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 anonymous_flag;
  50 static int debug_flag;
  51 static int version_flag;
  52 static int help_flag;
  53
  54 struct getargs args[] = {
  55     { "cache",          'c', arg_string, &cache_str,
  56       NP_("credential cache to use", ""), "cache"},
  57     { "out-cache",      0,   arg_string, &out_cache_str,
  58       NP_("credential cache to store credential in", ""), "cache"},
  59     { "delegation-credential-cache",0,arg_string, &delegation_cred_str,
  60       NP_("where to find the ticket use for delegation", ""), "cache"},
  61     { "canonicalize",   0, arg_flag, &canonicalize_flag,
  62       NP_("canonicalize the principal (chase referrals)", ""), NULL },
  63     { "canonical",      0,   arg_flag, &is_canonical_flag,
  64       NP_("the name components are canonical", ""), NULL },
  65     { "forwardable",    0,   arg_flag, &forwardable_flag,
  66       NP_("forwardable ticket requested", ""), NULL},
  67     { "transit-check",  0,   arg_negative_flag, &transit_flag, NULL, NULL },
  68     { "enctype",        'e', arg_string, &etype_str,
  69       NP_("encryption type to use", ""), "enctype"},
  70     { "impersonate",    0,   arg_string, &impersonate_str,
  71       NP_("client to impersonate", ""), "principal"},
  72     { "name-type",      0,   arg_string, &nametype_str,
  73       NP_("Kerberos name type", ""), NULL },
  74     { "hostbased",      'H', arg_flag, &is_hostbased_flag,
  75       NP_("indicate that the name is a host-based service name", ""), NULL },
  76     { "store",          0,   arg_negative_flag, &store_flag,
  77       NP_("don't store the tickets obtained in the cache", ""), NULL },
  78     { "cached-only",            0,   arg_flag, &cached_only_flag,
  79       NP_("don't talk to the KDC, just search the cache", ""), NULL },
  80     { "anonymous",      'n',   arg_flag, &anonymous_flag,
  81       NP_("request an anonymous ticket", ""), NULL },
  82     { "debug",          0,   arg_flag, &debug_flag, NULL, NULL },
  83     { "version",        0,   arg_flag, &version_flag, NULL, NULL },
  84     { "help",           0,   arg_flag, &help_flag, NULL, NULL }
  85 };
  86
  87 static void
  88 usage(int ret)
  89 {
  90     arg_printusage(args,
  91                    sizeof(args)/sizeof(*args),
  92                    NULL,
  93                    "service");
  94     exit (ret);
  95 }
  96
  97 int
  98 main(int argc, char **argv)
  99 {
 100     krb5_error_code ret;
 101     krb5_context context;
 102     krb5_ccache cache;
 103     krb5_creds *out;
 104     int optidx = 0;
 105     int32_t nametype = KRB5_NT_UNKNOWN;
 106     krb5_get_creds_opt opt;
 107     krb5_principal server = NULL;
 108     krb5_principal impersonate;
 109
 110     setprogname(argv[0]);
 111
 112     ret = krb5_init_context(&context);
 113     if (ret)
 114         errx(1, "krb5_init_context failed: %d", ret);
 115
 116     if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 117         usage(1);
 118
 119     if (help_flag)
 120         usage (0);
 121
 122     if (version_flag) {
 123         print_version(NULL);
 124         exit(0);
 125     }
 126
 127     argc -= optidx;
 128     argv += optidx;
 129
 130     if (debug_flag) {
 131         ret = krb5_set_debug_dest(context, getprogname(), "STDERR");
 132         if (ret)
 133             krb5_warn(context, ret, "krb5_set_debug_dest");
 134     }
 135
 136     if (cache_str) {
 137         ret = krb5_cc_resolve(context, cache_str, &cache);
 138         if (ret)
 139             krb5_err(context, 1, ret, "%s", cache_str);
 140     } else {
 141         ret = krb5_cc_default (context, &cache);
 142         if (ret)
 143             krb5_err(context, 1, ret, "krb5_cc_resolve");
 144     }
 145
 146     ret = krb5_get_creds_opt_alloc(context, &opt);
 147     if (ret)
 148         krb5_err(context, 1, ret, "krb5_get_creds_opt_alloc");
 149
 150     if (etype_str) {
 151         krb5_enctype enctype;
 152
 153         ret = krb5_string_to_enctype(context, etype_str, &enctype);
 154         if (ret)
 155             krb5_errx(context, 1, N_("unrecognized enctype: %s", ""),
 156                       etype_str);
 157         krb5_get_creds_opt_set_enctype(context, opt, enctype);
 158     }
 159
 160     if (impersonate_str) {
 161         ret = krb5_parse_name(context, impersonate_str, &impersonate);
 162         if (ret)
 163             krb5_err(context, 1, ret, "krb5_parse_name %s", impersonate_str);
 164         krb5_get_creds_opt_set_impersonate(context, opt, impersonate);
 165         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 166         krb5_free_principal(context, impersonate);
 167     }
 168
 169     if (out_cache_str)
 170         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 171
 172     if (forwardable_flag)
 173         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
 174     if (!transit_flag)
 175         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_TRANSIT_CHECK);
 176     if (canonicalize_flag)
 177         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CANONICALIZE);
 178     if (!store_flag)
 179         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 180     if (cached_only_flag)
 181         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CACHED);
 182     if (anonymous_flag)
 183         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_ANONYMOUS);
 184
 185     if (delegation_cred_str) {
 186         krb5_ccache id;
 187         krb5_creds c, mc;
 188         Ticket ticket;
 189
 190         krb5_cc_clear_mcred(&mc);
 191         ret = krb5_cc_get_principal(context, cache, &mc.server);
 192         if (ret)
 193             krb5_err(context, 1, ret, "krb5_cc_get_principal");
 194
 195         ret = krb5_cc_resolve(context, delegation_cred_str, &id);
 196         if(ret)
 197             krb5_err(context, 1, ret, "krb5_cc_resolve");
 198
 199         ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c);
 200         if(ret)
 201             krb5_err(context, 1, ret, "krb5_cc_retrieve_cred");
 202
 203         ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL);
 204         if (ret) {
 205             krb5_clear_error_message(context);
 206             krb5_err(context, 1, ret, "decode_Ticket");
 207         }
 208         krb5_free_cred_contents(context, &c);
 209
 210         ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket);
 211         if(ret)
 212             krb5_err(context, 1, ret, "krb5_get_creds_opt_set_ticket");
 213         free_Ticket(&ticket);
 214
 215         krb5_cc_close(context, id);
 216         krb5_free_principal(context, mc.server);
 217
 218         krb5_get_creds_opt_add_options(context, opt,
 219                                        KRB5_GC_CONSTRAINED_DELEGATION);
 220     }
 221
 222     if (nametype_str != NULL) {
 223         ret = krb5_parse_nametype(context, nametype_str, &nametype);
 224         if (ret)
 225             krb5_err(context, 1, ret, "krb5_parse_nametype");
 226     }
 227
 228     if (nametype == KRB5_NT_SRV_HST ||
 229         nametype == KRB5_NT_SRV_HST_NEEDS_CANON)
 230         is_hostbased_flag = 1;
 231
 232     if (is_hostbased_flag) {
 233         const char *sname = NULL;
 234         const char *hname = NULL;
 235
 236         if (nametype_str != NULL &&
 237             nametype != KRB5_NT_SRV_HST &&
 238             nametype != KRB5_NT_SRV_HST_NEEDS_CANON)
 239             krb5_errx(context, 1, "--hostbased not compatible with "
 240                       "non-hostbased --name-type");
 241
 242         if (is_canonical_flag)
 243             nametype = KRB5_NT_SRV_HST;
 244         else
 245             nametype = KRB5_NT_SRV_HST_NEEDS_CANON;
 246
 247         /*
 248          * Host-based service names can have more than one component.
 249          *
 250          * RFC5179 did not, but should have, assign a Kerberos name-type
 251          * corresponding to GSS_C_NT_DOMAINBASED.  But it's basically a
 252          * host-based service name type with one additional component.
 253          *
 254          * So that's how we're treating host-based service names here:
 255          * two or more components.
 256          */
 257
 258         if (argc == 0) {
 259             usage(1);
 260         } else if (argc == 1) {
 261             krb5_principal server2;
 262
 263             /*
 264              * In this case the one argument is a principal name, not the
 265              * service name.
 266              *
 267              * We parse the argument as a principal name, extract the service
 268              * and hostname components, use krb5_sname_to_principal(), then
 269              * extract the service and hostname components from that.
 270              */
 271
 272             ret = krb5_parse_name(context, argv[0], &server);
 273             if (ret)
 274                 krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]);
 275             sname = krb5_principal_get_comp_string(context, server, 0);
 276
 277             /*
 278              * If a single-component principal name is given, then we'll
 279              * default the hostname, as krb5_principal_get_comp_string()
 280              * returns NULL in this case.
 281              */
 282             hname = krb5_principal_get_comp_string(context, server, 1);
 283
 284             ret = krb5_sname_to_principal(context, hname, sname,
 285                                            KRB5_NT_SRV_HST, &server2);
 286             sname = krb5_principal_get_comp_string(context, server2, 0);
 287             hname = krb5_principal_get_comp_string(context, server2, 1);
 288
 289             /*
 290              * Modify the original with the new sname/hname.  This way we
 291              * retain any additional principal name components from the given
 292              * principal name.
 293              *
 294              * The name-type is set further below.
 295              */
 296             ret = krb5_principal_set_comp_string(context, server, 0, sname);
 297             if (ret)
 298                 krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]);
 299             ret = krb5_principal_set_comp_string(context, server, 1, hname);
 300             if (ret)
 301                 krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]);
 302             krb5_free_principal(context, server2);
 303         } else {
 304             size_t i;
 305
 306             /*
 307              * In this case the arguments are principal name components.
 308              *
 309              * The service and hostname components can be defaulted by passing
 310              * empty strings.
 311              */
 312             sname = argv[0];
 313             if (*sname == '\0')
 314                 sname = NULL;
 315             hname = argv[1];
 316             if (hname == NULL || *hname == '\0')
 317                 hname = NULL;
 318             ret = krb5_sname_to_principal(context, hname, sname,
 319                                           KRB5_NT_SRV_HST, &server);
 320             if (ret)
 321                 krb5_err(context, 1, ret, "krb5_sname_to_principal");
 322
 323             for (i = 2; i < argc; i++) {
 324                 ret = krb5_principal_set_comp_string(context, server, i, argv[i]);
 325                 if (ret)
 326                     krb5_err(context, 1, ret, "krb5_principal_set_comp_string");
 327             }
 328         }
 329     } else if (argc == 1) {
 330         ret = krb5_parse_name(context, argv[0], &server);
 331         if (ret)
 332             krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]);
 333     } else {
 334         usage(1);
 335     }
 336
 337     if (nametype != KRB5_NT_UNKNOWN)
 338         server->name.name_type = (NAME_TYPE)nametype;
 339
 340     ret = krb5_get_creds(context, opt, cache, server, &out);
 341     if (ret)
 342         krb5_err(context, 1, ret, "krb5_get_creds");
 343
 344     if (out_cache_str) {
 345         krb5_ccache id;
 346
 347         ret = krb5_cc_resolve(context, out_cache_str, &id);
 348         if(ret)
 349             krb5_err(context, 1, ret, "krb5_cc_resolve");
 350
 351         ret = krb5_cc_initialize(context, id, out->client);
 352         if(ret)
 353             krb5_err(context, 1, ret, "krb5_cc_initialize");
 354
 355         ret = krb5_cc_store_cred(context, id, out);
 356         if(ret)
 357             krb5_err(context, 1, ret, "krb5_cc_store_cred");
 358         krb5_cc_close(context, id);
 359     }
 360
 361     krb5_free_creds(context, out);
 362     krb5_free_principal(context, server);
 363     krb5_get_creds_opt_free(context, opt);
 364     krb5_cc_close (context, cache);
 365     krb5_free_context (context);
 366
 367     return 0;
 368 }