1 /* $OpenBSD: ts_rsp_sign.c,v 1.19 2015/09/30 18:04:02 jsing 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 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 /* 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 TSerr(TS_F_DEF_TIME_CB, 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 TSerr(TS_F_TS_RESP_CTX_NEW, 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 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 185 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 186 return 0; 187 } 188 X509_free(ctx->signer_cert); 189 ctx->signer_cert = signer; 190 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509); 191 return 1; 192 } 193 194 int 195 TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 196 { 197 EVP_PKEY_free(ctx->signer_key); 198 ctx->signer_key = key; 199 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY); 200 201 return 1; 202 } 203 204 int 205 TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy) 206 { 207 if (ctx->default_policy) 208 ASN1_OBJECT_free(ctx->default_policy); 209 if (!(ctx->default_policy = OBJ_dup(def_policy))) 210 goto err; 211 return 1; 212 213 err: 214 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE); 215 return 0; 216 } 217 218 int 219 TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 220 { 221 int i; 222 223 if (ctx->certs) { 224 sk_X509_pop_free(ctx->certs, X509_free); 225 ctx->certs = NULL; 226 } 227 if (!certs) 228 return 1; 229 if (!(ctx->certs = sk_X509_dup(certs))) { 230 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE); 231 return 0; 232 } 233 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 234 X509 *cert = sk_X509_value(ctx->certs, i); 235 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509); 236 } 237 238 return 1; 239 } 240 241 int 242 TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy) 243 { 244 ASN1_OBJECT *copy = NULL; 245 246 /* Create new policy stack if necessary. */ 247 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 248 goto err; 249 if (!(copy = OBJ_dup(policy))) 250 goto err; 251 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 252 goto err; 253 254 return 1; 255 256 err: 257 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE); 258 ASN1_OBJECT_free(copy); 259 return 0; 260 } 261 262 int 263 TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 264 { 265 /* Create new md stack if necessary. */ 266 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 267 goto err; 268 /* Add the shared md, no copy needed. */ 269 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) 270 goto err; 271 272 return 1; 273 274 err: 275 TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE); 276 return 0; 277 } 278 279 #define TS_RESP_CTX_accuracy_free(ctx) \ 280 ASN1_INTEGER_free(ctx->seconds); \ 281 ctx->seconds = NULL; \ 282 ASN1_INTEGER_free(ctx->millis); \ 283 ctx->millis = NULL; \ 284 ASN1_INTEGER_free(ctx->micros); \ 285 ctx->micros = NULL; 286 287 int 288 TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, int secs, int millis, int micros) 289 { 290 TS_RESP_CTX_accuracy_free(ctx); 291 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) || 292 !ASN1_INTEGER_set(ctx->seconds, secs))) 293 goto err; 294 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) || 295 !ASN1_INTEGER_set(ctx->millis, millis))) 296 goto err; 297 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) || 298 !ASN1_INTEGER_set(ctx->micros, micros))) 299 goto err; 300 301 return 1; 302 303 err: 304 TS_RESP_CTX_accuracy_free(ctx); 305 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE); 306 return 0; 307 } 308 309 void 310 TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 311 { 312 ctx->flags |= flags; 313 } 314 315 void 316 TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 317 { 318 ctx->serial_cb = cb; 319 ctx->serial_cb_data = data; 320 } 321 322 void 323 TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, TS_extension_cb cb, void *data) 324 { 325 ctx->extension_cb = cb; 326 ctx->extension_cb_data = data; 327 } 328 329 int 330 TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, int status, const char *text) 331 { 332 TS_STATUS_INFO *si = NULL; 333 ASN1_UTF8STRING *utf8_text = NULL; 334 int ret = 0; 335 336 if (!(si = TS_STATUS_INFO_new())) 337 goto err; 338 if (!ASN1_INTEGER_set(si->status, status)) 339 goto err; 340 if (text) { 341 if (!(utf8_text = ASN1_UTF8STRING_new()) || 342 !ASN1_STRING_set(utf8_text, text, strlen(text))) 343 goto err; 344 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null())) 345 goto err; 346 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 347 goto err; 348 utf8_text = NULL; /* Ownership is lost. */ 349 } 350 if (!TS_RESP_set_status_info(ctx->response, si)) 351 goto err; 352 ret = 1; 353 354 err: 355 if (!ret) 356 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE); 357 TS_STATUS_INFO_free(si); 358 ASN1_UTF8STRING_free(utf8_text); 359 return ret; 360 } 361 362 int 363 TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, int status, const char *text) 364 { 365 int ret = 1; 366 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 367 368 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 369 /* Status has not been set, set it now. */ 370 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 371 } 372 return ret; 373 } 374 375 int 376 TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 377 { 378 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 379 380 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new())) 381 goto err; 382 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 383 goto err; 384 return 1; 385 386 err: 387 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE); 388 return 0; 389 } 390 391 TS_REQ * 392 TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 393 { 394 return ctx->request; 395 } 396 397 TS_TST_INFO * 398 TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 399 { 400 return ctx->tst_info; 401 } 402 403 int 404 TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision) 405 { 406 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 407 return 0; 408 ctx->clock_precision_digits = precision; 409 return 1; 410 } 411 412 /* Main entry method of the response generation. */ 413 TS_RESP * 414 TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 415 { 416 ASN1_OBJECT *policy; 417 TS_RESP *response; 418 int result = 0; 419 420 TS_RESP_CTX_init(ctx); 421 422 /* Creating the response object. */ 423 if (!(ctx->response = TS_RESP_new())) { 424 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE); 425 goto end; 426 } 427 428 /* Parsing DER request. */ 429 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) { 430 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 431 "Bad request format or " 432 "system error."); 433 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 434 goto end; 435 } 436 437 /* Setting default status info. */ 438 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 439 goto end; 440 441 /* Checking the request format. */ 442 if (!TS_RESP_check_request(ctx)) 443 goto end; 444 445 /* Checking acceptable policies. */ 446 if (!(policy = TS_RESP_get_policy(ctx))) 447 goto end; 448 449 /* Creating the TS_TST_INFO object. */ 450 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy))) 451 goto end; 452 453 /* Processing extensions. */ 454 if (!TS_RESP_process_extensions(ctx)) 455 goto end; 456 457 /* Generating the signature. */ 458 if (!TS_RESP_sign(ctx)) 459 goto end; 460 461 /* Everything was successful. */ 462 result = 1; 463 464 end: 465 if (!result) { 466 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR); 467 if (ctx->response != NULL) { 468 if (TS_RESP_CTX_set_status_info_cond(ctx, 469 TS_STATUS_REJECTION, "Error during response " 470 "generation.") == 0) { 471 TS_RESP_free(ctx->response); 472 ctx->response = NULL; 473 } 474 } 475 } 476 response = ctx->response; 477 ctx->response = NULL; /* Ownership will be returned to caller. */ 478 TS_RESP_CTX_cleanup(ctx); 479 return response; 480 } 481 482 /* Initializes the variable part of the context. */ 483 static void 484 TS_RESP_CTX_init(TS_RESP_CTX *ctx) 485 { 486 ctx->request = NULL; 487 ctx->response = NULL; 488 ctx->tst_info = NULL; 489 } 490 491 /* Cleans up the variable part of the context. */ 492 static void 493 TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 494 { 495 TS_REQ_free(ctx->request); 496 ctx->request = NULL; 497 TS_RESP_free(ctx->response); 498 ctx->response = NULL; 499 TS_TST_INFO_free(ctx->tst_info); 500 ctx->tst_info = NULL; 501 } 502 503 /* Checks the format and content of the request. */ 504 static int 505 TS_RESP_check_request(TS_RESP_CTX *ctx) 506 { 507 TS_REQ *request = ctx->request; 508 TS_MSG_IMPRINT *msg_imprint; 509 X509_ALGOR *md_alg; 510 int md_alg_id; 511 const ASN1_OCTET_STRING *digest; 512 EVP_MD *md = NULL; 513 int i; 514 515 /* Checking request version. */ 516 if (TS_REQ_get_version(request) != 1) { 517 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 518 "Bad request version."); 519 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 520 return 0; 521 } 522 523 /* Checking message digest algorithm. */ 524 msg_imprint = TS_REQ_get_msg_imprint(request); 525 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint); 526 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 527 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 528 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 529 if (md_alg_id == EVP_MD_type(current_md)) 530 md = current_md; 531 } 532 if (!md) { 533 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 534 "Message digest algorithm is " 535 "not supported."); 536 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 537 return 0; 538 } 539 540 /* No message digest takes parameter. */ 541 if (md_alg->parameter && 542 ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 543 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 544 "Superfluous message digest " 545 "parameter."); 546 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 547 return 0; 548 } 549 /* Checking message digest size. */ 550 digest = TS_MSG_IMPRINT_get_msg(msg_imprint); 551 if (digest->length != EVP_MD_size(md)) { 552 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 553 "Bad message digest."); 554 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 555 return 0; 556 } 557 558 return 1; 559 } 560 561 /* Returns the TSA policy based on the requested and acceptable policies. */ 562 static ASN1_OBJECT * 563 TS_RESP_get_policy(TS_RESP_CTX *ctx) 564 { 565 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request); 566 ASN1_OBJECT *policy = NULL; 567 int i; 568 569 if (ctx->default_policy == NULL) { 570 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER); 571 return NULL; 572 } 573 /* Return the default policy if none is requested or the default is 574 requested. */ 575 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 576 policy = ctx->default_policy; 577 578 /* Check if the policy is acceptable. */ 579 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 580 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 581 if (!OBJ_cmp(requested, current)) 582 policy = current; 583 } 584 if (!policy) { 585 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY); 586 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 587 "Requested policy is not " 588 "supported."); 589 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 590 } 591 return policy; 592 } 593 594 /* Creates the TS_TST_INFO object based on the settings of the context. */ 595 static TS_TST_INFO * 596 TS_RESP_create_tst_info(TS_RESP_CTX *ctx, ASN1_OBJECT *policy) 597 { 598 int result = 0; 599 TS_TST_INFO *tst_info = NULL; 600 ASN1_INTEGER *serial = NULL; 601 ASN1_GENERALIZEDTIME *asn1_time = NULL; 602 time_t sec; 603 long usec; 604 TS_ACCURACY *accuracy = NULL; 605 const ASN1_INTEGER *nonce; 606 GENERAL_NAME *tsa_name = NULL; 607 608 if (!(tst_info = TS_TST_INFO_new())) 609 goto end; 610 if (!TS_TST_INFO_set_version(tst_info, 1)) 611 goto end; 612 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 613 goto end; 614 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 615 goto end; 616 if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data)) || 617 !TS_TST_INFO_set_serial(tst_info, serial)) 618 goto end; 619 if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec) || 620 !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, sec, usec, 621 ctx->clock_precision_digits)) || 622 !TS_TST_INFO_set_time(tst_info, asn1_time)) 623 goto end; 624 625 /* Setting accuracy if needed. */ 626 if ((ctx->seconds || ctx->millis || ctx->micros) && 627 !(accuracy = TS_ACCURACY_new())) 628 goto end; 629 630 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 631 goto end; 632 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 633 goto end; 634 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 635 goto end; 636 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 637 goto end; 638 639 /* Setting ordering. */ 640 if ((ctx->flags & TS_ORDERING) && 641 !TS_TST_INFO_set_ordering(tst_info, 1)) 642 goto end; 643 644 /* Setting nonce if needed. */ 645 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL && 646 !TS_TST_INFO_set_nonce(tst_info, nonce)) 647 goto end; 648 649 /* Setting TSA name to subject of signer certificate. */ 650 if (ctx->flags & TS_TSA_NAME) { 651 if (!(tsa_name = GENERAL_NAME_new())) 652 goto end; 653 tsa_name->type = GEN_DIRNAME; 654 tsa_name->d.dirn = 655 X509_NAME_dup(ctx->signer_cert->cert_info->subject); 656 if (!tsa_name->d.dirn) 657 goto end; 658 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 659 goto end; 660 } 661 662 result = 1; 663 664 end: 665 if (!result) { 666 TS_TST_INFO_free(tst_info); 667 tst_info = NULL; 668 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR); 669 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 670 "Error during TSTInfo " 671 "generation."); 672 } 673 GENERAL_NAME_free(tsa_name); 674 TS_ACCURACY_free(accuracy); 675 ASN1_GENERALIZEDTIME_free(asn1_time); 676 ASN1_INTEGER_free(serial); 677 678 return tst_info; 679 } 680 681 /* Processing the extensions of the request. */ 682 static int 683 TS_RESP_process_extensions(TS_RESP_CTX *ctx) 684 { 685 STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request); 686 int i; 687 int ok = 1; 688 689 for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) { 690 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i); 691 /* XXXXX The last argument was previously 692 (void *)ctx->extension_cb, but ISO C doesn't permit 693 converting a function pointer to void *. For lack of 694 better information, I'm placing a NULL there instead. 695 The callback can pick its own address out from the ctx 696 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. */ 705 static int 706 TS_RESP_sign(TS_RESP_CTX *ctx) 707 { 708 int ret = 0; 709 PKCS7 *p7 = NULL; 710 PKCS7_SIGNER_INFO *si; 711 STACK_OF(X509) *certs; /* Certificates to include in sc. */ 712 ESS_SIGNING_CERT *sc = NULL; 713 ASN1_OBJECT *oid; 714 BIO *p7bio = NULL; 715 int i; 716 717 /* Check if signcert and pkey match. */ 718 if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) { 719 TSerr(TS_F_TS_RESP_SIGN, 720 TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 721 goto err; 722 } 723 724 /* Create a new PKCS7 signed object. */ 725 if (!(p7 = PKCS7_new())) { 726 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 727 goto err; 728 } 729 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 730 goto err; 731 732 /* Force SignedData version to be 3 instead of the default 1. */ 733 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 734 goto err; 735 736 /* Add signer certificate and optional certificate chain. */ 737 if (TS_REQ_get_cert_req(ctx->request)) { 738 PKCS7_add_certificate(p7, ctx->signer_cert); 739 if (ctx->certs) { 740 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 741 X509 *cert = sk_X509_value(ctx->certs, i); 742 PKCS7_add_certificate(p7, cert); 743 } 744 } 745 } 746 747 /* Add a new signer info. */ 748 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert, 749 ctx->signer_key, EVP_sha1()))) { 750 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR); 751 goto err; 752 } 753 754 /* Add content type signed attribute to the signer info. */ 755 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 756 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 757 V_ASN1_OBJECT, oid)) { 758 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 759 goto err; 760 } 761 762 /* Create the ESS SigningCertificate attribute which contains 763 the signer certificate id and optionally the certificate chain. */ 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; 802 803 err: 804 if (!ret) 805 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 806 "Error during signature " 807 "generation."); 808 BIO_free_all(p7bio); 809 ESS_SIGNING_CERT_free(sc); 810 PKCS7_free(p7); 811 return ret; 812 } 813 814 static ESS_SIGNING_CERT * 815 ESS_SIGNING_CERT_new_init(X509 *signcert, STACK_OF(X509) *certs) 816 { 817 ESS_CERT_ID *cid; 818 ESS_SIGNING_CERT *sc = NULL; 819 int i; 820 821 /* Creating the ESS_CERT_ID stack. */ 822 if (!(sc = ESS_SIGNING_CERT_new())) 823 goto err; 824 if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null())) 825 goto err; 826 827 /* Adding the signing certificate id. */ 828 if (!(cid = ESS_CERT_ID_new_init(signcert, 0)) || 829 !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 830 goto err; 831 /* Adding the certificate chain ids. */ 832 for (i = 0; i < sk_X509_num(certs); ++i) { 833 X509 *cert = sk_X509_value(certs, i); 834 if (!(cid = ESS_CERT_ID_new_init(cert, 1)) || 835 !sk_ESS_CERT_ID_push(sc->cert_ids, cid)) 836 goto err; 837 } 838 839 return sc; 840 841 err: 842 ESS_SIGNING_CERT_free(sc); 843 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE); 844 return NULL; 845 } 846 847 static ESS_CERT_ID * 848 ESS_CERT_ID_new_init(X509 *cert, int issuer_needed) 849 { 850 ESS_CERT_ID *cid = NULL; 851 GENERAL_NAME *name = NULL; 852 853 /* Recompute SHA1 hash of certificate if necessary (side effect). */ 854 X509_check_purpose(cert, -1, 0); 855 856 if (!(cid = ESS_CERT_ID_new())) 857 goto err; 858 if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash, 859 sizeof(cert->sha1_hash))) 860 goto err; 861 862 /* Setting the issuer/serial if requested. */ 863 if (issuer_needed) { 864 /* Creating issuer/serial structure. */ 865 if (!cid->issuer_serial && 866 !(cid->issuer_serial = ESS_ISSUER_SERIAL_new())) 867 goto err; 868 /* Creating general name from the certificate issuer. */ 869 if (!(name = GENERAL_NAME_new())) 870 goto err; 871 name->type = GEN_DIRNAME; 872 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer))) 873 goto err; 874 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 875 goto err; 876 name = NULL; /* Ownership is lost. */ 877 /* Setting the serial number. */ 878 ASN1_INTEGER_free(cid->issuer_serial->serial); 879 if (!(cid->issuer_serial->serial = 880 ASN1_INTEGER_dup(cert->cert_info->serialNumber))) 881 goto err; 882 } 883 884 return cid; 885 886 err: 887 GENERAL_NAME_free(name); 888 ESS_CERT_ID_free(cid); 889 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE); 890 return NULL; 891 } 892 893 static int 894 TS_TST_INFO_content_new(PKCS7 *p7) 895 { 896 PKCS7 *ret = NULL; 897 ASN1_OCTET_STRING *octet_string = NULL; 898 899 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 900 if (!(ret = PKCS7_new())) 901 goto err; 902 if (!(ret->d.other = ASN1_TYPE_new())) 903 goto err; 904 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 905 if (!(octet_string = ASN1_OCTET_STRING_new())) 906 goto err; 907 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 908 octet_string = NULL; 909 910 /* Add encapsulated content to signed PKCS7 structure. */ 911 if (!PKCS7_set_content(p7, ret)) 912 goto err; 913 914 return 1; 915 916 err: 917 ASN1_OCTET_STRING_free(octet_string); 918 PKCS7_free(ret); 919 return 0; 920 } 921 922 static int 923 ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 924 { 925 ASN1_STRING *seq = NULL; 926 unsigned char *p, *pp = NULL; 927 int len; 928 929 len = i2d_ESS_SIGNING_CERT(sc, NULL); 930 if (!(pp = malloc(len))) { 931 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 932 goto err; 933 } 934 p = pp; 935 i2d_ESS_SIGNING_CERT(sc, &p); 936 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) { 937 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 938 goto err; 939 } 940 free(pp); 941 pp = NULL; 942 return PKCS7_add_signed_attribute(si, 943 NID_id_smime_aa_signingCertificate, V_ASN1_SEQUENCE, seq); 944 945 err: 946 ASN1_STRING_free(seq); 947 free(pp); 948 949 return 0; 950 } 951 952 953 static ASN1_GENERALIZEDTIME * 954 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 955 time_t sec, long usec, unsigned precision) 956 { 957 struct tm *tm = NULL; 958 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 959 char usecstr[TS_MAX_CLOCK_PRECISION_DIGITS + 2]; 960 char *p; 961 int rv; 962 963 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 964 goto err; 965 966 if (!(tm = gmtime(&sec))) 967 goto err; 968 969 /* 970 * Put "genTime_str" in GeneralizedTime format. We work around the 971 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 972 * NOT include fractional seconds") and OpenSSL related functions to 973 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 974 * fraction-of-second details". 975 */ 976 if (precision > 0) { 977 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides 978 the following restrictions for a DER-encoding, which OpenSSL 979 (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 980 support: 981 "The encoding MUST terminate with a "Z" (which means "Zulu" 982 time). The decimal point element, if present, MUST be the 983 point option ".". The fractional-seconds elements, 984 if present, MUST omit all trailing 0's; 985 if the elements correspond to 0, they MUST be wholly 986 omitted, and the decimal point element also MUST be 987 omitted." */ 988 (void) snprintf(usecstr, sizeof(usecstr), ".%06ld", usec); 989 /* truncate and trim trailing 0 */ 990 usecstr[precision + 1] = '\0'; 991 p = usecstr + strlen(usecstr) - 1; 992 while (p > usecstr && *p == '0') 993 *p-- = '\0'; 994 /* if we've reached the beginning, delete the . too */ 995 if (p == usecstr) 996 *p = '\0'; 997 998 } else { 999 /* empty */ 1000 usecstr[0] = '\0'; 1001 } 1002 rv = snprintf(genTime_str, sizeof(genTime_str), 1003 "%04d%02d%02d%02d%02d%02d%sZ", 1004 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 1005 tm->tm_hour, tm->tm_min, tm->tm_sec, usecstr); 1006 if (rv == -1 || rv >= sizeof(genTime_str)) 1007 goto err; 1008 1009 /* Now call OpenSSL to check and set our genTime value */ 1010 if (!asn1_time && !(asn1_time = ASN1_GENERALIZEDTIME_new())) 1011 goto err; 1012 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1013 ASN1_GENERALIZEDTIME_free(asn1_time); 1014 goto err; 1015 } 1016 1017 return asn1_time; 1018 1019 err: 1020 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME); 1021 return NULL; 1022 } 1023