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 /* A nice addition from Dr Stephen Henson <shenson@bigfoot.com> to
  60  * add the -strparse option which parses nested binary structures
  61  */
  62
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include "apps.h"
  67 #include <openssl/err.h>
  68 #include <openssl/evp.h>
  69 #include <openssl/x509.h>
  70 #include <openssl/pem.h>
  71
  72 /* -inform arg  - input format - default PEM (DER or PEM)
  73  * -in arg      - input file - default stdin
  74  * -i           - indent the details by depth
  75  * -offset      - where in the file to start
  76  * -length      - how many bytes to use
  77  * -oid file    - extra oid description file
  78  */
  79
  80 #undef PROG
  81 #define PROG    asn1parse_main
  82
  83 int MAIN(int, char **);
  84
  85 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);
  86
  87 int MAIN(int argc, char **argv)
  88         {
  89         int i,badops=0,offset=0,ret=1,j;
  90         unsigned int length=0;
  91         long num,tmplen;
  92         BIO *in=NULL,*out=NULL,*b64=NULL, *derout = NULL;
  93         int informat,indent=0, noout = 0, dump = 0;
  94         char *infile=NULL,*str=NULL,*prog,*oidfile=NULL, *derfile=NULL;
  95         char *genstr=NULL, *genconf=NULL;
  96         unsigned char *tmpbuf;
  97         BUF_MEM *buf=NULL;
  98         STACK *osk=NULL;
  99         ASN1_TYPE *at=NULL;
 100
 101         informat=FORMAT_PEM;
 102
 103         apps_startup();
 104
 105         if (bio_err == NULL)
 106                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 107                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
 108
 109         if (!load_config(bio_err, NULL))
 110                 goto end;
 111
 112         prog=argv[0];
 113         argc--;
 114         argv++;
 115         if ((osk=sk_new_null()) == NULL)
 116                 {
 117                 BIO_printf(bio_err,"Memory allocation failure\n");
 118                 goto end;
 119                 }
 120         while (argc >= 1)
 121                 {
 122                 if      (strcmp(*argv,"-inform") == 0)
 123                         {
 124                         if (--argc < 1) goto bad;
 125                         informat=str2fmt(*(++argv));
 126                         }
 127                 else if (strcmp(*argv,"-in") == 0)
 128                         {
 129                         if (--argc < 1) goto bad;
 130                         infile= *(++argv);
 131                         }
 132                 else if (strcmp(*argv,"-out") == 0)
 133                         {
 134                         if (--argc < 1) goto bad;
 135                         derfile= *(++argv);
 136                         }
 137                 else if (strcmp(*argv,"-i") == 0)
 138                         {
 139                         indent=1;
 140                         }
 141                 else if (strcmp(*argv,"-noout") == 0) noout = 1;
 142                 else if (strcmp(*argv,"-oid") == 0)
 143                         {
 144                         if (--argc < 1) goto bad;
 145                         oidfile= *(++argv);
 146                         }
 147                 else if (strcmp(*argv,"-offset") == 0)
 148                         {
 149                         if (--argc < 1) goto bad;
 150                         offset= atoi(*(++argv));
 151                         }
 152                 else if (strcmp(*argv,"-length") == 0)
 153                         {
 154                         if (--argc < 1) goto bad;
 155                         length= atoi(*(++argv));
 156                         if (length == 0) goto bad;
 157                         }
 158                 else if (strcmp(*argv,"-dump") == 0)
 159                         {
 160                         dump= -1;
 161                         }
 162                 else if (strcmp(*argv,"-dlimit") == 0)
 163                         {
 164                         if (--argc < 1) goto bad;
 165                         dump= atoi(*(++argv));
 166                         if (dump <= 0) goto bad;
 167                         }
 168                 else if (strcmp(*argv,"-strparse") == 0)
 169                         {
 170                         if (--argc < 1) goto bad;
 171                         sk_push(osk,*(++argv));
 172                         }
 173                 else if (strcmp(*argv,"-genstr") == 0)
 174                         {
 175                         if (--argc < 1) goto bad;
 176                         genstr= *(++argv);
 177                         }
 178                 else if (strcmp(*argv,"-genconf") == 0)
 179                         {
 180                         if (--argc < 1) goto bad;
 181                         genconf= *(++argv);
 182                         }
 183                 else
 184                         {
 185                         BIO_printf(bio_err,"unknown option %s\n",*argv);
 186                         badops=1;
 187                         break;
 188                         }
 189                 argc--;
 190                 argv++;
 191                 }
 192
 193         if (badops)
 194                 {
 195 bad:
 196                 BIO_printf(bio_err,"%s [options] <infile\n",prog);
 197                 BIO_printf(bio_err,"where options are\n");
 198                 BIO_printf(bio_err," -inform arg   input format - one of DER TXT PEM\n");
 199                 BIO_printf(bio_err," -in arg       input file\n");
 200                 BIO_printf(bio_err," -out arg      output file (output format is always DER\n");
 201                 BIO_printf(bio_err," -noout arg    don't produce any output\n");
 202                 BIO_printf(bio_err," -offset arg   offset into file\n");
 203                 BIO_printf(bio_err," -length arg   length of section in file\n");
 204                 BIO_printf(bio_err," -i            indent entries\n");
 205                 BIO_printf(bio_err," -dump         dump unknown data in hex form\n");
 206                 BIO_printf(bio_err," -dlimit arg   dump the first arg bytes of unknown data in hex form\n");
 207                 BIO_printf(bio_err," -oid file     file of extra oid definitions\n");
 208                 BIO_printf(bio_err," -strparse offset\n");
 209                 BIO_printf(bio_err,"               a series of these can be used to 'dig' into multiple\n");
 210                 BIO_printf(bio_err,"               ASN1 blob wrappings\n");
 211                 BIO_printf(bio_err," -genstr str   string to generate ASN1 structure from\n");
 212                 BIO_printf(bio_err," -genconf file file to generate ASN1 structure from\n");
 213                 goto end;
 214                 }
 215
 216         ERR_load_crypto_strings();
 217
 218         in=BIO_new(BIO_s_file());
 219         out=BIO_new(BIO_s_file());
 220         if ((in == NULL) || (out == NULL))
 221                 {
 222                 ERR_print_errors(bio_err);
 223                 goto end;
 224                 }
 225         BIO_set_fp(out,stdout,BIO_NOCLOSE|BIO_FP_TEXT);
 226 #ifdef OPENSSL_SYS_VMS
 227         {
 228         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 229         out = BIO_push(tmpbio, out);
 230         }
 231 #endif
 232
 233         if (oidfile != NULL)
 234                 {
 235                 if (BIO_read_filename(in,oidfile) <= 0)
 236                         {
 237                         BIO_printf(bio_err,"problems opening %s\n",oidfile);
 238                         ERR_print_errors(bio_err);
 239                         goto end;
 240                         }
 241                 OBJ_create_objects(in);
 242                 }
 243
 244         if (infile == NULL)
 245                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
 246         else
 247                 {
 248                 if (BIO_read_filename(in,infile) <= 0)
 249                         {
 250                         perror(infile);
 251                         goto end;
 252                         }
 253                 }
 254
 255         if (derfile) {
 256                 if(!(derout = BIO_new_file(derfile, "wb"))) {
 257                         BIO_printf(bio_err,"problems opening %s\n",derfile);
 258                         ERR_print_errors(bio_err);
 259                         goto end;
 260                 }
 261         }
 262
 263         if ((buf=BUF_MEM_new()) == NULL) goto end;
 264         if (!BUF_MEM_grow(buf,BUFSIZ*8)) goto end; /* Pre-allocate :-) */
 265
 266         if (genstr || genconf)
 267                 {
 268                 num = do_generate(bio_err, genstr, genconf, buf);
 269                 if (num < 0)
 270                         {
 271                         ERR_print_errors(bio_err);
 272                         goto end;
 273                         }
 274                 }
 275
 276         else
 277                 {
 278
 279                 if (informat == FORMAT_PEM)
 280                         {
 281                         BIO *tmp;
 282
 283                         if ((b64=BIO_new(BIO_f_base64())) == NULL)
 284                                 goto end;
 285                         BIO_push(b64,in);
 286                         tmp=in;
 287                         in=b64;
 288                         b64=tmp;
 289                         }
 290
 291                 num=0;
 292                 for (;;)
 293                         {
 294                         if (!BUF_MEM_grow(buf,(int)num+BUFSIZ)) goto end;
 295                         i=BIO_read(in,&(buf->data[num]),BUFSIZ);
 296                         if (i <= 0) break;
 297                         num+=i;
 298                         }
 299                 }
 300         str=buf->data;
 301
 302         /* If any structs to parse go through in sequence */
 303
 304         if (sk_num(osk))
 305                 {
 306                 tmpbuf=(unsigned char *)str;
 307                 tmplen=num;
 308                 for (i=0; i<sk_num(osk); i++)
 309                         {
 310                         ASN1_TYPE *atmp;
 311                         j=atoi(sk_value(osk,i));
 312                         if (j == 0)
 313                                 {
 314                                 BIO_printf(bio_err,"'%s' is an invalid number\n",sk_value(osk,i));
 315                                 continue;
 316                                 }
 317                         tmpbuf+=j;
 318                         tmplen-=j;
 319                         atmp = at;
 320                         at = d2i_ASN1_TYPE(NULL,&tmpbuf,tmplen);
 321                         ASN1_TYPE_free(atmp);
 322                         if(!at)
 323                                 {
 324                                 BIO_printf(bio_err,"Error parsing structure\n");
 325                                 ERR_print_errors(bio_err);
 326                                 goto end;
 327                                 }
 328                         /* hmm... this is a little evil but it works */
 329                         tmpbuf=at->value.asn1_string->data;
 330                         tmplen=at->value.asn1_string->length;
 331                         }
 332                 str=(char *)tmpbuf;
 333                 num=tmplen;
 334                 }
 335
 336         if (offset >= num)
 337                 {
 338                 BIO_printf(bio_err, "Error: offset too large\n");
 339                 goto end;
 340                 }
 341
 342         num -= offset;
 343
 344         if ((length == 0) || ((long)length > num)) length=(unsigned int)num;
 345         if(derout) {
 346                 if(BIO_write(derout, str + offset, length) != (int)length) {
 347                         BIO_printf(bio_err, "Error writing output\n");
 348                         ERR_print_errors(bio_err);
 349                         goto end;
 350                 }
 351         }
 352         if (!noout &&
 353             !ASN1_parse_dump(out,(unsigned char *)&(str[offset]),length,
 354                     indent,dump))
 355                 {
 356                 ERR_print_errors(bio_err);
 357                 goto end;
 358                 }
 359         ret=0;
 360 end:
 361         BIO_free(derout);
 362         if (in != NULL) BIO_free(in);
 363         if (out != NULL) BIO_free_all(out);
 364         if (b64 != NULL) BIO_free(b64);
 365         if (ret != 0)
 366                 ERR_print_errors(bio_err);
 367         if (buf != NULL) BUF_MEM_free(buf);
 368         if (at != NULL) ASN1_TYPE_free(at);
 369         if (osk != NULL) sk_free(osk);
 370         OBJ_cleanup();
 371         apps_shutdown();
 372         OPENSSL_EXIT(ret);
 373         }
 374
 375 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)
 376         {
 377         CONF *cnf = NULL;
 378         int len;
 379         long errline;
 380         unsigned char *p;
 381         ASN1_TYPE *atyp = NULL;
 382
 383         if (genconf)
 384                 {
 385                 cnf = NCONF_new(NULL);
 386                 if (!NCONF_load(cnf, genconf, &errline))
 387                         goto conferr;
 388                 if (!genstr)
 389                         genstr = NCONF_get_string(cnf, "default", "asn1");
 390                 if (!genstr)
 391                         {
 392                         BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
 393                         goto err;
 394                         }
 395                 }
 396
 397         atyp = ASN1_generate_nconf(genstr, cnf);
 398         NCONF_free(cnf);
 399
 400         if (!atyp)
 401                 return -1;
 402
 403         len = i2d_ASN1_TYPE(atyp, NULL);
 404
 405         if (len <= 0)
 406                 goto err;
 407
 408         if (!BUF_MEM_grow(buf,len))
 409                 goto err;
 410
 411         p=(unsigned char *)buf->data;
 412
 413         i2d_ASN1_TYPE(atyp, &p);
 414
 415         ASN1_TYPE_free(atyp);
 416         return len;
 417
 418         conferr:
 419
 420         if (errline > 0)
 421                 BIO_printf(bio, "Error on line %ld of config file '%s'\n",
 422                                                         errline, genconf);
 423         else
 424                 BIO_printf(bio, "Error loading config file '%s'\n", genconf);
 425
 426         err:
 427         NCONF_free(cnf);
 428         ASN1_TYPE_free(atyp);
 429
 430         return -1;
 431
 432         }