126 lines
4.3 KiB
Python
126 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 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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from twisted.web.resource import Resource
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from synapse.http.server import respond_with_json_bytes
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from signedjson.sign import sign_json
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from unpaddedbase64 import encode_base64
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from canonicaljson import encode_canonical_json
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from hashlib import sha256
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from OpenSSL import crypto
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import logging
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logger = logging.getLogger(__name__)
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class LocalKey(Resource):
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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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"tls_certificate": # base64 ASN.1 DER encoded X.509 tls cert.
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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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isLeaf = True
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def __init__(self, hs):
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self.version_string = hs.version_string
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self.config = hs.config
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self.clock = hs.clock
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self.update_response_body(self.clock.time_msec())
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Resource.__init__(self)
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def update_response_body(self, time_now_msec):
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refresh_interval = self.config.key_refresh_interval
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self.valid_until_ts = int(time_now_msec + refresh_interval)
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self.response_body = encode_canonical_json(self.response_json_object())
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def response_json_object(self):
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verify_keys = {}
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for key in self.config.signing_key:
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verify_key_bytes = key.verify_key.encode()
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key_id = "%s:%s" % (key.alg, key.version)
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verify_keys[key_id] = {
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u"key": encode_base64(verify_key_bytes)
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}
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old_verify_keys = {}
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for key in self.config.old_signing_keys:
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key_id = "%s:%s" % (key.alg, key.version)
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verify_key_bytes = key.encode()
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old_verify_keys[key_id] = {
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u"key": encode_base64(verify_key_bytes),
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u"expired_ts": key.expired,
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}
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x509_certificate_bytes = crypto.dump_certificate(
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crypto.FILETYPE_ASN1,
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self.config.tls_certificate
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)
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sha256_fingerprint = sha256(x509_certificate_bytes).digest()
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json_object = {
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u"valid_until_ts": self.valid_until_ts,
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u"server_name": self.config.server_name,
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u"verify_keys": verify_keys,
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u"old_verify_keys": old_verify_keys,
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u"tls_fingerprints": [{
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u"sha256": encode_base64(sha256_fingerprint),
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}]
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}
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for key in self.config.signing_key:
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json_object = sign_json(
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json_object,
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self.config.server_name,
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key,
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)
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return json_object
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def render_GET(self, request):
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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_refresh_interval / 2 > self.valid_until_ts:
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self.update_response_body(time_now)
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return respond_with_json_bytes(
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request, 200, self.response_body,
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version_string=self.version_string
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)
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