1 /* 2 * Copyright 2006-2018 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_lcl.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 return serial; 61 62 err: 63 TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE); 64 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 65 "Error during serial number generation."); 66 return NULL; 67 } 68 69 #if defined(OPENSSL_SYS_UNIX) 70 71 static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 72 long *sec, long *usec) 73 { 74 struct timeval tv; 75 if (gettimeofday(&tv, NULL) != 0) { 76 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 77 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 78 "Time is not available."); 79 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 80 return 0; 81 } 82 *sec = tv.tv_sec; 83 *usec = tv.tv_usec; 84 85 return 1; 86 } 87 88 #else 89 90 static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 91 long *sec, long *usec) 92 { 93 time_t t; 94 if (time(&t) == (time_t)-1) { 95 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 96 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 97 "Time is not available."); 98 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 99 return 0; 100 } 101 *sec = (long)t; 102 *usec = 0; 103 104 return 1; 105 } 106 107 #endif 108 109 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, 110 void *data) 111 { 112 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 113 "Unsupported extension."); 114 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 115 return 0; 116 } 117 118 /* TS_RESP_CTX management functions. */ 119 120 TS_RESP_CTX *TS_RESP_CTX_new(void) 121 { 122 TS_RESP_CTX *ctx; 123 124 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) { 125 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE); 126 return NULL; 127 } 128 129 ctx->signer_md = EVP_sha256(); 130 131 ctx->serial_cb = def_serial_cb; 132 ctx->time_cb = def_time_cb; 133 ctx->extension_cb = def_extension_cb; 134 135 return ctx; 136 } 137 138 void TS_RESP_CTX_free(TS_RESP_CTX *ctx) 139 { 140 if (!ctx) 141 return; 142 143 X509_free(ctx->signer_cert); 144 EVP_PKEY_free(ctx->signer_key); 145 sk_X509_pop_free(ctx->certs, X509_free); 146 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 147 ASN1_OBJECT_free(ctx->default_policy); 148 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 149 ASN1_INTEGER_free(ctx->seconds); 150 ASN1_INTEGER_free(ctx->millis); 151 ASN1_INTEGER_free(ctx->micros); 152 OPENSSL_free(ctx); 153 } 154 155 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 156 { 157 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 158 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 159 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 160 return 0; 161 } 162 X509_free(ctx->signer_cert); 163 ctx->signer_cert = signer; 164 X509_up_ref(ctx->signer_cert); 165 return 1; 166 } 167 168 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 169 { 170 EVP_PKEY_free(ctx->signer_key); 171 ctx->signer_key = key; 172 EVP_PKEY_up_ref(ctx->signer_key); 173 174 return 1; 175 } 176 177 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md) 178 { 179 ctx->signer_md = md; 180 return 1; 181 } 182 183 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy) 184 { 185 ASN1_OBJECT_free(ctx->default_policy); 186 if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL) 187 goto err; 188 return 1; 189 err: 190 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE); 191 return 0; 192 } 193 194 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 195 { 196 197 sk_X509_pop_free(ctx->certs, X509_free); 198 ctx->certs = NULL; 199 if (!certs) 200 return 1; 201 if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) { 202 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE); 203 return 0; 204 } 205 206 return 1; 207 } 208 209 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy) 210 { 211 ASN1_OBJECT *copy = NULL; 212 213 if (ctx->policies == NULL 214 && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL) 215 goto err; 216 if ((copy = OBJ_dup(policy)) == NULL) 217 goto err; 218 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 219 goto err; 220 221 return 1; 222 err: 223 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE); 224 ASN1_OBJECT_free(copy); 225 return 0; 226 } 227 228 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 229 { 230 if (ctx->mds == NULL 231 && (ctx->mds = sk_EVP_MD_new_null()) == NULL) 232 goto err; 233 if (!sk_EVP_MD_push(ctx->mds, md)) 234 goto err; 235 236 return 1; 237 err: 238 TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE); 239 return 0; 240 } 241 242 #define TS_RESP_CTX_accuracy_free(ctx) \ 243 ASN1_INTEGER_free(ctx->seconds); \ 244 ctx->seconds = NULL; \ 245 ASN1_INTEGER_free(ctx->millis); \ 246 ctx->millis = NULL; \ 247 ASN1_INTEGER_free(ctx->micros); \ 248 ctx->micros = NULL; 249 250 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 251 int secs, int millis, int micros) 252 { 253 254 TS_RESP_CTX_accuracy_free(ctx); 255 if (secs 256 && ((ctx->seconds = ASN1_INTEGER_new()) == NULL 257 || !ASN1_INTEGER_set(ctx->seconds, secs))) 258 goto err; 259 if (millis 260 && ((ctx->millis = ASN1_INTEGER_new()) == NULL 261 || !ASN1_INTEGER_set(ctx->millis, millis))) 262 goto err; 263 if (micros 264 && ((ctx->micros = ASN1_INTEGER_new()) == NULL 265 || !ASN1_INTEGER_set(ctx->micros, micros))) 266 goto err; 267 268 return 1; 269 err: 270 TS_RESP_CTX_accuracy_free(ctx); 271 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE); 272 return 0; 273 } 274 275 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 276 { 277 ctx->flags |= flags; 278 } 279 280 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 281 { 282 ctx->serial_cb = cb; 283 ctx->serial_cb_data = data; 284 } 285 286 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data) 287 { 288 ctx->time_cb = cb; 289 ctx->time_cb_data = data; 290 } 291 292 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 293 TS_extension_cb cb, void *data) 294 { 295 ctx->extension_cb = cb; 296 ctx->extension_cb_data = data; 297 } 298 299 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 300 int status, const char *text) 301 { 302 TS_STATUS_INFO *si = NULL; 303 ASN1_UTF8STRING *utf8_text = NULL; 304 int ret = 0; 305 306 if ((si = TS_STATUS_INFO_new()) == NULL) 307 goto err; 308 if (!ASN1_INTEGER_set(si->status, status)) 309 goto err; 310 if (text) { 311 if ((utf8_text = ASN1_UTF8STRING_new()) == NULL 312 || !ASN1_STRING_set(utf8_text, text, strlen(text))) 313 goto err; 314 if (si->text == NULL 315 && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL) 316 goto err; 317 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 318 goto err; 319 utf8_text = NULL; /* Ownership is lost. */ 320 } 321 if (!TS_RESP_set_status_info(ctx->response, si)) 322 goto err; 323 ret = 1; 324 err: 325 if (!ret) 326 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE); 327 TS_STATUS_INFO_free(si); 328 ASN1_UTF8STRING_free(utf8_text); 329 return ret; 330 } 331 332 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 333 int status, const char *text) 334 { 335 int ret = 1; 336 TS_STATUS_INFO *si = ctx->response->status_info; 337 338 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 339 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 340 } 341 return ret; 342 } 343 344 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 345 { 346 TS_STATUS_INFO *si = ctx->response->status_info; 347 if (si->failure_info == NULL 348 && (si->failure_info = ASN1_BIT_STRING_new()) == NULL) 349 goto err; 350 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 351 goto err; 352 return 1; 353 err: 354 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE); 355 return 0; 356 } 357 358 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 359 { 360 return ctx->request; 361 } 362 363 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 364 { 365 return ctx->tst_info; 366 } 367 368 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, 369 unsigned precision) 370 { 371 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 372 return 0; 373 ctx->clock_precision_digits = precision; 374 return 1; 375 } 376 377 /* Main entry method of the response generation. */ 378 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 379 { 380 ASN1_OBJECT *policy; 381 TS_RESP *response; 382 int result = 0; 383 384 ts_RESP_CTX_init(ctx); 385 386 if ((ctx->response = TS_RESP_new()) == NULL) { 387 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE); 388 goto end; 389 } 390 if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) { 391 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 392 "Bad request format or system error."); 393 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 394 goto end; 395 } 396 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 397 goto end; 398 if (!ts_RESP_check_request(ctx)) 399 goto end; 400 if ((policy = ts_RESP_get_policy(ctx)) == NULL) 401 goto end; 402 if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL) 403 goto end; 404 if (!ts_RESP_process_extensions(ctx)) 405 goto end; 406 if (!ts_RESP_sign(ctx)) 407 goto end; 408 result = 1; 409 410 end: 411 if (!result) { 412 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR); 413 if (ctx->response != NULL) { 414 if (TS_RESP_CTX_set_status_info_cond(ctx, 415 TS_STATUS_REJECTION, 416 "Error during response " 417 "generation.") == 0) { 418 TS_RESP_free(ctx->response); 419 ctx->response = NULL; 420 } 421 } 422 } 423 response = ctx->response; 424 ctx->response = NULL; /* Ownership will be returned to caller. */ 425 ts_RESP_CTX_cleanup(ctx); 426 return response; 427 } 428 429 /* Initializes the variable part of the context. */ 430 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx) 431 { 432 ctx->request = NULL; 433 ctx->response = NULL; 434 ctx->tst_info = NULL; 435 } 436 437 /* Cleans up the variable part of the context. */ 438 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 439 { 440 TS_REQ_free(ctx->request); 441 ctx->request = NULL; 442 TS_RESP_free(ctx->response); 443 ctx->response = NULL; 444 TS_TST_INFO_free(ctx->tst_info); 445 ctx->tst_info = NULL; 446 } 447 448 /* Checks the format and content of the request. */ 449 static int ts_RESP_check_request(TS_RESP_CTX *ctx) 450 { 451 TS_REQ *request = ctx->request; 452 TS_MSG_IMPRINT *msg_imprint; 453 X509_ALGOR *md_alg; 454 int md_alg_id; 455 const ASN1_OCTET_STRING *digest; 456 const EVP_MD *md = NULL; 457 int i; 458 459 if (TS_REQ_get_version(request) != 1) { 460 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 461 "Bad request version."); 462 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 463 return 0; 464 } 465 466 msg_imprint = request->msg_imprint; 467 md_alg = msg_imprint->hash_algo; 468 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 469 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 470 const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 471 if (md_alg_id == EVP_MD_type(current_md)) 472 md = current_md; 473 } 474 if (!md) { 475 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 476 "Message digest algorithm is " 477 "not supported."); 478 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 479 return 0; 480 } 481 482 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 483 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 484 "Superfluous message digest " 485 "parameter."); 486 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 487 return 0; 488 } 489 digest = msg_imprint->hashed_msg; 490 if (digest->length != EVP_MD_size(md)) { 491 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 492 "Bad message digest."); 493 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 494 return 0; 495 } 496 497 return 1; 498 } 499 500 /* Returns the TSA policy based on the requested and acceptable policies. */ 501 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx) 502 { 503 ASN1_OBJECT *requested = ctx->request->policy_id; 504 ASN1_OBJECT *policy = NULL; 505 int i; 506 507 if (ctx->default_policy == NULL) { 508 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER); 509 return NULL; 510 } 511 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 512 policy = ctx->default_policy; 513 514 /* Check if the policy is acceptable. */ 515 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 516 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 517 if (!OBJ_cmp(requested, current)) 518 policy = current; 519 } 520 if (!policy) { 521 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY); 522 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 523 "Requested policy is not " "supported."); 524 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 525 } 526 return policy; 527 } 528 529 /* Creates the TS_TST_INFO object based on the settings of the context. */ 530 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, 531 ASN1_OBJECT *policy) 532 { 533 int result = 0; 534 TS_TST_INFO *tst_info = NULL; 535 ASN1_INTEGER *serial = NULL; 536 ASN1_GENERALIZEDTIME *asn1_time = NULL; 537 long sec, usec; 538 TS_ACCURACY *accuracy = NULL; 539 const ASN1_INTEGER *nonce; 540 GENERAL_NAME *tsa_name = NULL; 541 542 if ((tst_info = TS_TST_INFO_new()) == NULL) 543 goto end; 544 if (!TS_TST_INFO_set_version(tst_info, 1)) 545 goto end; 546 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 547 goto end; 548 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 549 goto end; 550 if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL 551 || !TS_TST_INFO_set_serial(tst_info, serial)) 552 goto end; 553 if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec) 554 || (asn1_time = 555 TS_RESP_set_genTime_with_precision(NULL, sec, usec, 556 ctx->clock_precision_digits)) == NULL 557 || !TS_TST_INFO_set_time(tst_info, asn1_time)) 558 goto end; 559 560 if ((ctx->seconds || ctx->millis || ctx->micros) 561 && (accuracy = TS_ACCURACY_new()) == NULL) 562 goto end; 563 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 564 goto end; 565 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 566 goto end; 567 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 568 goto end; 569 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 570 goto end; 571 572 if ((ctx->flags & TS_ORDERING) 573 && !TS_TST_INFO_set_ordering(tst_info, 1)) 574 goto end; 575 576 if ((nonce = ctx->request->nonce) != NULL 577 && !TS_TST_INFO_set_nonce(tst_info, nonce)) 578 goto end; 579 580 if (ctx->flags & TS_TSA_NAME) { 581 if ((tsa_name = GENERAL_NAME_new()) == NULL) 582 goto end; 583 tsa_name->type = GEN_DIRNAME; 584 tsa_name->d.dirn = 585 X509_NAME_dup(X509_get_subject_name(ctx->signer_cert)); 586 if (!tsa_name->d.dirn) 587 goto end; 588 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 589 goto end; 590 } 591 592 result = 1; 593 end: 594 if (!result) { 595 TS_TST_INFO_free(tst_info); 596 tst_info = NULL; 597 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR); 598 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 599 "Error during TSTInfo " 600 "generation."); 601 } 602 GENERAL_NAME_free(tsa_name); 603 TS_ACCURACY_free(accuracy); 604 ASN1_GENERALIZEDTIME_free(asn1_time); 605 ASN1_INTEGER_free(serial); 606 607 return tst_info; 608 } 609 610 /* Processing the extensions of the request. */ 611 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx) 612 { 613 STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions; 614 int i; 615 int ok = 1; 616 617 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 618 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 619 /* 620 * The last argument was previously (void *)ctx->extension_cb, 621 * but ISO C doesn't permit converting a function pointer to void *. 622 * For lack of better information, I'm placing a NULL there instead. 623 * The callback can pick its own address out from the ctx anyway... 624 */ 625 ok = (*ctx->extension_cb) (ctx, ext, NULL); 626 } 627 628 return ok; 629 } 630 631 /* Functions for signing the TS_TST_INFO structure of the context. */ 632 static int ts_RESP_sign(TS_RESP_CTX *ctx) 633 { 634 int ret = 0; 635 PKCS7 *p7 = NULL; 636 PKCS7_SIGNER_INFO *si; 637 STACK_OF(X509) *certs; /* Certificates to include in sc. */ 638 ESS_SIGNING_CERT_V2 *sc2 = NULL; 639 ESS_SIGNING_CERT *sc = NULL; 640 ASN1_OBJECT *oid; 641 BIO *p7bio = NULL; 642 int i; 643 644 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { 645 TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 646 goto err; 647 } 648 649 if ((p7 = PKCS7_new()) == NULL) { 650 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 651 goto err; 652 } 653 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 654 goto err; 655 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 656 goto err; 657 658 if (ctx->request->cert_req) { 659 PKCS7_add_certificate(p7, ctx->signer_cert); 660 if (ctx->certs) { 661 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 662 X509 *cert = sk_X509_value(ctx->certs, i); 663 PKCS7_add_certificate(p7, cert); 664 } 665 } 666 } 667 668 if ((si = PKCS7_add_signature(p7, ctx->signer_cert, 669 ctx->signer_key, ctx->signer_md)) == NULL) { 670 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR); 671 goto err; 672 } 673 674 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 675 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 676 V_ASN1_OBJECT, oid)) { 677 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 678 goto err; 679 } 680 681 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; 682 if (ctx->ess_cert_id_digest == NULL 683 || ctx->ess_cert_id_digest == EVP_sha1()) { 684 if ((sc = ess_SIGNING_CERT_new_init(ctx->signer_cert, certs)) == NULL) 685 goto err; 686 687 if (!ess_add_signing_cert(si, sc)) { 688 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR); 689 goto err; 690 } 691 } else { 692 sc2 = ess_signing_cert_v2_new_init(ctx->ess_cert_id_digest, 693 ctx->signer_cert, certs); 694 if (sc2 == NULL) 695 goto err; 696 697 if (!ess_add_signing_cert_v2(si, sc2)) { 698 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR); 699 goto err; 700 } 701 } 702 703 if (!ts_TST_INFO_content_new(p7)) 704 goto err; 705 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) { 706 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 707 goto err; 708 } 709 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { 710 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN); 711 goto err; 712 } 713 if (!PKCS7_dataFinal(p7, p7bio)) { 714 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN); 715 goto err; 716 } 717 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); 718 p7 = NULL; /* Ownership is lost. */ 719 ctx->tst_info = NULL; /* Ownership is lost. */ 720 721 ret = 1; 722 err: 723 if (!ret) 724 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 725 "Error during signature " 726 "generation."); 727 BIO_free_all(p7bio); 728 ESS_SIGNING_CERT_V2_free(sc2); 729 ESS_SIGNING_CERT_free(sc); 730 PKCS7_free(p7); 731 return ret; 732 } 733 734 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert, 735 STACK_OF(X509) *certs) 736 { 737 ESS_CERT_ID *cid; 738 ESS_SIGNING_CERT *sc = NULL; 739 int i; 740 741 if ((sc = ESS_SIGNING_CERT_new()) == NULL) 742 goto err; 743 if (sc->cert_ids == NULL 744 && (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL) 745 goto err; 746 747 if ((cid = ess_CERT_ID_new_init(signcert, 0)) == NULL 748 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 749 goto err; 750 for (i = 0; i < sk_X509_num(certs); ++i) { 751 X509 *cert = sk_X509_value(certs, i); 752 if ((cid = ess_CERT_ID_new_init(cert, 1)) == NULL 753 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 754 goto err; 755 } 756 757 return sc; 758 err: 759 ESS_SIGNING_CERT_free(sc); 760 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE); 761 return NULL; 762 } 763 764 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed) 765 { 766 ESS_CERT_ID *cid = NULL; 767 GENERAL_NAME *name = NULL; 768 unsigned char cert_sha1[SHA_DIGEST_LENGTH]; 769 770 /* Call for side-effect of computing hash and caching extensions */ 771 X509_check_purpose(cert, -1, 0); 772 if ((cid = ESS_CERT_ID_new()) == NULL) 773 goto err; 774 X509_digest(cert, EVP_sha1(), cert_sha1, NULL); 775 if (!ASN1_OCTET_STRING_set(cid->hash, cert_sha1, SHA_DIGEST_LENGTH)) 776 goto err; 777 778 /* Setting the issuer/serial if requested. */ 779 if (issuer_needed) { 780 if (cid->issuer_serial == NULL 781 && (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL) 782 goto err; 783 if ((name = GENERAL_NAME_new()) == NULL) 784 goto err; 785 name->type = GEN_DIRNAME; 786 if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL) 787 goto err; 788 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 789 goto err; 790 name = NULL; /* Ownership is lost. */ 791 ASN1_INTEGER_free(cid->issuer_serial->serial); 792 if (!(cid->issuer_serial->serial = 793 ASN1_INTEGER_dup(X509_get_serialNumber(cert)))) 794 goto err; 795 } 796 797 return cid; 798 err: 799 GENERAL_NAME_free(name); 800 ESS_CERT_ID_free(cid); 801 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE); 802 return NULL; 803 } 804 805 static int ts_TST_INFO_content_new(PKCS7 *p7) 806 { 807 PKCS7 *ret = NULL; 808 ASN1_OCTET_STRING *octet_string = NULL; 809 810 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 811 if ((ret = PKCS7_new()) == NULL) 812 goto err; 813 if ((ret->d.other = ASN1_TYPE_new()) == NULL) 814 goto err; 815 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 816 if ((octet_string = ASN1_OCTET_STRING_new()) == NULL) 817 goto err; 818 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 819 octet_string = NULL; 820 821 /* Add encapsulated content to signed PKCS7 structure. */ 822 if (!PKCS7_set_content(p7, ret)) 823 goto err; 824 825 return 1; 826 err: 827 ASN1_OCTET_STRING_free(octet_string); 828 PKCS7_free(ret); 829 return 0; 830 } 831 832 static int ess_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 833 { 834 ASN1_STRING *seq = NULL; 835 unsigned char *p, *pp = NULL; 836 int len; 837 838 len = i2d_ESS_SIGNING_CERT(sc, NULL); 839 if ((pp = OPENSSL_malloc(len)) == NULL) { 840 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 841 goto err; 842 } 843 p = pp; 844 i2d_ESS_SIGNING_CERT(sc, &p); 845 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { 846 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 847 goto err; 848 } 849 OPENSSL_free(pp); 850 pp = NULL; 851 return PKCS7_add_signed_attribute(si, 852 NID_id_smime_aa_signingCertificate, 853 V_ASN1_SEQUENCE, seq); 854 err: 855 ASN1_STRING_free(seq); 856 OPENSSL_free(pp); 857 858 return 0; 859 } 860 861 static ESS_SIGNING_CERT_V2 *ess_signing_cert_v2_new_init(const EVP_MD *hash_alg, 862 X509 *signcert, 863 STACK_OF(X509) *certs) 864 { 865 ESS_CERT_ID_V2 *cid = NULL; 866 ESS_SIGNING_CERT_V2 *sc = NULL; 867 int i; 868 869 if ((sc = ESS_SIGNING_CERT_V2_new()) == NULL) 870 goto err; 871 if ((cid = ess_cert_id_v2_new_init(hash_alg, signcert, 0)) == NULL) 872 goto err; 873 if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid)) 874 goto err; 875 cid = NULL; 876 877 for (i = 0; i < sk_X509_num(certs); ++i) { 878 X509 *cert = sk_X509_value(certs, i); 879 880 if ((cid = ess_cert_id_v2_new_init(hash_alg, cert, 1)) == NULL) 881 goto err; 882 if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid)) 883 goto err; 884 cid = NULL; 885 } 886 887 return sc; 888 err: 889 ESS_SIGNING_CERT_V2_free(sc); 890 ESS_CERT_ID_V2_free(cid); 891 TSerr(TS_F_ESS_SIGNING_CERT_V2_NEW_INIT, ERR_R_MALLOC_FAILURE); 892 return NULL; 893 } 894 895 static ESS_CERT_ID_V2 *ess_cert_id_v2_new_init(const EVP_MD *hash_alg, 896 X509 *cert, int issuer_needed) 897 { 898 ESS_CERT_ID_V2 *cid = NULL; 899 GENERAL_NAME *name = NULL; 900 unsigned char hash[EVP_MAX_MD_SIZE]; 901 unsigned int hash_len = sizeof(hash); 902 X509_ALGOR *alg = NULL; 903 904 memset(hash, 0, sizeof(hash)); 905 906 if ((cid = ESS_CERT_ID_V2_new()) == NULL) 907 goto err; 908 909 if (hash_alg != EVP_sha256()) { 910 alg = X509_ALGOR_new(); 911 if (alg == NULL) 912 goto err; 913 X509_ALGOR_set_md(alg, hash_alg); 914 if (alg->algorithm == NULL) 915 goto err; 916 cid->hash_alg = alg; 917 alg = NULL; 918 } else { 919 cid->hash_alg = NULL; 920 } 921 922 if (!X509_digest(cert, hash_alg, hash, &hash_len)) 923 goto err; 924 925 if (!ASN1_OCTET_STRING_set(cid->hash, hash, hash_len)) 926 goto err; 927 928 if (issuer_needed) { 929 if ((cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL) 930 goto err; 931 if ((name = GENERAL_NAME_new()) == NULL) 932 goto err; 933 name->type = GEN_DIRNAME; 934 if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL) 935 goto err; 936 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 937 goto err; 938 name = NULL; /* Ownership is lost. */ 939 ASN1_INTEGER_free(cid->issuer_serial->serial); 940 cid->issuer_serial->serial = 941 ASN1_INTEGER_dup(X509_get_serialNumber(cert)); 942 if (cid->issuer_serial->serial == NULL) 943 goto err; 944 } 945 946 return cid; 947 err: 948 X509_ALGOR_free(alg); 949 GENERAL_NAME_free(name); 950 ESS_CERT_ID_V2_free(cid); 951 TSerr(TS_F_ESS_CERT_ID_V2_NEW_INIT, ERR_R_MALLOC_FAILURE); 952 return NULL; 953 } 954 955 static int ess_add_signing_cert_v2(PKCS7_SIGNER_INFO *si, 956 ESS_SIGNING_CERT_V2 *sc) 957 { 958 ASN1_STRING *seq = NULL; 959 unsigned char *p, *pp = NULL; 960 int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL); 961 962 if ((pp = OPENSSL_malloc(len)) == NULL) { 963 TSerr(TS_F_ESS_ADD_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE); 964 goto err; 965 } 966 967 p = pp; 968 i2d_ESS_SIGNING_CERT_V2(sc, &p); 969 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { 970 TSerr(TS_F_ESS_ADD_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE); 971 goto err; 972 } 973 974 OPENSSL_free(pp); 975 pp = NULL; 976 return PKCS7_add_signed_attribute(si, 977 NID_id_smime_aa_signingCertificateV2, 978 V_ASN1_SEQUENCE, seq); 979 err: 980 ASN1_STRING_free(seq); 981 OPENSSL_free(pp); 982 return 0; 983 } 984 985 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision( 986 ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec, 987 unsigned precision) 988 { 989 time_t time_sec = (time_t)sec; 990 struct tm *tm = NULL, tm_result; 991 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 992 char *p = genTime_str; 993 char *p_end = genTime_str + sizeof(genTime_str); 994 995 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 996 goto err; 997 998 if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL) 999 goto err; 1000 1001 /* 1002 * Put "genTime_str" in GeneralizedTime format. We work around the 1003 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 1004 * NOT include fractional seconds") and OpenSSL related functions to 1005 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 1006 * fraction-of-second details". 1007 */ 1008 p += BIO_snprintf(p, p_end - p, 1009 "%04d%02d%02d%02d%02d%02d", 1010 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 1011 tm->tm_hour, tm->tm_min, tm->tm_sec); 1012 if (precision > 0) { 1013 BIO_snprintf(p, 2 + precision, ".%06ld", usec); 1014 p += strlen(p); 1015 1016 /* 1017 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the 1018 * following restrictions for a DER-encoding, which OpenSSL 1019 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 1020 * support: "The encoding MUST terminate with a "Z" (which means 1021 * "Zulu" time). The decimal point element, if present, MUST be the 1022 * point option ".". The fractional-seconds elements, if present, 1023 * MUST omit all trailing 0's; if the elements correspond to 0, they 1024 * MUST be wholly omitted, and the decimal point element also MUST be 1025 * omitted." 1026 */ 1027 /* 1028 * Remove trailing zeros. The dot guarantees the exit condition of 1029 * this loop even if all the digits are zero. 1030 */ 1031 while (*--p == '0') 1032 continue; 1033 if (*p != '.') 1034 ++p; 1035 } 1036 *p++ = 'Z'; 1037 *p++ = '\0'; 1038 1039 if (asn1_time == NULL 1040 && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL) 1041 goto err; 1042 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1043 ASN1_GENERALIZEDTIME_free(asn1_time); 1044 goto err; 1045 } 1046 return asn1_time; 1047 1048 err: 1049 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME); 1050 return NULL; 1051 } 1052 1053 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md) 1054 { 1055 ctx->ess_cert_id_digest = md; 1056 return 1; 1057 } 1058