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Stop shadow-banned users from sending invites. (#8095)

This commit is contained in:
Patrick Cloke 2020-08-20 15:07:42 -04:00 committed by GitHub
parent 318f4e738e
commit e259d63f73
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7 changed files with 226 additions and 31 deletions
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1
changelog.d/8095.feature Normal file
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@ -0,0 +1 @@
Add support for shadow-banning users (ignoring any message send requests).

8
synapse/api/errors.py
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@ -604,3 +604,11 @@ class HttpResponseException(CodeMessageException):
errmsg = j.pop("error", self.msg)
return ProxiedRequestError(self.code, errmsg, errcode, j)
class ShadowBanError(Exception):
"""
Raised when a shadow-banned user attempts to perform an action.
This should be caught and a proper "fake" success response sent to the user.
"""

16
synapse/handlers/room.py
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@ -20,6 +20,7 @@
import itertools
import logging
import math
import random
import string
from collections import OrderedDict
from typing import TYPE_CHECKING, Any, Awaitable, Dict, List, Optional, Tuple
@ -626,6 +627,7 @@ class RoomCreationHandler(BaseHandler):
if mapping:
raise SynapseError(400, "Room alias already taken", Codes.ROOM_IN_USE)
invite_3pid_list = config.get("invite_3pid", [])
invite_list = config.get("invite", [])
for i in invite_list:
try:
@ -634,6 +636,14 @@ class RoomCreationHandler(BaseHandler):
except Exception:
raise SynapseError(400, "Invalid user_id: %s" % (i,))
if (invite_list or invite_3pid_list) and requester.shadow_banned:
# We randomly sleep a bit just to annoy the requester.
await self.clock.sleep(random.randint(1, 10))
# Allow the request to go through, but remove any associated invites.
invite_3pid_list = []
invite_list = []
await self.event_creation_handler.assert_accepted_privacy_policy(requester)
power_level_content_override = config.get("power_level_content_override")
@ -648,8 +658,6 @@ class RoomCreationHandler(BaseHandler):
% (user_id,),
)
invite_3pid_list = config.get("invite_3pid", [])
visibility = config.get("visibility", None)
is_public = visibility == "public"
@ -744,6 +752,8 @@ class RoomCreationHandler(BaseHandler):
if is_direct:
content["is_direct"] = is_direct
# Note that update_membership with an action of "invite" can raise a
# ShadowBanError, but this was handled above by emptying invite_list.
_, last_stream_id = await self.room_member_handler.update_membership(
requester,
UserID.from_string(invitee),
@ -758,6 +768,8 @@ class RoomCreationHandler(BaseHandler):
id_access_token = invite_3pid.get("id_access_token") # optional
address = invite_3pid["address"]
medium = invite_3pid["medium"]
# Note that do_3pid_invite can raise a ShadowBanError, but this was
# handled above by emptying invite_3pid_list.
last_stream_id = await self.hs.get_room_member_handler().do_3pid_invite(
room_id,
requester.user,

62
synapse/handlers/room_member.py
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@ -15,6 +15,7 @@
import abc
import logging
import random
from http import HTTPStatus
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union
@ -22,7 +23,13 @@ from unpaddedbase64 import encode_base64
from synapse import types
from synapse.api.constants import MAX_DEPTH, EventTypes, Membership
from synapse.api.errors import AuthError, Codes, LimitExceededError, SynapseError
from synapse.api.errors import (
AuthError,
Codes,
LimitExceededError,
ShadowBanError,
SynapseError,
)
from synapse.api.ratelimiting import Ratelimiter
from synapse.api.room_versions import EventFormatVersions
from synapse.crypto.event_signing import compute_event_reference_hash
@ -285,6 +292,31 @@ class RoomMemberHandler(object):
content: Optional[dict] = None,
require_consent: bool = True,
) -> Tuple[str, int]:
"""Update a user's membership in a room.
Params:
requester: The user who is performing the update.
target: The user whose membership is being updated.
room_id: The room ID whose membership is being updated.
action: The membership change, see synapse.api.constants.Membership.
txn_id: The transaction ID, if given.
remote_room_hosts: Remote servers to send the update to.
third_party_signed: Information from a 3PID invite.
ratelimit: Whether to rate limit the request.
content: The content of the created event.
require_consent: Whether consent is required.
Returns:
A tuple of the new event ID and stream ID.
Raises:
ShadowBanError if a shadow-banned requester attempts to send an invite.
"""
if action == Membership.INVITE and requester.shadow_banned:
# We randomly sleep a bit just to annoy the requester.
await self.clock.sleep(random.randint(1, 10))
raise ShadowBanError()
key = (room_id,)
with (await self.member_linearizer.queue(key)):
@ -773,6 +805,25 @@ class RoomMemberHandler(object):
txn_id: Optional[str],
id_access_token: Optional[str] = None,
) -> int:
"""Invite a 3PID to a room.
Args:
room_id: The room to invite the 3PID to.
inviter: The user sending the invite.
medium: The 3PID's medium.
address: The 3PID's address.
id_server: The identity server to use.
requester: The user making the request.
txn_id: The transaction ID this is part of, or None if this is not
part of a transaction.
id_access_token: The optional identity server access token.
Returns:
The new stream ID.
Raises:
ShadowBanError if the requester has been shadow-banned.
"""
if self.config.block_non_admin_invites:
is_requester_admin = await self.auth.is_server_admin(requester.user)
if not is_requester_admin:
@ -780,6 +831,11 @@ class RoomMemberHandler(object):
403, "Invites have been disabled on this server", Codes.FORBIDDEN
)
if requester.shadow_banned:
# We randomly sleep a bit just to annoy the requester.
await self.clock.sleep(random.randint(1, 10))
raise ShadowBanError()
# We need to rate limit *before* we send out any 3PID invites, so we
# can't just rely on the standard ratelimiting of events.
await self.base_handler.ratelimit(requester)
@ -804,6 +860,8 @@ class RoomMemberHandler(object):
)
if invitee:
# Note that update_membership with an action of "invite" can raise
# a ShadowBanError, but this was done above already.
_, stream_id = await self.update_membership(
requester, UserID.from_string(invitee), room_id, "invite", txn_id=txn_id
)
@ -1042,7 +1100,7 @@ class RoomMemberMasterHandler(RoomMemberHandler):
return event_id, stream_id
# The room is too large. Leave.
requester = types.create_requester(user, None, False, None)
requester = types.create_requester(user, None, False, False, None)
await self.update_membership(
requester=requester, target=user, room_id=room_id, action="leave"
)

3
synapse/rest/admin/rooms.py
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@ -316,6 +316,9 @@ class JoinRoomAliasServlet(RestServlet):
join_rules_event = room_state.get((EventTypes.JoinRules, ""))
if join_rules_event:
if not (join_rules_event.content.get("join_rule") == JoinRules.PUBLIC):
# update_membership with an action of "invite" can raise a
# ShadowBanError. This is not handled since it is assumed that
# an admin isn't going to call this API with a shadow-banned user.
await self.room_member_handler.update_membership(
requester=requester,
target=fake_requester.user,

13
synapse/rest/client/v1/room.py
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@ -27,6 +27,7 @@ from synapse.api.errors import (
Codes,
HttpResponseException,
InvalidClientCredentialsError,
ShadowBanError,
SynapseError,
)
from synapse.api.filtering import Filter
@ -45,6 +46,7 @@ from synapse.storage.state import StateFilter
from synapse.streams.config import PaginationConfig
from synapse.types import RoomAlias, RoomID, StreamToken, ThirdPartyInstanceID, UserID
from synapse.util import json_decoder
from synapse.util.stringutils import random_string
MYPY = False
if MYPY:
@ -200,6 +202,7 @@ class RoomStateEventRestServlet(TransactionRestServlet):
event_dict["state_key"] = state_key
if event_type == EventTypes.Member:
try:
membership = content.get("membership", None)
event_id, _ = await self.room_member_handler.update_membership(
requester,
@ -208,6 +211,8 @@ class RoomStateEventRestServlet(TransactionRestServlet):
action=membership,
content=content,
)
except ShadowBanError:
event_id = "$" + random_string(43)
else:
(
event,
@ -719,6 +724,7 @@ class RoomMembershipRestServlet(TransactionRestServlet):
content = {}
if membership_action == "invite" and self._has_3pid_invite_keys(content):
try:
await self.room_member_handler.do_3pid_invite(
room_id,
requester.user,
@ -729,6 +735,9 @@ class RoomMembershipRestServlet(TransactionRestServlet):
txn_id,
content.get("id_access_token"),
)
except ShadowBanError:
# Pretend the request succeeded.
pass
return 200, {}
target = requester.user
@ -740,6 +749,7 @@ class RoomMembershipRestServlet(TransactionRestServlet):
if "reason" in content:
event_content = {"reason": content["reason"]}
try:
await self.room_member_handler.update_membership(
requester=requester,
target=target,
@ -749,6 +759,9 @@ class RoomMembershipRestServlet(TransactionRestServlet):
third_party_signed=content.get("third_party_signed", None),
content=event_content,
)
except ShadowBanError:
# Pretend the request succeeded.
pass
return_value = {}

100
tests/rest/client/v1/test_rooms.py
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@ -1974,3 +1974,103 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
"""An alias which does not point to the room raises a SynapseError."""
self._set_canonical_alias({"alias": "@unknown:test"}, expected_code=400)
self._set_canonical_alias({"alt_aliases": ["@unknown:test"]}, expected_code=400)
class ShadowBannedTestCase(unittest.HomeserverTestCase):
servlets = [
synapse.rest.admin.register_servlets_for_client_rest_resource,
directory.register_servlets,
login.register_servlets,
room.register_servlets,
]
def prepare(self, reactor, clock, homeserver):
self.banned_user_id = self.register_user("banned", "test")
self.banned_access_token = self.login("banned", "test")
self.store = self.hs.get_datastore()
self.get_success(
self.store.db_pool.simple_update(
table="users",
keyvalues={"name": self.banned_user_id},
updatevalues={"shadow_banned": True},
desc="shadow_ban",
)
)
self.other_user_id = self.register_user("otheruser", "pass")
self.other_access_token = self.login("otheruser", "pass")
def test_invite(self):
"""Invites from shadow-banned users don't actually get sent."""
# The create works fine.
room_id = self.helper.create_room_as(
self.banned_user_id, tok=self.banned_access_token
)
# Inviting the user completes successfully.
self.helper.invite(
room=room_id,
src=self.banned_user_id,
tok=self.banned_access_token,
targ=self.other_user_id,
)
# But the user wasn't actually invited.
invited_rooms = self.get_success(
self.store.get_invited_rooms_for_local_user(self.other_user_id)
)
self.assertEqual(invited_rooms, [])
def test_invite_3pid(self):
"""Ensure that a 3PID invite does not attempt to contact the identity server."""
identity_handler = self.hs.get_handlers().identity_handler
identity_handler.lookup_3pid = Mock(
side_effect=AssertionError("This should not get called")
)
# The create works fine.
room_id = self.helper.create_room_as(
self.banned_user_id, tok=self.banned_access_token
)
# Inviting the user completes successfully.
request, channel = self.make_request(
"POST",
"/rooms/%s/invite" % (room_id,),
{"id_server": "test", "medium": "email", "address": "test@test.test"},
access_token=self.banned_access_token,
)
self.render(request)
self.assertEquals(200, channel.code, channel.result)
# This should have raised an error earlier, but double check this wasn't called.
identity_handler.lookup_3pid.assert_not_called()
def test_create_room(self):
"""Invitations during a room creation should be discarded, but the room still gets created."""
# The room creation is successful.
request, channel = self.make_request(
"POST",
"/_matrix/client/r0/createRoom",
{"visibility": "public", "invite": [self.other_user_id]},
access_token=self.banned_access_token,
)
self.render(request)
self.assertEquals(200, channel.code, channel.result)
room_id = channel.json_body["room_id"]
# But the user wasn't actually invited.
invited_rooms = self.get_success(
self.store.get_invited_rooms_for_local_user(self.other_user_id)
)
self.assertEqual(invited_rooms, [])
# Since a real room was created, the other user should be able to join it.
self.helper.join(room_id, self.other_user_id, tok=self.other_access_token)
# Both users should be in the room.
users = self.get_success(self.store.get_users_in_room(room_id))
self.assertCountEqual(users, ["@banned:test", "@otheruser:test"])