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 /* -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 /* Minimum buffer size to be used */
  84 #define MIN_BUFFER      256
  85
  86 int MAIN(int, char **);
  87
  88 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);
  89
  90 int MAIN(int argc, char **argv)
  91         {
  92         int i,badops=0,offset=0,ret=1,j;
  93         unsigned int length=0;
  94         long num,tmplen;
  95         BIO *in=NULL,*out=NULL,*b64=NULL, *derout = NULL;
  96         int informat,indent=0, noout = 0, dump = 0, strictpem = 0;
  97         char *infile=NULL,*str=NULL,*prog,*oidfile=NULL, *derfile=NULL;
  98         char *genstr=NULL, *genconf=NULL;
  99         unsigned char *tmpbuf;
 100         const unsigned char *ctmpbuf;
 101         BUF_MEM *buf=NULL;
 102         STACK_OF(OPENSSL_STRING) *osk=NULL;
 103         ASN1_TYPE *at=NULL;
 104
 105         informat=FORMAT_PEM;
 106
 107         apps_startup();
 108
 109         if (bio_err == NULL)
 110                 if ((bio_err=BIO_new(BIO_s_file())) != NULL)
 111                         BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
 112
 113         if (!load_config(bio_err, NULL))
 114                 goto end;
 115
 116         prog=argv[0];
 117         argc--;
 118         argv++;
 119         if ((osk=sk_OPENSSL_STRING_new_null()) == NULL)
 120                 {
 121                 BIO_printf(bio_err,"Memory allocation failure\n");
 122                 goto end;
 123                 }
 124         while (argc >= 1)
 125                 {
 126                 if      (strcmp(*argv,"-inform") == 0)
 127                         {
 128                         if (--argc < 1) goto bad;
 129                         informat=str2fmt(*(++argv));
 130                         }
 131                 else if (strcmp(*argv,"-in") == 0)
 132                         {
 133                         if (--argc < 1) goto bad;
 134                         infile= *(++argv);
 135                         }
 136                 else if (strcmp(*argv,"-out") == 0)
 137                         {
 138                         if (--argc < 1) goto bad;
 139                         derfile= *(++argv);
 140                         }
 141                 else if (strcmp(*argv,"-i") == 0)
 142                         {
 143                         indent=1;
 144                         }
 145                 else if (strcmp(*argv,"-noout") == 0) noout = 1;
 146                 else if (strcmp(*argv,"-oid") == 0)
 147                         {
 148                         if (--argc < 1) goto bad;
 149                         oidfile= *(++argv);
 150                         }
 151                 else if (strcmp(*argv,"-offset") == 0)
 152                         {
 153                         if (--argc < 1) goto bad;
 154                         offset= atoi(*(++argv));
 155                         }
 156                 else if (strcmp(*argv,"-length") == 0)
 157                         {
 158                         if (--argc < 1) goto bad;
 159                         length= atoi(*(++argv));
 160                         if (length == 0) goto bad;
 161                         }
 162                 else if (strcmp(*argv,"-dump") == 0)
 163                         {
 164                         dump= -1;
 165                         }
 166                 else if (strcmp(*argv,"-dlimit") == 0)
 167                         {
 168                         if (--argc < 1) goto bad;
 169                         dump= atoi(*(++argv));
 170                         if (dump <= 0) goto bad;
 171                         }
 172                 else if (strcmp(*argv,"-strparse") == 0)
 173                         {
 174                         if (--argc < 1) goto bad;
 175                         sk_OPENSSL_STRING_push(osk,*(++argv));
 176                         }
 177                 else if (strcmp(*argv,"-genstr") == 0)
 178                         {
 179                         if (--argc < 1) goto bad;
 180                         genstr= *(++argv);
 181                         }
 182                 else if (strcmp(*argv,"-genconf") == 0)
 183                         {
 184                         if (--argc < 1) goto bad;
 185                         genconf= *(++argv);
 186                         }
 187                 else if (strcmp(*argv,"-strictpem") == 0)
 188                         {
 189                         strictpem = 1;
 190                         informat = FORMAT_PEM;
 191                         }
 192                 else
 193                         {
 194                         BIO_printf(bio_err,"unknown option %s\n",*argv);
 195                         badops=1;
 196                         break;
 197                         }
 198                 argc--;
 199                 argv++;
 200                 }
 201
 202         if (badops)
 203                 {
 204 bad:
 205                 BIO_printf(bio_err,"%s [options] <infile\n",prog);
 206                 BIO_printf(bio_err,"where options are\n");
 207                 BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
 208                 BIO_printf(bio_err," -in arg       input file\n");
 209                 BIO_printf(bio_err," -out arg      output file (output format is always DER\n");
 210                 BIO_printf(bio_err," -noout arg    don't produce any output\n");
 211                 BIO_printf(bio_err," -offset arg   offset into file\n");
 212                 BIO_printf(bio_err," -length arg   length of section in file\n");
 213                 BIO_printf(bio_err," -i            indent entries\n");
 214                 BIO_printf(bio_err," -dump         dump unknown data in hex form\n");
 215                 BIO_printf(bio_err," -dlimit arg   dump the first arg bytes of unknown data in hex form\n");
 216                 BIO_printf(bio_err," -oid file     file of extra oid definitions\n");
 217                 BIO_printf(bio_err," -strparse offset\n");
 218                 BIO_printf(bio_err,"               a series of these can be used to 'dig' into multiple\n");
 219                 BIO_printf(bio_err,"               ASN1 blob wrappings\n");
 220                 BIO_printf(bio_err," -genstr str   string to generate ASN1 structure from\n");
 221                 BIO_printf(bio_err," -genconf file file to generate ASN1 structure from\n");
 222                 BIO_printf(bio_err," -strictpem    do not attempt base64 decode outside PEM markers (-inform \n");
 223                 BIO_printf(bio_err,"               will be ignored)\n");
 224                 goto end;
 225                 }
 226
 227         ERR_load_crypto_strings();
 228
 229         in=BIO_new(BIO_s_file());
 230         out=BIO_new(BIO_s_file());
 231         if ((in == NULL) || (out == NULL))
 232                 {
 233                 ERR_print_errors(bio_err);
 234                 goto end;
 235                 }
 236         BIO_set_fp(out,stdout,BIO_NOCLOSE|BIO_FP_TEXT);
 237 #ifdef OPENSSL_SYS_VMS
 238         {
 239         BIO *tmpbio = BIO_new(BIO_f_linebuffer());
 240         out = BIO_push(tmpbio, out);
 241         }
 242 #endif
 243
 244         if (oidfile != NULL)
 245                 {
 246                 if (BIO_read_filename(in,oidfile) <= 0)
 247                         {
 248                         BIO_printf(bio_err,"problems opening %s\n",oidfile);
 249                         ERR_print_errors(bio_err);
 250                         goto end;
 251                         }
 252                 OBJ_create_objects(in);
 253                 }
 254
 255         if (infile == NULL)
 256                 BIO_set_fp(in,stdin,BIO_NOCLOSE);
 257         else
 258                 {
 259                 if (BIO_read_filename(in,infile) <= 0)
 260                         {
 261                         perror(infile);
 262                         goto end;
 263                         }
 264                 }
 265
 266         if (derfile) {
 267                 if(!(derout = BIO_new_file(derfile, "wb"))) {
 268                         BIO_printf(bio_err,"problems opening %s\n",derfile);
 269                         ERR_print_errors(bio_err);
 270                         goto end;
 271                 }
 272         }
 273
 274         if ((buf=BUF_MEM_new()) == NULL) goto end;
 275         if (!BUF_MEM_grow(buf,(BUFSIZ*8)<MIN_BUFFER?MIN_BUFFER:(BUFSIZ*8))) goto end; /* Pre-allocate :-) */
 276
 277         if (genstr || genconf)
 278                 {
 279                 num = do_generate(bio_err, genstr, genconf, buf);
 280                 if (num < 0)
 281                         {
 282                         ERR_print_errors(bio_err);
 283                         goto end;
 284                         }
 285                 }
 286
 287         else
 288                 {
 289
 290                 if (informat == FORMAT_PEM)
 291                         {
 292                         BIO *tmp;
 293
 294                         if(strictpem)
 295                                 {
 296                                 for (;;)
 297                                         {
 298                                         /* Read a line */
 299                                         i=BIO_gets(in,buf->data,MIN_BUFFER-1);
 300
 301                                         if (i <= 0)
 302                                                 {
 303                                                 BIO_printf(bio_err, "Error: Cannot find start line\n");
 304                                                 goto end;
 305                                                 }
 306
 307                                         /* Strip trailing spaces etc */
 308                                         do
 309                                                 i--;
 310                                         while ((i >= 0) && (buf->data[i]  <= ' '));
 311
 312                                         buf->data[++i]='\0';
 313
 314                                         /* Check if we have a PEM BEGIN marker */
 315                                         if (strncmp(buf->data,"-----BEGIN ",11) == 0)
 316                                                 {
 317                                                 if (strncmp(&(buf->data[i-5]),"-----",5) != 0)
 318                                                         continue;
 319                                                 break;
 320                                                 }
 321                                         }
 322                                 }
 323
 324
 325
 326                         if ((b64=BIO_new(BIO_f_base64())) == NULL)
 327                                 goto end;
 328                         BIO_push(b64,in);
 329                         tmp=in;
 330                         in=b64;
 331                         b64=tmp;
 332                         }
 333
 334                 num=0;
 335                 for (;;)
 336                         {
 337                         if (!BUF_MEM_grow(buf,(int)num+BUFSIZ)) goto end;
 338                         i=BIO_read(in,&(buf->data[num]),BUFSIZ);
 339                         if (i <= 0) break;
 340                         num+=i;
 341                         }
 342                 }
 343         str=buf->data;
 344
 345         /* If any structs to parse go through in sequence */
 346
 347         if (sk_OPENSSL_STRING_num(osk))
 348                 {
 349                 tmpbuf=(unsigned char *)str;
 350                 tmplen=num;
 351                 for (i=0; i<sk_OPENSSL_STRING_num(osk); i++)
 352                         {
 353                         ASN1_TYPE *atmp;
 354                         int typ;
 355                         j=atoi(sk_OPENSSL_STRING_value(osk,i));
 356                         if (j == 0)
 357                                 {
 358                                 BIO_printf(bio_err,"'%s' is an invalid number\n",sk_OPENSSL_STRING_value(osk,i));
 359                                 continue;
 360                                 }
 361                         tmpbuf+=j;
 362                         tmplen-=j;
 363                         atmp = at;
 364                         ctmpbuf = tmpbuf;
 365                         at = d2i_ASN1_TYPE(NULL,&ctmpbuf,tmplen);
 366                         ASN1_TYPE_free(atmp);
 367                         if(!at)
 368                                 {
 369                                 BIO_printf(bio_err,"Error parsing structure\n");
 370                                 ERR_print_errors(bio_err);
 371                                 goto end;
 372                                 }
 373                         typ = ASN1_TYPE_get(at);
 374                         if ((typ == V_ASN1_OBJECT)
 375                                 || (typ == V_ASN1_NULL))
 376                                 {
 377                                 BIO_printf(bio_err, "Can't parse %s type\n",
 378                                         typ == V_ASN1_NULL ? "NULL" : "OBJECT");
 379                                 ERR_print_errors(bio_err);
 380                                 goto end;
 381                                 }
 382                         /* hmm... this is a little evil but it works */
 383                         tmpbuf=at->value.asn1_string->data;
 384                         tmplen=at->value.asn1_string->length;
 385                         }
 386                 str=(char *)tmpbuf;
 387                 num=tmplen;
 388                 }
 389
 390         if (offset >= num)
 391                 {
 392                 BIO_printf(bio_err, "Error: offset too large\n");
 393                 goto end;
 394                 }
 395
 396         num -= offset;
 397
 398         if ((length == 0) || ((long)length > num)) length=(unsigned int)num;
 399         if(derout) {
 400                 if(BIO_write(derout, str + offset, length) != (int)length) {
 401                         BIO_printf(bio_err, "Error writing output\n");
 402                         ERR_print_errors(bio_err);
 403                         goto end;
 404                 }
 405         }
 406         if (!noout &&
 407             !ASN1_parse_dump(out,(unsigned char *)&(str[offset]),length,
 408                     indent,dump))
 409                 {
 410                 ERR_print_errors(bio_err);
 411                 goto end;
 412                 }
 413         ret=0;
 414 end:
 415         BIO_free(derout);
 416         if (in != NULL) BIO_free(in);
 417         if (out != NULL) BIO_free_all(out);
 418         if (b64 != NULL) BIO_free(b64);
 419         if (ret != 0)
 420                 ERR_print_errors(bio_err);
 421         if (buf != NULL) BUF_MEM_free(buf);
 422         if (at != NULL) ASN1_TYPE_free(at);
 423         if (osk != NULL) sk_OPENSSL_STRING_free(osk);
 424         OBJ_cleanup();
 425         apps_shutdown();
 426         OPENSSL_EXIT(ret);
 427         }
 428
 429 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)
 430         {
 431         CONF *cnf = NULL;
 432         int len;
 433         long errline;
 434         unsigned char *p;
 435         ASN1_TYPE *atyp = NULL;
 436
 437         if (genconf)
 438                 {
 439                 cnf = NCONF_new(NULL);
 440                 if (!NCONF_load(cnf, genconf, &errline))
 441                         goto conferr;
 442                 if (!genstr)
 443                         genstr = NCONF_get_string(cnf, "default", "asn1");
 444                 if (!genstr)
 445                         {
 446                         BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
 447                         goto err;
 448                         }
 449                 }
 450
 451         atyp = ASN1_generate_nconf(genstr, cnf);
 452         NCONF_free(cnf);
 453         cnf = NULL;
 454
 455         if (!atyp)
 456                 return -1;
 457
 458         len = i2d_ASN1_TYPE(atyp, NULL);
 459
 460         if (len <= 0)
 461                 goto err;
 462
 463         if (!BUF_MEM_grow(buf,len))
 464                 goto err;
 465
 466         p=(unsigned char *)buf->data;
 467
 468         i2d_ASN1_TYPE(atyp, &p);
 469
 470         ASN1_TYPE_free(atyp);
 471         return len;
 472
 473         conferr:
 474
 475         if (errline > 0)
 476                 BIO_printf(bio, "Error on line %ld of config file '%s'\n",
 477                                                         errline, genconf);
 478         else
 479                 BIO_printf(bio, "Error loading config file '%s'\n", genconf);
 480
 481         err:
 482         NCONF_free(cnf);
 483         ASN1_TYPE_free(atyp);
 484
 485         return -1;
 486
 487         }