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Here is a patch, ready for review. Seems to work, though I still need to check it with some other implementation.
I have chosen not to expose another three OpenSSL functions (SSL_get_finished, SSL_get_peer_finished, SSL_session_reused), but provide API just for getting the channel binding. If OpenSSL provides a better API some day (gnutls already has a dedicated function), we can use that.
The method added to SSLSocket - get_channel_binding() currently can return only the 'tls-unique' channel binding type, but can be easily extended for other types, which also may be easier to get from the C module.