1 files changed, 110 insertions, 0 deletions
diff --git a/synapse/crypto/keyserver.py b/synapse/crypto/keyserver.py
new file mode 100644
index 0000000000..48bd380781
--- /dev/null
+++ b/synapse/crypto/keyserver.py
@@ -0,0 +1,110 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 matrix.org
+#
+# 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.internet import reactor, ssl
+from twisted.web import server
+from twisted.web.resource import Resource
+from twisted.python.log import PythonLoggingObserver
+
+from synapse.crypto.resource.key import LocalKey
+from synapse.crypto.config import load_config
+
+from syutil.base64util import decode_base64
+
+from OpenSSL import crypto, SSL
+
+import logging
+import nacl.signing
+import sys
+
+
+class KeyServerSSLContextFactory(ssl.ContextFactory):
+    """Factory for PyOpenSSL SSL contexts that are used to handle incoming
+    connections and to make connections to remote servers."""
+
+    def __init__(self, key_server):
+        self._context = SSL.Context(SSL.SSLv23_METHOD)
+        self.configure_context(self._context, key_server)
+
+    @staticmethod
+    def configure_context(context, key_server):
+        context.set_options(SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3)
+        context.use_certificate(key_server.tls_certificate)
+        context.use_privatekey(key_server.tls_private_key)
+        context.load_tmp_dh(key_server.tls_dh_params_path)
+        context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH")
+
+    def getContext(self):
+        return self._context
+
+
+class KeyServer(object):
+    """An HTTPS server serving LocalKey and RemoteKey resources."""
+
+    def __init__(self, server_name, tls_certificate_path, tls_private_key_path,
+                 tls_dh_params_path, signing_key_path, bind_host, bind_port):
+        self.server_name = server_name
+        self.tls_certificate = self.read_tls_certificate(tls_certificate_path)
+        self.tls_private_key = self.read_tls_private_key(tls_private_key_path)
+        self.tls_dh_params_path = tls_dh_params_path
+        self.signing_key = self.read_signing_key(signing_key_path)
+        self.bind_host = bind_host
+        self.bind_port = int(bind_port)
+        self.ssl_context_factory = KeyServerSSLContextFactory(self)
+
+    @staticmethod
+    def read_tls_certificate(cert_path):
+        with open(cert_path) as cert_file:
+            cert_pem = cert_file.read()
+            return crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
+
+    @staticmethod
+    def read_tls_private_key(private_key_path):
+        with open(private_key_path) as private_key_file:
+            private_key_pem = private_key_file.read()
+            return crypto.load_privatekey(crypto.FILETYPE_PEM, private_key_pem)
+
+    @staticmethod
+    def read_signing_key(signing_key_path):
+        with open(signing_key_path) as signing_key_file:
+            signing_key_b64 = signing_key_file.read()
+            signing_key_bytes = decode_base64(signing_key_b64)
+            return nacl.signing.SigningKey(signing_key_bytes)
+
+    def run(self):
+        root = Resource()
+        root.putChild("key", LocalKey(self))
+        site = server.Site(root)
+        reactor.listenSSL(
+            self.bind_port,
+            site,
+            self.ssl_context_factory,
+            interface=self.bind_host
+        )
+
+        logging.basicConfig(level=logging.DEBUG)
+        observer = PythonLoggingObserver()
+        observer.start()
+
+        reactor.run()
+
+
+def main():
+    key_server = KeyServer(**load_config(__doc__, sys.argv[1:]))
+    key_server.run()
+
+
+if __name__ == "__main__":
+    main()