| 1 | /* |
| 2 | * X.509 certificate related helpers |
| 3 | * |
| 4 | * Copyright (c) 2024 Dorjoy Chowdhury <dorjoychy111@gmail.com> |
| 5 | * |
| 6 | * This work is licensed under the terms of the GNU GPL, version 2 or |
| 7 | * (at your option) any later version. See the COPYING file in the |
| 8 | * top-level directory. |
| 9 | */ |
| 10 | |
| 11 | #include "qemu/osdep.h" |
| 12 | #include "qapi/error.h" |
| 13 | #include "crypto/x509-utils.h" |
| 14 | |
| 15 | #ifdef CONFIG_GNUTLS |
| 16 | #include <gnutls/gnutls.h> |
| 17 | #include <gnutls/crypto.h> |
| 18 | #include <gnutls/x509.h> |
| 19 | #include <gnutls/pkcs7.h> |
| 20 | |
| 21 | static const int qcrypto_to_gnutls_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = { |
| 22 | [QCRYPTO_HASH_ALGO_MD5] = GNUTLS_DIG_MD5, |
| 23 | [QCRYPTO_HASH_ALGO_SHA1] = GNUTLS_DIG_SHA1, |
| 24 | [QCRYPTO_HASH_ALGO_SHA224] = GNUTLS_DIG_SHA224, |
| 25 | [QCRYPTO_HASH_ALGO_SHA256] = GNUTLS_DIG_SHA256, |
| 26 | [QCRYPTO_HASH_ALGO_SHA384] = GNUTLS_DIG_SHA384, |
| 27 | [QCRYPTO_HASH_ALGO_SHA512] = GNUTLS_DIG_SHA512, |
| 28 | [QCRYPTO_HASH_ALGO_RIPEMD160] = GNUTLS_DIG_RMD160, |
| 29 | }; |
| 30 | |
| 31 | static const int qcrypto_to_gnutls_keyid_flags_map[] = { |
| 32 | [QCRYPTO_HASH_ALGO_MD5] = -1, |
| 33 | [QCRYPTO_HASH_ALGO_SHA1] = GNUTLS_KEYID_USE_SHA1, |
| 34 | [QCRYPTO_HASH_ALGO_SHA224] = -1, |
| 35 | [QCRYPTO_HASH_ALGO_SHA256] = GNUTLS_KEYID_USE_SHA256, |
| 36 | [QCRYPTO_HASH_ALGO_SHA384] = -1, |
| 37 | [QCRYPTO_HASH_ALGO_SHA512] = GNUTLS_KEYID_USE_SHA512, |
| 38 | [QCRYPTO_HASH_ALGO_RIPEMD160] = -1, |
| 39 | }; |
| 40 | |
| 41 | int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size, |
| 42 | QCryptoHashAlgo alg, |
| 43 | uint8_t *result, |
| 44 | size_t *resultlen, |
| 45 | Error **errp) |
| 46 | { |
| 47 | int ret = -1; |
| 48 | int hlen; |
| 49 | gnutls_x509_crt_t crt; |
| 50 | gnutls_datum_t datum = {.data = cert, .size = size}; |
| 51 | |
| 52 | if (alg >= G_N_ELEMENTS(qcrypto_to_gnutls_hash_alg_map)) { |
| 53 | error_setg(errp, "Unknown hash algorithm"); |
| 54 | return -1; |
| 55 | } |
| 56 | |
| 57 | if (result == NULL) { |
| 58 | error_setg(errp, "No valid buffer given"); |
| 59 | return -1; |
| 60 | } |
| 61 | |
| 62 | ret = gnutls_x509_crt_init(&crt); |
| 63 | if (ret < 0) { |
| 64 | error_setg(errp, "Unable to initialize certificate: %s", |
| 65 | gnutls_strerror(ret)); |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | if (gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM) != 0) { |
| 70 | error_setg(errp, "Failed to import certificate"); |
| 71 | goto cleanup; |
| 72 | } |
| 73 | |
| 74 | hlen = gnutls_hash_get_len(qcrypto_to_gnutls_hash_alg_map[alg]); |
| 75 | if (*resultlen < hlen) { |
| 76 | error_setg(errp, |
| 77 | "Result buffer size %zu is smaller than hash %d", |
| 78 | *resultlen, hlen); |
| 79 | goto cleanup; |
| 80 | } |
| 81 | |
| 82 | if (gnutls_x509_crt_get_fingerprint(crt, |
| 83 | qcrypto_to_gnutls_hash_alg_map[alg], |
| 84 | result, resultlen) != 0) { |
| 85 | error_setg(errp, "Failed to get fingerprint from certificate"); |
| 86 | goto cleanup; |
| 87 | } |
| 88 | |
| 89 | ret = 0; |
| 90 | |
| 91 | cleanup: |
| 92 | gnutls_x509_crt_deinit(crt); |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | int qcrypto_x509_convert_cert_der(uint8_t *cert, size_t size, |
| 97 | uint8_t **result, size_t *resultlen, |
| 98 | Error **errp) |
| 99 | { |
| 100 | int ret = -1; |
| 101 | int rc; |
| 102 | gnutls_x509_crt_t crt; |
| 103 | gnutls_datum_t datum = {.data = cert, .size = size}; |
| 104 | gnutls_datum_t datum_der = {.data = NULL, .size = 0}; |
| 105 | |
| 106 | rc = gnutls_x509_crt_init(&crt); |
| 107 | if (rc < 0) { |
| 108 | error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); |
| 113 | if (rc != 0) { |
| 114 | error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); |
| 115 | goto cleanup; |
| 116 | } |
| 117 | |
| 118 | rc = gnutls_x509_crt_export2(crt, GNUTLS_X509_FMT_DER, &datum_der); |
| 119 | if (rc != 0) { |
| 120 | error_setg(errp, "Failed to convert certificate to DER format: %s", |
| 121 | gnutls_strerror(rc)); |
| 122 | goto cleanup; |
| 123 | } |
| 124 | |
| 125 | *resultlen = datum_der.size; |
| 126 | *result = g_memdup2(datum_der.data, datum_der.size); |
| 127 | |
| 128 | ret = 0; |
| 129 | |
| 130 | cleanup: |
| 131 | gnutls_x509_crt_deinit(crt); |
| 132 | g_free(datum_der.data); |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | int qcrypto_x509_check_cert_times(uint8_t *cert, size_t size, Error **errp) |
| 137 | { |
| 138 | int rc; |
| 139 | int ret = -1; |
| 140 | gnutls_x509_crt_t crt; |
| 141 | gnutls_datum_t datum = {.data = cert, .size = size}; |
| 142 | time_t now = time(NULL); |
| 143 | time_t exp_time; |
| 144 | time_t act_time; |
| 145 | |
| 146 | if (now == ((time_t)-1)) { |
| 147 | error_setg_errno(errp, errno, "Cannot get current time"); |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | rc = gnutls_x509_crt_init(&crt); |
| 152 | if (rc < 0) { |
| 153 | error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); |
| 158 | if (rc != 0) { |
| 159 | error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); |
| 160 | goto cleanup; |
| 161 | } |
| 162 | |
| 163 | exp_time = gnutls_x509_crt_get_expiration_time(crt); |
| 164 | if (exp_time == ((time_t)-1)) { |
| 165 | error_setg(errp, "Failed to get certificate expiration time"); |
| 166 | goto cleanup; |
| 167 | } |
| 168 | if (exp_time < now) { |
| 169 | error_setg(errp, "The certificate has expired"); |
| 170 | goto cleanup; |
| 171 | } |
| 172 | |
| 173 | act_time = gnutls_x509_crt_get_activation_time(crt); |
| 174 | if (act_time == ((time_t)-1)) { |
| 175 | error_setg(errp, "Failed to get certificate activation time"); |
| 176 | goto cleanup; |
| 177 | } |
| 178 | if (act_time > now) { |
| 179 | error_setg(errp, "The certificate is not yet active"); |
| 180 | goto cleanup; |
| 181 | } |
| 182 | |
| 183 | ret = 0; |
| 184 | |
| 185 | cleanup: |
| 186 | gnutls_x509_crt_deinit(crt); |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | static int qcrypto_x509_get_pk_algorithm(uint8_t *cert, size_t size, Error **errp) |
| 191 | { |
| 192 | int rc; |
| 193 | int ret = -1; |
| 194 | unsigned int bits; |
| 195 | gnutls_x509_crt_t crt; |
| 196 | gnutls_datum_t datum = {.data = cert, .size = size}; |
| 197 | |
| 198 | rc = gnutls_x509_crt_init(&crt); |
| 199 | if (rc < 0) { |
| 200 | error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); |
| 201 | return ret; |
| 202 | } |
| 203 | |
| 204 | rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); |
| 205 | if (rc != 0) { |
| 206 | error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); |
| 207 | goto cleanup; |
| 208 | } |
| 209 | |
| 210 | rc = gnutls_x509_crt_get_pk_algorithm(crt, &bits); |
| 211 | if (rc < 0) { |
| 212 | error_setg(errp, "Unknown public key algorithm %d", rc); |
| 213 | goto cleanup; |
| 214 | } |
| 215 | |
| 216 | ret = rc; |
| 217 | |
| 218 | cleanup: |
| 219 | gnutls_x509_crt_deinit(crt); |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | int qcrypto_x509_get_cert_key_id(uint8_t *cert, size_t size, |
| 224 | QCryptoHashAlgo hash_alg, |
| 225 | uint8_t **result, |
| 226 | size_t *resultlen, |
| 227 | Error **errp) |
| 228 | { |
| 229 | int rc; |
| 230 | int ret = -1; |
| 231 | gnutls_x509_crt_t crt; |
| 232 | gnutls_datum_t datum = {.data = cert, .size = size}; |
| 233 | |
| 234 | if (hash_alg >= G_N_ELEMENTS(qcrypto_to_gnutls_hash_alg_map)) { |
| 235 | error_setg(errp, "Unknown hash algorithm %d", hash_alg); |
| 236 | return ret; |
| 237 | } |
| 238 | |
| 239 | if (hash_alg >= G_N_ELEMENTS(qcrypto_to_gnutls_keyid_flags_map) || |
| 240 | qcrypto_to_gnutls_keyid_flags_map[hash_alg] == -1) { |
| 241 | error_setg(errp, "Unsupported key id flag %d", hash_alg); |
| 242 | return ret; |
| 243 | } |
| 244 | |
| 245 | rc = gnutls_x509_crt_init(&crt); |
| 246 | if (rc < 0) { |
| 247 | error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); |
| 248 | return ret; |
| 249 | } |
| 250 | |
| 251 | rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); |
| 252 | if (rc != 0) { |
| 253 | error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); |
| 254 | goto cleanup; |
| 255 | } |
| 256 | |
| 257 | *resultlen = gnutls_hash_get_len(qcrypto_to_gnutls_hash_alg_map[hash_alg]); |
| 258 | if (*resultlen == 0) { |
| 259 | error_setg(errp, "Failed to get hash algorithm length: %s", gnutls_strerror(rc)); |
| 260 | goto cleanup; |
| 261 | } |
| 262 | |
| 263 | *result = g_malloc0(*resultlen); |
| 264 | if (gnutls_x509_crt_get_key_id(crt, |
| 265 | qcrypto_to_gnutls_keyid_flags_map[hash_alg], |
| 266 | *result, resultlen) != 0) { |
| 267 | error_setg(errp, "Failed to get key ID from certificate"); |
| 268 | g_clear_pointer(result, g_free); |
| 269 | goto cleanup; |
| 270 | } |
| 271 | |
| 272 | ret = 0; |
| 273 | |
| 274 | cleanup: |
| 275 | gnutls_x509_crt_deinit(crt); |
| 276 | return ret; |
| 277 | } |
| 278 | |
| 279 | static int qcrypto_x509_get_ecc_curve(uint8_t *cert, size_t size, Error **errp) |
| 280 | { |
| 281 | int rc; |
| 282 | int ret = -1; |
| 283 | gnutls_x509_crt_t crt; |
| 284 | gnutls_datum_t datum = {.data = cert, .size = size}; |
| 285 | gnutls_ecc_curve_t curve_id; |
| 286 | gnutls_datum_t x = {.data = NULL, .size = 0}; |
| 287 | gnutls_datum_t y = {.data = NULL, .size = 0}; |
| 288 | |
| 289 | rc = gnutls_x509_crt_init(&crt); |
| 290 | if (rc < 0) { |
| 291 | error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); |
| 296 | if (rc != 0) { |
| 297 | error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); |
| 298 | goto cleanup; |
| 299 | } |
| 300 | |
| 301 | rc = gnutls_x509_crt_get_pk_ecc_raw(crt, &curve_id, &x, &y); |
| 302 | if (rc != 0) { |
| 303 | error_setg(errp, "Failed to get ECC public key curve: %s", gnutls_strerror(rc)); |
| 304 | goto cleanup; |
| 305 | } |
| 306 | |
| 307 | ret = curve_id; |
| 308 | |
| 309 | cleanup: |
| 310 | gnutls_x509_crt_deinit(crt); |
| 311 | g_free(x.data); |
| 312 | g_free(y.data); |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | int qcrypto_x509_check_ecc_curve_p521(uint8_t *cert, size_t size, Error **errp) |
| 317 | { |
| 318 | int algo; |
| 319 | int curve_id; |
| 320 | |
| 321 | algo = qcrypto_x509_get_pk_algorithm(cert, size, errp); |
| 322 | if (algo != GNUTLS_PK_ECDSA) { |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | curve_id = qcrypto_x509_get_ecc_curve(cert, size, errp); |
| 327 | if (curve_id == -1) { |
| 328 | error_setg(errp, "Failed to get ECC curve"); |
| 329 | return -1; |
| 330 | } |
| 331 | |
| 332 | if (curve_id == GNUTLS_ECC_CURVE_INVALID) { |
| 333 | error_setg(errp, "Invalid ECC curve"); |
| 334 | return -1; |
| 335 | } |
| 336 | |
| 337 | return curve_id == GNUTLS_ECC_CURVE_SECP521R1; |
| 338 | } |
| 339 | |
| 340 | int qcrypto_pkcs7_convert_sig_pem(uint8_t *sig, size_t sig_size, |
| 341 | uint8_t **result, size_t *resultlen, |
| 342 | Error **errp) |
| 343 | { |
| 344 | int ret = -1; |
| 345 | int rc; |
| 346 | gnutls_pkcs7_t signature; |
| 347 | gnutls_datum_t sig_datum_der = {.data = sig, .size = sig_size}; |
| 348 | gnutls_datum_t sig_datum_pem = {.data = NULL, .size = 0}; |
| 349 | |
| 350 | rc = gnutls_pkcs7_init(&signature); |
| 351 | if (rc < 0) { |
| 352 | error_setg(errp, "Failed to initialize pkcs7 data: %s", gnutls_strerror(rc)); |
| 353 | return ret; |
| 354 | } |
| 355 | |
| 356 | rc = gnutls_pkcs7_import(signature, &sig_datum_der, GNUTLS_X509_FMT_DER); |
| 357 | if (rc != 0) { |
| 358 | error_setg(errp, "Failed to import signature: %s", gnutls_strerror(rc)); |
| 359 | goto cleanup; |
| 360 | } |
| 361 | |
| 362 | rc = gnutls_pkcs7_export2(signature, GNUTLS_X509_FMT_PEM, &sig_datum_pem); |
| 363 | if (rc != 0) { |
| 364 | error_setg(errp, "Failed to convert signature to PEM format: %s", |
| 365 | gnutls_strerror(rc)); |
| 366 | goto cleanup; |
| 367 | } |
| 368 | |
| 369 | *resultlen = sig_datum_pem.size; |
| 370 | *result = g_memdup2(sig_datum_pem.data, sig_datum_pem.size); |
| 371 | |
| 372 | ret = 0; |
| 373 | |
| 374 | cleanup: |
| 375 | gnutls_pkcs7_deinit(signature); |
| 376 | g_free(sig_datum_pem.data); |
| 377 | return ret; |
| 378 | } |
| 379 | |
| 380 | int qcrypto_x509_verify_sig(uint8_t *cert, size_t cert_size, |
| 381 | uint8_t *comp, size_t comp_size, |
| 382 | uint8_t *sig, size_t sig_size, Error **errp) |
| 383 | { |
| 384 | int rc; |
| 385 | int ret = -1; |
| 386 | gnutls_x509_crt_t crt = NULL; |
| 387 | gnutls_pkcs7_t signature = NULL; |
| 388 | gnutls_datum_t cert_datum = {.data = cert, .size = cert_size}; |
| 389 | gnutls_datum_t data_datum = {.data = comp, .size = comp_size}; |
| 390 | gnutls_datum_t sig_datum = {.data = sig, .size = sig_size}; |
| 391 | |
| 392 | rc = gnutls_x509_crt_init(&crt); |
| 393 | if (rc < 0) { |
| 394 | error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); |
| 395 | goto cleanup; |
| 396 | } |
| 397 | |
| 398 | rc = gnutls_x509_crt_import(crt, &cert_datum, GNUTLS_X509_FMT_PEM); |
| 399 | if (rc != 0) { |
| 400 | error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); |
| 401 | goto cleanup; |
| 402 | } |
| 403 | |
| 404 | rc = gnutls_pkcs7_init(&signature); |
| 405 | if (rc < 0) { |
| 406 | error_setg(errp, "Failed to initialize pkcs7 data: %s", gnutls_strerror(rc)); |
| 407 | goto cleanup; |
| 408 | } |
| 409 | |
| 410 | rc = gnutls_pkcs7_import(signature, &sig_datum, GNUTLS_X509_FMT_PEM); |
| 411 | if (rc != 0) { |
| 412 | error_setg(errp, "Failed to import signature: %s", gnutls_strerror(rc)); |
| 413 | goto cleanup; |
| 414 | } |
| 415 | |
| 416 | rc = gnutls_pkcs7_verify_direct(signature, crt, 0, &data_datum, 0); |
| 417 | if (rc != 0) { |
| 418 | error_setg(errp, "Failed to verify signature: %s", gnutls_strerror(rc)); |
| 419 | goto cleanup; |
| 420 | } |
| 421 | |
| 422 | ret = 0; |
| 423 | |
| 424 | cleanup: |
| 425 | gnutls_x509_crt_deinit(crt); |
| 426 | gnutls_pkcs7_deinit(signature); |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | #else /* ! CONFIG_GNUTLS */ |
| 431 | |
| 432 | int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size, |
| 433 | QCryptoHashAlgo hash, |
| 434 | uint8_t *result, |
| 435 | size_t *resultlen, |
| 436 | Error **errp) |
| 437 | { |
| 438 | error_setg(errp, "GNUTLS is required to get fingerprint"); |
| 439 | return -1; |
| 440 | } |
| 441 | |
| 442 | int qcrypto_x509_convert_cert_der(uint8_t *cert, size_t size, |
| 443 | uint8_t **result, |
| 444 | size_t *resultlen, |
| 445 | Error **errp) |
| 446 | { |
| 447 | error_setg(errp, "GNUTLS is required to export X.509 certificate"); |
| 448 | return -1; |
| 449 | } |
| 450 | |
| 451 | int qcrypto_x509_check_cert_times(uint8_t *cert, size_t size, Error **errp) |
| 452 | { |
| 453 | error_setg(errp, "GNUTLS is required to get certificate times"); |
| 454 | return -1; |
| 455 | } |
| 456 | |
| 457 | int qcrypto_x509_get_cert_key_id(uint8_t *cert, size_t size, |
| 458 | QCryptoHashAlgo hash_alg, |
| 459 | uint8_t **result, |
| 460 | size_t *resultlen, |
| 461 | Error **errp) |
| 462 | { |
| 463 | error_setg(errp, "GNUTLS is required to get key ID"); |
| 464 | return -1; |
| 465 | } |
| 466 | |
| 467 | int qcrypto_x509_check_ecc_curve_p521(uint8_t *cert, size_t size, Error **errp) |
| 468 | { |
| 469 | error_setg(errp, "GNUTLS is required to determine ecc curve"); |
| 470 | return -1; |
| 471 | } |
| 472 | |
| 473 | int qcrypto_pkcs7_convert_sig_pem(uint8_t *sig, size_t sig_size, |
| 474 | uint8_t **result, |
| 475 | size_t *resultlen, |
| 476 | Error **errp) |
| 477 | { |
| 478 | error_setg(errp, "GNUTLS is required to export pkcs7 signature"); |
| 479 | return -1; |
| 480 | } |
| 481 | |
| 482 | int qcrypto_x509_verify_sig(uint8_t *cert, size_t cert_size, |
| 483 | uint8_t *comp, size_t comp_size, |
| 484 | uint8_t *sig, size_t sig_size, Error **errp) |
| 485 | { |
| 486 | error_setg(errp, "GNUTLS is required for signature-verification support"); |
| 487 | return -1; |
| 488 | } |
| 489 | |
| 490 | #endif /* ! CONFIG_GNUTLS */ |