[Xen-devel] QEMU-TRAD Re: [PATCH] Fixed building with newer GNUTLS versions.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Mar 31, 2016 at 10:58:19PM +0200, Sjoer van der Ploeg wrote:

Heya!

Thank you for posting this and also adding the #ifdef for older
versions!

Was wondering thought - had you double-checked that the new
code path works with the certs?

Thanks!

P.S.
CC-ing Ian who is the QEMU-traditional maintainer.
> Signed-off-by: Sjoer van der Ploeg <sfjuocekr@xxxxxxxxx>
> ---
>  vnc.c | 71 
> +++++++++++++++++++++++++++++++++++++++++++++----------------------
>  1 file changed, 48 insertions(+), 23 deletions(-)
> 
> diff --git a/vnc.c b/vnc.c
> index 573af3b..61d1555 100644
> --- a/vnc.c
> +++ b/vnc.c
> @@ -1925,9 +1925,9 @@ static int vnc_tls_initialize(void)
>      return 1;
>  }
>  
> -static gnutls_anon_server_credentials vnc_tls_initialize_anon_cred(void)
> +static gnutls_anon_server_credentials_t vnc_tls_initialize_anon_cred(void)
>  {
> -    gnutls_anon_server_credentials anon_cred;
> +    gnutls_anon_server_credentials_t anon_cred;
>      int ret;
>  
>      if ((ret = gnutls_anon_allocate_server_credentials(&anon_cred)) < 0) {
> @@ -2151,13 +2151,52 @@ static void vnc_handshake_io(void *opaque) {
>       (vs)->subauth == VNC_AUTH_VENCRYPT_X509VNC ||    \
>       (vs)->subauth == VNC_AUTH_VENCRYPT_X509PLAIN)
>  
> +#if defined(GNUTLS_VERSION_NUMBER) && \
> +    GNUTLS_VERSION_NUMBER >= 0x020200 /* 2.2.0 */
> +static int vnc_set_gnutls_priority(gnutls_session_t s, int x509)
> +{
> +    const char *priority = x509 ? "NORMAL" : "NORMAL:+ANON-DH";
> +    int rc;
>  
> -static int vnc_start_tls(struct VncState *vs) {
> -    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};
> +    rc = gnutls_priority_set_direct(s, priority, NULL);
> +    if (rc != GNUTLS_E_SUCCESS) {
> +        return -1;
> +    }
> +    return 0;
> +}
> +#else
> +static int vnc_set_gnutls_priority(gnutls_session_t s, int x509)
> +{
> +    static const int cert_types[] = { GNUTLS_CRT_X509, 0 };
> +    static const int protocols[] = {
> +        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
> +    };
> +    int rc;
> +
> +    rc = gnutls_kx_set_priority(s, x509 ? kx_x509 : kx_anon);
> +    if (rc != GNUTLS_E_SUCCESS) {
> +        return -1;
> +    }
> +
> +    rc = gnutls_certificate_type_set_priority(s, cert_types);
> +    if (rc != GNUTLS_E_SUCCESS) {
> +        return -1;
> +    }
>  
> +    rc = gnutls_protocol_set_priority(s, protocols);
> +    if (rc != GNUTLS_E_SUCCESS) {
> +        return -1;
> +    }
> +    return 0;
> +}
> +#endif
> +
> +static int vnc_start_tls(struct VncState *vs) {
>      VNC_DEBUG("Do TLS setup\n");
>      if (vnc_tls_initialize() < 0) {
>       VNC_DEBUG("Failed to init TLS\n");
> @@ -2177,21 +2216,7 @@ static int vnc_start_tls(struct VncState *vs) {
>           return -1;
>       }
>  
> -     if (gnutls_kx_set_priority(vs->tls_session, NEED_X509_AUTH(vs) ? 
> 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 (vnc_set_gnutls_priority(vs->tls_session, !!NEED_X509_AUTH(vs)) < 0) 
> {
>           gnutls_deinit(vs->tls_session);
>           vs->tls_session = NULL;
>           vnc_client_error(vs);
> @@ -2219,7 +2244,7 @@ static int vnc_start_tls(struct VncState *vs) {
>           }
>  
>       } else {
> -         gnutls_anon_server_credentials anon_cred = 
> vnc_tls_initialize_anon_cred();
> +         gnutls_anon_server_credentials_t anon_cred = 
> vnc_tls_initialize_anon_cred();
>           if (!anon_cred) {
>               gnutls_deinit(vs->tls_session);
>               vs->tls_session = NULL;
> -- 
> 2.8.0.rc3
> 
> 
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