Re: [Qemu-devel] [PATCH 1/3] Avoid the use of deprecated gnutls gnutls_*_set_priority functions.

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Aug 25, 2011 at 11:54:41AM +0100, Stefan Hajnoczi wrote:
> On Mon, Jul 4, 2011 at 11:00 PM, Raghavendra D Prabhu
> <raghu.prabhu13@gmail.com> wrote:
> > The gnutls_*_set_priority family of functions has been marked deprecated
> > in 2.12.x. These functions have been superceded by
> > gnutls_priority_set_direct().
> >
> > Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
> > ---
> >  ui/vnc-tls.c |   20 +-------------------
> >  1 files changed, 1 insertions(+), 19 deletions(-)
> >
> > diff --git a/ui/vnc-tls.c b/ui/vnc-tls.c
> > index dec626c..33a5d8c 100644
> > --- a/ui/vnc-tls.c
> > +++ b/ui/vnc-tls.c
> > @@ -286,10 +286,6 @@ int vnc_tls_validate_certificate(struct VncState *vs)
> >
> >  int vnc_tls_client_setup(struct VncState *vs,
> >                          int needX509Creds) {
> > -    static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
> > -    static const int protocol_priority[]= { GNUTLS_TLS1_1, GNUTLS_TLS1_0, GNUTLS_SSL3, 0 };
> > -    static const int kx_anon[] = {GNUTLS_KX_ANON_DH, 0};
> > -    static const int kx_x509[] = {GNUTLS_KX_DHE_DSS, GNUTLS_KX_RSA, GNUTLS_KX_DHE_RSA, GNUTLS_KX_SRP, 0};
> >
> >     VNC_DEBUG("Do TLS setup\n");
> >     if (vnc_tls_initialize() < 0) {
> > @@ -310,21 +306,7 @@ int vnc_tls_client_setup(struct VncState *vs,
> >             return -1;
> >         }
> >
> > -        if (gnutls_kx_set_priority(vs->tls.session, needX509Creds ? kx_x509 : kx_anon) < 0) {
> > -            gnutls_deinit(vs->tls.session);
> > -            vs->tls.session = NULL;
> > -            vnc_client_error(vs);
> > -            return -1;
> > -        }
> > -
> > -        if (gnutls_certificate_type_set_priority(vs->tls.session, cert_type_priority) < 0) {
> > -            gnutls_deinit(vs->tls.session);
> > -            vs->tls.session = NULL;
> > -            vnc_client_error(vs);
> > -            return -1;
> > -        }
> > -
> > -        if (gnutls_protocol_set_priority(vs->tls.session, protocol_priority) < 0) {
> > +        if (gnutls_priority_set_direct(vs->tls.session, needX509Creds ? "NORMAL" : "NORMAL:+ANON-DH", NULL) < 0) {
> >             gnutls_deinit(vs->tls.session);
> >             vs->tls.session = NULL;
> >             vnc_client_error(vs);
> > --
> > 1.7.6
> 
> Daniel,
> This patch looks good to me but I don't know much about gnutls or
> crypto in general.  Would you be willing to review this?

ACK, this approach is different from what I did in libvirt, but it matches
the recommendations in the GNUTLS manual for setting priority, so I believe
it is good.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

Regards,
Daniel
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