Support for sending and receiving TLS hello extensions and TLS supplemental data messages has recently been added to the OpenSSL GitHub master branch.
I’ve submitted a patch to mod_ssl which allows third-party modules to send and receive TLS hello extensions and TLS supplemental data via optional hooks and functions. The patch can be found here: https://issues.apache.org/bugzilla/show_bug.cgi?id=55467 I’m happy to update the patch based on feedback. Thanks much, Scott Deboy
