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 "vnc.h" 28 #include "qemu/main-loop.h" 29 30 static void start_auth_vencrypt_subauth(VncState *vs) 31 { 32 switch (vs->subauth) { 33 case VNC_AUTH_VENCRYPT_TLSNONE: 34 case VNC_AUTH_VENCRYPT_X509NONE: 35 VNC_DEBUG("Accept TLS auth none\n"); 36 vnc_write_u32(vs, 0); /* Accept auth completion */ 37 start_client_init(vs); 38 break; 39 40 case VNC_AUTH_VENCRYPT_TLSVNC: 41 case VNC_AUTH_VENCRYPT_X509VNC: 42 VNC_DEBUG("Start TLS auth VNC\n"); 43 start_auth_vnc(vs); 44 break; 45 46 #ifdef CONFIG_VNC_SASL 47 case VNC_AUTH_VENCRYPT_TLSSASL: 48 case VNC_AUTH_VENCRYPT_X509SASL: 49 VNC_DEBUG("Start TLS auth SASL\n"); 50 start_auth_sasl(vs); 51 break; 52 #endif /* CONFIG_VNC_SASL */ 53 54 default: /* Should not be possible, but just in case */ 55 VNC_DEBUG("Reject subauth %d server bug\n", vs->auth); 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(Object *source, 67 Error *err, 68 gpointer user_data) 69 { 70 VncState *vs = user_data; 71 72 if (err) { 73 VNC_DEBUG("Handshake failed %s\n", 74 error_get_pretty(err)); 75 vnc_client_error(vs); 76 } else { 77 vs->ioc_tag = qio_channel_add_watch( 78 vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL); 79 start_auth_vencrypt_subauth(vs); 80 } 81 } 82 83 84 static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len) 85 { 86 int auth = read_u32(data, 0); 87 88 if (auth != vs->subauth) { 89 VNC_DEBUG("Rejecting auth %d\n", auth); 90 vnc_write_u8(vs, 0); /* Reject auth */ 91 vnc_flush(vs); 92 vnc_client_error(vs); 93 } else { 94 Error *err = NULL; 95 QIOChannelTLS *tls; 96 VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth); 97 vnc_write_u8(vs, 1); /* Accept auth */ 98 vnc_flush(vs); 99 100 if (vs->ioc_tag) { 101 g_source_remove(vs->ioc_tag); 102 vs->ioc_tag = 0; 103 } 104 105 tls = qio_channel_tls_new_server( 106 vs->ioc, 107 vs->vd->tlscreds, 108 vs->vd->tlsaclname, 109 &err); 110 if (!tls) { 111 VNC_DEBUG("Failed to setup TLS %s\n", error_get_pretty(err)); 112 error_free(err); 113 vnc_client_error(vs); 114 return 0; 115 } 116 117 VNC_DEBUG("Start TLS VeNCrypt handshake process\n"); 118 object_unref(OBJECT(vs->ioc)); 119 vs->ioc = QIO_CHANNEL(tls); 120 vs->tls = qio_channel_tls_get_session(tls); 121 122 qio_channel_tls_handshake(tls, 123 vnc_tls_handshake_done, 124 vs, 125 NULL); 126 } 127 return 0; 128 } 129 130 static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len) 131 { 132 if (data[0] != 0 || 133 data[1] != 2) { 134 VNC_DEBUG("Unsupported VeNCrypt protocol %d.%d\n", (int)data[0], (int)data[1]); 135 vnc_write_u8(vs, 1); /* Reject version */ 136 vnc_flush(vs); 137 vnc_client_error(vs); 138 } else { 139 VNC_DEBUG("Sending allowed auth %d\n", vs->subauth); 140 vnc_write_u8(vs, 0); /* Accept version */ 141 vnc_write_u8(vs, 1); /* Number of sub-auths */ 142 vnc_write_u32(vs, vs->subauth); /* The supported auth */ 143 vnc_flush(vs); 144 vnc_read_when(vs, protocol_client_vencrypt_auth, 4); 145 } 146 return 0; 147 } 148 149 150 void start_auth_vencrypt(VncState *vs) 151 { 152 /* Send VeNCrypt version 0.2 */ 153 vnc_write_u8(vs, 0); 154 vnc_write_u8(vs, 2); 155 156 vnc_read_when(vs, protocol_client_vencrypt_init, 2); 157 } 158 159