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 <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 <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 /*-
  73  * -inform arg  - input format - default PEM (DER or PEM)
  74  * -in arg      - input file - default stdin
  75  * -i           - indent the details by depth
  76  * -offset      - where in the file to start
  77  * -length      - how many bytes to use
  78  * -oid file    - extra oid description file
  79  */
  80
  81 #undef PROG
  82 #define PROG    asn1parse_main
  83
  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, strictpem = 0;
  96         char *infile=NULL,*str=NULL,*prog,*oidfile=NULL, *derfile=NULL, *name=NULL, *header=NULL;
  97         char *genstr=NULL, *genconf=NULL;
  98         unsigned char *tmpbuf;
  99         const unsigned char *ctmpbuf;
 100         BUF_MEM *buf=NULL;
 101         STACK_OF(OPENSSL_STRING) *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_OPENSSL_STRING_new_null()) == NULL)
 119                 {
 120                 BIO_printf(bio_err,"Memory allocation failure\n");
 121                 goto end;
 122                 }
 123         while (argc >= 1)
 124                 {
 125                 if      (strcmp(*argv,"-inform") == 0)
 126                         {
 127                         if (--argc < 1) goto bad;
 128                         informat=str2fmt(*(++argv));
 129                         }
 130                 else if (strcmp(*argv,"-in") == 0)
 131                         {
 132                         if (--argc < 1) goto bad;
 133                         infile= *(++argv);
 134                         }
 135                 else if (strcmp(*argv,"-out") == 0)
 136                         {
 137                         if (--argc < 1) goto bad;
 138                         derfile= *(++argv);
 139                         }
 140                 else if (strcmp(*argv,"-i") == 0)
 141                         {
 142                         indent=1;
 143                         }
 144                 else if (strcmp(*argv,"-noout") == 0) noout = 1;
 145                 else if (strcmp(*argv,"-oid") == 0)
 146                         {
 147                         if (--argc < 1) goto bad;
 148                         oidfile= *(++argv);
 149                         }
 150                 else if (strcmp(*argv,"-offset") == 0)
 151                         {
 152                         if (--argc < 1) goto bad;
 153                         offset= atoi(*(++argv));
 154                         }
 155                 else if (strcmp(*argv,"-length") == 0)
 156                         {
 157                         if (--argc < 1) goto bad;
 158                         length= atoi(*(++argv));
 159                         if (length == 0) goto bad;
 160                         }
 161                 else if (strcmp(*argv,"-dump") == 0)
 162                         {
 163                         dump= -1;
 164                         }
 165                 else if (strcmp(*argv,"-dlimit") == 0)
 166                         {
 167                         if (--argc < 1) goto bad;
 168                         dump= atoi(*(++argv));
 169                         if (dump <= 0) goto bad;
 170                         }
 171                 else if (strcmp(*argv,"-strparse") == 0)
 172                         {
 173                         if (--argc < 1) goto bad;
 174                         sk_OPENSSL_STRING_push(osk,*(++argv));
 175                         }
 176                 else if (strcmp(*argv,"-genstr") == 0)
 177                         {
 178                         if (--argc < 1) goto bad;
 179                         genstr= *(++argv);
 180                         }
 181                 else if (strcmp(*argv,"-genconf") == 0)
 182                         {
 183                         if (--argc < 1) goto bad;
 184                         genconf= *(++argv);
 185                         }
 186                 else if (strcmp(*argv,"-strictpem") == 0)
 187                         {
 188                         strictpem = 1;
 189                         informat = FORMAT_PEM;
 190                         }
 191                 else
 192                         {
 193                         BIO_printf(bio_err,"unknown option %s\n",*argv);
 194                         badops=1;
 195                         break;
 196                         }
 197                 argc--;
 198                 argv++;
 199                 }
 200
 201         if (badops)
 202                 {
 203 bad:
 204                 BIO_printf(bio_err,"%s [options] <infile\n",prog);
 205                 BIO_printf(bio_err,"where options are\n");
 206                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
 207                 BIO_printf(bio_err," -in arg       input file\n");
 208                 BIO_printf(bio_err," -out arg      output file (output format is always DER\n");
 209                 BIO_printf(bio_err," -noout arg    don't produce any output\n");
 210                 BIO_printf(bio_err," -offset arg   offset into file\n");
 211                 BIO_printf(bio_err," -length arg   length of section in file\n");
 212                 BIO_printf(bio_err," -i            indent entries\n");
 213                 BIO_printf(bio_err," -dump         dump unknown data in hex form\n");
 214                 BIO_printf(bio_err," -dlimit arg   dump the first arg bytes of unknown data in hex form\n");
 215                 BIO_printf(bio_err," -oid file     file of extra oid definitions\n");
 216                 BIO_printf(bio_err," -strparse offset\n");
 217                 BIO_printf(bio_err,"               a series of these can be used to 'dig' into multiple\n");
 218                 BIO_printf(bio_err,"               ASN1 blob wrappings\n");
 219                 BIO_printf(bio_err," -genstr str   string to generate ASN1 structure from\n");
 220                 BIO_printf(bio_err," -genconf file file to generate ASN1 structure from\n");
 221                 BIO_printf(bio_err," -strictpem    do not attempt base64 decode outside PEM markers (-inform \n");
 222                 BIO_printf(bio_err,"               will be ignored)\n");
 223                 goto end;
 224                 }
 225
 226         ERR_load_crypto_strings();
 227
 228         in=BIO_new(BIO_s_file());
 229         out=BIO_new(BIO_s_file());
 230         if ((in == NULL) || (out == NULL))
 231                 {
 232                 ERR_print_errors(bio_err);
 233                 goto end;
 234                 }
 235         BIO_set_fp(out,stdout,BIO_NOCLOSE|BIO_FP_TEXT);
 236 #ifdef OPENSSL_SYS_VMS
 237         {
 238         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 239         out = BIO_push(tmpbio, out);
 240         }
 241 #endif
 242
 243         if (oidfile != NULL)
 244                 {
 245                 if (BIO_read_filename(in,oidfile) <= 0)
 246                         {
 247                         BIO_printf(bio_err,"problems opening %s\n",oidfile);
 248                         ERR_print_errors(bio_err);
 249                         goto end;
 250                         }
 251                 OBJ_create_objects(in);
 252                 }
 253
 254         if (infile == NULL)
 255                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
 256         else
 257                 {
 258                 if (BIO_read_filename(in,infile) <= 0)
 259                         {
 260                         perror(infile);
 261                         goto end;
 262                         }
 263                 }
 264
 265         if (derfile) {
 266                 if(!(derout = BIO_new_file(derfile, "wb"))) {
 267                         BIO_printf(bio_err,"problems opening %s\n",derfile);
 268                         ERR_print_errors(bio_err);
 269                         goto end;
 270                 }
 271         }
 272
 273         if(strictpem)
 274                 {
 275                 if(PEM_read_bio(in, &name, &header, (unsigned char **)&str, &num) != 1)
 276                         {
 277                         BIO_printf(bio_err,"Error reading PEM file\n");
 278                         ERR_print_errors(bio_err);
 279                         goto end;
 280                         }
 281                 }
 282         else
 283                 {
 284
 285                 if ((buf=BUF_MEM_new()) == NULL) goto end;
 286                 if (!BUF_MEM_grow(buf,BUFSIZ*8)) goto end; /* Pre-allocate :-) */
 287
 288                 if (genstr || genconf)
 289                         {
 290                         num = do_generate(bio_err, genstr, genconf, buf);
 291                         if (num < 0)
 292                                 {
 293                                 ERR_print_errors(bio_err);
 294                                 goto end;
 295                                 }
 296                         }
 297
 298                 else
 299                         {
 300
 301                         if (informat == FORMAT_PEM)
 302                                 {
 303                                 BIO *tmp;
 304
 305                                 if ((b64=BIO_new(BIO_f_base64())) == NULL)
 306                                         goto end;
 307                                 BIO_push(b64,in);
 308                                 tmp=in;
 309                                 in=b64;
 310                                 b64=tmp;
 311                                 }
 312
 313                         num=0;
 314                         for (;;)
 315                                 {
 316                                 if (!BUF_MEM_grow(buf,(int)num+BUFSIZ)) goto end;
 317                                 i=BIO_read(in,&(buf->data[num]),BUFSIZ);
 318                                 if (i <= 0) break;
 319                                 num+=i;
 320                                 }
 321                         }
 322                 str=buf->data;
 323
 324                 }
 325
 326         /* If any structs to parse go through in sequence */
 327
 328         if (sk_OPENSSL_STRING_num(osk))
 329                 {
 330                 tmpbuf=(unsigned char *)str;
 331                 tmplen=num;
 332                 for (i=0; i<sk_OPENSSL_STRING_num(osk); i++)
 333                         {
 334                         ASN1_TYPE *atmp;
 335                         int typ;
 336                         j=atoi(sk_OPENSSL_STRING_value(osk,i));
 337                         if (j == 0)
 338                                 {
 339                                 BIO_printf(bio_err,"'%s' is an invalid number\n",sk_OPENSSL_STRING_value(osk,i));
 340                                 continue;
 341                                 }
 342                         tmpbuf+=j;
 343                         tmplen-=j;
 344                         atmp = at;
 345                         ctmpbuf = tmpbuf;
 346                         at = d2i_ASN1_TYPE(NULL,&ctmpbuf,tmplen);
 347                         ASN1_TYPE_free(atmp);
 348                         if(!at)
 349                                 {
 350                                 BIO_printf(bio_err,"Error parsing structure\n");
 351                                 ERR_print_errors(bio_err);
 352                                 goto end;
 353                                 }
 354                         typ = ASN1_TYPE_get(at);
 355                         if ((typ == V_ASN1_OBJECT)
 356                                 || (typ == V_ASN1_NULL))
 357                                 {
 358                                 BIO_printf(bio_err, "Can't parse %s type\n",
 359                                         typ == V_ASN1_NULL ? "NULL" : "OBJECT");
 360                                 ERR_print_errors(bio_err);
 361                                 goto end;
 362                                 }
 363                         /* hmm... this is a little evil but it works */
 364                         tmpbuf=at->value.asn1_string->data;
 365                         tmplen=at->value.asn1_string->length;
 366                         }
 367                 str=(char *)tmpbuf;
 368                 num=tmplen;
 369                 }
 370
 371         if (offset >= num)
 372                 {
 373                 BIO_printf(bio_err, "Error: offset too large\n");
 374                 goto end;
 375                 }
 376
 377         num -= offset;
 378
 379         if ((length == 0) || ((long)length > num)) length=(unsigned int)num;
 380         if(derout) {
 381                 if(BIO_write(derout, str + offset, length) != (int)length) {
 382                         BIO_printf(bio_err, "Error writing output\n");
 383                         ERR_print_errors(bio_err);
 384                         goto end;
 385                 }
 386         }
 387         if (!noout &&
 388             !ASN1_parse_dump(out,(unsigned char *)&(str[offset]),length,
 389                     indent,dump))
 390                 {
 391                 ERR_print_errors(bio_err);
 392                 goto end;
 393                 }
 394         ret=0;
 395 end:
 396         BIO_free(derout);
 397         if (in != NULL) BIO_free(in);
 398         if (out != NULL) BIO_free_all(out);
 399         if (b64 != NULL) BIO_free(b64);
 400         if (ret != 0)
 401                 ERR_print_errors(bio_err);
 402         if (buf != NULL) BUF_MEM_free(buf);
 403         if (name != NULL) OPENSSL_free(name);
 404         if (header != NULL) OPENSSL_free(header);
 405         if (strictpem && str != NULL) OPENSSL_free(str);
 406         if (at != NULL) ASN1_TYPE_free(at);
 407         if (osk != NULL) sk_OPENSSL_STRING_free(osk);
 408         OBJ_cleanup();
 409         apps_shutdown();
 410         OPENSSL_EXIT(ret);
 411         }
 412
 413 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)
 414         {
 415         CONF *cnf = NULL;
 416         int len;
 417         long errline;
 418         unsigned char *p;
 419         ASN1_TYPE *atyp = NULL;
 420
 421         if (genconf)
 422                 {
 423                 cnf = NCONF_new(NULL);
 424                 if (!NCONF_load(cnf, genconf, &errline))
 425                         goto conferr;
 426                 if (!genstr)
 427                         genstr = NCONF_get_string(cnf, "default", "asn1");
 428                 if (!genstr)
 429                         {
 430                         BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
 431                         goto err;
 432                         }
 433                 }
 434
 435         atyp = ASN1_generate_nconf(genstr, cnf);
 436         NCONF_free(cnf);
 437         cnf = NULL;
 438
 439         if (!atyp)
 440                 return -1;
 441
 442         len = i2d_ASN1_TYPE(atyp, NULL);
 443
 444         if (len <= 0)
 445                 goto err;
 446
 447         if (!BUF_MEM_grow(buf,len))
 448                 goto err;
 449
 450         p=(unsigned char *)buf->data;
 451
 452         i2d_ASN1_TYPE(atyp, &p);
 453
 454         ASN1_TYPE_free(atyp);
 455         return len;
 456
 457         conferr:
 458
 459         if (errline > 0)
 460                 BIO_printf(bio, "Error on line %ld of config file '%s'\n",
 461                                                         errline, genconf);
 462         else
 463                 BIO_printf(bio, "Error loading config file '%s'\n", genconf);
 464
 465         err:
 466         NCONF_free(cnf);
 467         ASN1_TYPE_free(atyp);
 468
 469         return -1;
 470
 471         }