apps/asn1pars.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 DEFINE_STACK_OF(ASN1_OBJECT)
  22 DEFINE_STACK_OF_STRING()
  23
  24 typedef enum OPTION_choice {
  25     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  26     OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT,
  27     OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT,
  28     OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM,
  29     OPT_ITEM
  30 } OPTION_CHOICE;
  31
  32 const OPTIONS asn1parse_options[] = {
  33     OPT_SECTION("General"),
  34     {"help", OPT_HELP, '-', "Display this summary"},
  35     {"oid", OPT_OID, '<', "file of extra oid definitions"},
  36
  37     OPT_SECTION("I/O"),
  38     {"inform", OPT_INFORM, 'F', "input format - one of DER PEM"},
  39     {"in", OPT_IN, '<', "input file"},
  40     {"out", OPT_OUT, '>', "output file (output format is always DER)"},
  41     {"noout", OPT_NOOUT, 0, "do not produce any output"},
  42     {"offset", OPT_OFFSET, 'p', "offset into file"},
  43     {"length", OPT_LENGTH, 'p', "length of section in file"},
  44     {"strparse", OPT_STRPARSE, 'p',
  45      "offset; a series of these can be used to 'dig'"},
  46     {"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"},
  47     {OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"},
  48     {"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"},
  49     {"strictpem", OPT_STRICTPEM, 0,
  50      "do not attempt base64 decode outside PEM markers"},
  51     {"item", OPT_ITEM, 's', "item to parse and print"},
  52     {OPT_MORE_STR, 0, 0, "(-inform  will be ignored)"},
  53
  54     OPT_SECTION("Formatting"),
  55     {"i", OPT_INDENT, 0, "indents the output"},
  56     {"dump", OPT_DUMP, 0, "unknown data in hex form"},
  57     {"dlimit", OPT_DLIMIT, 'p',
  58      "dump the first arg bytes of unknown data in hex form"},
  59     {NULL}
  60 };
  61
  62 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf);
  63
  64 int asn1parse_main(int argc, char **argv)
  65 {
  66     ASN1_TYPE *at = NULL;
  67     BIO *in = NULL, *b64 = NULL, *derout = NULL;
  68     BUF_MEM *buf = NULL;
  69     STACK_OF(OPENSSL_STRING) *osk = NULL;
  70     char *genstr = NULL, *genconf = NULL;
  71     char *infile = NULL, *oidfile = NULL, *derfile = NULL;
  72     unsigned char *str = NULL;
  73     char *name = NULL, *header = NULL, *prog;
  74     const unsigned char *ctmpbuf;
  75     int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM;
  76     int offset = 0, ret = 1, i, j;
  77     long num, tmplen;
  78     unsigned char *tmpbuf;
  79     unsigned int length = 0;
  80     OPTION_CHOICE o;
  81     const ASN1_ITEM *it = NULL;
  82
  83     prog = opt_init(argc, argv, asn1parse_options);
  84
  85     if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) {
  86         BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
  87         goto end;
  88     }
  89
  90     while ((o = opt_next()) != OPT_EOF) {
  91         switch (o) {
  92         case OPT_EOF:
  93         case OPT_ERR:
  94  opthelp:
  95             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  96             goto end;
  97         case OPT_HELP:
  98             opt_help(asn1parse_options);
  99             ret = 0;
 100             goto end;
 101         case OPT_INFORM:
 102             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 103                 goto opthelp;
 104             break;
 105         case OPT_IN:
 106             infile = opt_arg();
 107             break;
 108         case OPT_OUT:
 109             derfile = opt_arg();
 110             break;
 111         case OPT_INDENT:
 112             indent = 1;
 113             break;
 114         case OPT_NOOUT:
 115             noout = 1;
 116             break;
 117         case OPT_OID:
 118             oidfile = opt_arg();
 119             break;
 120         case OPT_OFFSET:
 121             offset = strtol(opt_arg(), NULL, 0);
 122             break;
 123         case OPT_LENGTH:
 124             length = strtol(opt_arg(), NULL, 0);
 125             break;
 126         case OPT_DUMP:
 127             dump = -1;
 128             break;
 129         case OPT_DLIMIT:
 130             dump = strtol(opt_arg(), NULL, 0);
 131             break;
 132         case OPT_STRPARSE:
 133             sk_OPENSSL_STRING_push(osk, opt_arg());
 134             break;
 135         case OPT_GENSTR:
 136             genstr = opt_arg();
 137             break;
 138         case OPT_GENCONF:
 139             genconf = opt_arg();
 140             break;
 141         case OPT_STRICTPEM:
 142             strictpem = 1;
 143             informat = FORMAT_PEM;
 144             break;
 145         case OPT_ITEM:
 146             it = ASN1_ITEM_lookup(opt_arg());
 147             if (it == NULL) {
 148                 size_t tmp;
 149
 150                 BIO_printf(bio_err, "Unknown item name %s\n", opt_arg());
 151                 BIO_puts(bio_err, "Supported types:\n");
 152                 for (tmp = 0;; tmp++) {
 153                     it = ASN1_ITEM_get(tmp);
 154                     if (it == NULL)
 155                         break;
 156                     BIO_printf(bio_err, "    %s\n", it->sname);
 157                 }
 158                 goto end;
 159             }
 160             break;
 161         }
 162     }
 163     argc = opt_num_rest();
 164     if (argc != 0)
 165         goto opthelp;
 166
 167     if (oidfile != NULL) {
 168         in = bio_open_default(oidfile, 'r', FORMAT_TEXT);
 169         if (in == NULL)
 170             goto end;
 171         OBJ_create_objects(in);
 172         BIO_free(in);
 173     }
 174
 175     if ((in = bio_open_default(infile, 'r', informat)) == NULL)
 176         goto end;
 177
 178     if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL)
 179         goto end;
 180
 181     if ((buf = BUF_MEM_new()) == NULL)
 182         goto end;
 183     if (strictpem) {
 184         if (PEM_read_bio(in, &name, &header, &str, &num) != 1) {
 185             BIO_printf(bio_err, "Error reading PEM file\n");
 186             ERR_print_errors(bio_err);
 187             goto end;
 188         }
 189         buf->data = (char *)str;
 190         buf->length = buf->max = num;
 191     } else {
 192         if (!BUF_MEM_grow(buf, BUFSIZ * 8))
 193             goto end;           /* Pre-allocate :-) */
 194
 195         if (genstr || genconf) {
 196             num = do_generate(genstr, genconf, buf);
 197             if (num < 0) {
 198                 ERR_print_errors(bio_err);
 199                 goto end;
 200             }
 201         } else {
 202
 203             if (informat == FORMAT_PEM) {
 204                 BIO *tmp;
 205
 206                 if ((b64 = BIO_new(BIO_f_base64())) == NULL)
 207                     goto end;
 208                 BIO_push(b64, in);
 209                 tmp = in;
 210                 in = b64;
 211                 b64 = tmp;
 212             }
 213
 214             num = 0;
 215             for (;;) {
 216                 if (!BUF_MEM_grow(buf, num + BUFSIZ))
 217                     goto end;
 218                 i = BIO_read(in, &(buf->data[num]), BUFSIZ);
 219                 if (i <= 0)
 220                     break;
 221                 num += i;
 222             }
 223         }
 224         str = (unsigned char *)buf->data;
 225
 226     }
 227
 228     /* If any structs to parse go through in sequence */
 229
 230     if (sk_OPENSSL_STRING_num(osk)) {
 231         tmpbuf = str;
 232         tmplen = num;
 233         for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) {
 234             ASN1_TYPE *atmp;
 235             int typ;
 236             j = strtol(sk_OPENSSL_STRING_value(osk, i), NULL, 0);
 237             if (j <= 0 || j >= tmplen) {
 238                 BIO_printf(bio_err, "'%s' is out of range\n",
 239                            sk_OPENSSL_STRING_value(osk, i));
 240                 continue;
 241             }
 242             tmpbuf += j;
 243             tmplen -= j;
 244             atmp = at;
 245             ctmpbuf = tmpbuf;
 246             at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
 247             ASN1_TYPE_free(atmp);
 248             if (!at) {
 249                 BIO_printf(bio_err, "Error parsing structure\n");
 250                 ERR_print_errors(bio_err);
 251                 goto end;
 252             }
 253             typ = ASN1_TYPE_get(at);
 254             if ((typ == V_ASN1_OBJECT)
 255                 || (typ == V_ASN1_BOOLEAN)
 256                 || (typ == V_ASN1_NULL)) {
 257                 BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ));
 258                 ERR_print_errors(bio_err);
 259                 goto end;
 260             }
 261             /* hmm... this is a little evil but it works */
 262             tmpbuf = at->value.asn1_string->data;
 263             tmplen = at->value.asn1_string->length;
 264         }
 265         str = tmpbuf;
 266         num = tmplen;
 267     }
 268
 269     if (offset < 0 || offset >= num) {
 270         BIO_printf(bio_err, "Error: offset out of range\n");
 271         goto end;
 272     }
 273
 274     num -= offset;
 275
 276     if (length == 0 || length > (unsigned int)num)
 277         length = (unsigned int)num;
 278     if (derout != NULL) {
 279         if (BIO_write(derout, str + offset, length) != (int)length) {
 280             BIO_printf(bio_err, "Error writing output\n");
 281             ERR_print_errors(bio_err);
 282             goto end;
 283         }
 284     }
 285     if (!noout) {
 286         const unsigned char *p = str + offset;
 287
 288         if (it != NULL) {
 289             ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it);
 290             if (value == NULL) {
 291                 BIO_printf(bio_err, "Error parsing item %s\n", it->sname);
 292                 ERR_print_errors(bio_err);
 293                 goto end;
 294             }
 295             ASN1_item_print(bio_out, value, 0, it, NULL);
 296             ASN1_item_free(value, it);
 297         } else {
 298             if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) {
 299                 ERR_print_errors(bio_err);
 300                 goto end;
 301             }
 302         }
 303     }
 304     ret = 0;
 305  end:
 306     BIO_free(derout);
 307     BIO_free(in);
 308     BIO_free(b64);
 309     if (ret != 0)
 310         ERR_print_errors(bio_err);
 311     BUF_MEM_free(buf);
 312     OPENSSL_free(name);
 313     OPENSSL_free(header);
 314     ASN1_TYPE_free(at);
 315     sk_OPENSSL_STRING_free(osk);
 316     return ret;
 317 }
 318
 319 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf)
 320 {
 321     CONF *cnf = NULL;
 322     int len;
 323     unsigned char *p;
 324     ASN1_TYPE *atyp = NULL;
 325
 326     if (genconf != NULL) {
 327         if ((cnf = app_load_config(genconf)) == NULL)
 328             goto err;
 329         if (genstr == NULL)
 330             genstr = NCONF_get_string(cnf, "default", "asn1");
 331         if (genstr == NULL) {
 332             BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf);
 333             goto err;
 334         }
 335     }
 336
 337     atyp = ASN1_generate_nconf(genstr, cnf);
 338     NCONF_free(cnf);
 339     cnf = NULL;
 340
 341     if (atyp == NULL)
 342         return -1;
 343
 344     len = i2d_ASN1_TYPE(atyp, NULL);
 345
 346     if (len <= 0)
 347         goto err;
 348
 349     if (!BUF_MEM_grow(buf, len))
 350         goto err;
 351
 352     p = (unsigned char *)buf->data;
 353
 354     i2d_ASN1_TYPE(atyp, &p);
 355
 356     ASN1_TYPE_free(atyp);
 357     return len;
 358
 359  err:
 360     NCONF_free(cnf);
 361     ASN1_TYPE_free(atyp);
 362     return -1;
 363 }