1 /* $OpenBSD: ts_rsp_sign.c,v 1.26 2021/12/12 21:30:14 tb Exp $ */ 2 /* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL 3 * project 2002. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <sys/time.h> 60 61 #include <string.h> 62 63 #include <openssl/err.h> 64 #include <openssl/objects.h> 65 #include <openssl/pkcs7.h> 66 #include <openssl/ts.h> 67 68 #include "evp_locl.h" 69 #include "x509_lcl.h" 70 71 /* Private function declarations. */ 72 73 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *); 74 static int def_time_cb(struct TS_resp_ctx *, void *, time_t *sec, long *usec); 75 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *); 76 77 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx); 78 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx); 79 static int TS_RESP_check_request(TS_RESP_CTX *ctx); 80 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx); 81 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 82 ASN1_OBJECT *policy); 83 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx); 84 static int TS_RESP_sign(TS_RESP_CTX *ctx); 85 86 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 87 STACK_OF(X509) *certs); 88 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed); 89 static int TS_TST_INFO_content_new(PKCS7 *p7); 90 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc); 91 92 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision( 93 ASN1_GENERALIZEDTIME *, time_t, long, unsigned); 94 95 /* Default callbacks for response generation. */ 96 97 static ASN1_INTEGER * 98 def_serial_cb(struct TS_resp_ctx *ctx, void *data) 99 { 100 ASN1_INTEGER *serial = ASN1_INTEGER_new(); 101 102 if (!serial) 103 goto err; 104 if (!ASN1_INTEGER_set(serial, 1)) 105 goto err; 106 return serial; 107 108 err: 109 TSerror(ERR_R_MALLOC_FAILURE); 110 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 111 "Error during serial number generation."); 112 return NULL; 113 } 114 115 /* Use the gettimeofday function call. */ 116 static int 117 def_time_cb(struct TS_resp_ctx *ctx, void *data, time_t *sec, long *usec) 118 { 119 struct timeval tv; 120 121 if (gettimeofday(&tv, NULL) != 0) { 122 TSerror(TS_R_TIME_SYSCALL_ERROR); 123 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 124 "Time is not available."); 125 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 126 return 0; 127 } 128 /* Return time to caller. */ 129 *sec = tv.tv_sec; 130 *usec = tv.tv_usec; 131 132 return 1; 133 } 134 135 static int 136 def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, void *data) 137 { 138 /* No extensions are processed here. */ 139 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 140 "Unsupported extension."); 141 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 142 return 0; 143 } 144 145 /* TS_RESP_CTX management functions. */ 146 147 TS_RESP_CTX * 148 TS_RESP_CTX_new(void) 149 { 150 TS_RESP_CTX *ctx; 151 152 if (!(ctx = calloc(1, sizeof(TS_RESP_CTX)))) { 153 TSerror(ERR_R_MALLOC_FAILURE); 154 return NULL; 155 } 156 157 /* Setting default callbacks. */ 158 ctx->serial_cb = def_serial_cb; 159 ctx->time_cb = def_time_cb; 160 ctx->extension_cb = def_extension_cb; 161 162 return ctx; 163 } 164 165 void 166 TS_RESP_CTX_free(TS_RESP_CTX *ctx) 167 { 168 if (!ctx) 169 return; 170 171 X509_free(ctx->signer_cert); 172 EVP_PKEY_free(ctx->signer_key); 173 sk_X509_pop_free(ctx->certs, X509_free); 174 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 175 ASN1_OBJECT_free(ctx->default_policy); 176 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 177 ASN1_INTEGER_free(ctx->seconds); 178 ASN1_INTEGER_free(ctx->millis); 179 ASN1_INTEGER_free(ctx->micros); 180 free(ctx); 181 } 182 183 int 184 TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 185 { 186 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 187 TSerror(TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 188 return 0; 189 } 190 X509_free(ctx->signer_cert); 191 ctx->signer_cert = signer; 192 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509); 193 return 1; 194 } 195 196 int 197 TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 198 { 199 EVP_PKEY_free(ctx->signer_key); 200 ctx->signer_key = key; 201 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY); 202 203 return 1; 204 } 205 206 int 207 TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy) 208 { 209 if (ctx->default_policy) 210 ASN1_OBJECT_free(ctx->default_policy); 211 if (!(ctx->default_policy = OBJ_dup(def_policy))) 212 goto err; 213 return 1; 214 215 err: 216 TSerror(ERR_R_MALLOC_FAILURE); 217 return 0; 218 } 219 220 int 221 TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 222 { 223 int i; 224 225 if (ctx->certs) { 226 sk_X509_pop_free(ctx->certs, X509_free); 227 ctx->certs = NULL; 228 } 229 if (!certs) 230 return 1; 231 if (!(ctx->certs = sk_X509_dup(certs))) { 232 TSerror(ERR_R_MALLOC_FAILURE); 233 return 0; 234 } 235 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 236 X509 *cert = sk_X509_value(ctx->certs, i); 237 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509); 238 } 239 240 return 1; 241 } 242 243 int 244 TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy) 245 { 246 ASN1_OBJECT *copy = NULL; 247 248 /* Create new policy stack if necessary. */ 249 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 250 goto err; 251 if (!(copy = OBJ_dup(policy))) 252 goto err; 253 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 254 goto err; 255 256 return 1; 257 258 err: 259 TSerror(ERR_R_MALLOC_FAILURE); 260 ASN1_OBJECT_free(copy); 261 return 0; 262 } 263 264 int 265 TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 266 { 267 /* Create new md stack if necessary. */ 268 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 269 goto err; 270 /* Add the shared md, no copy needed. */ 271 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) 272 goto err; 273 274 return 1; 275 276 err: 277 TSerror(ERR_R_MALLOC_FAILURE); 278 return 0; 279 } 280 281 #define TS_RESP_CTX_accuracy_free(ctx) \ 282 ASN1_INTEGER_free(ctx->seconds); \ 283 ctx->seconds = NULL; \ 284 ASN1_INTEGER_free(ctx->millis); \ 285 ctx->millis = NULL; \ 286 ASN1_INTEGER_free(ctx->micros); \ 287 ctx->micros = NULL; 288 289 int 290 TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, int secs, int millis, int micros) 291 { 292 TS_RESP_CTX_accuracy_free(ctx); 293 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) || 294 !ASN1_INTEGER_set(ctx->seconds, secs))) 295 goto err; 296 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) || 297 !ASN1_INTEGER_set(ctx->millis, millis))) 298 goto err; 299 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) || 300 !ASN1_INTEGER_set(ctx->micros, micros))) 301 goto err; 302 303 return 1; 304 305 err: 306 TS_RESP_CTX_accuracy_free(ctx); 307 TSerror(ERR_R_MALLOC_FAILURE); 308 return 0; 309 } 310 311 void 312 TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 313 { 314 ctx->flags |= flags; 315 } 316 317 void 318 TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 319 { 320 ctx->serial_cb = cb; 321 ctx->serial_cb_data = data; 322 } 323 324 void 325 TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, TS_extension_cb cb, void *data) 326 { 327 ctx->extension_cb = cb; 328 ctx->extension_cb_data = data; 329 } 330 331 int 332 TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, int status, const char *text) 333 { 334 TS_STATUS_INFO *si = NULL; 335 ASN1_UTF8STRING *utf8_text = NULL; 336 int ret = 0; 337 338 if (!(si = TS_STATUS_INFO_new())) 339 goto err; 340 if (!ASN1_INTEGER_set(si->status, status)) 341 goto err; 342 if (text) { 343 if (!(utf8_text = ASN1_UTF8STRING_new()) || 344 !ASN1_STRING_set(utf8_text, text, strlen(text))) 345 goto err; 346 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null())) 347 goto err; 348 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 349 goto err; 350 utf8_text = NULL; /* Ownership is lost. */ 351 } 352 if (!TS_RESP_set_status_info(ctx->response, si)) 353 goto err; 354 ret = 1; 355 356 err: 357 if (!ret) 358 TSerror(ERR_R_MALLOC_FAILURE); 359 TS_STATUS_INFO_free(si); 360 ASN1_UTF8STRING_free(utf8_text); 361 return ret; 362 } 363 364 int 365 TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, int status, const char *text) 366 { 367 int ret = 1; 368 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 369 370 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 371 /* Status has not been set, set it now. */ 372 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 373 } 374 return ret; 375 } 376 377 int 378 TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 379 { 380 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 381 382 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new())) 383 goto err; 384 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 385 goto err; 386 return 1; 387 388 err: 389 TSerror(ERR_R_MALLOC_FAILURE); 390 return 0; 391 } 392 393 TS_REQ * 394 TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 395 { 396 return ctx->request; 397 } 398 399 TS_TST_INFO * 400 TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 401 { 402 return ctx->tst_info; 403 } 404 405 int 406 TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision) 407 { 408 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 409 return 0; 410 ctx->clock_precision_digits = precision; 411 return 1; 412 } 413 414 /* Main entry method of the response generation. */ 415 TS_RESP * 416 TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 417 { 418 ASN1_OBJECT *policy; 419 TS_RESP *response; 420 int result = 0; 421 422 TS_RESP_CTX_init(ctx); 423 424 /* Creating the response object. */ 425 if (!(ctx->response = TS_RESP_new())) { 426 TSerror(ERR_R_MALLOC_FAILURE); 427 goto end; 428 } 429 430 /* Parsing DER request. */ 431 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) { 432 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 433 "Bad request format or " 434 "system error."); 435 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 436 goto end; 437 } 438 439 /* Setting default status info. */ 440 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 441 goto end; 442 443 /* Checking the request format. */ 444 if (!TS_RESP_check_request(ctx)) 445 goto end; 446 447 /* Checking acceptable policies. */ 448 if (!(policy = TS_RESP_get_policy(ctx))) 449 goto end; 450 451 /* Creating the TS_TST_INFO object. */ 452 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy))) 453 goto end; 454 455 /* Processing extensions. */ 456 if (!TS_RESP_process_extensions(ctx)) 457 goto end; 458 459 /* Generating the signature. */ 460 if (!TS_RESP_sign(ctx)) 461 goto end; 462 463 /* Everything was successful. */ 464 result = 1; 465 466 end: 467 if (!result) { 468 TSerror(TS_R_RESPONSE_SETUP_ERROR); 469 if (ctx->response != NULL) { 470 if (TS_RESP_CTX_set_status_info_cond(ctx, 471 TS_STATUS_REJECTION, "Error during response " 472 "generation.") == 0) { 473 TS_RESP_free(ctx->response); 474 ctx->response = NULL; 475 } 476 } 477 } 478 response = ctx->response; 479 ctx->response = NULL; /* Ownership will be returned to caller. */ 480 TS_RESP_CTX_cleanup(ctx); 481 return response; 482 } 483 484 /* Initializes the variable part of the context. */ 485 static void 486 TS_RESP_CTX_init(TS_RESP_CTX *ctx) 487 { 488 ctx->request = NULL; 489 ctx->response = NULL; 490 ctx->tst_info = NULL; 491 } 492 493 /* Cleans up the variable part of the context. */ 494 static void 495 TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 496 { 497 TS_REQ_free(ctx->request); 498 ctx->request = NULL; 499 TS_RESP_free(ctx->response); 500 ctx->response = NULL; 501 TS_TST_INFO_free(ctx->tst_info); 502 ctx->tst_info = NULL; 503 } 504 505 /* Checks the format and content of the request. */ 506 static int 507 TS_RESP_check_request(TS_RESP_CTX *ctx) 508 { 509 TS_REQ *request = ctx->request; 510 TS_MSG_IMPRINT *msg_imprint; 511 X509_ALGOR *md_alg; 512 int md_alg_id; 513 const ASN1_OCTET_STRING *digest; 514 EVP_MD *md = NULL; 515 int i; 516 517 /* Checking request version. */ 518 if (TS_REQ_get_version(request) != 1) { 519 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 520 "Bad request version."); 521 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 522 return 0; 523 } 524 525 /* Checking message digest algorithm. */ 526 msg_imprint = TS_REQ_get_msg_imprint(request); 527 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint); 528 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 529 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 530 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 531 if (md_alg_id == EVP_MD_type(current_md)) 532 md = current_md; 533 } 534 if (!md) { 535 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 536 "Message digest algorithm is " 537 "not supported."); 538 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 539 return 0; 540 } 541 542 /* No message digest takes parameter. */ 543 if (md_alg->parameter && 544 ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 545 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 546 "Superfluous message digest " 547 "parameter."); 548 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 549 return 0; 550 } 551 /* Checking message digest size. */ 552 digest = TS_MSG_IMPRINT_get_msg(msg_imprint); 553 if (digest->length != EVP_MD_size(md)) { 554 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 555 "Bad message digest."); 556 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 557 return 0; 558 } 559 560 return 1; 561 } 562 563 /* Returns the TSA policy based on the requested and acceptable policies. */ 564 static ASN1_OBJECT * 565 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 TSerror(TS_R_INVALID_NULL_POINTER); 573 return NULL; 574 } 575 /* Return the default policy if none is requested or the default is 576 requested. */ 577 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 578 policy = ctx->default_policy; 579 580 /* Check if the policy is acceptable. */ 581 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 582 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 583 if (!OBJ_cmp(requested, current)) 584 policy = current; 585 } 586 if (!policy) { 587 TSerror(TS_R_UNACCEPTABLE_POLICY); 588 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 589 "Requested policy is not " 590 "supported."); 591 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 592 } 593 return policy; 594 } 595 596 /* Creates the TS_TST_INFO object based on the settings of the context. */ 597 static TS_TST_INFO * 598 TS_RESP_create_tst_info(TS_RESP_CTX *ctx, ASN1_OBJECT *policy) 599 { 600 int result = 0; 601 TS_TST_INFO *tst_info = NULL; 602 ASN1_INTEGER *serial = NULL; 603 ASN1_GENERALIZEDTIME *asn1_time = NULL; 604 time_t sec; 605 long 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, sec, usec, 623 ctx->clock_precision_digits)) || 624 !TS_TST_INFO_set_time(tst_info, asn1_time)) 625 goto end; 626 627 /* Setting accuracy if needed. */ 628 if ((ctx->seconds || ctx->millis || ctx->micros) && 629 !(accuracy = TS_ACCURACY_new())) 630 goto end; 631 632 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 633 goto end; 634 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 635 goto end; 636 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 637 goto end; 638 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 639 goto end; 640 641 /* Setting ordering. */ 642 if ((ctx->flags & TS_ORDERING) && 643 !TS_TST_INFO_set_ordering(tst_info, 1)) 644 goto end; 645 646 /* Setting nonce if needed. */ 647 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL && 648 !TS_TST_INFO_set_nonce(tst_info, nonce)) 649 goto end; 650 651 /* Setting TSA name to subject of signer certificate. */ 652 if (ctx->flags & TS_TSA_NAME) { 653 if (!(tsa_name = GENERAL_NAME_new())) 654 goto end; 655 tsa_name->type = GEN_DIRNAME; 656 tsa_name->d.dirn = 657 X509_NAME_dup(ctx->signer_cert->cert_info->subject); 658 if (!tsa_name->d.dirn) 659 goto end; 660 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 661 goto end; 662 } 663 664 result = 1; 665 666 end: 667 if (!result) { 668 TS_TST_INFO_free(tst_info); 669 tst_info = NULL; 670 TSerror(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. */ 684 static int 685 TS_RESP_process_extensions(TS_RESP_CTX *ctx) 686 { 687 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request); 688 int i; 689 int ok = 1; 690 691 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 692 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 693 /* XXXXX The last argument was previously 694 (void *)ctx->extension_cb, but ISO C doesn't permit 695 converting a function pointer to void *. For lack of 696 better information, I'm placing a NULL there instead. 697 The callback can pick its own address out from the ctx 698 anyway... 699 */ 700 ok = (*ctx->extension_cb)(ctx, ext, NULL); 701 } 702 703 return ok; 704 } 705 706 /* Functions for signing the TS_TST_INFO structure of the context. */ 707 static int 708 TS_RESP_sign(TS_RESP_CTX *ctx) 709 { 710 int ret = 0; 711 PKCS7 *p7 = NULL; 712 PKCS7_SIGNER_INFO *si; 713 STACK_OF(X509) *certs; /* Certificates to include in sc. */ 714 ESS_SIGNING_CERT *sc = NULL; 715 ASN1_OBJECT *oid; 716 BIO *p7bio = NULL; 717 int i; 718 719 /* Check if signcert and pkey match. */ 720 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { 721 TSerror(TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 722 goto err; 723 } 724 725 /* Create a new PKCS7 signed object. */ 726 if (!(p7 = PKCS7_new())) { 727 TSerror(ERR_R_MALLOC_FAILURE); 728 goto err; 729 } 730 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 731 goto err; 732 733 /* Force SignedData version to be 3 instead of the default 1. */ 734 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 735 goto err; 736 737 /* Add signer certificate and optional certificate chain. */ 738 if (TS_REQ_get_cert_req(ctx->request)) { 739 PKCS7_add_certificate(p7, ctx->signer_cert); 740 if (ctx->certs) { 741 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 742 X509 *cert = sk_X509_value(ctx->certs, i); 743 PKCS7_add_certificate(p7, cert); 744 } 745 } 746 } 747 748 /* Add a new signer info. */ 749 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert, 750 ctx->signer_key, EVP_sha1()))) { 751 TSerror(TS_R_PKCS7_ADD_SIGNATURE_ERROR); 752 goto err; 753 } 754 755 /* Add content type signed attribute to the signer info. */ 756 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 757 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 758 V_ASN1_OBJECT, oid)) { 759 TSerror(TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 760 goto err; 761 } 762 763 /* Create the ESS SigningCertificate attribute which contains 764 the signer certificate id and optionally the certificate chain. */ 765 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; 766 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs))) 767 goto err; 768 769 /* Add SigningCertificate signed attribute to the signer info. */ 770 if (!ESS_add_signing_cert(si, sc)) { 771 TSerror(TS_R_ESS_ADD_SIGNING_CERT_ERROR); 772 goto err; 773 } 774 775 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */ 776 if (!TS_TST_INFO_content_new(p7)) 777 goto err; 778 779 /* Add the DER encoded tst_info to the PKCS7 structure. */ 780 if (!(p7bio = PKCS7_dataInit(p7, NULL))) { 781 TSerror(ERR_R_MALLOC_FAILURE); 782 goto err; 783 } 784 785 /* Convert tst_info to DER. */ 786 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { 787 TSerror(TS_R_TS_DATASIGN); 788 goto err; 789 } 790 791 /* Create the signature and add it to the signer info. */ 792 if (!PKCS7_dataFinal(p7, p7bio)) { 793 TSerror(TS_R_TS_DATASIGN); 794 goto err; 795 } 796 797 /* Set new PKCS7 and TST_INFO objects. */ 798 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); 799 p7 = NULL; /* Ownership is lost. */ 800 ctx->tst_info = NULL; /* Ownership is lost. */ 801 802 ret = 1; 803 804 err: 805 if (!ret) 806 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 807 "Error during signature " 808 "generation."); 809 BIO_free_all(p7bio); 810 ESS_SIGNING_CERT_free(sc); 811 PKCS7_free(p7); 812 return ret; 813 } 814 815 static ESS_SIGNING_CERT * 816 ESS_SIGNING_CERT_new_init(X509 *signcert, STACK_OF(X509) *certs) 817 { 818 ESS_CERT_ID *cid; 819 ESS_SIGNING_CERT *sc = NULL; 820 int i; 821 822 /* Creating the ESS_CERT_ID stack. */ 823 if (!(sc = ESS_SIGNING_CERT_new())) 824 goto err; 825 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null())) 826 goto err; 827 828 /* Adding the signing certificate id. */ 829 if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) || 830 !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 831 goto err; 832 /* Adding the certificate chain ids. */ 833 for (i = 0; i < sk_X509_num(certs); ++i) { 834 X509 *cert = sk_X509_value(certs, i); 835 if (!(cid = ESS_CERT_ID_new_init(cert, 1)) || 836 !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 837 goto err; 838 } 839 840 return sc; 841 842 err: 843 ESS_SIGNING_CERT_free(sc); 844 TSerror(ERR_R_MALLOC_FAILURE); 845 return NULL; 846 } 847 848 static ESS_CERT_ID * 849 ESS_CERT_ID_new_init(X509 *cert, int issuer_needed) 850 { 851 ESS_CERT_ID *cid = NULL; 852 GENERAL_NAME *name = NULL; 853 unsigned char cert_hash[TS_HASH_LEN]; 854 855 /* Recompute SHA1 hash of certificate if necessary (side effect). */ 856 X509_check_purpose(cert, -1, 0); 857 858 if (!(cid = ESS_CERT_ID_new())) 859 goto err; 860 861 if (!X509_digest(cert, TS_HASH_EVP, cert_hash, NULL)) 862 goto err; 863 864 if (!ASN1_OCTET_STRING_set(cid->hash, cert_hash, sizeof(cert_hash))) 865 goto err; 866 867 /* Setting the issuer/serial if requested. */ 868 if (issuer_needed) { 869 /* Creating issuer/serial structure. */ 870 if (!cid->issuer_serial && 871 !(cid->issuer_serial = ESS_ISSUER_SERIAL_new())) 872 goto err; 873 /* Creating general name from the certificate issuer. */ 874 if (!(name = GENERAL_NAME_new())) 875 goto err; 876 name->type = GEN_DIRNAME; 877 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer))) 878 goto err; 879 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 880 goto err; 881 name = NULL; /* Ownership is lost. */ 882 /* Setting the serial number. */ 883 ASN1_INTEGER_free(cid->issuer_serial->serial); 884 if (!(cid->issuer_serial->serial = 885 ASN1_INTEGER_dup(cert->cert_info->serialNumber))) 886 goto err; 887 } 888 889 return cid; 890 891 err: 892 GENERAL_NAME_free(name); 893 ESS_CERT_ID_free(cid); 894 TSerror(ERR_R_MALLOC_FAILURE); 895 return NULL; 896 } 897 898 static int 899 TS_TST_INFO_content_new(PKCS7 *p7) 900 { 901 PKCS7 *ret = NULL; 902 ASN1_OCTET_STRING *octet_string = NULL; 903 904 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 905 if (!(ret = PKCS7_new())) 906 goto err; 907 if (!(ret->d.other = ASN1_TYPE_new())) 908 goto err; 909 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 910 if (!(octet_string = ASN1_OCTET_STRING_new())) 911 goto err; 912 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 913 octet_string = NULL; 914 915 /* Add encapsulated content to signed PKCS7 structure. */ 916 if (!PKCS7_set_content(p7, ret)) 917 goto err; 918 919 return 1; 920 921 err: 922 ASN1_OCTET_STRING_free(octet_string); 923 PKCS7_free(ret); 924 return 0; 925 } 926 927 static int 928 ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 929 { 930 ASN1_STRING *seq = NULL; 931 unsigned char *p, *pp = NULL; 932 int len; 933 934 len = i2d_ESS_SIGNING_CERT(sc, NULL); 935 if (!(pp = malloc(len))) { 936 TSerror(ERR_R_MALLOC_FAILURE); 937 goto err; 938 } 939 p = pp; 940 i2d_ESS_SIGNING_CERT(sc, &p); 941 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) { 942 TSerror(ERR_R_MALLOC_FAILURE); 943 goto err; 944 } 945 free(pp); 946 pp = NULL; 947 return PKCS7_add_signed_attribute(si, 948 NID_id_smime_aa_signingCertificate, V_ASN1_SEQUENCE, seq); 949 950 err: 951 ASN1_STRING_free(seq); 952 free(pp); 953 954 return 0; 955 } 956 957 958 static ASN1_GENERALIZEDTIME * 959 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 960 time_t sec, long usec, unsigned precision) 961 { 962 struct tm *tm = NULL; 963 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 964 char usecstr[TS_MAX_CLOCK_PRECISION_DIGITS + 2]; 965 char *p; 966 int rv; 967 968 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 969 goto err; 970 971 if (!(tm = gmtime(&sec))) 972 goto err; 973 974 /* 975 * Put "genTime_str" in GeneralizedTime format. We work around the 976 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 977 * NOT include fractional seconds") and OpenSSL related functions to 978 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 979 * fraction-of-second details". 980 */ 981 if (precision > 0) { 982 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides 983 the following restrictions for a DER-encoding, which OpenSSL 984 (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 985 support: 986 "The encoding MUST terminate with a "Z" (which means "Zulu" 987 time). The decimal point element, if present, MUST be the 988 point option ".". The fractional-seconds elements, 989 if present, MUST omit all trailing 0's; 990 if the elements correspond to 0, they MUST be wholly 991 omitted, and the decimal point element also MUST be 992 omitted." */ 993 (void) snprintf(usecstr, sizeof(usecstr), ".%06ld", usec); 994 /* truncate and trim trailing 0 */ 995 usecstr[precision + 1] = '\0'; 996 p = usecstr + strlen(usecstr) - 1; 997 while (p > usecstr && *p == '0') 998 *p-- = '\0'; 999 /* if we've reached the beginning, delete the . too */ 1000 if (p == usecstr) 1001 *p = '\0'; 1002 1003 } else { 1004 /* empty */ 1005 usecstr[0] = '\0'; 1006 } 1007 rv = snprintf(genTime_str, sizeof(genTime_str), 1008 "%04d%02d%02d%02d%02d%02d%sZ", 1009 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 1010 tm->tm_hour, tm->tm_min, tm->tm_sec, usecstr); 1011 if (rv < 0 || rv >= sizeof(genTime_str)) 1012 goto err; 1013 1014 /* Now call OpenSSL to check and set our genTime value */ 1015 if (!asn1_time && !(asn1_time = ASN1_GENERALIZEDTIME_new())) 1016 goto err; 1017 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1018 ASN1_GENERALIZEDTIME_free(asn1_time); 1019 goto err; 1020 } 1021 1022 return asn1_time; 1023 1024 err: 1025 TSerror(TS_R_COULD_NOT_SET_TIME); 1026 return NULL; 1027 } 1028