diff --git a/synapse/config/tls.py b/synapse/config/tls.py
new file mode 100644
index 0000000000..c65487ceb9
--- /dev/null
+++ b/synapse/config/tls.py
@@ -0,0 +1,106 @@
+# -*- 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 ._base import Config
+
+from OpenSSL import crypto
+import subprocess
+import os
+
+class TlsConfig(Config):
+ def __init__(self, args):
+ super(TlsConfig, self).__init__(args)
+ self.tls_certificate = self.read_tls_certificate(
+ args.tls_certificate_path
+ )
+ self.tls_private_key = self.read_tls_private_key(
+ args.tls_private_key_path
+ )
+ self.tls_dh_params_path = args.tls_dh_params_path
+
+ @classmethod
+ def add_arguments(cls, parser):
+ super(TlsConfig, cls).add_arguments(parser)
+ tls_group = parser.add_argument_group("tls")
+ tls_group.add_argument("--tls-certificate-path",
+ help="PEM encoded X509 certificate for TLS")
+ tls_group.add_argument("--tls-private-key-path",
+ help="PEM encoded private key for TLS")
+ tls_group.add_argument("--tls-dh-params-path",
+ help="PEM dh parameters for ephemeral keys")
+
+ def read_tls_certificate(self, cert_path):
+ cert_pem = self.read_file(cert_path)
+ return crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
+
+ def read_tls_private_key(self, private_key_path):
+ private_key_pem = self.read_file(private_key_path)
+ return crypto.load_privatekey(crypto.FILETYPE_PEM, private_key_pem)
+
+ @classmethod
+ def generate_config(cls, args, config_dir_path):
+ super(TlsConfig, cls).generate_config(args, config_dir_path)
+ base_key_name = os.path.join(config_dir_path, args.server_name)
+
+ 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.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"
+ ])
+
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