apps/ts.c

   1 /*
   2  * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
   3  * 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 #include "apps.h"
  63 #include <openssl/bio.h>
  64 #include <openssl/err.h>
  65 #include <openssl/pem.h>
  66 #include <openssl/rand.h>
  67 #include <openssl/ts.h>
  68 #include <openssl/bn.h>
  69
  70 /* Length of the nonce of the request in bits (must be a multiple of 8). */
  71 #define NONCE_LENGTH            64
  72
  73 /* Macro definitions for the configuration file. */
  74 #define ENV_OID_FILE            "oid_file"
  75
  76 /* Local function declarations. */
  77
  78 static ASN1_OBJECT *txt2obj(const char *oid);
  79 static CONF *load_config_file(const char *configfile);
  80
  81 /* Query related functions. */
  82 static int query_command(const char *data, char *digest,
  83                          const EVP_MD *md, const char *policy, int no_nonce,
  84                          int cert, const char *in, const char *out, int text);
  85 static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
  86                             const char *policy, int no_nonce, int cert);
  87 static int create_digest(BIO *input, char *digest,
  88                          const EVP_MD *md, unsigned char **md_value);
  89 static ASN1_INTEGER *create_nonce(int bits);
  90
  91 /* Reply related functions. */
  92 static int reply_command(CONF *conf, char *section, char *engine,
  93                          char *queryfile, char *passin, char *inkey,
  94                          char *signer, char *chain, const char *policy,
  95                          char *in, int token_in, char *out, int token_out,
  96                          int text);
  97 static TS_RESP *read_PKCS7(BIO *in_bio);
  98 static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
  99                                 char *queryfile, char *passin,
 100                                 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,
 108                           char *in, int token_in,
 109                           char *CApath, char *CAfile, char *untrusted);
 110 static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
 111                                         char *queryfile,
 112                                         char *CApath, char *CAfile,
 113                                         char *untrusted);
 114 static X509_STORE *create_cert_store(char *CApath, char *CAfile);
 115 static int verify_cb(int ok, X509_STORE_CTX *ctx);
 116
 117 typedef enum OPTION_choice {
 118     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 119     OPT_ENGINE, OPT_CONFIG, OPT_SECTION, OPT_QUERY, OPT_DATA,
 120     OPT_DIGEST, OPT_RAND, OPT_POLICY, OPT_NO_NONCE, OPT_CERT,
 121     OPT_IN, OPT_TOKEN_IN, OPT_OUT, OPT_TOKEN_OUT, OPT_TEXT,
 122     OPT_REPLY, OPT_QUERYFILE, OPT_PASSIN, OPT_INKEY, OPT_SIGNER,
 123     OPT_CHAIN, OPT_VERIFY, OPT_CAPATH, OPT_CAFILE, OPT_UNTRUSTED,
 124     OPT_MD
 125 } OPTION_CHOICE;
 126
 127 OPTIONS ts_options[] = {
 128     {"help", OPT_HELP, '-', "Display this summary"},
 129     {"config", OPT_CONFIG, '<', "Configuration file"},
 130     {"section", OPT_SECTION, 's', "Section to use within config file"},
 131     {"query", OPT_QUERY, '-', "Generate a TS query"},
 132     {"data", OPT_DATA, '<', "File to hash"},
 133     {"digest", OPT_DIGEST, 's', "Digest (as a hex string)"},
 134     {"rand", OPT_RAND, 's',
 135      "Load the file(s) into the random number generator"},
 136     {"policy", OPT_POLICY, 's', "Policy OID to use"},
 137     {"no_nonce", OPT_NO_NONCE, '-', "Do not include a nonce"},
 138     {"cert", OPT_CERT, '-', "Put cert request into query"},
 139     {"in", OPT_IN, '<', "Input file"},
 140     {"token_in", OPT_TOKEN_IN, '-', "Input is a PKCS#7 file"},
 141     {"out", OPT_OUT, '>', "Output file"},
 142     {"token_out", OPT_TOKEN_OUT, '-', "Output is a PKCS#7 file"},
 143     {"text", OPT_TEXT, '-', "Output text (not DER)"},
 144     {"reply", OPT_REPLY, '-', "Generate a TS reply"},
 145     {"queryfile", OPT_QUERYFILE, '<', "File containing a TS query"},
 146     {"passin", OPT_PASSIN, 's'},
 147     {"inkey", OPT_INKEY, '<', "File with private key for reply"},
 148     {"signer", OPT_SIGNER, 's'},
 149     {"chain", OPT_CHAIN, '<', "File with signer CA chain"},
 150     {"verify", OPT_VERIFY, '-', "Verify a TS response"},
 151     {"CApath", OPT_CAPATH, '/', "Path to trusted CA files"},
 152     {"CAfile", OPT_CAFILE, '<', "File with trusted CA certs"},
 153     {"untrusted", OPT_UNTRUSTED, '<', "File with untrusted certs"},
 154 #ifndef OPENSSL_NO_ENGINE
 155     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 156 #endif
 157     {"", OPT_MD, '-', "Any supported digest"},
 158     {NULL}
 159 };
 160
 161 /*
 162  * This comand is so complex, special help is needed.
 163  */
 164 static char* opt_helplist[] = {
 165     "Typical uses:",
 166     "ts -query [-rand file...] [-config file] [-data file]",
 167     "          [-digest hexstring] [-policy oid] [-no_nonce] [-cert]",
 168     "          [-in file] [-out file] [-text]",
 169     "  or",
 170     "ts -reply [-config file] [-section tsa_section]",
 171     "          [-queryfile file] [-passin password]",
 172     "          [-signer tsa_cert.pem] [-inkey private_key.pem]",
 173     "          [-chain certs_file.pem] [-policy oid]",
 174     "          [-in file] [-token_in] [-out file] [-token_out]",
 175 #ifndef OPENSSL_NO_ENGINE
 176     "          [-text]",
 177 #else
 178     "          [-text] [-engine id]",
 179 #endif
 180     "  or",
 181     "ts -verify -CApath dir -CAfile file.pem -untrusted file.pem",
 182     "           [-data file] [-digest hexstring]",
 183     "           [-queryfile file] -in file [-token_in]",
 184     NULL,
 185 };
 186
 187 int ts_main(int argc, char **argv)
 188 {
 189     CONF *conf = NULL;
 190     char *CAfile = NULL, *untrusted = NULL, *engine = NULL, *prog, **helpp;
 191     char *configfile = NULL, *section = NULL, *password = NULL;
 192     char *data = NULL, *digest = NULL, *rnd = NULL, *policy = NULL;
 193     char *in = NULL, *out = NULL, *queryfile = NULL, *passin = NULL;
 194     char *inkey = NULL, *signer = NULL, *chain = NULL, *CApath = NULL;
 195     const EVP_MD *md = NULL;
 196     OPTION_CHOICE o, mode = OPT_ERR;
 197     int ret = 1, no_nonce = 0, cert = 0, text = 0;
 198     /* Input is ContentInfo instead of TimeStampResp. */
 199     int token_in = 0;
 200     /* Output is ContentInfo instead of TimeStampResp. */
 201     int token_out = 0;
 202
 203     prog = opt_init(argc, argv, ts_options);
 204     while ((o = opt_next()) != OPT_EOF) {
 205         switch (o) {
 206         case OPT_EOF:
 207         case OPT_ERR:
 208  opthelp:
 209             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 210             goto end;
 211         case OPT_HELP:
 212             opt_help(ts_options);
 213             for (helpp = opt_helplist; *helpp; ++helpp)
 214                 BIO_printf(bio_err, "%s\n", *helpp);
 215             ret = 0;
 216             goto end;
 217         case OPT_CONFIG:
 218             configfile = opt_arg();
 219             break;
 220         case OPT_SECTION:
 221             section = opt_arg();
 222             break;
 223         case OPT_QUERY:
 224         case OPT_REPLY:
 225         case OPT_VERIFY:
 226             if (mode != OPT_ERR)
 227                 goto opthelp;
 228             mode = o;
 229             break;
 230         case OPT_DATA:
 231             data = opt_arg();
 232             break;
 233         case OPT_DIGEST:
 234             digest = opt_arg();
 235             break;
 236         case OPT_RAND:
 237             rnd = opt_arg();
 238             break;
 239         case OPT_POLICY:
 240             policy = opt_arg();
 241             break;
 242         case OPT_NO_NONCE:
 243             no_nonce = 1;
 244             break;
 245         case OPT_CERT:
 246             cert = 1;
 247             break;
 248         case OPT_IN:
 249             in = opt_arg();
 250             break;
 251         case OPT_TOKEN_IN:
 252             token_in = 1;
 253             break;
 254         case OPT_OUT:
 255             out = opt_arg();
 256             break;
 257         case OPT_TOKEN_OUT:
 258             token_out = 1;
 259             break;
 260         case OPT_TEXT:
 261             text = 1;
 262             break;
 263         case OPT_QUERYFILE:
 264             queryfile = opt_arg();
 265             break;
 266         case OPT_PASSIN:
 267             passin = opt_arg();
 268             break;
 269         case OPT_INKEY:
 270             inkey = opt_arg();
 271             break;
 272         case OPT_SIGNER:
 273             signer = opt_arg();
 274             break;
 275         case OPT_CHAIN:
 276             chain = opt_arg();
 277             break;
 278         case OPT_CAPATH:
 279             CApath = opt_arg();
 280             break;
 281         case OPT_CAFILE:
 282             CAfile = opt_arg();
 283             break;
 284         case OPT_UNTRUSTED:
 285             untrusted = opt_arg();
 286             break;
 287         case OPT_ENGINE:
 288             engine = opt_arg();
 289             break;
 290         case OPT_MD:
 291             if (!opt_md(opt_unknown(), &md))
 292                 goto opthelp;
 293             break;
 294         }
 295     }
 296     argc = opt_num_rest();
 297     argv = opt_rest();
 298     if (mode == OPT_ERR || argc != 0)
 299         goto opthelp;
 300
 301     /* Seed the random number generator if it is going to be used. */
 302     if (mode == OPT_QUERY && !no_nonce) {
 303         if (!app_RAND_load_file(NULL, 1) && rnd == NULL)
 304             BIO_printf(bio_err, "warning, not much extra random "
 305                        "data, consider using the -rand option\n");
 306         if (rnd != NULL)
 307             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 308                        app_RAND_load_files(rnd));
 309     }
 310
 311     /* Get the password if required. */
 312     if (mode == OPT_REPLY && passin &&
 313         !app_passwd(passin, NULL, &password, NULL)) {
 314         BIO_printf(bio_err, "Error getting password.\n");
 315         goto end;
 316     }
 317
 318     /*
 319      * Check consistency of parameters and execute the appropriate function.
 320      */
 321     switch (mode) {
 322     default:
 323     case OPT_ERR:
 324         goto opthelp;
 325     case OPT_QUERY:
 326         /*
 327          * Data file and message imprint cannot be specified at the same
 328          * time.
 329          */
 330         ret = data != NULL && digest != NULL;
 331         if (ret)
 332             goto opthelp;
 333         /* Load the config file for possible policy OIDs. */
 334         conf = load_config_file(configfile);
 335         ret = !query_command(data, digest, md, policy, no_nonce, cert,
 336                              in, out, text);
 337         break;
 338     case OPT_REPLY:
 339         conf = load_config_file(configfile);
 340         if (in == NULL) {
 341             ret = !(queryfile != NULL && conf != NULL && !token_in);
 342             if (ret)
 343                 goto opthelp;
 344         } else {
 345             /* 'in' and 'queryfile' are exclusive. */
 346             ret = !(queryfile == NULL);
 347             if (ret)
 348                 goto opthelp;
 349         }
 350         ret = !reply_command(conf, section, engine, queryfile,
 351                              password, inkey, signer, chain, policy,
 352                              in, token_in, out, token_out, text);
 353         break;
 354     case OPT_VERIFY:
 355         ret = !(((queryfile && !data && !digest)
 356                  || (!queryfile && data && !digest)
 357                  || (!queryfile && !data && digest))
 358                 && in != NULL);
 359         if (ret)
 360             goto opthelp;
 361
 362         ret = !verify_command(data, digest, queryfile, in, token_in,
 363                               CApath, CAfile, untrusted);
 364     }
 365
 366  end:
 367     /* Clean up. */
 368     app_RAND_write_file(NULL);
 369     NCONF_free(conf);
 370     OPENSSL_free(password);
 371     OBJ_cleanup();
 372
 373     return (ret);
 374 }
 375
 376 /*
 377  * Configuration file-related function definitions.
 378  */
 379
 380 static ASN1_OBJECT *txt2obj(const char *oid)
 381 {
 382     ASN1_OBJECT *oid_obj = NULL;
 383
 384     if (!(oid_obj = OBJ_txt2obj(oid, 0)))
 385         BIO_printf(bio_err, "cannot convert %s to OID\n", oid);
 386
 387     return oid_obj;
 388 }
 389
 390 static CONF *load_config_file(const char *configfile)
 391 {
 392     CONF *conf = NULL;
 393     long errorline = -1;
 394
 395     if (!configfile)
 396         configfile = getenv("OPENSSL_CONF");
 397     if (!configfile)
 398         configfile = getenv("SSLEAY_CONF");
 399
 400     if (configfile &&
 401         (!(conf = NCONF_new(NULL)) ||
 402          NCONF_load(conf, configfile, &errorline) <= 0)) {
 403         if (errorline <= 0)
 404             BIO_printf(bio_err, "error loading the config file "
 405                        "'%s'\n", configfile);
 406         else
 407             BIO_printf(bio_err, "error on line %ld of config file "
 408                        "'%s'\n", errorline, configfile);
 409     }
 410
 411     if (conf != NULL) {
 412         const char *p;
 413
 414         BIO_printf(bio_err, "Using configuration from %s\n", configfile);
 415         p = NCONF_get_string(conf, NULL, ENV_OID_FILE);
 416         if (p != NULL) {
 417             BIO *oid_bio = BIO_new_file(p, "r");
 418             if (!oid_bio)
 419                 ERR_print_errors(bio_err);
 420             else {
 421                 OBJ_create_objects(oid_bio);
 422                 BIO_free_all(oid_bio);
 423             }
 424         } else
 425             ERR_clear_error();
 426         if (!add_oid_section(conf))
 427             ERR_print_errors(bio_err);
 428     }
 429     return conf;
 430 }
 431
 432 /*
 433  * Query-related method definitions.
 434  */
 435 static int query_command(const char *data, char *digest, const EVP_MD *md,
 436                          const char *policy, int no_nonce,
 437                          int cert, const char *in, const char *out, int text)
 438 {
 439     int ret = 0;
 440     TS_REQ *query = NULL;
 441     BIO *in_bio = NULL;
 442     BIO *data_bio = NULL;
 443     BIO *out_bio = NULL;
 444
 445     /* Build query object either from file or from scratch. */
 446     if (in != NULL) {
 447         if ((in_bio = BIO_new_file(in, "rb")) == NULL)
 448             goto end;
 449         query = d2i_TS_REQ_bio(in_bio, NULL);
 450     } else {
 451         /* Open the file if no explicit digest bytes were specified. */
 452         if (!digest && !(data_bio = bio_open_default(data, "rb")))
 453             goto end;
 454         query = create_query(data_bio, digest, md, policy, no_nonce, cert);
 455     }
 456     if (query == NULL)
 457         goto end;
 458
 459     /* Write query either in ASN.1 or in text format. */
 460     if ((out_bio = bio_open_default(out, "wb")) == NULL)
 461         goto end;
 462     if (text) {
 463         /* Text output. */
 464         if (!TS_REQ_print_bio(out_bio, query))
 465             goto end;
 466     } else {
 467         /* ASN.1 output. */
 468         if (!i2d_TS_REQ_bio(out_bio, query))
 469             goto end;
 470     }
 471
 472     ret = 1;
 473
 474  end:
 475     ERR_print_errors(bio_err);
 476
 477     /* Clean up. */
 478     BIO_free_all(in_bio);
 479     BIO_free_all(data_bio);
 480     BIO_free_all(out_bio);
 481     TS_REQ_free(query);
 482
 483     return ret;
 484 }
 485
 486 static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
 487                             const char *policy, int no_nonce, int cert)
 488 {
 489     int ret = 0;
 490     TS_REQ *ts_req = NULL;
 491     int len;
 492     TS_MSG_IMPRINT *msg_imprint = NULL;
 493     X509_ALGOR *algo = NULL;
 494     unsigned char *data = NULL;
 495     ASN1_OBJECT *policy_obj = NULL;
 496     ASN1_INTEGER *nonce_asn1 = NULL;
 497
 498     /* Setting default message digest. */
 499     if (!md && !(md = EVP_get_digestbyname("sha1")))
 500         goto err;
 501
 502     /* Creating request object. */
 503     if (!(ts_req = TS_REQ_new()))
 504         goto err;
 505
 506     /* Setting version. */
 507     if (!TS_REQ_set_version(ts_req, 1))
 508         goto err;
 509
 510     /* Creating and adding MSG_IMPRINT object. */
 511     if (!(msg_imprint = TS_MSG_IMPRINT_new()))
 512         goto err;
 513
 514     /* Adding algorithm. */
 515     if (!(algo = X509_ALGOR_new()))
 516         goto err;
 517     if (!(algo->algorithm = OBJ_nid2obj(EVP_MD_type(md))))
 518         goto err;
 519     if (!(algo->parameter = ASN1_TYPE_new()))
 520         goto err;
 521     algo->parameter->type = V_ASN1_NULL;
 522     if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo))
 523         goto err;
 524
 525     /* Adding message digest. */
 526     if ((len = create_digest(data_bio, digest, md, &data)) == 0)
 527         goto err;
 528     if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len))
 529         goto err;
 530
 531     if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint))
 532         goto err;
 533
 534     /* Setting policy if requested. */
 535     if (policy && !(policy_obj = txt2obj(policy)))
 536         goto err;
 537     if (policy_obj && !TS_REQ_set_policy_id(ts_req, policy_obj))
 538         goto err;
 539
 540     /* Setting nonce if requested. */
 541     if (!no_nonce && !(nonce_asn1 = create_nonce(NONCE_LENGTH)))
 542         goto err;
 543     if (nonce_asn1 && !TS_REQ_set_nonce(ts_req, nonce_asn1))
 544         goto err;
 545
 546     /* Setting certificate request flag if requested. */
 547     if (!TS_REQ_set_cert_req(ts_req, cert))
 548         goto err;
 549
 550     ret = 1;
 551  err:
 552     if (!ret) {
 553         TS_REQ_free(ts_req);
 554         ts_req = NULL;
 555         BIO_printf(bio_err, "could not create query\n");
 556     }
 557     TS_MSG_IMPRINT_free(msg_imprint);
 558     X509_ALGOR_free(algo);
 559     OPENSSL_free(data);
 560     ASN1_OBJECT_free(policy_obj);
 561     ASN1_INTEGER_free(nonce_asn1);
 562     return ts_req;
 563 }
 564
 565 static int create_digest(BIO *input, char *digest, const EVP_MD *md,
 566                          unsigned char **md_value)
 567 {
 568     int md_value_len;
 569
 570     md_value_len = EVP_MD_size(md);
 571     if (md_value_len < 0)
 572         goto err;
 573     if (input) {
 574         /* Digest must be computed from an input file. */
 575         EVP_MD_CTX md_ctx;
 576         unsigned char buffer[4096];
 577         int length;
 578
 579         *md_value = app_malloc(md_value_len, "digest buffer");
 580         EVP_DigestInit(&md_ctx, md);
 581         while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) {
 582             EVP_DigestUpdate(&md_ctx, buffer, length);
 583         }
 584         if (!EVP_DigestFinal(&md_ctx, *md_value, NULL))
 585             return 0;
 586     } else {
 587         /* Digest bytes are specified with digest. */
 588         long digest_len;
 589         *md_value = string_to_hex(digest, &digest_len);
 590         if (!*md_value || md_value_len != digest_len) {
 591             OPENSSL_free(*md_value);
 592             *md_value = NULL;
 593             BIO_printf(bio_err, "bad digest, %d bytes "
 594                        "must be specified\n", md_value_len);
 595             goto err;
 596         }
 597     }
 598
 599     return md_value_len;
 600  err:
 601     return 0;
 602 }
 603
 604 static ASN1_INTEGER *create_nonce(int bits)
 605 {
 606     unsigned char buf[20];
 607     ASN1_INTEGER *nonce = NULL;
 608     int len = (bits - 1) / 8 + 1;
 609     int i;
 610
 611     /* Generating random byte sequence. */
 612     if (len > (int)sizeof(buf))
 613         goto err;
 614     if (RAND_bytes(buf, len) <= 0)
 615         goto err;
 616
 617     /* Find the first non-zero byte and creating ASN1_INTEGER object. */
 618     for (i = 0; i < len && !buf[i]; ++i) ;
 619     if (!(nonce = ASN1_INTEGER_new()))
 620         goto err;
 621     OPENSSL_free(nonce->data);
 622     /* Allocate at least one byte. */
 623     nonce->length = len - i;
 624     nonce->data = app_malloc(nonce->length + 1, "nonce buffer");
 625     memcpy(nonce->data, buf + i, nonce->length);
 626
 627     return nonce;
 628  err:
 629     BIO_printf(bio_err, "could not create nonce\n");
 630     ASN1_INTEGER_free(nonce);
 631     return NULL;
 632 }
 633
 634 /*
 635  * Reply-related method definitions.
 636  */
 637
 638 static int reply_command(CONF *conf, char *section, char *engine,
 639                          char *queryfile, char *passin, char *inkey,
 640                          char *signer, char *chain, const char *policy,
 641                          char *in, int token_in,
 642                          char *out, int token_out, int text)
 643 {
 644     int ret = 0;
 645     TS_RESP *response = NULL;
 646     BIO *in_bio = NULL;
 647     BIO *query_bio = NULL;
 648     BIO *inkey_bio = NULL;
 649     BIO *signer_bio = NULL;
 650     BIO *out_bio = NULL;
 651
 652     /* Build response object either from response or query. */
 653     if (in != NULL) {
 654         if ((in_bio = BIO_new_file(in, "rb")) == NULL)
 655             goto end;
 656         if (token_in) {
 657             /*
 658              * We have a ContentInfo (PKCS7) object, add 'granted' status
 659              * info around it.
 660              */
 661             response = read_PKCS7(in_bio);
 662         } else {
 663             /* We have a ready-made TS_RESP object. */
 664             response = d2i_TS_RESP_bio(in_bio, NULL);
 665         }
 666     } else {
 667         response = create_response(conf, section, engine, queryfile,
 668                                    passin, inkey, signer, chain, policy);
 669         if (response)
 670             BIO_printf(bio_err, "Response has been generated.\n");
 671         else
 672             BIO_printf(bio_err, "Response is not generated.\n");
 673     }
 674     if (response == NULL)
 675         goto end;
 676
 677     /* Write response either in ASN.1 or text format. */
 678     if ((out_bio = bio_open_default(out, "wb")) == NULL)
 679         goto end;
 680     if (text) {
 681         /* Text output. */
 682         if (token_out) {
 683             TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
 684             if (!TS_TST_INFO_print_bio(out_bio, tst_info))
 685                 goto end;
 686         } else {
 687             if (!TS_RESP_print_bio(out_bio, response))
 688                 goto end;
 689         }
 690     } else {
 691         /* ASN.1 DER output. */
 692         if (token_out) {
 693             PKCS7 *token = TS_RESP_get_token(response);
 694             if (!i2d_PKCS7_bio(out_bio, token))
 695                 goto end;
 696         } else {
 697             if (!i2d_TS_RESP_bio(out_bio, response))
 698                 goto end;
 699         }
 700     }
 701
 702     ret = 1;
 703
 704  end:
 705     ERR_print_errors(bio_err);
 706
 707     /* Clean up. */
 708     BIO_free_all(in_bio);
 709     BIO_free_all(query_bio);
 710     BIO_free_all(inkey_bio);
 711     BIO_free_all(signer_bio);
 712     BIO_free_all(out_bio);
 713     TS_RESP_free(response);
 714
 715     return ret;
 716 }
 717
 718 /* Reads a PKCS7 token and adds default 'granted' status info to it. */
 719 static TS_RESP *read_PKCS7(BIO *in_bio)
 720 {
 721     int ret = 0;
 722     PKCS7 *token = NULL;
 723     TS_TST_INFO *tst_info = NULL;
 724     TS_RESP *resp = NULL;
 725     TS_STATUS_INFO *si = NULL;
 726
 727     /* Read PKCS7 object and extract the signed time stamp info. */
 728     if (!(token = d2i_PKCS7_bio(in_bio, NULL)))
 729         goto end;
 730     if (!(tst_info = PKCS7_to_TS_TST_INFO(token)))
 731         goto end;
 732
 733     /* Creating response object. */
 734     if (!(resp = TS_RESP_new()))
 735         goto end;
 736
 737     /* Create granted status info. */
 738     if (!(si = TS_STATUS_INFO_new()))
 739         goto end;
 740     if (!(ASN1_INTEGER_set(si->status, TS_STATUS_GRANTED)))
 741         goto end;
 742     if (!TS_RESP_set_status_info(resp, si))
 743         goto end;
 744
 745     /* Setting encapsulated token. */
 746     TS_RESP_set_tst_info(resp, token, tst_info);
 747     token = NULL;               /* Ownership is lost. */
 748     tst_info = NULL;            /* Ownership is lost. */
 749
 750     ret = 1;
 751  end:
 752     PKCS7_free(token);
 753     TS_TST_INFO_free(tst_info);
 754     if (!ret) {
 755         TS_RESP_free(resp);
 756         resp = NULL;
 757     }
 758     TS_STATUS_INFO_free(si);
 759     return resp;
 760 }
 761
 762 static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
 763                                 char *queryfile, char *passin,
 764                                 char *inkey, char *signer, char *chain,
 765                                 const char *policy)
 766 {
 767     int ret = 0;
 768     TS_RESP *response = NULL;
 769     BIO *query_bio = NULL;
 770     TS_RESP_CTX *resp_ctx = NULL;
 771
 772     if (!(query_bio = BIO_new_file(queryfile, "rb")))
 773         goto end;
 774
 775     /* Getting TSA configuration section. */
 776     if (!(section = TS_CONF_get_tsa_section(conf, section)))
 777         goto end;
 778
 779     /* Setting up response generation context. */
 780     if (!(resp_ctx = TS_RESP_CTX_new()))
 781         goto end;
 782
 783     /* Setting serial number provider callback. */
 784     if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx))
 785         goto end;
 786 #ifndef OPENSSL_NO_ENGINE
 787     /* Setting default OpenSSL engine. */
 788     if (!TS_CONF_set_crypto_device(conf, section, engine))
 789         goto end;
 790 #endif
 791
 792     /* Setting TSA signer certificate. */
 793     if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx))
 794         goto end;
 795
 796     /* Setting TSA signer certificate chain. */
 797     if (!TS_CONF_set_certs(conf, section, chain, resp_ctx))
 798         goto end;
 799
 800     /* Setting TSA signer private key. */
 801     if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx))
 802         goto end;
 803
 804     /* Setting default policy OID. */
 805     if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx))
 806         goto end;
 807
 808     /* Setting acceptable policy OIDs. */
 809     if (!TS_CONF_set_policies(conf, section, resp_ctx))
 810         goto end;
 811
 812     /* Setting the acceptable one-way hash algorithms. */
 813     if (!TS_CONF_set_digests(conf, section, resp_ctx))
 814         goto end;
 815
 816     /* Setting guaranteed time stamp accuracy. */
 817     if (!TS_CONF_set_accuracy(conf, section, resp_ctx))
 818         goto end;
 819
 820     /* Setting the precision of the time. */
 821     if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx))
 822         goto end;
 823
 824     /* Setting the ordering flaf if requested. */
 825     if (!TS_CONF_set_ordering(conf, section, resp_ctx))
 826         goto end;
 827
 828     /* Setting the TSA name required flag if requested. */
 829     if (!TS_CONF_set_tsa_name(conf, section, resp_ctx))
 830         goto end;
 831
 832     /* Setting the ESS cert id chain flag if requested. */
 833     if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx))
 834         goto end;
 835
 836     /* Creating the response. */
 837     if (!(response = TS_RESP_create_response(resp_ctx, query_bio)))
 838         goto end;
 839
 840     ret = 1;
 841  end:
 842     if (!ret) {
 843         TS_RESP_free(response);
 844         response = NULL;
 845     }
 846     TS_RESP_CTX_free(resp_ctx);
 847     BIO_free_all(query_bio);
 848
 849     return response;
 850 }
 851
 852 static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data)
 853 {
 854     const char *serial_file = (const char *)data;
 855     ASN1_INTEGER *serial = next_serial(serial_file);
 856
 857     if (!serial) {
 858         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 859                                     "Error during serial number "
 860                                     "generation.");
 861         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_ADD_INFO_NOT_AVAILABLE);
 862     } else
 863         save_ts_serial(serial_file, serial);
 864
 865     return serial;
 866 }
 867
 868 static ASN1_INTEGER *next_serial(const char *serialfile)
 869 {
 870     int ret = 0;
 871     BIO *in = NULL;
 872     ASN1_INTEGER *serial = NULL;
 873     BIGNUM *bn = NULL;
 874
 875     if (!(serial = ASN1_INTEGER_new()))
 876         goto err;
 877
 878     if (!(in = BIO_new_file(serialfile, "r"))) {
 879         ERR_clear_error();
 880         BIO_printf(bio_err, "Warning: could not open file %s for "
 881                    "reading, using serial number: 1\n", serialfile);
 882         if (!ASN1_INTEGER_set(serial, 1))
 883             goto err;
 884     } else {
 885         char buf[1024];
 886         if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf))) {
 887             BIO_printf(bio_err, "unable to load number from %s\n",
 888                        serialfile);
 889             goto err;
 890         }
 891         if (!(bn = ASN1_INTEGER_to_BN(serial, NULL)))
 892             goto err;
 893         ASN1_INTEGER_free(serial);
 894         serial = NULL;
 895         if (!BN_add_word(bn, 1))
 896             goto err;
 897         if (!(serial = BN_to_ASN1_INTEGER(bn, NULL)))
 898             goto err;
 899     }
 900     ret = 1;
 901  err:
 902     if (!ret) {
 903         ASN1_INTEGER_free(serial);
 904         serial = NULL;
 905     }
 906     BIO_free_all(in);
 907     BN_free(bn);
 908     return serial;
 909 }
 910
 911 static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial)
 912 {
 913     int ret = 0;
 914     BIO *out = NULL;
 915
 916     if (!(out = BIO_new_file(serialfile, "w")))
 917         goto err;
 918     if (i2a_ASN1_INTEGER(out, serial) <= 0)
 919         goto err;
 920     if (BIO_puts(out, "\n") <= 0)
 921         goto err;
 922     ret = 1;
 923  err:
 924     if (!ret)
 925         BIO_printf(bio_err, "could not save serial number to %s\n",
 926                    serialfile);
 927     BIO_free_all(out);
 928     return ret;
 929 }
 930
 931 /*
 932  * Verify-related method definitions.
 933  */
 934
 935 static int verify_command(char *data, char *digest, char *queryfile,
 936                           char *in, int token_in,
 937                           char *CApath, char *CAfile, char *untrusted)
 938 {
 939     BIO *in_bio = NULL;
 940     PKCS7 *token = NULL;
 941     TS_RESP *response = NULL;
 942     TS_VERIFY_CTX *verify_ctx = NULL;
 943     int ret = 0;
 944
 945     /* Decode the token (PKCS7) or response (TS_RESP) files. */
 946     if (!(in_bio = BIO_new_file(in, "rb")))
 947         goto end;
 948     if (token_in) {
 949         if (!(token = d2i_PKCS7_bio(in_bio, NULL)))
 950             goto end;
 951     } else {
 952         if (!(response = d2i_TS_RESP_bio(in_bio, NULL)))
 953             goto end;
 954     }
 955
 956     if (!(verify_ctx = create_verify_ctx(data, digest, queryfile,
 957                                          CApath, CAfile, untrusted)))
 958         goto end;
 959
 960     /* Checking the token or response against the request. */
 961     ret = token_in ?
 962         TS_RESP_verify_token(verify_ctx, token) :
 963         TS_RESP_verify_response(verify_ctx, response);
 964
 965  end:
 966     printf("Verification: ");
 967     if (ret)
 968         printf("OK\n");
 969     else {
 970         printf("FAILED\n");
 971         /* Print errors, if there are any. */
 972         ERR_print_errors(bio_err);
 973     }
 974
 975     /* Clean up. */
 976     BIO_free_all(in_bio);
 977     PKCS7_free(token);
 978     TS_RESP_free(response);
 979     TS_VERIFY_CTX_free(verify_ctx);
 980     return ret;
 981 }
 982
 983 static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
 984                                         char *queryfile,
 985                                         char *CApath, char *CAfile,
 986                                         char *untrusted)
 987 {
 988     TS_VERIFY_CTX *ctx = NULL;
 989     BIO *input = NULL;
 990     TS_REQ *request = NULL;
 991     int ret = 0;
 992
 993     if (data != NULL || digest != NULL) {
 994         if (!(ctx = TS_VERIFY_CTX_new()))
 995             goto err;
 996         ctx->flags = TS_VFY_VERSION | TS_VFY_SIGNER;
 997         if (data != NULL) {
 998             ctx->flags |= TS_VFY_DATA;
 999             if (!(ctx->data = BIO_new_file(data, "rb")))
1000                 goto err;
1001         } else if (digest != NULL) {
1002             long imprint_len;
1003             ctx->flags |= TS_VFY_IMPRINT;
1004             if (!(ctx->imprint = string_to_hex(digest, &imprint_len))) {
1005                 BIO_printf(bio_err, "invalid digest string\n");
1006                 goto err;
1007             }
1008             ctx->imprint_len = imprint_len;
1009         }
1010
1011     } else if (queryfile != NULL) {
1012         /*
1013          * The request has just to be read, decoded and converted to a verify
1014          * context object.
1015          */
1016         if (!(input = BIO_new_file(queryfile, "rb")))
1017             goto err;
1018         if (!(request = d2i_TS_REQ_bio(input, NULL)))
1019             goto err;
1020         if (!(ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL)))
1021             goto err;
1022     } else
1023         return NULL;
1024
1025     /* Add the signature verification flag and arguments. */
1026     ctx->flags |= TS_VFY_SIGNATURE;
1027
1028     /* Initialising the X509_STORE object. */
1029     if (!(ctx->store = create_cert_store(CApath, CAfile)))
1030         goto err;
1031
1032     /* Loading untrusted certificates. */
1033     if (untrusted && !(ctx->certs = TS_CONF_load_certs(untrusted)))
1034         goto err;
1035
1036     ret = 1;
1037  err:
1038     if (!ret) {
1039         TS_VERIFY_CTX_free(ctx);
1040         ctx = NULL;
1041     }
1042     BIO_free_all(input);
1043     TS_REQ_free(request);
1044     return ctx;
1045 }
1046
1047 static X509_STORE *create_cert_store(char *CApath, char *CAfile)
1048 {
1049     X509_STORE *cert_ctx = NULL;
1050     X509_LOOKUP *lookup = NULL;
1051     int i;
1052
1053     /* Creating the X509_STORE object. */
1054     cert_ctx = X509_STORE_new();
1055
1056     /* Setting the callback for certificate chain verification. */
1057     X509_STORE_set_verify_cb(cert_ctx, verify_cb);
1058
1059     /* Adding a trusted certificate directory source. */
1060     if (CApath) {
1061         lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
1062         if (lookup == NULL) {
1063             BIO_printf(bio_err, "memory allocation failure\n");
1064             goto err;
1065         }
1066         i = X509_LOOKUP_add_dir(lookup, CApath, X509_FILETYPE_PEM);
1067         if (!i) {
1068             BIO_printf(bio_err, "Error loading directory %s\n", CApath);
1069             goto err;
1070         }
1071     }
1072
1073     /* Adding a trusted certificate file source. */
1074     if (CAfile) {
1075         lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
1076         if (lookup == NULL) {
1077             BIO_printf(bio_err, "memory allocation failure\n");
1078             goto err;
1079         }
1080         i = X509_LOOKUP_load_file(lookup, CAfile, X509_FILETYPE_PEM);
1081         if (!i) {
1082             BIO_printf(bio_err, "Error loading file %s\n", CAfile);
1083             goto err;
1084         }
1085     }
1086
1087     return cert_ctx;
1088  err:
1089     X509_STORE_free(cert_ctx);
1090     return NULL;
1091 }
1092
1093 static int verify_cb(int ok, X509_STORE_CTX *ctx)
1094 {
1095     return ok;
1096 }