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Support MSC3757: Restricting who can overwrite a state event (#17513)

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Link to the
MSC: https://github.com/matrix-org/matrix-spec-proposals/pull/3757

---------

Co-authored-by: Quentin Gliech <quenting@element.io>
This commit is contained in:
Andrew Ferrazzutti 2024-09-26 09:25:05 -04:00 committed by GitHub
parent 13dea6949b
commit 302534c348
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GPG key ID: B5690EEEBB952194
5 changed files with 399 additions and 6 deletions
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1
changelog.d/17513.feature Normal file
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@ -0,0 +1 @@
Add implementation of restricting who can overwrite a state event as proposed by [MSC3757](https://github.com/matrix-org/matrix-spec-proposals/pull/3757).

1
scripts-dev/complement.sh
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@ -220,6 +220,7 @@ test_packages=(
./tests/msc3874
./tests/msc3890
./tests/msc3391
./tests/msc3757
./tests/msc3930
./tests/msc3902
./tests/msc3967

58
synapse/api/room_versions.py
View file

@ -107,6 +107,8 @@ class RoomVersion:
# support the flag. Unknown flags are ignored by the evaluator, making conditions
# fail if used.
msc3931_push_features: Tuple[str, ...] # values from PushRuleRoomFlag
# MSC3757: Restricting who can overwrite a state event
msc3757_enabled: bool
class RoomVersions:
@ -128,6 +130,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V2 = RoomVersion(
"2",
@ -147,6 +150,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V3 = RoomVersion(
"3",
@ -166,6 +170,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V4 = RoomVersion(
"4",
@ -185,6 +190,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V5 = RoomVersion(
"5",
@ -204,6 +210,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V6 = RoomVersion(
"6",
@ -223,6 +230,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V7 = RoomVersion(
"7",
@ -242,6 +250,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V8 = RoomVersion(
"8",
@ -261,6 +270,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V9 = RoomVersion(
"9",
@ -280,6 +290,7 @@ class RoomVersions:
knock_restricted_join_rule=False,
enforce_int_power_levels=False,
msc3931_push_features=(),
msc3757_enabled=False,
)
V10 = RoomVersion(
"10",
@ -299,6 +310,7 @@ class RoomVersions:
knock_restricted_join_rule=True,
enforce_int_power_levels=True,
msc3931_push_features=(),
msc3757_enabled=False,
)
MSC1767v10 = RoomVersion(
# MSC1767 (Extensible Events) based on room version "10"
@ -319,6 +331,28 @@ class RoomVersions:
knock_restricted_join_rule=True,
enforce_int_power_levels=True,
msc3931_push_features=(PushRuleRoomFlag.EXTENSIBLE_EVENTS,),
msc3757_enabled=False,
)
MSC3757v10 = RoomVersion(
# MSC3757 (Restricting who can overwrite a state event) based on room version "10"
"org.matrix.msc3757.10",
RoomDisposition.UNSTABLE,
EventFormatVersions.ROOM_V4_PLUS,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
implicit_room_creator=False,
updated_redaction_rules=False,
restricted_join_rule=True,
restricted_join_rule_fix=True,
knock_join_rule=True,
msc3389_relation_redactions=False,
knock_restricted_join_rule=True,
enforce_int_power_levels=True,
msc3931_push_features=(),
msc3757_enabled=True,
)
V11 = RoomVersion(
"11",
@ -338,6 +372,28 @@ class RoomVersions:
knock_restricted_join_rule=True,
enforce_int_power_levels=True,
msc3931_push_features=(),
msc3757_enabled=False,
)
MSC3757v11 = RoomVersion(
# MSC3757 (Restricting who can overwrite a state event) based on room version "11"
"org.matrix.msc3757.11",
RoomDisposition.UNSTABLE,
EventFormatVersions.ROOM_V4_PLUS,
StateResolutionVersions.V2,
enforce_key_validity=True,
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
implicit_room_creator=True, # Used by MSC3820
updated_redaction_rules=True, # Used by MSC3820
restricted_join_rule=True,
restricted_join_rule_fix=True,
knock_join_rule=True,
msc3389_relation_redactions=False,
knock_restricted_join_rule=True,
enforce_int_power_levels=True,
msc3931_push_features=(),
msc3757_enabled=True,
)
@ -355,6 +411,8 @@ KNOWN_ROOM_VERSIONS: Dict[str, RoomVersion] = {
RoomVersions.V9,
RoomVersions.V10,
RoomVersions.V11,
RoomVersions.MSC3757v10,
RoomVersions.MSC3757v11,
)
}

37
synapse/event_auth.py
View file

@ -388,6 +388,7 @@ LENIENT_EVENT_BYTE_LIMITS_ROOM_VERSIONS = {
RoomVersions.V9,
RoomVersions.V10,
RoomVersions.MSC1767v10,
RoomVersions.MSC3757v10,
}
@ -790,9 +791,10 @@ def get_send_level(
def _can_send_event(event: "EventBase", auth_events: StateMap["EventBase"]) -> bool:
state_key = event.get_state_key()
power_levels_event = get_power_level_event(auth_events)
send_level = get_send_level(event.type, event.get("state_key"), power_levels_event)
send_level = get_send_level(event.type, state_key, power_levels_event)
user_level = get_user_power_level(event.user_id, auth_events)
if user_level < send_level:
@ -803,11 +805,34 @@ def _can_send_event(event: "EventBase", auth_events: StateMap["EventBase"]) -> b
errcode=Codes.INSUFFICIENT_POWER,
)
# Check state_key
if hasattr(event, "state_key"):
if event.state_key.startswith("@"):
if event.state_key != event.user_id:
raise AuthError(403, "You are not allowed to set others state")
if (
state_key is not None
and state_key.startswith("@")
and state_key != event.user_id
):
if event.room_version.msc3757_enabled:
try:
colon_idx = state_key.index(":", 1)
suffix_idx = state_key.find("_", colon_idx + 1)
state_key_user_id = (
state_key[:suffix_idx] if suffix_idx != -1 else state_key
)
if not UserID.is_valid(state_key_user_id):
raise ValueError
except ValueError:
raise SynapseError(
400,
"State key neither equals a valid user ID, nor starts with one plus an underscore",
errcode=Codes.BAD_JSON,
)
if (
# sender is owner of the state key
state_key_user_id == event.user_id
# sender has higher PL than the owner of the state key
or user_level > get_user_power_level(state_key_user_id, auth_events)
):
return True
raise AuthError(403, "You are not allowed to set others state")
return True

308
tests/rest/client/test_owned_state.py Normal file
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@ -0,0 +1,308 @@
from http import HTTPStatus
from parameterized import parameterized_class
from twisted.test.proto_helpers import MemoryReactor
from synapse.api.errors import Codes
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersions
from synapse.rest import admin
from synapse.rest.client import login, room
from synapse.server import HomeServer
from synapse.types import JsonDict
from synapse.util import Clock
from tests.unittest import HomeserverTestCase
_STATE_EVENT_TEST_TYPE = "com.example.test"
# To stress-test parsing, include separator & sigil characters
_STATE_KEY_SUFFIX = "_state_key_suffix:!@#$123"
class OwnedStateBase(HomeserverTestCase):
servlets = [
admin.register_servlets,
room.register_servlets,
login.register_servlets,
]
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
self.creator_user_id = self.register_user("creator", "pass")
self.creator_access_token = self.login("creator", "pass")
self.user1_user_id = self.register_user("user1", "pass")
self.user1_access_token = self.login("user1", "pass")
self.room_id = self.helper.create_room_as(
self.creator_user_id,
tok=self.creator_access_token,
is_public=True,
extra_content={
"power_level_content_override": {
"events": {
_STATE_EVENT_TEST_TYPE: 0,
},
},
},
)
self.helper.join(
room=self.room_id, user=self.user1_user_id, tok=self.user1_access_token
)
class WithoutOwnedStateTestCase(OwnedStateBase):
def default_config(self) -> JsonDict:
config = super().default_config()
config["default_room_version"] = RoomVersions.V10.identifier
return config
def test_user_can_set_state_with_own_userid_key(self) -> None:
self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}",
tok=self.user1_access_token,
expect_code=HTTPStatus.OK,
)
def test_room_creator_cannot_set_state_with_own_suffixed_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.creator_user_id}{_STATE_KEY_SUFFIX}",
tok=self.creator_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_room_creator_cannot_set_state_with_other_userid_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}",
tok=self.creator_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_room_creator_cannot_set_state_with_other_suffixed_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}{_STATE_KEY_SUFFIX}",
tok=self.creator_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_room_creator_cannot_set_state_with_nonmember_userid_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key="@notinroom:hs2",
tok=self.creator_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_room_creator_cannot_set_state_with_malformed_userid_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key="@oops",
tok=self.creator_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
@parameterized_class(
("room_version",),
[(i,) for i, v in KNOWN_ROOM_VERSIONS.items() if v.msc3757_enabled],
)
class MSC3757OwnedStateTestCase(OwnedStateBase):
room_version: str
def default_config(self) -> JsonDict:
config = super().default_config()
config["default_room_version"] = self.room_version
return config
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
super().prepare(reactor, clock, hs)
self.user2_user_id = self.register_user("user2", "pass")
self.user2_access_token = self.login("user2", "pass")
self.helper.join(
room=self.room_id, user=self.user2_user_id, tok=self.user2_access_token
)
def test_user_can_set_state_with_own_suffixed_key(self) -> None:
self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}{_STATE_KEY_SUFFIX}",
tok=self.user1_access_token,
expect_code=HTTPStatus.OK,
)
def test_room_creator_can_set_state_with_other_userid_key(self) -> None:
self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}",
tok=self.creator_access_token,
expect_code=HTTPStatus.OK,
)
def test_room_creator_can_set_state_with_other_suffixed_key(self) -> None:
self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}{_STATE_KEY_SUFFIX}",
tok=self.creator_access_token,
expect_code=HTTPStatus.OK,
)
def test_user_cannot_set_state_with_other_userid_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user2_user_id}",
tok=self.user1_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_user_cannot_set_state_with_other_suffixed_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user2_user_id}{_STATE_KEY_SUFFIX}",
tok=self.user1_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_user_cannot_set_state_with_unseparated_suffixed_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.user1_user_id}{_STATE_KEY_SUFFIX[1:]}",
tok=self.user1_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_user_cannot_set_state_with_misplaced_userid_in_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
# Still put @ at start of state key, because without it, there is no write protection at all
state_key=f"@prefix_{self.user1_user_id}{_STATE_KEY_SUFFIX}",
tok=self.user1_access_token,
expect_code=HTTPStatus.FORBIDDEN,
)
self.assertEqual(
body["errcode"],
Codes.FORBIDDEN,
body,
)
def test_room_creator_can_set_state_with_nonmember_userid_key(self) -> None:
self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key="@notinroom:hs2",
tok=self.creator_access_token,
expect_code=HTTPStatus.OK,
)
def test_room_creator_cannot_set_state_with_malformed_userid_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key="@oops",
tok=self.creator_access_token,
expect_code=HTTPStatus.BAD_REQUEST,
)
self.assertEqual(
body["errcode"],
Codes.BAD_JSON,
body,
)
def test_room_creator_cannot_set_state_with_improperly_suffixed_key(self) -> None:
body = self.helper.send_state(
self.room_id,
_STATE_EVENT_TEST_TYPE,
{},
state_key=f"{self.creator_user_id}@{_STATE_KEY_SUFFIX[1:]}",
tok=self.creator_access_token,
expect_code=HTTPStatus.BAD_REQUEST,
)
self.assertEqual(
body["errcode"],
Codes.BAD_JSON,
body,
)