1 /* 2 * Copyright (C) 2015 Red Hat, Inc. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library. If not, see 16 * <http://www.gnu.org/licenses/>. 17 * 18 * Author: Daniel P. Berrange <berrange@redhat.com> 19 */ 20 21 #include "qemu/osdep.h" 22 23 #include "crypto-tls-x509-helpers.h" 24 #include "crypto/init.h" 25 #include "qemu/sockets.h" 26 27 /* 28 * This stores some static data that is needed when 29 * encoding extensions in the x509 certs 30 */ 31 asn1_node pkix_asn1; 32 33 /* 34 * To avoid consuming random entropy to generate keys, 35 * here's one we prepared earlier :-) 36 */ 37 gnutls_x509_privkey_t privkey; 38 # define PRIVATE_KEY \ 39 "-----BEGIN RSA PRIVATE KEY-----\n" \ 40 "MIIG5AIBAAKCAYEAyjWyLSNm5PZvYUKUcDWGqbLX10b2ood+YaFjWSnJrqx/q3qh\n" \ 41 "rVGBJglD25AJENJsmZF3zPP1oMhfIxsXu63Hdkb6Rdlc2RUoUP34x9VC1izH25mR\n" \ 42 "6c8DPDp1d6IraZ/llDMI1HsBFz0qGWtvOHgm815XG4PAr/N8rDsuqfv/cJ01KlnO\n" \ 43 "0OdO5QRXCJf9g/dYd41MPu7wOXk9FqjQlmRoP59HgtJ+zUpE4z+Keruw9cMT9VJj\n" \ 44 "0oT+pQ9ysenqeZ3gbT224T1khrEhT5kifhtFLNyDssRchUUWH0hiqoOO1vgb+850\n" \ 45 "W6/1VdxvuPam48py4diSPi1Vip8NITCOBaX9FIpVp4Ruw4rTPVMNMjq9Cpx/DwMP\n" \ 46 "9MbfXfnaVaZaMrmq67/zPhl0eVbUrecH2hQ3ZB9oIF4GkNskzlWF5+yPy6zqk304\n" \ 47 "AKaiFR6jRyh3YfHo2XFqV8x/hxdsIEXOtEUGhSIcpynsW+ckUCartzu7xbhXjd4b\n" \ 48 "kxJT89+riPFYij09AgMBAAECggGBAKyFkaZXXROeejrmHlV6JZGlp+fhgM38gkRz\n" \ 49 "+Jp7P7rLLAY3E7gXIPQ91WqAAmwazFNdvHPd9USfkCQYmnAi/VoZhrCPmlsQZRxt\n" \ 50 "A5QjjOnEvSPMa6SrXZxGWDCg6R8uMCb4P+FhrPWR1thnRDZOtRTQ+crc50p3mHgt\n" \ 51 "6ktXWIJRbqnag8zSfQqCYGtRmhe8sfsWT+Yl4El4+jjaAVU/B364u7+PLmaiphGp\n" \ 52 "BdJfTsTwEpgtGkPj+osDmhzXcZkfq3V+fz5JLkemsCiQKmn4VJRpg8c3ZmE8NPNt\n" \ 53 "gRtGWZ4W3WKDvhotT65WpQx4+6R8Duux/blNPBmH1Upmwd7kj7GYFBArbCjgd9PT\n" \ 54 "xgfCSUZpgOZHHkcgSB+022a8XncXna7WYYij28SLtwImFyu0nNtqECFQHH5u+k6C\n" \ 55 "LRYBSN+3t3At8dQuk01NVrJBndmjmXRfxpqUtTdeaNgVpdUYRY98s30G68NYGSra\n" \ 56 "aEvhhRSghkcLNetkobpY9pUgeqW/tQKBwQDZHHK9nDMt/zk1TxtILeUSitPXcv1/\n" \ 57 "8ufXqO0miHdH23XuXhIEA6Ef26RRVGDGgpjkveDJK/1w5feJ4H/ni4Vclil/cm38\n" \ 58 "OwRqjjd7ElHJX6JQbsxEx/gNTk5/QW1iAL9TXUalgepsSXYT6AJ0/CJv0jmJSJ36\n" \ 59 "YoKMOM8uqzb2KhN6i+RlJRi5iY53kUhWTJq5ArWvNhUzQNSYODI4bNxlsKSBL2Ik\n" \ 60 "LZ5QKHuaEjQet0IlPlfIb4PzMm8CHa/urOcCgcEA7m3zW/lL5bIFoKPjWig5Lbn1\n" \ 61 "aHfrG2ngqzWtgWtfZqMH8OkZc1Mdhhmvd46titjiLjeI+UP/uHXR0068PnrNngzl\n" \ 62 "tTgwlakzu+bWzqhBm1F+3/341st/FEk07r0P/3/PhezVjwfO8c8Exj7pLxH4wrH0\n" \ 63 "ROHgDbClmlJRu6OO78wk1+Vapf5DWa8YfA+q+fdvr7KvgGyytheKMT/b/dsqOq7y\n" \ 64 "qZPjmaJKWAvV3RWG8lWHFSdHx2IAHMHfGr17Y/w7AoHBALzwZeYebeekiVucGSjq\n" \ 65 "T8SgLhT7zCIx+JMUPjVfYzaUhP/Iu7Lkma6IzWm9nW6Drpy5pUpMzwUWDCLfzU9q\n" \ 66 "eseFIl337kEn9wLn+t5OpgAyCqYmlftxbqvdrrBN9uvnrJjWvqk/8wsDrw9JxAGc\n" \ 67 "fjeD4nBXUqvYWLXApoR9mZoGKedmoH9pFig4zlO9ig8YITnKYuQ0k6SD0b8agJHc\n" \ 68 "Ir0YSUDnRGgpjvFBGbeOCe+FGbohk/EpItJc3IAh5740lwKBwAdXd2DjokSmYKn7\n" \ 69 "oeqKxofz6+yVlLW5YuOiuX78sWlVp87xPolgi84vSEnkKM/Xsc8+goc6YstpRVa+\n" \ 70 "W+mImoA9YW1dF5HkLeWhTAf9AlgoAEIhbeIfTgBv6KNZSv7RDrDPBBxtXx/vAfSg\n" \ 71 "x0ldwk0scZsVYXLKd67yzfV7KdGUdaX4N/xYgfZm/9gCG3+q8NN2KxVHQ5F71BOE\n" \ 72 "JeABOaGo9WvnU+DNMIDZjHJMUWVw4MHz/a/UArDf/2CxaPVBNQKBwASg6j4ohSTk\n" \ 73 "J7aE6RQ3OBmmDDpixcoCJt9u9SjHVYMlbs5CEJGVSczk0SG3y8P1lOWNDSRnMksZ\n" \ 74 "xWnHdP/ogcuYMuvK7UACNAF0zNddtzOhzcpNmejFj+WCHYY/UmPr2/Kf6t7Cxk2K\n" \ 75 "3cZ4tqWsiTmBT8Bknmah7L5DrhS+ZBJliDeFAA8fZHdMH0Xjr4UBp9kF90EMTdW1\n" \ 76 "Xr5uz7ZrMsYpYQI7mmyqV9SSjUg4iBXwVSoag1iDJ1K8Qg/L7Semgg==\n" \ 77 "-----END RSA PRIVATE KEY-----\n" 78 79 /* 80 * This loads the private key we defined earlier 81 */ 82 static gnutls_x509_privkey_t test_tls_load_key(void) 83 { 84 gnutls_x509_privkey_t key; 85 const gnutls_datum_t data = { (unsigned char *)PRIVATE_KEY, 86 strlen(PRIVATE_KEY) }; 87 int err; 88 89 err = gnutls_x509_privkey_init(&key); 90 if (err < 0) { 91 g_critical("Failed to init key %s", gnutls_strerror(err)); 92 abort(); 93 } 94 95 err = gnutls_x509_privkey_import(key, &data, 96 GNUTLS_X509_FMT_PEM); 97 if (err < 0) { 98 if (err != GNUTLS_E_BASE64_UNEXPECTED_HEADER_ERROR && 99 err != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) { 100 g_critical("Failed to import key %s", gnutls_strerror(err)); 101 abort(); 102 } 103 104 err = gnutls_x509_privkey_import_pkcs8( 105 key, &data, GNUTLS_X509_FMT_PEM, NULL, 0); 106 if (err < 0) { 107 g_critical("Failed to import PKCS8 key %s", gnutls_strerror(err)); 108 abort(); 109 } 110 } 111 112 return key; 113 } 114 115 116 void test_tls_init(const char *keyfile) 117 { 118 qcrypto_init(&error_abort); 119 120 if (asn1_array2tree(pkix_asn1_tab, &pkix_asn1, NULL) != ASN1_SUCCESS) { 121 abort(); 122 } 123 124 privkey = test_tls_load_key(); 125 if (!g_file_set_contents(keyfile, PRIVATE_KEY, -1, NULL)) { 126 abort(); 127 } 128 } 129 130 131 void test_tls_cleanup(const char *keyfile) 132 { 133 asn1_delete_structure(&pkix_asn1); 134 unlink(keyfile); 135 } 136 137 /* 138 * Turns an ASN1 object into a DER encoded byte array 139 */ 140 static void test_tls_der_encode(asn1_node src, 141 const char *src_name, 142 gnutls_datum_t *res) 143 { 144 int size; 145 char *data = NULL; 146 147 size = 0; 148 asn1_der_coding(src, src_name, NULL, &size, NULL); 149 150 data = g_new0(char, size); 151 152 asn1_der_coding(src, src_name, data, &size, NULL); 153 154 res->data = (unsigned char *)data; 155 res->size = size; 156 } 157 158 159 static void 160 test_tls_get_ipaddr(const char *addrstr, 161 char **data, 162 int *datalen) 163 { 164 struct addrinfo *res; 165 struct addrinfo hints; 166 167 memset(&hints, 0, sizeof(hints)); 168 hints.ai_flags = AI_NUMERICHOST; 169 g_assert(getaddrinfo(addrstr, NULL, &hints, &res) == 0); 170 171 *datalen = res->ai_addrlen; 172 *data = g_new(char, *datalen); 173 memcpy(*data, res->ai_addr, *datalen); 174 freeaddrinfo(res); 175 } 176 177 /* 178 * This is a fairly lame x509 certificate generator. 179 * 180 * Do not copy/use this code for generating real certificates 181 * since it leaves out many things that you would want in 182 * certificates for real world usage. 183 * 184 * This is good enough only for doing tests of the QEMU 185 * TLS certificate code 186 */ 187 void 188 test_tls_generate_cert(QCryptoTLSTestCertReq *req, 189 gnutls_x509_crt_t ca) 190 { 191 gnutls_x509_crt_t crt; 192 int err; 193 static char buffer[1024 * 1024]; 194 size_t size = sizeof(buffer); 195 char serial[5] = { 1, 2, 3, 4, 0 }; 196 gnutls_datum_t der; 197 time_t start = time(NULL) + (60 * 60 * req->start_offset); 198 time_t expire = time(NULL) + (60 * 60 * (req->expire_offset 199 ? req->expire_offset : 24)); 200 201 /* 202 * Prepare our new certificate object 203 */ 204 err = gnutls_x509_crt_init(&crt); 205 if (err < 0) { 206 g_critical("Failed to initialize certificate %s", gnutls_strerror(err)); 207 abort(); 208 } 209 err = gnutls_x509_crt_set_key(crt, privkey); 210 if (err < 0) { 211 g_critical("Failed to set certificate key %s", gnutls_strerror(err)); 212 abort(); 213 } 214 215 /* 216 * A v3 certificate is required in order to be able 217 * set any of the basic constraints, key purpose and 218 * key usage data 219 */ 220 gnutls_x509_crt_set_version(crt, 3); 221 222 if (req->country) { 223 err = gnutls_x509_crt_set_dn_by_oid( 224 crt, GNUTLS_OID_X520_COUNTRY_NAME, 0, 225 req->country, strlen(req->country)); 226 if (err < 0) { 227 g_critical("Failed to set certificate country name %s", 228 gnutls_strerror(err)); 229 abort(); 230 } 231 } 232 if (req->cn) { 233 err = gnutls_x509_crt_set_dn_by_oid( 234 crt, GNUTLS_OID_X520_COMMON_NAME, 0, 235 req->cn, strlen(req->cn)); 236 if (err < 0) { 237 g_critical("Failed to set certificate common name %s", 238 gnutls_strerror(err)); 239 abort(); 240 } 241 } 242 243 /* 244 * Setup the subject altnames, which are used 245 * for hostname checks in live sessions 246 */ 247 if (req->altname1) { 248 err = gnutls_x509_crt_set_subject_alt_name( 249 crt, GNUTLS_SAN_DNSNAME, 250 req->altname1, 251 strlen(req->altname1), 252 GNUTLS_FSAN_APPEND); 253 if (err < 0) { 254 g_critical("Failed to set certificate alt name %s", 255 gnutls_strerror(err)); 256 abort(); 257 } 258 } 259 if (req->altname2) { 260 err = gnutls_x509_crt_set_subject_alt_name( 261 crt, GNUTLS_SAN_DNSNAME, 262 req->altname2, 263 strlen(req->altname2), 264 GNUTLS_FSAN_APPEND); 265 if (err < 0) { 266 g_critical("Failed to set certificate %s alt name", 267 gnutls_strerror(err)); 268 abort(); 269 } 270 } 271 272 /* 273 * IP address need to be put into the cert in their 274 * raw byte form, not strings, hence this is a little 275 * more complicated 276 */ 277 if (req->ipaddr1) { 278 char *data; 279 int len; 280 281 test_tls_get_ipaddr(req->ipaddr1, &data, &len); 282 283 err = gnutls_x509_crt_set_subject_alt_name( 284 crt, GNUTLS_SAN_IPADDRESS, 285 data, len, GNUTLS_FSAN_APPEND); 286 if (err < 0) { 287 g_critical("Failed to set certificate alt name %s", 288 gnutls_strerror(err)); 289 abort(); 290 } 291 g_free(data); 292 } 293 if (req->ipaddr2) { 294 char *data; 295 int len; 296 297 test_tls_get_ipaddr(req->ipaddr2, &data, &len); 298 299 err = gnutls_x509_crt_set_subject_alt_name( 300 crt, GNUTLS_SAN_IPADDRESS, 301 data, len, GNUTLS_FSAN_APPEND); 302 if (err < 0) { 303 g_critical("Failed to set certificate alt name %s", 304 gnutls_strerror(err)); 305 abort(); 306 } 307 g_free(data); 308 } 309 310 311 /* 312 * Basic constraints are used to decide if the cert 313 * is for a CA or not. We can't use the convenient 314 * gnutls API for setting this, since it hardcodes 315 * the 'critical' field which we want control over 316 */ 317 if (req->basicConstraintsEnable) { 318 asn1_node ext = NULL; 319 320 asn1_create_element(pkix_asn1, "PKIX1.BasicConstraints", &ext); 321 asn1_write_value(ext, "cA", 322 req->basicConstraintsIsCA ? "TRUE" : "FALSE", 1); 323 asn1_write_value(ext, "pathLenConstraint", NULL, 0); 324 test_tls_der_encode(ext, "", &der); 325 err = gnutls_x509_crt_set_extension_by_oid( 326 crt, "2.5.29.19", 327 der.data, der.size, 328 req->basicConstraintsCritical); 329 if (err < 0) { 330 g_critical("Failed to set certificate basic constraints %s", 331 gnutls_strerror(err)); 332 g_free(der.data); 333 abort(); 334 } 335 asn1_delete_structure(&ext); 336 g_free(der.data); 337 } 338 339 /* 340 * Next up the key usage extension. Again we can't 341 * use the gnutls API since it hardcodes the extension 342 * to be 'critical' 343 */ 344 if (req->keyUsageEnable) { 345 asn1_node ext = NULL; 346 char str[2]; 347 348 str[0] = req->keyUsageValue & 0xff; 349 str[1] = (req->keyUsageValue >> 8) & 0xff; 350 351 asn1_create_element(pkix_asn1, "PKIX1.KeyUsage", &ext); 352 asn1_write_value(ext, "", str, 9); 353 test_tls_der_encode(ext, "", &der); 354 err = gnutls_x509_crt_set_extension_by_oid( 355 crt, "2.5.29.15", 356 der.data, der.size, 357 req->keyUsageCritical); 358 if (err < 0) { 359 g_critical("Failed to set certificate key usage %s", 360 gnutls_strerror(err)); 361 g_free(der.data); 362 abort(); 363 } 364 asn1_delete_structure(&ext); 365 g_free(der.data); 366 } 367 368 /* 369 * Finally the key purpose extension. This time 370 * gnutls has the opposite problem, always hardcoding 371 * it to be non-critical. So once again we have to 372 * set this the hard way building up ASN1 data ourselves 373 */ 374 if (req->keyPurposeEnable) { 375 asn1_node ext = NULL; 376 377 asn1_create_element(pkix_asn1, "PKIX1.ExtKeyUsageSyntax", &ext); 378 if (req->keyPurposeOID1) { 379 asn1_write_value(ext, "", "NEW", 1); 380 asn1_write_value(ext, "?LAST", req->keyPurposeOID1, 1); 381 } 382 if (req->keyPurposeOID2) { 383 asn1_write_value(ext, "", "NEW", 1); 384 asn1_write_value(ext, "?LAST", req->keyPurposeOID2, 1); 385 } 386 test_tls_der_encode(ext, "", &der); 387 err = gnutls_x509_crt_set_extension_by_oid( 388 crt, "2.5.29.37", 389 der.data, der.size, 390 req->keyPurposeCritical); 391 if (err < 0) { 392 g_critical("Failed to set certificate key purpose %s", 393 gnutls_strerror(err)); 394 g_free(der.data); 395 abort(); 396 } 397 asn1_delete_structure(&ext); 398 g_free(der.data); 399 } 400 401 /* 402 * Any old serial number will do, so lets pick 5 403 */ 404 err = gnutls_x509_crt_set_serial(crt, serial, 5); 405 if (err < 0) { 406 g_critical("Failed to set certificate serial %s", 407 gnutls_strerror(err)); 408 abort(); 409 } 410 411 err = gnutls_x509_crt_set_activation_time(crt, start); 412 if (err < 0) { 413 g_critical("Failed to set certificate activation %s", 414 gnutls_strerror(err)); 415 abort(); 416 } 417 err = gnutls_x509_crt_set_expiration_time(crt, expire); 418 if (err < 0) { 419 g_critical("Failed to set certificate expiration %s", 420 gnutls_strerror(err)); 421 abort(); 422 } 423 424 425 /* 426 * If no 'ca' is set then we are self signing 427 * the cert. This is done for the root CA certs 428 */ 429 err = gnutls_x509_crt_sign2(crt, ca ? ca : crt, privkey, 430 GNUTLS_DIG_SHA256, 0); 431 if (err < 0) { 432 g_critical("Failed to sign certificate %s", 433 gnutls_strerror(err)); 434 abort(); 435 } 436 437 /* 438 * Finally write the new cert out to disk 439 */ 440 err = gnutls_x509_crt_export( 441 crt, GNUTLS_X509_FMT_PEM, buffer, &size); 442 if (err < 0) { 443 g_critical("Failed to export certificate %s: %d", 444 gnutls_strerror(err), err); 445 abort(); 446 } 447 448 if (!g_file_set_contents(req->filename, buffer, -1, NULL)) { 449 g_critical("Failed to write certificate %s", 450 req->filename); 451 abort(); 452 } 453 454 req->crt = crt; 455 } 456 457 458 void test_tls_write_cert_chain(const char *filename, 459 gnutls_x509_crt_t *certs, 460 size_t ncerts) 461 { 462 size_t i; 463 size_t capacity = 1024, offset = 0; 464 char *buffer = g_new0(char, capacity); 465 int err; 466 467 for (i = 0; i < ncerts; i++) { 468 size_t len = capacity - offset; 469 retry: 470 err = gnutls_x509_crt_export(certs[i], GNUTLS_X509_FMT_PEM, 471 buffer + offset, &len); 472 if (err < 0) { 473 if (err == GNUTLS_E_SHORT_MEMORY_BUFFER) { 474 buffer = g_renew(char, buffer, offset + len); 475 capacity = offset + len; 476 goto retry; 477 } 478 g_critical("Failed to export certificate chain %s: %d", 479 gnutls_strerror(err), err); 480 abort(); 481 } 482 offset += len; 483 } 484 485 if (!g_file_set_contents(filename, buffer, offset, NULL)) { 486 abort(); 487 } 488 g_free(buffer); 489 } 490 491 492 void test_tls_discard_cert(QCryptoTLSTestCertReq *req) 493 { 494 if (!req->crt) { 495 return; 496 } 497 498 gnutls_x509_crt_deinit(req->crt); 499 req->crt = NULL; 500 501 if (getenv("QEMU_TEST_DEBUG_CERTS") == NULL) { 502 unlink(req->filename); 503 } 504 } 505