apps/asn1pars.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include "apps.h"
  14 #include "progs.h"
  15 #include <openssl/err.h>
  16 #include <openssl/evp.h>
  17 #include <openssl/x509.h>
  18 #include <openssl/pem.h>
  19 #include <openssl/asn1t.h>
  20
  21 typedef enum OPTION_choice {
  22     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  23     OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT,
  24     OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT,
  25     OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM,
  26     OPT_ITEM
  27 } OPTION_CHOICE;
  28
  29 const OPTIONS asn1parse_options[] = {
  30     {"help", OPT_HELP, '-', "Display this summary"},
  31     {"inform", OPT_INFORM, 'F', "input format - one of DER PEM"},
  32     {"in", OPT_IN, '<', "input file"},
  33     {"out", OPT_OUT, '>', "output file (output format is always DER)"},
  34     {"i", OPT_INDENT, 0, "indents the output"},
  35     {"noout", OPT_NOOUT, 0, "do not produce any output"},
  36     {"offset", OPT_OFFSET, 'p', "offset into file"},
  37     {"length", OPT_LENGTH, 'p', "length of section in file"},
  38     {"oid", OPT_OID, '<', "file of extra oid definitions"},
  39     {"dump", OPT_DUMP, 0, "unknown data in hex form"},
  40     {"dlimit", OPT_DLIMIT, 'p',
  41      "dump the first arg bytes of unknown data in hex form"},
  42     {"strparse", OPT_STRPARSE, 's',
  43      "offset; a series of these can be used to 'dig'"},
  44     {OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"},
  45     {"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"},
  46     {"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"},
  47     {OPT_MORE_STR, 0, 0, "(-inform  will be ignored)"},
  48     {"strictpem", OPT_STRICTPEM, 0,
  49      "do not attempt base64 decode outside PEM markers"},
  50     {"item", OPT_ITEM, 's', "item to parse and print"},
  51     {NULL}
  52 };
  53
  54 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf);
  55
  56 int asn1parse_main(int argc, char **argv)
  57 {
  58     ASN1_TYPE *at = NULL;
  59     BIO *in = NULL, *b64 = NULL, *derout = NULL;
  60     BUF_MEM *buf = NULL;
  61     STACK_OF(OPENSSL_STRING) *osk = NULL;
  62     char *genstr = NULL, *genconf = NULL;
  63     char *infile = NULL, *oidfile = NULL, *derfile = NULL;
  64     unsigned char *str = NULL;
  65     char *name = NULL, *header = NULL, *prog;
  66     const unsigned char *ctmpbuf;
  67     int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM;
  68     int offset = 0, ret = 1, i, j;
  69     long num, tmplen;
  70     unsigned char *tmpbuf;
  71     unsigned int length = 0;
  72     OPTION_CHOICE o;
  73     const ASN1_ITEM *it = NULL;
  74
  75     prog = opt_init(argc, argv, asn1parse_options);
  76
  77     if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) {
  78         BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
  79         goto end;
  80     }
  81
  82     while ((o = opt_next()) != OPT_EOF) {
  83         switch (o) {
  84         case OPT_EOF:
  85         case OPT_ERR:
  86  opthelp:
  87             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  88             goto end;
  89         case OPT_HELP:
  90             opt_help(asn1parse_options);
  91             ret = 0;
  92             goto end;
  93         case OPT_INFORM:
  94             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
  95                 goto opthelp;
  96             break;
  97         case OPT_IN:
  98             infile = opt_arg();
  99             break;
 100         case OPT_OUT:
 101             derfile = opt_arg();
 102             break;
 103         case OPT_INDENT:
 104             indent = 1;
 105             break;
 106         case OPT_NOOUT:
 107             noout = 1;
 108             break;
 109         case OPT_OID:
 110             oidfile = opt_arg();
 111             break;
 112         case OPT_OFFSET:
 113             offset = strtol(opt_arg(), NULL, 0);
 114             break;
 115         case OPT_LENGTH:
 116             length = atoi(opt_arg());
 117             break;
 118         case OPT_DUMP:
 119             dump = -1;
 120             break;
 121         case OPT_DLIMIT:
 122             dump = atoi(opt_arg());
 123             break;
 124         case OPT_STRPARSE:
 125             sk_OPENSSL_STRING_push(osk, opt_arg());
 126             break;
 127         case OPT_GENSTR:
 128             genstr = opt_arg();
 129             break;
 130         case OPT_GENCONF:
 131             genconf = opt_arg();
 132             break;
 133         case OPT_STRICTPEM:
 134             strictpem = 1;
 135             informat = FORMAT_PEM;
 136             break;
 137         case OPT_ITEM:
 138             it = ASN1_ITEM_lookup(opt_arg());
 139             if (it == NULL) {
 140                 size_t tmp;
 141
 142                 BIO_printf(bio_err, "Unknown item name %s\n", opt_arg());
 143                 BIO_puts(bio_err, "Supported types:\n");
 144                 for (tmp = 0;; tmp++) {
 145                     it = ASN1_ITEM_get(tmp);
 146                     if (it == NULL)
 147                         break;
 148                     BIO_printf(bio_err, "    %s\n", it->sname);
 149                 }
 150                 goto end;
 151             }
 152             break;
 153         }
 154     }
 155     argc = opt_num_rest();
 156     if (argc != 0)
 157         goto opthelp;
 158
 159     if (oidfile != NULL) {
 160         in = bio_open_default(oidfile, 'r', FORMAT_TEXT);
 161         if (in == NULL)
 162             goto end;
 163         OBJ_create_objects(in);
 164         BIO_free(in);
 165     }
 166
 167     if ((in = bio_open_default(infile, 'r', informat)) == NULL)
 168         goto end;
 169
 170     if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL)
 171         goto end;
 172
 173     if (strictpem) {
 174         if (PEM_read_bio(in, &name, &header, &str, &num) !=
 175             1) {
 176             BIO_printf(bio_err, "Error reading PEM file\n");
 177             ERR_print_errors(bio_err);
 178             goto end;
 179         }
 180     } else {
 181
 182         if ((buf = BUF_MEM_new()) == NULL)
 183             goto end;
 184         if (!BUF_MEM_grow(buf, BUFSIZ * 8))
 185             goto end;           /* Pre-allocate :-) */
 186
 187         if (genstr || genconf) {
 188             num = do_generate(genstr, genconf, buf);
 189             if (num < 0) {
 190                 ERR_print_errors(bio_err);
 191                 goto end;
 192             }
 193         } else {
 194
 195             if (informat == FORMAT_PEM) {
 196                 BIO *tmp;
 197
 198                 if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 199                     goto end;
 200                 BIO_push(b64, in);
 201                 tmp = in;
 202                 in = b64;
 203                 b64 = tmp;
 204             }
 205
 206             num = 0;
 207             for (;;) {
 208                 if (!BUF_MEM_grow(buf, (int)num + BUFSIZ))
 209                     goto end;
 210                 i = BIO_read(in, &(buf->data[num]), BUFSIZ);
 211                 if (i <= 0)
 212                     break;
 213                 num += i;
 214             }
 215         }
 216         str = (unsigned char *)buf->data;
 217
 218     }
 219
 220     /* If any structs to parse go through in sequence */
 221
 222     if (sk_OPENSSL_STRING_num(osk)) {
 223         tmpbuf = str;
 224         tmplen = num;
 225         for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) {
 226             ASN1_TYPE *atmp;
 227             int typ;
 228             j = atoi(sk_OPENSSL_STRING_value(osk, i));
 229             if (j == 0) {
 230                 BIO_printf(bio_err, "'%s' is an invalid number\n",
 231                            sk_OPENSSL_STRING_value(osk, i));
 232                 continue;
 233             }
 234             tmpbuf += j;
 235             tmplen -= j;
 236             atmp = at;
 237             ctmpbuf = tmpbuf;
 238             at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
 239             ASN1_TYPE_free(atmp);
 240             if (!at) {
 241                 BIO_printf(bio_err, "Error parsing structure\n");
 242                 ERR_print_errors(bio_err);
 243                 goto end;
 244             }
 245             typ = ASN1_TYPE_get(at);
 246             if ((typ == V_ASN1_OBJECT)
 247                 || (typ == V_ASN1_BOOLEAN)
 248                 || (typ == V_ASN1_NULL)) {
 249                 BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ));
 250                 ERR_print_errors(bio_err);
 251                 goto end;
 252             }
 253             /* hmm... this is a little evil but it works */
 254             tmpbuf = at->value.asn1_string->data;
 255             tmplen = at->value.asn1_string->length;
 256         }
 257         str = tmpbuf;
 258         num = tmplen;
 259     }
 260
 261     if (offset >= num) {
 262         BIO_printf(bio_err, "Error: offset too large\n");
 263         goto end;
 264     }
 265
 266     num -= offset;
 267
 268     if ((length == 0) || ((long)length > num))
 269         length = (unsigned int)num;
 270     if (derout != NULL) {
 271         if (BIO_write(derout, str + offset, length) != (int)length) {
 272             BIO_printf(bio_err, "Error writing output\n");
 273             ERR_print_errors(bio_err);
 274             goto end;
 275         }
 276     }
 277     if (!noout) {
 278         const unsigned char *p = str + offset;
 279
 280         if (it != NULL) {
 281             ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it);
 282             if (value == NULL) {
 283                 BIO_printf(bio_err, "Error parsing item %s\n", it->sname);
 284                 ERR_print_errors(bio_err);
 285                 goto end;
 286             }
 287             ASN1_item_print(bio_out, value, 0, it, NULL);
 288             ASN1_item_free(value, it);
 289         } else {
 290             if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) {
 291                 ERR_print_errors(bio_err);
 292                 goto end;
 293             }
 294         }
 295     }
 296     ret = 0;
 297  end:
 298     BIO_free(derout);
 299     BIO_free(in);
 300     BIO_free(b64);
 301     if (ret != 0)
 302         ERR_print_errors(bio_err);
 303     BUF_MEM_free(buf);
 304     OPENSSL_free(name);
 305     OPENSSL_free(header);
 306     if (strictpem)
 307         OPENSSL_free(str);
 308     ASN1_TYPE_free(at);
 309     sk_OPENSSL_STRING_free(osk);
 310     return ret;
 311 }
 312
 313 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf)
 314 {
 315     CONF *cnf = NULL;
 316     int len;
 317     unsigned char *p;
 318     ASN1_TYPE *atyp = NULL;
 319
 320     if (genconf != NULL) {
 321         if ((cnf = app_load_config(genconf)) == NULL)
 322             goto err;
 323         if (genstr == NULL)
 324             genstr = NCONF_get_string(cnf, "default", "asn1");
 325         if (genstr == NULL) {
 326             BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf);
 327             goto err;
 328         }
 329     }
 330
 331     atyp = ASN1_generate_nconf(genstr, cnf);
 332     NCONF_free(cnf);
 333     cnf = NULL;
 334
 335     if (atyp == NULL)
 336         return -1;
 337
 338     len = i2d_ASN1_TYPE(atyp, NULL);
 339
 340     if (len <= 0)
 341         goto err;
 342
 343     if (!BUF_MEM_grow(buf, len))
 344         goto err;
 345
 346     p = (unsigned char *)buf->data;
 347
 348     i2d_ASN1_TYPE(atyp, &p);
 349
 350     ASN1_TYPE_free(atyp);
 351     return len;
 352
 353  err:
 354     NCONF_free(cnf);
 355     ASN1_TYPE_free(atyp);
 356     return -1;
 357 }