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  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "der_locl.h"
  37 #include <com_err.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <getarg.h>
  41 #include <err.h>
  42 #include <der.h>
  43
  44 static int indent_flag = 1;
  45 static int inner_flag = 0;
  46
  47 static unsigned long indefinite_form_loop;
  48 static unsigned long indefinite_form_loop_max = 10000;
  49
  50 static size_t
  51 loop (unsigned char *buf, size_t len, int indent)
  52 {
  53     unsigned char *start_buf = buf;
  54
  55     while (len > 0) {
  56         int ret;
  57         Der_class class;
  58         Der_type type;
  59         unsigned int tag;
  60         size_t sz;
  61         size_t length;
  62         size_t loop_length = 0;
  63         int end_tag = 0;
  64         const char *tagname;
  65
  66         ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
  67         if (ret)
  68             errx (1, "der_get_tag: %s", error_message (ret));
  69         if (sz > len)
  70             errx (1, "unreasonable length (%u) > %u",
  71                   (unsigned)sz, (unsigned)len);
  72         buf += sz;
  73         len -= sz;
  74         if (indent_flag) {
  75             int i;
  76             for (i = 0; i < indent; ++i)
  77                 printf (" ");
  78         }
  79         printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
  80         tagname = der_get_tag_name(tag);
  81         if (class == ASN1_C_UNIV && tagname != NULL)
  82             printf ("%s = ", tagname);
  83         else
  84             printf ("tag %d = ", tag);
  85         ret = der_get_length (buf, len, &length, &sz);
  86         if (ret)
  87             errx (1, "der_get_tag: %s", error_message (ret));
  88         if (sz > len)
  89             errx (1, "unreasonable tag length (%u) > %u",
  90                   (unsigned)sz, (unsigned)len);
  91         buf += sz;
  92         len -= sz;
  93         if (length == ASN1_INDEFINITE) {
  94             if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
  95                 (class == ASN1_C_CONTEXT && type == CONS) ||
  96                 (class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
  97                 (class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
  98                 printf("*INDEFINITE FORM*");
  99             } else {
 100                 fflush(stdout);
 101                 errx(1, "indef form used on unsupported object");
 102             }
 103             end_tag = 1;
 104             if (indefinite_form_loop > indefinite_form_loop_max)
 105                 errx(1, "indefinite form used recursively more then %lu "
 106                      "times, aborting", indefinite_form_loop_max);
 107             indefinite_form_loop++;
 108             length = len;
 109         } else if (length > len) {
 110             printf("\n");
 111             fflush(stdout);
 112             errx (1, "unreasonable inner length (%u) > %u",
 113                   (unsigned)length, (unsigned)len);
 114         }
 115         if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
 116             printf ("%lu bytes [%u]", (unsigned long)length, tag);
 117             if (type == CONS) {
 118                 printf("\n");
 119                 loop_length = loop (buf, length, indent + 2);
 120             } else {
 121                 printf(" IMPLICIT content\n");
 122             }
 123         } else if (class == ASN1_C_UNIV) {
 124             switch (tag) {
 125             case UT_EndOfContent:
 126                 printf (" INDEFINITE length was %lu\n",
 127                         (unsigned long)(buf - start_buf));
 128                 break;
 129             case UT_Set :
 130             case UT_Sequence :
 131                 printf ("%lu bytes {\n", (unsigned long)length);
 132                 loop_length = loop (buf, length, indent + 2);
 133                 if (indent_flag) {
 134                     int i;
 135                     for (i = 0; i < indent; ++i)
 136                         printf (" ");
 137                     printf ("}\n");
 138                 } else
 139                     printf ("} indent = %d\n", indent / 2);
 140                 break;
 141             case UT_Integer : {
 142                 int val;
 143
 144                 if (length <= sizeof(val)) {
 145                     ret = der_get_integer (buf, length, &val, NULL);
 146                     if (ret)
 147                         errx (1, "der_get_integer: %s", error_message (ret));
 148                     printf ("integer %d\n", val);
 149                 } else {
 150                     heim_integer vali;
 151                     char *p;
 152
 153                     ret = der_get_heim_integer(buf, length, &vali, NULL);
 154                     if (ret)
 155                         errx (1, "der_get_heim_integer: %s",
 156                               error_message (ret));
 157                     ret = der_print_hex_heim_integer(&vali, &p);
 158                     if (ret)
 159                         errx (1, "der_print_hex_heim_integer: %s",
 160                               error_message (ret));
 161                     printf ("BIG NUM integer: length %lu %s\n",
 162                             (unsigned long)length, p);
 163                     free(p);
 164                 }
 165                 break;
 166             }
 167             case UT_OctetString : {
 168                 heim_octet_string str;
 169                 size_t i;
 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
 176                 if (inner_flag) {
 177                     Der_class class;
 178                     Der_type type;
 179                     unsigned int tag;
 180
 181                     ret = der_get_tag(str.data, str.length,
 182                                       &class, &type, &tag, &sz);
 183                     if (ret || sz > str.length ||
 184                         type != CONS || tag != UT_Sequence)
 185                         goto just_an_octet_string;
 186
 187                     printf("{\n");
 188                     loop (str.data, str.length, indent + 2);
 189                     for (i = 0; i < indent; ++i)
 190                         printf (" ");
 191                     printf ("}\n");
 192
 193                 } else {
 194                     unsigned char *uc;
 195
 196                 just_an_octet_string:
 197                     uc = (unsigned char *)str.data;
 198                     for (i = 0; i < min(16,length); ++i)
 199                         printf ("%02x", uc[i]);
 200                     printf ("\n");
 201                 }
 202                 free (str.data);
 203                 break;
 204             }
 205             case UT_IA5String :
 206             case UT_PrintableString : {
 207                 heim_printable_string str;
 208                 unsigned char *s;
 209                 size_t n;
 210
 211                 memset(&str, 0, sizeof(str));
 212
 213                 ret = der_get_printable_string (buf, length, &str, NULL);
 214                 if (ret)
 215                     errx (1, "der_get_general_string: %s",
 216                           error_message (ret));
 217                 s = str.data;
 218                 printf("\"");
 219                 for (n = 0; n < str.length; n++) {
 220                     if (isprint((int)s[n]))
 221                         printf ("%c", s[n]);
 222                     else
 223                         printf ("#%02x", s[n]);
 224                 }
 225                 printf("\"\n");
 226                 der_free_printable_string(&str);
 227                 break;
 228             }
 229             case UT_GeneralizedTime :
 230             case UT_GeneralString :
 231             case UT_VisibleString :
 232             case UT_UTF8String : {
 233                 heim_general_string str;
 234
 235                 ret = der_get_general_string (buf, length, &str, NULL);
 236                 if (ret)
 237                     errx (1, "der_get_general_string: %s",
 238                           error_message (ret));
 239                 printf ("\"%s\"\n", str);
 240                 free (str);
 241                 break;
 242             }
 243             case UT_OID: {
 244                 heim_oid o;
 245                 char *p;
 246
 247                 ret = der_get_oid(buf, length, &o, NULL);
 248                 if (ret)
 249                     errx (1, "der_get_oid: %s", error_message (ret));
 250                 ret = der_print_heim_oid(&o, '.', &p);
 251                 der_free_oid(&o);
 252                 if (ret)
 253                     errx (1, "der_print_heim_oid: %s", error_message (ret));
 254                 printf("%s\n", p);
 255                 free(p);
 256
 257                 break;
 258             }
 259             case UT_Enumerated: {
 260                 int num;
 261
 262                 ret = der_get_integer (buf, length, &num, NULL);
 263                 if (ret)
 264                     errx (1, "der_get_enum: %s", error_message (ret));
 265
 266                 printf("%u\n", num);
 267                 break;
 268             }
 269             default :
 270                 printf ("%lu bytes\n", (unsigned long)length);
 271                 break;
 272             }
 273         }
 274         if (end_tag) {
 275             if (loop_length == 0)
 276                 errx(1, "zero length INDEFINITE data ? indent = %d\n",
 277                      indent / 2);
 278             if (loop_length < length)
 279                 length = loop_length;
 280             if (indefinite_form_loop == 0)
 281                 errx(1, "internal error in indefinite form loop detection");
 282             indefinite_form_loop--;
 283         } else if (loop_length)
 284             errx(1, "internal error for INDEFINITE form");
 285         buf += length;
 286         len -= length;
 287     }
 288     return 0;
 289 }
 290
 291 static int
 292 doit (const char *filename)
 293 {
 294     int fd = open (filename, O_RDONLY);
 295     struct stat sb;
 296     unsigned char *buf;
 297     size_t len;
 298     int ret;
 299
 300     if(fd < 0)
 301         err (1, "opening %s for read", filename);
 302     if (fstat (fd, &sb) < 0)
 303         err (1, "stat %s", filename);
 304     len = sb.st_size;
 305     buf = emalloc (len);
 306     if (read (fd, buf, len) != len)
 307         errx (1, "read failed");
 308     close (fd);
 309     ret = loop (buf, len, 0);
 310     free (buf);
 311     return ret;
 312 }
 313
 314
 315 static int version_flag;
 316 static int help_flag;
 317 struct getargs args[] = {
 318     { "indent", 0, arg_negative_flag, &indent_flag },
 319     { "inner", 0, arg_flag, &inner_flag, "try to parse inner structures of OCTET STRING" },
 320     { "version", 0, arg_flag, &version_flag },
 321     { "help", 0, arg_flag, &help_flag }
 322 };
 323 int num_args = sizeof(args) / sizeof(args[0]);
 324
 325 static void
 326 usage(int code)
 327 {
 328     arg_printusage(args, num_args, NULL, "dump-file");
 329     exit(code);
 330 }
 331
 332 int
 333 main(int argc, char **argv)
 334 {
 335     int optidx = 0;
 336
 337     setprogname (argv[0]);
 338     initialize_asn1_error_table ();
 339     if(getarg(args, num_args, argc, argv, &optidx))
 340         usage(1);
 341     if(help_flag)
 342         usage(0);
 343     if(version_flag) {
 344         print_version(NULL);
 345         exit(0);
 346     }
 347     argv += optidx;
 348     argc -= optidx;
 349     if (argc != 1)
 350         usage (1);
 351     return doit (argv[0]);
 352 }