445 lines
16 KiB
Python
445 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 New Vector Ltd
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# Copyright 2019 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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from typing import Optional
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from synapse.api.errors import StoreError
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from synapse.logging.opentracing import log_kv, trace
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from synapse.storage._base import SQLBaseStore, db_to_json
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from synapse.util import json_encoder
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class EndToEndRoomKeyStore(SQLBaseStore):
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async def update_e2e_room_key(
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self, user_id, version, room_id, session_id, room_key
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):
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"""Replaces the encrypted E2E room key for a given session in a given backup
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Args:
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user_id(str): the user whose backup we're setting
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version(str): the version ID of the backup we're updating
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room_id(str): the ID of the room whose keys we're setting
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session_id(str): the session whose room_key we're setting
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room_key(dict): the room_key being set
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Raises:
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StoreError
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"""
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await self.db_pool.simple_update_one(
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table="e2e_room_keys",
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keyvalues={
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"user_id": user_id,
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"version": version,
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"room_id": room_id,
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"session_id": session_id,
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},
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updatevalues={
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"first_message_index": room_key["first_message_index"],
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"forwarded_count": room_key["forwarded_count"],
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"is_verified": room_key["is_verified"],
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"session_data": json_encoder.encode(room_key["session_data"]),
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},
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desc="update_e2e_room_key",
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)
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async def add_e2e_room_keys(self, user_id, version, room_keys):
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"""Bulk add room keys to a given backup.
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Args:
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user_id (str): the user whose backup we're adding to
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version (str): the version ID of the backup for the set of keys we're adding to
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room_keys (iterable[(str, str, dict)]): the keys to add, in the form
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(roomID, sessionID, keyData)
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"""
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values = []
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for (room_id, session_id, room_key) in room_keys:
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values.append(
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{
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"user_id": user_id,
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"version": version,
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"room_id": room_id,
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"session_id": session_id,
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"first_message_index": room_key["first_message_index"],
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"forwarded_count": room_key["forwarded_count"],
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"is_verified": room_key["is_verified"],
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"session_data": json_encoder.encode(room_key["session_data"]),
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}
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)
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log_kv(
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{
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"message": "Set room key",
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"room_id": room_id,
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"session_id": session_id,
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"room_key": room_key,
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}
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)
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await self.db_pool.simple_insert_many(
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table="e2e_room_keys", values=values, desc="add_e2e_room_keys"
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)
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@trace
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async def get_e2e_room_keys(self, user_id, version, room_id=None, session_id=None):
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"""Bulk get the E2E room keys for a given backup, optionally filtered to a given
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room, or a given session.
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Args:
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user_id (str): the user whose backup we're querying
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version (str): the version ID of the backup for the set of keys we're querying
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room_id (str): Optional. the ID of the room whose keys we're querying, if any.
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If not specified, we return the keys for all the rooms in the backup.
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session_id (str): Optional. the session whose room_key we're querying, if any.
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If specified, we also require the room_id to be specified.
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If not specified, we return all the keys in this version of
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the backup (or for the specified room)
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Returns:
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A list of dicts giving the session_data and message metadata for
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these room keys.
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"""
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try:
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version = int(version)
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except ValueError:
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return {"rooms": {}}
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keyvalues = {"user_id": user_id, "version": version}
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if room_id:
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keyvalues["room_id"] = room_id
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if session_id:
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keyvalues["session_id"] = session_id
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rows = await self.db_pool.simple_select_list(
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table="e2e_room_keys",
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keyvalues=keyvalues,
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retcols=(
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"user_id",
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"room_id",
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"session_id",
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"first_message_index",
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"forwarded_count",
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"is_verified",
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"session_data",
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),
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desc="get_e2e_room_keys",
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)
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sessions = {"rooms": {}}
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for row in rows:
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room_entry = sessions["rooms"].setdefault(row["room_id"], {"sessions": {}})
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room_entry["sessions"][row["session_id"]] = {
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"first_message_index": row["first_message_index"],
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"forwarded_count": row["forwarded_count"],
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# is_verified must be returned to the client as a boolean
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"is_verified": bool(row["is_verified"]),
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"session_data": db_to_json(row["session_data"]),
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}
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return sessions
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async def get_e2e_room_keys_multi(self, user_id, version, room_keys):
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"""Get multiple room keys at a time. The difference between this function and
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get_e2e_room_keys is that this function can be used to retrieve
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multiple specific keys at a time, whereas get_e2e_room_keys is used for
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getting all the keys in a backup version, all the keys for a room, or a
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specific key.
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Args:
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user_id (str): the user whose backup we're querying
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version (str): the version ID of the backup we're querying about
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room_keys (dict[str, dict[str, iterable[str]]]): a map from
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room ID -> {"session": [session ids]} indicating the session IDs
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that we want to query
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Returns:
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dict[str, dict[str, dict]]: a map of room IDs to session IDs to room key
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"""
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return await self.db_pool.runInteraction(
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"get_e2e_room_keys_multi",
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self._get_e2e_room_keys_multi_txn,
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user_id,
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version,
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room_keys,
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)
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@staticmethod
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def _get_e2e_room_keys_multi_txn(txn, user_id, version, room_keys):
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if not room_keys:
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return {}
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where_clauses = []
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params = [user_id, version]
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for room_id, room in room_keys.items():
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sessions = list(room["sessions"])
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if not sessions:
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continue
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params.append(room_id)
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params.extend(sessions)
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where_clauses.append(
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"(room_id = ? AND session_id IN (%s))"
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% (",".join(["?" for _ in sessions]),)
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)
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# check if we're actually querying something
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if not where_clauses:
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return {}
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sql = """
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SELECT room_id, session_id, first_message_index, forwarded_count,
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is_verified, session_data
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FROM e2e_room_keys
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WHERE user_id = ? AND version = ? AND (%s)
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""" % (
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" OR ".join(where_clauses)
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)
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txn.execute(sql, params)
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ret = {}
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for row in txn:
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room_id = row[0]
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session_id = row[1]
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ret.setdefault(room_id, {})
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ret[room_id][session_id] = {
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"first_message_index": row[2],
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"forwarded_count": row[3],
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"is_verified": row[4],
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"session_data": db_to_json(row[5]),
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}
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return ret
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async def count_e2e_room_keys(self, user_id: str, version: str) -> int:
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"""Get the number of keys in a backup version.
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Args:
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user_id: the user whose backup we're querying
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version: the version ID of the backup we're querying about
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"""
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return await self.db_pool.simple_select_one_onecol(
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table="e2e_room_keys",
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keyvalues={"user_id": user_id, "version": version},
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retcol="COUNT(*)",
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desc="count_e2e_room_keys",
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)
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@trace
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async def delete_e2e_room_keys(
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self, user_id, version, room_id=None, session_id=None
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):
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"""Bulk delete the E2E room keys for a given backup, optionally filtered to a given
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room or a given session.
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Args:
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user_id(str): the user whose backup we're deleting from
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version(str): the version ID of the backup for the set of keys we're deleting
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room_id(str): Optional. the ID of the room whose keys we're deleting, if any.
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If not specified, we delete the keys for all the rooms in the backup.
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session_id(str): Optional. the session whose room_key we're querying, if any.
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If specified, we also require the room_id to be specified.
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If not specified, we delete all the keys in this version of
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the backup (or for the specified room)
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Returns:
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The deletion transaction
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"""
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keyvalues = {"user_id": user_id, "version": int(version)}
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if room_id:
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keyvalues["room_id"] = room_id
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if session_id:
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keyvalues["session_id"] = session_id
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await self.db_pool.simple_delete(
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table="e2e_room_keys", keyvalues=keyvalues, desc="delete_e2e_room_keys"
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)
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@staticmethod
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def _get_current_version(txn, user_id):
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txn.execute(
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"SELECT MAX(version) FROM e2e_room_keys_versions "
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"WHERE user_id=? AND deleted=0",
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(user_id,),
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)
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row = txn.fetchone()
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if not row:
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raise StoreError(404, "No current backup version")
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return row[0]
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async def get_e2e_room_keys_version_info(self, user_id, version=None):
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"""Get info metadata about a version of our room_keys backup.
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Args:
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user_id(str): the user whose backup we're querying
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version(str): Optional. the version ID of the backup we're querying about
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If missing, we return the information about the current version.
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Raises:
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StoreError: with code 404 if there are no e2e_room_keys_versions present
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Returns:
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A dict giving the info metadata for this backup version, with
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fields including:
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version(str)
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algorithm(str)
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auth_data(object): opaque dict supplied by the client
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etag(int): tag of the keys in the backup
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"""
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def _get_e2e_room_keys_version_info_txn(txn):
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if version is None:
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this_version = self._get_current_version(txn, user_id)
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else:
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try:
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this_version = int(version)
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except ValueError:
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# Our versions are all ints so if we can't convert it to an integer,
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# it isn't there.
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raise StoreError(404, "No row found")
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result = self.db_pool.simple_select_one_txn(
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txn,
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table="e2e_room_keys_versions",
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keyvalues={"user_id": user_id, "version": this_version, "deleted": 0},
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retcols=("version", "algorithm", "auth_data", "etag"),
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)
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result["auth_data"] = db_to_json(result["auth_data"])
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result["version"] = str(result["version"])
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if result["etag"] is None:
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result["etag"] = 0
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return result
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return await self.db_pool.runInteraction(
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"get_e2e_room_keys_version_info", _get_e2e_room_keys_version_info_txn
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)
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@trace
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async def create_e2e_room_keys_version(self, user_id: str, info: dict) -> str:
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"""Atomically creates a new version of this user's e2e_room_keys store
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with the given version info.
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Args:
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user_id(str): the user whose backup we're creating a version
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info(dict): the info about the backup version to be created
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Returns:
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The newly created version ID
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"""
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def _create_e2e_room_keys_version_txn(txn):
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txn.execute(
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"SELECT MAX(version) FROM e2e_room_keys_versions WHERE user_id=?",
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(user_id,),
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)
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current_version = txn.fetchone()[0]
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if current_version is None:
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current_version = "0"
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new_version = str(int(current_version) + 1)
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self.db_pool.simple_insert_txn(
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txn,
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table="e2e_room_keys_versions",
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values={
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"user_id": user_id,
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"version": new_version,
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"algorithm": info["algorithm"],
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"auth_data": json_encoder.encode(info["auth_data"]),
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},
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)
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return new_version
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return await self.db_pool.runInteraction(
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"create_e2e_room_keys_version_txn", _create_e2e_room_keys_version_txn
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)
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@trace
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async def update_e2e_room_keys_version(
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self,
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user_id: str,
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version: str,
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info: Optional[dict] = None,
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version_etag: Optional[int] = None,
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) -> None:
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"""Update a given backup version
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Args:
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user_id: the user whose backup version we're updating
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version: the version ID of the backup version we're updating
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info: the new backup version info to store. If None, then the backup
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version info is not updated.
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version_etag: etag of the keys in the backup. If None, then the etag
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is not updated.
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"""
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updatevalues = {}
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if info is not None and "auth_data" in info:
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updatevalues["auth_data"] = json_encoder.encode(info["auth_data"])
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if version_etag is not None:
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updatevalues["etag"] = version_etag
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if updatevalues:
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await self.db_pool.simple_update(
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table="e2e_room_keys_versions",
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keyvalues={"user_id": user_id, "version": version},
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updatevalues=updatevalues,
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desc="update_e2e_room_keys_version",
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)
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@trace
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async def delete_e2e_room_keys_version(
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self, user_id: str, version: Optional[str] = None
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) -> None:
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"""Delete a given backup version of the user's room keys.
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Doesn't delete their actual key data.
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Args:
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user_id: the user whose backup version we're deleting
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version: Optional. the version ID of the backup version we're deleting
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If missing, we delete the current backup version info.
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Raises:
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StoreError: with code 404 if there are no e2e_room_keys_versions present,
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or if the version requested doesn't exist.
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"""
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def _delete_e2e_room_keys_version_txn(txn):
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if version is None:
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this_version = self._get_current_version(txn, user_id)
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if this_version is None:
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raise StoreError(404, "No current backup version")
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else:
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this_version = version
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self.db_pool.simple_delete_txn(
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txn,
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table="e2e_room_keys",
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keyvalues={"user_id": user_id, "version": this_version},
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)
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self.db_pool.simple_update_one_txn(
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txn,
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table="e2e_room_keys_versions",
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keyvalues={"user_id": user_id, "version": this_version},
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updatevalues={"deleted": 1},
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)
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await self.db_pool.runInteraction(
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"delete_e2e_room_keys_version", _delete_e2e_room_keys_version_txn
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)
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