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d8cc86eff4
Remove type hints from comments which have been added as Python type hints. This helps avoid drift between comments and reality, as well as removing redundant information. Also adds some missing type hints which were simple to fill in.
553 lines
20 KiB
Python
553 lines
20 KiB
Python
# 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 Dict, Iterable, Mapping, Optional, Tuple, cast
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from typing_extensions import Literal, TypedDict
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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.storage.database import LoggingTransaction
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from synapse.types import JsonDict, JsonSerializable, StreamKeyType
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from synapse.util import json_encoder
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class RoomKey(TypedDict):
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"""`KeyBackupData` in the Matrix spec.
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https://spec.matrix.org/v1.1/client-server-api/#get_matrixclientv3room_keyskeysroomidsessionid
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"""
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first_message_index: int
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forwarded_count: int
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is_verified: bool
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session_data: JsonSerializable
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class EndToEndRoomKeyStore(SQLBaseStore):
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"""The store for end to end room key backups.
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See https://spec.matrix.org/v1.1/client-server-api/#server-side-key-backups
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As per the spec, backups are identified by an opaque version string. Internally,
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version identifiers are assigned using incrementing integers. Non-numeric version
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strings are treated as if they do not exist, since we would have never issued them.
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"""
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async def update_e2e_room_key(
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self,
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user_id: str,
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version: str,
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room_id: str,
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session_id: str,
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room_key: RoomKey,
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) -> None:
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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: the user whose backup we're setting
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version: the version ID of the backup we're updating
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room_id: the ID of the room whose keys we're setting
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session_id: the session whose room_key we're setting
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room_key: the room_key being set
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Raises:
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StoreError
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"""
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try:
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version_int = 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 doesn't exist.
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raise StoreError(404, "No backup with that version exists")
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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_int,
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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(
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self, user_id: str, version: str, room_keys: Iterable[Tuple[str, str, RoomKey]]
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) -> None:
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"""Bulk add room keys to a given backup.
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Args:
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user_id: the user whose backup we're adding to
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version: the version ID of the backup for the set of keys we're adding to
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room_keys: the keys to add, in the form (roomID, sessionID, keyData)
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"""
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try:
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version_int = 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 doesn't exist.
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raise StoreError(404, "No backup with that version exists")
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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,
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version_int,
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room_id,
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session_id,
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room_key["first_message_index"],
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room_key["forwarded_count"],
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room_key["is_verified"],
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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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StreamKeyType.ROOM: 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",
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keys=(
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"user_id",
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"version",
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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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values=values,
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desc="add_e2e_room_keys",
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)
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@trace
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async def get_e2e_room_keys(
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self,
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user_id: str,
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version: str,
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room_id: Optional[str] = None,
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session_id: Optional[str] = None,
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) -> Dict[
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Literal["rooms"], Dict[str, Dict[Literal["sessions"], Dict[str, RoomKey]]]
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]:
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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: the user whose backup we're querying
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version: the version ID of the backup for the set of keys we're querying
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room_id: 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: 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 dict giving the session_data and message metadata for these room keys.
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`{"rooms": {room_id: {"sessions": {session_id: room_key}}}}`
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"""
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try:
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version_int = 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_int}
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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: Dict[
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Literal["rooms"], Dict[str, Dict[Literal["sessions"], Dict[str, RoomKey]]]
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] = {"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(
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self,
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user_id: str,
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version: str,
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room_keys: Mapping[str, Mapping[Literal["sessions"], Iterable[str]]],
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) -> Dict[str, Dict[str, RoomKey]]:
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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: 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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room_keys: a map from room ID -> {"sessions": [session ids]}
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indicating the session IDs that we want to query
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Returns:
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A map of room IDs to session IDs to room key
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"""
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try:
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version_int = 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 doesn't exist.
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return {}
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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_int,
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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(
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txn: LoggingTransaction,
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user_id: str,
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version: int,
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room_keys: Mapping[str, Mapping[Literal["sessions"], Iterable[str]]],
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) -> Dict[str, Dict[str, RoomKey]]:
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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: Dict[str, Dict[str, RoomKey]] = {}
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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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try:
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version_int = 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 doesn't exist.
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return 0
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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_int},
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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,
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user_id: str,
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version: str,
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room_id: Optional[str] = None,
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session_id: Optional[str] = None,
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) -> None:
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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: the user whose backup we're deleting from
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version: the version ID of the backup for the set of keys we're deleting
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room_id: 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: 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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"""
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try:
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version_int = 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 doesn't exist.
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return
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keyvalues = {"user_id": user_id, "version": version_int}
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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: LoggingTransaction, user_id: str) -> int:
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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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# `SELECT MAX() FROM ...` will always return 1 row. The value in that row will
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# be `NULL` when there are no available versions.
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row = cast(Tuple[Optional[int]], txn.fetchone())
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if row[0] is None:
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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(
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self, user_id: str, version: Optional[str] = None
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) -> JsonDict:
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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: the user whose backup we're querying
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version: 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: LoggingTransaction) -> JsonDict:
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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 backup with that version exists")
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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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allow_none=False,
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)
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assert result is not None # see comment on `simple_select_one_txn`
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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: JsonDict) -> 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: the user whose backup we're creating a version
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info: 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: LoggingTransaction) -> str:
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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 = cast(Tuple[Optional[int]], 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 = 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 str(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[JsonDict] = 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: Dict[str, object] = {}
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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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try:
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version_int = 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 doesn't exist.
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raise StoreError(404, "No backup with that version exists")
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await self.db_pool.simple_update_one(
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table="e2e_room_keys_versions",
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keyvalues={"user_id": user_id, "version": version_int},
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|
updatevalues=updatevalues,
|
|
desc="update_e2e_room_keys_version",
|
|
)
|
|
|
|
@trace
|
|
async def delete_e2e_room_keys_version(
|
|
self, user_id: str, version: Optional[str] = None
|
|
) -> None:
|
|
"""Delete a given backup version of the user's room keys.
|
|
Doesn't delete their actual key data.
|
|
|
|
Args:
|
|
user_id: the user whose backup version we're deleting
|
|
version: Optional. the version ID of the backup version we're deleting
|
|
If missing, we delete the current backup version info.
|
|
Raises:
|
|
StoreError: with code 404 if there are no e2e_room_keys_versions present,
|
|
or if the version requested doesn't exist.
|
|
"""
|
|
|
|
def _delete_e2e_room_keys_version_txn(txn: LoggingTransaction) -> None:
|
|
if version is None:
|
|
this_version = self._get_current_version(txn, user_id)
|
|
else:
|
|
try:
|
|
this_version = int(version)
|
|
except ValueError:
|
|
# Our versions are all ints so if we can't convert it to an integer,
|
|
# it isn't there.
|
|
raise StoreError(404, "No backup with that version exists")
|
|
|
|
self.db_pool.simple_delete_txn(
|
|
txn,
|
|
table="e2e_room_keys",
|
|
keyvalues={"user_id": user_id, "version": this_version},
|
|
)
|
|
|
|
self.db_pool.simple_update_one_txn(
|
|
txn,
|
|
table="e2e_room_keys_versions",
|
|
keyvalues={"user_id": user_id, "version": this_version},
|
|
updatevalues={"deleted": 1},
|
|
)
|
|
|
|
await self.db_pool.runInteraction(
|
|
"delete_e2e_room_keys_version", _delete_e2e_room_keys_version_txn
|
|
)
|