diff options
Diffstat (limited to 'synapse/events')
| -rw-r--r-- | synapse/events/utils.py | 5 | ||||
| -rw-r--r-- | synapse/events/validator.py | 77 |
2 files changed, 79 insertions, 3 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py index b6da2f60af..738a151cef 100644 --- a/synapse/events/utils.py +++ b/synapse/events/utils.py @@ -32,6 +32,9 @@ from . import EventBase # the literal fields "foo\" and "bar" but will instead be treated as "foo\\.bar" SPLIT_FIELD_REGEX = re.compile(r"(?<!\\)\.") +CANONICALJSON_MAX_INT = (2 ** 53) - 1 +CANONICALJSON_MIN_INT = -CANONICALJSON_MAX_INT + def prune_event(event: EventBase) -> EventBase: """Returns a pruned version of the given event, which removes all keys we @@ -505,7 +508,7 @@ def validate_canonicaljson(value: Any): * NaN, Infinity, -Infinity """ if isinstance(value, int): - if value <= -(2 ** 53) or 2 ** 53 <= value: + if value < CANONICALJSON_MIN_INT or CANONICALJSON_MAX_INT < value: raise SynapseError(400, "JSON integer out of range", Codes.BAD_JSON) elif isinstance(value, float): diff --git a/synapse/events/validator.py b/synapse/events/validator.py index fa6987d7cb..33954b4f62 100644 --- a/synapse/events/validator.py +++ b/synapse/events/validator.py @@ -11,16 +11,22 @@ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. - +import collections.abc from typing import Union +import jsonschema + from synapse.api.constants import MAX_ALIAS_LENGTH, EventTypes, Membership from synapse.api.errors import Codes, SynapseError from synapse.api.room_versions import EventFormatVersions from synapse.config.homeserver import HomeServerConfig from synapse.events import EventBase from synapse.events.builder import EventBuilder -from synapse.events.utils import validate_canonicaljson +from synapse.events.utils import ( + CANONICALJSON_MAX_INT, + CANONICALJSON_MIN_INT, + validate_canonicaljson, +) from synapse.federation.federation_server import server_matches_acl_event from synapse.types import EventID, RoomID, UserID @@ -87,6 +93,29 @@ class EventValidator: 400, "Can't create an ACL event that denies the local server" ) + if event.type == EventTypes.PowerLevels: + try: + jsonschema.validate( + instance=event.content, + schema=POWER_LEVELS_SCHEMA, + cls=plValidator, + ) + except jsonschema.ValidationError as e: + if e.path: + # example: "users_default": '0' is not of type 'integer' + message = '"' + e.path[-1] + '": ' + e.message # noqa: B306 + # jsonschema.ValidationError.message is a valid attribute + else: + # example: '0' is not of type 'integer' + message = e.message # noqa: B306 + # jsonschema.ValidationError.message is a valid attribute + + raise SynapseError( + code=400, + msg=message, + errcode=Codes.BAD_JSON, + ) + def _validate_retention(self, event: EventBase): """Checks that an event that defines the retention policy for a room respects the format enforced by the spec. @@ -185,3 +214,47 @@ class EventValidator: def _ensure_state_event(self, event): if not event.is_state(): raise SynapseError(400, "'%s' must be state events" % (event.type,)) + + +POWER_LEVELS_SCHEMA = { + "type": "object", + "properties": { + "ban": {"$ref": "#/definitions/int"}, + "events": {"$ref": "#/definitions/objectOfInts"}, + "events_default": {"$ref": "#/definitions/int"}, + "invite": {"$ref": "#/definitions/int"}, + "kick": {"$ref": "#/definitions/int"}, + "notifications": {"$ref": "#/definitions/objectOfInts"}, + "redact": {"$ref": "#/definitions/int"}, + "state_default": {"$ref": "#/definitions/int"}, + "users": {"$ref": "#/definitions/objectOfInts"}, + "users_default": {"$ref": "#/definitions/int"}, + }, + "definitions": { + "int": { + "type": "integer", + "minimum": CANONICALJSON_MIN_INT, + "maximum": CANONICALJSON_MAX_INT, + }, + "objectOfInts": { + "type": "object", + "additionalProperties": {"$ref": "#/definitions/int"}, + }, + }, +} + + +def _create_power_level_validator(): + validator = jsonschema.validators.validator_for(POWER_LEVELS_SCHEMA) + + # by default jsonschema does not consider a frozendict to be an object so + # we need to use a custom type checker + # https://python-jsonschema.readthedocs.io/en/stable/validate/?highlight=object#validating-with-additional-types + type_checker = validator.TYPE_CHECKER.redefine( + "object", lambda checker, thing: isinstance(thing, collections.abc.Mapping) + ) + + return jsonschema.validators.extend(validator, type_checker=type_checker) + + +plValidator = _create_power_level_validator() |