[Xen-devel] [PATCH for-qemu-trad] Fix build with newer version of GNUTLS

[Wei Liu <wei.liu2@xxxxxxxxxx>]

gnutls_kx_set_priority, gnutls_certificate_type_set_priority and
gnutls_protocol_set_priority were deprecated and eventually removed in
GNUTLS 3.4. Application should use gnutls_priority_set_direct instead
per [0].

gnutls_anon_server_credentials was deprecated at some point. Application
should use gnutls_anon_server_credentials_t instead.

Provide compatibility layer for QEMU traditional. This commit is in fact
backport of two upstream QEMU commits:
1. f40d55081667a716312b9a8b6e13835c4074f56b
2. 7d2a929feba319c18603e324b1750830d6c8b7a1

[0] 
https://www.gnutls.org/manual/html_node/Upgrading-from-previous-versions.html

Signed-off-by: Sjoer van der Ploeg <sfjuocekr@xxxxxxxxx>
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 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;
-- 
2.1.4


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