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Merge pull request #4051 from matrix-org/erikj/alias_disallow_list
Add config option to control alias creation
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c85e063302
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changelog.d/4051.feature
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1
changelog.d/4051.feature
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@ -0,0 +1 @@
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Add config option to control alias creation
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@ -31,6 +31,7 @@ from .push import PushConfig
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from .ratelimiting import RatelimitConfig
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from .registration import RegistrationConfig
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from .repository import ContentRepositoryConfig
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from .room_directory import RoomDirectoryConfig
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from .saml2 import SAML2Config
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from .server import ServerConfig
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from .server_notices_config import ServerNoticesConfig
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@ -49,7 +50,7 @@ class HomeServerConfig(TlsConfig, ServerConfig, DatabaseConfig, LoggingConfig,
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WorkerConfig, PasswordAuthProviderConfig, PushConfig,
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SpamCheckerConfig, GroupsConfig, UserDirectoryConfig,
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ConsentConfig,
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ServerNoticesConfig,
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ServerNoticesConfig, RoomDirectoryConfig,
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):
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pass
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102
synapse/config/room_directory.py
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102
synapse/config/room_directory.py
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# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector Ltd
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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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from synapse.util import glob_to_regex
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from ._base import Config, ConfigError
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class RoomDirectoryConfig(Config):
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def read_config(self, config):
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alias_creation_rules = config["alias_creation_rules"]
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self._alias_creation_rules = [
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_AliasRule(rule)
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for rule in alias_creation_rules
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]
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def default_config(self, config_dir_path, server_name, **kwargs):
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return """
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# The `alias_creation` option controls who's allowed to create aliases
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# on this server.
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#
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# The format of this option is a list of rules that contain globs that
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# match against user_id and the new alias (fully qualified with server
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# name). The action in the first rule that matches is taken, which can
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# currently either be "allow" or "deny".
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#
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# If no rules match the request is denied.
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alias_creation_rules:
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- user_id: "*"
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alias: "*"
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action: allow
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"""
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def is_alias_creation_allowed(self, user_id, alias):
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"""Checks if the given user is allowed to create the given alias
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Args:
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user_id (str)
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alias (str)
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Returns:
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boolean: True if user is allowed to crate the alias
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"""
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for rule in self._alias_creation_rules:
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if rule.matches(user_id, alias):
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return rule.action == "allow"
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return False
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class _AliasRule(object):
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def __init__(self, rule):
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action = rule["action"]
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user_id = rule["user_id"]
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alias = rule["alias"]
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if action in ("allow", "deny"):
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self.action = action
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else:
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raise ConfigError(
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"alias_creation_rules rules can only have action of 'allow'"
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" or 'deny'"
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)
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try:
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self._user_id_regex = glob_to_regex(user_id)
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self._alias_regex = glob_to_regex(alias)
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except Exception as e:
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raise ConfigError("Failed to parse glob into regex: %s", e)
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def matches(self, user_id, alias):
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"""Tests if this rule matches the given user_id and alias.
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Args:
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user_id (str)
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alias (str)
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Returns:
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boolean
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"""
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# Note: The regexes are anchored at both ends
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if not self._user_id_regex.match(user_id):
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return False
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if not self._alias_regex.match(alias):
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return False
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return True
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@ -14,7 +14,6 @@
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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 logging
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import re
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import six
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from six import iteritems
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@ -44,6 +43,7 @@ from synapse.replication.http.federation import (
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ReplicationGetQueryRestServlet,
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)
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from synapse.types import get_domain_from_id
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from synapse.util import glob_to_regex
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from synapse.util.async_helpers import Linearizer, concurrently_execute
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from synapse.util.caches.response_cache import ResponseCache
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from synapse.util.logcontext import nested_logging_context
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@ -729,22 +729,10 @@ def _acl_entry_matches(server_name, acl_entry):
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if not isinstance(acl_entry, six.string_types):
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logger.warn("Ignoring non-str ACL entry '%s' (is %s)", acl_entry, type(acl_entry))
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return False
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regex = _glob_to_regex(acl_entry)
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regex = glob_to_regex(acl_entry)
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return regex.match(server_name)
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def _glob_to_regex(glob):
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res = ''
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for c in glob:
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if c == '*':
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res = res + '.*'
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elif c == '?':
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res = res + '.'
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else:
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res = res + re.escape(c)
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return re.compile(res + "\\Z", re.IGNORECASE)
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class FederationHandlerRegistry(object):
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"""Allows classes to register themselves as handlers for a given EDU or
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query type for incoming federation traffic.
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@ -43,6 +43,7 @@ class DirectoryHandler(BaseHandler):
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self.state = hs.get_state_handler()
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self.appservice_handler = hs.get_application_service_handler()
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self.event_creation_handler = hs.get_event_creation_handler()
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self.config = hs.config
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self.federation = hs.get_federation_client()
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hs.get_federation_registry().register_query_handler(
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@ -111,6 +112,14 @@ class DirectoryHandler(BaseHandler):
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403, "This user is not permitted to create this alias",
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)
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if not self.config.is_alias_creation_allowed(user_id, room_alias.to_string()):
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# Lets just return a generic message, as there may be all sorts of
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# reasons why we said no. TODO: Allow configurable error messages
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# per alias creation rule?
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raise SynapseError(
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403, "Not allowed to create alias",
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)
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can_create = yield self.can_modify_alias(
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room_alias,
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user_id=user_id
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@ -14,6 +14,7 @@
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# limitations under the License.
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import logging
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import re
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from itertools import islice
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import attr
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@ -138,3 +139,27 @@ def log_failure(failure, msg, consumeErrors=True):
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if not consumeErrors:
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return failure
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def glob_to_regex(glob):
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"""Converts a glob to a compiled regex object.
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The regex is anchored at the beginning and end of the string.
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Args:
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glob (str)
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Returns:
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re.RegexObject
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"""
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res = ''
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for c in glob:
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if c == '*':
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res = res + '.*'
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elif c == '?':
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res = res + '.'
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else:
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res = res + re.escape(c)
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# \A anchors at start of string, \Z at end of string
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return re.compile(r"\A" + res + r"\Z", re.IGNORECASE)
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67
tests/config/test_room_directory.py
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67
tests/config/test_room_directory.py
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# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector Ltd
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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 yaml
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from synapse.config.room_directory import RoomDirectoryConfig
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from tests import unittest
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class RoomDirectoryConfigTestCase(unittest.TestCase):
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def test_alias_creation_acl(self):
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config = yaml.load("""
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alias_creation_rules:
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- user_id: "*bob*"
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alias: "*"
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action: "deny"
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- user_id: "*"
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alias: "#unofficial_*"
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action: "allow"
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- user_id: "@foo*:example.com"
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alias: "*"
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action: "allow"
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- user_id: "@gah:example.com"
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alias: "#goo:example.com"
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action: "allow"
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""")
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rd_config = RoomDirectoryConfig()
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rd_config.read_config(config)
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self.assertFalse(rd_config.is_alias_creation_allowed(
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user_id="@bob:example.com",
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alias="#test:example.com",
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))
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self.assertTrue(rd_config.is_alias_creation_allowed(
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user_id="@test:example.com",
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alias="#unofficial_st:example.com",
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))
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self.assertTrue(rd_config.is_alias_creation_allowed(
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user_id="@foobar:example.com",
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alias="#test:example.com",
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))
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self.assertTrue(rd_config.is_alias_creation_allowed(
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user_id="@gah:example.com",
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alias="#goo:example.com",
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))
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self.assertFalse(rd_config.is_alias_creation_allowed(
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user_id="@test:example.com",
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alias="#test:example.com",
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))
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@ -18,7 +18,9 @@ from mock import Mock
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from twisted.internet import defer
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from synapse.config.room_directory import RoomDirectoryConfig
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from synapse.handlers.directory import DirectoryHandler
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from synapse.rest.client.v1 import directory, room
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from synapse.types import RoomAlias
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from tests import unittest
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@ -102,3 +104,49 @@ class DirectoryTestCase(unittest.TestCase):
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)
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self.assertEquals({"room_id": "!8765asdf:test", "servers": ["test"]}, response)
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class TestCreateAliasACL(unittest.HomeserverTestCase):
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user_id = "@test:test"
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servlets = [directory.register_servlets, room.register_servlets]
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def prepare(self, hs, reactor, clock):
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# We cheekily override the config to add custom alias creation rules
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config = {}
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config["alias_creation_rules"] = [
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{
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"user_id": "*",
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"alias": "#unofficial_*",
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"action": "allow",
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}
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]
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rd_config = RoomDirectoryConfig()
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rd_config.read_config(config)
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self.hs.config.is_alias_creation_allowed = rd_config.is_alias_creation_allowed
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return hs
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def test_denied(self):
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room_id = self.helper.create_room_as(self.user_id)
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request, channel = self.make_request(
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"PUT",
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b"directory/room/%23test%3Atest",
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('{"room_id":"%s"}' % (room_id,)).encode('ascii'),
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)
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self.render(request)
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self.assertEquals(403, channel.code, channel.result)
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def test_allowed(self):
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room_id = self.helper.create_room_as(self.user_id)
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request, channel = self.make_request(
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"PUT",
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b"directory/room/%23unofficial_test%3Atest",
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('{"room_id":"%s"}' % (room_id,)).encode('ascii'),
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)
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self.render(request)
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self.assertEquals(200, channel.code, channel.result)
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