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From: Chris Palmer <chris@noncombatant.org>
To: Maxim Dounin <mdounin@mdounin.ru>, freebsd-security@freebsd.org
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Subject: Re: FreeBSD Security Advisory FreeBSD-SA-09:15.ssl
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Maxim Dounin writes:

> It's not true.  Patch (as well as OpenSSL 0.9.8l) breaks only apps that do
> not request client certs in initial handshake, but instead do it via
> renegotiation.  It's not really commonly used feature.

The ideal case is not the typical case:

http://extendedsubset.com/Renegotiating_TLS_pd.pdf

The plain fact is that client cert auth often needs reneg in apps as
deployed in the world. Often, web servers need to check (for example) a
virtual-host-specific configuration before realizing they need to request
client cert auth.