215 lines
8.2 KiB
Python
215 lines
8.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2019 New Vector Ltd.
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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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import itertools
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import logging
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import six
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from signedjson.key import decode_verify_key_bytes
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.keys import FetchKeyResult
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from synapse.util.caches.descriptors import cached, cachedList
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from synapse.util.iterutils import batch_iter
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logger = logging.getLogger(__name__)
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# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
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# despite being deprecated and removed in favor of memoryview
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if six.PY2:
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db_binary_type = six.moves.builtins.buffer
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else:
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db_binary_type = memoryview
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class KeyStore(SQLBaseStore):
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"""Persistence for signature verification keys
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"""
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@cached()
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def _get_server_verify_key(self, server_name_and_key_id):
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raise NotImplementedError()
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@cachedList(
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cached_method_name="_get_server_verify_key", list_name="server_name_and_key_ids"
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)
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def get_server_verify_keys(self, server_name_and_key_ids):
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"""
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Args:
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server_name_and_key_ids (iterable[Tuple[str, str]]):
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iterable of (server_name, key-id) tuples to fetch keys for
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Returns:
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Deferred: resolves to dict[Tuple[str, str], FetchKeyResult|None]:
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map from (server_name, key_id) -> FetchKeyResult, or None if the key is
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unknown
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"""
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keys = {}
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def _get_keys(txn, batch):
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"""Processes a batch of keys to fetch, and adds the result to `keys`."""
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# batch_iter always returns tuples so it's safe to do len(batch)
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sql = (
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"SELECT server_name, key_id, verify_key, ts_valid_until_ms "
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"FROM server_signature_keys WHERE 1=0"
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) + " OR (server_name=? AND key_id=?)" * len(batch)
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txn.execute(sql, tuple(itertools.chain.from_iterable(batch)))
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for row in txn:
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server_name, key_id, key_bytes, ts_valid_until_ms = row
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if ts_valid_until_ms is None:
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# Old keys may be stored with a ts_valid_until_ms of null,
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# in which case we treat this as if it was set to `0`, i.e.
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# it won't match key requests that define a minimum
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# `ts_valid_until_ms`.
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ts_valid_until_ms = 0
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res = FetchKeyResult(
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verify_key=decode_verify_key_bytes(key_id, bytes(key_bytes)),
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valid_until_ts=ts_valid_until_ms,
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)
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keys[(server_name, key_id)] = res
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def _txn(txn):
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for batch in batch_iter(server_name_and_key_ids, 50):
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_get_keys(txn, batch)
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return keys
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return self.db.runInteraction("get_server_verify_keys", _txn)
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def store_server_verify_keys(self, from_server, ts_added_ms, verify_keys):
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"""Stores NACL verification keys for remote servers.
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Args:
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from_server (str): Where the verification keys were looked up
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ts_added_ms (int): The time to record that the key was added
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verify_keys (iterable[tuple[str, str, FetchKeyResult]]):
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keys to be stored. Each entry is a triplet of
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(server_name, key_id, key).
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"""
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key_values = []
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value_values = []
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invalidations = []
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for server_name, key_id, fetch_result in verify_keys:
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key_values.append((server_name, key_id))
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value_values.append(
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(
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from_server,
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ts_added_ms,
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fetch_result.valid_until_ts,
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db_binary_type(fetch_result.verify_key.encode()),
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)
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)
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# invalidate takes a tuple corresponding to the params of
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# _get_server_verify_key. _get_server_verify_key only takes one
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# param, which is itself the 2-tuple (server_name, key_id).
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invalidations.append((server_name, key_id))
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def _invalidate(res):
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f = self._get_server_verify_key.invalidate
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for i in invalidations:
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f((i,))
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return res
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return self.db.runInteraction(
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"store_server_verify_keys",
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self.db.simple_upsert_many_txn,
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table="server_signature_keys",
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key_names=("server_name", "key_id"),
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key_values=key_values,
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value_names=(
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"from_server",
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"ts_added_ms",
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"ts_valid_until_ms",
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"verify_key",
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),
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value_values=value_values,
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).addCallback(_invalidate)
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def store_server_keys_json(
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self, server_name, key_id, from_server, ts_now_ms, ts_expires_ms, key_json_bytes
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):
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"""Stores the JSON bytes for a set of keys from a server
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The JSON should be signed by the originating server, the intermediate
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server, and by this server. Updates the value for the
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(server_name, key_id, from_server) triplet if one already existed.
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Args:
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server_name (str): The name of the server.
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key_id (str): The identifer of the key this JSON is for.
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from_server (str): The server this JSON was fetched from.
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ts_now_ms (int): The time now in milliseconds.
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ts_valid_until_ms (int): The time when this json stops being valid.
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key_json (bytes): The encoded JSON.
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"""
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return self.db.simple_upsert(
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table="server_keys_json",
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keyvalues={
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"server_name": server_name,
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"key_id": key_id,
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"from_server": from_server,
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},
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values={
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"server_name": server_name,
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"key_id": key_id,
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"from_server": from_server,
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"ts_added_ms": ts_now_ms,
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"ts_valid_until_ms": ts_expires_ms,
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"key_json": db_binary_type(key_json_bytes),
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},
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desc="store_server_keys_json",
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)
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def get_server_keys_json(self, server_keys):
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"""Retrive the key json for a list of server_keys and key ids.
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If no keys are found for a given server, key_id and source then
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that server, key_id, and source triplet entry will be an empty list.
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The JSON is returned as a byte array so that it can be efficiently
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used in an HTTP response.
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Args:
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server_keys (list): List of (server_name, key_id, source) triplets.
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Returns:
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Deferred[dict[Tuple[str, str, str|None], list[dict]]]:
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Dict mapping (server_name, key_id, source) triplets to lists of dicts
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"""
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def _get_server_keys_json_txn(txn):
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results = {}
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for server_name, key_id, from_server in server_keys:
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keyvalues = {"server_name": server_name}
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if key_id is not None:
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keyvalues["key_id"] = key_id
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if from_server is not None:
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keyvalues["from_server"] = from_server
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rows = self.db.simple_select_list_txn(
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txn,
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"server_keys_json",
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keyvalues=keyvalues,
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retcols=(
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"key_id",
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"from_server",
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"ts_added_ms",
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"ts_valid_until_ms",
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"key_json",
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),
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)
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results[(server_name, key_id, from_server)] = rows
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return results
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return self.db.runInteraction("get_server_keys_json", _get_server_keys_json_txn)
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