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Fix bugs in invite/join dances.

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We now do more implement more of the auth on the events so that we
don't reject valid events.
This commit is contained in:
Erik Johnston 2014-11-25 11:31:18 +00:00
parent 3536fd7d60
commit 64fc859dac
8 changed files with 221 additions and 148 deletions
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150
synapse/api/auth.py
View File

@ -38,79 +38,66 @@ class Auth(object):
self.store = hs.get_datastore()
self.state = hs.get_state_handler()
def check(self, event, raises=False):
def check(self, event, auth_events):
""" Checks if this event is correctly authed.
Returns:
True if the auth checks pass.
Raises:
AuthError if there was a problem authorising this event. This will
be raised only if raises=True.
"""
try:
if hasattr(event, "room_id"):
if event.old_state_events is None:
# Oh, we don't know what the state of the room was, so we
# are trusting that this is allowed (at least for now)
logger.warn("Trusting event: %s", event.event_id)
return True
if hasattr(event, "outlier") and event.outlier is True:
# TODO (erikj): Auth for outliers is done differently.
return True
if event.type == RoomCreateEvent.TYPE:
# FIXME
return True
# FIXME: Temp hack
if event.type == RoomAliasesEvent.TYPE:
return True
if event.type == RoomMemberEvent.TYPE:
allowed = self.is_membership_change_allowed(event)
if allowed:
logger.debug("Allowing! %s", event)
else:
logger.debug("Denying! %s", event)
return allowed
self.check_event_sender_in_room(event)
self._can_send_event(event)
if event.type == RoomPowerLevelsEvent.TYPE:
self._check_power_levels(event)
if event.type == RoomRedactionEvent.TYPE:
self._check_redaction(event)
logger.debug("Allowing! %s", event)
if not hasattr(event, "room_id"):
raise AuthError(500, "Event has no room_id: %s" % event)
if auth_events is None:
# Oh, we don't know what the state of the room was, so we
# are trusting that this is allowed (at least for now)
logger.warn("Trusting event: %s", event.event_id)
return True
else:
raise AuthError(500, "Unknown event: %s" % event)
if event.type == RoomCreateEvent.TYPE:
# FIXME
return True
# FIXME: Temp hack
if event.type == RoomAliasesEvent.TYPE:
return True
if event.type == RoomMemberEvent.TYPE:
allowed = self.is_membership_change_allowed(
event, auth_events
)
if allowed:
logger.debug("Allowing! %s", event)
else:
logger.debug("Denying! %s", event)
return allowed
self.check_event_sender_in_room(event, auth_events)
self._can_send_event(event, auth_events)
if event.type == RoomPowerLevelsEvent.TYPE:
self._check_power_levels(event, auth_events)
if event.type == RoomRedactionEvent.TYPE:
self._check_redaction(event, auth_events)
logger.debug("Allowing! %s", event)
except AuthError as e:
logger.info(
"Event auth check failed on event %s with msg: %s",
event, e.msg
)
logger.info("Denying! %s", event)
if raises:
raise
return False
raise
@defer.inlineCallbacks
def check_joined_room(self, room_id, user_id):
try:
member = yield self.store.get_room_member(
room_id=room_id,
user_id=user_id
)
self._check_joined_room(member, user_id, room_id)
defer.returnValue(member)
except AttributeError:
pass
defer.returnValue(None)
member = yield self.state.get_current_state(
room_id=room_id,
event_type=RoomMemberEvent.TYPE,
state_key=user_id
)
self._check_joined_room(member, user_id, room_id)
defer.returnValue(member)
@defer.inlineCallbacks
def check_host_in_room(self, room_id, host):
@ -130,9 +117,9 @@ class Auth(object):
defer.returnValue(False)
def check_event_sender_in_room(self, event):
def check_event_sender_in_room(self, event, auth_events):
key = (RoomMemberEvent.TYPE, event.user_id, )
member_event = event.state_events.get(key)
member_event = auth_events.get(key)
return self._check_joined_room(
member_event,
@ -147,14 +134,14 @@ class Auth(object):
))
@log_function
def is_membership_change_allowed(self, event):
def is_membership_change_allowed(self, event, auth_events):
membership = event.content["membership"]
# Check if this is the room creator joining:
if len(event.prev_events) == 1 and Membership.JOIN == membership:
# Get room creation event:
key = (RoomCreateEvent.TYPE, "", )
create = event.old_state_events.get(key)
create = auth_events.get(key)
if create and event.prev_events[0][0] == create.event_id:
if create.content["creator"] == event.state_key:
return True
@ -163,19 +150,19 @@ class Auth(object):
# get info about the caller
key = (RoomMemberEvent.TYPE, event.user_id, )
caller = event.old_state_events.get(key)
caller = auth_events.get(key)
caller_in_room = caller and caller.membership == Membership.JOIN
caller_invited = caller and caller.membership == Membership.INVITE
# get info about the target
key = (RoomMemberEvent.TYPE, target_user_id, )
target = event.old_state_events.get(key)
target = auth_events.get(key)
target_in_room = target and target.membership == Membership.JOIN
key = (RoomJoinRulesEvent.TYPE, "", )
join_rule_event = event.old_state_events.get(key)
join_rule_event = auth_events.get(key)
if join_rule_event:
join_rule = join_rule_event.content.get(
"join_rule", JoinRules.INVITE
@ -186,11 +173,13 @@ class Auth(object):
user_level = self._get_power_level_from_event_state(
event,
event.user_id,
auth_events,
)
ban_level, kick_level, redact_level = (
self._get_ops_level_from_event_state(
event
event,
auth_events,
)
)
@ -260,9 +249,9 @@ class Auth(object):
return True
def _get_power_level_from_event_state(self, event, user_id):
def _get_power_level_from_event_state(self, event, user_id, auth_events):
key = (RoomPowerLevelsEvent.TYPE, "", )
power_level_event = event.old_state_events.get(key)
power_level_event = auth_events.get(key)
level = None
if power_level_event:
level = power_level_event.content.get("users", {}).get(user_id)
@ -270,16 +259,16 @@ class Auth(object):
level = power_level_event.content.get("users_default", 0)
else:
key = (RoomCreateEvent.TYPE, "", )
create_event = event.old_state_events.get(key)
create_event = auth_events.get(key)
if (create_event is not None and
create_event.content["creator"] == user_id):
return 100
return level
def _get_ops_level_from_event_state(self, event):
def _get_ops_level_from_event_state(self, event, auth_events):
key = (RoomPowerLevelsEvent.TYPE, "", )
power_level_event = event.old_state_events.get(key)
power_level_event = auth_events.get(key)
if power_level_event:
return (
@ -375,6 +364,11 @@ class Auth(object):
key = (RoomMemberEvent.TYPE, event.user_id, )
member_event = event.old_state_events.get(key)
key = (RoomCreateEvent.TYPE, "", )
create_event = event.old_state_events.get(key)
if create_event:
auth_events.append(create_event.event_id)
if join_rule_event:
join_rule = join_rule_event.content.get("join_rule")
is_public = join_rule == JoinRules.PUBLIC if join_rule else False
@ -406,9 +400,9 @@ class Auth(object):
event.auth_events = zip(auth_events, hashes)
@log_function
def _can_send_event(self, event):
def _can_send_event(self, event, auth_events):
key = (RoomPowerLevelsEvent.TYPE, "", )
send_level_event = event.old_state_events.get(key)
send_level_event = auth_events.get(key)
send_level = None
if send_level_event:
send_level = send_level_event.content.get("events", {}).get(
@ -432,6 +426,7 @@ class Auth(object):
user_level = self._get_power_level_from_event_state(
event,
event.user_id,
auth_events,
)
if user_level:
@ -468,14 +463,16 @@ class Auth(object):
return True
def _check_redaction(self, event):
def _check_redaction(self, event, auth_events):
user_level = self._get_power_level_from_event_state(
event,
event.user_id,
auth_events,
)
_, _, redact_level = self._get_ops_level_from_event_state(
event
event,
auth_events,
)
if user_level < redact_level:
@ -484,7 +481,7 @@ class Auth(object):
"You don't have permission to redact events"
)
def _check_power_levels(self, event):
def _check_power_levels(self, event, auth_events):
user_list = event.content.get("users", {})
# Validate users
for k, v in user_list.items():
@ -499,7 +496,7 @@ class Auth(object):
raise SynapseError(400, "Not a valid power level: %s" % (v,))
key = (event.type, event.state_key, )
current_state = event.old_state_events.get(key)
current_state = auth_events.get(key)
if not current_state:
return
@ -507,6 +504,7 @@ class Auth(object):
user_level = self._get_power_level_from_event_state(
event,
event.user_id,
auth_events,
)
# Check other levels:

1
synapse/api/events/__init__.py
View File

@ -125,6 +125,7 @@ class SynapseEvent(JsonEncodedObject):
pdu_json.pop("outlier", None)
pdu_json.pop("replaces_state", None)
pdu_json.pop("redacted", None)
pdu_json.pop("prev_content", None)
state_hash = pdu_json.pop("state_hash", None)
if state_hash is not None:
pdu_json.setdefault("unsigned", {})["state_hash"] = state_hash

42
synapse/federation/replication.py
View File

@ -481,11 +481,17 @@ class ReplicationLayer(object):
# FIXME: We probably want to do something with the auth_chain given
# to us
# auth_chain = [
# Pdu(outlier=True, **p) for p in content.get("auth_chain", [])
# ]
auth_chain = [
self.event_from_pdu_json(p, outlier=True)
for p in content.get("auth_chain", [])
]
defer.returnValue(state)
auth_chain.sort(key=lambda e: e.depth)
defer.returnValue({
"state": state,
"auth_chain": auth_chain,
})
@defer.inlineCallbacks
def send_invite(self, destination, context, event_id, pdu):
@ -551,12 +557,26 @@ class ReplicationLayer(object):
)
if not exists:
yield self.get_pdu(
origin,
event_id=e_id,
outlier=True,
)
logger.debug("Processed pdu %s", e_id)
try:
logger.debug(
"Getting missing auth event %s from %s",
e_id,
origin,
)
yield self.get_pdu(
origin,
event_id=e_id,
outlier=True,
)
logger.debug("Processed pdu %s", e_id)
except:
logger.warn(
"Failed to get auth event %s from %s",
e_id,
origin
)
# Get missing pdus if necessary.
if not pdu.outlier:
@ -578,7 +598,7 @@ class ReplicationLayer(object):
try:
yield self.get_pdu(
pdu.origin,
origin,
event_id=event_id,
)
logger.debug("Processed pdu %s", event_id)

2
synapse/handlers/_base.py
View File

@ -78,7 +78,7 @@ class BaseHandler(object):
if not suppress_auth:
logger.debug("Authing...")
self.auth.check(event, raises=True)
self.auth.check(event, auth_events=event.old_state_events)
logger.debug("Authed")
else:
logger.debug("Suppressed auth.")

144
synapse/handlers/federation.py
View File

@ -24,7 +24,8 @@ from synapse.api.constants import Membership
from synapse.util.logutils import log_function
from synapse.util.async import run_on_reactor
from synapse.crypto.event_signing import (
compute_event_signature, check_event_content_hash
compute_event_signature, check_event_content_hash,
add_hashes_and_signatures,
)
from syutil.jsonutil import encode_canonical_json
@ -141,15 +142,14 @@ class FederationHandler(BaseHandler):
)
event = redacted_event
is_new_state = yield self.state_handler.annotate_event_with_state(
event,
old_state=state
)
logger.debug("Event: %s", event)
try:
self.auth.check(event, raises=True)
yield self._handle_new_event(
event,
state=state,
backfilled=backfilled
)
except AuthError as e:
raise FederationError(
"ERROR",
@ -158,17 +158,6 @@ class FederationHandler(BaseHandler):
affected=event.event_id,
)
is_new_state = is_new_state and not backfilled
# TODO: Implement something in federation that allows us to
# respond to PDU.
yield self.store.persist_event(
event,
backfilled,
is_new_state=is_new_state
)
room = yield self.store.get_room(event.room_id)
if not room:
@ -276,6 +265,8 @@ class FederationHandler(BaseHandler):
We suspend processing of any received events from this room until we
have finished processing the join.
"""
logger.debug("Joining %s to %s", joinee, room_id)
pdu = yield self.replication_layer.make_join(
target_host,
room_id,
@ -298,19 +289,28 @@ class FederationHandler(BaseHandler):
try:
event.event_id = self.event_factory.create_event_id()
event.origin = self.hs.hostname
event.content = content
state = yield self.replication_layer.send_join(
if not hasattr(event, "signatures"):
event.signatures = {}
add_hashes_and_signatures(
event,
self.hs.hostname,
self.hs.config.signing_key[0],
)
ret = yield self.replication_layer.send_join(
target_host,
event
)
logger.debug("do_invite_join state: %s", state)
state = ret["state"]
auth_chain = ret["auth_chain"]
yield self.state_handler.annotate_event_with_state(
event,
old_state=state
)
logger.debug("do_invite_join auth_chain: %s", auth_chain)
logger.debug("do_invite_join state: %s", state)
logger.debug("do_invite_join event: %s", event)
@ -324,34 +324,31 @@ class FederationHandler(BaseHandler):
# FIXME
pass
for e in auth_chain:
e.outlier = True
yield self._handle_new_event(e)
for e in state:
# FIXME: Auth these.
e.outlier = True
yield self._handle_new_event(e)
yield self.state_handler.annotate_event_with_state(
e,
)
yield self._handle_new_event(event, state=state)
yield self.store.persist_event(
e,
backfilled=False,
is_new_state=True
)
yield self.store.persist_event(
event,
backfilled=False,
is_new_state=True
yield self.notifier.on_new_room_event(
event, extra_users=[joinee]
)
logger.debug("Finished joining %s to %s", joinee, room_id)
finally:
room_queue = self.room_queues[room_id]
del self.room_queues[room_id]
for p in room_queue:
try:
yield self.on_receive_pdu(p, backfilled=False)
self.on_receive_pdu(p, backfilled=False)
except:
pass
logger.exception("Couldn't handle pdu")
defer.returnValue(True)
@ -375,7 +372,7 @@ class FederationHandler(BaseHandler):
yield self.state_handler.annotate_event_with_state(event)
yield self.auth.add_auth_events(event)
self.auth.check(event, raises=True)
self.auth.check(event, auth_events=event.old_state_events)
pdu = event
@ -391,17 +388,7 @@ class FederationHandler(BaseHandler):
event.outlier = False
state_handler = self.state_handler
is_new_state = yield state_handler.annotate_event_with_state(event)
self.auth.check(event, raises=True)
# FIXME (erikj): All this is duplicated above :(
yield self.store.persist_event(
event,
backfilled=False,
is_new_state=is_new_state
)
yield self._handle_new_event(event)
extra_users = []
if event.type == RoomMemberEvent.TYPE:
@ -414,7 +401,7 @@ class FederationHandler(BaseHandler):
)
if event.type == RoomMemberEvent.TYPE:
if event.membership == Membership.JOIN:
if event.content["membership"] == Membership.JOIN:
user = self.hs.parse_userid(event.state_key)
yield self.distributor.fire(
"user_joined_room", user=user, room_id=event.room_id
@ -565,3 +552,56 @@ class FederationHandler(BaseHandler):
)
while waiters:
waiters.pop().callback(None)
@defer.inlineCallbacks
def _handle_new_event(self, event, state=None, backfilled=False):
is_new_state = yield self.state_handler.annotate_event_with_state(
event,
old_state=state
)
if event.old_state_events:
known_ids = set(
[s.event_id for s in event.old_state_events.values()]
)
for e_id, _ in event.auth_events:
if e_id not in known_ids:
e = yield self.store.get_event(
e_id,
allow_none=True,
)
if not e:
# TODO: Do some conflict res to make sure that we're
# not the ones who are wrong.
logger.info(
"Rejecting %s as %s not in %s",
event.event_id, e_id, known_ids,
)
raise AuthError(403, "Auth events are stale")
auth_events = event.old_state_events
else:
# We need to get the auth events from somewhere.
# TODO: Don't just hit the DBs?
auth_events = {}
for e_id, _ in event.auth_events:
e = yield self.store.get_event(
e_id,
allow_none=True,
)
if not e:
raise AuthError(403, "Can't find auth event.")
auth_events[(e.type, e.state_key)] = e
self.auth.check(event, auth_events=auth_events)
yield self.store.persist_event(
event,
backfilled=backfilled,
is_new_state=(is_new_state and not backfilled)
)

2
synapse/handlers/message.py
View File

@ -306,7 +306,7 @@ class MessageHandler(BaseHandler):
auth_user = self.hs.parse_userid(user_id)
# TODO: These concurrently
state_tuples = yield self.store.get_current_state(room_id)
state_tuples = yield self.state_handler.get_current_state(room_id)
state = [self.hs.serialize_event(x) for x in state_tuples]
member_event = (yield self.store.get_room_member(

12
tests/handlers/test_federation.py
View File

@ -83,20 +83,22 @@ class FederationTestCase(unittest.TestCase):
event_id="$a:b",
user_id="@a:b",
origin="b",
auth_events=[],
hashes={"sha256":"AcLrgtUIqqwaGoHhrEvYG1YLDIsVPYJdSRGhkp3jJp8"},
)
self.datastore.persist_event.return_value = defer.succeed(None)
self.datastore.get_room.return_value = defer.succeed(True)
self.state_handler.annotate_event_with_state.return_value = (
defer.succeed(False)
)
def annotate(ev, old_state=None):
ev.old_state_events = []
return defer.succeed(False)
self.state_handler.annotate_event_with_state.side_effect = annotate
yield self.handlers.federation_handler.on_receive_pdu(pdu, False)
self.datastore.persist_event.assert_called_once_with(
ANY, False, is_new_state=False
ANY, is_new_state=False, backfilled=False
)
self.state_handler.annotate_event_with_state.assert_called_once_with(
@ -104,7 +106,7 @@ class FederationTestCase(unittest.TestCase):
old_state=None,
)
self.auth.check.assert_called_once_with(ANY, raises=True)
self.auth.check.assert_called_once_with(ANY, auth_events={})
self.notifier.on_new_room_event.assert_called_once_with(
ANY,

16
tests/handlers/test_room.py
View File

@ -120,7 +120,7 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
self.datastore.get_room_member.return_value = defer.succeed(None)
event.state_events = {
event.old_state_events = {
(RoomMemberEvent.TYPE, "@alice:green"): self._create_member(
user_id="@alice:green",
room_id=room_id,
@ -129,9 +129,11 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
user_id="@bob:red",
room_id=room_id,
),
(RoomMemberEvent.TYPE, target_user_id): event,
}
event.state_events = event.old_state_events
event.state_events[(RoomMemberEvent.TYPE, target_user_id)] = event
# Actual invocation
yield self.room_member_handler.change_membership(event)
@ -187,6 +189,16 @@ class RoomMemberHandlerTestCase(unittest.TestCase):
(RoomMemberEvent.TYPE, user_id): event,
}
event.old_state_events = {
(RoomMemberEvent.TYPE, "@alice:green"): self._create_member(
user_id="@alice:green",
room_id=room_id,
),
}
event.state_events = event.old_state_events
event.state_events[(RoomMemberEvent.TYPE, user_id)] = event
# Actual invocation
yield self.room_member_handler.change_membership(event)