kuser/kgetcred.c

   1 /*
   2  * Copyright (c) 1997 - 2008 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 int canonicalize_flag;
  45 static char *impersonate_str;
  46 static char *nametype_str;
  47 static int version_flag;
  48 static int help_flag;
  49
  50 struct getargs args[] = {
  51     { "cache",          'c', arg_string, &cache_str,
  52       "credential cache to use", "cache"},
  53     { "out-cache",      0,   arg_string, &out_cache_str,
  54       "credential cache to store credential in", "cache"},
  55     { "delegation-credential-cache",0,arg_string, &delegation_cred_str,
  56       "where to find the ticket use for delegation", "cache"},
  57     { "canonicalize",   0, arg_flag, &canonicalize_flag,
  58       "canonicalize the principal"},
  59     { "forwardable",    0, arg_flag, &forwardable_flag,
  60       "forwardable ticket requested"},
  61     { "transit-check",  0,   arg_negative_flag, &transit_flag },
  62     { "enctype",        'e', arg_string, &etype_str,
  63       "encryption type to use", "enctype"},
  64     { "impersonate",    0,   arg_string, &impersonate_str,
  65       "client to impersonate", "principal"},
  66     { "name-type",              0,   arg_string, &nametype_str },
  67     { "version",        0,   arg_flag, &version_flag },
  68     { "help",           0,   arg_flag, &help_flag }
  69 };
  70
  71 static void
  72 usage (int ret)
  73 {
  74     arg_printusage (args,
  75                     sizeof(args)/sizeof(*args),
  76                     NULL,
  77                     "service");
  78     exit (ret);
  79 }
  80
  81 int
  82 main(int argc, char **argv)
  83 {
  84     krb5_error_code ret;
  85     krb5_context context;
  86     krb5_ccache cache;
  87     krb5_creds *out;
  88     int optidx = 0;
  89     krb5_get_creds_opt opt;
  90     krb5_principal server;
  91     krb5_principal impersonate = NULL;
  92
  93     setprogname (argv[0]);
  94
  95     ret = krb5_init_context (&context);
  96     if (ret)
  97         errx(1, "krb5_init_context failed: %d", ret);
  98
  99     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 100         usage(1);
 101
 102     if (help_flag)
 103         usage (0);
 104
 105     if(version_flag) {
 106         print_version(NULL);
 107         exit(0);
 108     }
 109
 110     argc -= optidx;
 111     argv += optidx;
 112
 113     if (argc != 1)
 114         usage (1);
 115
 116     if(cache_str) {
 117         ret = krb5_cc_resolve(context, cache_str, &cache);
 118         if (ret)
 119             krb5_err (context, 1, ret, "%s", cache_str);
 120     } else {
 121         ret = krb5_cc_default (context, &cache);
 122         if (ret)
 123             krb5_err (context, 1, ret, "krb5_cc_resolve");
 124     }
 125
 126     ret = krb5_get_creds_opt_alloc(context, &opt);
 127     if (ret)
 128         krb5_err (context, 1, ret, "krb5_get_creds_opt_alloc");
 129
 130     if (etype_str) {
 131         krb5_enctype enctype;
 132
 133         ret = krb5_string_to_enctype(context, etype_str, &enctype);
 134         if (ret)
 135             krb5_errx (context, 1, "unrecognized enctype: %s", etype_str);
 136         krb5_get_creds_opt_set_enctype(context, opt, enctype);
 137     }
 138
 139     if (impersonate_str) {
 140         ret = krb5_parse_name(context, impersonate_str, &impersonate);
 141         if (ret)
 142             krb5_err (context, 1, ret, "krb5_parse_name %s", impersonate_str);
 143         krb5_get_creds_opt_set_impersonate(context, opt, impersonate);
 144         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 145     }
 146
 147     if (out_cache_str)
 148         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 149
 150     if (forwardable_flag)
 151         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
 152     if (!transit_flag)
 153         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_TRANSIT_CHECK);
 154     if (canonicalize_flag)
 155         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CANONICALIZE);
 156
 157     if (delegation_cred_str) {
 158         krb5_ccache id;
 159         krb5_creds c, mc;
 160         Ticket ticket;
 161
 162         krb5_cc_clear_mcred(&mc);
 163         ret = krb5_cc_get_principal(context, cache, &mc.server);
 164         if (ret)
 165             krb5_err (context, 1, ret, "krb5_cc_get_principal");
 166
 167         ret = krb5_cc_resolve(context, delegation_cred_str, &id);
 168         if(ret)
 169             krb5_err (context, 1, ret, "krb5_cc_resolve");
 170
 171         ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c);
 172         if(ret)
 173             krb5_err (context, 1, ret, "krb5_cc_retrieve_cred");
 174
 175         ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL);
 176         if (ret) {
 177             krb5_clear_error_string(context);
 178             krb5_err (context, 1, ret, "decode_Ticket");
 179         }
 180         krb5_free_cred_contents(context, &c);
 181
 182         ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket);
 183         if(ret)
 184             krb5_err (context, 1, ret, "krb5_get_creds_opt_set_ticket");
 185         free_Ticket(&ticket);
 186
 187         krb5_cc_close (context, id);
 188         krb5_free_principal(context, mc.server);
 189
 190         krb5_get_creds_opt_add_options(context, opt,
 191                                        KRB5_GC_CONSTRAINED_DELEGATION);
 192     }
 193
 194     ret = krb5_parse_name(context, argv[0], &server);
 195     if (ret)
 196         krb5_err (context, 1, ret, "krb5_parse_name %s", argv[0]);
 197
 198     if (nametype_str) {
 199         ret = krb5_parse_nametype(context, nametype_str,
 200                                   &server->name.name_type);
 201         if (ret)
 202             krb5_err(context, 1, ret, "krb5_parse_nametype");
 203     }
 204
 205     ret = krb5_get_creds(context, opt, cache, server, &out);
 206     if (ret)
 207         krb5_err (context, 1, ret, "krb5_get_creds");
 208
 209     if (out_cache_str) {
 210         krb5_ccache id;
 211
 212         ret = krb5_cc_resolve(context, out_cache_str, &id);
 213         if(ret)
 214             krb5_err (context, 1, ret, "krb5_cc_resolve");
 215
 216         ret = krb5_cc_initialize(context, id, out->client);
 217         if(ret)
 218             krb5_err (context, 1, ret, "krb5_cc_initialize");
 219
 220         ret = krb5_cc_store_cred(context, id, out);
 221         if(ret)
 222             krb5_err (context, 1, ret, "krb5_cc_store_cred");
 223         krb5_cc_close (context, id);
 224     }
 225
 226     krb5_free_creds(context, out);
 227     krb5_free_principal(context, server);
 228     krb5_get_creds_opt_free(context, opt);
 229     krb5_cc_close (context, cache);
 230     krb5_free_context (context);
 231
 232     return 0;
 233 }