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# -*- coding: utf-8 -*-
# Copyright 2017 New Vector Ltd
#
# 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.
from twisted.internet import defer
from ._base import SQLBaseStore
class EndToEndRoomKeyStore(SQLBaseStore):
@defer.inlineCallbacks
def get_e2e_room_key(self, user_id, version, room_id, session_id):
"""Get the encrypted E2E room key for a given session from a given
backup version of room_keys. We only store the 'best' room key for a given
session at a given time, as determined by the handler.
Args:
user_id(str): the user whose backup we're querying
version(str): the version ID of the backup for the set of keys we're querying
room_id(str): the ID of the room whose keys we're querying.
This is a bit redundant as it's implied by the session_id, but
we include for consistency with the rest of the API.
session_id(str): the session whose room_key we're querying.
Returns:
A deferred dict giving the session_data and message metadata for
this room key.
"""
row = yield self._simple_select_one(
table="e2e_room_keys",
keyvalues={
"user_id": user_id,
"version": version,
"room_id": room_id,
"session_id": session_id,
},
retcols=(
"first_message_index",
"forwarded_count",
"is_verified",
"session_data",
),
desc="get_e2e_room_key",
)
defer.returnValue(row)
@defer.inlineCallbacks
def set_e2e_room_key(self, user_id, version, room_id, session_id, room_key):
"""Replaces or inserts the encrypted E2E room key for a given session in
a given backup
Args:
user_id(str): the user whose backup we're setting
version(str): the version ID of the backup we're updating
room_id(str): the ID of the room whose keys we're setting
session_id(str): the session whose room_key we're setting
room_key(dict): the room_key being set
Raises:
StoreError if stuff goes wrong, probably
"""
yield self._simple_upsert(
table="e2e_room_keys",
keyvalues={
"user_id": user_id,
"room_id": room_id,
"session_id": session_id,
},
values={
"version": version,
"first_message_index": room_key['first_message_index'],
"forwarded_count": room_key['forwarded_count'],
"is_verified": room_key['is_verified'],
"session_data": room_key['session_data'],
},
lock=False,
)
@defer.inlineCallbacks
def get_e2e_room_keys(
self, user_id, version, room_id=None, session_id=None
):
"""Bulk get the E2E room keys for a given backup, optionally filtered to a given
room, or a given session.
Args:
user_id(str): the user whose backup we're querying
version(str): the version ID of the backup for the set of keys we're querying
room_id(str): 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(str): 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 deferred list of dicts giving the session_data and message metadata for
these room keys.
"""
keyvalues = {
"user_id": user_id,
"version": version,
}
if room_id:
keyvalues['room_id'] = room_id
if session_id:
keyvalues['session_id'] = session_id
rows = yield self._simple_select_list(
table="e2e_room_keys",
keyvalues=keyvalues,
retcols=(
"user_id",
"room_id",
"session_id",
"first_message_index",
"forwarded_count",
"is_verified",
"session_data",
),
desc="get_e2e_room_keys",
)
sessions = {'rooms': {}}
for row in rows:
room_entry = sessions['rooms'].setdefault(row['room_id'], {"sessions": {}})
room_entry['sessions'][row['session_id']] = {
"first_message_index": row["first_message_index"],
"forwarded_count": row["forwarded_count"],
"is_verified": row["is_verified"],
"session_data": row["session_data"],
}
defer.returnValue(sessions)
@defer.inlineCallbacks
def delete_e2e_room_keys(
self, user_id, version, room_id=None, session_id=None
):
"""Bulk delete the E2E room keys for a given backup, optionally filtered to a given
room or a given session.
Args:
user_id(str): the user whose backup we're deleting from
version(str): the version ID of the backup for the set of keys we're deleting
room_id(str): 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(str): 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)
Returns:
A deferred of the deletion transaction
"""
keyvalues = {
"user_id": user_id,
"version": version,
}
if room_id:
keyvalues['room_id'] = room_id
if session_id:
keyvalues['session_id'] = session_id
yield self._simple_delete(
table="e2e_room_keys",
keyvalues=keyvalues,
desc="delete_e2e_room_keys",
)
def get_e2e_room_keys_version_info(self, user_id, version=None):
"""Get info metadata about a version of our room_keys backup.
Args:
user_id(str): the user whose backup we're querying
version(str): 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 deferred dict giving the info metadata for this backup version
"""
def _get_e2e_room_keys_version_info_txn(txn):
if version is None:
txn.execute(
"SELECT MAX(version) FROM e2e_room_keys_versions WHERE user_id=?",
(user_id,)
)
this_version = txn.fetchone()[0]
else:
this_version = version
return self._simple_select_one_txn(
txn,
table="e2e_room_keys_versions",
keyvalues={
"user_id": user_id,
"version": this_version,
},
retcols=(
"version",
"algorithm",
"auth_data",
),
)
return self.runInteraction(
"get_e2e_room_keys_version_info",
_get_e2e_room_keys_version_info_txn
)
def create_e2e_room_keys_version(self, user_id, info):
"""Atomically creates a new version of this user's e2e_room_keys store
with the given version info.
Args:
user_id(str): the user whose backup we're creating a version
info(dict): the info about the backup version to be created
Returns:
A deferred string for the newly created version ID
"""
def _create_e2e_room_keys_version_txn(txn):
txn.execute(
"SELECT MAX(version) FROM e2e_room_keys_versions WHERE user_id=?",
(user_id,)
)
current_version = txn.fetchone()[0]
if current_version is None:
current_version = '0'
new_version = str(int(current_version) + 1)
self._simple_insert_txn(
txn,
table="e2e_room_keys_versions",
values={
"user_id": user_id,
"version": new_version,
"algorithm": info["algorithm"],
"auth_data": info["auth_data"],
},
)
return new_version
return self.runInteraction(
"create_e2e_room_keys_version_txn", _create_e2e_room_keys_version_txn
)
@defer.inlineCallbacks
def delete_e2e_room_keys_version(self, user_id, version):
"""Delete a given backup version of the user's room keys.
Doesn't delete their actual key data.
Args:
user_id(str): the user whose backup version we're deleting
version(str): the ID of the backup version we're deleting
"""
keyvalues = {
"user_id": user_id,
"version": version,
}
yield self._simple_delete(
table="e2e_room_keys_versions",
keyvalues=keyvalues,
desc="delete_e2e_room_keys_version",
)
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