1 /* $OpenBSD: ts.c,v 1.24 2022/09/11 18:08:17 tb Exp $ */ 2 /* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL 3 * project 2002. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2001 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 <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include "apps.h" 64 65 #include <openssl/bio.h> 66 #include <openssl/bn.h> 67 #include <openssl/err.h> 68 #include <openssl/pem.h> 69 #include <openssl/ts.h> 70 71 /* Length of the nonce of the request in bits (must be a multiple of 8). */ 72 #define NONCE_LENGTH 64 73 74 /* Macro definitions for the configuration file. */ 75 #define ENV_OID_FILE "oid_file" 76 77 /* Local function declarations. */ 78 79 static ASN1_OBJECT *txt2obj(const char *oid); 80 static CONF *load_config_file(const char *configfile); 81 82 /* Query related functions. */ 83 static int query_command(const char *data, char *digest, const EVP_MD *md, 84 const char *policy, int no_nonce, int cert, const char *in, const char *out, 85 int text); 86 static BIO *BIO_open_with_default(const char *file, const char *mode, 87 FILE *default_fp); 88 static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md, 89 const char *policy, int no_nonce, int cert); 90 static int create_digest(BIO *input, char *digest, const EVP_MD *md, 91 unsigned char **md_value); 92 static ASN1_INTEGER *create_nonce(int bits); 93 94 /* Reply related functions. */ 95 static int reply_command(CONF *conf, char *section, char *queryfile, 96 char *passin, char *inkey, char *signer, char *chain, const char *policy, 97 char *in, int token_in, char *out, int token_out, int text); 98 static TS_RESP *read_PKCS7(BIO *in_bio); 99 static TS_RESP *create_response(CONF *conf, const char *section, 100 char *queryfile, char *passin, char *inkey, char *signer, char *chain, 101 const char *policy); 102 static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data); 103 static ASN1_INTEGER *next_serial(const char *serialfile); 104 static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial); 105 106 /* Verify related functions. */ 107 static int verify_command(char *data, char *digest, char *queryfile, char *in, 108 int token_in, char *ca_path, char *ca_file, char *untrusted); 109 static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest, 110 char *queryfile, char *ca_path, char *ca_file, char *untrusted); 111 static X509_STORE *create_cert_store(char *ca_path, char *ca_file); 112 static int verify_cb(int ok, X509_STORE_CTX *ctx); 113 114 enum mode { 115 CMD_NONE, CMD_QUERY, CMD_REPLY, CMD_VERIFY 116 }; 117 118 static struct { 119 char *ca_file; 120 char *ca_path; 121 int cert; 122 char *chain; 123 char *configfile; 124 char *data; 125 char *digest; 126 char *in; 127 char *inkey; 128 const EVP_MD *md; 129 int mode; 130 int no_nonce; 131 char *out; 132 char *passin; 133 char *policy; 134 char *queryfile; 135 char *section; 136 char *signer; 137 int text; 138 int token_in; 139 int token_out; 140 char *untrusted; 141 } ts_config; 142 143 static int 144 ts_opt_md(int argc, char **argv, int *argsused) 145 { 146 char *name = argv[0]; 147 148 if (*name++ != '-') 149 return (1); 150 151 if ((ts_config.md = EVP_get_digestbyname(name)) == NULL) 152 return (1); 153 154 *argsused = 1; 155 return (0); 156 } 157 158 static int 159 ts_opt_query(void) 160 { 161 if (ts_config.mode != CMD_NONE) 162 return (1); 163 ts_config.mode = CMD_QUERY; 164 return (0); 165 } 166 167 static int 168 ts_opt_reply(void) 169 { 170 if (ts_config.mode != CMD_NONE) 171 return (1); 172 ts_config.mode = CMD_REPLY; 173 return (0); 174 } 175 176 static int 177 ts_opt_verify(void) 178 { 179 if (ts_config.mode != CMD_NONE) 180 return (1); 181 ts_config.mode = CMD_VERIFY; 182 return (0); 183 } 184 185 static const struct option ts_options[] = { 186 { 187 .name = "CAfile", 188 .argname = "file", 189 .desc = "Certificate Authority file", 190 .type = OPTION_ARG, 191 .opt.arg = &ts_config.ca_file, 192 }, 193 { 194 .name = "CApath", 195 .argname = "path", 196 .desc = "Certificate Authority path", 197 .type = OPTION_ARG, 198 .opt.arg = &ts_config.ca_path, 199 }, 200 { 201 .name = "cert", 202 .desc = "Include signing certificate in the response", 203 .type = OPTION_FLAG, 204 .opt.flag = &ts_config.cert, 205 }, 206 { 207 .name = "chain", 208 .argname = "file", 209 .desc = "PEM certificates that will be included in the response", 210 .type = OPTION_ARG, 211 .opt.arg = &ts_config.chain, 212 }, 213 { 214 .name = "config", 215 .argname = "file", 216 .desc = "Specify an alternative configuration file", 217 .type = OPTION_ARG, 218 .opt.arg = &ts_config.configfile, 219 }, 220 { 221 .name = "data", 222 .argname = "file", 223 .desc = "Data file for which the time stamp request needs to be created", 224 .type = OPTION_ARG, 225 .opt.arg = &ts_config.data, 226 }, 227 { 228 .name = "digest", 229 .argname = "arg", 230 .desc = "Specify the message imprint explicitly without the data file", 231 .type = OPTION_ARG, 232 .opt.arg = &ts_config.digest, 233 }, 234 { 235 .name = "in", 236 .argname = "file", 237 .desc = "Input file", 238 .type = OPTION_ARG, 239 .opt.arg = &ts_config.in, 240 }, 241 { 242 .name = "inkey", 243 .argname = "file", 244 .desc = "Input key file", 245 .type = OPTION_ARG, 246 .opt.arg = &ts_config.inkey, 247 }, 248 { 249 .name = "no_nonce", 250 .desc = "Specify no nonce in the request", 251 .type = OPTION_FLAG, 252 .opt.flag = &ts_config.no_nonce, 253 }, 254 { 255 .name = "out", 256 .argname = "file", 257 .desc = "Output file", 258 .type = OPTION_ARG, 259 .opt.arg = &ts_config.out, 260 }, 261 { 262 .name = "passin", 263 .argname = "src", 264 .desc = "Private key password source", 265 .type = OPTION_ARG, 266 .opt.arg = &ts_config.passin, 267 }, 268 { 269 .name = "policy", 270 .argname = "object_id", 271 .desc = "Policy for the TSA to use when creating the time stamp token", 272 .type = OPTION_ARG, 273 .opt.arg = &ts_config.policy, 274 }, 275 { 276 .name = "query", 277 .desc = "Create and print a time stamp request", 278 .type = OPTION_FUNC, 279 .opt.func = ts_opt_query, 280 }, 281 { 282 .name = "queryfile", 283 .argname = "file", 284 .desc = "File containing a DER-encoded time stamp request", 285 .type = OPTION_ARG, 286 .opt.arg = &ts_config.queryfile, 287 }, 288 { 289 .name = "reply", 290 .desc = "Create a time stamp response", 291 .type = OPTION_FUNC, 292 .opt.func = ts_opt_reply, 293 }, 294 { 295 .name = "section", 296 .argname = "arg", 297 .desc = "TSA section containing the settings for response generation", 298 .type = OPTION_ARG, 299 .opt.arg = &ts_config.section, 300 }, 301 { 302 .name = "signer", 303 .argname = "file", 304 .desc = "Signer certificate file", 305 .type = OPTION_ARG, 306 .opt.arg = &ts_config.signer, 307 }, 308 { 309 .name = "text", 310 .desc = "Output in human-readable text format", 311 .type = OPTION_FLAG, 312 .opt.flag = &ts_config.text, 313 }, 314 { 315 .name = "token_in", 316 .desc = "Input is a DER-encoded time stamp token", 317 .type = OPTION_FLAG, 318 .opt.flag = &ts_config.token_in, 319 }, 320 { 321 .name = "token_out", 322 .desc = "Output is a DER-encoded time stamp token", 323 .type = OPTION_FLAG, 324 .opt.flag = &ts_config.token_out, 325 }, 326 { 327 .name = "untrusted", 328 .argname = "file", 329 .desc = "File containing untrusted certificates", 330 .type = OPTION_ARG, 331 .opt.arg = &ts_config.untrusted, 332 }, 333 { 334 .name = "verify", 335 .desc = "Verify a time stamp response", 336 .type = OPTION_FUNC, 337 .opt.func = ts_opt_verify, 338 }, 339 { 340 .name = NULL, 341 .desc = "", 342 .type = OPTION_ARGV_FUNC, 343 .opt.argvfunc = ts_opt_md, 344 }, 345 { NULL }, 346 }; 347 348 static void 349 ts_usage(void) 350 { 351 fprintf(stderr, "usage:\n" 352 "ts -query [-md4 | -md5 | -ripemd160 | -sha1] [-cert]\n" 353 " [-config configfile] [-data file_to_hash]\n" 354 " [-digest digest_bytes] [-in request.tsq] [-no_nonce]\n" 355 " [-out request.tsq] [-policy object_id] [-text]\n"); 356 fprintf(stderr, "\n" 357 "ts -reply [-chain certs_file.pem] [-config configfile]\n" 358 " [-in response.tsr] [-inkey private.pem] [-out response.tsr]\n" 359 " [-passin arg] [-policy object_id] [-queryfile request.tsq]\n" 360 " [-section tsa_section] [-signer tsa_cert.pem] [-text]\n" 361 " [-token_in] [-token_out]\n"); 362 fprintf(stderr, "\n" 363 "ts -verify [-CAfile trusted_certs.pem]\n" 364 " [-CApath trusted_cert_path] [-data file_to_hash]\n" 365 " [-digest digest_bytes] [-in response.tsr]\n" 366 " [-queryfile request.tsq] [-token_in]\n" 367 " [-untrusted cert_file.pem]\n"); 368 fprintf(stderr, "\n"); 369 options_usage(ts_options); 370 fprintf(stderr, "\n"); 371 } 372 373 int 374 ts_main(int argc, char **argv) 375 { 376 int ret = 1; 377 CONF *conf = NULL; 378 char *password = NULL; /* Password itself. */ 379 380 if (single_execution) { 381 if (pledge("stdio cpath wpath rpath tty", NULL) == -1) { 382 perror("pledge"); 383 exit(1); 384 } 385 } 386 387 memset(&ts_config, 0, sizeof(ts_config)); 388 ts_config.mode = CMD_NONE; 389 390 if (options_parse(argc, argv, ts_options, NULL, NULL) != 0) 391 goto usage; 392 393 /* Get the password if required. */ 394 if (ts_config.mode == CMD_REPLY && ts_config.passin != NULL && 395 !app_passwd(bio_err, ts_config.passin, NULL, &password, NULL)) { 396 BIO_printf(bio_err, "Error getting password.\n"); 397 goto cleanup; 398 } 399 /* 400 * Check consistency of parameters and execute the appropriate 401 * function. 402 */ 403 switch (ts_config.mode) { 404 case CMD_NONE: 405 goto usage; 406 case CMD_QUERY: 407 /* 408 * Data file and message imprint cannot be specified at the 409 * same time. 410 */ 411 ret = ts_config.data != NULL && ts_config.digest != NULL; 412 if (ret) 413 goto usage; 414 /* Load the config file for possible policy OIDs. */ 415 conf = load_config_file(ts_config.configfile); 416 ret = !query_command(ts_config.data, ts_config.digest, 417 ts_config.md, ts_config.policy, ts_config.no_nonce, 418 ts_config.cert, ts_config.in, ts_config.out, 419 ts_config.text); 420 break; 421 case CMD_REPLY: 422 conf = load_config_file(ts_config.configfile); 423 if (ts_config.in == NULL) { 424 ret = !(ts_config.queryfile != NULL && conf != NULL && 425 !ts_config.token_in); 426 if (ret) 427 goto usage; 428 } else { 429 /* 'in' and 'queryfile' are exclusive. */ 430 ret = !(ts_config.queryfile == NULL); 431 if (ret) 432 goto usage; 433 } 434 435 ret = !reply_command(conf, ts_config.section, 436 ts_config.queryfile, password, ts_config.inkey, 437 ts_config.signer, ts_config.chain, ts_config.policy, 438 ts_config.in, ts_config.token_in, ts_config.out, 439 ts_config.token_out, ts_config.text); 440 break; 441 case CMD_VERIFY: 442 ret = !(((ts_config.queryfile != NULL && ts_config.data == NULL && 443 ts_config.digest == NULL) || 444 (ts_config.queryfile == NULL && ts_config.data != NULL && 445 ts_config.digest == NULL) || 446 (ts_config.queryfile == NULL && ts_config.data == NULL && 447 ts_config.digest != NULL)) && 448 ts_config.in != NULL); 449 if (ret) 450 goto usage; 451 452 ret = !verify_command(ts_config.data, ts_config.digest, 453 ts_config.queryfile, ts_config.in, ts_config.token_in, 454 ts_config.ca_path, ts_config.ca_file, ts_config.untrusted); 455 } 456 457 goto cleanup; 458 459 usage: 460 ts_usage(); 461 462 cleanup: 463 /* Clean up. */ 464 NCONF_free(conf); 465 free(password); 466 OBJ_cleanup(); 467 468 return (ret); 469 } 470 471 /* 472 * Configuration file-related function definitions. 473 */ 474 475 static ASN1_OBJECT * 476 txt2obj(const char *oid) 477 { 478 ASN1_OBJECT *oid_obj = NULL; 479 480 if ((oid_obj = OBJ_txt2obj(oid, 0)) == NULL) 481 BIO_printf(bio_err, "cannot convert %s to OID\n", oid); 482 483 return oid_obj; 484 } 485 486 static CONF * 487 load_config_file(const char *configfile) 488 { 489 CONF *conf = NULL; 490 long errorline = -1; 491 492 if (configfile == NULL) 493 configfile = getenv("OPENSSL_CONF"); 494 495 if (configfile != NULL && 496 ((conf = NCONF_new(NULL)) == NULL || 497 NCONF_load(conf, configfile, &errorline) <= 0)) { 498 if (errorline <= 0) 499 BIO_printf(bio_err, "error loading the config file " 500 "'%s'\n", configfile); 501 else 502 BIO_printf(bio_err, "error on line %ld of config file " 503 "'%s'\n", errorline, configfile); 504 } 505 if (conf != NULL) { 506 const char *p; 507 508 BIO_printf(bio_err, "Using configuration from %s\n", 509 configfile); 510 p = NCONF_get_string(conf, NULL, ENV_OID_FILE); 511 if (p != NULL) { 512 BIO *oid_bio = BIO_new_file(p, "r"); 513 if (oid_bio == NULL) 514 ERR_print_errors(bio_err); 515 else { 516 OBJ_create_objects(oid_bio); 517 BIO_free_all(oid_bio); 518 } 519 } else 520 ERR_clear_error(); 521 if (!add_oid_section(bio_err, conf)) 522 ERR_print_errors(bio_err); 523 } 524 return conf; 525 } 526 527 /* 528 * Query-related method definitions. 529 */ 530 531 static int 532 query_command(const char *data, char *digest, const EVP_MD *md, 533 const char *policy, int no_nonce, int cert, const char *in, const char *out, 534 int text) 535 { 536 int ret = 0; 537 TS_REQ *query = NULL; 538 BIO *in_bio = NULL; 539 BIO *data_bio = NULL; 540 BIO *out_bio = NULL; 541 542 /* Build query object either from file or from scratch. */ 543 if (in != NULL) { 544 if ((in_bio = BIO_new_file(in, "rb")) == NULL) 545 goto end; 546 query = d2i_TS_REQ_bio(in_bio, NULL); 547 } else { 548 /* Open the file if no explicit digest bytes were specified. */ 549 if (digest == NULL && 550 (data_bio = BIO_open_with_default(data, "rb", stdin)) == NULL) 551 goto end; 552 /* Creating the query object. */ 553 query = create_query(data_bio, digest, md, 554 policy, no_nonce, cert); 555 /* Saving the random number generator state. */ 556 } 557 if (query == NULL) 558 goto end; 559 560 /* Write query either in ASN.1 or in text format. */ 561 if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL) 562 goto end; 563 if (text) { 564 /* Text output. */ 565 if (!TS_REQ_print_bio(out_bio, query)) 566 goto end; 567 } else { 568 /* ASN.1 output. */ 569 if (!i2d_TS_REQ_bio(out_bio, query)) 570 goto end; 571 } 572 573 ret = 1; 574 575 end: 576 ERR_print_errors(bio_err); 577 578 /* Clean up. */ 579 BIO_free_all(in_bio); 580 BIO_free_all(data_bio); 581 BIO_free_all(out_bio); 582 TS_REQ_free(query); 583 584 return ret; 585 } 586 587 static BIO * 588 BIO_open_with_default(const char *file, const char *mode, FILE *default_fp) 589 { 590 return file == NULL ? BIO_new_fp(default_fp, BIO_NOCLOSE) : 591 BIO_new_file(file, mode); 592 } 593 594 static TS_REQ * 595 create_query(BIO *data_bio, char *digest, const EVP_MD *md, const char *policy, 596 int no_nonce, int cert) 597 { 598 int ret = 0; 599 TS_REQ *ts_req = NULL; 600 int len; 601 TS_MSG_IMPRINT *msg_imprint = NULL; 602 X509_ALGOR *algo = NULL; 603 unsigned char *data = NULL; 604 ASN1_OBJECT *policy_obj = NULL; 605 ASN1_INTEGER *nonce_asn1 = NULL; 606 607 /* Setting default message digest. */ 608 if (md == NULL && (md = EVP_get_digestbyname("sha1")) == NULL) 609 goto err; 610 611 /* Creating request object. */ 612 if ((ts_req = TS_REQ_new()) == NULL) 613 goto err; 614 615 /* Setting version. */ 616 if (!TS_REQ_set_version(ts_req, 1)) 617 goto err; 618 619 /* Creating and adding MSG_IMPRINT object. */ 620 if ((msg_imprint = TS_MSG_IMPRINT_new()) == NULL) 621 goto err; 622 623 /* Adding algorithm. */ 624 if ((algo = X509_ALGOR_new()) == NULL) 625 goto err; 626 if ((algo->algorithm = OBJ_nid2obj(EVP_MD_type(md))) == NULL) 627 goto err; 628 if ((algo->parameter = ASN1_TYPE_new()) == NULL) 629 goto err; 630 algo->parameter->type = V_ASN1_NULL; 631 if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo)) 632 goto err; 633 634 /* Adding message digest. */ 635 if ((len = create_digest(data_bio, digest, md, &data)) == 0) 636 goto err; 637 if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len)) 638 goto err; 639 640 if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint)) 641 goto err; 642 643 /* Setting policy if requested. */ 644 if (policy != NULL && (policy_obj = txt2obj(policy)) == NULL) 645 goto err; 646 if (policy_obj != NULL && !TS_REQ_set_policy_id(ts_req, policy_obj)) 647 goto err; 648 649 /* Setting nonce if requested. */ 650 if (!no_nonce && (nonce_asn1 = create_nonce(NONCE_LENGTH)) == NULL) 651 goto err; 652 if (nonce_asn1 != NULL && !TS_REQ_set_nonce(ts_req, nonce_asn1)) 653 goto err; 654 655 /* Setting certificate request flag if requested. */ 656 if (!TS_REQ_set_cert_req(ts_req, cert)) 657 goto err; 658 659 ret = 1; 660 661 err: 662 if (!ret) { 663 TS_REQ_free(ts_req); 664 ts_req = NULL; 665 BIO_printf(bio_err, "could not create query\n"); 666 } 667 TS_MSG_IMPRINT_free(msg_imprint); 668 X509_ALGOR_free(algo); 669 free(data); 670 ASN1_OBJECT_free(policy_obj); 671 ASN1_INTEGER_free(nonce_asn1); 672 673 return ts_req; 674 } 675 676 static int 677 create_digest(BIO *input, char *digest, const EVP_MD *md, 678 unsigned char **md_value) 679 { 680 int md_value_len; 681 EVP_MD_CTX *md_ctx = NULL; 682 683 md_value_len = EVP_MD_size(md); 684 if (md_value_len < 0) 685 goto err; 686 687 if (input != NULL) { 688 /* Digest must be computed from an input file. */ 689 unsigned char buffer[4096]; 690 int length; 691 692 *md_value = malloc(md_value_len); 693 if (*md_value == NULL) 694 goto err; 695 696 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 697 goto err; 698 699 if (!EVP_DigestInit(md_ctx, md)) 700 goto err; 701 702 while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) { 703 if (!EVP_DigestUpdate(md_ctx, buffer, length)) 704 goto err; 705 } 706 707 if (!EVP_DigestFinal(md_ctx, *md_value, NULL)) 708 goto err; 709 710 EVP_MD_CTX_free(md_ctx); 711 md_ctx = NULL; 712 713 } else { 714 /* Digest bytes are specified with digest. */ 715 long digest_len; 716 717 *md_value = string_to_hex(digest, &digest_len); 718 if (*md_value == NULL || md_value_len != digest_len) { 719 free(*md_value); 720 *md_value = NULL; 721 BIO_printf(bio_err, "bad digest, %d bytes " 722 "must be specified\n", md_value_len); 723 goto err; 724 } 725 } 726 727 return md_value_len; 728 729 err: 730 EVP_MD_CTX_free(md_ctx); 731 return 0; 732 } 733 734 static ASN1_INTEGER * 735 create_nonce(int bits) 736 { 737 unsigned char buf[20]; 738 ASN1_INTEGER *nonce = NULL; 739 int len = (bits - 1) / 8 + 1; 740 int i; 741 742 /* Generating random byte sequence. */ 743 if (len > (int) sizeof(buf)) 744 goto err; 745 arc4random_buf(buf, len); 746 747 /* Find the first non-zero byte and creating ASN1_INTEGER object. */ 748 for (i = 0; i < len && !buf[i]; ++i) 749 ; 750 if ((nonce = ASN1_INTEGER_new()) == NULL) 751 goto err; 752 free(nonce->data); 753 /* Allocate at least one byte. */ 754 nonce->length = len - i; 755 if ((nonce->data = malloc(nonce->length + 1)) == NULL) 756 goto err; 757 memcpy(nonce->data, buf + i, nonce->length); 758 759 return nonce; 760 761 err: 762 BIO_printf(bio_err, "could not create nonce\n"); 763 ASN1_INTEGER_free(nonce); 764 return NULL; 765 } 766 767 /* 768 * Reply-related method definitions. 769 */ 770 771 static int 772 reply_command(CONF *conf, char *section, char *queryfile, char *passin, 773 char *inkey, char *signer, char *chain, const char *policy, char *in, 774 int token_in, char *out, int token_out, int text) 775 { 776 int ret = 0; 777 TS_RESP *response = NULL; 778 BIO *in_bio = NULL; 779 BIO *query_bio = NULL; 780 BIO *inkey_bio = NULL; 781 BIO *signer_bio = NULL; 782 BIO *out_bio = NULL; 783 784 /* Build response object either from response or query. */ 785 if (in != NULL) { 786 if ((in_bio = BIO_new_file(in, "rb")) == NULL) 787 goto end; 788 if (token_in) { 789 /* 790 * We have a ContentInfo (PKCS7) object, add 791 * 'granted' status info around it. 792 */ 793 response = read_PKCS7(in_bio); 794 } else { 795 /* We have a ready-made TS_RESP object. */ 796 response = d2i_TS_RESP_bio(in_bio, NULL); 797 } 798 } else { 799 response = create_response(conf, section, queryfile, passin, 800 inkey, signer, chain, policy); 801 if (response != NULL) 802 BIO_printf(bio_err, "Response has been generated.\n"); 803 else 804 BIO_printf(bio_err, "Response is not generated.\n"); 805 } 806 if (response == NULL) 807 goto end; 808 809 /* Write response either in ASN.1 or text format. */ 810 if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL) 811 goto end; 812 if (text) { 813 /* Text output. */ 814 if (token_out) { 815 TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response); 816 if (!TS_TST_INFO_print_bio(out_bio, tst_info)) 817 goto end; 818 } else { 819 if (!TS_RESP_print_bio(out_bio, response)) 820 goto end; 821 } 822 } else { 823 /* ASN.1 DER output. */ 824 if (token_out) { 825 PKCS7 *token = TS_RESP_get_token(response); 826 if (!i2d_PKCS7_bio(out_bio, token)) 827 goto end; 828 } else { 829 if (!i2d_TS_RESP_bio(out_bio, response)) 830 goto end; 831 } 832 } 833 834 ret = 1; 835 836 end: 837 ERR_print_errors(bio_err); 838 839 /* Clean up. */ 840 BIO_free_all(in_bio); 841 BIO_free_all(query_bio); 842 BIO_free_all(inkey_bio); 843 BIO_free_all(signer_bio); 844 BIO_free_all(out_bio); 845 TS_RESP_free(response); 846 847 return ret; 848 } 849 850 /* Reads a PKCS7 token and adds default 'granted' status info to it. */ 851 static TS_RESP * 852 read_PKCS7(BIO *in_bio) 853 { 854 int ret = 0; 855 PKCS7 *token = NULL; 856 TS_TST_INFO *tst_info = NULL; 857 TS_RESP *resp = NULL; 858 TS_STATUS_INFO *si = NULL; 859 860 /* Read PKCS7 object and extract the signed time stamp info. */ 861 if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL) 862 goto end; 863 if ((tst_info = PKCS7_to_TS_TST_INFO(token)) == NULL) 864 goto end; 865 866 /* Creating response object. */ 867 if ((resp = TS_RESP_new()) == NULL) 868 goto end; 869 870 /* Create granted status info. */ 871 if ((si = TS_STATUS_INFO_new()) == NULL) 872 goto end; 873 if (!TS_STATUS_INFO_set_status(si, TS_STATUS_GRANTED)) 874 goto end; 875 if (!TS_RESP_set_status_info(resp, si)) 876 goto end; 877 878 /* Setting encapsulated token. */ 879 TS_RESP_set_tst_info(resp, token, tst_info); 880 token = NULL; /* Ownership is lost. */ 881 tst_info = NULL; /* Ownership is lost. */ 882 883 ret = 1; 884 end: 885 PKCS7_free(token); 886 TS_TST_INFO_free(tst_info); 887 if (!ret) { 888 TS_RESP_free(resp); 889 resp = NULL; 890 } 891 TS_STATUS_INFO_free(si); 892 return resp; 893 } 894 895 static TS_RESP * 896 create_response(CONF *conf, const char *section, char *queryfile, char *passin, 897 char *inkey, char *signer, char *chain, const char *policy) 898 { 899 int ret = 0; 900 TS_RESP *response = NULL; 901 BIO *query_bio = NULL; 902 TS_RESP_CTX *resp_ctx = NULL; 903 904 if ((query_bio = BIO_new_file(queryfile, "rb")) == NULL) 905 goto end; 906 907 /* Getting TSA configuration section. */ 908 if ((section = TS_CONF_get_tsa_section(conf, section)) == NULL) 909 goto end; 910 911 /* Setting up response generation context. */ 912 if ((resp_ctx = TS_RESP_CTX_new()) == NULL) 913 goto end; 914 915 /* Setting serial number provider callback. */ 916 if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx)) 917 goto end; 918 919 /* Setting TSA signer certificate. */ 920 if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx)) 921 goto end; 922 923 /* Setting TSA signer certificate chain. */ 924 if (!TS_CONF_set_certs(conf, section, chain, resp_ctx)) 925 goto end; 926 927 /* Setting TSA signer private key. */ 928 if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx)) 929 goto end; 930 931 /* Setting default policy OID. */ 932 if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx)) 933 goto end; 934 935 /* Setting acceptable policy OIDs. */ 936 if (!TS_CONF_set_policies(conf, section, resp_ctx)) 937 goto end; 938 939 /* Setting the acceptable one-way hash algorithms. */ 940 if (!TS_CONF_set_digests(conf, section, resp_ctx)) 941 goto end; 942 943 /* Setting guaranteed time stamp accuracy. */ 944 if (!TS_CONF_set_accuracy(conf, section, resp_ctx)) 945 goto end; 946 947 /* Setting the precision of the time. */ 948 if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx)) 949 goto end; 950 951 /* Setting the ordering flaf if requested. */ 952 if (!TS_CONF_set_ordering(conf, section, resp_ctx)) 953 goto end; 954 955 /* Setting the TSA name required flag if requested. */ 956 if (!TS_CONF_set_tsa_name(conf, section, resp_ctx)) 957 goto end; 958 959 /* Setting the ESS cert id chain flag if requested. */ 960 if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx)) 961 goto end; 962 963 /* Creating the response. */ 964 if ((response = TS_RESP_create_response(resp_ctx, query_bio)) == NULL) 965 goto end; 966 967 ret = 1; 968 end: 969 if (!ret) { 970 TS_RESP_free(response); 971 response = NULL; 972 } 973 TS_RESP_CTX_free(resp_ctx); 974 BIO_free_all(query_bio); 975 976 return response; 977 } 978 979 static ASN1_INTEGER * 980 serial_cb(TS_RESP_CTX *ctx, void *data) 981 { 982 const char *serial_file = (const char *) data; 983 ASN1_INTEGER *serial = next_serial(serial_file); 984 985 if (serial == NULL) { 986 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION, 987 "Error during serial number " 988 "generation."); 989 TS_RESP_CTX_add_failure_info(ctx, 990 TS_INFO_ADD_INFO_NOT_AVAILABLE); 991 } else 992 save_ts_serial(serial_file, serial); 993 994 return serial; 995 } 996 997 static ASN1_INTEGER * 998 next_serial(const char *serialfile) 999 { 1000 int ret = 0; 1001 BIO *in = NULL; 1002 ASN1_INTEGER *serial = NULL; 1003 BIGNUM *bn = NULL; 1004 1005 if ((serial = ASN1_INTEGER_new()) == NULL) 1006 goto err; 1007 1008 if ((in = BIO_new_file(serialfile, "r")) == NULL) { 1009 ERR_clear_error(); 1010 BIO_printf(bio_err, "Warning: could not open file %s for " 1011 "reading, using serial number: 1\n", serialfile); 1012 if (!ASN1_INTEGER_set(serial, 1)) 1013 goto err; 1014 } else { 1015 char buf[1024]; 1016 if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf))) { 1017 BIO_printf(bio_err, "unable to load number from %s\n", 1018 serialfile); 1019 goto err; 1020 } 1021 if ((bn = ASN1_INTEGER_to_BN(serial, NULL)) == NULL) 1022 goto err; 1023 ASN1_INTEGER_free(serial); 1024 serial = NULL; 1025 if (!BN_add_word(bn, 1)) 1026 goto err; 1027 if ((serial = BN_to_ASN1_INTEGER(bn, NULL)) == NULL) 1028 goto err; 1029 } 1030 ret = 1; 1031 err: 1032 if (!ret) { 1033 ASN1_INTEGER_free(serial); 1034 serial = NULL; 1035 } 1036 BIO_free_all(in); 1037 BN_free(bn); 1038 return serial; 1039 } 1040 1041 static int 1042 save_ts_serial(const char *serialfile, ASN1_INTEGER *serial) 1043 { 1044 int ret = 0; 1045 BIO *out = NULL; 1046 1047 if ((out = BIO_new_file(serialfile, "w")) == NULL) 1048 goto err; 1049 if (i2a_ASN1_INTEGER(out, serial) <= 0) 1050 goto err; 1051 if (BIO_puts(out, "\n") <= 0) 1052 goto err; 1053 ret = 1; 1054 err: 1055 if (!ret) 1056 BIO_printf(bio_err, "could not save serial number to %s\n", 1057 serialfile); 1058 BIO_free_all(out); 1059 return ret; 1060 } 1061 1062 /* 1063 * Verify-related method definitions. 1064 */ 1065 1066 static int 1067 verify_command(char *data, char *digest, char *queryfile, char *in, 1068 int token_in, char *ca_path, char *ca_file, char *untrusted) 1069 { 1070 BIO *in_bio = NULL; 1071 PKCS7 *token = NULL; 1072 TS_RESP *response = NULL; 1073 TS_VERIFY_CTX *verify_ctx = NULL; 1074 int ret = 0; 1075 1076 /* Decode the token (PKCS7) or response (TS_RESP) files. */ 1077 if ((in_bio = BIO_new_file(in, "rb")) == NULL) 1078 goto end; 1079 if (token_in) { 1080 if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL) 1081 goto end; 1082 } else { 1083 if ((response = d2i_TS_RESP_bio(in_bio, NULL)) == NULL) 1084 goto end; 1085 } 1086 1087 if ((verify_ctx = create_verify_ctx(data, digest, queryfile, 1088 ca_path, ca_file, untrusted)) == NULL) 1089 goto end; 1090 1091 /* Checking the token or response against the request. */ 1092 ret = token_in ? 1093 TS_RESP_verify_token(verify_ctx, token) : 1094 TS_RESP_verify_response(verify_ctx, response); 1095 1096 end: 1097 printf("Verification: "); 1098 if (ret) 1099 printf("OK\n"); 1100 else { 1101 printf("FAILED\n"); 1102 /* Print errors, if there are any. */ 1103 ERR_print_errors(bio_err); 1104 } 1105 1106 /* Clean up. */ 1107 BIO_free_all(in_bio); 1108 PKCS7_free(token); 1109 TS_RESP_free(response); 1110 TS_VERIFY_CTX_free(verify_ctx); 1111 return ret; 1112 } 1113 1114 static TS_VERIFY_CTX * 1115 create_verify_ctx(char *data, char *digest, char *queryfile, char *ca_path, 1116 char *ca_file, char *untrusted) 1117 { 1118 TS_VERIFY_CTX *ctx = NULL; 1119 BIO *input = NULL; 1120 TS_REQ *request = NULL; 1121 X509_STORE *store; 1122 STACK_OF(X509) *certs; 1123 int ret = 0; 1124 1125 if (data != NULL || digest != NULL) { 1126 if ((ctx = TS_VERIFY_CTX_new()) == NULL) 1127 goto err; 1128 TS_VERIFY_CTX_set_flags(ctx, TS_VFY_VERSION | TS_VFY_SIGNER); 1129 if (data != NULL) { 1130 BIO *data_bio; 1131 1132 TS_VERIFY_CTX_add_flags(ctx, TS_VFY_DATA); 1133 if ((data_bio = BIO_new_file(data, "rb")) == NULL) 1134 goto err; 1135 TS_VERIFY_CTX_set_data(ctx, data_bio); 1136 } else if (digest != NULL) { 1137 unsigned char *imprint; 1138 long imprint_len; 1139 1140 TS_VERIFY_CTX_add_flags(ctx, TS_VFY_IMPRINT); 1141 if ((imprint = string_to_hex(digest, 1142 &imprint_len)) == NULL) { 1143 BIO_printf(bio_err, "invalid digest string\n"); 1144 goto err; 1145 } 1146 TS_VERIFY_CTX_set_imprint(ctx, imprint, imprint_len); 1147 } 1148 } else if (queryfile != NULL) { 1149 /* 1150 * The request has just to be read, decoded and converted to 1151 * a verify context object. 1152 */ 1153 if ((input = BIO_new_file(queryfile, "rb")) == NULL) 1154 goto err; 1155 if ((request = d2i_TS_REQ_bio(input, NULL)) == NULL) 1156 goto err; 1157 if ((ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL)) == NULL) 1158 goto err; 1159 } else 1160 return NULL; 1161 1162 /* Add the signature verification flag and arguments. */ 1163 TS_VERIFY_CTX_add_flags(ctx, TS_VFY_SIGNATURE); 1164 1165 /* Initialising the X509_STORE object. */ 1166 if ((store = create_cert_store(ca_path, ca_file)) == NULL) 1167 goto err; 1168 TS_VERIFY_CTX_set_store(ctx, store); 1169 1170 /* Loading untrusted certificates. */ 1171 if (untrusted != NULL) { 1172 if ((certs = TS_CONF_load_certs(untrusted)) == NULL) 1173 goto err; 1174 TS_VERIFY_CTX_set_certs(ctx, certs); 1175 } 1176 1177 ret = 1; 1178 err: 1179 if (!ret) { 1180 TS_VERIFY_CTX_free(ctx); 1181 ctx = NULL; 1182 } 1183 BIO_free_all(input); 1184 TS_REQ_free(request); 1185 return ctx; 1186 } 1187 1188 static X509_STORE * 1189 create_cert_store(char *ca_path, char *ca_file) 1190 { 1191 X509_STORE *cert_ctx = NULL; 1192 X509_LOOKUP *lookup = NULL; 1193 int i; 1194 1195 /* Creating the X509_STORE object. */ 1196 if ((cert_ctx = X509_STORE_new()) == NULL) 1197 goto err; 1198 1199 /* Setting the callback for certificate chain verification. */ 1200 X509_STORE_set_verify_cb(cert_ctx, verify_cb); 1201 1202 /* Adding a trusted certificate directory source. */ 1203 if (ca_path != NULL) { 1204 lookup = X509_STORE_add_lookup(cert_ctx, 1205 X509_LOOKUP_hash_dir()); 1206 if (lookup == NULL) { 1207 BIO_printf(bio_err, "memory allocation failure\n"); 1208 goto err; 1209 } 1210 i = X509_LOOKUP_add_dir(lookup, ca_path, X509_FILETYPE_PEM); 1211 if (!i) { 1212 BIO_printf(bio_err, "Error loading directory %s\n", 1213 ca_path); 1214 goto err; 1215 } 1216 } 1217 /* Adding a trusted certificate file source. */ 1218 if (ca_file != NULL) { 1219 lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file()); 1220 if (lookup == NULL) { 1221 BIO_printf(bio_err, "memory allocation failure\n"); 1222 goto err; 1223 } 1224 i = X509_LOOKUP_load_file(lookup, ca_file, X509_FILETYPE_PEM); 1225 if (!i) { 1226 BIO_printf(bio_err, "Error loading file %s\n", ca_file); 1227 goto err; 1228 } 1229 } 1230 return cert_ctx; 1231 err: 1232 X509_STORE_free(cert_ctx); 1233 return NULL; 1234 } 1235 1236 static int 1237 verify_cb(int ok, X509_STORE_CTX *ctx) 1238 { 1239 /* 1240 char buf[256]; 1241 1242 if (!ok) 1243 { 1244 X509_NAME_oneline(X509_get_subject_name(ctx->current_cert), 1245 buf, sizeof(buf)); 1246 printf("%s\n", buf); 1247 printf("error %d at %d depth lookup: %s\n", 1248 ctx->error, ctx->error_depth, 1249 X509_verify_cert_error_string(ctx->error)); 1250 } 1251 */ 1252 1253 return ok; 1254 } 1255