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Diffstat (limited to 'vnc-auth-vencrypt.c')
-rw-r--r--vnc-auth-vencrypt.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/vnc-auth-vencrypt.c b/vnc-auth-vencrypt.c
new file mode 100644
index 000000000..07c169186
--- /dev/null
+++ b/vnc-auth-vencrypt.c
@@ -0,0 +1,175 @@
+/*
+ * QEMU VNC display driver: VeNCrypt authentication setup
+ *
+ * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
+ * Copyright (C) 2006 Fabrice Bellard
+ * Copyright (C) 2009 Red Hat, Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "vnc.h"
+
+
+static void start_auth_vencrypt_subauth(VncState *vs)
+{
+ switch (vs->vd->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 */
+ start_client_init(vs);
+ break;
+
+ case VNC_AUTH_VENCRYPT_TLSVNC:
+ case VNC_AUTH_VENCRYPT_X509VNC:
+ VNC_DEBUG("Start TLS auth VNC\n");
+ start_auth_vnc(vs);
+ break;
+
+#ifdef CONFIG_VNC_SASL
+ case VNC_AUTH_VENCRYPT_TLSSASL:
+ case VNC_AUTH_VENCRYPT_X509SASL:
+ VNC_DEBUG("Start TLS auth SASL\n");
+ return start_auth_sasl(vs);
+#endif /* CONFIG_VNC_SASL */
+
+ default: /* Should not be possible, but just in case */
+ VNC_DEBUG("Reject subauth %d server bug\n", vs->vd->auth);
+ vnc_write_u8(vs, 1);
+ if (vs->minor >= 8) {
+ static const char err[] = "Unsupported authentication type";
+ vnc_write_u32(vs, sizeof(err));
+ vnc_write(vs, err, sizeof(err));
+ }
+ vnc_client_error(vs);
+ }
+}
+
+static void vnc_tls_handshake_io(void *opaque);
+
+static int vnc_start_vencrypt_handshake(struct VncState *vs) {
+ int ret;
+
+ if ((ret = gnutls_handshake(vs->tls.session)) < 0) {
+ if (!gnutls_error_is_fatal(ret)) {
+ VNC_DEBUG("Handshake interrupted (blocking)\n");
+ if (!gnutls_record_get_direction(vs->tls.session))
+ qemu_set_fd_handler(vs->csock, vnc_tls_handshake_io, NULL, vs);
+ else
+ qemu_set_fd_handler(vs->csock, NULL, vnc_tls_handshake_io, vs);
+ return 0;
+ }
+ VNC_DEBUG("Handshake failed %s\n", gnutls_strerror(ret));
+ vnc_client_error(vs);
+ return -1;
+ }
+
+ if (vs->vd->tls.x509verify) {
+ if (vnc_tls_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->tls.wiremode = VNC_WIREMODE_TLS;
+ qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, vnc_client_write, vs);
+
+ start_auth_vencrypt_subauth(vs);
+
+ return 0;
+}
+
+static void vnc_tls_handshake_io(void *opaque) {
+ struct VncState *vs = (struct VncState *)opaque;
+
+ VNC_DEBUG("Handshake IO continue\n");
+ vnc_start_vencrypt_handshake(vs);
+}
+
+
+
+#define NEED_X509_AUTH(vs) \
+ ((vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509NONE || \
+ (vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509VNC || \
+ (vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509PLAIN || \
+ (vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509SASL)
+
+
+static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len)
+{
+ int auth = read_u32(data, 0);
+
+ if (auth != vs->vd->subauth) {
+ VNC_DEBUG("Rejecting auth %d\n", auth);
+ vnc_write_u8(vs, 0); /* Reject auth */
+ vnc_flush(vs);
+ vnc_client_error(vs);
+ } else {
+ VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth);
+ vnc_write_u8(vs, 1); /* Accept auth */
+ vnc_flush(vs);
+
+ if (vnc_tls_client_setup(vs, NEED_X509_AUTH(vs)) < 0) {
+ VNC_DEBUG("Failed to setup TLS\n");
+ return 0;
+ }
+
+ VNC_DEBUG("Start TLS VeNCrypt handshake process\n");
+ if (vnc_start_vencrypt_handshake(vs) < 0) {
+ VNC_DEBUG("Failed to start TLS handshake\n");
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len)
+{
+ if (data[0] != 0 ||
+ data[1] != 2) {
+ VNC_DEBUG("Unsupported VeNCrypt protocol %d.%d\n", (int)data[0], (int)data[1]);
+ vnc_write_u8(vs, 1); /* Reject version */
+ vnc_flush(vs);
+ vnc_client_error(vs);
+ } else {
+ VNC_DEBUG("Sending allowed auth %d\n", vs->vd->subauth);
+ vnc_write_u8(vs, 0); /* Accept version */
+ vnc_write_u8(vs, 1); /* Number of sub-auths */
+ vnc_write_u32(vs, vs->vd->subauth); /* The supported auth */
+ vnc_flush(vs);
+ vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
+ }
+ return 0;
+}
+
+
+void start_auth_vencrypt(VncState *vs)
+{
+ /* Send VeNCrypt version 0.2 */
+ vnc_write_u8(vs, 0);
+ vnc_write_u8(vs, 2);
+
+ vnc_read_when(vs, protocol_client_vencrypt_init, 2);
+}
+