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#include "trace.h"
  32
  33static void start_auth_vencrypt_subauth(VncState *vs)
  34{
  35    switch (vs->subauth) {
  36    case VNC_AUTH_VENCRYPT_TLSNONE:
  37    case VNC_AUTH_VENCRYPT_X509NONE:
  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       start_auth_vnc(vs);
  45       break;
  46
  47#ifdef CONFIG_VNC_SASL
  48    case VNC_AUTH_VENCRYPT_TLSSASL:
  49    case VNC_AUTH_VENCRYPT_X509SASL:
  50      start_auth_sasl(vs);
  51      break;
  52#endif /* CONFIG_VNC_SASL */
  53
  54    default: /* Should not be possible, but just in case */
  55       trace_vnc_auth_fail(vs, vs->auth, "Unhandled VeNCrypt subauth", "");
  56       vnc_write_u8(vs, 1);
  57       if (vs->minor >= 8) {
  58           static const char err[] = "Unsupported authentication type";
  59           vnc_write_u32(vs, sizeof(err));
  60           vnc_write(vs, err, sizeof(err));
  61       }
  62       vnc_client_error(vs);
  63    }
  64}
  65
  66static void vnc_tls_handshake_done(QIOTask *task,
  67                                   gpointer user_data)
  68{
  69    VncState *vs = user_data;
  70    Error *err = NULL;
  71
  72    if (qio_task_propagate_error(task, &err)) {
  73        trace_vnc_auth_fail(vs, vs->auth, "TLS handshake failed",
  74                            error_get_pretty(err));
  75        vnc_client_error(vs);
  76        error_free(err);
  77    } else {
  78        if (vs->ioc_tag) {
  79            g_source_remove(vs->ioc_tag);
  80        }
  81        vs->ioc_tag = qio_channel_add_watch(
  82            vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL);
  83        start_auth_vencrypt_subauth(vs);
  84    }
  85}
  86
  87
  88static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len)
  89{
  90    int auth = read_u32(data, 0);
  91
  92    trace_vnc_auth_vencrypt_subauth(vs, auth);
  93    if (auth != vs->subauth) {
  94        trace_vnc_auth_fail(vs, vs->auth, "Unsupported sub-auth version", "");
  95        vnc_write_u8(vs, 0); /* Reject auth */
  96        vnc_flush(vs);
  97        vnc_client_error(vs);
  98    } else {
  99        Error *err = NULL;
 100        QIOChannelTLS *tls;
 101        vnc_write_u8(vs, 1); /* Accept auth */
 102        vnc_flush(vs);
 103
 104        if (vs->ioc_tag) {
 105            g_source_remove(vs->ioc_tag);
 106            vs->ioc_tag = 0;
 107        }
 108
 109        tls = qio_channel_tls_new_server(
 110            vs->ioc,
 111            vs->vd->tlscreds,
 112            vs->vd->tlsauthzid,
 113            &err);
 114        if (!tls) {
 115            trace_vnc_auth_fail(vs, vs->auth, "TLS setup failed",
 116                                error_get_pretty(err));
 117            error_free(err);
 118            vnc_client_error(vs);
 119            return 0;
 120        }
 121
 122        qio_channel_set_name(QIO_CHANNEL(tls), "vnc-server-tls");
 123        object_unref(OBJECT(vs->ioc));
 124        vs->ioc = QIO_CHANNEL(tls);
 125        trace_vnc_client_io_wrap(vs, vs->ioc, "tls");
 126        vs->tls = qio_channel_tls_get_session(tls);
 127
 128        qio_channel_tls_handshake(tls,
 129                                  vnc_tls_handshake_done,
 130                                  vs,
 131                                  NULL,
 132                                  NULL);
 133    }
 134    return 0;
 135}
 136
 137static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len)
 138{
 139    trace_vnc_auth_vencrypt_version(vs, (int)data[0], (int)data[1]);
 140    if (data[0] != 0 ||
 141        data[1] != 2) {
 142        trace_vnc_auth_fail(vs, vs->auth, "Unsupported version", "");
 143        vnc_write_u8(vs, 1); /* Reject version */
 144        vnc_flush(vs);
 145        vnc_client_error(vs);
 146    } else {
 147        vnc_write_u8(vs, 0); /* Accept version */
 148        vnc_write_u8(vs, 1); /* Number of sub-auths */
 149        vnc_write_u32(vs, vs->subauth); /* The supported auth */
 150        vnc_flush(vs);
 151        vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
 152    }
 153    return 0;
 154}
 155
 156
 157void start_auth_vencrypt(VncState *vs)
 158{
 159    /* Send VeNCrypt version 0.2 */
 160    vnc_write_u8(vs, 0);
 161    vnc_write_u8(vs, 2);
 162
 163    vnc_read_when(vs, protocol_client_vencrypt_init, 2);
 164}
 165
 166