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-rw-r--r--vnc.c127
1 files changed, 107 insertions, 20 deletions
diff --git a/vnc.c b/vnc.c
index b1f62cac78..9012519883 100644
--- a/vnc.c
+++ b/vnc.c
@@ -105,6 +105,14 @@ enum {
VNC_AUTH_VENCRYPT_X509VNC = 261,
VNC_AUTH_VENCRYPT_X509PLAIN = 262,
};
+
+#if CONFIG_VNC_TLS
+#define X509_CA_CERT_FILE "ca-cert.pem"
+#define X509_CA_CRL_FILE "ca-crl.pem"
+#define X509_SERVER_KEY_FILE "server-key.pem"
+#define X509_SERVER_CERT_FILE "server-cert.pem"
+#endif
+
#endif /* CONFIG_VNC_TLS */
struct VncState
@@ -1377,16 +1385,60 @@ static gnutls_anon_server_credentials vnc_tls_initialize_anon_cred(void)
}
+static gnutls_certificate_credentials_t vnc_tls_initialize_x509_cred(void)
+{
+ gnutls_certificate_credentials_t x509_cred;
+ int ret;
+ struct stat st;
+
+ if ((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0) {
+ VNC_DEBUG("Cannot allocate credentials %s\n", gnutls_strerror(ret));
+ return NULL;
+ }
+ if ((ret = gnutls_certificate_set_x509_trust_file(x509_cred, X509_CA_CERT_FILE, GNUTLS_X509_FMT_PEM)) < 0) {
+ VNC_DEBUG("Cannot load CA certificate %s\n", gnutls_strerror(ret));
+ gnutls_certificate_free_credentials(x509_cred);
+ return NULL;
+ }
+
+ if ((ret = gnutls_certificate_set_x509_key_file (x509_cred, X509_SERVER_CERT_FILE,
+ X509_SERVER_KEY_FILE,
+ GNUTLS_X509_FMT_PEM)) < 0) {
+ VNC_DEBUG("Cannot load certificate & key %s\n", gnutls_strerror(ret));
+ gnutls_certificate_free_credentials(x509_cred);
+ return NULL;
+ }
+
+ if (stat(X509_CA_CRL_FILE, &st) < 0) {
+ if (errno != ENOENT) {
+ gnutls_certificate_free_credentials(x509_cred);
+ return NULL;
+ }
+ } else {
+ if ((ret = gnutls_certificate_set_x509_crl_file(x509_cred, X509_CA_CRL_FILE, GNUTLS_X509_FMT_PEM)) < 0) {
+ VNC_DEBUG("Cannot load CRL %s\n", gnutls_strerror(ret));
+ gnutls_certificate_free_credentials(x509_cred);
+ return NULL;
+ }
+ }
+
+ gnutls_certificate_set_dh_params (x509_cred, dh_params);
+
+ return x509_cred;
+}
+
static int start_auth_vencrypt_subauth(VncState *vs)
{
switch (vs->subauth) {
case VNC_AUTH_VENCRYPT_TLSNONE:
+ case VNC_AUTH_VENCRYPT_X509NONE:
VNC_DEBUG("Accept TLS auth none\n");
vnc_write_u32(vs, 0); /* Accept auth completion */
vnc_read_when(vs, protocol_client_init, 1);
break;
case VNC_AUTH_VENCRYPT_TLSVNC:
+ case VNC_AUTH_VENCRYPT_X509VNC:
VNC_DEBUG("Start TLS auth VNC\n");
return start_auth_vnc(vs);
@@ -1437,11 +1489,17 @@ static void vnc_handshake_io(void *opaque) {
vnc_continue_handshake(vs);
}
+#define NEED_X509_AUTH(vs) \
+ ((vs)->subauth == VNC_AUTH_VENCRYPT_X509NONE || \
+ (vs)->subauth == VNC_AUTH_VENCRYPT_X509VNC || \
+ (vs)->subauth == VNC_AUTH_VENCRYPT_X509PLAIN)
+
+
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};
- gnutls_anon_server_credentials anon_cred = NULL;
+ 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) {
@@ -1462,7 +1520,7 @@ static int vnc_start_tls(struct VncState *vs) {
return -1;
}
- if (gnutls_kx_set_priority(vs->tls_session, kx_anon) < 0) {
+ 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);
@@ -1483,19 +1541,36 @@ static int vnc_start_tls(struct VncState *vs) {
return -1;
}
- anon_cred = vnc_tls_initialize_anon_cred();
- if (!anon_cred) {
- gnutls_deinit(vs->tls_session);
- vs->tls_session = NULL;
- vnc_client_error(vs);
- return -1;
- }
- if (gnutls_credentials_set(vs->tls_session, GNUTLS_CRD_ANON, anon_cred) < 0) {
- gnutls_deinit(vs->tls_session);
- vs->tls_session = NULL;
- gnutls_anon_free_server_credentials(anon_cred);
- vnc_client_error(vs);
- return -1;
+ if (NEED_X509_AUTH(vs)) {
+ gnutls_certificate_server_credentials x509_cred = vnc_tls_initialize_x509_cred();
+ if (!x509_cred) {
+ gnutls_deinit(vs->tls_session);
+ vs->tls_session = NULL;
+ vnc_client_error(vs);
+ return -1;
+ }
+ if (gnutls_credentials_set(vs->tls_session, GNUTLS_CRD_CERTIFICATE, x509_cred) < 0) {
+ gnutls_deinit(vs->tls_session);
+ vs->tls_session = NULL;
+ gnutls_certificate_free_credentials(x509_cred);
+ vnc_client_error(vs);
+ return -1;
+ }
+ } else {
+ gnutls_anon_server_credentials anon_cred = vnc_tls_initialize_anon_cred();
+ if (!anon_cred) {
+ gnutls_deinit(vs->tls_session);
+ vs->tls_session = NULL;
+ vnc_client_error(vs);
+ return -1;
+ }
+ if (gnutls_credentials_set(vs->tls_session, GNUTLS_CRD_ANON, anon_cred) < 0) {
+ gnutls_deinit(vs->tls_session);
+ vs->tls_session = NULL;
+ gnutls_anon_free_server_credentials(anon_cred);
+ vnc_client_error(vs);
+ return -1;
+ }
}
gnutls_transport_set_ptr(vs->tls_session, (gnutls_transport_ptr_t)vs);
@@ -1797,7 +1872,7 @@ int vnc_display_open(DisplayState *ds, const char *display)
const char *options;
int password = 0;
#if CONFIG_VNC_TLS
- int tls = 0;
+ int tls = 0, x509 = 0;
#endif
vnc_display_close(ds);
@@ -1815,15 +1890,22 @@ int vnc_display_open(DisplayState *ds, const char *display)
#if CONFIG_VNC_TLS
else if (strncmp(options, "tls", 3) == 0)
tls = 1; /* Require TLS */
+ else if (strncmp(options, "x509", 4) == 0)
+ x509 = 1; /* Require x509 certificates */
#endif
}
if (password) {
#if CONFIG_VNC_TLS
if (tls) {
- VNC_DEBUG("Initializing VNC server with TLS password auth\n");
vs->auth = VNC_AUTH_VENCRYPT;
- vs->subauth = VNC_AUTH_VENCRYPT_TLSVNC;
+ if (x509) {
+ VNC_DEBUG("Initializing VNC server with x509 password auth\n");
+ vs->subauth = VNC_AUTH_VENCRYPT_X509VNC;
+ } else {
+ VNC_DEBUG("Initializing VNC server with TLS password auth\n");
+ vs->subauth = VNC_AUTH_VENCRYPT_TLSVNC;
+ }
} else {
#endif
VNC_DEBUG("Initializing VNC server with password auth\n");
@@ -1835,9 +1917,14 @@ int vnc_display_open(DisplayState *ds, const char *display)
} else {
#if CONFIG_VNC_TLS
if (tls) {
- VNC_DEBUG("Initializing VNC server with TLS no auth\n");
vs->auth = VNC_AUTH_VENCRYPT;
- vs->subauth = VNC_AUTH_VENCRYPT_TLSNONE;
+ if (x509) {
+ VNC_DEBUG("Initializing VNC server with x509 no auth\n");
+ vs->subauth = VNC_AUTH_VENCRYPT_X509NONE;
+ } else {
+ VNC_DEBUG("Initializing VNC server with TLS no auth\n");
+ vs->subauth = VNC_AUTH_VENCRYPT_TLSNONE;
+ }
} else {
#endif
VNC_DEBUG("Initializing VNC server with no auth\n");
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-18 08:33:08 +0000