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
  33 static 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
  66 static 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_HUP | G_IO_ERR | G_IO_OUT,
  83             vnc_client_io, vs, NULL);
  84         start_auth_vencrypt_subauth(vs);
  85     }
  86 }
  87
  88
  89 static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len)
  90 {
  91     int auth = read_u32(data, 0);
  92
  93     trace_vnc_auth_vencrypt_subauth(vs, auth);
  94     if (auth != vs->subauth) {
  95         trace_vnc_auth_fail(vs, vs->auth, "Unsupported sub-auth version", "");
  96         vnc_write_u8(vs, 0); /* Reject auth */
  97         vnc_flush(vs);
  98         vnc_client_error(vs);
  99     } else {
 100         Error *err = NULL;
 101         QIOChannelTLS *tls;
 102         vnc_write_u8(vs, 1); /* Accept auth */
 103         vnc_flush(vs);
 104
 105         if (vs->ioc_tag) {
 106             g_source_remove(vs->ioc_tag);
 107             vs->ioc_tag = 0;
 108         }
 109
 110         tls = qio_channel_tls_new_server(
 111             vs->ioc,
 112             vs->vd->tlscreds,
 113             vs->vd->tlsauthzid,
 114             &err);
 115         if (!tls) {
 116             trace_vnc_auth_fail(vs, vs->auth, "TLS setup failed",
 117                                 error_get_pretty(err));
 118             error_free(err);
 119             vnc_client_error(vs);
 120             return 0;
 121         }
 122
 123         qio_channel_set_name(QIO_CHANNEL(tls), "vnc-server-tls");
 124         object_unref(OBJECT(vs->ioc));
 125         vs->ioc = QIO_CHANNEL(tls);
 126         trace_vnc_client_io_wrap(vs, vs->ioc, "tls");
 127         vs->tls = qio_channel_tls_get_session(tls);
 128
 129         qio_channel_tls_handshake(tls,
 130                                   vnc_tls_handshake_done,
 131                                   vs,
 132                                   NULL,
 133                                   NULL);
 134     }
 135     return 0;
 136 }
 137
 138 static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len)
 139 {
 140     trace_vnc_auth_vencrypt_version(vs, (int)data[0], (int)data[1]);
 141     if (data[0] != 0 ||
 142         data[1] != 2) {
 143         trace_vnc_auth_fail(vs, vs->auth, "Unsupported version", "");
 144         vnc_write_u8(vs, 1); /* Reject version */
 145         vnc_flush(vs);
 146         vnc_client_error(vs);
 147     } else {
 148         vnc_write_u8(vs, 0); /* Accept version */
 149         vnc_write_u8(vs, 1); /* Number of sub-auths */
 150         vnc_write_u32(vs, vs->subauth); /* The supported auth */
 151         vnc_flush(vs);
 152         vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
 153     }
 154     return 0;
 155 }
 156
 157
 158 void start_auth_vencrypt(VncState *vs)
 159 {
 160     /* Send VeNCrypt version 0.2 */
 161     vnc_write_u8(vs, 0);
 162     vnc_write_u8(vs, 2);
 163
 164     vnc_read_when(vs, protocol_client_vencrypt_init, 2);
 165 }
 166