2017-12-05 01:29:25 +00:00
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# -*- coding: utf-8 -*-
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# Copyright 2017 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 logging
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from twisted.internet import defer
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2017-12-06 09:02:49 +00:00
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from synapse.api.errors import SynapseError
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from synapse.http.servlet import (
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2017-12-05 21:44:25 +00:00
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RestServlet, parse_json_object_from_request
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)
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from ._base import client_v2_patterns
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logger = logging.getLogger(__name__)
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2017-12-05 17:54:48 +00:00
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class RoomKeysServlet(RestServlet):
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PATTERNS = client_v2_patterns(
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"/room_keys/keys(/(?P<room_id>[^/]+))?(/(?P<session_id>[^/]+))?$"
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)
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2017-12-05 01:29:25 +00:00
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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2017-12-05 21:44:25 +00:00
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super(RoomKeysServlet, self).__init__()
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2017-12-05 01:29:25 +00:00
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self.auth = hs.get_auth()
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self.e2e_room_keys_handler = hs.get_e2e_room_keys_handler()
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@defer.inlineCallbacks
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def on_PUT(self, request, room_id, session_id):
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"""
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Uploads one or more encrypted E2E room keys for backup purposes.
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room_id: the ID of the room the keys are for (optional)
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session_id: the ID for the E2E room keys for the room (optional)
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version: the version of the user's backup which this data is for.
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the version must already have been created via the /change_secret API.
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Each session has:
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* first_message_index: a numeric index indicating the oldest message
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encrypted by this session.
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* forwarded_count: how many times the uploading client claims this key
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has been shared (forwarded)
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* is_verified: whether the client that uploaded the keys claims they
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were sent by a device which they've verified
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* session_data: base64-encrypted data describing the session.
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Returns 200 OK on success with body {}
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The API is designed to be otherwise agnostic to the room_key encryption
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algorithm being used. Sessions are merged with existing ones in the
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backup using the heuristics:
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* is_verified sessions always win over unverified sessions
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* older first_message_index always win over newer sessions
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* lower forwarded_count always wins over higher forwarded_count
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We trust the clients not to lie and corrupt their own backups.
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2017-12-18 01:52:46 +00:00
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It also means that if your access_token is stolen, the attacker could
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delete your backup.
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POST /room_keys/keys/!abc:matrix.org/c0ff33?version=1 HTTP/1.1
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Content-Type: application/json
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{
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"first_message_index": 1,
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"forwarded_count": 1,
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"is_verified": false,
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"session_data": "SSBBTSBBIEZJU0gK"
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}
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Or...
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POST /room_keys/keys/!abc:matrix.org?version=1 HTTP/1.1
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Content-Type: application/json
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{
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"sessions": {
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"c0ff33": {
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"first_message_index": 1,
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"forwarded_count": 1,
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"is_verified": false,
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"session_data": "SSBBTSBBIEZJU0gK"
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}
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}
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}
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Or...
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POST /room_keys/keys?version=1 HTTP/1.1
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Content-Type: application/json
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{
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"rooms": {
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"!abc:matrix.org": {
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"sessions": {
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"c0ff33": {
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"first_message_index": 1,
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"forwarded_count": 1,
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"is_verified": false,
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"session_data": "SSBBTSBBIEZJU0gK"
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}
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}
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}
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}
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}
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"""
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requester = yield self.auth.get_user_by_req(request, allow_guest=False)
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user_id = requester.user.to_string()
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body = parse_json_object_from_request(request)
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version = request.args.get("version")[0]
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if session_id:
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body = {
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"sessions": {
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session_id: body
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}
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}
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if room_id:
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body = {
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"rooms": {
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room_id: body
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}
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}
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2017-12-05 21:44:25 +00:00
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yield self.e2e_room_keys_handler.upload_room_keys(
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user_id, version, body
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)
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defer.returnValue((200, {}))
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2017-12-05 17:54:48 +00:00
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@defer.inlineCallbacks
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def on_GET(self, request, room_id, session_id):
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"""
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Retrieves one or more encrypted E2E room keys for backup purposes.
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Symmetric with the PUT version of the API.
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room_id: the ID of the room to retrieve the keys for (optional)
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session_id: the ID for the E2E room keys to retrieve the keys for (optional)
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version: the version of the user's backup which this data is for.
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the version must already have been created via the /change_secret API.
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Returns as follows:
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GET /room_keys/keys/!abc:matrix.org/c0ff33?version=1 HTTP/1.1
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{
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"first_message_index": 1,
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"forwarded_count": 1,
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"is_verified": false,
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"session_data": "SSBBTSBBIEZJU0gK"
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}
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Or...
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GET /room_keys/keys/!abc:matrix.org?version=1 HTTP/1.1
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{
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"sessions": {
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"c0ff33": {
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"first_message_index": 1,
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"forwarded_count": 1,
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"is_verified": false,
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"session_data": "SSBBTSBBIEZJU0gK"
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}
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}
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}
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Or...
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GET /room_keys/keys?version=1 HTTP/1.1
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{
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"rooms": {
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"!abc:matrix.org": {
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"sessions": {
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"c0ff33": {
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"first_message_index": 1,
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"forwarded_count": 1,
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"is_verified": false,
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"session_data": "SSBBTSBBIEZJU0gK"
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}
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}
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}
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}
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}
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"""
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requester = yield self.auth.get_user_by_req(request, allow_guest=False)
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user_id = requester.user.to_string()
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version = request.args.get("version")[0]
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room_keys = yield self.e2e_room_keys_handler.get_room_keys(
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user_id, version, room_id, session_id
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)
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defer.returnValue((200, room_keys))
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@defer.inlineCallbacks
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def on_DELETE(self, request, room_id, session_id):
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"""
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Deletes one or more encrypted E2E room keys for a user for backup purposes.
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room_id: the ID of the room whose keys to delete (optional)
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session_id: the ID for the E2E session to delete (optional)
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version: the version of the user's backup which this data is for.
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the version must already have been created via the /change_secret API.
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"""
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2017-12-05 17:54:48 +00:00
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requester = yield self.auth.get_user_by_req(request, allow_guest=False)
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user_id = requester.user.to_string()
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version = request.args.get("version")[0]
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yield self.e2e_room_keys_handler.delete_room_keys(
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user_id, version, room_id, session_id
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)
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defer.returnValue((200, {}))
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2017-12-05 01:29:25 +00:00
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2017-12-06 01:02:57 +00:00
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class RoomKeysVersionServlet(RestServlet):
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PATTERNS = client_v2_patterns(
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"/room_keys/version(/(?P<version>[^/]+))?$"
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)
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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super(RoomKeysVersionServlet, self).__init__()
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self.auth = hs.get_auth()
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self.e2e_room_keys_handler = hs.get_e2e_room_keys_handler()
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@defer.inlineCallbacks
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def on_POST(self, request, version):
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if version:
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raise SynapseError(405, "Cannot POST to a specific version")
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2017-12-06 01:02:57 +00:00
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requester = yield self.auth.get_user_by_req(request, allow_guest=False)
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user_id = requester.user.to_string()
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info = parse_json_object_from_request(request)
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new_version = yield self.e2e_room_keys_handler.create_version(
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user_id, info
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)
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defer.returnValue((200, {"version": new_version}))
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2017-12-06 09:02:49 +00:00
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# we deliberately don't have a PUT /version, as these things really should
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# be immutable to avoid people footgunning
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2017-12-06 01:02:57 +00:00
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@defer.inlineCallbacks
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def on_GET(self, request, version):
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requester = yield self.auth.get_user_by_req(request, allow_guest=False)
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user_id = requester.user.to_string()
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info = yield self.e2e_room_keys_handler.get_version_info(
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user_id, version
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)
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defer.returnValue((200, info))
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@defer.inlineCallbacks
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def on_DELETE(self, request, version):
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requester = yield self.auth.get_user_by_req(request, allow_guest=False)
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user_id = requester.user.to_string()
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yield self.e2e_room_keys_handler.delete_version(
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user_id, version
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)
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defer.returnValue((200, {}))
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def register_servlets(hs, http_server):
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RoomKeysServlet(hs).register(http_server)
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RoomKeysVersionServlet(hs).register(http_server)
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