1 /* 2 * Copyright 2006-2020 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 "e_os.h" 11 #include "internal/cryptlib.h" 12 13 #include <openssl/objects.h> 14 #include <openssl/ts.h> 15 #include <openssl/pkcs7.h> 16 #include <openssl/crypto.h> 17 #include "ts_local.h" 18 19 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *); 20 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec); 21 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *); 22 23 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx); 24 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx); 25 static int ts_RESP_check_request(TS_RESP_CTX *ctx); 26 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx); 27 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, 28 ASN1_OBJECT *policy); 29 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx); 30 static int ts_RESP_sign(TS_RESP_CTX *ctx); 31 32 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert, 33 STACK_OF(X509) *certs); 34 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed); 35 static int ts_TST_INFO_content_new(PKCS7 *p7); 36 static int ess_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc); 37 38 static ESS_SIGNING_CERT_V2 *ess_signing_cert_v2_new_init(const EVP_MD *hash_alg, 39 X509 *signcert, 40 STACK_OF(X509) 41 *certs); 42 static ESS_CERT_ID_V2 *ess_cert_id_v2_new_init(const EVP_MD *hash_alg, 43 X509 *cert, int issuer_needed); 44 static int ess_add_signing_cert_v2(PKCS7_SIGNER_INFO *si, 45 ESS_SIGNING_CERT_V2 *sc); 46 47 static ASN1_GENERALIZEDTIME 48 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long, 49 unsigned); 50 51 /* Default callback for response generation. */ 52 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data) 53 { 54 ASN1_INTEGER *serial = ASN1_INTEGER_new(); 55 56 if (serial == NULL) 57 goto err; 58 if (!ASN1_INTEGER_set(serial, 1)) 59 goto err; 60 61 return serial; 62 63 err: 64 TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE); 65 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 66 "Error during serial number generation."); 67 ASN1_INTEGER_free(serial); 68 return NULL; 69 } 70 71 #if defined(OPENSSL_SYS_UNIX) 72 73 static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 74 long *sec, long *usec) 75 { 76 struct timeval tv; 77 if (gettimeofday(&tv, NULL) != 0) { 78 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 79 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 80 "Time is not available."); 81 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 82 return 0; 83 } 84 *sec = tv.tv_sec; 85 *usec = tv.tv_usec; 86 87 return 1; 88 } 89 90 #else 91 92 static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 93 long *sec, long *usec) 94 { 95 time_t t; 96 if (time(&t) == (time_t)-1) { 97 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 98 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 99 "Time is not available."); 100 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 101 return 0; 102 } 103 *sec = (long)t; 104 *usec = 0; 105 106 return 1; 107 } 108 109 #endif 110 111 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, 112 void *data) 113 { 114 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 115 "Unsupported extension."); 116 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 117 return 0; 118 } 119 120 /* TS_RESP_CTX management functions. */ 121 122 TS_RESP_CTX *TS_RESP_CTX_new(void) 123 { 124 TS_RESP_CTX *ctx; 125 126 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) { 127 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE); 128 return NULL; 129 } 130 131 ctx->signer_md = EVP_sha256(); 132 133 ctx->serial_cb = def_serial_cb; 134 ctx->time_cb = def_time_cb; 135 ctx->extension_cb = def_extension_cb; 136 137 return ctx; 138 } 139 140 void TS_RESP_CTX_free(TS_RESP_CTX *ctx) 141 { 142 if (!ctx) 143 return; 144 145 X509_free(ctx->signer_cert); 146 EVP_PKEY_free(ctx->signer_key); 147 sk_X509_pop_free(ctx->certs, X509_free); 148 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 149 ASN1_OBJECT_free(ctx->default_policy); 150 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 151 ASN1_INTEGER_free(ctx->seconds); 152 ASN1_INTEGER_free(ctx->millis); 153 ASN1_INTEGER_free(ctx->micros); 154 OPENSSL_free(ctx); 155 } 156 157 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 158 { 159 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 160 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 161 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 162 return 0; 163 } 164 X509_free(ctx->signer_cert); 165 ctx->signer_cert = signer; 166 X509_up_ref(ctx->signer_cert); 167 return 1; 168 } 169 170 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 171 { 172 EVP_PKEY_free(ctx->signer_key); 173 ctx->signer_key = key; 174 EVP_PKEY_up_ref(ctx->signer_key); 175 176 return 1; 177 } 178 179 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md) 180 { 181 ctx->signer_md = md; 182 return 1; 183 } 184 185 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy) 186 { 187 ASN1_OBJECT_free(ctx->default_policy); 188 if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL) 189 goto err; 190 return 1; 191 err: 192 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE); 193 return 0; 194 } 195 196 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 197 { 198 199 sk_X509_pop_free(ctx->certs, X509_free); 200 ctx->certs = NULL; 201 if (!certs) 202 return 1; 203 if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) { 204 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE); 205 return 0; 206 } 207 208 return 1; 209 } 210 211 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy) 212 { 213 ASN1_OBJECT *copy = NULL; 214 215 if (ctx->policies == NULL 216 && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL) 217 goto err; 218 if ((copy = OBJ_dup(policy)) == NULL) 219 goto err; 220 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 221 goto err; 222 223 return 1; 224 err: 225 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE); 226 ASN1_OBJECT_free(copy); 227 return 0; 228 } 229 230 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 231 { 232 if (ctx->mds == NULL 233 && (ctx->mds = sk_EVP_MD_new_null()) == NULL) 234 goto err; 235 if (!sk_EVP_MD_push(ctx->mds, md)) 236 goto err; 237 238 return 1; 239 err: 240 TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE); 241 return 0; 242 } 243 244 #define TS_RESP_CTX_accuracy_free(ctx) \ 245 ASN1_INTEGER_free(ctx->seconds); \ 246 ctx->seconds = NULL; \ 247 ASN1_INTEGER_free(ctx->millis); \ 248 ctx->millis = NULL; \ 249 ASN1_INTEGER_free(ctx->micros); \ 250 ctx->micros = NULL; 251 252 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 253 int secs, int millis, int micros) 254 { 255 256 TS_RESP_CTX_accuracy_free(ctx); 257 if (secs 258 && ((ctx->seconds = ASN1_INTEGER_new()) == NULL 259 || !ASN1_INTEGER_set(ctx->seconds, secs))) 260 goto err; 261 if (millis 262 && ((ctx->millis = ASN1_INTEGER_new()) == NULL 263 || !ASN1_INTEGER_set(ctx->millis, millis))) 264 goto err; 265 if (micros 266 && ((ctx->micros = ASN1_INTEGER_new()) == NULL 267 || !ASN1_INTEGER_set(ctx->micros, micros))) 268 goto err; 269 270 return 1; 271 err: 272 TS_RESP_CTX_accuracy_free(ctx); 273 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE); 274 return 0; 275 } 276 277 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 278 { 279 ctx->flags |= flags; 280 } 281 282 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 283 { 284 ctx->serial_cb = cb; 285 ctx->serial_cb_data = data; 286 } 287 288 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data) 289 { 290 ctx->time_cb = cb; 291 ctx->time_cb_data = data; 292 } 293 294 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 295 TS_extension_cb cb, void *data) 296 { 297 ctx->extension_cb = cb; 298 ctx->extension_cb_data = data; 299 } 300 301 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 302 int status, const char *text) 303 { 304 TS_STATUS_INFO *si = NULL; 305 ASN1_UTF8STRING *utf8_text = NULL; 306 int ret = 0; 307 308 if ((si = TS_STATUS_INFO_new()) == NULL) 309 goto err; 310 if (!ASN1_INTEGER_set(si->status, status)) 311 goto err; 312 if (text) { 313 if ((utf8_text = ASN1_UTF8STRING_new()) == NULL 314 || !ASN1_STRING_set(utf8_text, text, strlen(text))) 315 goto err; 316 if (si->text == NULL 317 && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL) 318 goto err; 319 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 320 goto err; 321 utf8_text = NULL; /* Ownership is lost. */ 322 } 323 if (!TS_RESP_set_status_info(ctx->response, si)) 324 goto err; 325 ret = 1; 326 err: 327 if (!ret) 328 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE); 329 TS_STATUS_INFO_free(si); 330 ASN1_UTF8STRING_free(utf8_text); 331 return ret; 332 } 333 334 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 335 int status, const char *text) 336 { 337 int ret = 1; 338 TS_STATUS_INFO *si = ctx->response->status_info; 339 340 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 341 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 342 } 343 return ret; 344 } 345 346 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 347 { 348 TS_STATUS_INFO *si = ctx->response->status_info; 349 if (si->failure_info == NULL 350 && (si->failure_info = ASN1_BIT_STRING_new()) == NULL) 351 goto err; 352 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 353 goto err; 354 return 1; 355 err: 356 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE); 357 return 0; 358 } 359 360 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 361 { 362 return ctx->request; 363 } 364 365 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 366 { 367 return ctx->tst_info; 368 } 369 370 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, 371 unsigned precision) 372 { 373 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 374 return 0; 375 ctx->clock_precision_digits = precision; 376 return 1; 377 } 378 379 /* Main entry method of the response generation. */ 380 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 381 { 382 ASN1_OBJECT *policy; 383 TS_RESP *response; 384 int result = 0; 385 386 ts_RESP_CTX_init(ctx); 387 388 if ((ctx->response = TS_RESP_new()) == NULL) { 389 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE); 390 goto end; 391 } 392 if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) { 393 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 394 "Bad request format or system error."); 395 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 396 goto end; 397 } 398 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 399 goto end; 400 if (!ts_RESP_check_request(ctx)) 401 goto end; 402 if ((policy = ts_RESP_get_policy(ctx)) == NULL) 403 goto end; 404 if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL) 405 goto end; 406 if (!ts_RESP_process_extensions(ctx)) 407 goto end; 408 if (!ts_RESP_sign(ctx)) 409 goto end; 410 result = 1; 411 412 end: 413 if (!result) { 414 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR); 415 if (ctx->response != NULL) { 416 if (TS_RESP_CTX_set_status_info_cond(ctx, 417 TS_STATUS_REJECTION, 418 "Error during response " 419 "generation.") == 0) { 420 TS_RESP_free(ctx->response); 421 ctx->response = NULL; 422 } 423 } 424 } 425 response = ctx->response; 426 ctx->response = NULL; /* Ownership will be returned to caller. */ 427 ts_RESP_CTX_cleanup(ctx); 428 return response; 429 } 430 431 /* Initializes the variable part of the context. */ 432 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx) 433 { 434 ctx->request = NULL; 435 ctx->response = NULL; 436 ctx->tst_info = NULL; 437 } 438 439 /* Cleans up the variable part of the context. */ 440 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 441 { 442 TS_REQ_free(ctx->request); 443 ctx->request = NULL; 444 TS_RESP_free(ctx->response); 445 ctx->response = NULL; 446 TS_TST_INFO_free(ctx->tst_info); 447 ctx->tst_info = NULL; 448 } 449 450 /* Checks the format and content of the request. */ 451 static int ts_RESP_check_request(TS_RESP_CTX *ctx) 452 { 453 TS_REQ *request = ctx->request; 454 TS_MSG_IMPRINT *msg_imprint; 455 X509_ALGOR *md_alg; 456 int md_alg_id; 457 const ASN1_OCTET_STRING *digest; 458 const EVP_MD *md = NULL; 459 int i; 460 461 if (TS_REQ_get_version(request) != 1) { 462 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 463 "Bad request version."); 464 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 465 return 0; 466 } 467 468 msg_imprint = request->msg_imprint; 469 md_alg = msg_imprint->hash_algo; 470 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 471 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 472 const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 473 if (md_alg_id == EVP_MD_type(current_md)) 474 md = current_md; 475 } 476 if (!md) { 477 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 478 "Message digest algorithm is " 479 "not supported."); 480 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 481 return 0; 482 } 483 484 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 485 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 486 "Superfluous message digest " 487 "parameter."); 488 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 489 return 0; 490 } 491 digest = msg_imprint->hashed_msg; 492 if (digest->length != EVP_MD_size(md)) { 493 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 494 "Bad message digest."); 495 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 496 return 0; 497 } 498 499 return 1; 500 } 501 502 /* Returns the TSA policy based on the requested and acceptable policies. */ 503 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx) 504 { 505 ASN1_OBJECT *requested = ctx->request->policy_id; 506 ASN1_OBJECT *policy = NULL; 507 int i; 508 509 if (ctx->default_policy == NULL) { 510 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER); 511 return NULL; 512 } 513 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 514 policy = ctx->default_policy; 515 516 /* Check if the policy is acceptable. */ 517 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 518 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 519 if (!OBJ_cmp(requested, current)) 520 policy = current; 521 } 522 if (!policy) { 523 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY); 524 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 525 "Requested policy is not " "supported."); 526 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 527 } 528 return policy; 529 } 530 531 /* Creates the TS_TST_INFO object based on the settings of the context. */ 532 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, 533 ASN1_OBJECT *policy) 534 { 535 int result = 0; 536 TS_TST_INFO *tst_info = NULL; 537 ASN1_INTEGER *serial = NULL; 538 ASN1_GENERALIZEDTIME *asn1_time = NULL; 539 long sec, usec; 540 TS_ACCURACY *accuracy = NULL; 541 const ASN1_INTEGER *nonce; 542 GENERAL_NAME *tsa_name = NULL; 543 544 if ((tst_info = TS_TST_INFO_new()) == NULL) 545 goto end; 546 if (!TS_TST_INFO_set_version(tst_info, 1)) 547 goto end; 548 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 549 goto end; 550 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 551 goto end; 552 if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL 553 || !TS_TST_INFO_set_serial(tst_info, serial)) 554 goto end; 555 if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec) 556 || (asn1_time = 557 TS_RESP_set_genTime_with_precision(NULL, sec, usec, 558 ctx->clock_precision_digits)) == NULL 559 || !TS_TST_INFO_set_time(tst_info, asn1_time)) 560 goto end; 561 562 if ((ctx->seconds || ctx->millis || ctx->micros) 563 && (accuracy = TS_ACCURACY_new()) == NULL) 564 goto end; 565 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 566 goto end; 567 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 568 goto end; 569 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 570 goto end; 571 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 572 goto end; 573 574 if ((ctx->flags & TS_ORDERING) 575 && !TS_TST_INFO_set_ordering(tst_info, 1)) 576 goto end; 577 578 if ((nonce = ctx->request->nonce) != NULL 579 && !TS_TST_INFO_set_nonce(tst_info, nonce)) 580 goto end; 581 582 if (ctx->flags & TS_TSA_NAME) { 583 if ((tsa_name = GENERAL_NAME_new()) == NULL) 584 goto end; 585 tsa_name->type = GEN_DIRNAME; 586 tsa_name->d.dirn = 587 X509_NAME_dup(X509_get_subject_name(ctx->signer_cert)); 588 if (!tsa_name->d.dirn) 589 goto end; 590 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 591 goto end; 592 } 593 594 result = 1; 595 end: 596 if (!result) { 597 TS_TST_INFO_free(tst_info); 598 tst_info = NULL; 599 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR); 600 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 601 "Error during TSTInfo " 602 "generation."); 603 } 604 GENERAL_NAME_free(tsa_name); 605 TS_ACCURACY_free(accuracy); 606 ASN1_GENERALIZEDTIME_free(asn1_time); 607 ASN1_INTEGER_free(serial); 608 609 return tst_info; 610 } 611 612 /* Processing the extensions of the request. */ 613 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx) 614 { 615 STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions; 616 int i; 617 int ok = 1; 618 619 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 620 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 621 /* 622 * The last argument was previously (void *)ctx->extension_cb, 623 * but ISO C doesn't permit converting a function pointer to void *. 624 * For lack of better information, I'm placing a NULL there instead. 625 * The callback can pick its own address out from the ctx anyway... 626 */ 627 ok = (*ctx->extension_cb) (ctx, ext, NULL); 628 } 629 630 return ok; 631 } 632 633 /* Functions for signing the TS_TST_INFO structure of the context. */ 634 static int ts_RESP_sign(TS_RESP_CTX *ctx) 635 { 636 int ret = 0; 637 PKCS7 *p7 = NULL; 638 PKCS7_SIGNER_INFO *si; 639 STACK_OF(X509) *certs; /* Certificates to include in sc. */ 640 ESS_SIGNING_CERT_V2 *sc2 = NULL; 641 ESS_SIGNING_CERT *sc = NULL; 642 ASN1_OBJECT *oid; 643 BIO *p7bio = NULL; 644 int i; 645 646 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { 647 TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 648 goto err; 649 } 650 651 if ((p7 = PKCS7_new()) == NULL) { 652 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 653 goto err; 654 } 655 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 656 goto err; 657 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 658 goto err; 659 660 if (ctx->request->cert_req) { 661 PKCS7_add_certificate(p7, ctx->signer_cert); 662 if (ctx->certs) { 663 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 664 X509 *cert = sk_X509_value(ctx->certs, i); 665 PKCS7_add_certificate(p7, cert); 666 } 667 } 668 } 669 670 if ((si = PKCS7_add_signature(p7, ctx->signer_cert, 671 ctx->signer_key, ctx->signer_md)) == NULL) { 672 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR); 673 goto err; 674 } 675 676 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 677 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 678 V_ASN1_OBJECT, oid)) { 679 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 680 goto err; 681 } 682 683 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; 684 if (ctx->ess_cert_id_digest == NULL 685 || ctx->ess_cert_id_digest == EVP_sha1()) { 686 if ((sc = ess_SIGNING_CERT_new_init(ctx->signer_cert, certs)) == NULL) 687 goto err; 688 689 if (!ess_add_signing_cert(si, sc)) { 690 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR); 691 goto err; 692 } 693 } else { 694 sc2 = ess_signing_cert_v2_new_init(ctx->ess_cert_id_digest, 695 ctx->signer_cert, certs); 696 if (sc2 == NULL) 697 goto err; 698 699 if (!ess_add_signing_cert_v2(si, sc2)) { 700 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR); 701 goto err; 702 } 703 } 704 705 if (!ts_TST_INFO_content_new(p7)) 706 goto err; 707 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) { 708 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 709 goto err; 710 } 711 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { 712 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN); 713 goto err; 714 } 715 if (!PKCS7_dataFinal(p7, p7bio)) { 716 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN); 717 goto err; 718 } 719 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); 720 p7 = NULL; /* Ownership is lost. */ 721 ctx->tst_info = NULL; /* Ownership is lost. */ 722 723 ret = 1; 724 err: 725 if (!ret) 726 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 727 "Error during signature " 728 "generation."); 729 BIO_free_all(p7bio); 730 ESS_SIGNING_CERT_V2_free(sc2); 731 ESS_SIGNING_CERT_free(sc); 732 PKCS7_free(p7); 733 return ret; 734 } 735 736 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert, 737 STACK_OF(X509) *certs) 738 { 739 ESS_CERT_ID *cid; 740 ESS_SIGNING_CERT *sc = NULL; 741 int i; 742 743 if ((sc = ESS_SIGNING_CERT_new()) == NULL) 744 goto err; 745 if (sc->cert_ids == NULL 746 && (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL) 747 goto err; 748 749 if ((cid = ess_CERT_ID_new_init(signcert, 0)) == NULL 750 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 751 goto err; 752 for (i = 0; i < sk_X509_num(certs); ++i) { 753 X509 *cert = sk_X509_value(certs, i); 754 if ((cid = ess_CERT_ID_new_init(cert, 1)) == NULL 755 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 756 goto err; 757 } 758 759 return sc; 760 err: 761 ESS_SIGNING_CERT_free(sc); 762 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE); 763 return NULL; 764 } 765 766 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed) 767 { 768 ESS_CERT_ID *cid = NULL; 769 GENERAL_NAME *name = NULL; 770 unsigned char cert_sha1[SHA_DIGEST_LENGTH]; 771 772 /* Call for side-effect of computing hash and caching extensions */ 773 X509_check_purpose(cert, -1, 0); 774 if ((cid = ESS_CERT_ID_new()) == NULL) 775 goto err; 776 if (!X509_digest(cert, EVP_sha1(), cert_sha1, NULL)) 777 goto err; 778 if (!ASN1_OCTET_STRING_set(cid->hash, cert_sha1, SHA_DIGEST_LENGTH)) 779 goto err; 780 781 /* Setting the issuer/serial if requested. */ 782 if (issuer_needed) { 783 if (cid->issuer_serial == NULL 784 && (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL) 785 goto err; 786 if ((name = GENERAL_NAME_new()) == NULL) 787 goto err; 788 name->type = GEN_DIRNAME; 789 if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL) 790 goto err; 791 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 792 goto err; 793 name = NULL; /* Ownership is lost. */ 794 ASN1_INTEGER_free(cid->issuer_serial->serial); 795 if (!(cid->issuer_serial->serial = 796 ASN1_INTEGER_dup(X509_get_serialNumber(cert)))) 797 goto err; 798 } 799 800 return cid; 801 err: 802 GENERAL_NAME_free(name); 803 ESS_CERT_ID_free(cid); 804 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE); 805 return NULL; 806 } 807 808 static int ts_TST_INFO_content_new(PKCS7 *p7) 809 { 810 PKCS7 *ret = NULL; 811 ASN1_OCTET_STRING *octet_string = NULL; 812 813 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 814 if ((ret = PKCS7_new()) == NULL) 815 goto err; 816 if ((ret->d.other = ASN1_TYPE_new()) == NULL) 817 goto err; 818 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 819 if ((octet_string = ASN1_OCTET_STRING_new()) == NULL) 820 goto err; 821 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 822 octet_string = NULL; 823 824 /* Add encapsulated content to signed PKCS7 structure. */ 825 if (!PKCS7_set_content(p7, ret)) 826 goto err; 827 828 return 1; 829 err: 830 ASN1_OCTET_STRING_free(octet_string); 831 PKCS7_free(ret); 832 return 0; 833 } 834 835 static int ess_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 836 { 837 ASN1_STRING *seq = NULL; 838 unsigned char *p, *pp = NULL; 839 int len; 840 841 len = i2d_ESS_SIGNING_CERT(sc, NULL); 842 if ((pp = OPENSSL_malloc(len)) == NULL) { 843 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 844 goto err; 845 } 846 p = pp; 847 i2d_ESS_SIGNING_CERT(sc, &p); 848 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { 849 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 850 goto err; 851 } 852 OPENSSL_free(pp); 853 pp = NULL; 854 return PKCS7_add_signed_attribute(si, 855 NID_id_smime_aa_signingCertificate, 856 V_ASN1_SEQUENCE, seq); 857 err: 858 ASN1_STRING_free(seq); 859 OPENSSL_free(pp); 860 861 return 0; 862 } 863 864 static ESS_SIGNING_CERT_V2 *ess_signing_cert_v2_new_init(const EVP_MD *hash_alg, 865 X509 *signcert, 866 STACK_OF(X509) *certs) 867 { 868 ESS_CERT_ID_V2 *cid = NULL; 869 ESS_SIGNING_CERT_V2 *sc = NULL; 870 int i; 871 872 if ((sc = ESS_SIGNING_CERT_V2_new()) == NULL) 873 goto err; 874 if ((cid = ess_cert_id_v2_new_init(hash_alg, signcert, 0)) == NULL) 875 goto err; 876 if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid)) 877 goto err; 878 cid = NULL; 879 880 for (i = 0; i < sk_X509_num(certs); ++i) { 881 X509 *cert = sk_X509_value(certs, i); 882 883 if ((cid = ess_cert_id_v2_new_init(hash_alg, cert, 1)) == NULL) 884 goto err; 885 if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid)) 886 goto err; 887 cid = NULL; 888 } 889 890 return sc; 891 err: 892 ESS_SIGNING_CERT_V2_free(sc); 893 ESS_CERT_ID_V2_free(cid); 894 TSerr(TS_F_ESS_SIGNING_CERT_V2_NEW_INIT, ERR_R_MALLOC_FAILURE); 895 return NULL; 896 } 897 898 static ESS_CERT_ID_V2 *ess_cert_id_v2_new_init(const EVP_MD *hash_alg, 899 X509 *cert, int issuer_needed) 900 { 901 ESS_CERT_ID_V2 *cid = NULL; 902 GENERAL_NAME *name = NULL; 903 unsigned char hash[EVP_MAX_MD_SIZE]; 904 unsigned int hash_len = sizeof(hash); 905 X509_ALGOR *alg = NULL; 906 907 memset(hash, 0, sizeof(hash)); 908 909 if ((cid = ESS_CERT_ID_V2_new()) == NULL) 910 goto err; 911 912 if (hash_alg != EVP_sha256()) { 913 alg = X509_ALGOR_new(); 914 if (alg == NULL) 915 goto err; 916 X509_ALGOR_set_md(alg, hash_alg); 917 if (alg->algorithm == NULL) 918 goto err; 919 cid->hash_alg = alg; 920 alg = NULL; 921 } else { 922 cid->hash_alg = NULL; 923 } 924 925 if (!X509_digest(cert, hash_alg, hash, &hash_len)) 926 goto err; 927 928 if (!ASN1_OCTET_STRING_set(cid->hash, hash, hash_len)) 929 goto err; 930 931 if (issuer_needed) { 932 if ((cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL) 933 goto err; 934 if ((name = GENERAL_NAME_new()) == NULL) 935 goto err; 936 name->type = GEN_DIRNAME; 937 if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL) 938 goto err; 939 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 940 goto err; 941 name = NULL; /* Ownership is lost. */ 942 ASN1_INTEGER_free(cid->issuer_serial->serial); 943 cid->issuer_serial->serial = 944 ASN1_INTEGER_dup(X509_get_serialNumber(cert)); 945 if (cid->issuer_serial->serial == NULL) 946 goto err; 947 } 948 949 return cid; 950 err: 951 X509_ALGOR_free(alg); 952 GENERAL_NAME_free(name); 953 ESS_CERT_ID_V2_free(cid); 954 TSerr(TS_F_ESS_CERT_ID_V2_NEW_INIT, ERR_R_MALLOC_FAILURE); 955 return NULL; 956 } 957 958 static int ess_add_signing_cert_v2(PKCS7_SIGNER_INFO *si, 959 ESS_SIGNING_CERT_V2 *sc) 960 { 961 ASN1_STRING *seq = NULL; 962 unsigned char *p, *pp = NULL; 963 int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL); 964 965 if ((pp = OPENSSL_malloc(len)) == NULL) { 966 TSerr(TS_F_ESS_ADD_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE); 967 goto err; 968 } 969 970 p = pp; 971 i2d_ESS_SIGNING_CERT_V2(sc, &p); 972 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { 973 TSerr(TS_F_ESS_ADD_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE); 974 goto err; 975 } 976 977 OPENSSL_free(pp); 978 pp = NULL; 979 return PKCS7_add_signed_attribute(si, 980 NID_id_smime_aa_signingCertificateV2, 981 V_ASN1_SEQUENCE, seq); 982 err: 983 ASN1_STRING_free(seq); 984 OPENSSL_free(pp); 985 return 0; 986 } 987 988 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision( 989 ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec, 990 unsigned precision) 991 { 992 time_t time_sec = (time_t)sec; 993 struct tm *tm = NULL, tm_result; 994 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 995 char *p = genTime_str; 996 char *p_end = genTime_str + sizeof(genTime_str); 997 998 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 999 goto err; 1000 1001 if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL) 1002 goto err; 1003 1004 /* 1005 * Put "genTime_str" in GeneralizedTime format. We work around the 1006 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 1007 * NOT include fractional seconds") and OpenSSL related functions to 1008 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 1009 * fraction-of-second details". 1010 */ 1011 p += BIO_snprintf(p, p_end - p, 1012 "%04d%02d%02d%02d%02d%02d", 1013 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 1014 tm->tm_hour, tm->tm_min, tm->tm_sec); 1015 if (precision > 0) { 1016 BIO_snprintf(p, 2 + precision, ".%06ld", usec); 1017 p += strlen(p); 1018 1019 /* 1020 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the 1021 * following restrictions for a DER-encoding, which OpenSSL 1022 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 1023 * support: "The encoding MUST terminate with a "Z" (which means 1024 * "Zulu" time). The decimal point element, if present, MUST be the 1025 * point option ".". The fractional-seconds elements, if present, 1026 * MUST omit all trailing 0's; if the elements correspond to 0, they 1027 * MUST be wholly omitted, and the decimal point element also MUST be 1028 * omitted." 1029 */ 1030 /* 1031 * Remove trailing zeros. The dot guarantees the exit condition of 1032 * this loop even if all the digits are zero. 1033 */ 1034 while (*--p == '0') 1035 continue; 1036 if (*p != '.') 1037 ++p; 1038 } 1039 *p++ = 'Z'; 1040 *p++ = '\0'; 1041 1042 if (asn1_time == NULL 1043 && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL) 1044 goto err; 1045 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1046 ASN1_GENERALIZEDTIME_free(asn1_time); 1047 goto err; 1048 } 1049 return asn1_time; 1050 1051 err: 1052 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME); 1053 return NULL; 1054 } 1055 1056 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md) 1057 { 1058 ctx->ess_cert_id_digest = md; 1059 return 1; 1060 } 1061