Christian Heimes added the comment:
Thanks for your patch. There might be a simpler way. By default a SSLContext
only caches server sessions. You can enable client session caching with:
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_CLIENT)
This may be sufficient for FTP over TLS since both sockets are created from the
same context.
The new patch has a flaw. With the new SSLSession object a user could attempt
to reuse a SSLSession with a different SSLContext. That's going to break
OpenSSL.
>From SSL_set_session(3)
NOTES
SSL_SESSION objects keep internal link information about the session
cache list, when being inserted into one SSL_CTX object's session cache. One
SSL_SESSION object, regardless of its reference count, must therefore only be
used with one SSL_CTX object (and the SSL objects created from this SSL_CTX
object).
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<http://bugs.python.org/issue19500>
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