151 lines
4.1 KiB
Python
151 lines
4.1 KiB
Python
# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os.path
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import subprocess
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from zope.interface import implementer
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from OpenSSL import SSL
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from OpenSSL.SSL import Connection
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from twisted.internet.interfaces import IOpenSSLServerConnectionCreator
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from twisted.internet.ssl import Certificate, trustRootFromCertificates
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from twisted.web.client import BrowserLikePolicyForHTTPS # noqa: F401
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from twisted.web.iweb import IPolicyForHTTPS # noqa: F401
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def get_test_https_policy():
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"""Get a test IPolicyForHTTPS which trusts the test CA cert
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Returns:
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IPolicyForHTTPS
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"""
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ca_file = get_test_ca_cert_file()
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with open(ca_file) as stream:
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content = stream.read()
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cert = Certificate.loadPEM(content)
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trust_root = trustRootFromCertificates([cert])
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return BrowserLikePolicyForHTTPS(trustRoot=trust_root)
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def get_test_ca_cert_file():
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"""Get the path to the test CA cert
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The keypair is generated with:
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openssl genrsa -out ca.key 2048
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openssl req -new -x509 -key ca.key -days 3650 -out ca.crt \
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-subj '/CN=synapse test CA'
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"""
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return os.path.join(os.path.dirname(__file__), "ca.crt")
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def get_test_key_file():
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"""get the path to the test key
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The key file is made with:
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openssl genrsa -out server.key 2048
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"""
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return os.path.join(os.path.dirname(__file__), "server.key")
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cert_file_count = 0
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CONFIG_TEMPLATE = b"""\
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[default]
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basicConstraints = CA:FALSE
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keyUsage=nonRepudiation, digitalSignature, keyEncipherment
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subjectAltName = %(sanentries)s
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"""
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def create_test_cert_file(sanlist):
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"""build an x509 certificate file
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Args:
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sanlist: list[bytes]: a list of subjectAltName values for the cert
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Returns:
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str: the path to the file
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"""
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global cert_file_count
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csr_filename = "server.csr"
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cnf_filename = "server.%i.cnf" % (cert_file_count,)
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cert_filename = "server.%i.crt" % (cert_file_count,)
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cert_file_count += 1
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# first build a CSR
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subprocess.check_call(
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[
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"openssl",
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"req",
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"-new",
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"-key",
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get_test_key_file(),
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"-subj",
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"/",
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"-out",
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csr_filename,
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]
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)
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# now a config file describing the right SAN entries
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sanentries = b",".join(sanlist)
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with open(cnf_filename, "wb") as f:
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f.write(CONFIG_TEMPLATE % {b"sanentries": sanentries})
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# finally the cert
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ca_key_filename = os.path.join(os.path.dirname(__file__), "ca.key")
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ca_cert_filename = get_test_ca_cert_file()
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subprocess.check_call(
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[
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"openssl",
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"x509",
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"-req",
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"-in",
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csr_filename,
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"-CA",
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ca_cert_filename,
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"-CAkey",
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ca_key_filename,
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"-set_serial",
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"1",
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"-extfile",
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cnf_filename,
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"-out",
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cert_filename,
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]
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)
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return cert_filename
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@implementer(IOpenSSLServerConnectionCreator)
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class TestServerTLSConnectionFactory:
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"""An SSL connection creator which returns connections which present a certificate
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signed by our test CA."""
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def __init__(self, sanlist):
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"""
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Args:
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sanlist: list[bytes]: a list of subjectAltName values for the cert
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"""
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self._cert_file = create_test_cert_file(sanlist)
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def serverConnectionForTLS(self, tlsProtocol):
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ctx = SSL.Context(SSL.SSLv23_METHOD)
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ctx.use_certificate_file(self._cert_file)
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ctx.use_privatekey_file(get_test_key_file())
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return Connection(ctx, None)
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