From fcd69614411428fae1072704978a349e8c28be3d Mon Sep 17 00:00:00 2001 From: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com> Date: Wed, 10 Jun 2020 17:44:34 +0100 Subject: Add option to enable encryption by default for new rooms (#7639) Fixes https://github.com/matrix-org/synapse/issues/2431 Adds config option `encryption_enabled_by_default_for_room_type`, which determines whether encryption should be enabled with the default encryption algorithm in private or public rooms upon creation. Whether the room is private or public is decided based upon the room creation preset that is used. Part of this PR is also pulling out all of the individual instances of `m.megolm.v1.aes-sha2` into a constant variable to eliminate typos ala https://github.com/matrix-org/synapse/pull/7637 Based on #7637 --- synapse/api/constants.py | 5 +++ synapse/config/homeserver.py | 2 ++ synapse/config/room.py | 80 ++++++++++++++++++++++++++++++++++++++++++ synapse/handlers/federation.py | 12 +++++-- synapse/handlers/room.py | 74 ++++++++++++++++++++++++-------------- 5 files changed, 144 insertions(+), 29 deletions(-) create mode 100644 synapse/config/room.py (limited to 'synapse') diff --git a/synapse/api/constants.py b/synapse/api/constants.py index 5ec4a77ccd..6a6d32c302 100644 --- a/synapse/api/constants.py +++ b/synapse/api/constants.py @@ -150,3 +150,8 @@ class EventContentFields(object): # Timestamp to delete the event after # cf https://github.com/matrix-org/matrix-doc/pull/2228 SELF_DESTRUCT_AFTER = "org.matrix.self_destruct_after" + + +class RoomEncryptionAlgorithms(object): + MEGOLM_V1_AES_SHA2 = "m.megolm.v1.aes-sha2" + DEFAULT = MEGOLM_V1_AES_SHA2 diff --git a/synapse/config/homeserver.py b/synapse/config/homeserver.py index 2c7b3a699f..264c274c52 100644 --- a/synapse/config/homeserver.py +++ b/synapse/config/homeserver.py @@ -36,6 +36,7 @@ from .ratelimiting import RatelimitConfig from .redis import RedisConfig from .registration import RegistrationConfig from .repository import ContentRepositoryConfig +from .room import RoomConfig from .room_directory import RoomDirectoryConfig from .saml2_config import SAML2Config from .server import ServerConfig @@ -79,6 +80,7 @@ class HomeServerConfig(RootConfig): PasswordAuthProviderConfig, PushConfig, SpamCheckerConfig, + RoomConfig, GroupsConfig, UserDirectoryConfig, ConsentConfig, diff --git a/synapse/config/room.py b/synapse/config/room.py new file mode 100644 index 0000000000..6aa4de0672 --- /dev/null +++ b/synapse/config/room.py @@ -0,0 +1,80 @@ +# -*- coding: utf-8 -*- +# Copyright 2020 The Matrix.org Foundation C.I.C. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# 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 logging + +from synapse.api.constants import RoomCreationPreset + +from ._base import Config, ConfigError + +logger = logging.Logger(__name__) + + +class RoomDefaultEncryptionTypes(object): + """Possible values for the encryption_enabled_by_default_for_room_type config option""" + + ALL = "all" + INVITE = "invite" + OFF = "off" + + +class RoomConfig(Config): + section = "room" + + def read_config(self, config, **kwargs): + # Whether new, locally-created rooms should have encryption enabled + encryption_for_room_type = config.get( + "encryption_enabled_by_default_for_room_type", + RoomDefaultEncryptionTypes.OFF, + ) + if encryption_for_room_type == RoomDefaultEncryptionTypes.ALL: + self.encryption_enabled_by_default_for_room_presets = [ + RoomCreationPreset.PRIVATE_CHAT, + RoomCreationPreset.TRUSTED_PRIVATE_CHAT, + RoomCreationPreset.PUBLIC_CHAT, + ] + elif encryption_for_room_type == RoomDefaultEncryptionTypes.INVITE: + self.encryption_enabled_by_default_for_room_presets = [ + RoomCreationPreset.PRIVATE_CHAT, + RoomCreationPreset.TRUSTED_PRIVATE_CHAT, + ] + elif encryption_for_room_type == RoomDefaultEncryptionTypes.OFF: + self.encryption_enabled_by_default_for_room_presets = [] + else: + raise ConfigError( + "Invalid value for encryption_enabled_by_default_for_room_type" + ) + + def generate_config_section(self, **kwargs): + return """\ + ## Rooms ## + + # Controls whether locally-created rooms should be end-to-end encrypted by + # default. + # + # Possible options are "all", "invite", and "off". They are defined as: + # + # * "all": any locally-created room + # * "invite": any room created with the "private_chat" or "trusted_private_chat" + # room creation presets + # * "off": this option will take no effect + # + # The default value is "off". + # + # Note that this option will only affect rooms created after it is set. It + # will also not affect rooms created by other servers. + # + #encryption_enabled_by_default_for_room_type: invite + """ diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py index 3e60774b33..b30f41dc4b 100644 --- a/synapse/handlers/federation.py +++ b/synapse/handlers/federation.py @@ -33,7 +33,12 @@ from unpaddedbase64 import decode_base64 from twisted.internet import defer from synapse import event_auth -from synapse.api.constants import EventTypes, Membership, RejectedReason +from synapse.api.constants import ( + EventTypes, + Membership, + RejectedReason, + RoomEncryptionAlgorithms, +) from synapse.api.errors import ( AuthError, CodeMessageException, @@ -742,7 +747,10 @@ class FederationHandler(BaseHandler): if device: keys = device.get("keys", {}).get("keys", {}) - if event.content.get("algorithm") == "m.megolm.v1.aes-sha2": + if ( + event.content.get("algorithm") + == RoomEncryptionAlgorithms.MEGOLM_V1_AES_SHA2 + ): # For this algorithm we expect a curve25519 key. key_name = "curve25519:%s" % (device_id,) current_keys = [keys.get(key_name)] diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py index 61db3ccc43..46c2739143 100644 --- a/synapse/handlers/room.py +++ b/synapse/handlers/room.py @@ -26,7 +26,12 @@ from typing import Tuple from six import iteritems, string_types -from synapse.api.constants import EventTypes, JoinRules, RoomCreationPreset +from synapse.api.constants import ( + EventTypes, + JoinRules, + RoomCreationPreset, + RoomEncryptionAlgorithms, +) from synapse.api.errors import AuthError, Codes, NotFoundError, StoreError, SynapseError from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion from synapse.events.utils import copy_power_levels_contents @@ -56,31 +61,6 @@ FIVE_MINUTES_IN_MS = 5 * 60 * 1000 class RoomCreationHandler(BaseHandler): - - PRESETS_DICT = { - RoomCreationPreset.PRIVATE_CHAT: { - "join_rules": JoinRules.INVITE, - "history_visibility": "shared", - "original_invitees_have_ops": False, - "guest_can_join": True, - "power_level_content_override": {"invite": 0}, - }, - RoomCreationPreset.TRUSTED_PRIVATE_CHAT: { - "join_rules": JoinRules.INVITE, - "history_visibility": "shared", - "original_invitees_have_ops": True, - "guest_can_join": True, - "power_level_content_override": {"invite": 0}, - }, - RoomCreationPreset.PUBLIC_CHAT: { - "join_rules": JoinRules.PUBLIC, - "history_visibility": "shared", - "original_invitees_have_ops": False, - "guest_can_join": False, - "power_level_content_override": {}, - }, - } - def __init__(self, hs): super(RoomCreationHandler, self).__init__(hs) @@ -89,6 +69,39 @@ class RoomCreationHandler(BaseHandler): self.room_member_handler = hs.get_room_member_handler() self.config = hs.config + # Room state based off defined presets + self._presets_dict = { + RoomCreationPreset.PRIVATE_CHAT: { + "join_rules": JoinRules.INVITE, + "history_visibility": "shared", + "original_invitees_have_ops": False, + "guest_can_join": True, + "power_level_content_override": {"invite": 0}, + }, + RoomCreationPreset.TRUSTED_PRIVATE_CHAT: { + "join_rules": JoinRules.INVITE, + "history_visibility": "shared", + "original_invitees_have_ops": True, + "guest_can_join": True, + "power_level_content_override": {"invite": 0}, + }, + RoomCreationPreset.PUBLIC_CHAT: { + "join_rules": JoinRules.PUBLIC, + "history_visibility": "shared", + "original_invitees_have_ops": False, + "guest_can_join": False, + "power_level_content_override": {}, + }, + } + + # Modify presets to selectively enable encryption by default per homeserver config + for preset_name, preset_config in self._presets_dict.items(): + encrypted = ( + preset_name + in self.config.encryption_enabled_by_default_for_room_presets + ) + preset_config["encrypted"] = encrypted + self._replication = hs.get_replication_data_handler() # linearizer to stop two upgrades happening at once @@ -798,7 +811,7 @@ class RoomCreationHandler(BaseHandler): ) return last_stream_id - config = RoomCreationHandler.PRESETS_DICT[preset_config] + config = self._presets_dict[preset_config] creator_id = creator.user.to_string() @@ -888,6 +901,13 @@ class RoomCreationHandler(BaseHandler): etype=etype, state_key=state_key, content=content ) + if config["encrypted"]: + last_sent_stream_id = await send( + etype=EventTypes.RoomEncryption, + state_key="", + content={"algorithm": RoomEncryptionAlgorithms.DEFAULT}, + ) + return last_sent_stream_id async def _generate_room_id( -- cgit 1.4.1