bin/openssl/asn1pars.c

   1 /* $OpenBSD: asn1pars.c,v 1.7 2017/01/20 08:57:11 deraadt Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 /* A nice addition from Dr Stephen Henson <steve@openssl.org> to
  60  * add the -strparse option which parses nested binary structures
  61  */
  62
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <limits.h>
  66 #include <string.h>
  67
  68 #include "apps.h"
  69 #include "progs.h"
  70
  71 #include <openssl/err.h>
  72 #include <openssl/evp.h>
  73 #include <openssl/pem.h>
  74 #include <openssl/x509.h>
  75
  76 static struct {
  77         char *derfile;
  78         int dump;
  79         char *genconf;
  80         char *genstr;
  81         int indent;
  82         char *infile;
  83         int informat;
  84         unsigned int length;
  85         int noout;
  86         int offset;
  87         char *oidfile;
  88         STACK_OF(OPENSSL_STRING) *osk;
  89 } asn1pars_config;
  90
  91 static int
  92 asn1pars_opt_dlimit(char *arg)
  93 {
  94         const char *errstr;
  95
  96         asn1pars_config.dump = strtonum(arg, 1, INT_MAX, &errstr);
  97         if (errstr) {
  98                 fprintf(stderr, "-dlimit must be from 1 to INT_MAX: %s\n",
  99                     errstr);
 100                 return (-1);
 101         }
 102         return (0);
 103 }
 104
 105 static int
 106 asn1pars_opt_length(char *arg)
 107 {
 108         const char *errstr;
 109
 110         asn1pars_config.length = strtonum(arg, 1, UINT_MAX, &errstr);
 111         if (errstr) {
 112                 fprintf(stderr, "-length must be from 1 to UINT_MAX: %s\n",
 113                     errstr);
 114                 return (-1);
 115         }
 116         return (0);
 117 }
 118
 119 static int
 120 asn1pars_opt_strparse(char *arg)
 121 {
 122         if (sk_OPENSSL_STRING_push(asn1pars_config.osk, arg) == 0) {
 123                 fprintf(stderr, "-strparse cannot add argument\n");
 124                 return (-1);
 125         }
 126         return (0);
 127 }
 128
 129 static struct option asn1pars_options[] = {
 130         {
 131                 .name = "dump",
 132                 .desc = "Dump unknown data in hex form",
 133                 .type = OPTION_VALUE,
 134                 .value = -1,
 135                 .opt.value = &asn1pars_config.dump,
 136         },
 137         {
 138                 .name = "dlimit",
 139                 .argname = "num",
 140                 .desc = "Dump the first num bytes of unknown data in hex form",
 141                 .type = OPTION_ARG_FUNC,
 142                 .opt.argfunc = asn1pars_opt_dlimit,
 143         },
 144         {
 145                 .name = "genconf",
 146                 .argname = "file",
 147                 .desc = "File to generate ASN.1 structure from",
 148                 .type = OPTION_ARG,
 149                 .opt.arg = &asn1pars_config.genconf,
 150         },
 151         {
 152                 .name = "genstr",
 153                 .argname = "string",
 154                 .desc = "String to generate ASN.1 structure from",
 155                 .type = OPTION_ARG,
 156                 .opt.arg = &asn1pars_config.genstr,
 157         },
 158         {
 159                 .name = "i",
 160                 .desc = "Indent output according to depth of structures",
 161                 .type = OPTION_FLAG,
 162                 .opt.flag = &asn1pars_config.indent,
 163         },
 164         {
 165                 .name = "in",
 166                 .argname = "file",
 167                 .desc = "The input file (default stdin)",
 168                 .type = OPTION_ARG,
 169                 .opt.arg = &asn1pars_config.infile,
 170         },
 171         {
 172                 .name = "inform",
 173                 .argname = "fmt",
 174                 .desc = "Input format (DER, TXT or PEM (default))",
 175                 .type = OPTION_ARG_FORMAT,
 176                 .opt.value = &asn1pars_config.informat,
 177         },
 178         {
 179                 .name = "length",
 180                 .argname = "num",
 181                 .desc = "Number of bytes to parse (default until EOF)",
 182                 .type = OPTION_ARG_FUNC,
 183                 .opt.argfunc = asn1pars_opt_length,
 184         },
 185         {
 186                 .name = "noout",
 187                 .desc = "Do not produce any output",
 188                 .type = OPTION_FLAG,
 189                 .opt.flag = &asn1pars_config.noout,
 190         },
 191         {
 192                 .name = "offset",
 193                 .argname = "num",
 194                 .desc = "Offset to begin parsing",
 195                 .type = OPTION_ARG_INT,
 196                 .opt.value = &asn1pars_config.offset,
 197         },
 198         {
 199                 .name = "oid",
 200                 .argname = "file",
 201                 .desc = "File containing additional object identifiers (OIDs)",
 202                 .type = OPTION_ARG,
 203                 .opt.arg = &asn1pars_config.oidfile,
 204         },
 205         {
 206                 .name = "out",
 207                 .argname = "file",
 208                 .desc = "Output file in DER format",
 209                 .type = OPTION_ARG,
 210                 .opt.arg = &asn1pars_config.derfile,
 211         },
 212         {
 213                 .name = "strparse",
 214                 .argname = "offset",
 215                 .desc = "Parse the content octets of ASN.1 object starting at"
 216                 " offset",
 217                 .type = OPTION_ARG_FUNC,
 218                 .opt.argfunc = asn1pars_opt_strparse,
 219         },
 220         { NULL },
 221 };
 222
 223 static void
 224 asn1pars_usage()
 225 {
 226         fprintf(stderr,
 227             "usage: asn1parse [-i] [-dlimit num] [-dump] [-genconf file] "
 228             "[-genstr string]\n"
 229             "    [-in file] [-inform fmt] [-length num] [-noout] [-offset num] "
 230             "[-oid file]\n"
 231             "    [-out file] [-strparse offset]\n\n");
 232         options_usage(asn1pars_options);
 233 }
 234
 235 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);
 236
 237 int
 238 asn1parse_main(int argc, char **argv)
 239 {
 240         int i, j, ret = 1;
 241         long num, tmplen;
 242         BIO *in = NULL, *out = NULL, *b64 = NULL, *derout = NULL;
 243         char *str = NULL;
 244         const char *errstr = NULL;
 245         unsigned char *tmpbuf;
 246         const unsigned char *ctmpbuf;
 247         BUF_MEM *buf = NULL;
 248         ASN1_TYPE *at = NULL;
 249
 250         if (single_execution) {
 251                 if (pledge("stdio cpath wpath rpath", NULL) == -1) {
 252                         perror("pledge");
 253                         exit(1);
 254                 }
 255         }
 256
 257         memset(&asn1pars_config, 0, sizeof(asn1pars_config));
 258
 259         asn1pars_config.informat = FORMAT_PEM;
 260         if ((asn1pars_config.osk = sk_OPENSSL_STRING_new_null()) == NULL) {
 261                 BIO_printf(bio_err, "Memory allocation failure\n");
 262                 goto end;
 263         }
 264
 265         if (options_parse(argc, argv, asn1pars_options, NULL, NULL) != 0) {
 266                 asn1pars_usage();
 267                 return (1);
 268         }
 269
 270         in = BIO_new(BIO_s_file());
 271         out = BIO_new(BIO_s_file());
 272         if ((in == NULL) || (out == NULL)) {
 273                 ERR_print_errors(bio_err);
 274                 goto end;
 275         }
 276         BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
 277
 278         if (asn1pars_config.oidfile != NULL) {
 279                 if (BIO_read_filename(in, asn1pars_config.oidfile) <= 0) {
 280                         BIO_printf(bio_err, "problems opening %s\n",
 281                             asn1pars_config.oidfile);
 282                         ERR_print_errors(bio_err);
 283                         goto end;
 284                 }
 285                 OBJ_create_objects(in);
 286         }
 287         if (asn1pars_config.infile == NULL)
 288                 BIO_set_fp(in, stdin, BIO_NOCLOSE);
 289         else {
 290                 if (BIO_read_filename(in, asn1pars_config.infile) <= 0) {
 291                         perror(asn1pars_config.infile);
 292                         goto end;
 293                 }
 294         }
 295
 296         if (asn1pars_config.derfile) {
 297                 if (!(derout = BIO_new_file(asn1pars_config.derfile, "wb"))) {
 298                         BIO_printf(bio_err, "problems opening %s\n",
 299                             asn1pars_config.derfile);
 300                         ERR_print_errors(bio_err);
 301                         goto end;
 302                 }
 303         }
 304         if ((buf = BUF_MEM_new()) == NULL)
 305                 goto end;
 306         if (!BUF_MEM_grow(buf, BUFSIZ * 8))
 307                 goto end;       /* Pre-allocate :-) */
 308
 309         if (asn1pars_config.genstr || asn1pars_config.genconf) {
 310                 num = do_generate(bio_err, asn1pars_config.genstr,
 311                     asn1pars_config.genconf, buf);
 312                 if (num < 0) {
 313                         ERR_print_errors(bio_err);
 314                         goto end;
 315                 }
 316         } else {
 317
 318                 if (asn1pars_config.informat == FORMAT_PEM) {
 319                         BIO *tmp;
 320
 321                         if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 322                                 goto end;
 323                         BIO_push(b64, in);
 324                         tmp = in;
 325                         in = b64;
 326                         b64 = tmp;
 327                 }
 328                 num = 0;
 329                 for (;;) {
 330                         if (!BUF_MEM_grow(buf, (int) num + BUFSIZ))
 331                                 goto end;
 332                         i = BIO_read(in, &(buf->data[num]), BUFSIZ);
 333                         if (i <= 0)
 334                                 break;
 335                         num += i;
 336                 }
 337         }
 338         str = buf->data;
 339
 340         /* If any structs to parse go through in sequence */
 341
 342         if (sk_OPENSSL_STRING_num(asn1pars_config.osk)) {
 343                 tmpbuf = (unsigned char *) str;
 344                 tmplen = num;
 345                 for (i = 0; i < sk_OPENSSL_STRING_num(asn1pars_config.osk);
 346                      i++) {
 347                         ASN1_TYPE *atmp;
 348                         int typ;
 349                         j = strtonum(
 350                             sk_OPENSSL_STRING_value(asn1pars_config.osk, i),
 351                             1, INT_MAX, &errstr);
 352                         if (errstr) {
 353                                 BIO_printf(bio_err,
 354                                     "'%s' is an invalid number: %s\n",
 355                                     sk_OPENSSL_STRING_value(asn1pars_config.osk,
 356                                     i), errstr);
 357                                 continue;
 358                         }
 359                         tmpbuf += j;
 360                         tmplen -= j;
 361                         atmp = at;
 362                         ctmpbuf = tmpbuf;
 363                         at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
 364                         ASN1_TYPE_free(atmp);
 365                         if (!at) {
 366                                 BIO_printf(bio_err, "Error parsing structure\n");
 367                                 ERR_print_errors(bio_err);
 368                                 goto end;
 369                         }
 370                         typ = ASN1_TYPE_get(at);
 371                         if ((typ == V_ASN1_OBJECT) ||
 372                             (typ == V_ASN1_NULL)) {
 373                                 BIO_printf(bio_err, "Can't parse %s type\n",
 374                                     typ == V_ASN1_NULL ? "NULL" : "OBJECT");
 375                                 ERR_print_errors(bio_err);
 376                                 goto end;
 377                         }
 378                         /* hmm... this is a little evil but it works */
 379                         tmpbuf = at->value.asn1_string->data;
 380                         tmplen = at->value.asn1_string->length;
 381                 }
 382                 str = (char *) tmpbuf;
 383                 num = tmplen;
 384         }
 385         if (asn1pars_config.offset >= num) {
 386                 BIO_printf(bio_err, "Error: offset too large\n");
 387                 goto end;
 388         }
 389         num -= asn1pars_config.offset;
 390
 391         if ((asn1pars_config.length == 0) ||
 392             ((long)asn1pars_config.length > num))
 393                 asn1pars_config.length = (unsigned int) num;
 394         if (derout) {
 395                 if (BIO_write(derout, str + asn1pars_config.offset,
 396                     asn1pars_config.length) != (int)asn1pars_config.length) {
 397                         BIO_printf(bio_err, "Error writing output\n");
 398                         ERR_print_errors(bio_err);
 399                         goto end;
 400                 }
 401         }
 402         if (!asn1pars_config.noout &&
 403             !ASN1_parse_dump(out,
 404             (unsigned char *)&(str[asn1pars_config.offset]),
 405             asn1pars_config.length, asn1pars_config.indent,
 406             asn1pars_config.dump)) {
 407                 ERR_print_errors(bio_err);
 408                 goto end;
 409         }
 410         ret = 0;
 411 end:
 412         BIO_free(derout);
 413         BIO_free(in);
 414         BIO_free_all(out);
 415         BIO_free(b64);
 416         if (ret != 0)
 417                 ERR_print_errors(bio_err);
 418         BUF_MEM_free(buf);
 419         if (at != NULL)
 420                 ASN1_TYPE_free(at);
 421         sk_OPENSSL_STRING_free(asn1pars_config.osk);
 422         OBJ_cleanup();
 423
 424         return (ret);
 425 }
 426
 427 static int
 428 do_generate(BIO * bio, char *genstr, char *genconf, BUF_MEM * buf)
 429 {
 430         CONF *cnf = NULL;
 431         int len;
 432         long errline;
 433         unsigned char *p;
 434         ASN1_TYPE *atyp = NULL;
 435
 436         if (genconf) {
 437                 cnf = NCONF_new(NULL);
 438                 if (!NCONF_load(cnf, genconf, &errline))
 439                         goto conferr;
 440                 if (!genstr)
 441                         genstr = NCONF_get_string(cnf, "default", "asn1");
 442                 if (!genstr) {
 443                         BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
 444                         goto err;
 445                 }
 446         }
 447         atyp = ASN1_generate_nconf(genstr, cnf);
 448         NCONF_free(cnf);
 449         cnf = NULL;
 450
 451         if (!atyp)
 452                 return -1;
 453
 454         len = i2d_ASN1_TYPE(atyp, NULL);
 455         if (len <= 0)
 456                 goto err;
 457
 458         if (!BUF_MEM_grow(buf, len))
 459                 goto err;
 460
 461         p = (unsigned char *) buf->data;
 462
 463         i2d_ASN1_TYPE(atyp, &p);
 464
 465         ASN1_TYPE_free(atyp);
 466         return len;
 467
 468 conferr:
 469
 470         if (errline > 0)
 471                 BIO_printf(bio, "Error on line %ld of config file '%s'\n",
 472                     errline, genconf);
 473         else
 474                 BIO_printf(bio, "Error loading config file '%s'\n", genconf);
 475
 476 err:
 477         NCONF_free(cnf);
 478         ASN1_TYPE_free(atyp);
 479
 480         return -1;
 481
 482 }