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# -*- coding: utf-8 -*-
# Copyright 2014 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 ._base import Config
from OpenSSL import crypto
import subprocess
import os
GENERATE_DH_PARAMS = False
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 = self.check_file(
args.tls_dh_params_path, "tls_dh_params"
)
@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, "tls_certificate")
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, "tls_private_key")
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):
if GENERATE_DH_PARAMS:
subprocess.check_call([
"openssl", "dhparam",
"-outform", "PEM",
"-out", args.tls_dh_params_path,
"2048"
])
else:
with open(args.tls_dh_params_path, "w") as dh_params_file:
dh_params_file.write(
"2048-bit DH parameters taken from rfc3526\n"
"-----BEGIN DH PARAMETERS-----\n"
"MIIBCAKCAQEA///////////JD9qiIWjC"
"NMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n"
"IlFKCHmONATd75UZs806QxswKwpt8l8U"
"N0/hNW1tUcJF5IW1dmJefsb0TELppjft\n"
"awv/XLb0Brft7jhr+1qJn6WunyQRfEsf"
"5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n"
"mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVS"
"u57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n"
"fDKQXkYuNs474553LBgOhgObJ4Oi7Aei"
"j7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n"
"5RXSJhiY+gUQFXKOWoqsqmj/////////"
"/wIBAg==\n"
"-----END DH PARAMETERS-----\n"
)
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