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- # -*- coding: utf-8 -*-
- # Copyright 2014, 2015 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.
- from twisted.web.resource import Resource
- from synapse.http.server import respond_with_json_bytes
- from syutil.crypto.jsonsign import sign_json
- from syutil.base64util import encode_base64
- from syutil.jsonutil import encode_canonical_json
- from OpenSSL import crypto
- import logging
- logger = logging.getLogger(__name__)
- class LocalKey(Resource):
- """HTTP resource containing encoding the TLS X.509 certificate and NACL
- signature verification keys for this server::
- GET /_matrix/key/v2/ HTTP/1.1
- HTTP/1.1 200 OK
- Content-Type: application/json
- {
- "expires": # integer posix timestamp when this result expires.
- "server_name": "this.server.example.com"
- "verify_keys": {
- "algorithm:version": # base64 encoded NACL verification key.
- },
- "old_verify_keys": {
- "algorithm:version": {
- "expired": # integer posix timestamp when the key expired.
- "key": # base64 encoded NACL verification key.
- }
- }
- "tls_certificate": # base64 ASN.1 DER encoded X.509 tls cert.
- "signatures": {
- "this.server.example.com": {
- "algorithm:version": # NACL signature for this server
- }
- }
- }
- """
- def __init__(self, hs):
- self.version_string = hs.version_string
- self.config = hs.config
- self.clock = hs.clock
- self.update_response_body(self.clock.time_msec())
- Resource.__init__(self)
- def update_response_body(self, time_now_msec):
- refresh_interval = self.config.key_refresh_interval
- self.expires = int(time_now_msec + refresh_interval)
- self.response_body = encode_canonical_json(self.response_json_object())
- def response_json_object(self):
- verify_keys = {}
- for key in self.config.signing_key:
- verify_key_bytes = key.verify_key.encode()
- key_id = "%s:%s" % (key.alg, key.version)
- verify_keys[key_id] = encode_base64(verify_key_bytes)
- old_verify_keys = {}
- for key in self.config.old_signing_keys:
- key_id = "%s:%s" % (key.alg, key.version)
- verify_key_bytes = key.encode()
- old_verify_keys[key_id] = {
- u"key": encode_base64(verify_key_bytes),
- u"expired": key.expired,
- }
- x509_certificate_bytes = crypto.dump_certificate(
- crypto.FILETYPE_ASN1,
- self.config.tls_certificate
- )
- json_object = {
- u"expires": self.expires,
- u"server_name": self.config.server_name,
- u"verify_keys": verify_keys,
- u"old_verify_keys": old_verify_keys,
- u"tls_certificate": encode_base64(x509_certificate_bytes)
- }
- for key in self.config.signing_key:
- json_object = sign_json(
- json_object,
- self.config.server_name,
- key,
- )
- return json_object
- def render_GET(self, request):
- time_now = self.clock.time_msec()
- # Update the expiry time if less than half the interval remains.
- if time_now + self.config.key_refresh_interval / 2 > self.expires:
- self.update_response_body()
- return respond_with_json_bytes(
- request, 200, self.response_body,
- version_string=self.version_string
- )
- def getChild(self, name, request):
- if name == '':
- return self
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