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) 2006-2018 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 #include "o_time.h" 62 63 #if defined(OPENSSL_SYS_UNIX) 64 # include <sys/time.h> 65 #endif 66 67 #include <openssl/objects.h> 68 #include <openssl/ts.h> 69 #include <openssl/pkcs7.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 *, long *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 93 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long, 94 unsigned); 95 96 /* Default callbacks for response generation. */ 97 98 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data) 99 { 100 ASN1_INTEGER *serial = ASN1_INTEGER_new(); 101 if (!serial) 102 goto err; 103 if (!ASN1_INTEGER_set(serial, 1)) 104 goto err; 105 return serial; 106 err: 107 TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE); 108 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 109 "Error during serial number generation."); 110 return NULL; 111 } 112 113 #if defined(OPENSSL_SYS_UNIX) 114 115 /* Use the gettimeofday function call. */ 116 static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 117 long *sec, long *usec) 118 { 119 struct timeval tv; 120 if (gettimeofday(&tv, NULL) != 0) { 121 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 122 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 123 "Time is not available."); 124 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 125 return 0; 126 } 127 /* Return time to caller. */ 128 *sec = tv.tv_sec; 129 *usec = tv.tv_usec; 130 131 return 1; 132 } 133 134 #else 135 136 /* Use the time function call that provides only seconds precision. */ 137 static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 138 long *sec, long *usec) 139 { 140 time_t t; 141 if (time(&t) == (time_t)-1) { 142 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR); 143 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 144 "Time is not available."); 145 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE); 146 return 0; 147 } 148 /* Return time to caller, only second precision. */ 149 *sec = (long)t; 150 *usec = 0; 151 152 return 1; 153 } 154 155 #endif 156 157 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext, 158 void *data) 159 { 160 /* No extensions are processed here. */ 161 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 162 "Unsupported extension."); 163 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION); 164 return 0; 165 } 166 167 /* TS_RESP_CTX management functions. */ 168 169 TS_RESP_CTX *TS_RESP_CTX_new() 170 { 171 TS_RESP_CTX *ctx; 172 173 if (!(ctx = (TS_RESP_CTX *)OPENSSL_malloc(sizeof(TS_RESP_CTX)))) { 174 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE); 175 return NULL; 176 } 177 memset(ctx, 0, sizeof(TS_RESP_CTX)); 178 179 /* Setting default callbacks. */ 180 ctx->serial_cb = def_serial_cb; 181 ctx->time_cb = def_time_cb; 182 ctx->extension_cb = def_extension_cb; 183 184 return ctx; 185 } 186 187 void TS_RESP_CTX_free(TS_RESP_CTX *ctx) 188 { 189 if (!ctx) 190 return; 191 192 X509_free(ctx->signer_cert); 193 EVP_PKEY_free(ctx->signer_key); 194 sk_X509_pop_free(ctx->certs, X509_free); 195 sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free); 196 ASN1_OBJECT_free(ctx->default_policy); 197 sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */ 198 ASN1_INTEGER_free(ctx->seconds); 199 ASN1_INTEGER_free(ctx->millis); 200 ASN1_INTEGER_free(ctx->micros); 201 OPENSSL_free(ctx); 202 } 203 204 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer) 205 { 206 if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) { 207 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 208 TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE); 209 return 0; 210 } 211 if (ctx->signer_cert) 212 X509_free(ctx->signer_cert); 213 ctx->signer_cert = signer; 214 CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509); 215 return 1; 216 } 217 218 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key) 219 { 220 if (ctx->signer_key) 221 EVP_PKEY_free(ctx->signer_key); 222 ctx->signer_key = key; 223 CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY); 224 225 return 1; 226 } 227 228 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy) 229 { 230 if (ctx->default_policy) 231 ASN1_OBJECT_free(ctx->default_policy); 232 if (!(ctx->default_policy = OBJ_dup(def_policy))) 233 goto err; 234 return 1; 235 err: 236 TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE); 237 return 0; 238 } 239 240 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs) 241 { 242 243 if (ctx->certs) { 244 sk_X509_pop_free(ctx->certs, X509_free); 245 ctx->certs = NULL; 246 } 247 if (!certs) 248 return 1; 249 if (!(ctx->certs = X509_chain_up_ref(certs))) { 250 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE); 251 return 0; 252 } 253 254 return 1; 255 } 256 257 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy) 258 { 259 ASN1_OBJECT *copy = NULL; 260 261 /* Create new policy stack if necessary. */ 262 if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 263 goto err; 264 if (!(copy = OBJ_dup(policy))) 265 goto err; 266 if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) 267 goto err; 268 269 return 1; 270 err: 271 TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE); 272 ASN1_OBJECT_free(copy); 273 return 0; 274 } 275 276 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md) 277 { 278 /* Create new md stack if necessary. */ 279 if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 280 goto err; 281 /* Add the shared md, no copy needed. */ 282 if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) 283 goto err; 284 285 return 1; 286 err: 287 TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE); 288 return 0; 289 } 290 291 #define TS_RESP_CTX_accuracy_free(ctx) \ 292 ASN1_INTEGER_free(ctx->seconds); \ 293 ctx->seconds = NULL; \ 294 ASN1_INTEGER_free(ctx->millis); \ 295 ctx->millis = NULL; \ 296 ASN1_INTEGER_free(ctx->micros); \ 297 ctx->micros = NULL; 298 299 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 300 int secs, int millis, int micros) 301 { 302 303 TS_RESP_CTX_accuracy_free(ctx); 304 if (secs && (!(ctx->seconds = ASN1_INTEGER_new()) 305 || !ASN1_INTEGER_set(ctx->seconds, secs))) 306 goto err; 307 if (millis && (!(ctx->millis = ASN1_INTEGER_new()) 308 || !ASN1_INTEGER_set(ctx->millis, millis))) 309 goto err; 310 if (micros && (!(ctx->micros = ASN1_INTEGER_new()) 311 || !ASN1_INTEGER_set(ctx->micros, micros))) 312 goto err; 313 314 return 1; 315 err: 316 TS_RESP_CTX_accuracy_free(ctx); 317 TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE); 318 return 0; 319 } 320 321 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags) 322 { 323 ctx->flags |= flags; 324 } 325 326 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data) 327 { 328 ctx->serial_cb = cb; 329 ctx->serial_cb_data = data; 330 } 331 332 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data) 333 { 334 ctx->time_cb = cb; 335 ctx->time_cb_data = data; 336 } 337 338 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 339 TS_extension_cb cb, void *data) 340 { 341 ctx->extension_cb = cb; 342 ctx->extension_cb_data = data; 343 } 344 345 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 346 int status, const char *text) 347 { 348 TS_STATUS_INFO *si = NULL; 349 ASN1_UTF8STRING *utf8_text = NULL; 350 int ret = 0; 351 352 if (!(si = TS_STATUS_INFO_new())) 353 goto err; 354 if (!ASN1_INTEGER_set(si->status, status)) 355 goto err; 356 if (text) { 357 if (!(utf8_text = ASN1_UTF8STRING_new()) 358 || !ASN1_STRING_set(utf8_text, text, strlen(text))) 359 goto err; 360 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null())) 361 goto err; 362 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) 363 goto err; 364 utf8_text = NULL; /* Ownership is lost. */ 365 } 366 if (!TS_RESP_set_status_info(ctx->response, si)) 367 goto err; 368 ret = 1; 369 err: 370 if (!ret) 371 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE); 372 TS_STATUS_INFO_free(si); 373 ASN1_UTF8STRING_free(utf8_text); 374 return ret; 375 } 376 377 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 378 int status, const char *text) 379 { 380 int ret = 1; 381 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 382 383 if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) { 384 /* Status has not been set, set it now. */ 385 ret = TS_RESP_CTX_set_status_info(ctx, status, text); 386 } 387 return ret; 388 } 389 390 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure) 391 { 392 TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response); 393 if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new())) 394 goto err; 395 if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1)) 396 goto err; 397 return 1; 398 err: 399 TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE); 400 return 0; 401 } 402 403 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx) 404 { 405 return ctx->request; 406 } 407 408 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx) 409 { 410 return ctx->tst_info; 411 } 412 413 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, 414 unsigned precision) 415 { 416 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 417 return 0; 418 ctx->clock_precision_digits = precision; 419 return 1; 420 } 421 422 /* Main entry method of the response generation. */ 423 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio) 424 { 425 ASN1_OBJECT *policy; 426 TS_RESP *response; 427 int result = 0; 428 429 TS_RESP_CTX_init(ctx); 430 431 /* Creating the response object. */ 432 if (!(ctx->response = TS_RESP_new())) { 433 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE); 434 goto end; 435 } 436 437 /* Parsing DER request. */ 438 if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) { 439 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 440 "Bad request format or " "system error."); 441 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 442 goto end; 443 } 444 445 /* Setting default status info. */ 446 if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL)) 447 goto end; 448 449 /* Checking the request format. */ 450 if (!TS_RESP_check_request(ctx)) 451 goto end; 452 453 /* Checking acceptable policies. */ 454 if (!(policy = TS_RESP_get_policy(ctx))) 455 goto end; 456 457 /* Creating the TS_TST_INFO object. */ 458 if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy))) 459 goto end; 460 461 /* Processing extensions. */ 462 if (!TS_RESP_process_extensions(ctx)) 463 goto end; 464 465 /* Generating the signature. */ 466 if (!TS_RESP_sign(ctx)) 467 goto end; 468 469 /* Everything was successful. */ 470 result = 1; 471 end: 472 if (!result) { 473 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR); 474 if (ctx->response != NULL) { 475 if (TS_RESP_CTX_set_status_info_cond(ctx, 476 TS_STATUS_REJECTION, 477 "Error during response " 478 "generation.") == 0) { 479 TS_RESP_free(ctx->response); 480 ctx->response = NULL; 481 } 482 } 483 } 484 response = ctx->response; 485 ctx->response = NULL; /* Ownership will be returned to caller. */ 486 TS_RESP_CTX_cleanup(ctx); 487 return response; 488 } 489 490 /* Initializes the variable part of the context. */ 491 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx) 492 { 493 ctx->request = NULL; 494 ctx->response = NULL; 495 ctx->tst_info = NULL; 496 } 497 498 /* Cleans up the variable part of the context. */ 499 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx) 500 { 501 TS_REQ_free(ctx->request); 502 ctx->request = NULL; 503 TS_RESP_free(ctx->response); 504 ctx->response = NULL; 505 TS_TST_INFO_free(ctx->tst_info); 506 ctx->tst_info = NULL; 507 } 508 509 /* Checks the format and content of the request. */ 510 static int TS_RESP_check_request(TS_RESP_CTX *ctx) 511 { 512 TS_REQ *request = ctx->request; 513 TS_MSG_IMPRINT *msg_imprint; 514 X509_ALGOR *md_alg; 515 int md_alg_id; 516 const ASN1_OCTET_STRING *digest; 517 EVP_MD *md = NULL; 518 int i; 519 520 /* Checking request version. */ 521 if (TS_REQ_get_version(request) != 1) { 522 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 523 "Bad request version."); 524 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST); 525 return 0; 526 } 527 528 /* Checking message digest algorithm. */ 529 msg_imprint = TS_REQ_get_msg_imprint(request); 530 md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint); 531 md_alg_id = OBJ_obj2nid(md_alg->algorithm); 532 for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) { 533 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i); 534 if (md_alg_id == EVP_MD_type(current_md)) 535 md = current_md; 536 } 537 if (!md) { 538 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 539 "Message digest algorithm is " 540 "not supported."); 541 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 542 return 0; 543 } 544 545 /* No message digest takes parameter. */ 546 if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) { 547 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 548 "Superfluous message digest " 549 "parameter."); 550 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG); 551 return 0; 552 } 553 /* Checking message digest size. */ 554 digest = TS_MSG_IMPRINT_get_msg(msg_imprint); 555 if (digest->length != EVP_MD_size(md)) { 556 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 557 "Bad message digest."); 558 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT); 559 return 0; 560 } 561 562 return 1; 563 } 564 565 /* Returns the TSA policy based on the requested and acceptable policies. */ 566 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx) 567 { 568 ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request); 569 ASN1_OBJECT *policy = NULL; 570 int i; 571 572 if (ctx->default_policy == NULL) { 573 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER); 574 return NULL; 575 } 576 /* 577 * Return the default policy if none is requested or the default is 578 * requested. 579 */ 580 if (!requested || !OBJ_cmp(requested, ctx->default_policy)) 581 policy = ctx->default_policy; 582 583 /* Check if the policy is acceptable. */ 584 for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) { 585 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i); 586 if (!OBJ_cmp(requested, current)) 587 policy = current; 588 } 589 if (!policy) { 590 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY); 591 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 592 "Requested policy is not " "supported."); 593 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY); 594 } 595 return policy; 596 } 597 598 /* Creates the TS_TST_INFO object based on the settings of the context. */ 599 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 600 ASN1_OBJECT *policy) 601 { 602 int result = 0; 603 TS_TST_INFO *tst_info = NULL; 604 ASN1_INTEGER *serial = NULL; 605 ASN1_GENERALIZEDTIME *asn1_time = NULL; 606 long sec, usec; 607 TS_ACCURACY *accuracy = NULL; 608 const ASN1_INTEGER *nonce; 609 GENERAL_NAME *tsa_name = NULL; 610 611 if (!(tst_info = TS_TST_INFO_new())) 612 goto end; 613 if (!TS_TST_INFO_set_version(tst_info, 1)) 614 goto end; 615 if (!TS_TST_INFO_set_policy_id(tst_info, policy)) 616 goto end; 617 if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint)) 618 goto end; 619 if (!(serial = (*ctx->serial_cb) (ctx, ctx->serial_cb_data)) 620 || !TS_TST_INFO_set_serial(tst_info, serial)) 621 goto end; 622 if (!(*ctx->time_cb) (ctx, ctx->time_cb_data, &sec, &usec) 623 || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, 624 sec, usec, 625 ctx->clock_precision_digits)) 626 || !TS_TST_INFO_set_time(tst_info, asn1_time)) 627 goto end; 628 629 /* Setting accuracy if needed. */ 630 if ((ctx->seconds || ctx->millis || ctx->micros) 631 && !(accuracy = TS_ACCURACY_new())) 632 goto end; 633 634 if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds)) 635 goto end; 636 if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis)) 637 goto end; 638 if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros)) 639 goto end; 640 if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 641 goto end; 642 643 /* Setting ordering. */ 644 if ((ctx->flags & TS_ORDERING) 645 && !TS_TST_INFO_set_ordering(tst_info, 1)) 646 goto end; 647 648 /* Setting nonce if needed. */ 649 if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL 650 && !TS_TST_INFO_set_nonce(tst_info, nonce)) 651 goto end; 652 653 /* Setting TSA name to subject of signer certificate. */ 654 if (ctx->flags & TS_TSA_NAME) { 655 if (!(tsa_name = GENERAL_NAME_new())) 656 goto end; 657 tsa_name->type = GEN_DIRNAME; 658 tsa_name->d.dirn = 659 X509_NAME_dup(ctx->signer_cert->cert_info->subject); 660 if (!tsa_name->d.dirn) 661 goto end; 662 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) 663 goto end; 664 } 665 666 result = 1; 667 end: 668 if (!result) { 669 TS_TST_INFO_free(tst_info); 670 tst_info = NULL; 671 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR); 672 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION, 673 "Error during TSTInfo " 674 "generation."); 675 } 676 GENERAL_NAME_free(tsa_name); 677 TS_ACCURACY_free(accuracy); 678 ASN1_GENERALIZEDTIME_free(asn1_time); 679 ASN1_INTEGER_free(serial); 680 681 return tst_info; 682 } 683 684 /* Processing the extensions of the request. */ 685 static int 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 /* 694 * XXXXX The last argument was previously (void *)ctx->extension_cb, 695 * but ISO C doesn't permit converting a function pointer to void *. 696 * For lack of better information, I'm placing a NULL there instead. 697 * The callback can pick its own address out from the ctx anyway... 698 */ 699 ok = (*ctx->extension_cb) (ctx, ext, NULL); 700 } 701 702 return ok; 703 } 704 705 /* Functions for signing the TS_TST_INFO structure of the context. */ 706 static int 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, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 720 goto err; 721 } 722 723 /* Create a new PKCS7 signed object. */ 724 if (!(p7 = PKCS7_new())) { 725 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE); 726 goto err; 727 } 728 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 729 goto err; 730 731 /* Force SignedData version to be 3 instead of the default 1. */ 732 if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) 733 goto err; 734 735 /* Add signer certificate and optional certificate chain. */ 736 if (TS_REQ_get_cert_req(ctx->request)) { 737 PKCS7_add_certificate(p7, ctx->signer_cert); 738 if (ctx->certs) { 739 for (i = 0; i < sk_X509_num(ctx->certs); ++i) { 740 X509 *cert = sk_X509_value(ctx->certs, i); 741 PKCS7_add_certificate(p7, cert); 742 } 743 } 744 } 745 746 /* Add a new signer info. */ 747 if (!(si = PKCS7_add_signature(p7, ctx->signer_cert, 748 ctx->signer_key, EVP_sha1()))) { 749 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR); 750 goto err; 751 } 752 753 /* Add content type signed attribute to the signer info. */ 754 oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 755 if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 756 V_ASN1_OBJECT, oid)) { 757 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR); 758 goto err; 759 } 760 761 /* 762 * Create the ESS SigningCertificate attribute which contains the signer 763 * certificate id and optionally the certificate chain. 764 */ 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 TSerr(TS_F_TS_RESP_SIGN, 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 TSerr(TS_F_TS_RESP_SIGN, 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 TSerr(TS_F_TS_RESP_SIGN, 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 TSerr(TS_F_TS_RESP_SIGN, 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 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 *ESS_SIGNING_CERT_new_init(X509 *signcert, 815 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 err: 841 ESS_SIGNING_CERT_free(sc); 842 TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE); 843 return NULL; 844 } 845 846 static ESS_CERT_ID *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 err: 884 GENERAL_NAME_free(name); 885 ESS_CERT_ID_free(cid); 886 TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE); 887 return NULL; 888 } 889 890 static int TS_TST_INFO_content_new(PKCS7 *p7) 891 { 892 PKCS7 *ret = NULL; 893 ASN1_OCTET_STRING *octet_string = NULL; 894 895 /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */ 896 if (!(ret = PKCS7_new())) 897 goto err; 898 if (!(ret->d.other = ASN1_TYPE_new())) 899 goto err; 900 ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo); 901 if (!(octet_string = ASN1_OCTET_STRING_new())) 902 goto err; 903 ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string); 904 octet_string = NULL; 905 906 /* Add encapsulated content to signed PKCS7 structure. */ 907 if (!PKCS7_set_content(p7, ret)) 908 goto err; 909 910 return 1; 911 err: 912 ASN1_OCTET_STRING_free(octet_string); 913 PKCS7_free(ret); 914 return 0; 915 } 916 917 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc) 918 { 919 ASN1_STRING *seq = NULL; 920 unsigned char *p, *pp = NULL; 921 int len; 922 923 len = i2d_ESS_SIGNING_CERT(sc, NULL); 924 if (!(pp = (unsigned char *)OPENSSL_malloc(len))) { 925 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 926 goto err; 927 } 928 p = pp; 929 i2d_ESS_SIGNING_CERT(sc, &p); 930 if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) { 931 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE); 932 goto err; 933 } 934 OPENSSL_free(pp); 935 pp = NULL; 936 return PKCS7_add_signed_attribute(si, 937 NID_id_smime_aa_signingCertificate, 938 V_ASN1_SEQUENCE, seq); 939 err: 940 ASN1_STRING_free(seq); 941 OPENSSL_free(pp); 942 943 return 0; 944 } 945 946 static ASN1_GENERALIZEDTIME 947 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 948 long sec, long usec, unsigned precision) 949 { 950 time_t time_sec = (time_t)sec; 951 struct tm *tm = NULL; 952 struct tm result = {0}; 953 char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS]; 954 char *p = genTime_str; 955 char *p_end = genTime_str + sizeof(genTime_str); 956 957 if (precision > TS_MAX_CLOCK_PRECISION_DIGITS) 958 goto err; 959 960 if (!(tm = OPENSSL_gmtime(&time_sec, &result))) 961 goto err; 962 963 /* 964 * Put "genTime_str" in GeneralizedTime format. We work around the 965 * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 966 * NOT include fractional seconds") and OpenSSL related functions to 967 * meet the rfc3161 requirement: "GeneralizedTime syntax can include 968 * fraction-of-second details". 969 */ 970 p += BIO_snprintf(p, p_end - p, 971 "%04d%02d%02d%02d%02d%02d", 972 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 973 tm->tm_hour, tm->tm_min, tm->tm_sec); 974 if (precision > 0) { 975 /* Add fraction of seconds (leave space for dot and null). */ 976 BIO_snprintf(p, 2 + precision, ".%06ld", usec); 977 /* 978 * We cannot use the snprintf return value, because it might have 979 * been truncated. 980 */ 981 p += strlen(p); 982 983 /* 984 * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the 985 * following restrictions for a DER-encoding, which OpenSSL 986 * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 987 * support: "The encoding MUST terminate with a "Z" (which means 988 * "Zulu" time). The decimal point element, if present, MUST be the 989 * point option ".". The fractional-seconds elements, if present, 990 * MUST omit all trailing 0's; if the elements correspond to 0, they 991 * MUST be wholly omitted, and the decimal point element also MUST be 992 * omitted." 993 */ 994 /* 995 * Remove trailing zeros. The dot guarantees the exit condition of 996 * this loop even if all the digits are zero. 997 */ 998 while (*--p == '0') 999 /* 1000 * empty 1001 */ ; 1002 /* p points to either the dot or the last non-zero digit. */ 1003 if (*p != '.') 1004 ++p; 1005 } 1006 /* Add the trailing Z and the terminating null. */ 1007 *p++ = 'Z'; 1008 *p++ = '\0'; 1009 1010 /* Now call OpenSSL to check and set our genTime value */ 1011 if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new())) 1012 goto err; 1013 if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) { 1014 ASN1_GENERALIZEDTIME_free(asn1_time); 1015 goto err; 1016 } 1017 1018 return asn1_time; 1019 err: 1020 TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME); 1021 return NULL; 1022 } 1023