728 lines
27 KiB
Python
728 lines
27 KiB
Python
# Copyright 2017 New Vector Ltd
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import inspect
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import logging
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from typing import (
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TYPE_CHECKING,
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Any,
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Awaitable,
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Callable,
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Collection,
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Dict,
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List,
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Optional,
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Tuple,
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Union,
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)
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# `Literal` appears with Python 3.8.
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from typing_extensions import Literal
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import synapse
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from synapse.rest.media.v1._base import FileInfo
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from synapse.rest.media.v1.media_storage import ReadableFileWrapper
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from synapse.spam_checker_api import RegistrationBehaviour
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from synapse.types import RoomAlias, UserProfile
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from synapse.util.async_helpers import delay_cancellation, maybe_awaitable
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from synapse.util.metrics import Measure
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if TYPE_CHECKING:
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import synapse.events
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import synapse.server
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logger = logging.getLogger(__name__)
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CHECK_EVENT_FOR_SPAM_CALLBACK = Callable[
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["synapse.events.EventBase"],
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Awaitable[
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Union[
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str,
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"synapse.api.errors.Codes",
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# Highly experimental, not officially part of the spamchecker API, may
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# disappear without warning depending on the results of ongoing
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# experiments.
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# Use this to return additional information as part of an error.
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Tuple["synapse.api.errors.Codes", Dict],
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# Deprecated
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bool,
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]
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],
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]
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SHOULD_DROP_FEDERATED_EVENT_CALLBACK = Callable[
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["synapse.events.EventBase"],
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Awaitable[Union[bool, str]],
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]
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USER_MAY_JOIN_ROOM_CALLBACK = Callable[
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[str, str, bool],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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USER_MAY_INVITE_CALLBACK = Callable[
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[str, str, str],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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USER_MAY_SEND_3PID_INVITE_CALLBACK = Callable[
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[str, str, str, str],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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USER_MAY_CREATE_ROOM_CALLBACK = Callable[
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[str],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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USER_MAY_CREATE_ROOM_ALIAS_CALLBACK = Callable[
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[str, RoomAlias],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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USER_MAY_PUBLISH_ROOM_CALLBACK = Callable[
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[str, str],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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CHECK_USERNAME_FOR_SPAM_CALLBACK = Callable[[UserProfile], Awaitable[bool]]
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LEGACY_CHECK_REGISTRATION_FOR_SPAM_CALLBACK = Callable[
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[
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Optional[dict],
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Optional[str],
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Collection[Tuple[str, str]],
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],
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Awaitable[RegistrationBehaviour],
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]
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CHECK_REGISTRATION_FOR_SPAM_CALLBACK = Callable[
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[
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Optional[dict],
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Optional[str],
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Collection[Tuple[str, str]],
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Optional[str],
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],
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Awaitable[RegistrationBehaviour],
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]
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CHECK_MEDIA_FILE_FOR_SPAM_CALLBACK = Callable[
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[ReadableFileWrapper, FileInfo],
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Awaitable[
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Union[
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Literal["NOT_SPAM"],
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"synapse.api.errors.Codes",
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# Deprecated
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bool,
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]
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],
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]
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def load_legacy_spam_checkers(hs: "synapse.server.HomeServer") -> None:
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"""Wrapper that loads spam checkers configured using the old configuration, and
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registers the spam checker hooks they implement.
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"""
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spam_checkers: List[Any] = []
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api = hs.get_module_api()
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for module, config in hs.config.spamchecker.spam_checkers:
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# Older spam checkers don't accept the `api` argument, so we
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# try and detect support.
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spam_args = inspect.getfullargspec(module)
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if "api" in spam_args.args:
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spam_checkers.append(module(config=config, api=api))
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else:
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spam_checkers.append(module(config=config))
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# The known spam checker hooks. If a spam checker module implements a method
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# which name appears in this set, we'll want to register it.
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spam_checker_methods = {
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"check_event_for_spam",
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"user_may_invite",
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"user_may_create_room",
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"user_may_create_room_alias",
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"user_may_publish_room",
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"check_username_for_spam",
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"check_registration_for_spam",
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"check_media_file_for_spam",
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}
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for spam_checker in spam_checkers:
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# Methods on legacy spam checkers might not be async, so we wrap them around a
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# wrapper that will call maybe_awaitable on the result.
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def async_wrapper(f: Optional[Callable]) -> Optional[Callable[..., Awaitable]]:
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# f might be None if the callback isn't implemented by the module. In this
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# case we don't want to register a callback at all so we return None.
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if f is None:
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return None
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wrapped_func = f
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if f.__name__ == "check_registration_for_spam":
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checker_args = inspect.signature(f)
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if len(checker_args.parameters) == 3:
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# Backwards compatibility; some modules might implement a hook that
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# doesn't expect a 4th argument. In this case, wrap it in a function
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# that gives it only 3 arguments and drops the auth_provider_id on
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# the floor.
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def wrapper(
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email_threepid: Optional[dict],
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username: Optional[str],
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request_info: Collection[Tuple[str, str]],
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auth_provider_id: Optional[str],
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) -> Union[Awaitable[RegistrationBehaviour], RegistrationBehaviour]:
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# Assertion required because mypy can't prove we won't
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# change `f` back to `None`. See
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# https://mypy.readthedocs.io/en/latest/common_issues.html#narrowing-and-inner-functions
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assert f is not None
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return f(
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email_threepid,
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username,
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request_info,
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)
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wrapped_func = wrapper
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elif len(checker_args.parameters) != 4:
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raise RuntimeError(
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"Bad signature for callback check_registration_for_spam",
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)
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def run(*args: Any, **kwargs: Any) -> Awaitable:
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# Assertion required because mypy can't prove we won't change `f`
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# back to `None`. See
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# https://mypy.readthedocs.io/en/latest/common_issues.html#narrowing-and-inner-functions
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assert wrapped_func is not None
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return maybe_awaitable(wrapped_func(*args, **kwargs))
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return run
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# Register the hooks through the module API.
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hooks = {
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hook: async_wrapper(getattr(spam_checker, hook, None))
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for hook in spam_checker_methods
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}
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api.register_spam_checker_callbacks(**hooks)
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class SpamChecker:
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NOT_SPAM: Literal["NOT_SPAM"] = "NOT_SPAM"
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def __init__(self, hs: "synapse.server.HomeServer") -> None:
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self.hs = hs
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self.clock = hs.get_clock()
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self._check_event_for_spam_callbacks: List[CHECK_EVENT_FOR_SPAM_CALLBACK] = []
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self._should_drop_federated_event_callbacks: List[
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SHOULD_DROP_FEDERATED_EVENT_CALLBACK
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] = []
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self._user_may_join_room_callbacks: List[USER_MAY_JOIN_ROOM_CALLBACK] = []
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self._user_may_invite_callbacks: List[USER_MAY_INVITE_CALLBACK] = []
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self._user_may_send_3pid_invite_callbacks: List[
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USER_MAY_SEND_3PID_INVITE_CALLBACK
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] = []
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self._user_may_create_room_callbacks: List[USER_MAY_CREATE_ROOM_CALLBACK] = []
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self._user_may_create_room_alias_callbacks: List[
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USER_MAY_CREATE_ROOM_ALIAS_CALLBACK
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] = []
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self._user_may_publish_room_callbacks: List[USER_MAY_PUBLISH_ROOM_CALLBACK] = []
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self._check_username_for_spam_callbacks: List[
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CHECK_USERNAME_FOR_SPAM_CALLBACK
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] = []
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self._check_registration_for_spam_callbacks: List[
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CHECK_REGISTRATION_FOR_SPAM_CALLBACK
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] = []
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self._check_media_file_for_spam_callbacks: List[
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CHECK_MEDIA_FILE_FOR_SPAM_CALLBACK
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] = []
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def register_callbacks(
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self,
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check_event_for_spam: Optional[CHECK_EVENT_FOR_SPAM_CALLBACK] = None,
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should_drop_federated_event: Optional[
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SHOULD_DROP_FEDERATED_EVENT_CALLBACK
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] = None,
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user_may_join_room: Optional[USER_MAY_JOIN_ROOM_CALLBACK] = None,
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user_may_invite: Optional[USER_MAY_INVITE_CALLBACK] = None,
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user_may_send_3pid_invite: Optional[USER_MAY_SEND_3PID_INVITE_CALLBACK] = None,
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user_may_create_room: Optional[USER_MAY_CREATE_ROOM_CALLBACK] = None,
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user_may_create_room_alias: Optional[
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USER_MAY_CREATE_ROOM_ALIAS_CALLBACK
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] = None,
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user_may_publish_room: Optional[USER_MAY_PUBLISH_ROOM_CALLBACK] = None,
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check_username_for_spam: Optional[CHECK_USERNAME_FOR_SPAM_CALLBACK] = None,
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check_registration_for_spam: Optional[
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CHECK_REGISTRATION_FOR_SPAM_CALLBACK
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] = None,
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check_media_file_for_spam: Optional[CHECK_MEDIA_FILE_FOR_SPAM_CALLBACK] = None,
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) -> None:
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"""Register callbacks from module for each hook."""
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if check_event_for_spam is not None:
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self._check_event_for_spam_callbacks.append(check_event_for_spam)
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if should_drop_federated_event is not None:
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self._should_drop_federated_event_callbacks.append(
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should_drop_federated_event
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)
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if user_may_join_room is not None:
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self._user_may_join_room_callbacks.append(user_may_join_room)
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if user_may_invite is not None:
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self._user_may_invite_callbacks.append(user_may_invite)
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if user_may_send_3pid_invite is not None:
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self._user_may_send_3pid_invite_callbacks.append(
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user_may_send_3pid_invite,
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)
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if user_may_create_room is not None:
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self._user_may_create_room_callbacks.append(user_may_create_room)
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if user_may_create_room_alias is not None:
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self._user_may_create_room_alias_callbacks.append(
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user_may_create_room_alias,
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)
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if user_may_publish_room is not None:
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self._user_may_publish_room_callbacks.append(user_may_publish_room)
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if check_username_for_spam is not None:
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self._check_username_for_spam_callbacks.append(check_username_for_spam)
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if check_registration_for_spam is not None:
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self._check_registration_for_spam_callbacks.append(
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check_registration_for_spam,
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)
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if check_media_file_for_spam is not None:
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self._check_media_file_for_spam_callbacks.append(check_media_file_for_spam)
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async def check_event_for_spam(
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self, event: "synapse.events.EventBase"
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) -> Union[Tuple["synapse.api.errors.Codes", Dict], str]:
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"""Checks if a given event is considered "spammy" by this server.
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If the server considers an event spammy, then it will be rejected if
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sent by a local user. If it is sent by a user on another server, the
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event is soft-failed.
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Args:
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event: the event to be checked
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Returns:
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- `NOT_SPAM` if the event is considered good (non-spammy) and should be let
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through. Other spamcheck filters may still reject it.
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- A `Code` if the event is considered spammy and is rejected with a specific
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error message/code.
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- A string that isn't `NOT_SPAM` if the event is considered spammy and the
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string should be used as the client-facing error message. This usage is
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generally discouraged as it doesn't support internationalization.
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"""
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for callback in self._check_event_for_spam_callbacks:
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with Measure(
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self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
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):
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res = await delay_cancellation(callback(event))
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if res is False or res == self.NOT_SPAM:
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# This spam-checker accepts the event.
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# Other spam-checkers may reject it, though.
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continue
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elif res is True:
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# This spam-checker rejects the event with deprecated
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# return value `True`
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return (synapse.api.errors.Codes.FORBIDDEN, {})
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elif not isinstance(res, str):
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# mypy complains that we can't reach this code because of the
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# return type in CHECK_EVENT_FOR_SPAM_CALLBACK, but we don't know
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# for sure that the module actually returns it.
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logger.warning(
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"Module returned invalid value, rejecting message as spam"
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)
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res = "This message has been rejected as probable spam"
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else:
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# The module rejected the event either with a `Codes`
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# or some other `str`. In either case, we stop here.
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pass
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return res
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# No spam-checker has rejected the event, let it pass.
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return self.NOT_SPAM
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async def should_drop_federated_event(
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self, event: "synapse.events.EventBase"
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) -> Union[bool, str]:
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"""Checks if a given federated event is considered "spammy" by this
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server.
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If the server considers an event spammy, it will be silently dropped,
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and in doing so will split-brain our view of the room's DAG.
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Args:
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event: the event to be checked
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Returns:
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True if the event should be silently dropped
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"""
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for callback in self._should_drop_federated_event_callbacks:
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with Measure(
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self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
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):
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res: Union[bool, str] = await delay_cancellation(callback(event))
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if res:
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return res
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return False
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async def user_may_join_room(
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self, user_id: str, room_id: str, is_invited: bool
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) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
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"""Checks if a given users is allowed to join a room.
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Not called when a user creates a room.
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Args:
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userid: The ID of the user wanting to join the room
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room_id: The ID of the room the user wants to join
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is_invited: Whether the user is invited into the room
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Returns:
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NOT_SPAM if the operation is permitted, Codes otherwise.
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"""
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for callback in self._user_may_join_room_callbacks:
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with Measure(
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self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
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):
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res = await delay_cancellation(callback(user_id, room_id, is_invited))
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# Normalize return values to `Codes` or `"NOT_SPAM"`.
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if res is True or res is self.NOT_SPAM:
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continue
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elif res is False:
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return synapse.api.errors.Codes.FORBIDDEN
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elif isinstance(res, synapse.api.errors.Codes):
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return res
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else:
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logger.warning(
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"Module returned invalid value, rejecting join as spam"
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)
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return synapse.api.errors.Codes.FORBIDDEN
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# No spam-checker has rejected the request, let it pass.
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return self.NOT_SPAM
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async def user_may_invite(
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self, inviter_userid: str, invitee_userid: str, room_id: str
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) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
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"""Checks if a given user may send an invite
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Args:
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inviter_userid: The user ID of the sender of the invitation
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invitee_userid: The user ID targeted in the invitation
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room_id: The room ID
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Returns:
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NOT_SPAM if the operation is permitted, Codes otherwise.
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"""
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for callback in self._user_may_invite_callbacks:
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with Measure(
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self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
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):
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res = await delay_cancellation(
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callback(inviter_userid, invitee_userid, room_id)
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)
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# Normalize return values to `Codes` or `"NOT_SPAM"`.
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if res is True or res is self.NOT_SPAM:
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continue
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elif res is False:
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return synapse.api.errors.Codes.FORBIDDEN
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elif isinstance(res, synapse.api.errors.Codes):
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return res
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else:
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logger.warning(
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"Module returned invalid value, rejecting invite as spam"
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)
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return synapse.api.errors.Codes.FORBIDDEN
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# No spam-checker has rejected the request, let it pass.
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return self.NOT_SPAM
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async def user_may_send_3pid_invite(
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self, inviter_userid: str, medium: str, address: str, room_id: str
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) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
|
|
"""Checks if a given user may invite a given threepid into the room
|
|
|
|
Note that if the threepid is already associated with a Matrix user ID, Synapse
|
|
will call user_may_invite with said user ID instead.
|
|
|
|
Args:
|
|
inviter_userid: The user ID of the sender of the invitation
|
|
medium: The 3PID's medium (e.g. "email")
|
|
address: The 3PID's address (e.g. "alice@example.com")
|
|
room_id: The room ID
|
|
|
|
Returns:
|
|
NOT_SPAM if the operation is permitted, Codes otherwise.
|
|
"""
|
|
for callback in self._user_may_send_3pid_invite_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
res = await delay_cancellation(
|
|
callback(inviter_userid, medium, address, room_id)
|
|
)
|
|
# Normalize return values to `Codes` or `"NOT_SPAM"`.
|
|
if res is True or res is self.NOT_SPAM:
|
|
continue
|
|
elif res is False:
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
elif isinstance(res, synapse.api.errors.Codes):
|
|
return res
|
|
else:
|
|
logger.warning(
|
|
"Module returned invalid value, rejecting 3pid invite as spam"
|
|
)
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
|
|
return self.NOT_SPAM
|
|
|
|
async def user_may_create_room(
|
|
self, userid: str
|
|
) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
|
|
"""Checks if a given user may create a room
|
|
|
|
Args:
|
|
userid: The ID of the user attempting to create a room
|
|
"""
|
|
for callback in self._user_may_create_room_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
res = await delay_cancellation(callback(userid))
|
|
if res is True or res is self.NOT_SPAM:
|
|
continue
|
|
elif res is False:
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
elif isinstance(res, synapse.api.errors.Codes):
|
|
return res
|
|
else:
|
|
logger.warning(
|
|
"Module returned invalid value, rejecting room creation as spam"
|
|
)
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
|
|
return self.NOT_SPAM
|
|
|
|
async def user_may_create_room_alias(
|
|
self, userid: str, room_alias: RoomAlias
|
|
) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
|
|
"""Checks if a given user may create a room alias
|
|
|
|
Args:
|
|
userid: The ID of the user attempting to create a room alias
|
|
room_alias: The alias to be created
|
|
|
|
"""
|
|
for callback in self._user_may_create_room_alias_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
res = await delay_cancellation(callback(userid, room_alias))
|
|
if res is True or res is self.NOT_SPAM:
|
|
continue
|
|
elif res is False:
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
elif isinstance(res, synapse.api.errors.Codes):
|
|
return res
|
|
else:
|
|
logger.warning(
|
|
"Module returned invalid value, rejecting room create as spam"
|
|
)
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
|
|
return self.NOT_SPAM
|
|
|
|
async def user_may_publish_room(
|
|
self, userid: str, room_id: str
|
|
) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
|
|
"""Checks if a given user may publish a room to the directory
|
|
|
|
Args:
|
|
userid: The user ID attempting to publish the room
|
|
room_id: The ID of the room that would be published
|
|
"""
|
|
for callback in self._user_may_publish_room_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
res = await delay_cancellation(callback(userid, room_id))
|
|
if res is True or res is self.NOT_SPAM:
|
|
continue
|
|
elif res is False:
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
elif isinstance(res, synapse.api.errors.Codes):
|
|
return res
|
|
else:
|
|
logger.warning(
|
|
"Module returned invalid value, rejecting room publication as spam"
|
|
)
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
|
|
return self.NOT_SPAM
|
|
|
|
async def check_username_for_spam(self, user_profile: UserProfile) -> bool:
|
|
"""Checks if a user ID or display name are considered "spammy" by this server.
|
|
|
|
If the server considers a username spammy, then it will not be included in
|
|
user directory results.
|
|
|
|
Args:
|
|
user_profile: The user information to check, it contains the keys:
|
|
* user_id
|
|
* display_name
|
|
* avatar_url
|
|
|
|
Returns:
|
|
True if the user is spammy.
|
|
"""
|
|
for callback in self._check_username_for_spam_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
# Make a copy of the user profile object to ensure the spam checker cannot
|
|
# modify it.
|
|
res = await delay_cancellation(callback(user_profile.copy()))
|
|
if res:
|
|
return True
|
|
|
|
return False
|
|
|
|
async def check_registration_for_spam(
|
|
self,
|
|
email_threepid: Optional[dict],
|
|
username: Optional[str],
|
|
request_info: Collection[Tuple[str, str]],
|
|
auth_provider_id: Optional[str] = None,
|
|
) -> RegistrationBehaviour:
|
|
"""Checks if we should allow the given registration request.
|
|
|
|
Args:
|
|
email_threepid: The email threepid used for registering, if any
|
|
username: The request user name, if any
|
|
request_info: List of tuples of user agent and IP that
|
|
were used during the registration process.
|
|
auth_provider_id: The SSO IdP the user used, e.g "oidc", "saml",
|
|
"cas". If any. Note this does not include users registered
|
|
via a password provider.
|
|
|
|
Returns:
|
|
Enum for how the request should be handled
|
|
"""
|
|
|
|
for callback in self._check_registration_for_spam_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
behaviour = await delay_cancellation(
|
|
callback(email_threepid, username, request_info, auth_provider_id)
|
|
)
|
|
assert isinstance(behaviour, RegistrationBehaviour)
|
|
if behaviour != RegistrationBehaviour.ALLOW:
|
|
return behaviour
|
|
|
|
return RegistrationBehaviour.ALLOW
|
|
|
|
async def check_media_file_for_spam(
|
|
self, file_wrapper: ReadableFileWrapper, file_info: FileInfo
|
|
) -> Union["synapse.api.errors.Codes", Literal["NOT_SPAM"]]:
|
|
"""Checks if a piece of newly uploaded media should be blocked.
|
|
|
|
This will be called for local uploads, downloads of remote media, each
|
|
thumbnail generated for those, and web pages/images used for URL
|
|
previews.
|
|
|
|
Note that care should be taken to not do blocking IO operations in the
|
|
main thread. For example, to get the contents of a file a module
|
|
should do::
|
|
|
|
async def check_media_file_for_spam(
|
|
self, file: ReadableFileWrapper, file_info: FileInfo
|
|
) -> Union[Codes, Literal["NOT_SPAM"]]:
|
|
buffer = BytesIO()
|
|
await file.write_chunks_to(buffer.write)
|
|
|
|
if buffer.getvalue() == b"Hello World":
|
|
return synapse.module_api.NOT_SPAM
|
|
|
|
return Codes.FORBIDDEN
|
|
|
|
|
|
Args:
|
|
file: An object that allows reading the contents of the media.
|
|
file_info: Metadata about the file.
|
|
"""
|
|
|
|
for callback in self._check_media_file_for_spam_callbacks:
|
|
with Measure(
|
|
self.clock, "{}.{}".format(callback.__module__, callback.__qualname__)
|
|
):
|
|
res = await delay_cancellation(callback(file_wrapper, file_info))
|
|
# Normalize return values to `Codes` or `"NOT_SPAM"`.
|
|
if res is False or res is self.NOT_SPAM:
|
|
continue
|
|
elif res is True:
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
elif isinstance(res, synapse.api.errors.Codes):
|
|
return res
|
|
else:
|
|
logger.warning(
|
|
"Module returned invalid value, rejecting media file as spam"
|
|
)
|
|
return synapse.api.errors.Codes.FORBIDDEN
|
|
|
|
return self.NOT_SPAM
|