LXR qemu/ui/vnc-auth-vencrypt.c

   1/*
   2 * QEMU VNC display driver: VeNCrypt authentication setup
   3 *
   4 * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
   5 * Copyright (C) 2006 Fabrice Bellard
   6 * Copyright (C) 2009 Red Hat, Inc
   7 *
   8 * Permission is hereby granted, free of charge, to any person obtaining a copy
   9 * of this software and associated documentation files (the "Software"), to deal
  10 * in the Software without restriction, including without limitation the rights
  11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 * copies of the Software, and to permit persons to whom the Software is
  13 * furnished to do so, subject to the following conditions:
  14 *
  15 * The above copyright notice and this permission notice shall be included in
  16 * all copies or substantial portions of the Software.
  17 *
  18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24 * THE SOFTWARE.
  25 */
  26
  27#include "qemu/osdep.h"
  28#include "vnc.h"
  29#include "qapi/error.h"
  30#include "qemu/main-loop.h"
  31
  32static void start_auth_vencrypt_subauth(VncState *vs)
  33{
  34    switch (vs->subauth) {
  35    case VNC_AUTH_VENCRYPT_TLSNONE:
  36    case VNC_AUTH_VENCRYPT_X509NONE:
  37       VNC_DEBUG("Accept TLS auth none\n");
  38       vnc_write_u32(vs, 0); /* Accept auth completion */
  39       start_client_init(vs);
  40       break;
  41
  42    case VNC_AUTH_VENCRYPT_TLSVNC:
  43    case VNC_AUTH_VENCRYPT_X509VNC:
  44       VNC_DEBUG("Start TLS auth VNC\n");
  45       start_auth_vnc(vs);
  46       break;
  47
  48#ifdef CONFIG_VNC_SASL
  49    case VNC_AUTH_VENCRYPT_TLSSASL:
  50    case VNC_AUTH_VENCRYPT_X509SASL:
  51      VNC_DEBUG("Start TLS auth SASL\n");
  52      start_auth_sasl(vs);
  53      break;
  54#endif /* CONFIG_VNC_SASL */
  55
  56    default: /* Should not be possible, but just in case */
  57       VNC_DEBUG("Reject subauth %d server bug\n", vs->auth);
  58       vnc_write_u8(vs, 1);
  59       if (vs->minor >= 8) {
  60           static const char err[] = "Unsupported authentication type";
  61           vnc_write_u32(vs, sizeof(err));
  62           vnc_write(vs, err, sizeof(err));
  63       }
  64       vnc_client_error(vs);
  65    }
  66}
  67
  68static void vnc_tls_handshake_done(QIOTask *task,
  69                                   gpointer user_data)
  70{
  71    VncState *vs = user_data;
  72    Error *err = NULL;
  73
  74    if (qio_task_propagate_error(task, &err)) {
  75        VNC_DEBUG("Handshake failed %s\n",
  76                  error_get_pretty(err));
  77        vnc_client_error(vs);
  78        error_free(err);
  79    } else {
  80        vs->ioc_tag = qio_channel_add_watch(
  81            vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL);
  82        start_auth_vencrypt_subauth(vs);
  83    }
  84}
  85
  86
  87static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len)
  88{
  89    int auth = read_u32(data, 0);
  90
  91    if (auth != vs->subauth) {
  92        VNC_DEBUG("Rejecting auth %d\n", auth);
  93        vnc_write_u8(vs, 0); /* Reject auth */
  94        vnc_flush(vs);
  95        vnc_client_error(vs);
  96    } else {
  97        Error *err = NULL;
  98        QIOChannelTLS *tls;
  99        VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth);
 100        vnc_write_u8(vs, 1); /* Accept auth */
 101        vnc_flush(vs);
 102
 103        if (vs->ioc_tag) {
 104            g_source_remove(vs->ioc_tag);
 105            vs->ioc_tag = 0;
 106        }
 107
 108        tls = qio_channel_tls_new_server(
 109            vs->ioc,
 110            vs->vd->tlscreds,
 111            vs->vd->tlsaclname,
 112            &err);
 113        if (!tls) {
 114            VNC_DEBUG("Failed to setup TLS %s\n", error_get_pretty(err));
 115            error_free(err);
 116            vnc_client_error(vs);
 117            return 0;
 118        }
 119
 120        qio_channel_set_name(QIO_CHANNEL(tls), "vnc-server-tls");
 121        VNC_DEBUG("Start TLS VeNCrypt handshake process\n");
 122        object_unref(OBJECT(vs->ioc));
 123        vs->ioc = QIO_CHANNEL(tls);
 124        vs->tls = qio_channel_tls_get_session(tls);
 125
 126        qio_channel_tls_handshake(tls,
 127                                  vnc_tls_handshake_done,
 128                                  vs,
 129                                  NULL);
 130    }
 131    return 0;
 132}
 133
 134static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len)
 135{
 136    if (data[0] != 0 ||
 137        data[1] != 2) {
 138        VNC_DEBUG("Unsupported VeNCrypt protocol %d.%d\n", (int)data[0], (int)data[1]);
 139        vnc_write_u8(vs, 1); /* Reject version */
 140        vnc_flush(vs);
 141        vnc_client_error(vs);
 142    } else {
 143        VNC_DEBUG("Sending allowed auth %d\n", vs->subauth);
 144        vnc_write_u8(vs, 0); /* Accept version */
 145        vnc_write_u8(vs, 1); /* Number of sub-auths */
 146        vnc_write_u32(vs, vs->subauth); /* The supported auth */
 147        vnc_flush(vs);
 148        vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
 149    }
 150    return 0;
 151}
 152
 153
 154void start_auth_vencrypt(VncState *vs)
 155{
 156    /* Send VeNCrypt version 0.2 */
 157    vnc_write_u8(vs, 0);
 158    vnc_write_u8(vs, 2);
 159
 160    vnc_read_when(vs, protocol_client_vencrypt_init, 2);
 161}
 162
 163