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Date: Wed, 14 Nov 2012 10:19:37 +0100
From: Florian Weimer <fweimer@...hat.com>
To: kseifried@...hat.com
CC: oss-security@...ts.openwall.com
Subject: Re: Gajim fails to handle invalid certificates
On 11/14/2012 08:19 AM, Kurt Seiifried wrote:
> So do we consider this to be an OpenSSL issue of gajim? I'm sure gajim
> is not the only program that does something like this.
As far as I understand things, it is not necessarily at all to set a
verification callback in OpenSSL. If you load the root certificate
store and examine SSL_get_verify_result, that should be sufficient. You
can even look at the peer certificate and continue anyway if the user
has overridden the certificate validity. So far, I haven't found a good
reason to use a verify callback at all. You need it to implement a
custom PKIX validation policy, but that should be pretty rare. (I still
have to check older OpenSSL versions, though, perhaps there, the
behavior was different.)
Anyway, if application developers set a verification callback, it is
their responsibility to implement it correctly. Therefore, I don't
think this is an OpenSSL issue.
--
Florian Weimer / Red Hat Product Security Team
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