lib/asn1/asn1_print.c

   1 /*
   2  * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "der_locl.h"
  35 #include <com_err.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <getarg.h>
  39 #include <err.h>
  40 #include <der.h>
  41
  42 RCSID("$Id$");
  43
  44 static int indent_flag = 1;
  45
  46 static unsigned long indefinite_form_loop;
  47 static unsigned long indefinite_form_loop_max = 10000;
  48
  49 static size_t
  50 loop (unsigned char *buf, size_t len, int indent)
  51 {
  52     unsigned char *start_buf = buf;
  53
  54     while (len > 0) {
  55         int ret;
  56         Der_class class;
  57         Der_type type;
  58         unsigned int tag;
  59         size_t sz;
  60         size_t length;
  61         size_t loop_length = 0;
  62         int end_tag = 0;
  63         const char *tagname;
  64
  65         ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
  66         if (ret)
  67             errx (1, "der_get_tag: %s", error_message (ret));
  68         if (sz > len)
  69             errx (1, "unreasonable length (%u) > %u",
  70                   (unsigned)sz, (unsigned)len);
  71         buf += sz;
  72         len -= sz;
  73         if (indent_flag) {
  74             int i;
  75             for (i = 0; i < indent; ++i)
  76                 printf (" ");
  77         }
  78         printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
  79         tagname = der_get_tag_name(tag);
  80         if (class == ASN1_C_UNIV && tagname != NULL)
  81             printf ("%s = ", tagname);
  82         else
  83             printf ("tag %d = ", tag);
  84         ret = der_get_length (buf, len, &length, &sz);
  85         if (ret)
  86             errx (1, "der_get_tag: %s", error_message (ret));
  87         if (sz > len)
  88             errx (1, "unreasonable tag length (%u) > %u",
  89                   (unsigned)sz, (unsigned)len);
  90         buf += sz;
  91         len -= sz;
  92         if (length == ASN1_INDEFINITE) {
  93             if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
  94                 (class == ASN1_C_CONTEXT && type == CONS) ||
  95                 (class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
  96                 (class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
  97                 printf("*INDEFINITE FORM*");
  98             } else {
  99                 fflush(stdout);
 100                 errx(1, "indef form used on unsupported object");
 101             }
 102             end_tag = 1;
 103             if (indefinite_form_loop > indefinite_form_loop_max)
 104                 errx(1, "indefinite form used recursively more then %lu "
 105                      "times, aborting", indefinite_form_loop_max);
 106             indefinite_form_loop++;
 107             length = len;
 108         } else if (length > len) {
 109             printf("\n");
 110             fflush(stdout);
 111             errx (1, "unreasonable inner length (%u) > %u",
 112                   (unsigned)length, (unsigned)len);
 113         }
 114         if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
 115             printf ("%lu bytes [%u]", (unsigned long)length, tag);
 116             if (type == CONS) {
 117                 printf("\n");
 118                 loop_length = loop (buf, length, indent + 2);
 119             } else {
 120                 printf(" IMPLICIT content\n");
 121             }
 122         } else if (class == ASN1_C_UNIV) {
 123             switch (tag) {
 124             case UT_EndOfContent:
 125                 printf (" INDEFINITE length was %lu\n",
 126                         (unsigned long)(buf - start_buf));
 127                 break;
 128             case UT_Set :
 129             case UT_Sequence :
 130                 printf ("%lu bytes {\n", (unsigned long)length);
 131                 loop_length = loop (buf, length, indent + 2);
 132                 if (indent_flag) {
 133                     int i;
 134                     for (i = 0; i < indent; ++i)
 135                         printf (" ");
 136                     printf ("}\n");
 137                 } else
 138                     printf ("} indent = %d\n", indent / 2);
 139                 break;
 140             case UT_Integer : {
 141                 int val;
 142
 143                 if (length <= sizeof(val)) {
 144                     ret = der_get_integer (buf, length, &val, NULL);
 145                     if (ret)
 146                         errx (1, "der_get_integer: %s", error_message (ret));
 147                     printf ("integer %d\n", val);
 148                 } else {
 149                     heim_integer vali;
 150                     char *p;
 151
 152                     ret = der_get_heim_integer(buf, length, &vali, NULL);
 153                     if (ret)
 154                         errx (1, "der_get_heim_integer: %s",
 155                               error_message (ret));
 156                     ret = der_print_hex_heim_integer(&vali, &p);
 157                     if (ret)
 158                         errx (1, "der_print_hex_heim_integer: %s",
 159                               error_message (ret));
 160                     printf ("BIG NUM integer: length %lu %s\n",
 161                             (unsigned long)length, p);
 162                     free(p);
 163                 }
 164                 break;
 165             }
 166             case UT_OctetString : {
 167                 heim_octet_string str;
 168                 int i;
 169                 unsigned char *uc;
 170
 171                 ret = der_get_octet_string (buf, length, &str, NULL);
 172                 if (ret)
 173                     errx (1, "der_get_octet_string: %s", error_message (ret));
 174                 printf ("(length %lu), ", (unsigned long)length);
 175                 uc = (unsigned char *)str.data;
 176                 for (i = 0; i < min(16,length); ++i)
 177                     printf ("%02x", uc[i]);
 178                 printf ("\n");
 179                 free (str.data);
 180                 break;
 181             }
 182             case UT_GeneralizedTime :
 183             case UT_GeneralString :
 184             case UT_PrintableString :
 185             case UT_VisibleString : {
 186                 heim_general_string str;
 187
 188                 ret = der_get_general_string (buf, length, &str, NULL);
 189                 if (ret)
 190                     errx (1, "der_get_general_string: %s",
 191                           error_message (ret));
 192                 printf ("\"%s\"\n", str);
 193                 free (str);
 194                 break;
 195             }
 196             case UT_OID: {
 197                 heim_oid o;
 198                 char *p;
 199
 200                 ret = der_get_oid(buf, length, &o, NULL);
 201                 if (ret)
 202                     errx (1, "der_get_oid: %s", error_message (ret));
 203                 ret = der_print_heim_oid(&o, '.', &p);
 204                 der_free_oid(&o);
 205                 if (ret)
 206                     errx (1, "der_print_heim_oid: %s", error_message (ret));
 207                 printf("%s\n", p);
 208                 free(p);
 209
 210                 break;
 211             }
 212             case UT_Enumerated: {
 213                 int num;
 214
 215                 ret = der_get_integer (buf, length, &num, NULL);
 216                 if (ret)
 217                     errx (1, "der_get_enum: %s", error_message (ret));
 218
 219                 printf("%u\n", num);
 220                 break;
 221             }
 222             default :
 223                 printf ("%lu bytes\n", (unsigned long)length);
 224                 break;
 225             }
 226         }
 227         if (end_tag) {
 228             if (loop_length == 0)
 229                 errx(1, "zero length INDEFINITE data ? indent = %d\n",
 230                      indent / 2);
 231             if (loop_length < length)
 232                 length = loop_length;
 233             if (indefinite_form_loop == 0)
 234                 errx(1, "internal error in indefinite form loop detection");
 235             indefinite_form_loop--;
 236         } else if (loop_length)
 237             errx(1, "internal error for INDEFINITE form");
 238         buf += length;
 239         len -= length;
 240     }
 241     return 0;
 242 }
 243
 244 static int
 245 doit (const char *filename)
 246 {
 247     int fd = open (filename, O_RDONLY);
 248     struct stat sb;
 249     unsigned char *buf;
 250     size_t len;
 251     int ret;
 252
 253     if(fd < 0)
 254         err (1, "opening %s for read", filename);
 255     if (fstat (fd, &sb) < 0)
 256         err (1, "stat %s", filename);
 257     len = sb.st_size;
 258     buf = emalloc (len);
 259     if (read (fd, buf, len) != len)
 260         errx (1, "read failed");
 261     close (fd);
 262     ret = loop (buf, len, 0);
 263     free (buf);
 264     return 0;
 265 }
 266
 267
 268 static int version_flag;
 269 static int help_flag;
 270 struct getargs args[] = {
 271     { "indent", 0, arg_negative_flag, &indent_flag },
 272     { "version", 0, arg_flag, &version_flag },
 273     { "help", 0, arg_flag, &help_flag }
 274 };
 275 int num_args = sizeof(args) / sizeof(args[0]);
 276
 277 static void
 278 usage(int code)
 279 {
 280     arg_printusage(args, num_args, NULL, "dump-file");
 281     exit(code);
 282 }
 283
 284 int
 285 main(int argc, char **argv)
 286 {
 287     int optidx = 0;
 288
 289     setprogname (argv[0]);
 290     initialize_asn1_error_table ();
 291     if(getarg(args, num_args, argc, argv, &optidx))
 292         usage(1);
 293     if(help_flag)
 294         usage(0);
 295     if(version_flag) {
 296         print_version(NULL);
 297         exit(0);
 298     }
 299     argv += optidx;
 300     argc -= optidx;
 301     if (argc != 1)
 302         usage (1);
 303     return doit (argv[0]);
 304 }