krb5dissect.c

   1 /* krb5dissect.c --- Dissect Kerberos ccache/keytab files.
   2  * Copyright (C) 2007 Simon Josefsson.
   3  *
   4  * This file is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2, or (at your option)
   7  * any later version.
   8  *
   9  * This file is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this file; see the file COPYING.  If not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 /* Autoconf definitions. */
  21 #include <config.h>
  22
  23 /* Standard headers. */
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28
  29 /* Gnulib headers. */
  30 #include "progname.h"
  31 #include "version-etc.h"
  32 #include "read-file.h"
  33 #include "error.h"
  34 #include "xvasprintf.h"
  35
  36 /* Our headers. */
  37 #include "ccache.h"
  38 #include "keytab.h"
  39 #include "krb5dissect_cmd.h"
  40
  41 const char version_etc_copyright[] = "Copyright %s %d Simon Josefsson.";
  42
  43 void
  44 parse_ccache (const char *data, size_t len)
  45 {
  46   struct ccache ccache;
  47   struct ccache_credential cred;
  48   int rc;
  49   size_t i = 0;
  50
  51   rc = ccache_parse (data, len, &ccache);
  52   if (rc < 0)
  53     error (EXIT_FAILURE, 0, "Cannot parse ccache");
  54
  55   ccache_print (&ccache);
  56
  57   while (ccache.credentialslen)
  58     {
  59       size_t n;
  60
  61       rc = ccache_parse_credential (ccache.credentials,
  62                                     ccache.credentialslen, &cred, &n);
  63       if (rc < 0)
  64         error (EXIT_FAILURE, 0, "Cannot parse ccache entry %d", i);
  65
  66       printf ("\nCcache entry %d:\n", i++);
  67
  68       ccache_print_credential (&cred);
  69
  70       ccache.credentials += n;
  71       ccache.credentialslen -= n;
  72     }
  73 }
  74
  75 void
  76 parse_keytab (const char *data, size_t len)
  77 {
  78   struct keytab keytab;
  79   struct keytab_entry entry;
  80   int rc;
  81   size_t i = 0;
  82
  83   rc = keytab_parse (data, len, &keytab);
  84   if (rc < 0)
  85     error (EXIT_FAILURE, 0, "Cannot parse keytab");
  86
  87   keytab_print (&keytab);
  88
  89   while (keytab.keytabslen)
  90     {
  91       size_t n;
  92
  93       rc = keytab_parse_entry (keytab.keytabs,
  94                                keytab.keytabslen, &entry, &n);
  95       if (rc < 0)
  96         error (EXIT_FAILURE, 0, "Cannot parse keytab entry %d", i);
  97
  98       printf ("\nKeytab entry %d:\n", i++);
  99
 100       keytab_print_entry (&entry);
 101
 102       keytab.keytabs += n;
 103       keytab.keytabslen -= n;
 104     }
 105 }
 106
 107 int
 108 main (int argc, char *argv[])
 109 {
 110   struct gengetopt_args_info args_info;
 111   int free_filename = 0;
 112   char *filename;
 113   size_t len;
 114   char *data;
 115
 116   set_program_name (argv[0]);
 117
 118   if (cmdline_parser (argc, argv, &args_info) != 0)
 119     return EXIT_FAILURE;
 120
 121   if (!args_info.quiet_given)
 122     {
 123       version_etc (stdout, program_name, PACKAGE, VERSION,
 124                    "Simon Josefsson", (char*) NULL);
 125       puts("");
 126     }
 127
 128   if (args_info.keytab_given)
 129     filename = "/etc/krb5.keytab";
 130   else if (args_info.ccache_given)
 131     {
 132       filename = xasprintf("/tmp/krb5cc_%u", (unsigned long) getuid ());
 133       free_filename = 1;
 134     }
 135   else if (args_info.inputs_num == 1)
 136     filename = args_info.inputs[0];
 137   else
 138     {
 139       cmdline_parser_print_help ();
 140       return EXIT_FAILURE;
 141     }
 142
 143   cmdline_parser_free (&args_info);
 144
 145   if (strcmp (filename, "-") == 0)
 146     data = fread_file (stdin, &len);
 147   else
 148     data = read_binary_file (filename, &len);
 149   if (!data)
 150     error (EXIT_FAILURE, errno, "%s", filename);
 151
 152   if (free_filename)
 153     free (filename);
 154
 155   if (len > 2 && data[0] == '\x05' && data[1] == '\x04')
 156     parse_ccache (data, len);
 157   else
 158     parse_keytab (data, len);
 159
 160   free (data);
 161
 162   return 0;
 163 }