1 /* $OpenBSD: ts_rsp_sign.c,v 1.23 2019/07/03 03:24:04 deraadt 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 /* Private function declarations. */ 69 70 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *); 71 static int def_time_cb(struct TS_resp_ctx *, void *, time_t *sec, long *usec); 72 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *); 73 74 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx); 75 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx); 76 static int TS_RESP_check_request(TS_RESP_CTX *ctx); 77 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx); 78 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 79 ASN1_OBJECT *policy); 80 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx); 81 static int TS_RESP_sign(TS_RESP_CTX *ctx); 82 83 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 84 STACK_OF(X509) *certs); 85 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed); 86 static int TS_TST_INFO_content_new(PKCS7 *p7); 87 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc); 88 89 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision( 90 ASN1_GENERALIZEDTIME *, time_t, long, unsigned); 91 92 /* Default callbacks for response generation. */ 93 94 static ASN1_INTEGER * 95 def_serial_cb(struct TS_resp_ctx *ctx, void *data) 96 { 97 ASN1_INTEGER *serial = ASN1_INTEGER_new(); 98 99 if (!serial) 100 goto err; 101 if (!ASN1_INTEGER_set(serial, 1)) 102 goto err; 103 return serial; 104 105 err: 106 TSerror(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 /* Use the gettimeofday function call. */ 113 static int 114 def_time_cb(struct TS_resp_ctx *ctx, void *data, time_t *sec, long *usec) 115 { 116 struct timeval tv; 117 118 if (gettimeofday(&tv, NULL) != 0) { 119 TSerror(TS_R_TIME_SYSCALL_ERROR); 120 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 121 "Time is not available."); 122 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 123 return 0; 124 } 125 /* Return time to caller. */ 126 *sec = tv.tv_sec; 127 *usec = tv.tv_usec; 128 129 return 1; 130 } 131 132 static int 133 def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, void *data) 134 { 135 /* No extensions are processed here. */ 136 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 137 "Unsupported extension."); 138 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 139 return 0; 140 } 141 142 /* TS_RESP_CTX management functions. */ 143 144 TS_RESP_CTX * 145 TS_RESP_CTX_new(void) 146 { 147 TS_RESP_CTX *ctx; 148 149 if (!(ctx = calloc(1, sizeof(TS_RESP_CTX)))) { 150 TSerror(ERR_R_MALLOC_FAILURE); 151 return NULL; 152 } 153 154 /* Setting default callbacks. */ 155 ctx->serial_cb = def_serial_cb; 156 ctx->time_cb = def_time_cb; 157 ctx->extension_cb = def_extension_cb; 158 159 return ctx; 160 } 161 162 void 163 TS_RESP_CTX_free(TS_RESP_CTX *ctx) 164 { 165 if (!ctx) 166 return; 167 168 X509_free(ctx->signer_cert); 169 EVP_PKEY_free(ctx->signer_key); 170 sk_X509_pop_free(ctx->certs, X509_free); 171 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 172 ASN1_OBJECT_free(ctx->default_policy); 173 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 174 ASN1_INTEGER_free(ctx->seconds); 175 ASN1_INTEGER_free(ctx->millis); 176 ASN1_INTEGER_free(ctx->micros); 177 free(ctx); 178 } 179 180 int 181 TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 182 { 183 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 184 TSerror(TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 185 return 0; 186 } 187 X509_free(ctx->signer_cert); 188 ctx->signer_cert = signer; 189 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509); 190 return 1; 191 } 192 193 int 194 TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 195 { 196 EVP_PKEY_free(ctx->signer_key); 197 ctx->signer_key = key; 198 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY); 199 200 return 1; 201 } 202 203 int 204 TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy) 205 { 206 if (ctx->default_policy) 207 ASN1_OBJECT_free(ctx->default_policy); 208 if (!(ctx->default_policy = OBJ_dup(def_policy))) 209 goto err; 210 return 1; 211 212 err: 213 TSerror(ERR_R_MALLOC_FAILURE); 214 return 0; 215 } 216 217 int 218 TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 219 { 220 int i; 221 222 if (ctx->certs) { 223 sk_X509_pop_free(ctx->certs, X509_free); 224 ctx->certs = NULL; 225 } 226 if (!certs) 227 return 1; 228 if (!(ctx->certs = sk_X509_dup(certs))) { 229 TSerror(ERR_R_MALLOC_FAILURE); 230 return 0; 231 } 232 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 233 X509 *cert = sk_X509_value(ctx->certs, i); 234 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509); 235 } 236 237 return 1; 238 } 239 240 int 241 TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy) 242 { 243 ASN1_OBJECT *copy = NULL; 244 245 /* Create new policy stack if necessary. */ 246 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 247 goto err; 248 if (!(copy = OBJ_dup(policy))) 249 goto err; 250 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 251 goto err; 252 253 return 1; 254 255 err: 256 TSerror(ERR_R_MALLOC_FAILURE); 257 ASN1_OBJECT_free(copy); 258 return 0; 259 } 260 261 int 262 TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 263 { 264 /* Create new md stack if necessary. */ 265 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 266 goto err; 267 /* Add the shared md, no copy needed. */ 268 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) 269 goto err; 270 271 return 1; 272 273 err: 274 TSerror(ERR_R_MALLOC_FAILURE); 275 return 0; 276 } 277 278 #define TS_RESP_CTX_accuracy_free(ctx) \ 279 ASN1_INTEGER_free(ctx->seconds); \ 280 ctx->seconds = NULL; \ 281 ASN1_INTEGER_free(ctx->millis); \ 282 ctx->millis = NULL; \ 283 ASN1_INTEGER_free(ctx->micros); \ 284 ctx->micros = NULL; 285 286 int 287 TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, int secs, int millis, int micros) 288 { 289 TS_RESP_CTX_accuracy_free(ctx); 290 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) || 291 !ASN1_INTEGER_set(ctx->seconds, secs))) 292 goto err; 293 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) || 294 !ASN1_INTEGER_set(ctx->millis, millis))) 295 goto err; 296 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) || 297 !ASN1_INTEGER_set(ctx->micros, micros))) 298 goto err; 299 300 return 1; 301 302 err: 303 TS_RESP_CTX_accuracy_free(ctx); 304 TSerror(ERR_R_MALLOC_FAILURE); 305 return 0; 306 } 307 308 void 309 TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 310 { 311 ctx->flags |= flags; 312 } 313 314 void 315 TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 316 { 317 ctx->serial_cb = cb; 318 ctx->serial_cb_data = data; 319 } 320 321 void 322 TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, TS_extension_cb cb, void *data) 323 { 324 ctx->extension_cb = cb; 325 ctx->extension_cb_data = data; 326 } 327 328 int 329 TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, int status, const char *text) 330 { 331 TS_STATUS_INFO *si = NULL; 332 ASN1_UTF8STRING *utf8_text = NULL; 333 int ret = 0; 334 335 if (!(si = TS_STATUS_INFO_new())) 336 goto err; 337 if (!ASN1_INTEGER_set(si->status, status)) 338 goto err; 339 if (text) { 340 if (!(utf8_text = ASN1_UTF8STRING_new()) || 341 !ASN1_STRING_set(utf8_text, text, strlen(text))) 342 goto err; 343 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null())) 344 goto err; 345 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 346 goto err; 347 utf8_text = NULL; /* Ownership is lost. */ 348 } 349 if (!TS_RESP_set_status_info(ctx->response, si)) 350 goto err; 351 ret = 1; 352 353 err: 354 if (!ret) 355 TSerror(ERR_R_MALLOC_FAILURE); 356 TS_STATUS_INFO_free(si); 357 ASN1_UTF8STRING_free(utf8_text); 358 return ret; 359 } 360 361 int 362 TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, int status, const char *text) 363 { 364 int ret = 1; 365 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 366 367 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 368 /* Status has not been set, set it now. */ 369 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 370 } 371 return ret; 372 } 373 374 int 375 TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 376 { 377 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 378 379 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new())) 380 goto err; 381 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 382 goto err; 383 return 1; 384 385 err: 386 TSerror(ERR_R_MALLOC_FAILURE); 387 return 0; 388 } 389 390 TS_REQ * 391 TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 392 { 393 return ctx->request; 394 } 395 396 TS_TST_INFO * 397 TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 398 { 399 return ctx->tst_info; 400 } 401 402 int 403 TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision) 404 { 405 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 406 return 0; 407 ctx->clock_precision_digits = precision; 408 return 1; 409 } 410 411 /* Main entry method of the response generation. */ 412 TS_RESP * 413 TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 414 { 415 ASN1_OBJECT *policy; 416 TS_RESP *response; 417 int result = 0; 418 419 TS_RESP_CTX_init(ctx); 420 421 /* Creating the response object. */ 422 if (!(ctx->response = TS_RESP_new())) { 423 TSerror(ERR_R_MALLOC_FAILURE); 424 goto end; 425 } 426 427 /* Parsing DER request. */ 428 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) { 429 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 430 "Bad request format or " 431 "system error."); 432 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 433 goto end; 434 } 435 436 /* Setting default status info. */ 437 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 438 goto end; 439 440 /* Checking the request format. */ 441 if (!TS_RESP_check_request(ctx)) 442 goto end; 443 444 /* Checking acceptable policies. */ 445 if (!(policy = TS_RESP_get_policy(ctx))) 446 goto end; 447 448 /* Creating the TS_TST_INFO object. */ 449 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy))) 450 goto end; 451 452 /* Processing extensions. */ 453 if (!TS_RESP_process_extensions(ctx)) 454 goto end; 455 456 /* Generating the signature. */ 457 if (!TS_RESP_sign(ctx)) 458 goto end; 459 460 /* Everything was successful. */ 461 result = 1; 462 463 end: 464 if (!result) { 465 TSerror(TS_R_RESPONSE_SETUP_ERROR); 466 if (ctx->response != NULL) { 467 if (TS_RESP_CTX_set_status_info_cond(ctx, 468 TS_STATUS_REJECTION, "Error during response " 469 "generation.") == 0) { 470 TS_RESP_free(ctx->response); 471 ctx->response = NULL; 472 } 473 } 474 } 475 response = ctx->response; 476 ctx->response = NULL; /* Ownership will be returned to caller. */ 477 TS_RESP_CTX_cleanup(ctx); 478 return response; 479 } 480 481 /* Initializes the variable part of the context. */ 482 static void 483 TS_RESP_CTX_init(TS_RESP_CTX *ctx) 484 { 485 ctx->request = NULL; 486 ctx->response = NULL; 487 ctx->tst_info = NULL; 488 } 489 490 /* Cleans up the variable part of the context. */ 491 static void 492 TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 493 { 494 TS_REQ_free(ctx->request); 495 ctx->request = NULL; 496 TS_RESP_free(ctx->response); 497 ctx->response = NULL; 498 TS_TST_INFO_free(ctx->tst_info); 499 ctx->tst_info = NULL; 500 } 501 502 /* Checks the format and content of the request. */ 503 static int 504 TS_RESP_check_request(TS_RESP_CTX *ctx) 505 { 506 TS_REQ *request = ctx->request; 507 TS_MSG_IMPRINT *msg_imprint; 508 X509_ALGOR *md_alg; 509 int md_alg_id; 510 const ASN1_OCTET_STRING *digest; 511 EVP_MD *md = NULL; 512 int i; 513 514 /* Checking request version. */ 515 if (TS_REQ_get_version(request) != 1) { 516 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 517 "Bad request version."); 518 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 519 return 0; 520 } 521 522 /* Checking message digest algorithm. */ 523 msg_imprint = TS_REQ_get_msg_imprint(request); 524 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint); 525 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 526 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 527 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 528 if (md_alg_id == EVP_MD_type(current_md)) 529 md = current_md; 530 } 531 if (!md) { 532 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 533 "Message digest algorithm is " 534 "not supported."); 535 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 536 return 0; 537 } 538 539 /* No message digest takes parameter. */ 540 if (md_alg->parameter && 541 ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 542 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 543 "Superfluous message digest " 544 "parameter."); 545 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 546 return 0; 547 } 548 /* Checking message digest size. */ 549 digest = TS_MSG_IMPRINT_get_msg(msg_imprint); 550 if (digest->length != EVP_MD_size(md)) { 551 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 552 "Bad message digest."); 553 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 554 return 0; 555 } 556 557 return 1; 558 } 559 560 /* Returns the TSA policy based on the requested and acceptable policies. */ 561 static ASN1_OBJECT * 562 TS_RESP_get_policy(TS_RESP_CTX *ctx) 563 { 564 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request); 565 ASN1_OBJECT *policy = NULL; 566 int i; 567 568 if (ctx->default_policy == NULL) { 569 TSerror(TS_R_INVALID_NULL_POINTER); 570 return NULL; 571 } 572 /* Return the default policy if none is requested or the default is 573 requested. */ 574 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 575 policy = ctx->default_policy; 576 577 /* Check if the policy is acceptable. */ 578 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 579 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 580 if (!OBJ_cmp(requested, current)) 581 policy = current; 582 } 583 if (!policy) { 584 TSerror(TS_R_UNACCEPTABLE_POLICY); 585 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 586 "Requested policy is not " 587 "supported."); 588 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 589 } 590 return policy; 591 } 592 593 /* Creates the TS_TST_INFO object based on the settings of the context. */ 594 static TS_TST_INFO * 595 TS_RESP_create_tst_info(TS_RESP_CTX *ctx, ASN1_OBJECT *policy) 596 { 597 int result = 0; 598 TS_TST_INFO *tst_info = NULL; 599 ASN1_INTEGER *serial = NULL; 600 ASN1_GENERALIZEDTIME *asn1_time = NULL; 601 time_t sec; 602 long usec; 603 TS_ACCURACY *accuracy = NULL; 604 const ASN1_INTEGER *nonce; 605 GENERAL_NAME *tsa_name = NULL; 606 607 if (!(tst_info = TS_TST_INFO_new())) 608 goto end; 609 if (!TS_TST_INFO_set_version(tst_info, 1)) 610 goto end; 611 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 612 goto end; 613 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 614 goto end; 615 if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data)) || 616 !TS_TST_INFO_set_serial(tst_info, serial)) 617 goto end; 618 if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec) || 619 !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, sec, usec, 620 ctx->clock_precision_digits)) || 621 !TS_TST_INFO_set_time(tst_info, asn1_time)) 622 goto end; 623 624 /* Setting accuracy if needed. */ 625 if ((ctx->seconds || ctx->millis || ctx->micros) && 626 !(accuracy = TS_ACCURACY_new())) 627 goto end; 628 629 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 630 goto end; 631 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 632 goto end; 633 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 634 goto end; 635 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 636 goto end; 637 638 /* Setting ordering. */ 639 if ((ctx->flags & TS_ORDERING) && 640 !TS_TST_INFO_set_ordering(tst_info, 1)) 641 goto end; 642 643 /* Setting nonce if needed. */ 644 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL && 645 !TS_TST_INFO_set_nonce(tst_info, nonce)) 646 goto end; 647 648 /* Setting TSA name to subject of signer certificate. */ 649 if (ctx->flags & TS_TSA_NAME) { 650 if (!(tsa_name = GENERAL_NAME_new())) 651 goto end; 652 tsa_name->type = GEN_DIRNAME; 653 tsa_name->d.dirn = 654 X509_NAME_dup(ctx->signer_cert->cert_info->subject); 655 if (!tsa_name->d.dirn) 656 goto end; 657 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 658 goto end; 659 } 660 661 result = 1; 662 663 end: 664 if (!result) { 665 TS_TST_INFO_free(tst_info); 666 tst_info = NULL; 667 TSerror(TS_R_TST_INFO_SETUP_ERROR); 668 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 669 "Error during TSTInfo " 670 "generation."); 671 } 672 GENERAL_NAME_free(tsa_name); 673 TS_ACCURACY_free(accuracy); 674 ASN1_GENERALIZEDTIME_free(asn1_time); 675 ASN1_INTEGER_free(serial); 676 677 return tst_info; 678 } 679 680 /* Processing the extensions of the request. */ 681 static int 682 TS_RESP_process_extensions(TS_RESP_CTX *ctx) 683 { 684 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request); 685 int i; 686 int ok = 1; 687 688 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 689 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 690 /* XXXXX The last argument was previously 691 (void *)ctx->extension_cb, but ISO C doesn't permit 692 converting a function pointer to void *. For lack of 693 better information, I'm placing a NULL there instead. 694 The callback can pick its own address out from the ctx 695 anyway... 696 */ 697 ok = (*ctx->extension_cb)(ctx, ext, NULL); 698 } 699 700 return ok; 701 } 702 703 /* Functions for signing the TS_TST_INFO structure of the context. */ 704 static int 705 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 TSerror(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 TSerror(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 TSerror(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 TSerror(TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 757 goto err; 758 } 759 760 /* Create the ESS SigningCertificate attribute which contains 761 the signer certificate id and optionally the certificate chain. */ 762 certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL; 763 if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs))) 764 goto err; 765 766 /* Add SigningCertificate signed attribute to the signer info. */ 767 if (!ESS_add_signing_cert(si, sc)) { 768 TSerror(TS_R_ESS_ADD_SIGNING_CERT_ERROR); 769 goto err; 770 } 771 772 /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */ 773 if (!TS_TST_INFO_content_new(p7)) 774 goto err; 775 776 /* Add the DER encoded tst_info to the PKCS7 structure. */ 777 if (!(p7bio = PKCS7_dataInit(p7, NULL))) { 778 TSerror(ERR_R_MALLOC_FAILURE); 779 goto err; 780 } 781 782 /* Convert tst_info to DER. */ 783 if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) { 784 TSerror(TS_R_TS_DATASIGN); 785 goto err; 786 } 787 788 /* Create the signature and add it to the signer info. */ 789 if (!PKCS7_dataFinal(p7, p7bio)) { 790 TSerror(TS_R_TS_DATASIGN); 791 goto err; 792 } 793 794 /* Set new PKCS7 and TST_INFO objects. */ 795 TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info); 796 p7 = NULL; /* Ownership is lost. */ 797 ctx->tst_info = NULL; /* Ownership is lost. */ 798 799 ret = 1; 800 801 err: 802 if (!ret) 803 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 804 "Error during signature " 805 "generation."); 806 BIO_free_all(p7bio); 807 ESS_SIGNING_CERT_free(sc); 808 PKCS7_free(p7); 809 return ret; 810 } 811 812 static ESS_SIGNING_CERT * 813 ESS_SIGNING_CERT_new_init(X509 *signcert, STACK_OF(X509) *certs) 814 { 815 ESS_CERT_ID *cid; 816 ESS_SIGNING_CERT *sc = NULL; 817 int i; 818 819 /* Creating the ESS_CERT_ID stack. */ 820 if (!(sc = ESS_SIGNING_CERT_new())) 821 goto err; 822 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null())) 823 goto err; 824 825 /* Adding the signing certificate id. */ 826 if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) || 827 !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 828 goto err; 829 /* Adding the certificate chain ids. */ 830 for (i = 0; i < sk_X509_num(certs); ++i) { 831 X509 *cert = sk_X509_value(certs, i); 832 if (!(cid = ESS_CERT_ID_new_init(cert, 1)) || 833 !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 834 goto err; 835 } 836 837 return sc; 838 839 err: 840 ESS_SIGNING_CERT_free(sc); 841 TSerror(ERR_R_MALLOC_FAILURE); 842 return NULL; 843 } 844 845 static ESS_CERT_ID * 846 ESS_CERT_ID_new_init(X509 *cert, int issuer_needed) 847 { 848 ESS_CERT_ID *cid = NULL; 849 GENERAL_NAME *name = NULL; 850 851 /* Recompute SHA1 hash of certificate if necessary (side effect). */ 852 X509_check_purpose(cert, -1, 0); 853 854 if (!(cid = ESS_CERT_ID_new())) 855 goto err; 856 if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash, 857 sizeof(cert->sha1_hash))) 858 goto err; 859 860 /* Setting the issuer/serial if requested. */ 861 if (issuer_needed) { 862 /* Creating issuer/serial structure. */ 863 if (!cid->issuer_serial && 864 !(cid->issuer_serial = ESS_ISSUER_SERIAL_new())) 865 goto err; 866 /* Creating general name from the certificate issuer. */ 867 if (!(name = GENERAL_NAME_new())) 868 goto err; 869 name->type = GEN_DIRNAME; 870 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer))) 871 goto err; 872 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 873 goto err; 874 name = NULL; /* Ownership is lost. */ 875 /* Setting the serial number. */ 876 ASN1_INTEGER_free(cid->issuer_serial->serial); 877 if (!(cid->issuer_serial->serial = 878 ASN1_INTEGER_dup(cert->cert_info->serialNumber))) 879 goto err; 880 } 881 882 return cid; 883 884 err: 885 GENERAL_NAME_free(name); 886 ESS_CERT_ID_free(cid); 887 TSerror(ERR_R_MALLOC_FAILURE); 888 return NULL; 889 } 890 891 static int 892 TS_TST_INFO_content_new(PKCS7 *p7) 893 { 894 PKCS7 *ret = NULL; 895 ASN1_OCTET_STRING *octet_string = NULL; 896 897 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 898 if (!(ret = PKCS7_new())) 899 goto err; 900 if (!(ret->d.other = ASN1_TYPE_new())) 901 goto err; 902 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 903 if (!(octet_string = ASN1_OCTET_STRING_new())) 904 goto err; 905 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 906 octet_string = NULL; 907 908 /* Add encapsulated content to signed PKCS7 structure. */ 909 if (!PKCS7_set_content(p7, ret)) 910 goto err; 911 912 return 1; 913 914 err: 915 ASN1_OCTET_STRING_free(octet_string); 916 PKCS7_free(ret); 917 return 0; 918 } 919 920 static int 921 ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 922 { 923 ASN1_STRING *seq = NULL; 924 unsigned char *p, *pp = NULL; 925 int len; 926 927 len = i2d_ESS_SIGNING_CERT(sc, NULL); 928 if (!(pp = malloc(len))) { 929 TSerror(ERR_R_MALLOC_FAILURE); 930 goto err; 931 } 932 p = pp; 933 i2d_ESS_SIGNING_CERT(sc, &p); 934 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) { 935 TSerror(ERR_R_MALLOC_FAILURE); 936 goto err; 937 } 938 free(pp); 939 pp = NULL; 940 return PKCS7_add_signed_attribute(si, 941 NID_id_smime_aa_signingCertificate, V_ASN1_SEQUENCE, seq); 942 943 err: 944 ASN1_STRING_free(seq); 945 free(pp); 946 947 return 0; 948 } 949 950 951 static ASN1_GENERALIZEDTIME * 952 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 953 time_t sec, long usec, unsigned precision) 954 { 955 struct tm *tm = NULL; 956 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 957 char usecstr[TS_MAX_CLOCK_PRECISION_DIGITS + 2]; 958 char *p; 959 int rv; 960 961 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 962 goto err; 963 964 if (!(tm = gmtime(&sec))) 965 goto err; 966 967 /* 968 * Put "genTime_str" in GeneralizedTime format. We work around the 969 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 970 * NOT include fractional seconds") and OpenSSL related functions to 971 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 972 * fraction-of-second details". 973 */ 974 if (precision > 0) { 975 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides 976 the following restrictions for a DER-encoding, which OpenSSL 977 (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 978 support: 979 "The encoding MUST terminate with a "Z" (which means "Zulu" 980 time). The decimal point element, if present, MUST be the 981 point option ".". The fractional-seconds elements, 982 if present, MUST omit all trailing 0's; 983 if the elements correspond to 0, they MUST be wholly 984 omitted, and the decimal point element also MUST be 985 omitted." */ 986 (void) snprintf(usecstr, sizeof(usecstr), ".%06ld", usec); 987 /* truncate and trim trailing 0 */ 988 usecstr[precision + 1] = '\0'; 989 p = usecstr + strlen(usecstr) - 1; 990 while (p > usecstr && *p == '0') 991 *p-- = '\0'; 992 /* if we've reached the beginning, delete the . too */ 993 if (p == usecstr) 994 *p = '\0'; 995 996 } else { 997 /* empty */ 998 usecstr[0] = '\0'; 999 } 1000 rv = snprintf(genTime_str, sizeof(genTime_str), 1001 "%04d%02d%02d%02d%02d%02d%sZ", 1002 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 1003 tm->tm_hour, tm->tm_min, tm->tm_sec, usecstr); 1004 if (rv < 0 || rv >= sizeof(genTime_str)) 1005 goto err; 1006 1007 /* Now call OpenSSL to check and set our genTime value */ 1008 if (!asn1_time && !(asn1_time = ASN1_GENERALIZEDTIME_new())) 1009 goto err; 1010 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1011 ASN1_GENERALIZEDTIME_free(asn1_time); 1012 goto err; 1013 } 1014 1015 return asn1_time; 1016 1017 err: 1018 TSerror(TS_R_COULD_NOT_SET_TIME); 1019 return NULL; 1020 } 1021