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108 lines
3.9 KiB
Python
108 lines
3.9 KiB
Python
# Copyright 2014-2016 OpenMarket 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 logging
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import re
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from typing import TYPE_CHECKING, Optional, Tuple
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from signedjson.sign import sign_json
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from unpaddedbase64 import encode_base64
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from twisted.web.server import Request
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from synapse.http.servlet import RestServlet
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from synapse.types import JsonDict
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class LocalKey(RestServlet):
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"""HTTP resource containing encoding the TLS X.509 certificate and NACL
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signature verification keys for this server::
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GET /_matrix/key/v2/server/a.key.id HTTP/1.1
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HTTP/1.1 200 OK
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Content-Type: application/json
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{
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"valid_until_ts": # integer posix timestamp when this result expires.
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"server_name": "this.server.example.com"
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"verify_keys": {
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"algorithm:version": {
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"key": # base64 encoded NACL verification key.
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}
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},
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"old_verify_keys": {
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"algorithm:version": {
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"expired_ts": # integer posix timestamp when the key expired.
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"key": # base64 encoded NACL verification key.
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}
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},
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"signatures": {
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"this.server.example.com": {
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"algorithm:version": # NACL signature for this server
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}
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}
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}
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"""
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PATTERNS = (re.compile("^/_matrix/key/v2/server(/(?P<key_id>[^/]*))?$"),)
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def __init__(self, hs: "HomeServer"):
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self.config = hs.config
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self.clock = hs.get_clock()
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self.update_response_body(self.clock.time_msec())
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def update_response_body(self, time_now_msec: int) -> None:
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refresh_interval = self.config.key.key_refresh_interval
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self.valid_until_ts = int(time_now_msec + refresh_interval)
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self.response_body = self.response_json_object()
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def response_json_object(self) -> JsonDict:
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verify_keys = {}
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for signing_key in self.config.key.signing_key:
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verify_key_bytes = signing_key.verify_key.encode()
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key_id = "%s:%s" % (signing_key.alg, signing_key.version)
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verify_keys[key_id] = {"key": encode_base64(verify_key_bytes)}
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old_verify_keys = {}
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for key_id, old_signing_key in self.config.key.old_signing_keys.items():
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verify_key_bytes = old_signing_key.encode()
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old_verify_keys[key_id] = {
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"key": encode_base64(verify_key_bytes),
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"expired_ts": old_signing_key.expired,
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}
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json_object = {
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"valid_until_ts": self.valid_until_ts,
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"server_name": self.config.server.server_name,
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"verify_keys": verify_keys,
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"old_verify_keys": old_verify_keys,
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}
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for key in self.config.key.signing_key:
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json_object = sign_json(json_object, self.config.server.server_name, key)
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return json_object
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def on_GET(
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self, request: Request, key_id: Optional[str] = None
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) -> Tuple[int, JsonDict]:
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time_now = self.clock.time_msec()
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# Update the expiry time if less than half the interval remains.
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if time_now + self.config.key.key_refresh_interval / 2 > self.valid_until_ts:
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self.update_response_body(time_now)
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return 200, self.response_body
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