diff --git a/synapse/crypto/config.py b/synapse/crypto/config.py
new file mode 100644
index 0000000000..801dfd8656
--- /dev/null
+++ b/synapse/crypto/config.py
@@ -0,0 +1,159 @@
+# -*- 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.
+
+import ConfigParser as configparser
+import argparse
+import socket
+import sys
+import os
+from OpenSSL import crypto
+import nacl.signing
+from syutil.base64util import encode_base64
+import subprocess
+
+
+def load_config(description, argv):
+ config_parser = argparse.ArgumentParser(add_help=False)
+ config_parser.add_argument("-c", "--config-path", metavar="CONFIG_FILE",
+ help="Specify config file")
+ config_args, remaining_args = config_parser.parse_known_args(argv)
+ if config_args.config_path:
+ config = configparser.SafeConfigParser()
+ config.read([config_args.config_path])
+ defaults = dict(config.items("KeyServer"))
+ else:
+ defaults = {}
+ parser = argparse.ArgumentParser(
+ parents=[config_parser],
+ description=description,
+ formatter_class=argparse.RawDescriptionHelpFormatter,
+ )
+ parser.set_defaults(**defaults)
+ parser.add_argument("--server-name", default=socket.getfqdn(),
+ help="The name of the server")
+ parser.add_argument("--signing-key-path",
+ help="The signing key to sign responses with")
+ parser.add_argument("--tls-certificate-path",
+ help="PEM encoded X509 certificate for TLS")
+ parser.add_argument("--tls-private-key-path",
+ help="PEM encoded private key for TLS")
+ parser.add_argument("--tls-dh-params-path",
+ help="PEM encoded dh parameters for ephemeral keys")
+ parser.add_argument("--bind-port", type=int,
+ help="TCP port to listen on")
+ parser.add_argument("--bind-host", default="",
+ help="Local interface to listen on")
+
+ args = parser.parse_args(remaining_args)
+
+ server_config = vars(args)
+ del server_config["config_path"]
+ return server_config
+
+
+def generate_config(argv):
+ parser = argparse.ArgumentParser()
+ parser.add_argument("-c", "--config-path", help="Specify config file",
+ metavar="CONFIG_FILE", required=True)
+ parser.add_argument("--server-name", default=socket.getfqdn(),
+ help="The name of the server")
+ parser.add_argument("--signing-key-path",
+ help="The signing key to sign responses with")
+ parser.add_argument("--tls-certificate-path",
+ help="PEM encoded X509 certificate for TLS")
+ parser.add_argument("--tls-private-key-path",
+ help="PEM encoded private key for TLS")
+ parser.add_argument("--tls-dh-params-path",
+ help="PEM encoded dh parameters for ephemeral keys")
+ parser.add_argument("--bind-port", type=int, required=True,
+ help="TCP port to listen on")
+ parser.add_argument("--bind-host", default="",
+ help="Local interface to listen on")
+
+ args = parser.parse_args(argv)
+
+ dir_name = os.path.dirname(args.config_path)
+ base_key_name = os.path.join(dir_name, args.server_name)
+
+ if args.signing_key_path is None:
+ args.signing_key_path = base_key_name + ".signing.key"
+
+ if args.tls_certificate_path is None:
+ args.tls_certificate_path = base_key_name + ".tls.crt"
+
+ if args.tls_private_key_path is None:
+ args.tls_private_key_path = base_key_name + ".tls.key"
+
+ if args.tls_dh_params_path is None:
+ args.tls_dh_params_path = base_key_name + ".tls.dh"
+
+ if not os.path.exists(args.signing_key_path):
+ with open(args.signing_key_path, "w") as signing_key_file:
+ key = nacl.signing.SigningKey.generate()
+ signing_key_file.write(encode_base64(key.encode()))
+
+ if not os.path.exists(args.tls_private_key_path):
+ with open(args.tls_private_key_path, "w") as private_key_file:
+ tls_private_key = crypto.PKey()
+ tls_private_key.generate_key(crypto.TYPE_RSA, 2048)
+ private_key_pem = crypto.dump_privatekey(
+ crypto.FILETYPE_PEM, tls_private_key
+ )
+ private_key_file.write(private_key_pem)
+ else:
+ with open(args.tls_private_key_path) as private_key_file:
+ private_key_pem = private_key_file.read()
+ tls_private_key = crypto.load_privatekey(
+ crypto.FILETYPE_PEM, private_key_pem
+ )
+
+ if not os.path.exists(args.tls_certificate_path):
+ with open(args.tls_certificate_path, "w") as certifcate_file:
+ cert = crypto.X509()
+ subject = cert.get_subject()
+ subject.CN = args.server_name
+
+ cert.set_serial_number(1000)
+ cert.gmtime_adj_notBefore(0)
+ cert.gmtime_adj_notAfter(10 * 365 * 24 * 60 * 60)
+ cert.set_issuer(cert.get_subject())
+ cert.set_pubkey(tls_private_key)
+
+ cert.sign(tls_private_key, 'sha256')
+
+ cert_pem = crypto.dump_certificate(crypto.FILETYPE_PEM, cert)
+
+ certifcate_file.write(cert_pem)
+
+ if not os.path.exists(args.tls_dh_params_path):
+ subprocess.check_call([
+ "openssl", "dhparam",
+ "-outform", "PEM",
+ "-out", args.tls_dh_params_path,
+ "2048"
+ ])
+
+ config = configparser.SafeConfigParser()
+ config.add_section("KeyServer")
+ for key, value in vars(args).items():
+ if key != "config_path":
+ config.set("KeyServer", key, str(value))
+
+ with open(args.config_path, "w") as config_file:
+ config.write(config_file)
+
+
+if __name__ == "__main__":
+ generate_config(sys.argv[1:])
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