kuser/kdecode_ticket.c

   1 /*
   2  * Copyright (c) 1997 - 2004 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 "kuser_locl.h"
  35
  36 static char *etype_str;
  37 static int version_flag;
  38 static int help_flag;
  39
  40 static void
  41 print_and_decode_tkt (krb5_context context,
  42                       krb5_data *ticket,
  43                       krb5_principal server,
  44                       krb5_enctype enctype)
  45 {
  46     krb5_error_code ret;
  47     krb5_crypto crypto;
  48     krb5_data dec_data;
  49     size_t len;
  50     EncTicketPart decr_part;
  51     krb5_keyblock key;
  52     Ticket tkt;
  53
  54     ret = decode_Ticket (ticket->data, ticket->length, &tkt, &len);
  55     if (ret)
  56         krb5_err (context, 1, ret, "decode_Ticket");
  57
  58     ret = krb5_string_to_key (context, enctype, "foo", server, &key);
  59     if (ret)
  60         krb5_err (context, 1, ret, "krb5_string_to_key");
  61
  62     ret = krb5_crypto_init(context, &key, 0, &crypto);
  63     if (ret)
  64         krb5_err (context, 1, ret, "krb5_crypto_init");
  65
  66     ret = krb5_decrypt_EncryptedData (context, crypto, KRB5_KU_TICKET,
  67                                       &tkt.enc_part, &dec_data);
  68     krb5_crypto_destroy (context, crypto);
  69     if (ret)
  70         krb5_err (context, 1, ret, "krb5_decrypt_EncryptedData");
  71     ret = decode_EncTicketPart (dec_data.data, dec_data.length,
  72                                 &decr_part, &len);
  73     krb5_data_free (&dec_data);
  74     if (ret)
  75         krb5_err (context, 1, ret, "krb5_decode_EncTicketPart");
  76     free_EncTicketPart(&decr_part);
  77 }
  78
  79 struct getargs args[] = {
  80     { "enctype",        'e', arg_string, &etype_str,
  81       "encryption type to use", "enctype"},
  82     { "version",        0,   arg_flag, &version_flag, NULL, NULL },
  83     { "help",           0,   arg_flag, &help_flag, NULL, NULL }
  84 };
  85
  86 static void
  87 usage (int ret)
  88 {
  89     arg_printusage (args,
  90                     sizeof(args)/sizeof(*args),
  91                     NULL,
  92                     "service");
  93     exit (ret);
  94 }
  95
  96 int
  97 main(int argc, char **argv)
  98 {
  99     krb5_error_code ret;
 100     krb5_context context;
 101     krb5_ccache cache;
 102     krb5_creds in, *out;
 103     int optidx = 0;
 104
 105     setprogname (argv[0]);
 106
 107     ret = krb5_init_context (&context);
 108     if (ret)
 109         errx(1, "krb5_init_context failed: %d", ret);
 110
 111     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 112         usage(1);
 113
 114     if (help_flag)
 115         usage (0);
 116
 117     if(version_flag) {
 118         print_version(NULL);
 119         exit(0);
 120     }
 121
 122     argc -= optidx;
 123     argv += optidx;
 124
 125     if (argc != 1)
 126         usage (1);
 127
 128     ret = krb5_cc_default(context, &cache);
 129     if (ret)
 130         krb5_err (context, 1, ret, "krb5_cc_default");
 131
 132     memset(&in, 0, sizeof(in));
 133
 134     if (etype_str) {
 135         krb5_enctype enctype;
 136
 137         ret = krb5_string_to_enctype(context, etype_str, &enctype);
 138         if (ret)
 139             krb5_errx (context, 1, "unrecognized enctype: %s", etype_str);
 140         in.session.keytype = enctype;
 141     }
 142
 143     ret = krb5_cc_get_principal(context, cache, &in.client);
 144     if (ret)
 145         krb5_err (context, 1, ret, "krb5_cc_get_principal");
 146
 147     ret = krb5_parse_name(context, argv[0], &in.server);
 148     if (ret)
 149         krb5_err (context, 1, ret, "krb5_parse_name %s", argv[0]);
 150
 151     in.times.endtime = 0;
 152     ret = krb5_get_credentials(context, 0, cache, &in, &out);
 153     if (ret)
 154         krb5_err (context, 1, ret, "krb5_get_credentials");
 155
 156     print_and_decode_tkt (context, &out->ticket, out->server,
 157                           out->session.keytype);
 158
 159     krb5_free_cred_contents(context, out);
 160     return 0;
 161 }