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authorths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>2007-08-25 01:39:10 +0000
committerths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>2007-08-25 01:39:10 +0000
commit469b15c68d0b9b00f5d2ab2a16ef5bcf46ca368f (patch)
tree0a6e48449397e71c01356edbc8a903287125c939 /vnc.c
parent3a702699b26ba5116c153457d552c577383a9fa1 (diff)
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x509 client certificate verification, by Daniel P. Berrange.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3138 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'vnc.c')
-rw-r--r--vnc.c106
1 files changed, 103 insertions, 3 deletions
diff --git a/vnc.c b/vnc.c
index 9012519..3508a84 100644
--- a/vnc.c
+++ b/vnc.c
@@ -142,6 +142,7 @@ struct VncState
int auth;
#if CONFIG_VNC_TLS
int subauth;
+ int x509verify;
#endif
char challenge[VNC_AUTH_CHALLENGE_SIZE];
@@ -1427,6 +1428,85 @@ static gnutls_certificate_credentials_t vnc_tls_initialize_x509_cred(void)
return x509_cred;
}
+static int vnc_validate_certificate(struct VncState *vs)
+{
+ int ret;
+ unsigned int status;
+ const gnutls_datum_t *certs;
+ unsigned int nCerts, i;
+ time_t now;
+
+ VNC_DEBUG("Validating client certificate\n");
+ if ((ret = gnutls_certificate_verify_peers2 (vs->tls_session, &status)) < 0) {
+ VNC_DEBUG("Verify failed %s\n", gnutls_strerror(ret));
+ return -1;
+ }
+
+ if ((now = time(NULL)) == ((time_t)-1)) {
+ return -1;
+ }
+
+ if (status != 0) {
+ if (status & GNUTLS_CERT_INVALID)
+ VNC_DEBUG("The certificate is not trusted.\n");
+
+ if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
+ VNC_DEBUG("The certificate hasn't got a known issuer.\n");
+
+ if (status & GNUTLS_CERT_REVOKED)
+ VNC_DEBUG("The certificate has been revoked.\n");
+
+ if (status & GNUTLS_CERT_INSECURE_ALGORITHM)
+ VNC_DEBUG("The certificate uses an insecure algorithm\n");
+
+ return -1;
+ } else {
+ VNC_DEBUG("Certificate is valid!\n");
+ }
+
+ /* Only support x509 for now */
+ if (gnutls_certificate_type_get(vs->tls_session) != GNUTLS_CRT_X509)
+ return -1;
+
+ if (!(certs = gnutls_certificate_get_peers(vs->tls_session, &nCerts)))
+ return -1;
+
+ for (i = 0 ; i < nCerts ; i++) {
+ gnutls_x509_crt_t cert;
+ VNC_DEBUG ("Checking certificate chain %d\n", i);
+ if (gnutls_x509_crt_init (&cert) < 0)
+ return -1;
+
+ if (gnutls_x509_crt_import(cert, &certs[i], GNUTLS_X509_FMT_DER) < 0) {
+ gnutls_x509_crt_deinit (cert);
+ return -1;
+ }
+
+ if (gnutls_x509_crt_get_expiration_time (cert) < now) {
+ VNC_DEBUG("The certificate has expired\n");
+ gnutls_x509_crt_deinit (cert);
+ return -1;
+ }
+
+ if (gnutls_x509_crt_get_activation_time (cert) > now) {
+ VNC_DEBUG("The certificate is not yet activated\n");
+ gnutls_x509_crt_deinit (cert);
+ return -1;
+ }
+
+ if (gnutls_x509_crt_get_activation_time (cert) > now) {
+ VNC_DEBUG("The certificate is not yet activated\n");
+ gnutls_x509_crt_deinit (cert);
+ return -1;
+ }
+
+ gnutls_x509_crt_deinit (cert);
+ }
+
+ return 0;
+}
+
+
static int start_auth_vencrypt_subauth(VncState *vs)
{
switch (vs->subauth) {
@@ -1475,6 +1555,16 @@ static int vnc_continue_handshake(struct VncState *vs) {
return -1;
}
+ if (vs->x509verify) {
+ if (vnc_validate_certificate(vs) < 0) {
+ VNC_DEBUG("Client verification failed\n");
+ vnc_client_error(vs);
+ return -1;
+ } else {
+ VNC_DEBUG("Client verification passed\n");
+ }
+ }
+
VNC_DEBUG("Handshake done, switching to TLS data mode\n");
vs->wiremode = VNC_WIREMODE_TLS;
qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, vnc_client_write, vs);
@@ -1556,6 +1646,11 @@ static int vnc_start_tls(struct VncState *vs) {
vnc_client_error(vs);
return -1;
}
+ if (vs->x509verify) {
+ VNC_DEBUG("Requesting a client certificate\n");
+ gnutls_certificate_server_set_request (vs->tls_session, GNUTLS_CERT_REQUEST);
+ }
+
} else {
gnutls_anon_server_credentials anon_cred = vnc_tls_initialize_anon_cred();
if (!anon_cred) {
@@ -1839,6 +1934,7 @@ void vnc_display_close(DisplayState *ds)
vs->auth = VNC_AUTH_INVALID;
#if CONFIG_VNC_TLS
vs->subauth = VNC_AUTH_INVALID;
+ vs->x509verify = 0;
#endif
}
@@ -1885,14 +1981,18 @@ int vnc_display_open(DisplayState *ds, const char *display)
options = display;
while ((options = strchr(options, ','))) {
options++;
- if (strncmp(options, "password", 8) == 0)
+ if (strncmp(options, "password", 8) == 0) {
password = 1; /* Require password auth */
#if CONFIG_VNC_TLS
- else if (strncmp(options, "tls", 3) == 0)
+ } else if (strncmp(options, "tls", 3) == 0) {
tls = 1; /* Require TLS */
- else if (strncmp(options, "x509", 4) == 0)
+ } else if (strncmp(options, "x509verify", 10) == 0) {
+ x509 = 1; /* Require x509 certificates... */
+ vs->x509verify = 1;/* ...and verify client certs */
+ } else if (strncmp(options, "x509", 4) == 0) {
x509 = 1; /* Require x509 certificates */
#endif
+ }
}
if (password) {