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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 signedjson.sign import sign_json
from unpaddedbase64 import encode_base64
from canonicaljson import encode_canonical_json
from hashlib import sha256
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/server/a.key.id HTTP/1.1
HTTP/1.1 200 OK
Content-Type: application/json
{
"valid_until_ts": # integer posix timestamp when this result expires.
"server_name": "this.server.example.com"
"verify_keys": {
"algorithm:version": {
"key": # base64 encoded NACL verification key.
}
},
"old_verify_keys": {
"algorithm:version": {
"expired_ts": # 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
}
}
}
"""
isLeaf = True
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.valid_until_ts = 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] = {
u"key": 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_ts": key.expired,
}
x509_certificate_bytes = crypto.dump_certificate(
crypto.FILETYPE_ASN1,
self.config.tls_certificate
)
sha256_fingerprint = sha256(x509_certificate_bytes).digest()
json_object = {
u"valid_until_ts": self.valid_until_ts,
u"server_name": self.config.server_name,
u"verify_keys": verify_keys,
u"old_verify_keys": old_verify_keys,
u"tls_fingerprints": [{
u"sha256": encode_base64(sha256_fingerprint),
}]
}
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.valid_until_ts:
self.update_response_body(time_now)
return respond_with_json_bytes(
request, 200, self.response_body,
version_string=self.version_string
)
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