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bug#9017: 24.0.50; gnutls.c:  (Emacs) fatal error: Key usage violatio
bug#9017: 24.0.50; gnutls.c:  (Emacs) fatal error: Key usage violation in certificate has been detected.
Wed, 25 Jan 2012 16:32:52 -0600
Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.92 (gnu/linux)
On Wed, 25 Jan 2012 20:39:56 +0100 Lars Ingebrigtsen <address@hidden> wrote:
LI> Ted Zlatanov <address@hidden> writes:
>> gnutls.c:  (Emacs) fatal error: Key usage violation in certificate
>> has been detected.
>> we should at least tell the user "hey, maybe
>> (setq gnutls-algorithm-priority "normal:-dhe-rsa"
>> would work for you. Do you want to try it?"
>> I don't think it should be tried automatically. That's convenient but
>> insecure. The priority string above basically disables security.
LI> Oh, I thought it just disabled the dhe-rsa-algorithm? Which would then
LI> allow gnutls to fall back on different algos?
>From Nikos' reply recommending -dhe-rsa:
"This certificate restricts its usage to key encipherment. For TLS this
is restricted to only the RSA key exchange. By misconfiguration however
the server allows you to connect with a ciphersuite that violates this
usage and that's why gnutls-cli fails to connect."
I may be misunderstanding the intent, but I thought globally you're
saying you'll allow restricted certificates. I'm not sure that's ideal
and I think it is insecure, but I'm not so sure anymore after thinking
about it more carefully.
Either way it seems that `gnutls-algorithm-priority' will have to be one
of those string-or-alist-or-function variables, so you can disable
security altogether for specific hosts that need it. I can add that
support if you think it's reasonable.