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- # Copyright 2014-2016 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 twisted.internet import ssl
- from OpenSSL import SSL
- from twisted.internet._sslverify import _OpenSSLECCurve, _defaultCurveName
- import logging
- logger = logging.getLogger(__name__)
- class ServerContextFactory(ssl.ContextFactory):
- """Factory for PyOpenSSL SSL contexts that are used to handle incoming
- connections and to make connections to remote servers."""
- def __init__(self, config):
- self._context = SSL.Context(SSL.SSLv23_METHOD)
- self.configure_context(self._context, config)
- @staticmethod
- def configure_context(context, config):
- try:
- _ecCurve = _OpenSSLECCurve(_defaultCurveName)
- _ecCurve.addECKeyToContext(context)
- except:
- logger.exception("Failed to enable elliptic curve for TLS")
- context.set_options(SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3)
- context.use_certificate_chain_file(config.tls_certificate_file)
- if not config.no_tls:
- context.use_privatekey(config.tls_private_key)
- context.load_tmp_dh(config.tls_dh_params_path)
- context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH")
- def getContext(self):
- return self._context
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