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