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 static char *cache_str;
  37 static char *out_cache_str;
  38 static char *delegation_cred_str;
  39 static char *etype_str;
  40 static int transit_flag = 1;
  41 static int forwardable_flag;
  42 static int canonicalize_flag;
  43 static int is_hostbased_flag;
  44 static int is_canonical_flag;
  45 static char *impersonate_str;
  46 static char *nametype_str;
  47 static int store_flag = 1;
  48 static int cached_only_flag;
  49 static int debug_flag;
  50 static int version_flag;
  51 static int help_flag;
  52
  53 struct getargs args[] = {
  54     { "cache",          'c', arg_string, &cache_str,
  55       NP_("credential cache to use", ""), "cache"},
  56     { "out-cache",      0,   arg_string, &out_cache_str,
  57       NP_("credential cache to store credential in", ""), "cache"},
  58     { "delegation-credential-cache",0,arg_string, &delegation_cred_str,
  59       NP_("where to find the ticket use for delegation", ""), "cache"},
  60     { "canonicalize",   0, arg_flag, &canonicalize_flag,
  61       NP_("canonicalize the principal (chase referrals)", ""), NULL },
  62     { "canonical",      0,   arg_flag, &is_canonical_flag,
  63       NP_("the name components are canonical", ""), NULL },
  64     { "forwardable",    0,   arg_flag, &forwardable_flag,
  65       NP_("forwardable ticket requested", ""), NULL},
  66     { "transit-check",  0,   arg_negative_flag, &transit_flag, NULL, NULL },
  67     { "enctype",        'e', arg_string, &etype_str,
  68       NP_("encryption type to use", ""), "enctype"},
  69     { "impersonate",    0,   arg_string, &impersonate_str,
  70       NP_("client to impersonate", ""), "principal"},
  71     { "name-type",      0,   arg_string, &nametype_str,
  72       NP_("Kerberos name type", ""), NULL },
  73     { "hostbased",      'H', arg_flag, &is_hostbased_flag,
  74       NP_("indicate that the name is a host-based service name", ""), NULL },
  75     { "store",          0,   arg_negative_flag, &store_flag,
  76       NP_("don't store the tickets obtained in the cache", ""), NULL },
  77     { "cached-only",            0,   arg_flag, &cached_only_flag,
  78       NP_("don't talk to the KDC, just search the cache", ""), NULL },
  79     { "debug",          0,   arg_flag, &debug_flag, NULL, NULL },
  80     { "version",        0,   arg_flag, &version_flag, NULL, NULL },
  81     { "help",           0,   arg_flag, &help_flag, NULL, NULL }
  82 };
  83
  84 static void
  85 usage(int ret)
  86 {
  87     arg_printusage(args,
  88                    sizeof(args)/sizeof(*args),
  89                    NULL,
  90                    "service");
  91     exit (ret);
  92 }
  93
  94 int
  95 main(int argc, char **argv)
  96 {
  97     krb5_error_code ret;
  98     krb5_context context;
  99     krb5_ccache cache;
 100     krb5_creds *out;
 101     int optidx = 0;
 102     int32_t nametype = KRB5_NT_UNKNOWN;
 103     krb5_get_creds_opt opt;
 104     krb5_principal server = NULL;
 105     krb5_principal impersonate;
 106
 107     setprogname(argv[0]);
 108
 109     ret = krb5_init_context(&context);
 110     if (ret)
 111         errx(1, "krb5_init_context failed: %d", ret);
 112
 113     if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 114         usage(1);
 115
 116     if (help_flag)
 117         usage (0);
 118
 119     if (version_flag) {
 120         print_version(NULL);
 121         exit(0);
 122     }
 123
 124     argc -= optidx;
 125     argv += optidx;
 126
 127     if (debug_flag) {
 128         ret = krb5_set_debug_dest(context, getprogname(), "STDERR");
 129         if (ret)
 130             krb5_warn(context, ret, "krb5_set_debug_dest");
 131     }
 132
 133     if (cache_str) {
 134         ret = krb5_cc_resolve(context, cache_str, &cache);
 135         if (ret)
 136             krb5_err(context, 1, ret, "%s", cache_str);
 137     } else {
 138         ret = krb5_cc_default (context, &cache);
 139         if (ret)
 140             krb5_err(context, 1, ret, "krb5_cc_resolve");
 141     }
 142
 143     ret = krb5_get_creds_opt_alloc(context, &opt);
 144     if (ret)
 145         krb5_err(context, 1, ret, "krb5_get_creds_opt_alloc");
 146
 147     if (etype_str) {
 148         krb5_enctype enctype;
 149
 150         ret = krb5_string_to_enctype(context, etype_str, &enctype);
 151         if (ret)
 152             krb5_errx(context, 1, N_("unrecognized enctype: %s", ""),
 153                       etype_str);
 154         krb5_get_creds_opt_set_enctype(context, opt, enctype);
 155     }
 156
 157     if (impersonate_str) {
 158         ret = krb5_parse_name(context, impersonate_str, &impersonate);
 159         if (ret)
 160             krb5_err(context, 1, ret, "krb5_parse_name %s", impersonate_str);
 161         krb5_get_creds_opt_set_impersonate(context, opt, impersonate);
 162         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 163         krb5_free_principal(context, impersonate);
 164     }
 165
 166     if (out_cache_str)
 167         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 168
 169     if (forwardable_flag)
 170         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
 171     if (!transit_flag)
 172         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_TRANSIT_CHECK);
 173     if (canonicalize_flag)
 174         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CANONICALIZE);
 175     if (!store_flag)
 176         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 177     if (cached_only_flag)
 178         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CACHED);
 179
 180     if (delegation_cred_str) {
 181         krb5_ccache id;
 182         krb5_creds c, mc;
 183         Ticket ticket;
 184
 185         krb5_cc_clear_mcred(&mc);
 186         ret = krb5_cc_get_principal(context, cache, &mc.server);
 187         if (ret)
 188             krb5_err(context, 1, ret, "krb5_cc_get_principal");
 189
 190         ret = krb5_cc_resolve(context, delegation_cred_str, &id);
 191         if(ret)
 192             krb5_err(context, 1, ret, "krb5_cc_resolve");
 193
 194         ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c);
 195         if(ret)
 196             krb5_err(context, 1, ret, "krb5_cc_retrieve_cred");
 197
 198         ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL);
 199         if (ret) {
 200             krb5_clear_error_message(context);
 201             krb5_err(context, 1, ret, "decode_Ticket");
 202         }
 203         krb5_free_cred_contents(context, &c);
 204
 205         ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket);
 206         if(ret)
 207             krb5_err(context, 1, ret, "krb5_get_creds_opt_set_ticket");
 208         free_Ticket(&ticket);
 209
 210         krb5_cc_close(context, id);
 211         krb5_free_principal(context, mc.server);
 212
 213         krb5_get_creds_opt_add_options(context, opt,
 214                                        KRB5_GC_CONSTRAINED_DELEGATION);
 215     }
 216
 217     if (nametype_str != NULL) {
 218         ret = krb5_parse_nametype(context, nametype_str, &nametype);
 219         if (ret)
 220             krb5_err(context, 1, ret, "krb5_parse_nametype");
 221     }
 222
 223     if (nametype == KRB5_NT_SRV_HST ||
 224         nametype == KRB5_NT_SRV_HST_NEEDS_CANON)
 225         is_hostbased_flag = 1;
 226
 227     if (is_hostbased_flag) {
 228         const char *sname = NULL;
 229         const char *hname = NULL;
 230
 231         if (nametype_str != NULL &&
 232             nametype != KRB5_NT_SRV_HST &&
 233             nametype != KRB5_NT_SRV_HST_NEEDS_CANON)
 234             krb5_errx(context, 1, "--hostbased not compatible with "
 235                       "non-hostbased --name-type");
 236
 237         if (is_canonical_flag)
 238             nametype = KRB5_NT_SRV_HST;
 239         else
 240             nametype = KRB5_NT_SRV_HST_NEEDS_CANON;
 241
 242         /*
 243          * Host-based service names can have more than one component.
 244          *
 245          * RFC5179 did not, but should have, assign a Kerberos name-type
 246          * corresponding to GSS_C_NT_DOMAINBASED.  But it's basically a
 247          * host-based service name type with one additional component.
 248          *
 249          * So that's how we're treating host-based service names here:
 250          * two or more components.
 251          */
 252
 253         if (argc == 0) {
 254             usage(1);
 255         } else if (argc == 1) {
 256             krb5_principal server2;
 257
 258             /*
 259              * In this case the one argument is a principal name, not the
 260              * service name.
 261              *
 262              * We parse the argument as a principal name, extract the service
 263              * and hostname components, use krb5_sname_to_principal(), then
 264              * extract the service and hostname components from that.
 265              */
 266
 267             ret = krb5_parse_name(context, argv[0], &server);
 268             if (ret)
 269                 krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]);
 270             sname = krb5_principal_get_comp_string(context, server, 0);
 271
 272             /*
 273              * If a single-component principal name is given, then we'll
 274              * default the hostname, as krb5_principal_get_comp_string()
 275              * returns NULL in this case.
 276              */
 277             hname = krb5_principal_get_comp_string(context, server, 1);
 278
 279             ret = krb5_sname_to_principal(context, hname, sname,
 280                                            KRB5_NT_SRV_HST, &server2);
 281             sname = krb5_principal_get_comp_string(context, server2, 0);
 282             hname = krb5_principal_get_comp_string(context, server2, 1);
 283
 284             /*
 285              * Modify the original with the new sname/hname.  This way we
 286              * retain any additional principal name components from the given
 287              * principal name.
 288              *
 289              * The name-type is set further below.
 290              */
 291             ret = krb5_principal_set_comp_string(context, server, 0, sname);
 292             if (ret)
 293                 krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]);
 294             ret = krb5_principal_set_comp_string(context, server, 1, hname);
 295             if (ret)
 296                 krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]);
 297             krb5_free_principal(context, server2);
 298         } else {
 299             size_t i;
 300
 301             /*
 302              * In this case the arguments are principal name components.
 303              *
 304              * The service and hostname components can be defaulted by passing
 305              * empty strings.
 306              */
 307             sname = argv[0];
 308             if (*sname == '\0')
 309                 sname = NULL;
 310             hname = argv[1];
 311             if (hname == NULL || *hname == '\0')
 312                 hname = NULL;
 313             ret = krb5_sname_to_principal(context, hname, sname,
 314                                           KRB5_NT_SRV_HST, &server);
 315             if (ret)
 316                 krb5_err(context, 1, ret, "krb5_sname_to_principal");
 317
 318             for (i = 2; i < argc; i++) {
 319                 ret = krb5_principal_set_comp_string(context, server, i, argv[i]);
 320                 if (ret)
 321                     krb5_err(context, 1, ret, "krb5_principal_set_comp_string");
 322             }
 323         }
 324     } else if (argc == 1) {
 325         ret = krb5_parse_name(context, argv[0], &server);
 326         if (ret)
 327             krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]);
 328     } else {
 329         usage(1);
 330     }
 331
 332     if (nametype != KRB5_NT_UNKNOWN)
 333         server->name.name_type = (NAME_TYPE)nametype;
 334
 335     ret = krb5_get_creds(context, opt, cache, server, &out);
 336     if (ret)
 337         krb5_err(context, 1, ret, "krb5_get_creds");
 338
 339     if (out_cache_str) {
 340         krb5_ccache id;
 341
 342         ret = krb5_cc_resolve(context, out_cache_str, &id);
 343         if(ret)
 344             krb5_err(context, 1, ret, "krb5_cc_resolve");
 345
 346         ret = krb5_cc_initialize(context, id, out->client);
 347         if(ret)
 348             krb5_err(context, 1, ret, "krb5_cc_initialize");
 349
 350         ret = krb5_cc_store_cred(context, id, out);
 351         if(ret)
 352             krb5_err(context, 1, ret, "krb5_cc_store_cred");
 353         krb5_cc_close(context, id);
 354     }
 355
 356     krb5_free_creds(context, out);
 357     krb5_free_principal(context, server);
 358     krb5_get_creds_opt_free(context, opt);
 359     krb5_cc_close (context, cache);
 360     krb5_free_context (context);
 361
 362     return 0;
 363 }