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Add a comment about SSLv23_METHOD (#8043)

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Richard van der Hoff 2020-08-07 15:14:29 +01:00 committed by GitHub
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changelog.d/8043.misc Normal file
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@ -0,0 +1 @@
Add a comment to `ServerContextFactory` about the use of `SSLv23_METHOD`.

8
synapse/crypto/context_factory.py
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@ -48,6 +48,14 @@ class ServerContextFactory(ContextFactory):
connections."""
def __init__(self, config):
# TODO: once pyOpenSSL exposes TLS_METHOD and SSL_CTX_set_min_proto_version,
# switch to those (see https://github.com/pyca/cryptography/issues/5379).
#
# note that, despite the confusing name, SSLv23_METHOD does *not* enforce SSLv2
# or v3, but is a synonym for TLS_METHOD, which allows the client and server
# to negotiate an appropriate version of TLS constrained by the version options
# set with context.set_options.
#
self._context = SSL.Context(SSL.SSLv23_METHOD)
self.configure_context(self._context, config)