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# -*- coding: utf-8 -*-
# Copyright 2019 New Vector 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.
import os.path
import subprocess
from zope.interface import implementer
from OpenSSL import SSL
from OpenSSL.SSL import Connection
from twisted.internet.interfaces import IOpenSSLServerConnectionCreator
def get_test_ca_cert_file():
"""Get the path to the test CA cert
The keypair is generated with:
openssl genrsa -out ca.key 2048
openssl req -new -x509 -key ca.key -days 3650 -out ca.crt \
-subj '/CN=synapse test CA'
"""
return os.path.join(os.path.dirname(__file__), "ca.crt")
def get_test_key_file():
"""get the path to the test key
The key file is made with:
openssl genrsa -out server.key 2048
"""
return os.path.join(os.path.dirname(__file__), "server.key")
cert_file_count = 0
CONFIG_TEMPLATE = b"""\
[default]
basicConstraints = CA:FALSE
keyUsage=nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = %(sanentries)b
"""
def create_test_cert_file(sanlist):
"""build an x509 certificate file
Args:
sanlist: list[bytes]: a list of subjectAltName values for the cert
Returns:
str: the path to the file
"""
global cert_file_count
csr_filename = "server.csr"
cnf_filename = "server.%i.cnf" % (cert_file_count,)
cert_filename = "server.%i.crt" % (cert_file_count,)
cert_file_count += 1
# first build a CSR
subprocess.run(
[
"openssl",
"req",
"-new",
"-key",
get_test_key_file(),
"-subj",
"/",
"-out",
csr_filename,
],
check=True,
)
# now a config file describing the right SAN entries
sanentries = b",".join(sanlist)
with open(cnf_filename, "wb") as f:
f.write(CONFIG_TEMPLATE % {b"sanentries": sanentries})
# finally the cert
ca_key_filename = os.path.join(os.path.dirname(__file__), "ca.key")
ca_cert_filename = get_test_ca_cert_file()
subprocess.run(
[
"openssl",
"x509",
"-req",
"-in",
csr_filename,
"-CA",
ca_cert_filename,
"-CAkey",
ca_key_filename,
"-set_serial",
"1",
"-extfile",
cnf_filename,
"-out",
cert_filename,
],
check=True,
)
return cert_filename
@implementer(IOpenSSLServerConnectionCreator)
class TestServerTLSConnectionFactory(object):
"""An SSL connection creator which returns connections which present a certificate
signed by our test CA."""
def __init__(self, sanlist):
"""
Args:
sanlist: list[bytes]: a list of subjectAltName values for the cert
"""
self._cert_file = create_test_cert_file(sanlist)
def serverConnectionForTLS(self, tlsProtocol):
ctx = SSL.Context(SSL.TLSv1_METHOD)
ctx.use_certificate_file(self._cert_file)
ctx.use_privatekey_file(get_test_key_file())
return Connection(ctx, None)
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