1 /* 2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include <stdio.h> 11 #include "internal/cryptlib.h" 12 #include <openssl/objects.h> 13 #include <openssl/ts.h> 14 #include <openssl/pkcs7.h> 15 #include "ts_lcl.h" 16 17 static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, 18 X509 *signer, STACK_OF(X509) **chain); 19 static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si, 20 STACK_OF(X509) *chain); 21 static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si); 22 static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert); 23 static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert); 24 static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx, 25 PKCS7 *token, TS_TST_INFO *tst_info); 26 static int ts_check_status_info(TS_RESP *response); 27 static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text); 28 static int ts_check_policy(const ASN1_OBJECT *req_oid, 29 const TS_TST_INFO *tst_info); 30 static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info, 31 X509_ALGOR **md_alg, 32 unsigned char **imprint, unsigned *imprint_len); 33 static int ts_check_imprints(X509_ALGOR *algor_a, 34 const unsigned char *imprint_a, unsigned len_a, 35 TS_TST_INFO *tst_info); 36 static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info); 37 static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer); 38 static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, 39 GENERAL_NAME *name); 40 static int ts_find_cert_v2(STACK_OF(ESS_CERT_ID_V2) *cert_ids, X509 *cert); 41 static ESS_SIGNING_CERT_V2 *ess_get_signing_cert_v2(PKCS7_SIGNER_INFO *si); 42 43 /* 44 * This must be large enough to hold all values in ts_status_text (with 45 * comma separator) or all text fields in ts_failure_info (also with comma). 46 */ 47 #define TS_STATUS_BUF_SIZE 256 48 49 /* 50 * Local mapping between response codes and descriptions. 51 */ 52 static const char *ts_status_text[] = { 53 "granted", 54 "grantedWithMods", 55 "rejection", 56 "waiting", 57 "revocationWarning", 58 "revocationNotification" 59 }; 60 61 #define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text) 62 63 static struct { 64 int code; 65 const char *text; 66 } ts_failure_info[] = { 67 {TS_INFO_BAD_ALG, "badAlg"}, 68 {TS_INFO_BAD_REQUEST, "badRequest"}, 69 {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"}, 70 {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"}, 71 {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"}, 72 {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"}, 73 {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"}, 74 {TS_INFO_SYSTEM_FAILURE, "systemFailure"} 75 }; 76 77 78 /*- 79 * This function carries out the following tasks: 80 * - Checks if there is one and only one signer. 81 * - Search for the signing certificate in 'certs' and in the response. 82 * - Check the extended key usage and key usage fields of the signer 83 * certificate (done by the path validation). 84 * - Build and validate the certificate path. 85 * - Check if the certificate path meets the requirements of the 86 * SigningCertificate ESS signed attribute. 87 * - Verify the signature value. 88 * - Returns the signer certificate in 'signer', if 'signer' is not NULL. 89 */ 90 int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs, 91 X509_STORE *store, X509 **signer_out) 92 { 93 STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL; 94 PKCS7_SIGNER_INFO *si; 95 STACK_OF(X509) *signers = NULL; 96 X509 *signer; 97 STACK_OF(X509) *chain = NULL; 98 char buf[4096]; 99 int i, j = 0, ret = 0; 100 BIO *p7bio = NULL; 101 102 /* Some sanity checks first. */ 103 if (!token) { 104 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER); 105 goto err; 106 } 107 if (!PKCS7_type_is_signed(token)) { 108 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE); 109 goto err; 110 } 111 sinfos = PKCS7_get_signer_info(token); 112 if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) { 113 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER); 114 goto err; 115 } 116 si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0); 117 if (PKCS7_get_detached(token)) { 118 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT); 119 goto err; 120 } 121 122 /* 123 * Get hold of the signer certificate, search only internal certificates 124 * if it was requested. 125 */ 126 signers = PKCS7_get0_signers(token, certs, 0); 127 if (!signers || sk_X509_num(signers) != 1) 128 goto err; 129 signer = sk_X509_value(signers, 0); 130 131 if (!ts_verify_cert(store, certs, signer, &chain)) 132 goto err; 133 if (!ts_check_signing_certs(si, chain)) 134 goto err; 135 p7bio = PKCS7_dataInit(token, NULL); 136 137 /* We now have to 'read' from p7bio to calculate digests etc. */ 138 while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0) 139 continue; 140 141 j = PKCS7_signatureVerify(p7bio, token, si, signer); 142 if (j <= 0) { 143 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE); 144 goto err; 145 } 146 147 if (signer_out) { 148 *signer_out = signer; 149 X509_up_ref(signer); 150 } 151 ret = 1; 152 153 err: 154 BIO_free_all(p7bio); 155 sk_X509_pop_free(chain, X509_free); 156 sk_X509_free(signers); 157 158 return ret; 159 } 160 161 /* 162 * The certificate chain is returned in chain. Caller is responsible for 163 * freeing the vector. 164 */ 165 static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, 166 X509 *signer, STACK_OF(X509) **chain) 167 { 168 X509_STORE_CTX *cert_ctx = NULL; 169 int i; 170 int ret = 0; 171 172 *chain = NULL; 173 cert_ctx = X509_STORE_CTX_new(); 174 if (cert_ctx == NULL) { 175 TSerr(TS_F_TS_VERIFY_CERT, ERR_R_MALLOC_FAILURE); 176 goto err; 177 } 178 if (!X509_STORE_CTX_init(cert_ctx, store, signer, untrusted)) 179 goto end; 180 X509_STORE_CTX_set_purpose(cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN); 181 i = X509_verify_cert(cert_ctx); 182 if (i <= 0) { 183 int j = X509_STORE_CTX_get_error(cert_ctx); 184 TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR); 185 ERR_add_error_data(2, "Verify error:", 186 X509_verify_cert_error_string(j)); 187 goto err; 188 } 189 *chain = X509_STORE_CTX_get1_chain(cert_ctx); 190 ret = 1; 191 goto end; 192 193 err: 194 ret = 0; 195 196 end: 197 X509_STORE_CTX_free(cert_ctx); 198 return ret; 199 } 200 201 static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si, 202 STACK_OF(X509) *chain) 203 { 204 ESS_SIGNING_CERT *ss = ess_get_signing_cert(si); 205 STACK_OF(ESS_CERT_ID) *cert_ids = NULL; 206 ESS_SIGNING_CERT_V2 *ssv2 = ess_get_signing_cert_v2(si); 207 STACK_OF(ESS_CERT_ID_V2) *cert_ids_v2 = NULL; 208 X509 *cert; 209 int i = 0; 210 int ret = 0; 211 212 if (ss != NULL) { 213 cert_ids = ss->cert_ids; 214 cert = sk_X509_value(chain, 0); 215 if (ts_find_cert(cert_ids, cert) != 0) 216 goto err; 217 218 /* 219 * Check the other certificates of the chain if there are more than one 220 * certificate ids in cert_ids. 221 */ 222 if (sk_ESS_CERT_ID_num(cert_ids) > 1) { 223 for (i = 1; i < sk_X509_num(chain); ++i) { 224 cert = sk_X509_value(chain, i); 225 if (ts_find_cert(cert_ids, cert) < 0) 226 goto err; 227 } 228 } 229 } else if (ssv2 != NULL) { 230 cert_ids_v2 = ssv2->cert_ids; 231 cert = sk_X509_value(chain, 0); 232 if (ts_find_cert_v2(cert_ids_v2, cert) != 0) 233 goto err; 234 235 /* 236 * Check the other certificates of the chain if there are more than one 237 * certificate ids in cert_ids. 238 */ 239 if (sk_ESS_CERT_ID_V2_num(cert_ids_v2) > 1) { 240 for (i = 1; i < sk_X509_num(chain); ++i) { 241 cert = sk_X509_value(chain, i); 242 if (ts_find_cert_v2(cert_ids_v2, cert) < 0) 243 goto err; 244 } 245 } 246 } else { 247 goto err; 248 } 249 250 ret = 1; 251 err: 252 if (!ret) 253 TSerr(TS_F_TS_CHECK_SIGNING_CERTS, 254 TS_R_ESS_SIGNING_CERTIFICATE_ERROR); 255 ESS_SIGNING_CERT_free(ss); 256 ESS_SIGNING_CERT_V2_free(ssv2); 257 return ret; 258 } 259 260 static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si) 261 { 262 ASN1_TYPE *attr; 263 const unsigned char *p; 264 attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate); 265 if (!attr) 266 return NULL; 267 p = attr->value.sequence->data; 268 return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length); 269 } 270 271 static ESS_SIGNING_CERT_V2 *ess_get_signing_cert_v2(PKCS7_SIGNER_INFO *si) 272 { 273 ASN1_TYPE *attr; 274 const unsigned char *p; 275 276 attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificateV2); 277 if (attr == NULL) 278 return NULL; 279 p = attr->value.sequence->data; 280 return d2i_ESS_SIGNING_CERT_V2(NULL, &p, attr->value.sequence->length); 281 } 282 283 /* Returns < 0 if certificate is not found, certificate index otherwise. */ 284 static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert) 285 { 286 int i; 287 unsigned char cert_sha1[SHA_DIGEST_LENGTH]; 288 289 if (!cert_ids || !cert) 290 return -1; 291 292 X509_digest(cert, EVP_sha1(), cert_sha1, NULL); 293 294 /* Recompute SHA1 hash of certificate if necessary (side effect). */ 295 X509_check_purpose(cert, -1, 0); 296 297 /* Look for cert in the cert_ids vector. */ 298 for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) { 299 ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i); 300 301 if (cid->hash->length == SHA_DIGEST_LENGTH 302 && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) { 303 ESS_ISSUER_SERIAL *is = cid->issuer_serial; 304 if (!is || !ts_issuer_serial_cmp(is, cert)) 305 return i; 306 } 307 } 308 309 return -1; 310 } 311 312 /* Returns < 0 if certificate is not found, certificate index otherwise. */ 313 static int ts_find_cert_v2(STACK_OF(ESS_CERT_ID_V2) *cert_ids, X509 *cert) 314 { 315 int i; 316 unsigned char cert_digest[EVP_MAX_MD_SIZE]; 317 unsigned int len; 318 319 /* Look for cert in the cert_ids vector. */ 320 for (i = 0; i < sk_ESS_CERT_ID_V2_num(cert_ids); ++i) { 321 ESS_CERT_ID_V2 *cid = sk_ESS_CERT_ID_V2_value(cert_ids, i); 322 const EVP_MD *md; 323 324 if (cid->hash_alg != NULL) 325 md = EVP_get_digestbyobj(cid->hash_alg->algorithm); 326 else 327 md = EVP_sha256(); 328 329 X509_digest(cert, md, cert_digest, &len); 330 if (cid->hash->length != (int)len) 331 return -1; 332 333 if (memcmp(cid->hash->data, cert_digest, cid->hash->length) == 0) { 334 ESS_ISSUER_SERIAL *is = cid->issuer_serial; 335 336 if (is == NULL || !ts_issuer_serial_cmp(is, cert)) 337 return i; 338 } 339 } 340 341 return -1; 342 } 343 344 static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert) 345 { 346 GENERAL_NAME *issuer; 347 348 if (!is || !cert || sk_GENERAL_NAME_num(is->issuer) != 1) 349 return -1; 350 351 issuer = sk_GENERAL_NAME_value(is->issuer, 0); 352 if (issuer->type != GEN_DIRNAME 353 || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert))) 354 return -1; 355 356 if (ASN1_INTEGER_cmp(is->serial, X509_get_serialNumber(cert))) 357 return -1; 358 359 return 0; 360 } 361 362 /*- 363 * Verifies whether 'response' contains a valid response with regards 364 * to the settings of the context: 365 * - Gives an error message if the TS_TST_INFO is not present. 366 * - Calls _TS_RESP_verify_token to verify the token content. 367 */ 368 int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response) 369 { 370 PKCS7 *token = response->token; 371 TS_TST_INFO *tst_info = response->tst_info; 372 int ret = 0; 373 374 if (!ts_check_status_info(response)) 375 goto err; 376 if (!int_ts_RESP_verify_token(ctx, token, tst_info)) 377 goto err; 378 ret = 1; 379 380 err: 381 return ret; 382 } 383 384 /* 385 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and 386 * calls the internal int_TS_RESP_verify_token function for verifying it. 387 */ 388 int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token) 389 { 390 TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token); 391 int ret = 0; 392 if (tst_info) { 393 ret = int_ts_RESP_verify_token(ctx, token, tst_info); 394 TS_TST_INFO_free(tst_info); 395 } 396 return ret; 397 } 398 399 /*- 400 * Verifies whether the 'token' contains a valid time stamp token 401 * with regards to the settings of the context. Only those checks are 402 * carried out that are specified in the context: 403 * - Verifies the signature of the TS_TST_INFO. 404 * - Checks the version number of the response. 405 * - Check if the requested and returned policies math. 406 * - Check if the message imprints are the same. 407 * - Check if the nonces are the same. 408 * - Check if the TSA name matches the signer. 409 * - Check if the TSA name is the expected TSA. 410 */ 411 static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx, 412 PKCS7 *token, TS_TST_INFO *tst_info) 413 { 414 X509 *signer = NULL; 415 GENERAL_NAME *tsa_name = tst_info->tsa; 416 X509_ALGOR *md_alg = NULL; 417 unsigned char *imprint = NULL; 418 unsigned imprint_len = 0; 419 int ret = 0; 420 int flags = ctx->flags; 421 422 /* Some options require us to also check the signature */ 423 if (((flags & TS_VFY_SIGNER) && tsa_name != NULL) 424 || (flags & TS_VFY_TSA_NAME)) { 425 flags |= TS_VFY_SIGNATURE; 426 } 427 428 if ((flags & TS_VFY_SIGNATURE) 429 && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer)) 430 goto err; 431 if ((flags & TS_VFY_VERSION) 432 && TS_TST_INFO_get_version(tst_info) != 1) { 433 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION); 434 goto err; 435 } 436 if ((flags & TS_VFY_POLICY) 437 && !ts_check_policy(ctx->policy, tst_info)) 438 goto err; 439 if ((flags & TS_VFY_IMPRINT) 440 && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len, 441 tst_info)) 442 goto err; 443 if ((flags & TS_VFY_DATA) 444 && (!ts_compute_imprint(ctx->data, tst_info, 445 &md_alg, &imprint, &imprint_len) 446 || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info))) 447 goto err; 448 if ((flags & TS_VFY_NONCE) 449 && !ts_check_nonces(ctx->nonce, tst_info)) 450 goto err; 451 if ((flags & TS_VFY_SIGNER) 452 && tsa_name && !ts_check_signer_name(tsa_name, signer)) { 453 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH); 454 goto err; 455 } 456 if ((flags & TS_VFY_TSA_NAME) 457 && !ts_check_signer_name(ctx->tsa_name, signer)) { 458 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED); 459 goto err; 460 } 461 ret = 1; 462 463 err: 464 X509_free(signer); 465 X509_ALGOR_free(md_alg); 466 OPENSSL_free(imprint); 467 return ret; 468 } 469 470 static int ts_check_status_info(TS_RESP *response) 471 { 472 TS_STATUS_INFO *info = response->status_info; 473 long status = ASN1_INTEGER_get(info->status); 474 const char *status_text = NULL; 475 char *embedded_status_text = NULL; 476 char failure_text[TS_STATUS_BUF_SIZE] = ""; 477 478 if (status == 0 || status == 1) 479 return 1; 480 481 /* There was an error, get the description in status_text. */ 482 if (0 <= status && status < (long) OSSL_NELEM(ts_status_text)) 483 status_text = ts_status_text[status]; 484 else 485 status_text = "unknown code"; 486 487 if (sk_ASN1_UTF8STRING_num(info->text) > 0 488 && (embedded_status_text = ts_get_status_text(info->text)) == NULL) 489 return 0; 490 491 /* Fill in failure_text with the failure information. */ 492 if (info->failure_info) { 493 int i; 494 int first = 1; 495 for (i = 0; i < (int)OSSL_NELEM(ts_failure_info); ++i) { 496 if (ASN1_BIT_STRING_get_bit(info->failure_info, 497 ts_failure_info[i].code)) { 498 if (!first) 499 strcat(failure_text, ","); 500 else 501 first = 0; 502 strcat(failure_text, ts_failure_info[i].text); 503 } 504 } 505 } 506 if (failure_text[0] == '\0') 507 strcpy(failure_text, "unspecified"); 508 509 TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN); 510 ERR_add_error_data(6, 511 "status code: ", status_text, 512 ", status text: ", embedded_status_text ? 513 embedded_status_text : "unspecified", 514 ", failure codes: ", failure_text); 515 OPENSSL_free(embedded_status_text); 516 517 return 0; 518 } 519 520 static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text) 521 { 522 int i; 523 int length = 0; 524 char *result = NULL; 525 char *p; 526 527 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) { 528 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); 529 if (ASN1_STRING_length(current) > TS_MAX_STATUS_LENGTH - length - 1) 530 return NULL; 531 length += ASN1_STRING_length(current); 532 length += 1; /* separator character */ 533 } 534 if ((result = OPENSSL_malloc(length)) == NULL) { 535 TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE); 536 return NULL; 537 } 538 539 for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) { 540 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); 541 length = ASN1_STRING_length(current); 542 if (i > 0) 543 *p++ = '/'; 544 strncpy(p, (const char *)ASN1_STRING_get0_data(current), length); 545 p += length; 546 } 547 *p = '\0'; 548 549 return result; 550 } 551 552 static int ts_check_policy(const ASN1_OBJECT *req_oid, 553 const TS_TST_INFO *tst_info) 554 { 555 const ASN1_OBJECT *resp_oid = tst_info->policy_id; 556 557 if (OBJ_cmp(req_oid, resp_oid) != 0) { 558 TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH); 559 return 0; 560 } 561 562 return 1; 563 } 564 565 static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info, 566 X509_ALGOR **md_alg, 567 unsigned char **imprint, unsigned *imprint_len) 568 { 569 TS_MSG_IMPRINT *msg_imprint = tst_info->msg_imprint; 570 X509_ALGOR *md_alg_resp = msg_imprint->hash_algo; 571 const EVP_MD *md; 572 EVP_MD_CTX *md_ctx = NULL; 573 unsigned char buffer[4096]; 574 int length; 575 576 *md_alg = NULL; 577 *imprint = NULL; 578 579 if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL) 580 goto err; 581 if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) { 582 TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM); 583 goto err; 584 } 585 length = EVP_MD_size(md); 586 if (length < 0) 587 goto err; 588 *imprint_len = length; 589 if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) { 590 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); 591 goto err; 592 } 593 594 md_ctx = EVP_MD_CTX_new(); 595 if (md_ctx == NULL) { 596 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); 597 goto err; 598 } 599 if (!EVP_DigestInit(md_ctx, md)) 600 goto err; 601 while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) { 602 if (!EVP_DigestUpdate(md_ctx, buffer, length)) 603 goto err; 604 } 605 if (!EVP_DigestFinal(md_ctx, *imprint, NULL)) 606 goto err; 607 EVP_MD_CTX_free(md_ctx); 608 609 return 1; 610 err: 611 EVP_MD_CTX_free(md_ctx); 612 X509_ALGOR_free(*md_alg); 613 OPENSSL_free(*imprint); 614 *imprint_len = 0; 615 *imprint = 0; 616 return 0; 617 } 618 619 static int ts_check_imprints(X509_ALGOR *algor_a, 620 const unsigned char *imprint_a, unsigned len_a, 621 TS_TST_INFO *tst_info) 622 { 623 TS_MSG_IMPRINT *b = tst_info->msg_imprint; 624 X509_ALGOR *algor_b = b->hash_algo; 625 int ret = 0; 626 627 if (algor_a) { 628 if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm)) 629 goto err; 630 631 /* The parameter must be NULL in both. */ 632 if ((algor_a->parameter 633 && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) 634 || (algor_b->parameter 635 && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL)) 636 goto err; 637 } 638 639 ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) && 640 memcmp(imprint_a, ASN1_STRING_get0_data(b->hashed_msg), len_a) == 0; 641 err: 642 if (!ret) 643 TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH); 644 return ret; 645 } 646 647 static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info) 648 { 649 const ASN1_INTEGER *b = tst_info->nonce; 650 651 if (!b) { 652 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED); 653 return 0; 654 } 655 656 /* No error if a nonce is returned without being requested. */ 657 if (ASN1_INTEGER_cmp(a, b) != 0) { 658 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH); 659 return 0; 660 } 661 662 return 1; 663 } 664 665 /* 666 * Check if the specified TSA name matches either the subject or one of the 667 * subject alternative names of the TSA certificate. 668 */ 669 static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer) 670 { 671 STACK_OF(GENERAL_NAME) *gen_names = NULL; 672 int idx = -1; 673 int found = 0; 674 675 if (tsa_name->type == GEN_DIRNAME 676 && X509_name_cmp(tsa_name->d.dirn, X509_get_subject_name(signer)) == 0) 677 return 1; 678 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); 679 while (gen_names != NULL) { 680 found = ts_find_name(gen_names, tsa_name) >= 0; 681 if (found) 682 break; 683 /* 684 * Get the next subject alternative name, although there should be no 685 * more than one. 686 */ 687 GENERAL_NAMES_free(gen_names); 688 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); 689 } 690 GENERAL_NAMES_free(gen_names); 691 692 return found; 693 } 694 695 /* Returns 1 if name is in gen_names, 0 otherwise. */ 696 static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name) 697 { 698 int i, found; 699 for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) { 700 GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i); 701 found = GENERAL_NAME_cmp(current, name) == 0; 702 } 703 return found ? i - 1 : -1; 704 } 705