Google Code-In 2014
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LightMelody: SASL EXTERNAL MechanismCopyleft Games Group

XMPP uses SASL (Simple Authentication and Security Layer) for user authentication which supports a variety of different authentication mechanisms. One of them, "EXTERNAL", allows authenticating with a TLS client certificate.

Add support for providing a TLS client certificate and using it for SASL EXTERNAL authentication. You may need to setup a test server to test this.

While working on this task you should join and remain in #CopyleftGames on Freenode to get help, feedback, and guidance from mentors and other developers. Code updates which may affect your work are also announced here as they happen.

When you've done, commit your work and post the resulting changeset url to this task.