anonymousland-synapse/synapse/storage/databases/main/e2e_room_keys.py

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# Copyright 2017 New Vector Ltd
# Copyright 2019 Matrix.org Foundation C.I.C.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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from typing import Dict, Iterable, Mapping, Optional, Tuple, cast
from typing_extensions import Literal, TypedDict
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from synapse.api.errors import StoreError
from synapse.logging.opentracing import log_kv, trace
from synapse.storage._base import SQLBaseStore, db_to_json
from synapse.storage.database import LoggingTransaction
from synapse.types import JsonDict, JsonSerializable, StreamKeyType
from synapse.util import json_encoder
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class RoomKey(TypedDict):
"""`KeyBackupData` in the Matrix spec.
https://spec.matrix.org/v1.1/client-server-api/#get_matrixclientv3room_keyskeysroomidsessionid
"""
first_message_index: int
forwarded_count: int
is_verified: bool
session_data: JsonSerializable
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class EndToEndRoomKeyStore(SQLBaseStore):
"""The store for end to end room key backups.
See https://spec.matrix.org/v1.1/client-server-api/#server-side-key-backups
As per the spec, backups are identified by an opaque version string. Internally,
version identifiers are assigned using incrementing integers. Non-numeric version
strings are treated as if they do not exist, since we would have never issued them.
"""
async def update_e2e_room_key(
self,
user_id: str,
version: str,
room_id: str,
session_id: str,
room_key: RoomKey,
) -> None:
"""Replaces the encrypted E2E room key for a given session in a given backup
Args:
user_id: the user whose backup we're setting
version: the version ID of the backup we're updating
room_id: the ID of the room whose keys we're setting
session_id: the session whose room_key we're setting
room_key: the room_key being set
Raises:
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StoreError
"""
try:
version_int = int(version)
except ValueError:
# Our versions are all ints so if we can't convert it to an integer,
# it doesn't exist.
raise StoreError(404, "No backup with that version exists")
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await self.db_pool.simple_update_one(
table="e2e_room_keys",
keyvalues={
"user_id": user_id,
"version": version_int,
"room_id": room_id,
"session_id": session_id,
},
updatevalues={
"first_message_index": room_key["first_message_index"],
"forwarded_count": room_key["forwarded_count"],
"is_verified": room_key["is_verified"],
"session_data": json_encoder.encode(room_key["session_data"]),
},
desc="update_e2e_room_key",
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)
async def add_e2e_room_keys(
self, user_id: str, version: str, room_keys: Iterable[Tuple[str, str, RoomKey]]
) -> None:
"""Bulk add room keys to a given backup.
Args:
user_id: the user whose backup we're adding to
version: the version ID of the backup for the set of keys we're adding to
room_keys: the keys to add, in the form (roomID, sessionID, keyData)
"""
try:
version_int = int(version)
except ValueError:
# Our versions are all ints so if we can't convert it to an integer,
# it doesn't exist.
raise StoreError(404, "No backup with that version exists")
values = []
for (room_id, session_id, room_key) in room_keys:
values.append(
(
user_id,
version_int,
room_id,
session_id,
room_key["first_message_index"],
room_key["forwarded_count"],
room_key["is_verified"],
json_encoder.encode(room_key["session_data"]),
)
)
log_kv(
{
"message": "Set room key",
"room_id": room_id,
"session_id": session_id,
StreamKeyType.ROOM: room_key,
}
)
await self.db_pool.simple_insert_many(
table="e2e_room_keys",
keys=(
"user_id",
"version",
"room_id",
"session_id",
"first_message_index",
"forwarded_count",
"is_verified",
"session_data",
),
values=values,
desc="add_e2e_room_keys",
)
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@trace
async def get_e2e_room_keys(
self,
user_id: str,
version: str,
room_id: Optional[str] = None,
session_id: Optional[str] = None,
) -> Dict[
Literal["rooms"], Dict[str, Dict[Literal["sessions"], Dict[str, RoomKey]]]
]:
"""Bulk get the E2E room keys for a given backup, optionally filtered to a given
room, or a given session.
Args:
user_id: the user whose backup we're querying
version: the version ID of the backup for the set of keys we're querying
room_id: Optional. the ID of the room whose keys we're querying, if any.
If not specified, we return the keys for all the rooms in the backup.
session_id: Optional. the session whose room_key we're querying, if any.
If specified, we also require the room_id to be specified.
If not specified, we return all the keys in this version of
the backup (or for the specified room)
Returns:
A dict giving the session_data and message metadata for these room keys.
`{"rooms": {room_id: {"sessions": {session_id: room_key}}}}`
"""
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try:
version_int = int(version)
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except ValueError:
return {"rooms": {}}
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keyvalues = {"user_id": user_id, "version": version_int}
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if room_id:
keyvalues["room_id"] = room_id
if session_id:
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",
keyvalues=keyvalues,
retcols=(
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"user_id",
"room_id",
"session_id",
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"first_message_index",
"forwarded_count",
"is_verified",
"session_data",
),
desc="get_e2e_room_keys",
)
sessions: Dict[
Literal["rooms"], Dict[str, Dict[Literal["sessions"], Dict[str, RoomKey]]]
] = {"rooms": {}}
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for row in rows:
room_entry = sessions["rooms"].setdefault(row["room_id"], {"sessions": {}})
room_entry["sessions"][row["session_id"]] = {
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"first_message_index": row["first_message_index"],
"forwarded_count": row["forwarded_count"],
# is_verified must be returned to the client as a boolean
"is_verified": bool(row["is_verified"]),
"session_data": db_to_json(row["session_data"]),
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}
return sessions
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async def get_e2e_room_keys_multi(
self,
user_id: str,
version: str,
room_keys: Mapping[str, Mapping[Literal["sessions"], Iterable[str]]],
) -> Dict[str, Dict[str, RoomKey]]:
"""Get multiple room keys at a time. The difference between this function and
get_e2e_room_keys is that this function can be used to retrieve
multiple specific keys at a time, whereas get_e2e_room_keys is used for
getting all the keys in a backup version, all the keys for a room, or a
specific key.
Args:
user_id: the user whose backup we're querying
version: the version ID of the backup we're querying about
room_keys: a map from room ID -> {"sessions": [session ids]}
indicating the session IDs that we want to query
Returns:
A map of room IDs to session IDs to room key
"""
try:
version_int = int(version)
except ValueError:
# Our versions are all ints so if we can't convert it to an integer,
# it doesn't exist.
return {}
return await self.db_pool.runInteraction(
"get_e2e_room_keys_multi",
self._get_e2e_room_keys_multi_txn,
user_id,
version_int,
room_keys,
)
@staticmethod
def _get_e2e_room_keys_multi_txn(
txn: LoggingTransaction,
user_id: str,
version: int,
room_keys: Mapping[str, Mapping[Literal["sessions"], Iterable[str]]],
) -> Dict[str, Dict[str, RoomKey]]:
if not room_keys:
return {}
where_clauses = []
params = [user_id, version]
for room_id, room in room_keys.items():
sessions = list(room["sessions"])
if not sessions:
continue
params.append(room_id)
params.extend(sessions)
where_clauses.append(
"(room_id = ? AND session_id IN (%s))"
% (",".join(["?" for _ in sessions]),)
)
# check if we're actually querying something
if not where_clauses:
return {}
sql = """
SELECT room_id, session_id, first_message_index, forwarded_count,
is_verified, session_data
FROM e2e_room_keys
WHERE user_id = ? AND version = ? AND (%s)
""" % (
" OR ".join(where_clauses)
)
txn.execute(sql, params)
ret: Dict[str, Dict[str, RoomKey]] = {}
for row in txn:
room_id = row[0]
session_id = row[1]
ret.setdefault(room_id, {})
ret[room_id][session_id] = {
"first_message_index": row[2],
"forwarded_count": row[3],
"is_verified": row[4],
"session_data": db_to_json(row[5]),
}
return ret
async def count_e2e_room_keys(self, user_id: str, version: str) -> int:
"""Get the number of keys in a backup version.
Args:
user_id: the user whose backup we're querying
version: the version ID of the backup we're querying about
"""
try:
version_int = int(version)
except ValueError:
# Our versions are all ints so if we can't convert it to an integer,
# it doesn't exist.
return 0
return await self.db_pool.simple_select_one_onecol(
table="e2e_room_keys",
keyvalues={"user_id": user_id, "version": version_int},
retcol="COUNT(*)",
desc="count_e2e_room_keys",
)
@trace
async def delete_e2e_room_keys(
self,
user_id: str,
version: str,
room_id: Optional[str] = None,
session_id: Optional[str] = None,
) -> None:
"""Bulk delete the E2E room keys for a given backup, optionally filtered to a given
room or a given session.
Args:
user_id: the user whose backup we're deleting from
version: the version ID of the backup for the set of keys we're deleting
room_id: Optional. the ID of the room whose keys we're deleting, if any.
If not specified, we delete the keys for all the rooms in the backup.
session_id: Optional. the session whose room_key we're querying, if any.
If specified, we also require the room_id to be specified.
If not specified, we delete all the keys in this version of
the backup (or for the specified room)
"""
try:
version_int = int(version)
except ValueError:
# Our versions are all ints so if we can't convert it to an integer,
# it doesn't exist.
return
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keyvalues = {"user_id": user_id, "version": version_int}
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if room_id:
keyvalues["room_id"] = room_id
if session_id:
keyvalues["session_id"] = session_id
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await self.db_pool.simple_delete(
table="e2e_room_keys", keyvalues=keyvalues, desc="delete_e2e_room_keys"
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)
@staticmethod
def _get_current_version(txn: LoggingTransaction, user_id: str) -> int:
txn.execute(
"SELECT MAX(version) FROM e2e_room_keys_versions "
"WHERE user_id=? AND deleted=0",
(user_id,),
)
# `SELECT MAX() FROM ...` will always return 1 row. The value in that row will
# be `NULL` when there are no available versions.
row = cast(Tuple[Optional[int]], txn.fetchone())
if row[0] is None:
raise StoreError(404, "No current backup version")
return row[0]
async def get_e2e_room_keys_version_info(
self, user_id: str, version: Optional[str] = None
) -> JsonDict:
"""Get info metadata about a version of our room_keys backup.
Args:
user_id: the user whose backup we're querying
version: Optional. the version ID of the backup we're querying about
If missing, we return the information about the current version.
Raises:
StoreError: with code 404 if there are no e2e_room_keys_versions present
Returns:
A dict giving the info metadata for this backup version, with
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fields including:
version (str)
algorithm (str)
auth_data (object): opaque dict supplied by the client
etag (int): tag of the keys in the backup
"""
def _get_e2e_room_keys_version_info_txn(txn: LoggingTransaction) -> JsonDict:
if version is None:
this_version = self._get_current_version(txn, user_id)
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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")
result = self.db_pool.simple_select_one_txn(
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txn,
table="e2e_room_keys_versions",
keyvalues={"user_id": user_id, "version": this_version, "deleted": 0},
retcols=("version", "algorithm", "auth_data", "etag"),
allow_none=False,
)
assert result is not None # see comment on `simple_select_one_txn`
result["auth_data"] = db_to_json(result["auth_data"])
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result["version"] = str(result["version"])
if result["etag"] is None:
result["etag"] = 0
return result
return await self.db_pool.runInteraction(
"get_e2e_room_keys_version_info", _get_e2e_room_keys_version_info_txn
)
@trace
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
with the given version info.
Args:
user_id: the user whose backup we're creating a version
info: the info about the backup version to be created
Returns:
The newly created version ID
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"""
def _create_e2e_room_keys_version_txn(txn: LoggingTransaction) -> str:
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txn.execute(
"SELECT MAX(version) FROM e2e_room_keys_versions WHERE user_id=?",
(user_id,),
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)
current_version = cast(Tuple[Optional[int]], txn.fetchone())[0]
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if current_version is None:
current_version = 0
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new_version = current_version + 1
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self.db_pool.simple_insert_txn(
txn,
table="e2e_room_keys_versions",
values={
"user_id": user_id,
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"version": new_version,
"algorithm": info["algorithm"],
"auth_data": json_encoder.encode(info["auth_data"]),
},
)
return str(new_version)
return await self.db_pool.runInteraction(
"create_e2e_room_keys_version_txn", _create_e2e_room_keys_version_txn
)
@trace
async def update_e2e_room_keys_version(
self,
user_id: str,
version: str,
info: Optional[JsonDict] = None,
version_etag: Optional[int] = None,
) -> None:
"""Update a given backup version
Args:
user_id: the user whose backup version we're updating
version: the version ID of the backup version we're updating
info: the new backup version info to store. If None, then the backup
version info is not updated.
version_etag: etag of the keys in the backup. If None, then the etag
is not updated.
"""
updatevalues: Dict[str, object] = {}
if info is not None and "auth_data" in info:
updatevalues["auth_data"] = json_encoder.encode(info["auth_data"])
if version_etag is not None:
updatevalues["etag"] = version_etag
if updatevalues:
try:
version_int = int(version)
except ValueError:
# Our versions are all ints so if we can't convert it to an integer,
# it doesn't exist.
raise StoreError(404, "No backup with that version exists")
await self.db_pool.simple_update_one(
table="e2e_room_keys_versions",
keyvalues={"user_id": user_id, "version": version_int},
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(
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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
)