1/* crypto/ts/ts_resp_sign.c */ 2/* 3 * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project 4 * 2002. 5 */ 6/* ==================================================================== 7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60#include "cryptlib.h" 61 62#if defined(OPENSSL_SYS_UNIX) 63# include <sys/time.h> 64#endif 65 66#include <openssl/objects.h> 67#include <openssl/ts.h> 68#include <openssl/pkcs7.h> 69 70/* Private function declarations. */ 71 72static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *); 73static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec); 74static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *); 75 76static void TS_RESP_CTX_init(TS_RESP_CTX *ctx); 77static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx); 78static int TS_RESP_check_request(TS_RESP_CTX *ctx); 79static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx); 80static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 81 ASN1_OBJECT *policy); 82static int TS_RESP_process_extensions(TS_RESP_CTX *ctx); 83static int TS_RESP_sign(TS_RESP_CTX *ctx); 84 85static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 86 STACK_OF(X509) *certs); 87static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed); 88static int TS_TST_INFO_content_new(PKCS7 *p7); 89static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc); 90 91static ASN1_GENERALIZEDTIME 92*TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long, 93 unsigned); 94 95/* Default callbacks for response generation. */ 96 97static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data) 98{ 99 ASN1_INTEGER *serial = ASN1_INTEGER_new(); 100 if (!serial) 101 goto err; 102 if (!ASN1_INTEGER_set(serial, 1)) 103 goto err; 104 return serial; 105 err: 106 TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE); 107 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 108 "Error during serial number generation."); 109 return NULL; 110} 111 112#if defined(OPENSSL_SYS_UNIX) 113 114/* Use the gettimeofday function call. */ 115static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 116 long *sec, long *usec) 117{ 118 struct timeval tv; 119 if (gettimeofday(&tv, NULL) != 0) { 120 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 121 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 122 "Time is not available."); 123 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 124 return 0; 125 } 126 /* Return time to caller. */ 127 *sec = tv.tv_sec; 128 *usec = tv.tv_usec; 129 130 return 1; 131} 132 133#else 134 135/* Use the time function call that provides only seconds precision. */ 136static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 137 long *sec, long *usec) 138{ 139 time_t t; 140 if (time(&t) == (time_t)-1) { 141 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 142 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 143 "Time is not available."); 144 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 145 return 0; 146 } 147 /* Return time to caller, only second precision. */ 148 *sec = (long)t; 149 *usec = 0; 150 151 return 1; 152} 153 154#endif 155 156static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, 157 void *data) 158{ 159 /* No extensions are processed here. */ 160 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 161 "Unsupported extension."); 162 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 163 return 0; 164} 165 166/* TS_RESP_CTX management functions. */ 167 168TS_RESP_CTX *TS_RESP_CTX_new() 169{ 170 TS_RESP_CTX *ctx; 171 172 if (!(ctx = (TS_RESP_CTX *)OPENSSL_malloc(sizeof(TS_RESP_CTX)))) { 173 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE); 174 return NULL; 175 } 176 memset(ctx, 0, sizeof(TS_RESP_CTX)); 177 178 /* Setting default callbacks. */ 179 ctx->serial_cb = def_serial_cb; 180 ctx->time_cb = def_time_cb; 181 ctx->extension_cb = def_extension_cb; 182 183 return ctx; 184} 185 186void TS_RESP_CTX_free(TS_RESP_CTX *ctx) 187{ 188 if (!ctx) 189 return; 190 191 X509_free(ctx->signer_cert); 192 EVP_PKEY_free(ctx->signer_key); 193 sk_X509_pop_free(ctx->certs, X509_free); 194 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 195 ASN1_OBJECT_free(ctx->default_policy); 196 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 197 ASN1_INTEGER_free(ctx->seconds); 198 ASN1_INTEGER_free(ctx->millis); 199 ASN1_INTEGER_free(ctx->micros); 200 OPENSSL_free(ctx); 201} 202 203int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 204{ 205 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 206 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 207 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 208 return 0; 209 } 210 if (ctx->signer_cert) 211 X509_free(ctx->signer_cert); 212 ctx->signer_cert = signer; 213 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509); 214 return 1; 215} 216 217int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 218{ 219 if (ctx->signer_key) 220 EVP_PKEY_free(ctx->signer_key); 221 ctx->signer_key = key; 222 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY); 223 224 return 1; 225} 226 227int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy) 228{ 229 if (ctx->default_policy) 230 ASN1_OBJECT_free(ctx->default_policy); 231 if (!(ctx->default_policy = OBJ_dup(def_policy))) 232 goto err; 233 return 1; 234 err: 235 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE); 236 return 0; 237} 238 239int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 240{ 241 242 if (ctx->certs) { 243 sk_X509_pop_free(ctx->certs, X509_free); 244 ctx->certs = NULL; 245 } 246 if (!certs) 247 return 1; 248 if (!(ctx->certs = X509_chain_up_ref(certs))) { 249 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE); 250 return 0; 251 } 252 253 return 1; 254} 255 256int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy) 257{ 258 ASN1_OBJECT *copy = NULL; 259 260 /* Create new policy stack if necessary. */ 261 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 262 goto err; 263 if (!(copy = OBJ_dup(policy))) 264 goto err; 265 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 266 goto err; 267 268 return 1; 269 err: 270 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE); 271 ASN1_OBJECT_free(copy); 272 return 0; 273} 274 275int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 276{ 277 /* Create new md stack if necessary. */ 278 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 279 goto err; 280 /* Add the shared md, no copy needed. */ 281 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) 282 goto err; 283 284 return 1; 285 err: 286 TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE); 287 return 0; 288} 289 290#define TS_RESP_CTX_accuracy_free(ctx) \ 291 ASN1_INTEGER_free(ctx->seconds); \ 292 ctx->seconds = NULL; \ 293 ASN1_INTEGER_free(ctx->millis); \ 294 ctx->millis = NULL; \ 295 ASN1_INTEGER_free(ctx->micros); \ 296 ctx->micros = NULL; 297 298int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 299 int secs, int millis, int micros) 300{ 301 302 TS_RESP_CTX_accuracy_free(ctx); 303 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) 304 || !ASN1_INTEGER_set(ctx->seconds, secs))) 305 goto err; 306 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) 307 || !ASN1_INTEGER_set(ctx->millis, millis))) 308 goto err; 309 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) 310 || !ASN1_INTEGER_set(ctx->micros, micros))) 311 goto err; 312 313 return 1; 314 err: 315 TS_RESP_CTX_accuracy_free(ctx); 316 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE); 317 return 0; 318} 319 320void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 321{ 322 ctx->flags |= flags; 323} 324 325void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 326{ 327 ctx->serial_cb = cb; 328 ctx->serial_cb_data = data; 329} 330 331void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data) 332{ 333 ctx->time_cb = cb; 334 ctx->time_cb_data = data; 335} 336 337void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 338 TS_extension_cb cb, void *data) 339{ 340 ctx->extension_cb = cb; 341 ctx->extension_cb_data = data; 342} 343 344int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 345 int status, const char *text) 346{ 347 TS_STATUS_INFO *si = NULL; 348 ASN1_UTF8STRING *utf8_text = NULL; 349 int ret = 0; 350 351 if (!(si = TS_STATUS_INFO_new())) 352 goto err; 353 if (!ASN1_INTEGER_set(si->status, status)) 354 goto err; 355 if (text) { 356 if (!(utf8_text = ASN1_UTF8STRING_new()) 357 || !ASN1_STRING_set(utf8_text, text, strlen(text))) 358 goto err; 359 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null())) 360 goto err; 361 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 362 goto err; 363 utf8_text = NULL; /* Ownership is lost. */ 364 } 365 if (!TS_RESP_set_status_info(ctx->response, si)) 366 goto err; 367 ret = 1; 368 err: 369 if (!ret) 370 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE); 371 TS_STATUS_INFO_free(si); 372 ASN1_UTF8STRING_free(utf8_text); 373 return ret; 374} 375 376int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 377 int status, const char *text) 378{ 379 int ret = 1; 380 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 381 382 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 383 /* Status has not been set, set it now. */ 384 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 385 } 386 return ret; 387} 388 389int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 390{ 391 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 392 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new())) 393 goto err; 394 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 395 goto err; 396 return 1; 397 err: 398 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE); 399 return 0; 400} 401 402TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 403{ 404 return ctx->request; 405} 406 407TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 408{ 409 return ctx->tst_info; 410} 411 412int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, 413 unsigned precision) 414{ 415 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 416 return 0; 417 ctx->clock_precision_digits = precision; 418 return 1; 419} 420 421/* Main entry method of the response generation. */ 422TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 423{ 424 ASN1_OBJECT *policy; 425 TS_RESP *response; 426 int result = 0; 427 428 TS_RESP_CTX_init(ctx); 429 430 /* Creating the response object. */ 431 if (!(ctx->response = TS_RESP_new())) { 432 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE); 433 goto end; 434 } 435 436 /* Parsing DER request. */ 437 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) { 438 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 439 "Bad request format or " "system error."); 440 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 441 goto end; 442 } 443 444 /* Setting default status info. */ 445 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 446 goto end; 447 448 /* Checking the request format. */ 449 if (!TS_RESP_check_request(ctx)) 450 goto end; 451 452 /* Checking acceptable policies. */ 453 if (!(policy = TS_RESP_get_policy(ctx))) 454 goto end; 455 456 /* Creating the TS_TST_INFO object. */ 457 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy))) 458 goto end; 459 460 /* Processing extensions. */ 461 if (!TS_RESP_process_extensions(ctx)) 462 goto end; 463 464 /* Generating the signature. */ 465 if (!TS_RESP_sign(ctx)) 466 goto end; 467 468 /* Everything was successful. */ 469 result = 1; 470 end: 471 if (!result) { 472 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR); 473 if (ctx->response != NULL) { 474 if (TS_RESP_CTX_set_status_info_cond(ctx, 475 TS_STATUS_REJECTION, 476 "Error during response " 477 "generation.") == 0) { 478 TS_RESP_free(ctx->response); 479 ctx->response = NULL; 480 } 481 } 482 } 483 response = ctx->response; 484 ctx->response = NULL; /* Ownership will be returned to caller. */ 485 TS_RESP_CTX_cleanup(ctx); 486 return response; 487} 488 489/* Initializes the variable part of the context. */ 490static void TS_RESP_CTX_init(TS_RESP_CTX *ctx) 491{ 492 ctx->request = NULL; 493 ctx->response = NULL; 494 ctx->tst_info = NULL; 495} 496 497/* Cleans up the variable part of the context. */ 498static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 499{ 500 TS_REQ_free(ctx->request); 501 ctx->request = NULL; 502 TS_RESP_free(ctx->response); 503 ctx->response = NULL; 504 TS_TST_INFO_free(ctx->tst_info); 505 ctx->tst_info = NULL; 506} 507 508/* Checks the format and content of the request. */ 509static int TS_RESP_check_request(TS_RESP_CTX *ctx) 510{ 511 TS_REQ *request = ctx->request; 512 TS_MSG_IMPRINT *msg_imprint; 513 X509_ALGOR *md_alg; 514 int md_alg_id; 515 const ASN1_OCTET_STRING *digest; 516 EVP_MD *md = NULL; 517 int i; 518 519 /* Checking request version. */ 520 if (TS_REQ_get_version(request) != 1) { 521 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 522 "Bad request version."); 523 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 524 return 0; 525 } 526 527 /* Checking message digest algorithm. */ 528 msg_imprint = TS_REQ_get_msg_imprint(request); 529 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint); 530 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 531 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 532 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 533 if (md_alg_id == EVP_MD_type(current_md)) 534 md = current_md; 535 } 536 if (!md) { 537 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 538 "Message digest algorithm is " 539 "not supported."); 540 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 541 return 0; 542 } 543 544 /* No message digest takes parameter. */ 545 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 546 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 547 "Superfluous message digest " 548 "parameter."); 549 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 550 return 0; 551 } 552 /* Checking message digest size. */ 553 digest = TS_MSG_IMPRINT_get_msg(msg_imprint); 554 if (digest->length != EVP_MD_size(md)) { 555 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 556 "Bad message digest."); 557 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 558 return 0; 559 } 560 561 return 1; 562} 563 564/* Returns the TSA policy based on the requested and acceptable policies. */ 565static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx) 566{ 567 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request); 568 ASN1_OBJECT *policy = NULL; 569 int i; 570 571 if (ctx->default_policy == NULL) { 572 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER); 573 return NULL; 574 } 575 /* 576 * Return the default policy if none is requested or the default is 577 * requested. 578 */ 579 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 580 policy = ctx->default_policy; 581 582 /* Check if the policy is acceptable. */ 583 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 584 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 585 if (!OBJ_cmp(requested, current)) 586 policy = current; 587 } 588 if (!policy) { 589 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY); 590 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 591 "Requested policy is not " "supported."); 592 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 593 } 594 return policy; 595} 596 597/* Creates the TS_TST_INFO object based on the settings of the context. */ 598static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 599 ASN1_OBJECT *policy) 600{ 601 int result = 0; 602 TS_TST_INFO *tst_info = NULL; 603 ASN1_INTEGER *serial = NULL; 604 ASN1_GENERALIZEDTIME *asn1_time = NULL; 605 long sec, usec; 606 TS_ACCURACY *accuracy = NULL; 607 const ASN1_INTEGER *nonce; 608 GENERAL_NAME *tsa_name = NULL; 609 610 if (!(tst_info = TS_TST_INFO_new())) 611 goto end; 612 if (!TS_TST_INFO_set_version(tst_info, 1)) 613 goto end; 614 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 615 goto end; 616 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 617 goto end; 618 if (!(serial = (*ctx->serial_cb) (ctx, ctx->serial_cb_data)) 619 || !TS_TST_INFO_set_serial(tst_info, serial)) 620 goto end; 621 if (!(*ctx->time_cb) (ctx, ctx->time_cb_data, &sec, &usec) 622 || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, 623 sec, usec, 624 ctx->clock_precision_digits)) 625 || !TS_TST_INFO_set_time(tst_info, asn1_time)) 626 goto end; 627 628 /* Setting accuracy if needed. */ 629 if ((ctx->seconds || ctx->millis || ctx->micros) 630 && !(accuracy = TS_ACCURACY_new())) 631 goto end; 632 633 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 634 goto end; 635 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 636 goto end; 637 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 638 goto end; 639 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 640 goto end; 641 642 /* Setting ordering. */ 643 if ((ctx->flags & TS_ORDERING) 644 && !TS_TST_INFO_set_ordering(tst_info, 1)) 645 goto end; 646 647 /* Setting nonce if needed. */ 648 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL 649 && !TS_TST_INFO_set_nonce(tst_info, nonce)) 650 goto end; 651 652 /* Setting TSA name to subject of signer certificate. */ 653 if (ctx->flags & TS_TSA_NAME) { 654 if (!(tsa_name = GENERAL_NAME_new())) 655 goto end; 656 tsa_name->type = GEN_DIRNAME; 657 tsa_name->d.dirn = 658 X509_NAME_dup(ctx->signer_cert->cert_info->subject); 659 if (!tsa_name->d.dirn) 660 goto end; 661 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 662 goto end; 663 } 664 665 result = 1; 666 end: 667 if (!result) { 668 TS_TST_INFO_free(tst_info); 669 tst_info = NULL; 670 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR); 671 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 672 "Error during TSTInfo " 673 "generation."); 674 } 675 GENERAL_NAME_free(tsa_name); 676 TS_ACCURACY_free(accuracy); 677 ASN1_GENERALIZEDTIME_free(asn1_time); 678 ASN1_INTEGER_free(serial); 679 680 return tst_info; 681} 682 683/* Processing the extensions of the request. */ 684static int TS_RESP_process_extensions(TS_RESP_CTX *ctx) 685{ 686 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request); 687 int i; 688 int ok = 1; 689 690 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 691 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 692 /* 693 * XXXXX The last argument was previously (void *)ctx->extension_cb, 694 * but ISO C doesn't permit converting a function pointer to void *. 695 * For lack of better information, I'm placing a NULL there instead. 696 * The callback can pick its own address out from the ctx anyway... 697 */ 698 ok = (*ctx->extension_cb) (ctx, ext, NULL); 699 } 700 701 return ok; 702} 703 704/* Functions for signing the TS_TST_INFO structure of the context. */ 705static int TS_RESP_sign(TS_RESP_CTX *ctx) 706{ 707 int ret = 0; 708 PKCS7 *p7 = NULL; 709 PKCS7_SIGNER_INFO *si; 710 STACK_OF(X509) *certs; /* Certificates to include in sc. */ 711 ESS_SIGNING_CERT *sc = NULL; 712 ASN1_OBJECT *oid; 713 BIO *p7bio = NULL; 714 int i; 715 716 /* Check if signcert and pkey match. */ 717 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { 718 TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 719 goto err; 720 } 721 722 /* Create a new PKCS7 signed object. */ 723 if (!(p7 = PKCS7_new())) { 724 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 725 goto err; 726 } 727 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 728 goto err; 729 730 /* Force SignedData version to be 3 instead of the default 1. */ 731 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 732 goto err; 733 734 /* Add signer certificate and optional certificate chain. */ 735 if (TS_REQ_get_cert_req(ctx->request)) { 736 PKCS7_add_certificate(p7, ctx->signer_cert); 737 if (ctx->certs) { 738 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 739 X509 *cert = sk_X509_value(ctx->certs, i); 740 PKCS7_add_certificate(p7, cert); 741 } 742 } 743 } 744 745 /* Add a new signer info. */ 746 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert, 747 ctx->signer_key, EVP_sha1()))) { 748 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR); 749 goto err; 750 } 751 752 /* Add content type signed attribute to the signer info. */ 753 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 754 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 755 V_ASN1_OBJECT, oid)) { 756 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 757 goto err; 758 } 759 760 /* 761 * Create the ESS SigningCertificate attribute which contains the signer 762 * certificate id and optionally the certificate chain. 763 */ 764 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; 765 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs))) 766 goto err; 767 768 /* Add SigningCertificate signed attribute to the signer info. */ 769 if (!ESS_add_signing_cert(si, sc)) { 770 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR); 771 goto err; 772 } 773 774 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */ 775 if (!TS_TST_INFO_content_new(p7)) 776 goto err; 777 778 /* Add the DER encoded tst_info to the PKCS7 structure. */ 779 if (!(p7bio = PKCS7_dataInit(p7, NULL))) { 780 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 781 goto err; 782 } 783 784 /* Convert tst_info to DER. */ 785 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { 786 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN); 787 goto err; 788 } 789 790 /* Create the signature and add it to the signer info. */ 791 if (!PKCS7_dataFinal(p7, p7bio)) { 792 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN); 793 goto err; 794 } 795 796 /* Set new PKCS7 and TST_INFO objects. */ 797 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); 798 p7 = NULL; /* Ownership is lost. */ 799 ctx->tst_info = NULL; /* Ownership is lost. */ 800 801 ret = 1; 802 err: 803 if (!ret) 804 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 805 "Error during signature " 806 "generation."); 807 BIO_free_all(p7bio); 808 ESS_SIGNING_CERT_free(sc); 809 PKCS7_free(p7); 810 return ret; 811} 812 813static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 814 STACK_OF(X509) *certs) 815{ 816 ESS_CERT_ID *cid; 817 ESS_SIGNING_CERT *sc = NULL; 818 int i; 819 820 /* Creating the ESS_CERT_ID stack. */ 821 if (!(sc = ESS_SIGNING_CERT_new())) 822 goto err; 823 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null())) 824 goto err; 825 826 /* Adding the signing certificate id. */ 827 if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) 828 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 829 goto err; 830 /* Adding the certificate chain ids. */ 831 for (i = 0; i < sk_X509_num(certs); ++i) { 832 X509 *cert = sk_X509_value(certs, i); 833 if (!(cid = ESS_CERT_ID_new_init(cert, 1)) 834 || !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 835 goto err; 836 } 837 838 return sc; 839 err: 840 ESS_SIGNING_CERT_free(sc); 841 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE); 842 return NULL; 843} 844 845static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed) 846{ 847 ESS_CERT_ID *cid = NULL; 848 GENERAL_NAME *name = NULL; 849 850 /* Recompute SHA1 hash of certificate if necessary (side effect). */ 851 X509_check_purpose(cert, -1, 0); 852 853 if (!(cid = ESS_CERT_ID_new())) 854 goto err; 855 if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash, 856 sizeof(cert->sha1_hash))) 857 goto err; 858 859 /* Setting the issuer/serial if requested. */ 860 if (issuer_needed) { 861 /* Creating issuer/serial structure. */ 862 if (!cid->issuer_serial 863 && !(cid->issuer_serial = ESS_ISSUER_SERIAL_new())) 864 goto err; 865 /* Creating general name from the certificate issuer. */ 866 if (!(name = GENERAL_NAME_new())) 867 goto err; 868 name->type = GEN_DIRNAME; 869 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer))) 870 goto err; 871 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 872 goto err; 873 name = NULL; /* Ownership is lost. */ 874 /* Setting the serial number. */ 875 ASN1_INTEGER_free(cid->issuer_serial->serial); 876 if (!(cid->issuer_serial->serial = 877 ASN1_INTEGER_dup(cert->cert_info->serialNumber))) 878 goto err; 879 } 880 881 return cid; 882 err: 883 GENERAL_NAME_free(name); 884 ESS_CERT_ID_free(cid); 885 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE); 886 return NULL; 887} 888 889static int TS_TST_INFO_content_new(PKCS7 *p7) 890{ 891 PKCS7 *ret = NULL; 892 ASN1_OCTET_STRING *octet_string = NULL; 893 894 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 895 if (!(ret = PKCS7_new())) 896 goto err; 897 if (!(ret->d.other = ASN1_TYPE_new())) 898 goto err; 899 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 900 if (!(octet_string = ASN1_OCTET_STRING_new())) 901 goto err; 902 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 903 octet_string = NULL; 904 905 /* Add encapsulated content to signed PKCS7 structure. */ 906 if (!PKCS7_set_content(p7, ret)) 907 goto err; 908 909 return 1; 910 err: 911 ASN1_OCTET_STRING_free(octet_string); 912 PKCS7_free(ret); 913 return 0; 914} 915 916static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 917{ 918 ASN1_STRING *seq = NULL; 919 unsigned char *p, *pp = NULL; 920 int len; 921 922 len = i2d_ESS_SIGNING_CERT(sc, NULL); 923 if (!(pp = (unsigned char *)OPENSSL_malloc(len))) { 924 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 925 goto err; 926 } 927 p = pp; 928 i2d_ESS_SIGNING_CERT(sc, &p); 929 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) { 930 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 931 goto err; 932 } 933 OPENSSL_free(pp); 934 pp = NULL; 935 return PKCS7_add_signed_attribute(si, 936 NID_id_smime_aa_signingCertificate, 937 V_ASN1_SEQUENCE, seq); 938 err: 939 ASN1_STRING_free(seq); 940 OPENSSL_free(pp); 941 942 return 0; 943} 944 945static ASN1_GENERALIZEDTIME 946*TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 947 long sec, long usec, unsigned precision) 948{ 949 time_t time_sec = (time_t)sec; 950 struct tm *tm = NULL; 951 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 952 char *p = genTime_str; 953 char *p_end = genTime_str + sizeof(genTime_str); 954 955 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 956 goto err; 957 958 if (!(tm = gmtime(&time_sec))) 959 goto err; 960 961 /* 962 * Put "genTime_str" in GeneralizedTime format. We work around the 963 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 964 * NOT include fractional seconds") and OpenSSL related functions to 965 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 966 * fraction-of-second details". 967 */ 968 p += BIO_snprintf(p, p_end - p, 969 "%04d%02d%02d%02d%02d%02d", 970 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 971 tm->tm_hour, tm->tm_min, tm->tm_sec); 972 if (precision > 0) { 973 /* Add fraction of seconds (leave space for dot and null). */ 974 BIO_snprintf(p, 2 + precision, ".%06ld", usec); 975 /* 976 * We cannot use the snprintf return value, because it might have 977 * been truncated. 978 */ 979 p += strlen(p); 980 981 /* 982 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the 983 * following restrictions for a DER-encoding, which OpenSSL 984 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 985 * support: "The encoding MUST terminate with a "Z" (which means 986 * "Zulu" time). The decimal point element, if present, MUST be the 987 * point option ".". The fractional-seconds elements, if present, 988 * MUST omit all trailing 0's; if the elements correspond to 0, they 989 * MUST be wholly omitted, and the decimal point element also MUST be 990 * omitted." 991 */ 992 /* 993 * Remove trailing zeros. The dot guarantees the exit condition of 994 * this loop even if all the digits are zero. 995 */ 996 while (*--p == '0') 997 /* 998 * empty 999 */ ; 1000 /* p points to either the dot or the last non-zero digit. */ 1001 if (*p != '.') 1002 ++p; 1003 } 1004 /* Add the trailing Z and the terminating null. */ 1005 *p++ = 'Z'; 1006 *p++ = '\0'; 1007 1008 /* Now call OpenSSL to check and set our genTime value */ 1009 if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new())) 1010 goto err; 1011 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1012 ASN1_GENERALIZEDTIME_free(asn1_time); 1013 goto err; 1014 } 1015 1016 return asn1_time; 1017 err: 1018 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME); 1019 return NULL; 1020} 1021