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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket 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.
import logging
import six
from signedjson.key import decode_verify_key_bytes
from twisted.internet import defer
from synapse.util.caches.descriptors import cachedInlineCallbacks
from ._base import SQLBaseStore
logger = logging.getLogger(__name__)
# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
# despite being deprecated and removed in favor of memoryview
if six.PY2:
db_binary_type = six.moves.builtins.buffer
else:
db_binary_type = memoryview
class KeyStore(SQLBaseStore):
"""Persistence for signature verification keys
"""
@cachedInlineCallbacks()
def _get_server_verify_key(self, server_name, key_id):
verify_key_bytes = yield self._simple_select_one_onecol(
table="server_signature_keys",
keyvalues={"server_name": server_name, "key_id": key_id},
retcol="verify_key",
desc="_get_server_verify_key",
allow_none=True,
)
if verify_key_bytes:
defer.returnValue(decode_verify_key_bytes(key_id, bytes(verify_key_bytes)))
@defer.inlineCallbacks
def get_server_verify_keys(self, server_name, key_ids):
"""Retrieve the NACL verification key for a given server for the given
key_ids
Args:
server_name (str): The name of the server.
key_ids (iterable[str]): key_ids to try and look up.
Returns:
Deferred: resolves to dict[str, VerifyKey]: map from
key_id to verification key.
"""
keys = {}
for key_id in key_ids:
key = yield self._get_server_verify_key(server_name, key_id)
if key:
keys[key_id] = key
defer.returnValue(keys)
def store_server_verify_key(
self, server_name, from_server, time_now_ms, verify_key
):
"""Stores a NACL verification key for the given server.
Args:
server_name (str): The name of the server.
from_server (str): Where the verification key was looked up
time_now_ms (int): The time now in milliseconds
verify_key (nacl.signing.VerifyKey): The NACL verify key.
"""
key_id = "%s:%s" % (verify_key.alg, verify_key.version)
# XXX fix this to not need a lock (#3819)
def _txn(txn):
self._simple_upsert_txn(
txn,
table="server_signature_keys",
keyvalues={"server_name": server_name, "key_id": key_id},
values={
"from_server": from_server,
"ts_added_ms": time_now_ms,
"verify_key": db_binary_type(verify_key.encode()),
},
)
txn.call_after(
self._get_server_verify_key.invalidate, (server_name, key_id)
)
return self.runInteraction("store_server_verify_key", _txn)
def store_server_keys_json(
self, server_name, key_id, from_server, ts_now_ms, ts_expires_ms, key_json_bytes
):
"""Stores the JSON bytes for a set of keys from a server
The JSON should be signed by the originating server, the intermediate
server, and by this server. Updates the value for the
(server_name, key_id, from_server) triplet if one already existed.
Args:
server_name (str): The name of the server.
key_id (str): The identifer of the key this JSON is for.
from_server (str): The server this JSON was fetched from.
ts_now_ms (int): The time now in milliseconds.
ts_valid_until_ms (int): The time when this json stops being valid.
key_json (bytes): The encoded JSON.
"""
return self._simple_upsert(
table="server_keys_json",
keyvalues={
"server_name": server_name,
"key_id": key_id,
"from_server": from_server,
},
values={
"server_name": server_name,
"key_id": key_id,
"from_server": from_server,
"ts_added_ms": ts_now_ms,
"ts_valid_until_ms": ts_expires_ms,
"key_json": db_binary_type(key_json_bytes),
},
desc="store_server_keys_json",
)
def get_server_keys_json(self, server_keys):
"""Retrive the key json for a list of server_keys and key ids.
If no keys are found for a given server, key_id and source then
that server, key_id, and source triplet entry will be an empty list.
The JSON is returned as a byte array so that it can be efficiently
used in an HTTP response.
Args:
server_keys (list): List of (server_name, key_id, source) triplets.
Returns:
Deferred[dict[Tuple[str, str, str|None], list[dict]]]:
Dict mapping (server_name, key_id, source) triplets to lists of dicts
"""
def _get_server_keys_json_txn(txn):
results = {}
for server_name, key_id, from_server in server_keys:
keyvalues = {"server_name": server_name}
if key_id is not None:
keyvalues["key_id"] = key_id
if from_server is not None:
keyvalues["from_server"] = from_server
rows = self._simple_select_list_txn(
txn,
"server_keys_json",
keyvalues=keyvalues,
retcols=(
"key_id",
"from_server",
"ts_added_ms",
"ts_valid_until_ms",
"key_json",
),
)
results[(server_name, key_id, from_server)] = rows
return results
return self.runInteraction("get_server_keys_json", _get_server_keys_json_txn)
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