cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

vnc-auth-vencrypt.c (5346B)

      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_HUP | G_IO_ERR | G_IO_OUT,
     83            vnc_client_io, vs, NULL);
     84        start_auth_vencrypt_subauth(vs);
     85    }
     86}
     87
     88
     89static 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
    138static 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
    158void 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