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