1/* 2 * Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (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 12#include <openssl/objects.h> 13#include <openssl/ts.h> 14#include <openssl/pkcs7.h> 15#include <openssl/crypto.h> 16#include "internal/cryptlib.h" 17#include "internal/sizes.h" 18#include "crypto/ess.h" 19#include "ts_local.h" 20 21DEFINE_STACK_OF_CONST(EVP_MD) 22 23static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *); 24static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec); 25static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *); 26 27static void ts_RESP_CTX_init(TS_RESP_CTX *ctx); 28static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx); 29static int ts_RESP_check_request(TS_RESP_CTX *ctx); 30static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx); 31static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, 32 ASN1_OBJECT *policy); 33static int ts_RESP_process_extensions(TS_RESP_CTX *ctx); 34static int ts_RESP_sign(TS_RESP_CTX *ctx); 35 36static int ts_TST_INFO_content_new(PKCS7 *p7); 37 38static ASN1_GENERALIZEDTIME 39*TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long, 40 unsigned); 41 42/* Default callback for response generation. */ 43static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data) 44{ 45 ASN1_INTEGER *serial = ASN1_INTEGER_new(); 46 47 if (serial == NULL) 48 goto err; 49 if (!ASN1_INTEGER_set(serial, 1)) 50 goto err; 51 return serial; 52 53 err: 54 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 55 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 56 "Error during serial number generation."); 57 ASN1_INTEGER_free(serial); 58 return NULL; 59} 60 61#if defined(OPENSSL_SYS_UNIX) 62 63static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 64 long *sec, long *usec) 65{ 66 struct timeval tv; 67 if (gettimeofday(&tv, NULL) != 0) { 68 ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR); 69 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 70 "Time is not available."); 71 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 72 return 0; 73 } 74 *sec = tv.tv_sec; 75 *usec = tv.tv_usec; 76 77 return 1; 78} 79 80#else 81 82static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 83 long *sec, long *usec) 84{ 85 time_t t; 86 if (time(&t) == (time_t)-1) { 87 ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR); 88 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 89 "Time is not available."); 90 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 91 return 0; 92 } 93 *sec = (long)t; 94 *usec = 0; 95 96 return 1; 97} 98 99#endif 100 101static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, 102 void *data) 103{ 104 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 105 "Unsupported extension."); 106 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 107 return 0; 108} 109 110/* TS_RESP_CTX management functions. */ 111 112TS_RESP_CTX *TS_RESP_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq) 113{ 114 TS_RESP_CTX *ctx; 115 116 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) { 117 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 118 return NULL; 119 } 120 121 if (propq != NULL) { 122 ctx->propq = OPENSSL_strdup(propq); 123 if (ctx->propq == NULL) { 124 OPENSSL_free(ctx); 125 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 126 return NULL; 127 } 128 } 129 ctx->libctx = libctx; 130 ctx->serial_cb = def_serial_cb; 131 ctx->time_cb = def_time_cb; 132 ctx->extension_cb = def_extension_cb; 133 134 return ctx; 135} 136 137TS_RESP_CTX *TS_RESP_CTX_new(void) 138{ 139 return TS_RESP_CTX_new_ex(NULL, NULL); 140} 141 142void TS_RESP_CTX_free(TS_RESP_CTX *ctx) 143{ 144 if (!ctx) 145 return; 146 147 OPENSSL_free(ctx->propq); 148 X509_free(ctx->signer_cert); 149 EVP_PKEY_free(ctx->signer_key); 150 sk_X509_pop_free(ctx->certs, X509_free); 151 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 152 ASN1_OBJECT_free(ctx->default_policy); 153 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 154 ASN1_INTEGER_free(ctx->seconds); 155 ASN1_INTEGER_free(ctx->millis); 156 ASN1_INTEGER_free(ctx->micros); 157 OPENSSL_free(ctx); 158} 159 160int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 161{ 162 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 163 ERR_raise(ERR_LIB_TS, TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 164 return 0; 165 } 166 X509_free(ctx->signer_cert); 167 ctx->signer_cert = signer; 168 X509_up_ref(ctx->signer_cert); 169 return 1; 170} 171 172int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 173{ 174 EVP_PKEY_free(ctx->signer_key); 175 ctx->signer_key = key; 176 EVP_PKEY_up_ref(ctx->signer_key); 177 178 return 1; 179} 180 181int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md) 182{ 183 ctx->signer_md = md; 184 return 1; 185} 186 187int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy) 188{ 189 ASN1_OBJECT_free(ctx->default_policy); 190 if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL) 191 goto err; 192 return 1; 193 err: 194 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 195 return 0; 196} 197 198int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 199{ 200 sk_X509_pop_free(ctx->certs, X509_free); 201 ctx->certs = NULL; 202 203 return certs == NULL || (ctx->certs = X509_chain_up_ref(certs)) != NULL; 204} 205 206int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy) 207{ 208 ASN1_OBJECT *copy = NULL; 209 210 if (ctx->policies == NULL 211 && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL) 212 goto err; 213 if ((copy = OBJ_dup(policy)) == NULL) 214 goto err; 215 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 216 goto err; 217 218 return 1; 219 err: 220 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 221 ASN1_OBJECT_free(copy); 222 return 0; 223} 224 225int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 226{ 227 if (ctx->mds == NULL 228 && (ctx->mds = sk_EVP_MD_new_null()) == NULL) 229 goto err; 230 if (!sk_EVP_MD_push(ctx->mds, md)) 231 goto err; 232 233 return 1; 234 err: 235 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 236 return 0; 237} 238 239#define TS_RESP_CTX_accuracy_free(ctx) \ 240 ASN1_INTEGER_free(ctx->seconds); \ 241 ctx->seconds = NULL; \ 242 ASN1_INTEGER_free(ctx->millis); \ 243 ctx->millis = NULL; \ 244 ASN1_INTEGER_free(ctx->micros); \ 245 ctx->micros = NULL; 246 247int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 248 int secs, int millis, int micros) 249{ 250 251 TS_RESP_CTX_accuracy_free(ctx); 252 if (secs 253 && ((ctx->seconds = ASN1_INTEGER_new()) == NULL 254 || !ASN1_INTEGER_set(ctx->seconds, secs))) 255 goto err; 256 if (millis 257 && ((ctx->millis = ASN1_INTEGER_new()) == NULL 258 || !ASN1_INTEGER_set(ctx->millis, millis))) 259 goto err; 260 if (micros 261 && ((ctx->micros = ASN1_INTEGER_new()) == NULL 262 || !ASN1_INTEGER_set(ctx->micros, micros))) 263 goto err; 264 265 return 1; 266 err: 267 TS_RESP_CTX_accuracy_free(ctx); 268 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 269 return 0; 270} 271 272void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 273{ 274 ctx->flags |= flags; 275} 276 277void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 278{ 279 ctx->serial_cb = cb; 280 ctx->serial_cb_data = data; 281} 282 283void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data) 284{ 285 ctx->time_cb = cb; 286 ctx->time_cb_data = data; 287} 288 289void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 290 TS_extension_cb cb, void *data) 291{ 292 ctx->extension_cb = cb; 293 ctx->extension_cb_data = data; 294} 295 296int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 297 int status, const char *text) 298{ 299 TS_STATUS_INFO *si = NULL; 300 ASN1_UTF8STRING *utf8_text = NULL; 301 int ret = 0; 302 303 if ((si = TS_STATUS_INFO_new()) == NULL) 304 goto err; 305 if (!ASN1_INTEGER_set(si->status, status)) 306 goto err; 307 if (text) { 308 if ((utf8_text = ASN1_UTF8STRING_new()) == NULL 309 || !ASN1_STRING_set(utf8_text, text, strlen(text))) 310 goto err; 311 if (si->text == NULL 312 && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL) 313 goto err; 314 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 315 goto err; 316 utf8_text = NULL; /* Ownership is lost. */ 317 } 318 if (!TS_RESP_set_status_info(ctx->response, si)) 319 goto err; 320 ret = 1; 321 err: 322 if (!ret) 323 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 324 TS_STATUS_INFO_free(si); 325 ASN1_UTF8STRING_free(utf8_text); 326 return ret; 327} 328 329int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 330 int status, const char *text) 331{ 332 int ret = 1; 333 TS_STATUS_INFO *si = ctx->response->status_info; 334 335 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 336 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 337 } 338 return ret; 339} 340 341int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 342{ 343 TS_STATUS_INFO *si = ctx->response->status_info; 344 if (si->failure_info == NULL 345 && (si->failure_info = ASN1_BIT_STRING_new()) == NULL) 346 goto err; 347 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 348 goto err; 349 return 1; 350 err: 351 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 352 return 0; 353} 354 355TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 356{ 357 return ctx->request; 358} 359 360TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 361{ 362 return ctx->tst_info; 363} 364 365int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, 366 unsigned precision) 367{ 368 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 369 return 0; 370 ctx->clock_precision_digits = precision; 371 return 1; 372} 373 374/* Main entry method of the response generation. */ 375TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 376{ 377 ASN1_OBJECT *policy; 378 TS_RESP *response; 379 int result = 0; 380 381 ts_RESP_CTX_init(ctx); 382 383 if ((ctx->response = TS_RESP_new()) == NULL) { 384 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 385 goto end; 386 } 387 if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) { 388 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 389 "Bad request format or system error."); 390 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 391 goto end; 392 } 393 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 394 goto end; 395 if (!ts_RESP_check_request(ctx)) 396 goto end; 397 if ((policy = ts_RESP_get_policy(ctx)) == NULL) 398 goto end; 399 if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL) 400 goto end; 401 if (!ts_RESP_process_extensions(ctx)) 402 goto end; 403 if (!ts_RESP_sign(ctx)) 404 goto end; 405 result = 1; 406 407 end: 408 if (!result) { 409 ERR_raise(ERR_LIB_TS, TS_R_RESPONSE_SETUP_ERROR); 410 if (ctx->response != NULL) { 411 if (TS_RESP_CTX_set_status_info_cond(ctx, 412 TS_STATUS_REJECTION, 413 "Error during response " 414 "generation.") == 0) { 415 TS_RESP_free(ctx->response); 416 ctx->response = NULL; 417 } 418 } 419 } 420 response = ctx->response; 421 ctx->response = NULL; /* Ownership will be returned to caller. */ 422 ts_RESP_CTX_cleanup(ctx); 423 return response; 424} 425 426/* Initializes the variable part of the context. */ 427static void ts_RESP_CTX_init(TS_RESP_CTX *ctx) 428{ 429 ctx->request = NULL; 430 ctx->response = NULL; 431 ctx->tst_info = NULL; 432} 433 434/* Cleans up the variable part of the context. */ 435static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 436{ 437 TS_REQ_free(ctx->request); 438 ctx->request = NULL; 439 TS_RESP_free(ctx->response); 440 ctx->response = NULL; 441 TS_TST_INFO_free(ctx->tst_info); 442 ctx->tst_info = NULL; 443} 444 445/* Checks the format and content of the request. */ 446static int ts_RESP_check_request(TS_RESP_CTX *ctx) 447{ 448 TS_REQ *request = ctx->request; 449 TS_MSG_IMPRINT *msg_imprint; 450 X509_ALGOR *md_alg; 451 char md_alg_name[OSSL_MAX_NAME_SIZE]; 452 const ASN1_OCTET_STRING *digest; 453 const EVP_MD *md = NULL; 454 int i; 455 456 if (TS_REQ_get_version(request) != 1) { 457 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 458 "Bad request version."); 459 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 460 return 0; 461 } 462 463 msg_imprint = request->msg_imprint; 464 md_alg = msg_imprint->hash_algo; 465 OBJ_obj2txt(md_alg_name, sizeof(md_alg_name), md_alg->algorithm, 0); 466 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 467 const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 468 if (EVP_MD_is_a(current_md, md_alg_name)) 469 md = current_md; 470 } 471 if (!md) { 472 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 473 "Message digest algorithm is " 474 "not supported."); 475 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 476 return 0; 477 } 478 479 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 480 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 481 "Superfluous message digest " 482 "parameter."); 483 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 484 return 0; 485 } 486 digest = msg_imprint->hashed_msg; 487 if (digest->length != EVP_MD_get_size(md)) { 488 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 489 "Bad message digest."); 490 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 491 return 0; 492 } 493 494 return 1; 495} 496 497/* Returns the TSA policy based on the requested and acceptable policies. */ 498static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx) 499{ 500 ASN1_OBJECT *requested = ctx->request->policy_id; 501 ASN1_OBJECT *policy = NULL; 502 int i; 503 504 if (ctx->default_policy == NULL) { 505 ERR_raise(ERR_LIB_TS, TS_R_INVALID_NULL_POINTER); 506 return NULL; 507 } 508 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 509 policy = ctx->default_policy; 510 511 /* Check if the policy is acceptable. */ 512 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 513 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 514 if (!OBJ_cmp(requested, current)) 515 policy = current; 516 } 517 if (policy == NULL) { 518 ERR_raise(ERR_LIB_TS, TS_R_UNACCEPTABLE_POLICY); 519 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 520 "Requested policy is not " "supported."); 521 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 522 } 523 return policy; 524} 525 526/* Creates the TS_TST_INFO object based on the settings of the context. */ 527static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx, 528 ASN1_OBJECT *policy) 529{ 530 int result = 0; 531 TS_TST_INFO *tst_info = NULL; 532 ASN1_INTEGER *serial = NULL; 533 ASN1_GENERALIZEDTIME *asn1_time = NULL; 534 long sec, usec; 535 TS_ACCURACY *accuracy = NULL; 536 const ASN1_INTEGER *nonce; 537 GENERAL_NAME *tsa_name = NULL; 538 539 if ((tst_info = TS_TST_INFO_new()) == NULL) 540 goto end; 541 if (!TS_TST_INFO_set_version(tst_info, 1)) 542 goto end; 543 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 544 goto end; 545 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 546 goto end; 547 if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL 548 || !TS_TST_INFO_set_serial(tst_info, serial)) 549 goto end; 550 if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec) 551 || (asn1_time = 552 TS_RESP_set_genTime_with_precision(NULL, sec, usec, 553 ctx->clock_precision_digits)) == NULL 554 || !TS_TST_INFO_set_time(tst_info, asn1_time)) 555 goto end; 556 557 if ((ctx->seconds || ctx->millis || ctx->micros) 558 && (accuracy = TS_ACCURACY_new()) == NULL) 559 goto end; 560 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 561 goto end; 562 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 563 goto end; 564 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 565 goto end; 566 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 567 goto end; 568 569 if ((ctx->flags & TS_ORDERING) 570 && !TS_TST_INFO_set_ordering(tst_info, 1)) 571 goto end; 572 573 if ((nonce = ctx->request->nonce) != NULL 574 && !TS_TST_INFO_set_nonce(tst_info, nonce)) 575 goto end; 576 577 if (ctx->flags & TS_TSA_NAME) { 578 if ((tsa_name = GENERAL_NAME_new()) == NULL) 579 goto end; 580 tsa_name->type = GEN_DIRNAME; 581 tsa_name->d.dirn = 582 X509_NAME_dup(X509_get_subject_name(ctx->signer_cert)); 583 if (!tsa_name->d.dirn) 584 goto end; 585 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 586 goto end; 587 } 588 589 result = 1; 590 end: 591 if (!result) { 592 TS_TST_INFO_free(tst_info); 593 tst_info = NULL; 594 ERR_raise(ERR_LIB_TS, TS_R_TST_INFO_SETUP_ERROR); 595 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 596 "Error during TSTInfo " 597 "generation."); 598 } 599 GENERAL_NAME_free(tsa_name); 600 TS_ACCURACY_free(accuracy); 601 ASN1_GENERALIZEDTIME_free(asn1_time); 602 ASN1_INTEGER_free(serial); 603 604 return tst_info; 605} 606 607/* Processing the extensions of the request. */ 608static int ts_RESP_process_extensions(TS_RESP_CTX *ctx) 609{ 610 STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions; 611 int i; 612 int ok = 1; 613 614 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 615 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 616 /* 617 * The last argument was previously (void *)ctx->extension_cb, 618 * but ISO C doesn't permit converting a function pointer to void *. 619 * For lack of better information, I'm placing a NULL there instead. 620 * The callback can pick its own address out from the ctx anyway... 621 */ 622 ok = (*ctx->extension_cb) (ctx, ext, NULL); 623 } 624 625 return ok; 626} 627 628/* Functions for signing the TS_TST_INFO structure of the context. */ 629static int ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO *si, 630 const ESS_SIGNING_CERT *sc) 631{ 632 ASN1_STRING *seq = NULL; 633 int len = i2d_ESS_SIGNING_CERT(sc, NULL); 634 unsigned char *p, *pp = OPENSSL_malloc(len); 635 636 if (pp == NULL) 637 return 0; 638 639 p = pp; 640 i2d_ESS_SIGNING_CERT(sc, &p); 641 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { 642 ASN1_STRING_free(seq); 643 OPENSSL_free(pp); 644 return 0; 645 } 646 647 OPENSSL_free(pp); 648 return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificate, 649 V_ASN1_SEQUENCE, seq); 650} 651 652static int ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO *si, 653 const ESS_SIGNING_CERT_V2 *sc) 654{ 655 ASN1_STRING *seq = NULL; 656 int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL); 657 unsigned char *p, *pp = OPENSSL_malloc(len); 658 659 if (pp == NULL) 660 return 0; 661 662 p = pp; 663 i2d_ESS_SIGNING_CERT_V2(sc, &p); 664 if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) { 665 ASN1_STRING_free(seq); 666 OPENSSL_free(pp); 667 return 0; 668 } 669 670 OPENSSL_free(pp); 671 return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificateV2, 672 V_ASN1_SEQUENCE, seq); 673} 674 675static int ts_RESP_sign(TS_RESP_CTX *ctx) 676{ 677 int ret = 0; 678 PKCS7 *p7 = NULL; 679 PKCS7_SIGNER_INFO *si; 680 STACK_OF(X509) *certs; /* Certificates to include in sc. */ 681 ESS_SIGNING_CERT_V2 *sc2 = NULL; 682 ESS_SIGNING_CERT *sc = NULL; 683 ASN1_OBJECT *oid; 684 BIO *p7bio = NULL; 685 int i; 686 EVP_MD *signer_md = NULL; 687 688 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { 689 ERR_raise(ERR_LIB_TS, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 690 goto err; 691 } 692 693 if ((p7 = PKCS7_new_ex(ctx->libctx, ctx->propq)) == NULL) { 694 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 695 goto err; 696 } 697 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 698 goto err; 699 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 700 goto err; 701 702 if (ctx->request->cert_req) { 703 PKCS7_add_certificate(p7, ctx->signer_cert); 704 if (ctx->certs) { 705 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 706 X509 *cert = sk_X509_value(ctx->certs, i); 707 PKCS7_add_certificate(p7, cert); 708 } 709 } 710 } 711 712 if (ctx->signer_md == NULL) 713 signer_md = EVP_MD_fetch(ctx->libctx, "SHA256", ctx->propq); 714 else if (EVP_MD_get0_provider(ctx->signer_md) == NULL) 715 signer_md = EVP_MD_fetch(ctx->libctx, EVP_MD_get0_name(ctx->signer_md), 716 ctx->propq); 717 else 718 signer_md = (EVP_MD *)ctx->signer_md; 719 720 if ((si = PKCS7_add_signature(p7, ctx->signer_cert, 721 ctx->signer_key, signer_md)) == NULL) { 722 ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNATURE_ERROR); 723 goto err; 724 } 725 726 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 727 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 728 V_ASN1_OBJECT, oid)) { 729 ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 730 goto err; 731 } 732 733 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; 734 if (ctx->ess_cert_id_digest == NULL 735 || EVP_MD_is_a(ctx->ess_cert_id_digest, SN_sha1)) { 736 if ((sc = OSSL_ESS_signing_cert_new_init(ctx->signer_cert, 737 certs, 0)) == NULL) 738 goto err; 739 740 if (!ossl_ess_add1_signing_cert(si, sc)) { 741 ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_ERROR); 742 goto err; 743 } 744 } else { 745 sc2 = OSSL_ESS_signing_cert_v2_new_init(ctx->ess_cert_id_digest, 746 ctx->signer_cert, certs, 0); 747 if (sc2 == NULL) 748 goto err; 749 750 if (!ossl_ess_add1_signing_cert_v2(si, sc2)) { 751 ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR); 752 goto err; 753 } 754 } 755 756 if (!ts_TST_INFO_content_new(p7)) 757 goto err; 758 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) { 759 ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE); 760 goto err; 761 } 762 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { 763 ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN); 764 goto err; 765 } 766 if (!PKCS7_dataFinal(p7, p7bio)) { 767 ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN); 768 goto err; 769 } 770 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); 771 p7 = NULL; /* Ownership is lost. */ 772 ctx->tst_info = NULL; /* Ownership is lost. */ 773 774 ret = 1; 775 err: 776 if (signer_md != ctx->signer_md) 777 EVP_MD_free(signer_md); 778 779 if (!ret) 780 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 781 "Error during signature " 782 "generation."); 783 BIO_free_all(p7bio); 784 ESS_SIGNING_CERT_V2_free(sc2); 785 ESS_SIGNING_CERT_free(sc); 786 PKCS7_free(p7); 787 return ret; 788} 789 790static int ts_TST_INFO_content_new(PKCS7 *p7) 791{ 792 PKCS7 *ret = NULL; 793 ASN1_OCTET_STRING *octet_string = NULL; 794 795 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 796 if ((ret = PKCS7_new()) == NULL) 797 goto err; 798 if ((ret->d.other = ASN1_TYPE_new()) == NULL) 799 goto err; 800 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 801 if ((octet_string = ASN1_OCTET_STRING_new()) == NULL) 802 goto err; 803 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 804 octet_string = NULL; 805 806 /* Add encapsulated content to signed PKCS7 structure. */ 807 if (!PKCS7_set_content(p7, ret)) 808 goto err; 809 810 return 1; 811 err: 812 ASN1_OCTET_STRING_free(octet_string); 813 PKCS7_free(ret); 814 return 0; 815} 816 817static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision( 818 ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec, 819 unsigned precision) 820{ 821 time_t time_sec = (time_t)sec; 822 struct tm *tm = NULL, tm_result; 823 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 824 char *p = genTime_str; 825 char *p_end = genTime_str + sizeof(genTime_str); 826 827 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 828 goto err; 829 830 if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL) 831 goto err; 832 833 /* 834 * Put "genTime_str" in GeneralizedTime format. We work around the 835 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 836 * NOT include fractional seconds") and OpenSSL related functions to 837 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 838 * fraction-of-second details". 839 */ 840 p += BIO_snprintf(p, p_end - p, 841 "%04d%02d%02d%02d%02d%02d", 842 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 843 tm->tm_hour, tm->tm_min, tm->tm_sec); 844 if (precision > 0) { 845 BIO_snprintf(p, 2 + precision, ".%06ld", usec); 846 p += strlen(p); 847 848 /* 849 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the 850 * following restrictions for a DER-encoding, which OpenSSL 851 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 852 * support: "The encoding MUST terminate with a "Z" (which means 853 * "Zulu" time). The decimal point element, if present, MUST be the 854 * point option ".". The fractional-seconds elements, if present, 855 * MUST omit all trailing 0's; if the elements correspond to 0, they 856 * MUST be wholly omitted, and the decimal point element also MUST be 857 * omitted." 858 */ 859 /* 860 * Remove trailing zeros. The dot guarantees the exit condition of 861 * this loop even if all the digits are zero. 862 */ 863 while (*--p == '0') 864 continue; 865 if (*p != '.') 866 ++p; 867 } 868 *p++ = 'Z'; 869 *p++ = '\0'; 870 871 if (asn1_time == NULL 872 && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL) 873 goto err; 874 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 875 ASN1_GENERALIZEDTIME_free(asn1_time); 876 goto err; 877 } 878 return asn1_time; 879 880 err: 881 ERR_raise(ERR_LIB_TS, TS_R_COULD_NOT_SET_TIME); 882 return NULL; 883} 884 885int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md) 886{ 887 ctx->ess_cert_id_digest = md; 888 return 1; 889} 890