @@ from prometheus_client import Counter
from twisted.internet import defer from twisted.internet import defer
from synapse.api.constants import Membership from synapse.api.constants import KNOWN_ROOM_VERSIONS, EventTypes, Membership
from synapse.api.errors import ( from synapse.api.errors import (
CodeMessageException, CodeMessageException,
FederationDeniedError, FederationDeniedError,
@ -518,7 +518,7 @@ class FederationClient(FederationBase):
description, destination, exc_info=1, description, destination, exc_info=1,
) )
raise RuntimeError("Failed to %s via any server", description) raise RuntimeError("Failed to %s via any server" % (description, ))
def make_membership_event(self, destinations, room_id, user_id, membership, def make_membership_event(self, destinations, room_id, user_id, membership,
content, params): content, params):
@ -609,6 +609,26 @@ class FederationClient(FederationBase):
Fails with a ``RuntimeError`` if no servers were reachable. Fails with a ``RuntimeError`` if no servers were reachable.
""" """
def check_authchain_validity(signed_auth_chain):
for e in signed_auth_chain:
if e.type == EventTypes.Create:
create_event = e
break
else:
raise InvalidResponseError(
"no %s in auth chain" % (EventTypes.Create,),
)
# the room version should be sane.
room_version = create_event.content.get("room_version", "1")
if room_version not in KNOWN_ROOM_VERSIONS:
# This shouldn't be possible, because the remote server should have
# rejected the join attempt during make_join.
raise InvalidResponseError(
"room appears to have unsupported version %s" % (
room_version,
))
@defer.inlineCallbacks @defer.inlineCallbacks
def send_request(destination): def send_request(destination):
time_now = self._clock.time_msec() time_now = self._clock.time_msec()
@ -665,7 +685,7 @@ class FederationClient(FederationBase):
for s in signed_state: for s in signed_state:
s.internal_metadata = copy.deepcopy(s.internal_metadata) s.internal_metadata = copy.deepcopy(s.internal_metadata)
auth_chain.sort(key=lambda e: e.depth) check_authchain_validity(signed_auth)
defer.returnValue({ defer.returnValue({
"state": signed_state, "state": signed_state,