1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2019 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.
import itertools
import logging
from typing import Dict, Iterable, List, Optional, Tuple
from signedjson.key import decode_verify_key_bytes
from synapse.storage._base import SQLBaseStore
from synapse.storage.keys import FetchKeyResult
from synapse.storage.types import Cursor
from synapse.util.caches.descriptors import cached, cachedList
from synapse.util.iterutils import batch_iter
logger = logging.getLogger(__name__)
db_binary_type = memoryview
class KeyStore(SQLBaseStore):
"""Persistence for signature verification keys"""
@cached()
def _get_server_verify_key(self, server_name_and_key_id):
raise NotImplementedError()
@cachedList(
cached_method_name="_get_server_verify_key", list_name="server_name_and_key_ids"
)
async def get_server_verify_keys(
self, server_name_and_key_ids: Iterable[Tuple[str, str]]
) -> Dict[Tuple[str, str], FetchKeyResult]:
"""
Args:
server_name_and_key_ids:
iterable of (server_name, key-id) tuples to fetch keys for
Returns:
A map from (server_name, key_id) -> FetchKeyResult, or None if the
key is unknown
"""
keys = {}
def _get_keys(txn: Cursor, batch: Tuple[Tuple[str, str]]) -> None:
"""Processes a batch of keys to fetch, and adds the result to `keys`."""
# batch_iter always returns tuples so it's safe to do len(batch)
sql = (
"SELECT server_name, key_id, verify_key, ts_valid_until_ms "
"FROM server_signature_keys WHERE 1=0"
) + " OR (server_name=? AND key_id=?)" * len(batch)
txn.execute(sql, tuple(itertools.chain.from_iterable(batch)))
for row in txn:
server_name, key_id, key_bytes, ts_valid_until_ms = row
if ts_valid_until_ms is None:
# Old keys may be stored with a ts_valid_until_ms of null,
# in which case we treat this as if it was set to `0`, i.e.
# it won't match key requests that define a minimum
# `ts_valid_until_ms`.
ts_valid_until_ms = 0
keys[(server_name, key_id)] = FetchKeyResult(
verify_key=decode_verify_key_bytes(key_id, bytes(key_bytes)),
valid_until_ts=ts_valid_until_ms,
)
def _txn(txn: Cursor) -> Dict[Tuple[str, str], FetchKeyResult]:
for batch in batch_iter(server_name_and_key_ids, 50):
_get_keys(txn, batch)
return keys
return await self.db_pool.runInteraction("get_server_verify_keys", _txn)
async def store_server_verify_keys(
self,
from_server: str,
ts_added_ms: int,
verify_keys: Iterable[Tuple[str, str, FetchKeyResult]],
) -> None:
"""Stores NACL verification keys for remote servers.
Args:
from_server: Where the verification keys were looked up
ts_added_ms: The time to record that the key was added
verify_keys:
keys to be stored. Each entry is a triplet of
(server_name, key_id, key).
"""
key_values = []
value_values = []
invalidations = []
for server_name, key_id, fetch_result in verify_keys:
key_values.append((server_name, key_id))
value_values.append(
(
from_server,
ts_added_ms,
fetch_result.valid_until_ts,
db_binary_type(fetch_result.verify_key.encode()),
)
)
# invalidate takes a tuple corresponding to the params of
# _get_server_verify_key. _get_server_verify_key only takes one
# param, which is itself the 2-tuple (server_name, key_id).
invalidations.append((server_name, key_id))
await self.db_pool.simple_upsert_many(
table="server_signature_keys",
key_names=("server_name", "key_id"),
key_values=key_values,
value_names=(
"from_server",
"ts_added_ms",
"ts_valid_until_ms",
"verify_key",
),
value_values=value_values,
desc="store_server_verify_keys",
)
invalidate = self._get_server_verify_key.invalidate
for i in invalidations:
invalidate((i,))
async def store_server_keys_json(
self,
server_name: str,
key_id: str,
from_server: str,
ts_now_ms: int,
ts_expires_ms: int,
key_json_bytes: bytes,
) -> None:
"""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: The name of the server.
key_id: The identifier of the key this JSON is for.
from_server: The server this JSON was fetched from.
ts_now_ms: The time now in milliseconds.
ts_valid_until_ms: The time when this json stops being valid.
key_json_bytes: The encoded JSON.
"""
await self.db_pool.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",
)
async def get_server_keys_json(
self, server_keys: Iterable[Tuple[str, Optional[str], Optional[str]]]
) -> Dict[Tuple[str, Optional[str], Optional[str]], List[dict]]:
"""Retrieve 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:
A mapping from (server_name, key_id, source) triplets to a list 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.db_pool.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 await self.db_pool.runInteraction(
"get_server_keys_json", _get_server_keys_json_txn
)
|
