bug#46779: GnuTLS uses the hard-coded /etc/ssl/certs location for TLS certificates

[Roel Janssen]

On Fri, 2021-03-19 at 19:13 -0400, Mark H Weaver wrote:
> Ludovic Courtès <ludo@gnu.org> writes:
> 
> > Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
> > 
> > > We should patch GnuTLS so that it also honors the SSL_*
> > > environment
> > > variables documented in the Guix manual.
> > 
> > Note that (1) the SSL_* variables are originally from OpenSSL, and
> > (2)
> > GnuTLS developers made the conscious decision to not honor any
> > environment variable, leaving it up to application developers to do
> > that.
> > 
> > That’s the reason we are in this situation.  See the thread at
> > <
> > https://lists.gnu.org/archive/html/guix-devel/2014-02/msg00237.html
> > >.
> 
> That thread is worth reading, but for those who are short on time, I
> want to call attention to a specific point I made:
> 
>   However, GnuTLS does not support an environment variable setting,
> so we
>   would have to patch the code (add_system_trust in lib/system.c).  I
>   strongly considered doing this, but I'm worried about the possible
>   security implications.  For example, consider a setuid program that
> uses
>   GnuTLS and assumes that the person who ran the program will not be
>   capable of changing the trust store that GnuTLS uses.  This
> assumption
>   would be correct for the upstream GnuTLS, but not for ours.
> 
> <https://lists.gnu.org/archive/html/guix-devel/2014-02/msg00245.html>
> 

Would it be an idea to propose the patches, or the idea, for supporting
the SSL_* variables to the GnuTLS developers? Or is there a more
fundamental reason why GnuTLS does not support changing certificate
stores at run-time?

Perhaps I have missed a solution that has already made it in Guix. If
that is the case, I would like to know about it. :)

Kind regards,
Roel Janssen