kuser/kgetcred.c

   1 /*
   2  * Copyright (c) 1997 - 2007 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 RCSID("$Id$");
  37
  38 static char *cache_str;
  39 static char *out_cache_str;
  40 static char *delegation_cred_str;
  41 static char *etype_str;
  42 static int transit_flag = 1;
  43 static int forwardable_flag;
  44 static char *impersonate_str;
  45 static char *nametype_str;
  46 static int version_flag;
  47 static int help_flag;
  48
  49 struct getargs args[] = {
  50     { "cache",          'c', arg_string, &cache_str,
  51       "credential cache to use", "cache"},
  52     { "out-cache",      0,   arg_string, &out_cache_str,
  53       "credential cache to store credential in", "cache"},
  54     { "delegation-credential-cache",0,arg_string, &delegation_cred_str,
  55       "where to find the ticket use for delegation", "cache"},
  56     { "forwardable",    0, arg_flag, &forwardable_flag,
  57       "forwardable ticket requested"},
  58     { "transit-check",  0,   arg_negative_flag, &transit_flag },
  59     { "enctype",        'e', arg_string, &etype_str,
  60       "encryption type to use", "enctype"},
  61     { "impersonate",    0,   arg_string, &impersonate_str,
  62       "client to impersonate", "principal"},
  63     { "name-type",              0,   arg_string, &nametype_str },
  64     { "version",        0,   arg_flag, &version_flag },
  65     { "help",           0,   arg_flag, &help_flag }
  66 };
  67
  68 static void
  69 usage (int ret)
  70 {
  71     arg_printusage (args,
  72                     sizeof(args)/sizeof(*args),
  73                     NULL,
  74                     "service");
  75     exit (ret);
  76 }
  77
  78 int
  79 main(int argc, char **argv)
  80 {
  81     krb5_error_code ret;
  82     krb5_context context;
  83     krb5_ccache cache;
  84     krb5_creds *out;
  85     int optidx = 0;
  86     krb5_get_creds_opt opt;
  87     krb5_principal server;
  88     krb5_principal impersonate = NULL;
  89
  90     setprogname (argv[0]);
  91
  92     ret = krb5_init_context (&context);
  93     if (ret)
  94         errx(1, "krb5_init_context failed: %d", ret);
  95
  96     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
  97         usage(1);
  98
  99     if (help_flag)
 100         usage (0);
 101
 102     if(version_flag) {
 103         print_version(NULL);
 104         exit(0);
 105     }
 106
 107     argc -= optidx;
 108     argv += optidx;
 109
 110     if (argc != 1)
 111         usage (1);
 112
 113     if(cache_str) {
 114         ret = krb5_cc_resolve(context, cache_str, &cache);
 115         if (ret)
 116             krb5_err (context, 1, ret, "%s", cache_str);
 117     } else {
 118         ret = krb5_cc_default (context, &cache);
 119         if (ret)
 120             krb5_err (context, 1, ret, "krb5_cc_resolve");
 121     }
 122
 123     ret = krb5_get_creds_opt_alloc(context, &opt);
 124     if (ret)
 125         krb5_err (context, 1, ret, "krb5_get_creds_opt_alloc");
 126
 127     if (etype_str) {
 128         krb5_enctype enctype;
 129
 130         ret = krb5_string_to_enctype(context, etype_str, &enctype);
 131         if (ret)
 132             krb5_errx (context, 1, "unrecognized enctype: %s", etype_str);
 133         krb5_get_creds_opt_set_enctype(context, opt, enctype);
 134     }
 135
 136     if (impersonate_str) {
 137         ret = krb5_parse_name(context, impersonate_str, &impersonate);
 138         if (ret)
 139             krb5_err (context, 1, ret, "krb5_parse_name %s", impersonate_str);
 140         krb5_get_creds_opt_set_impersonate(context, opt, impersonate);
 141         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 142     }
 143
 144     if (out_cache_str)
 145         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 146
 147     if (forwardable_flag)
 148         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
 149     if (!transit_flag)
 150         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_TRANSIT_CHECK);
 151
 152     if (delegation_cred_str) {
 153         krb5_ccache id;
 154         krb5_creds c, mc;
 155         Ticket ticket;
 156
 157         krb5_cc_clear_mcred(&mc);
 158         ret = krb5_cc_get_principal(context, cache, &mc.server);
 159         if (ret)
 160             krb5_err (context, 1, ret, "krb5_cc_get_principal");
 161
 162         ret = krb5_cc_resolve(context, delegation_cred_str, &id);
 163         if(ret)
 164             krb5_err (context, 1, ret, "krb5_cc_resolve");
 165
 166         ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c);
 167         if(ret)
 168             krb5_err (context, 1, ret, "krb5_cc_retrieve_cred");
 169
 170         ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL);
 171         if (ret) {
 172             krb5_clear_error_string(context);
 173             krb5_err (context, 1, ret, "decode_Ticket");
 174         }
 175         krb5_free_cred_contents(context, &c);
 176
 177         ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket);
 178         if(ret)
 179             krb5_err (context, 1, ret, "krb5_get_creds_opt_set_ticket");
 180         free_Ticket(&ticket);
 181
 182         krb5_cc_close (context, id);
 183         krb5_free_principal(context, mc.server);
 184
 185         krb5_get_creds_opt_add_options(context, opt,
 186                                        KRB5_GC_CONSTRAINED_DELEGATION);
 187     }
 188
 189     ret = krb5_parse_name(context, argv[0], &server);
 190     if (ret)
 191         krb5_err (context, 1, ret, "krb5_parse_name %s", argv[0]);
 192
 193     if (nametype_str) {
 194         ret = krb5_parse_nametype(context, nametype_str,
 195                                   &server->name.name_type);
 196         if (ret)
 197             krb5_err(context, 1, ret, "krb5_parse_nametype");
 198     }
 199
 200     ret = krb5_get_creds(context, opt, cache, server, &out);
 201     if (ret)
 202         krb5_err (context, 1, ret, "krb5_get_creds");
 203
 204     if (out_cache_str) {
 205         krb5_ccache id;
 206
 207         ret = krb5_cc_resolve(context, out_cache_str, &id);
 208         if(ret)
 209             krb5_err (context, 1, ret, "krb5_cc_resolve");
 210
 211         ret = krb5_cc_initialize(context, id, out->client);
 212         if(ret)
 213             krb5_err (context, 1, ret, "krb5_cc_initialize");
 214
 215         ret = krb5_cc_store_cred(context, id, out);
 216         if(ret)
 217             krb5_err (context, 1, ret, "krb5_cc_store_cred");
 218         krb5_cc_close (context, id);
 219     }
 220
 221     krb5_free_creds(context, out);
 222     krb5_free_principal(context, server);
 223     krb5_get_creds_opt_free(context, opt);
 224     krb5_cc_close (context, cache);
 225     krb5_free_context (context);
 226
 227     return 0;
 228 }