1 /* 2 * QEMU TDX Quote Generation Support 3 * 4 * Copyright (c) 2025 Intel Corporation 5 * 6 * Author: 7 * Xiaoyao Li <xiaoyao.li@intel.com> 8 * 9 * SPDX-License-Identifier: GPL-2.0-or-later 10 */ 11 12 #include "qemu/osdep.h" 13 #include "qemu/error-report.h" 14 #include "qapi/error.h" 15 #include "qapi/qapi-visit-sockets.h" 16 17 #include "tdx-quote-generator.h" 18 19 #define QGS_MSG_LIB_MAJOR_VER 1 20 #define QGS_MSG_LIB_MINOR_VER 1 21 22 typedef enum _qgs_msg_type_t { 23 GET_QUOTE_REQ = 0, 24 GET_QUOTE_RESP = 1, 25 GET_COLLATERAL_REQ = 2, 26 GET_COLLATERAL_RESP = 3, 27 GET_PLATFORM_INFO_REQ = 4, 28 GET_PLATFORM_INFO_RESP = 5, 29 QGS_MSG_TYPE_MAX 30 } qgs_msg_type_t; 31 32 typedef struct _qgs_msg_header_t { 33 uint16_t major_version; 34 uint16_t minor_version; 35 uint32_t type; 36 uint32_t size; // size of the whole message, include this header, in byte 37 uint32_t error_code; // used in response only 38 } qgs_msg_header_t; 39 40 typedef struct _qgs_msg_get_quote_req_t { 41 qgs_msg_header_t header; // header.type = GET_QUOTE_REQ 42 uint32_t report_size; // cannot be 0 43 uint32_t id_list_size; // length of id_list, in byte, can be 0 44 } qgs_msg_get_quote_req_t; 45 46 typedef struct _qgs_msg_get_quote_resp_s { 47 qgs_msg_header_t header; // header.type = GET_QUOTE_RESP 48 uint32_t selected_id_size; // can be 0 in case only one id is sent in request 49 uint32_t quote_size; // length of quote_data, in byte 50 uint8_t id_quote[]; // selected id followed by quote 51 } qgs_msg_get_quote_resp_t; 52 53 #define HEADER_SIZE 4 54 55 static uint32_t decode_header(const char *buf, size_t len) { 56 if (len < HEADER_SIZE) { 57 return 0; 58 } 59 uint32_t msg_size = 0; 60 for (uint32_t i = 0; i < HEADER_SIZE; ++i) { 61 msg_size = msg_size * 256 + (buf[i] & 0xFF); 62 } 63 return msg_size; 64 } 65 66 static void encode_header(char *buf, size_t len, uint32_t size) { 67 assert(len >= HEADER_SIZE); 68 buf[0] = ((size >> 24) & 0xFF); 69 buf[1] = ((size >> 16) & 0xFF); 70 buf[2] = ((size >> 8) & 0xFF); 71 buf[3] = (size & 0xFF); 72 } 73 74 static void tdx_generate_quote_cleanup(TdxGenerateQuoteTask *task) 75 { 76 timer_del(&task->timer); 77 78 g_source_remove(task->watch); 79 qio_channel_close(QIO_CHANNEL(task->sioc), NULL); 80 object_unref(OBJECT(task->sioc)); 81 82 task->completion(task); 83 } 84 85 static gboolean tdx_get_quote_read(QIOChannel *ioc, GIOCondition condition, 86 gpointer opaque) 87 { 88 TdxGenerateQuoteTask *task = opaque; 89 Error *err = NULL; 90 int ret; 91 92 ret = qio_channel_read(ioc, task->receive_buf + task->receive_buf_received, 93 task->payload_len - task->receive_buf_received, &err); 94 if (ret < 0) { 95 if (ret == QIO_CHANNEL_ERR_BLOCK) { 96 return G_SOURCE_CONTINUE; 97 } else { 98 error_report_err(err); 99 task->status_code = TDX_VP_GET_QUOTE_ERROR; 100 goto end; 101 } 102 } 103 104 if (ret == 0) { 105 error_report("End of file before reply received"); 106 task->status_code = TDX_VP_GET_QUOTE_ERROR; 107 goto end; 108 } 109 110 task->receive_buf_received += ret; 111 if (task->receive_buf_received >= HEADER_SIZE) { 112 uint32_t len = decode_header(task->receive_buf, 113 task->receive_buf_received); 114 if (len == 0 || 115 len > (task->payload_len - HEADER_SIZE)) { 116 error_report("Message len %u must be non-zero & less than %zu", 117 len, (task->payload_len - HEADER_SIZE)); 118 task->status_code = TDX_VP_GET_QUOTE_ERROR; 119 goto end; 120 } 121 122 /* Now we know the size, shrink to fit */ 123 task->payload_len = HEADER_SIZE + len; 124 task->receive_buf = g_renew(char, 125 task->receive_buf, 126 task->payload_len); 127 } 128 129 if (task->receive_buf_received >= (sizeof(qgs_msg_header_t) + HEADER_SIZE)) { 130 qgs_msg_header_t *hdr = (qgs_msg_header_t *)(task->receive_buf + HEADER_SIZE); 131 if (hdr->major_version != QGS_MSG_LIB_MAJOR_VER || 132 hdr->minor_version != QGS_MSG_LIB_MINOR_VER) { 133 error_report("Invalid QGS message header version %d.%d", 134 hdr->major_version, 135 hdr->minor_version); 136 task->status_code = TDX_VP_GET_QUOTE_ERROR; 137 goto end; 138 } 139 if (hdr->type != GET_QUOTE_RESP) { 140 error_report("Invalid QGS message type %d", 141 hdr->type); 142 task->status_code = TDX_VP_GET_QUOTE_ERROR; 143 goto end; 144 } 145 if (hdr->size > (task->payload_len - HEADER_SIZE)) { 146 error_report("QGS message size %d exceeds payload capacity %zu", 147 hdr->size, task->payload_len); 148 task->status_code = TDX_VP_GET_QUOTE_ERROR; 149 goto end; 150 } 151 if (hdr->error_code != 0) { 152 error_report("QGS message error code %d", 153 hdr->error_code); 154 task->status_code = TDX_VP_GET_QUOTE_ERROR; 155 goto end; 156 } 157 } 158 if (task->receive_buf_received >= (sizeof(qgs_msg_get_quote_resp_t) + HEADER_SIZE)) { 159 qgs_msg_get_quote_resp_t *msg = (qgs_msg_get_quote_resp_t *)(task->receive_buf + HEADER_SIZE); 160 if (msg->selected_id_size != 0) { 161 error_report("QGS message selected ID was %d not 0", 162 msg->selected_id_size); 163 task->status_code = TDX_VP_GET_QUOTE_ERROR; 164 goto end; 165 } 166 167 if ((task->payload_len - HEADER_SIZE - sizeof(qgs_msg_get_quote_resp_t)) != 168 msg->quote_size) { 169 error_report("QGS quote size %d should be %zu", 170 msg->quote_size, 171 (task->payload_len - sizeof(qgs_msg_get_quote_resp_t))); 172 task->status_code = TDX_VP_GET_QUOTE_ERROR; 173 goto end; 174 } 175 } 176 177 if (task->receive_buf_received == task->payload_len) { 178 size_t strip = HEADER_SIZE + sizeof(qgs_msg_get_quote_resp_t); 179 memmove(task->receive_buf, 180 task->receive_buf + strip, 181 task->receive_buf_received - strip); 182 task->receive_buf_received -= strip; 183 task->status_code = TDX_VP_GET_QUOTE_SUCCESS; 184 goto end; 185 } 186 187 return G_SOURCE_CONTINUE; 188 189 end: 190 tdx_generate_quote_cleanup(task); 191 return G_SOURCE_REMOVE; 192 } 193 194 static gboolean tdx_send_report(QIOChannel *ioc, GIOCondition condition, 195 gpointer opaque) 196 { 197 TdxGenerateQuoteTask *task = opaque; 198 Error *err = NULL; 199 int ret; 200 201 ret = qio_channel_write(ioc, task->send_data + task->send_data_sent, 202 task->send_data_size - task->send_data_sent, &err); 203 if (ret < 0) { 204 if (ret == QIO_CHANNEL_ERR_BLOCK) { 205 ret = 0; 206 } else { 207 error_report_err(err); 208 task->status_code = TDX_VP_GET_QUOTE_ERROR; 209 tdx_generate_quote_cleanup(task); 210 goto end; 211 } 212 } 213 task->send_data_sent += ret; 214 215 if (task->send_data_sent == task->send_data_size) { 216 task->watch = qio_channel_add_watch(QIO_CHANNEL(task->sioc), G_IO_IN, 217 tdx_get_quote_read, task, NULL); 218 goto end; 219 } 220 221 return G_SOURCE_CONTINUE; 222 223 end: 224 return G_SOURCE_REMOVE; 225 } 226 227 static void tdx_quote_generator_connected(QIOTask *qio_task, gpointer opaque) 228 { 229 TdxGenerateQuoteTask *task = opaque; 230 Error *err = NULL; 231 int ret; 232 233 ret = qio_task_propagate_error(qio_task, &err); 234 if (ret) { 235 error_report_err(err); 236 task->status_code = TDX_VP_GET_QUOTE_QGS_UNAVAILABLE; 237 tdx_generate_quote_cleanup(task); 238 return; 239 } 240 241 task->watch = qio_channel_add_watch(QIO_CHANNEL(task->sioc), G_IO_OUT, 242 tdx_send_report, task, NULL); 243 } 244 245 #define TRANSACTION_TIMEOUT 30000 246 247 static void getquote_expired(void *opaque) 248 { 249 TdxGenerateQuoteTask *task = opaque; 250 251 task->status_code = TDX_VP_GET_QUOTE_ERROR; 252 tdx_generate_quote_cleanup(task); 253 } 254 255 static void setup_get_quote_timer(TdxGenerateQuoteTask *task) 256 { 257 int64_t time; 258 259 timer_init_ms(&task->timer, QEMU_CLOCK_VIRTUAL, getquote_expired, task); 260 time = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL); 261 timer_mod(&task->timer, time + TRANSACTION_TIMEOUT); 262 } 263 264 void tdx_generate_quote(TdxGenerateQuoteTask *task, 265 SocketAddress *qg_sock_addr) 266 { 267 QIOChannelSocket *sioc; 268 qgs_msg_get_quote_req_t msg; 269 270 /* Prepare a QGS message prelude */ 271 msg.header.major_version = QGS_MSG_LIB_MAJOR_VER; 272 msg.header.minor_version = QGS_MSG_LIB_MINOR_VER; 273 msg.header.type = GET_QUOTE_REQ; 274 msg.header.size = sizeof(msg) + task->send_data_size; 275 msg.header.error_code = 0; 276 msg.report_size = task->send_data_size; 277 msg.id_list_size = 0; 278 279 /* Make room to add the QGS message prelude */ 280 task->send_data = g_renew(char, 281 task->send_data, 282 task->send_data_size + sizeof(msg) + HEADER_SIZE); 283 memmove(task->send_data + sizeof(msg) + HEADER_SIZE, 284 task->send_data, 285 task->send_data_size); 286 memcpy(task->send_data + HEADER_SIZE, 287 &msg, 288 sizeof(msg)); 289 encode_header(task->send_data, HEADER_SIZE, task->send_data_size + sizeof(msg)); 290 task->send_data_size += sizeof(msg) + HEADER_SIZE; 291 292 sioc = qio_channel_socket_new(); 293 task->sioc = sioc; 294 295 setup_get_quote_timer(task); 296 297 qio_channel_socket_connect_async(sioc, qg_sock_addr, 298 tdx_quote_generator_connected, task, 299 NULL, NULL); 300 } 301