apps/asn1pars.c

   1 /* apps/asn1pars.c */
   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 /*
  60  * A nice addition from Dr Stephen Henson <steve@openssl.org> to add the
  61  * -strparse option which parses nested binary structures
  62  */
  63
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include "apps.h"
  68 #include <openssl/err.h>
  69 #include <openssl/evp.h>
  70 #include <openssl/x509.h>
  71 #include <openssl/pem.h>
  72
  73 /*-
  74  * -inform arg  - input format - default PEM (DER or PEM)
  75  * -in arg      - input file - default stdin
  76  * -i           - indent the details by depth
  77  * -offset      - where in the file to start
  78  * -length      - how many bytes to use
  79  * -oid file    - extra oid description file
  80  */
  81
  82 #undef PROG
  83 #define PROG    asn1parse_main
  84
  85 int MAIN(int, char **);
  86
  87 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);
  88
  89 int MAIN(int argc, char **argv)
  90 {
  91     int i, badops = 0, offset = 0, ret = 1, j;
  92     unsigned int length = 0;
  93     long num, tmplen;
  94     BIO *in = NULL, *out = NULL, *b64 = NULL, *derout = NULL;
  95     int informat, indent = 0, noout = 0, dump = 0;
  96     char *infile = NULL, *str = NULL, *prog, *oidfile = NULL, *derfile = NULL;
  97     char *genstr = NULL, *genconf = NULL;
  98     unsigned char *tmpbuf;
  99     const unsigned char *ctmpbuf;
 100     BUF_MEM *buf = NULL;
 101     STACK *osk = NULL;
 102     ASN1_TYPE *at = NULL;
 103
 104     informat = FORMAT_PEM;
 105
 106     apps_startup();
 107
 108     if (bio_err == NULL)
 109         if ((bio_err = BIO_new(BIO_s_file())) != NULL)
 110             BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
 111
 112     if (!load_config(bio_err, NULL))
 113         goto end;
 114
 115     prog = argv[0];
 116     argc--;
 117     argv++;
 118     if ((osk = sk_new_null()) == NULL) {
 119         BIO_printf(bio_err, "Memory allocation failure\n");
 120         goto end;
 121     }
 122     while (argc >= 1) {
 123         if (strcmp(*argv, "-inform") == 0) {
 124             if (--argc < 1)
 125                 goto bad;
 126             informat = str2fmt(*(++argv));
 127         } else if (strcmp(*argv, "-in") == 0) {
 128             if (--argc < 1)
 129                 goto bad;
 130             infile = *(++argv);
 131         } else if (strcmp(*argv, "-out") == 0) {
 132             if (--argc < 1)
 133                 goto bad;
 134             derfile = *(++argv);
 135         } else if (strcmp(*argv, "-i") == 0) {
 136             indent = 1;
 137         } else if (strcmp(*argv, "-noout") == 0)
 138             noout = 1;
 139         else if (strcmp(*argv, "-oid") == 0) {
 140             if (--argc < 1)
 141                 goto bad;
 142             oidfile = *(++argv);
 143         } else if (strcmp(*argv, "-offset") == 0) {
 144             if (--argc < 1)
 145                 goto bad;
 146             offset = atoi(*(++argv));
 147         } else if (strcmp(*argv, "-length") == 0) {
 148             if (--argc < 1)
 149                 goto bad;
 150             length = atoi(*(++argv));
 151             if (length == 0)
 152                 goto bad;
 153         } else if (strcmp(*argv, "-dump") == 0) {
 154             dump = -1;
 155         } else if (strcmp(*argv, "-dlimit") == 0) {
 156             if (--argc < 1)
 157                 goto bad;
 158             dump = atoi(*(++argv));
 159             if (dump <= 0)
 160                 goto bad;
 161         } else if (strcmp(*argv, "-strparse") == 0) {
 162             if (--argc < 1)
 163                 goto bad;
 164             sk_push(osk, *(++argv));
 165         } else if (strcmp(*argv, "-genstr") == 0) {
 166             if (--argc < 1)
 167                 goto bad;
 168             genstr = *(++argv);
 169         } else if (strcmp(*argv, "-genconf") == 0) {
 170             if (--argc < 1)
 171                 goto bad;
 172             genconf = *(++argv);
 173         } else {
 174             BIO_printf(bio_err, "unknown option %s\n", *argv);
 175             badops = 1;
 176             break;
 177         }
 178         argc--;
 179         argv++;
 180     }
 181
 182     if (badops) {
 183  bad:
 184         BIO_printf(bio_err, "%s [options] <infile\n", prog);
 185         BIO_printf(bio_err, "where options are\n");
 186         BIO_printf(bio_err, " -inform arg   input format - one of DER PEM\n");
 187         BIO_printf(bio_err, " -in arg       input file\n");
 188         BIO_printf(bio_err,
 189                    " -out arg      output file (output format is always DER\n");
 190         BIO_printf(bio_err, " -noout arg    don't produce any output\n");
 191         BIO_printf(bio_err, " -offset arg   offset into file\n");
 192         BIO_printf(bio_err, " -length arg   length of section in file\n");
 193         BIO_printf(bio_err, " -i            indent entries\n");
 194         BIO_printf(bio_err, " -dump         dump unknown data in hex form\n");
 195         BIO_printf(bio_err,
 196                    " -dlimit arg   dump the first arg bytes of unknown data in hex form\n");
 197         BIO_printf(bio_err, " -oid file     file of extra oid definitions\n");
 198         BIO_printf(bio_err, " -strparse offset\n");
 199         BIO_printf(bio_err,
 200                    "               a series of these can be used to 'dig' into multiple\n");
 201         BIO_printf(bio_err, "               ASN1 blob wrappings\n");
 202         BIO_printf(bio_err,
 203                    " -genstr str   string to generate ASN1 structure from\n");
 204         BIO_printf(bio_err,
 205                    " -genconf file file to generate ASN1 structure from\n");
 206         goto end;
 207     }
 208
 209     ERR_load_crypto_strings();
 210
 211     in = BIO_new(BIO_s_file());
 212     out = BIO_new(BIO_s_file());
 213     if ((in == NULL) || (out == NULL)) {
 214         ERR_print_errors(bio_err);
 215         goto end;
 216     }
 217     BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
 218 #ifdef OPENSSL_SYS_VMS
 219     {
 220         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 221         out = BIO_push(tmpbio, out);
 222     }
 223 #endif
 224
 225     if (oidfile != NULL) {
 226         if (BIO_read_filename(in, oidfile) <= 0) {
 227             BIO_printf(bio_err, "problems opening %s\n", oidfile);
 228             ERR_print_errors(bio_err);
 229             goto end;
 230         }
 231         OBJ_create_objects(in);
 232     }
 233
 234     if (infile == NULL)
 235         BIO_set_fp(in, stdin, BIO_NOCLOSE);
 236     else {
 237         if (BIO_read_filename(in, infile) <= 0) {
 238             perror(infile);
 239             goto end;
 240         }
 241     }
 242
 243     if (derfile) {
 244         if (!(derout = BIO_new_file(derfile, "wb"))) {
 245             BIO_printf(bio_err, "problems opening %s\n", derfile);
 246             ERR_print_errors(bio_err);
 247             goto end;
 248         }
 249     }
 250
 251     if ((buf = BUF_MEM_new()) == NULL)
 252         goto end;
 253     if (!BUF_MEM_grow(buf, BUFSIZ * 8))
 254         goto end;               /* Pre-allocate :-) */
 255
 256     if (genstr || genconf) {
 257         num = do_generate(bio_err, genstr, genconf, buf);
 258         if (num < 0) {
 259             ERR_print_errors(bio_err);
 260             goto end;
 261         }
 262     }
 263
 264     else {
 265
 266         if (informat == FORMAT_PEM) {
 267             BIO *tmp;
 268
 269             if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 270                 goto end;
 271             BIO_push(b64, in);
 272             tmp = in;
 273             in = b64;
 274             b64 = tmp;
 275         }
 276
 277         num = 0;
 278         for (;;) {
 279             if (!BUF_MEM_grow(buf, (int)num + BUFSIZ))
 280                 goto end;
 281             i = BIO_read(in, &(buf->data[num]), BUFSIZ);
 282             if (i <= 0)
 283                 break;
 284             num += i;
 285         }
 286     }
 287     str = buf->data;
 288
 289     /* If any structs to parse go through in sequence */
 290
 291     if (sk_num(osk)) {
 292         tmpbuf = (unsigned char *)str;
 293         tmplen = num;
 294         for (i = 0; i < sk_num(osk); i++) {
 295             ASN1_TYPE *atmp;
 296             int typ;
 297             j = atoi(sk_value(osk, i));
 298             if (j == 0) {
 299                 BIO_printf(bio_err, "'%s' is an invalid number\n",
 300                            sk_value(osk, i));
 301                 continue;
 302             }
 303             tmpbuf += j;
 304             tmplen -= j;
 305             atmp = at;
 306             ctmpbuf = tmpbuf;
 307             at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
 308             ASN1_TYPE_free(atmp);
 309             if (!at) {
 310                 BIO_printf(bio_err, "Error parsing structure\n");
 311                 ERR_print_errors(bio_err);
 312                 goto end;
 313             }
 314             typ = ASN1_TYPE_get(at);
 315             if ((typ == V_ASN1_OBJECT)
 316                 || (typ == V_ASN1_BOOLEAN)
 317                 || (typ == V_ASN1_NULL)) {
 318                 BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ));
 319                 ERR_print_errors(bio_err);
 320                 goto end;
 321             }
 322             /* hmm... this is a little evil but it works */
 323             tmpbuf = at->value.asn1_string->data;
 324             tmplen = at->value.asn1_string->length;
 325         }
 326         str = (char *)tmpbuf;
 327         num = tmplen;
 328     }
 329
 330     if (offset >= num) {
 331         BIO_printf(bio_err, "Error: offset too large\n");
 332         goto end;
 333     }
 334
 335     num -= offset;
 336
 337     if ((length == 0) || ((long)length > num))
 338         length = (unsigned int)num;
 339     if (derout) {
 340         if (BIO_write(derout, str + offset, length) != (int)length) {
 341             BIO_printf(bio_err, "Error writing output\n");
 342             ERR_print_errors(bio_err);
 343             goto end;
 344         }
 345     }
 346     if (!noout &&
 347         !ASN1_parse_dump(out, (unsigned char *)&(str[offset]), length,
 348                          indent, dump)) {
 349         ERR_print_errors(bio_err);
 350         goto end;
 351     }
 352     ret = 0;
 353  end:
 354     BIO_free(derout);
 355     if (in != NULL)
 356         BIO_free(in);
 357     if (out != NULL)
 358         BIO_free_all(out);
 359     if (b64 != NULL)
 360         BIO_free(b64);
 361     if (ret != 0)
 362         ERR_print_errors(bio_err);
 363     if (buf != NULL)
 364         BUF_MEM_free(buf);
 365     if (at != NULL)
 366         ASN1_TYPE_free(at);
 367     if (osk != NULL)
 368         sk_free(osk);
 369     OBJ_cleanup();
 370     apps_shutdown();
 371     OPENSSL_EXIT(ret);
 372 }
 373
 374 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)
 375 {
 376     CONF *cnf = NULL;
 377     int len;
 378     long errline;
 379     unsigned char *p;
 380     ASN1_TYPE *atyp = NULL;
 381
 382     if (genconf) {
 383         cnf = NCONF_new(NULL);
 384         if (!NCONF_load(cnf, genconf, &errline))
 385             goto conferr;
 386         if (!genstr)
 387             genstr = NCONF_get_string(cnf, "default", "asn1");
 388         if (!genstr) {
 389             BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
 390             goto err;
 391         }
 392     }
 393
 394     atyp = ASN1_generate_nconf(genstr, cnf);
 395     NCONF_free(cnf);
 396     cnf = NULL;
 397
 398     if (!atyp)
 399         return -1;
 400
 401     len = i2d_ASN1_TYPE(atyp, NULL);
 402
 403     if (len <= 0)
 404         goto err;
 405
 406     if (!BUF_MEM_grow(buf, len))
 407         goto err;
 408
 409     p = (unsigned char *)buf->data;
 410
 411     i2d_ASN1_TYPE(atyp, &p);
 412
 413     ASN1_TYPE_free(atyp);
 414     return len;
 415
 416  conferr:
 417
 418     if (errline > 0)
 419         BIO_printf(bio, "Error on line %ld of config file '%s'\n",
 420                    errline, genconf);
 421     else
 422         BIO_printf(bio, "Error loading config file '%s'\n", genconf);
 423
 424  err:
 425     NCONF_free(cnf);
 426     ASN1_TYPE_free(atyp);
 427
 428     return -1;
 429
 430 }