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 "qemu/main-loop.h" 30 31 static void start_auth_vencrypt_subauth(VncState *vs) 32 { 33 switch (vs->subauth) { 34 case VNC_AUTH_VENCRYPT_TLSNONE: 35 case VNC_AUTH_VENCRYPT_X509NONE: 36 VNC_DEBUG("Accept TLS auth none\n"); 37 vnc_write_u32(vs, 0); /* Accept auth completion */ 38 start_client_init(vs); 39 break; 40 41 case VNC_AUTH_VENCRYPT_TLSVNC: 42 case VNC_AUTH_VENCRYPT_X509VNC: 43 VNC_DEBUG("Start TLS auth VNC\n"); 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 VNC_DEBUG("Start TLS auth SASL\n"); 51 start_auth_sasl(vs); 52 break; 53 #endif /* CONFIG_VNC_SASL */ 54 55 default: /* Should not be possible, but just in case */ 56 VNC_DEBUG("Reject subauth %d server bug\n", vs->auth); 57 vnc_write_u8(vs, 1); 58 if (vs->minor >= 8) { 59 static const char err[] = "Unsupported authentication type"; 60 vnc_write_u32(vs, sizeof(err)); 61 vnc_write(vs, err, sizeof(err)); 62 } 63 vnc_client_error(vs); 64 } 65 } 66 67 static void vnc_tls_handshake_done(Object *source, 68 Error *err, 69 gpointer user_data) 70 { 71 VncState *vs = user_data; 72 73 if (err) { 74 VNC_DEBUG("Handshake failed %s\n", 75 error_get_pretty(err)); 76 vnc_client_error(vs); 77 } else { 78 vs->ioc_tag = qio_channel_add_watch( 79 vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL); 80 start_auth_vencrypt_subauth(vs); 81 } 82 } 83 84 85 static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len) 86 { 87 int auth = read_u32(data, 0); 88 89 if (auth != vs->subauth) { 90 VNC_DEBUG("Rejecting auth %d\n", auth); 91 vnc_write_u8(vs, 0); /* Reject auth */ 92 vnc_flush(vs); 93 vnc_client_error(vs); 94 } else { 95 Error *err = NULL; 96 QIOChannelTLS *tls; 97 VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth); 98 vnc_write_u8(vs, 1); /* Accept auth */ 99 vnc_flush(vs); 100 101 if (vs->ioc_tag) { 102 g_source_remove(vs->ioc_tag); 103 vs->ioc_tag = 0; 104 } 105 106 tls = qio_channel_tls_new_server( 107 vs->ioc, 108 vs->vd->tlscreds, 109 vs->vd->tlsaclname, 110 &err); 111 if (!tls) { 112 VNC_DEBUG("Failed to setup TLS %s\n", error_get_pretty(err)); 113 error_free(err); 114 vnc_client_error(vs); 115 return 0; 116 } 117 118 VNC_DEBUG("Start TLS VeNCrypt handshake process\n"); 119 object_unref(OBJECT(vs->ioc)); 120 vs->ioc = QIO_CHANNEL(tls); 121 vs->tls = qio_channel_tls_get_session(tls); 122 123 qio_channel_tls_handshake(tls, 124 vnc_tls_handshake_done, 125 vs, 126 NULL); 127 } 128 return 0; 129 } 130 131 static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len) 132 { 133 if (data[0] != 0 || 134 data[1] != 2) { 135 VNC_DEBUG("Unsupported VeNCrypt protocol %d.%d\n", (int)data[0], (int)data[1]); 136 vnc_write_u8(vs, 1); /* Reject version */ 137 vnc_flush(vs); 138 vnc_client_error(vs); 139 } else { 140 VNC_DEBUG("Sending allowed auth %d\n", vs->subauth); 141 vnc_write_u8(vs, 0); /* Accept version */ 142 vnc_write_u8(vs, 1); /* Number of sub-auths */ 143 vnc_write_u32(vs, vs->subauth); /* The supported auth */ 144 vnc_flush(vs); 145 vnc_read_when(vs, protocol_client_vencrypt_auth, 4); 146 } 147 return 0; 148 } 149 150 151 void start_auth_vencrypt(VncState *vs) 152 { 153 /* Send VeNCrypt version 0.2 */ 154 vnc_write_u8(vs, 0); 155 vnc_write_u8(vs, 2); 156 157 vnc_read_when(vs, protocol_client_vencrypt_init, 2); 158 } 159 160