mirror of
https://mau.dev/maunium/synapse.git
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162 lines
5.5 KiB
Python
162 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 matrix.org
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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 twisted.web.server import NOT_DONE_YET
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from twisted.internet import defer
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from synapse.http.server import respond_with_json_bytes
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from synapse.crypto.keyclient import fetch_server_key
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from syutil.crypto.jsonsign import sign_json, verify_signed_json
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from syutil.base64util import encode_base64, decode_base64
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from syutil.jsonutil import encode_canonical_json
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from OpenSSL import crypto
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from nacl.signing import VerifyKey
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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 /key 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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"server_name": "this.server.example.com"
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"signature_verify_key": # base64 encoded NACL verification key.
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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": # NACL signature for this server.
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}
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}
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"""
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def __init__(self, key_server):
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self.key_server = key_server
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self.response_body = encode_canonical_json(
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self.response_json_object(key_server)
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)
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Resource.__init__(self)
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@staticmethod
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def response_json_object(key_server):
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verify_key_bytes = key_server.signing_key.verify_key.encode()
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x509_certificate_bytes = crypto.dump_certificate(
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crypto.FILETYPE_ASN1,
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key_server.tls_certificate
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)
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json_object = {
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u"server_name": key_server.server_name,
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u"signature_verify_key": encode_base64(verify_key_bytes),
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u"tls_certificate": encode_base64(x509_certificate_bytes)
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}
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signed_json = sign_json(
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json_object,
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key_server.server_name,
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key_server.signing_key
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)
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return signed_json
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def getChild(self, name, request):
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logger.info("getChild %s %s", name, request)
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if name == '':
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return self
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else:
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return RemoteKey(name, self.key_server)
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def render_GET(self, request):
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return respond_with_json_bytes(request, 200, self.response_body)
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class RemoteKey(Resource):
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"""HTTP resource for retreiving the TLS certificate and NACL signature
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verification keys for a another server. Checks that the reported X.509 TLS
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certificate matches the one used in the HTTPS connection. Checks that the
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NACL signature for the remote server is valid. Returns JSON signed by both
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the remote server and by this server.
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GET /key/remote.server.example.com 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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"server_name": "remote.server.example.com"
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"signature_verify_key": # base64 encoded NACL verification key.
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"tls_certificate": # base64 ASN.1 DER encoded X.509 tls cert.
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"signatures": {
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"remote.server.example.com": # NACL signature for remote server.
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"this.server.example.com": # NACL signature for this server.
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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, server_name, key_server):
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self.server_name = server_name
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self.key_server = key_server
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Resource.__init__(self)
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def render_GET(self, request):
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self._async_render_GET(request)
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return NOT_DONE_YET
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@defer.inlineCallbacks
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def _async_render_GET(self, request):
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try:
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server_keys, certificate = yield fetch_server_key(
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self.server_name,
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self.key_server.ssl_context_factory
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)
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resp_server_name = server_keys[u"server_name"]
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verify_key_b64 = server_keys[u"signature_verify_key"]
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tls_certificate_b64 = server_keys[u"tls_certificate"]
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verify_key = VerifyKey(decode_base64(verify_key_b64))
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if resp_server_name != self.server_name:
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raise ValueError("Wrong server name '%s' != '%s'" %
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(resp_server_name, self.server_name))
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x509_certificate_bytes = crypto.dump_certificate(
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crypto.FILETYPE_ASN1,
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certificate
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)
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if encode_base64(x509_certificate_bytes) != tls_certificate_b64:
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raise ValueError("TLS certificate doesn't match")
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verify_signed_json(server_keys, self.server_name, verify_key)
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signed_json = sign_json(
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server_keys,
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self.key_server.server_name,
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self.key_server.signing_key
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)
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json_bytes = encode_canonical_json(signed_json)
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respond_with_json_bytes(request, 200, json_bytes)
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except Exception as e:
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json_bytes = encode_canonical_json({
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u"error": {u"code": 502, u"message": e.message}
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})
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respond_with_json_bytes(request, 502, json_bytes)
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