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 <openssl/opensslconf.h>
  60 #ifdef OPENSSL_NO_TS
  61 NON_EMPTY_TRANSLATION_UNIT
  62 #else
  63 # include <stdio.h>
  64 # include <stdlib.h>
  65 # include <string.h>
  66 # include "apps.h"
  67 # include <openssl/bio.h>
  68 # include <openssl/err.h>
  69 # include <openssl/pem.h>
  70 # include <openssl/rand.h>
  71 # include <openssl/ts.h>
  72 # include <openssl/bn.h>
  73
  74 /* Request nonce length, in bits (must be a multiple of 8). */
  75 # define NONCE_LENGTH            64
  76
  77 /* Name of config entry that defines the OID file. */
  78 # define ENV_OID_FILE            "oid_file"
  79
  80 /* Is |EXACTLY_ONE| of three pointers set? */
  81 # define EXACTLY_ONE(a, b, c) \
  82         (( a && !b && !c) || \
  83          ( b && !a && !c) || \
  84          ( c && !a && !b))
  85
  86 static ASN1_OBJECT *txt2obj(const char *oid);
  87 static CONF *load_config_file(const char *configfile);
  88
  89 /* Query related functions. */
  90 static int query_command(const char *data, char *digest,
  91                          const EVP_MD *md, const char *policy, int no_nonce,
  92                          int cert, const char *in, const char *out, int text);
  93 static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
  94                             const char *policy, int no_nonce, int cert);
  95 static int create_digest(BIO *input, char *digest,
  96                          const EVP_MD *md, unsigned char **md_value);
  97 static ASN1_INTEGER *create_nonce(int bits);
  98
  99 /* Reply related functions. */
 100 static int reply_command(CONF *conf, char *section, char *engine,
 101                          char *queryfile, char *passin, char *inkey,
 102                          const EVP_MD *md, char *signer, char *chain,
 103                          const char *policy, char *in, int token_in,
 104                          char *out, int token_out, int text);
 105 static TS_RESP *read_PKCS7(BIO *in_bio);
 106 static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
 107                                 char *queryfile, char *passin,
 108                                 char *inkey, const EVP_MD *md, char *signer,
 109                                 char *chain, const char *policy);
 110 static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data);
 111 static ASN1_INTEGER *next_serial(const char *serialfile);
 112 static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial);
 113
 114 /* Verify related functions. */
 115 static int verify_command(char *data, char *digest, char *queryfile,
 116                           char *in, int token_in,
 117                           char *CApath, char *CAfile, char *untrusted,
 118                           X509_VERIFY_PARAM *vpm);
 119 static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
 120                                         char *queryfile,
 121                                         char *CApath, char *CAfile,
 122                                         char *untrusted,
 123                                         X509_VERIFY_PARAM *vpm);
 124 static X509_STORE *create_cert_store(char *CApath, char *CAfile,
 125                                      X509_VERIFY_PARAM *vpm);
 126 static int verify_cb(int ok, X509_STORE_CTX *ctx);
 127
 128 typedef enum OPTION_choice {
 129     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 130     OPT_ENGINE, OPT_CONFIG, OPT_SECTION, OPT_QUERY, OPT_DATA,
 131     OPT_DIGEST, OPT_RAND, OPT_TSPOLICY, OPT_NO_NONCE, OPT_CERT,
 132     OPT_IN, OPT_TOKEN_IN, OPT_OUT, OPT_TOKEN_OUT, OPT_TEXT,
 133     OPT_REPLY, OPT_QUERYFILE, OPT_PASSIN, OPT_INKEY, OPT_SIGNER,
 134     OPT_CHAIN, OPT_VERIFY, OPT_CAPATH, OPT_CAFILE, OPT_UNTRUSTED,
 135     OPT_MD, OPT_V_ENUM
 136 } OPTION_CHOICE;
 137
 138 OPTIONS ts_options[] = {
 139     {"help", OPT_HELP, '-', "Display this summary"},
 140     {"config", OPT_CONFIG, '<', "Configuration file"},
 141     {"section", OPT_SECTION, 's', "Section to use within config file"},
 142     {"query", OPT_QUERY, '-', "Generate a TS query"},
 143     {"data", OPT_DATA, '<', "File to hash"},
 144     {"digest", OPT_DIGEST, 's', "Digest (as a hex string)"},
 145     {"rand", OPT_RAND, 's',
 146      "Load the file(s) into the random number generator"},
 147     {"tspolicy", OPT_TSPOLICY, 's', "Policy OID to use"},
 148     {"no_nonce", OPT_NO_NONCE, '-', "Do not include a nonce"},
 149     {"cert", OPT_CERT, '-', "Put cert request into query"},
 150     {"in", OPT_IN, '<', "Input file"},
 151     {"token_in", OPT_TOKEN_IN, '-', "Input is a PKCS#7 file"},
 152     {"out", OPT_OUT, '>', "Output file"},
 153     {"token_out", OPT_TOKEN_OUT, '-', "Output is a PKCS#7 file"},
 154     {"text", OPT_TEXT, '-', "Output text (not DER)"},
 155     {"reply", OPT_REPLY, '-', "Generate a TS reply"},
 156     {"queryfile", OPT_QUERYFILE, '<', "File containing a TS query"},
 157     {"passin", OPT_PASSIN, 's'},
 158     {"inkey", OPT_INKEY, '<', "File with private key for reply"},
 159     {"signer", OPT_SIGNER, 's'},
 160     {"chain", OPT_CHAIN, '<', "File with signer CA chain"},
 161     {"verify", OPT_VERIFY, '-', "Verify a TS response"},
 162     {"CApath", OPT_CAPATH, '/', "Path to trusted CA files"},
 163     {"CAfile", OPT_CAFILE, '<', "File with trusted CA certs"},
 164     {"untrusted", OPT_UNTRUSTED, '<', "File with untrusted certs"},
 165     {"", OPT_MD, '-', "Any supported digest"},
 166 # ifndef OPENSSL_NO_ENGINE
 167     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 168 # endif
 169     {OPT_HELP_STR, 1, '-', "\nOptions specific to 'ts -verify': \n"},
 170     OPT_V_OPTIONS,
 171     {OPT_HELP_STR, 1, '-', "\n"},
 172     {NULL}
 173 };
 174
 175 /*
 176  * This comand is so complex, special help is needed.
 177  */
 178 static char* opt_helplist[] = {
 179     "Typical uses:",
 180     "ts -query [-rand file...] [-config file] [-data file]",
 181     "          [-digest hexstring] [-tspolicy oid] [-no_nonce] [-cert]",
 182     "          [-in file] [-out file] [-text]",
 183     "  or",
 184     "ts -reply [-config file] [-section tsa_section]",
 185     "          [-queryfile file] [-passin password]",
 186     "          [-signer tsa_cert.pem] [-inkey private_key.pem]",
 187     "          [-chain certs_file.pem] [-tspolicy oid]",
 188     "          [-in file] [-token_in] [-out file] [-token_out]",
 189 # ifndef OPENSSL_NO_ENGINE
 190     "          [-text]",
 191 # else
 192     "          [-text] [-engine id]",
 193 # endif
 194     "  or",
 195     "ts -verify -CApath dir -CAfile file.pem -untrusted file.pem",
 196     "           [-data file] [-digest hexstring]",
 197     "           [-queryfile file] -in file [-token_in]",
 198     "           [[options specific to 'ts -verify']]",
 199     NULL,
 200 };
 201
 202 int ts_main(int argc, char **argv)
 203 {
 204     CONF *conf = NULL;
 205     char *CAfile = NULL, *untrusted = NULL, *engine = NULL, *prog, **helpp;
 206     char *configfile = default_config_file;
 207     char *section = NULL, *password = NULL;
 208     char *data = NULL, *digest = NULL, *rnd = NULL, *policy = NULL;
 209     char *in = NULL, *out = NULL, *queryfile = NULL, *passin = NULL;
 210     char *inkey = NULL, *signer = NULL, *chain = NULL, *CApath = NULL;
 211     const EVP_MD *md = NULL;
 212     OPTION_CHOICE o, mode = OPT_ERR;
 213     int ret = 1, no_nonce = 0, cert = 0, text = 0;
 214     int vpmtouched = 0;
 215     X509_VERIFY_PARAM *vpm = NULL;
 216     /* Input is ContentInfo instead of TimeStampResp. */
 217     int token_in = 0;
 218     /* Output is ContentInfo instead of TimeStampResp. */
 219     int token_out = 0;
 220
 221     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 222         goto end;
 223
 224     prog = opt_init(argc, argv, ts_options);
 225     while ((o = opt_next()) != OPT_EOF) {
 226         switch (o) {
 227         case OPT_EOF:
 228         case OPT_ERR:
 229  opthelp:
 230             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 231             goto end;
 232         case OPT_HELP:
 233             opt_help(ts_options);
 234             for (helpp = opt_helplist; *helpp; ++helpp)
 235                 BIO_printf(bio_err, "%s\n", *helpp);
 236             ret = 0;
 237             goto end;
 238         case OPT_CONFIG:
 239             configfile = opt_arg();
 240             break;
 241         case OPT_SECTION:
 242             section = opt_arg();
 243             break;
 244         case OPT_QUERY:
 245         case OPT_REPLY:
 246         case OPT_VERIFY:
 247             if (mode != OPT_ERR)
 248                 goto opthelp;
 249             mode = o;
 250             break;
 251         case OPT_DATA:
 252             data = opt_arg();
 253             break;
 254         case OPT_DIGEST:
 255             digest = opt_arg();
 256             break;
 257         case OPT_RAND:
 258             rnd = opt_arg();
 259             break;
 260         case OPT_TSPOLICY:
 261             policy = opt_arg();
 262             break;
 263         case OPT_NO_NONCE:
 264             no_nonce = 1;
 265             break;
 266         case OPT_CERT:
 267             cert = 1;
 268             break;
 269         case OPT_IN:
 270             in = opt_arg();
 271             break;
 272         case OPT_TOKEN_IN:
 273             token_in = 1;
 274             break;
 275         case OPT_OUT:
 276             out = opt_arg();
 277             break;
 278         case OPT_TOKEN_OUT:
 279             token_out = 1;
 280             break;
 281         case OPT_TEXT:
 282             text = 1;
 283             break;
 284         case OPT_QUERYFILE:
 285             queryfile = opt_arg();
 286             break;
 287         case OPT_PASSIN:
 288             passin = opt_arg();
 289             break;
 290         case OPT_INKEY:
 291             inkey = opt_arg();
 292             break;
 293         case OPT_SIGNER:
 294             signer = opt_arg();
 295             break;
 296         case OPT_CHAIN:
 297             chain = opt_arg();
 298             break;
 299         case OPT_CAPATH:
 300             CApath = opt_arg();
 301             break;
 302         case OPT_CAFILE:
 303             CAfile = opt_arg();
 304             break;
 305         case OPT_UNTRUSTED:
 306             untrusted = opt_arg();
 307             break;
 308         case OPT_ENGINE:
 309             engine = opt_arg();
 310             break;
 311         case OPT_MD:
 312             if (!opt_md(opt_unknown(), &md))
 313                 goto opthelp;
 314             break;
 315         case OPT_V_CASES:
 316             if (!opt_verify(o, vpm))
 317                 goto end;
 318             vpmtouched++;
 319             break;
 320         }
 321     }
 322     argc = opt_num_rest();
 323     argv = opt_rest();
 324     if (mode == OPT_ERR || argc != 0)
 325         goto opthelp;
 326
 327     /* Seed the random number generator if it is going to be used. */
 328     if (mode == OPT_QUERY && !no_nonce) {
 329         if (!app_RAND_load_file(NULL, 1) && rnd == NULL)
 330             BIO_printf(bio_err, "warning, not much extra random "
 331                        "data, consider using the -rand option\n");
 332         if (rnd != NULL)
 333             BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
 334                        app_RAND_load_files(rnd));
 335     }
 336
 337     if (mode == OPT_REPLY && passin &&
 338         !app_passwd(passin, NULL, &password, NULL)) {
 339         BIO_printf(bio_err, "Error getting password.\n");
 340         goto end;
 341     }
 342
 343     conf = load_config_file(configfile);
 344     if (!app_load_modules(conf))
 345         goto end;
 346
 347     /* Check parameter consistency and execute the appropriate function. */
 348     switch (mode) {
 349     default:
 350     case OPT_ERR:
 351         goto opthelp;
 352     case OPT_QUERY:
 353         if (vpmtouched)
 354             goto opthelp;
 355         if ((data != NULL) && (digest != NULL))
 356             goto opthelp;
 357         ret = !query_command(data, digest, md, policy, no_nonce, cert,
 358                              in, out, text);
 359         break;
 360     case OPT_REPLY:
 361         if (vpmtouched)
 362             goto opthelp;
 363         if ((in != NULL) && (queryfile != NULL))
 364             goto opthelp;
 365         if (in == NULL) {
 366             if ((conf == NULL) || (token_in != 0))
 367                 goto opthelp;
 368         }
 369         ret = !reply_command(conf, section, engine, queryfile,
 370                              password, inkey, md, signer, chain, policy,
 371                              in, token_in, out, token_out, text);
 372         break;
 373     case OPT_VERIFY:
 374         if ((in == NULL) || !EXACTLY_ONE(queryfile, data, digest))
 375             goto opthelp;
 376         ret = !verify_command(data, digest, queryfile, in, token_in,
 377                               CApath, CAfile, untrusted,
 378                               vpmtouched ? vpm : NULL);
 379     }
 380
 381  end:
 382     X509_VERIFY_PARAM_free(vpm);
 383     app_RAND_write_file(NULL);
 384     NCONF_free(conf);
 385     OPENSSL_free(password);
 386     return (ret);
 387 }
 388
 389 /*
 390  * Configuration file-related function definitions.
 391  */
 392
 393 static ASN1_OBJECT *txt2obj(const char *oid)
 394 {
 395     ASN1_OBJECT *oid_obj = NULL;
 396
 397     if ((oid_obj = OBJ_txt2obj(oid, 0)) == NULL)
 398         BIO_printf(bio_err, "cannot convert %s to OID\n", oid);
 399
 400     return oid_obj;
 401 }
 402
 403 static CONF *load_config_file(const char *configfile)
 404 {
 405     CONF *conf = app_load_config(configfile);
 406
 407     if (conf != NULL) {
 408         const char *p;
 409
 410         BIO_printf(bio_err, "Using configuration from %s\n", configfile);
 411         p = NCONF_get_string(conf, NULL, ENV_OID_FILE);
 412         if (p != NULL) {
 413             BIO *oid_bio = BIO_new_file(p, "r");
 414             if (!oid_bio)
 415                 ERR_print_errors(bio_err);
 416             else {
 417                 OBJ_create_objects(oid_bio);
 418                 BIO_free_all(oid_bio);
 419             }
 420         } else
 421             ERR_clear_error();
 422         if (!add_oid_section(conf))
 423             ERR_print_errors(bio_err);
 424     }
 425     return conf;
 426 }
 427
 428 /*
 429  * Query-related method definitions.
 430  */
 431 static int query_command(const char *data, char *digest, const EVP_MD *md,
 432                          const char *policy, int no_nonce,
 433                          int cert, const char *in, const char *out, int text)
 434 {
 435     int ret = 0;
 436     TS_REQ *query = NULL;
 437     BIO *in_bio = NULL;
 438     BIO *data_bio = NULL;
 439     BIO *out_bio = NULL;
 440
 441     /* Build query object. */
 442     if (in != NULL) {
 443         if ((in_bio = bio_open_default(in, 'r', FORMAT_ASN1)) == NULL)
 444             goto end;
 445         query = d2i_TS_REQ_bio(in_bio, NULL);
 446     } else {
 447         if (digest == NULL
 448             && (data_bio = bio_open_default(data, 'r', FORMAT_ASN1)) == NULL)
 449             goto end;
 450         query = create_query(data_bio, digest, md, policy, no_nonce, cert);
 451     }
 452     if (query == NULL)
 453         goto end;
 454
 455     if (text) {
 456         if ((out_bio = bio_open_default(out, 'w', FORMAT_TEXT)) == NULL)
 457             goto end;
 458         if (!TS_REQ_print_bio(out_bio, query))
 459             goto end;
 460     } else {
 461         if ((out_bio = bio_open_default(out, 'w', FORMAT_ASN1)) == NULL)
 462             goto end;
 463         if (!i2d_TS_REQ_bio(out_bio, query))
 464             goto end;
 465     }
 466
 467     ret = 1;
 468
 469  end:
 470     ERR_print_errors(bio_err);
 471     BIO_free_all(in_bio);
 472     BIO_free_all(data_bio);
 473     BIO_free_all(out_bio);
 474     TS_REQ_free(query);
 475     return ret;
 476 }
 477
 478 static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
 479                             const char *policy, int no_nonce, int cert)
 480 {
 481     int ret = 0;
 482     TS_REQ *ts_req = NULL;
 483     int len;
 484     TS_MSG_IMPRINT *msg_imprint = NULL;
 485     X509_ALGOR *algo = NULL;
 486     unsigned char *data = NULL;
 487     ASN1_OBJECT *policy_obj = NULL;
 488     ASN1_INTEGER *nonce_asn1 = NULL;
 489
 490     if (md == NULL && (md = EVP_get_digestbyname("sha1")) == NULL)
 491         goto err;
 492     if ((ts_req = TS_REQ_new()) == NULL)
 493         goto err;
 494     if (!TS_REQ_set_version(ts_req, 1))
 495         goto err;
 496     if ((msg_imprint = TS_MSG_IMPRINT_new()) == NULL)
 497         goto err;
 498     if ((algo = X509_ALGOR_new()) == NULL)
 499         goto err;
 500     if ((algo->algorithm = OBJ_nid2obj(EVP_MD_type(md))) == NULL)
 501         goto err;
 502     if ((algo->parameter = ASN1_TYPE_new()) == NULL)
 503         goto err;
 504     algo->parameter->type = V_ASN1_NULL;
 505     if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo))
 506         goto err;
 507     if ((len = create_digest(data_bio, digest, md, &data)) == 0)
 508         goto err;
 509     if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len))
 510         goto err;
 511     if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint))
 512         goto err;
 513     if (policy && (policy_obj = txt2obj(policy)) == NULL)
 514         goto err;
 515     if (policy_obj && !TS_REQ_set_policy_id(ts_req, policy_obj))
 516         goto err;
 517
 518     /* Setting nonce if requested. */
 519     if (!no_nonce && (nonce_asn1 = create_nonce(NONCE_LENGTH)) == NULL)
 520         goto err;
 521     if (nonce_asn1 && !TS_REQ_set_nonce(ts_req, nonce_asn1))
 522         goto err;
 523     if (!TS_REQ_set_cert_req(ts_req, cert))
 524         goto err;
 525
 526     ret = 1;
 527  err:
 528     if (!ret) {
 529         TS_REQ_free(ts_req);
 530         ts_req = NULL;
 531         BIO_printf(bio_err, "could not create query\n");
 532         ERR_print_errors(bio_err);
 533     }
 534     TS_MSG_IMPRINT_free(msg_imprint);
 535     X509_ALGOR_free(algo);
 536     OPENSSL_free(data);
 537     ASN1_OBJECT_free(policy_obj);
 538     ASN1_INTEGER_free(nonce_asn1);
 539     return ts_req;
 540 }
 541
 542 static int create_digest(BIO *input, char *digest, const EVP_MD *md,
 543                          unsigned char **md_value)
 544 {
 545     int md_value_len;
 546
 547     md_value_len = EVP_MD_size(md);
 548     if (md_value_len < 0)
 549         return 0;
 550
 551     if (input) {
 552         EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
 553         unsigned char buffer[4096];
 554         int length;
 555
 556         if (md_ctx == NULL)
 557             return 0;
 558         *md_value = app_malloc(md_value_len, "digest buffer");
 559         EVP_DigestInit(md_ctx, md);
 560         while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) {
 561             EVP_DigestUpdate(md_ctx, buffer, length);
 562         }
 563         if (!EVP_DigestFinal(md_ctx, *md_value, NULL)) {
 564             EVP_MD_CTX_free(md_ctx);
 565             return 0;
 566         }
 567         EVP_MD_CTX_free(md_ctx);
 568     } else {
 569         long digest_len;
 570         *md_value = string_to_hex(digest, &digest_len);
 571         if (!*md_value || md_value_len != digest_len) {
 572             OPENSSL_free(*md_value);
 573             *md_value = NULL;
 574             BIO_printf(bio_err, "bad digest, %d bytes "
 575                        "must be specified\n", md_value_len);
 576             return 0;
 577         }
 578     }
 579     return md_value_len;
 580 }
 581
 582 static ASN1_INTEGER *create_nonce(int bits)
 583 {
 584     unsigned char buf[20];
 585     ASN1_INTEGER *nonce = NULL;
 586     int len = (bits - 1) / 8 + 1;
 587     int i;
 588
 589     if (len > (int)sizeof(buf))
 590         goto err;
 591     if (RAND_bytes(buf, len) <= 0)
 592         goto err;
 593
 594     /* Find the first non-zero byte and creating ASN1_INTEGER object. */
 595     for (i = 0; i < len && !buf[i]; ++i)
 596         continue;
 597     if ((nonce = ASN1_INTEGER_new()) == NULL)
 598         goto err;
 599     OPENSSL_free(nonce->data);
 600     nonce->length = len - i;
 601     nonce->data = app_malloc(nonce->length + 1, "nonce buffer");
 602     memcpy(nonce->data, buf + i, nonce->length);
 603     return nonce;
 604
 605  err:
 606     BIO_printf(bio_err, "could not create nonce\n");
 607     ASN1_INTEGER_free(nonce);
 608     return NULL;
 609 }
 610
 611 /*
 612  * Reply-related method definitions.
 613  */
 614
 615 static int reply_command(CONF *conf, char *section, char *engine,
 616                          char *queryfile, char *passin, char *inkey,
 617                          const EVP_MD *md, char *signer, char *chain,
 618                          const char *policy, char *in, int token_in,
 619                          char *out, int token_out, int text)
 620 {
 621     int ret = 0;
 622     TS_RESP *response = NULL;
 623     BIO *in_bio = NULL;
 624     BIO *query_bio = NULL;
 625     BIO *inkey_bio = NULL;
 626     BIO *signer_bio = NULL;
 627     BIO *out_bio = NULL;
 628
 629     if (in != NULL) {
 630         if ((in_bio = BIO_new_file(in, "rb")) == NULL)
 631             goto end;
 632         if (token_in) {
 633             response = read_PKCS7(in_bio);
 634         } else {
 635             response = d2i_TS_RESP_bio(in_bio, NULL);
 636         }
 637     } else {
 638         response = create_response(conf, section, engine, queryfile,
 639                                    passin, inkey, md, signer, chain, policy);
 640         if (response)
 641             BIO_printf(bio_err, "Response has been generated.\n");
 642         else
 643             BIO_printf(bio_err, "Response is not generated.\n");
 644     }
 645     if (response == NULL)
 646         goto end;
 647
 648     /* Write response. */
 649     if (text) {
 650         if ((out_bio = bio_open_default(out, 'w', FORMAT_TEXT)) == NULL)
 651         goto end;
 652         if (token_out) {
 653             TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
 654             if (!TS_TST_INFO_print_bio(out_bio, tst_info))
 655                 goto end;
 656         } else {
 657             if (!TS_RESP_print_bio(out_bio, response))
 658                 goto end;
 659         }
 660     } else {
 661         if ((out_bio = bio_open_default(out, 'w', FORMAT_ASN1)) == NULL)
 662             goto end;
 663         if (token_out) {
 664             PKCS7 *token = TS_RESP_get_token(response);
 665             if (!i2d_PKCS7_bio(out_bio, token))
 666                 goto end;
 667         } else {
 668             if (!i2d_TS_RESP_bio(out_bio, response))
 669                 goto end;
 670         }
 671     }
 672
 673     ret = 1;
 674
 675  end:
 676     ERR_print_errors(bio_err);
 677     BIO_free_all(in_bio);
 678     BIO_free_all(query_bio);
 679     BIO_free_all(inkey_bio);
 680     BIO_free_all(signer_bio);
 681     BIO_free_all(out_bio);
 682     TS_RESP_free(response);
 683     return ret;
 684 }
 685
 686 /* Reads a PKCS7 token and adds default 'granted' status info to it. */
 687 static TS_RESP *read_PKCS7(BIO *in_bio)
 688 {
 689     int ret = 0;
 690     PKCS7 *token = NULL;
 691     TS_TST_INFO *tst_info = NULL;
 692     TS_RESP *resp = NULL;
 693     TS_STATUS_INFO *si = NULL;
 694
 695     if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)
 696         goto end;
 697     if ((tst_info = PKCS7_to_TS_TST_INFO(token)) == NULL)
 698         goto end;
 699     if ((resp = TS_RESP_new()) == NULL)
 700         goto end;
 701     if ((si = TS_STATUS_INFO_new()) == NULL)
 702         goto end;
 703     if (!TS_STATUS_INFO_set_status(si, TS_STATUS_GRANTED))
 704         goto end;
 705     if (!TS_RESP_set_status_info(resp, si))
 706         goto end;
 707     TS_RESP_set_tst_info(resp, token, tst_info);
 708     token = NULL;               /* Ownership is lost. */
 709     tst_info = NULL;            /* Ownership is lost. */
 710     ret = 1;
 711
 712  end:
 713     PKCS7_free(token);
 714     TS_TST_INFO_free(tst_info);
 715     if (!ret) {
 716         TS_RESP_free(resp);
 717         resp = NULL;
 718     }
 719     TS_STATUS_INFO_free(si);
 720     return resp;
 721 }
 722
 723 static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
 724                                 char *queryfile, char *passin,
 725                                 char *inkey, const EVP_MD *md, char *signer,
 726                                 char *chain, const char *policy)
 727 {
 728     int ret = 0;
 729     TS_RESP *response = NULL;
 730     BIO *query_bio = NULL;
 731     TS_RESP_CTX *resp_ctx = NULL;
 732
 733     if ((query_bio = BIO_new_file(queryfile, "rb")) == NULL)
 734         goto end;
 735     if ((section = TS_CONF_get_tsa_section(conf, section)) == NULL)
 736         goto end;
 737     if ((resp_ctx = TS_RESP_CTX_new()) == NULL)
 738         goto end;
 739     if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx))
 740         goto end;
 741 # ifndef OPENSSL_NO_ENGINE
 742     if (!TS_CONF_set_crypto_device(conf, section, engine))
 743         goto end;
 744 # endif
 745     if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx))
 746         goto end;
 747     if (!TS_CONF_set_certs(conf, section, chain, resp_ctx))
 748         goto end;
 749     if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx))
 750         goto end;
 751
 752     if (md) {
 753         if (!TS_RESP_CTX_set_signer_digest(resp_ctx, md))
 754             goto end;
 755     } else if (!TS_CONF_set_signer_digest(conf, section, NULL, resp_ctx)) {
 756             goto end;
 757     }
 758
 759     if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx))
 760         goto end;
 761     if (!TS_CONF_set_policies(conf, section, resp_ctx))
 762         goto end;
 763     if (!TS_CONF_set_digests(conf, section, resp_ctx))
 764         goto end;
 765     if (!TS_CONF_set_accuracy(conf, section, resp_ctx))
 766         goto end;
 767     if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx))
 768         goto end;
 769     if (!TS_CONF_set_ordering(conf, section, resp_ctx))
 770         goto end;
 771     if (!TS_CONF_set_tsa_name(conf, section, resp_ctx))
 772         goto end;
 773     if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx))
 774         goto end;
 775     if ((response = TS_RESP_create_response(resp_ctx, query_bio)) == NULL)
 776         goto end;
 777     ret = 1;
 778
 779  end:
 780     if (!ret) {
 781         TS_RESP_free(response);
 782         response = NULL;
 783     }
 784     TS_RESP_CTX_free(resp_ctx);
 785     BIO_free_all(query_bio);
 786     return response;
 787 }
 788
 789 static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data)
 790 {
 791     const char *serial_file = (const char *)data;
 792     ASN1_INTEGER *serial = next_serial(serial_file);
 793
 794     if (!serial) {
 795         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 796                                     "Error during serial number "
 797                                     "generation.");
 798         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_ADD_INFO_NOT_AVAILABLE);
 799     } else
 800         save_ts_serial(serial_file, serial);
 801
 802     return serial;
 803 }
 804
 805 static ASN1_INTEGER *next_serial(const char *serialfile)
 806 {
 807     int ret = 0;
 808     BIO *in = NULL;
 809     ASN1_INTEGER *serial = NULL;
 810     BIGNUM *bn = NULL;
 811
 812     if ((serial = ASN1_INTEGER_new()) == NULL)
 813         goto err;
 814
 815     if ((in = BIO_new_file(serialfile, "r")) == NULL) {
 816         ERR_clear_error();
 817         BIO_printf(bio_err, "Warning: could not open file %s for "
 818                    "reading, using serial number: 1\n", serialfile);
 819         if (!ASN1_INTEGER_set(serial, 1))
 820             goto err;
 821     } else {
 822         char buf[1024];
 823         if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf))) {
 824             BIO_printf(bio_err, "unable to load number from %s\n",
 825                        serialfile);
 826             goto err;
 827         }
 828         if ((bn = ASN1_INTEGER_to_BN(serial, NULL)) == NULL)
 829             goto err;
 830         ASN1_INTEGER_free(serial);
 831         serial = NULL;
 832         if (!BN_add_word(bn, 1))
 833             goto err;
 834         if ((serial = BN_to_ASN1_INTEGER(bn, NULL)) == NULL)
 835             goto err;
 836     }
 837     ret = 1;
 838
 839  err:
 840     if (!ret) {
 841         ASN1_INTEGER_free(serial);
 842         serial = NULL;
 843     }
 844     BIO_free_all(in);
 845     BN_free(bn);
 846     return serial;
 847 }
 848
 849 static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial)
 850 {
 851     int ret = 0;
 852     BIO *out = NULL;
 853
 854     if ((out = BIO_new_file(serialfile, "w")) == NULL)
 855         goto err;
 856     if (i2a_ASN1_INTEGER(out, serial) <= 0)
 857         goto err;
 858     if (BIO_puts(out, "\n") <= 0)
 859         goto err;
 860     ret = 1;
 861  err:
 862     if (!ret)
 863         BIO_printf(bio_err, "could not save serial number to %s\n",
 864                    serialfile);
 865     BIO_free_all(out);
 866     return ret;
 867 }
 868
 869
 870 /*
 871  * Verify-related method definitions.
 872  */
 873
 874 static int verify_command(char *data, char *digest, char *queryfile,
 875                           char *in, int token_in,
 876                           char *CApath, char *CAfile, char *untrusted,
 877                           X509_VERIFY_PARAM *vpm)
 878 {
 879     BIO *in_bio = NULL;
 880     PKCS7 *token = NULL;
 881     TS_RESP *response = NULL;
 882     TS_VERIFY_CTX *verify_ctx = NULL;
 883     int ret = 0;
 884
 885     if ((in_bio = BIO_new_file(in, "rb")) == NULL)
 886         goto end;
 887     if (token_in) {
 888         if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)
 889             goto end;
 890     } else {
 891         if ((response = d2i_TS_RESP_bio(in_bio, NULL)) == NULL)
 892             goto end;
 893     }
 894
 895     if ((verify_ctx = create_verify_ctx(data, digest, queryfile,
 896                                         CApath, CAfile, untrusted,
 897                                         vpm)) == NULL)
 898         goto end;
 899
 900     ret = token_in
 901         ? TS_RESP_verify_token(verify_ctx, token)
 902         : TS_RESP_verify_response(verify_ctx, response);
 903
 904  end:
 905     printf("Verification: ");
 906     if (ret)
 907         printf("OK\n");
 908     else {
 909         printf("FAILED\n");
 910         ERR_print_errors(bio_err);
 911     }
 912
 913     BIO_free_all(in_bio);
 914     PKCS7_free(token);
 915     TS_RESP_free(response);
 916     TS_VERIFY_CTX_free(verify_ctx);
 917     return ret;
 918 }
 919
 920 static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest,
 921                                         char *queryfile,
 922                                         char *CApath, char *CAfile,
 923                                         char *untrusted,
 924                                         X509_VERIFY_PARAM *vpm)
 925 {
 926     TS_VERIFY_CTX *ctx = NULL;
 927     BIO *input = NULL;
 928     TS_REQ *request = NULL;
 929     int ret = 0;
 930     int f = 0;
 931
 932     if (data != NULL || digest != NULL) {
 933         if ((ctx = TS_VERIFY_CTX_new()) == NULL)
 934             goto err;
 935         f = TS_VFY_VERSION | TS_VFY_SIGNER;
 936         if (data != NULL) {
 937             f |= TS_VFY_DATA;
 938             if (TS_VERIFY_CTX_set_data(ctx, BIO_new_file(data, "rb")) == NULL)
 939                 goto err;
 940         } else if (digest != NULL) {
 941             long imprint_len;
 942             unsigned char *hexstr = string_to_hex(digest, &imprint_len);
 943             f |= TS_VFY_IMPRINT;
 944             if (TS_VERIFY_CTX_set_imprint(ctx, hexstr, imprint_len) == NULL) {
 945                 BIO_printf(bio_err, "invalid digest string\n");
 946                 goto err;
 947             }
 948         }
 949
 950     } else if (queryfile != NULL) {
 951         if ((input = BIO_new_file(queryfile, "rb")) == NULL)
 952             goto err;
 953         if ((request = d2i_TS_REQ_bio(input, NULL)) == NULL)
 954             goto err;
 955         if ((ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL)) == NULL)
 956             goto err;
 957     } else
 958         return NULL;
 959
 960     /* Add the signature verification flag and arguments. */
 961     TS_VERIFY_CTX_add_flags(ctx, f | TS_VFY_SIGNATURE);
 962
 963     /* Initialising the X509_STORE object. */
 964     if (TS_VERIFY_CTX_set_store(ctx, create_cert_store(CApath, CAfile, vpm))
 965             == NULL)
 966         goto err;
 967
 968     /* Loading untrusted certificates. */
 969     if (untrusted
 970         && TS_VERIFY_CTS_set_certs(ctx, TS_CONF_load_certs(untrusted)) == NULL)
 971         goto err;
 972     ret = 1;
 973
 974  err:
 975     if (!ret) {
 976         TS_VERIFY_CTX_free(ctx);
 977         ctx = NULL;
 978     }
 979     BIO_free_all(input);
 980     TS_REQ_free(request);
 981     return ctx;
 982 }
 983
 984 static X509_STORE *create_cert_store(char *CApath, char *CAfile, X509_VERIFY_PARAM *vpm)
 985 {
 986     X509_STORE *cert_ctx = NULL;
 987     X509_LOOKUP *lookup = NULL;
 988     int i;
 989
 990     cert_ctx = X509_STORE_new();
 991     X509_STORE_set_verify_cb(cert_ctx, verify_cb);
 992     if (CApath != NULL) {
 993         lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir());
 994         if (lookup == NULL) {
 995             BIO_printf(bio_err, "memory allocation failure\n");
 996             goto err;
 997         }
 998         i = X509_LOOKUP_add_dir(lookup, CApath, X509_FILETYPE_PEM);
 999         if (!i) {
1000             BIO_printf(bio_err, "Error loading directory %s\n", CApath);
1001             goto err;
1002         }
1003     }
1004
1005     if (CAfile != NULL) {
1006         lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
1007         if (lookup == NULL) {
1008             BIO_printf(bio_err, "memory allocation failure\n");
1009             goto err;
1010         }
1011         i = X509_LOOKUP_load_file(lookup, CAfile, X509_FILETYPE_PEM);
1012         if (!i) {
1013             BIO_printf(bio_err, "Error loading file %s\n", CAfile);
1014             goto err;
1015         }
1016     }
1017
1018     if (vpm != NULL)
1019         X509_STORE_set1_param(cert_ctx, vpm);
1020
1021     return cert_ctx;
1022
1023  err:
1024     X509_STORE_free(cert_ctx);
1025     return NULL;
1026 }
1027
1028 static int verify_cb(int ok, X509_STORE_CTX *ctx)
1029 {
1030     return ok;
1031 }
1032 #endif