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Re: Gajim fails to handle invalid certificates
From: Florian Weimer <fweimer () redhat com>
Date: Wed, 14 Nov 2012 10:19:37 +0100

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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