kuser/kinit.c

   1 /*
   2  * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "kuser_locl.h"
  37
  38 #ifdef __APPLE__
  39 #include <Security/Security.h>
  40 #endif
  41
  42 #ifndef NO_NTLM
  43 #include "heimntlm.h"
  44 #endif
  45
  46 int forwardable_flag    = -1;
  47 int proxiable_flag      = -1;
  48 int renewable_flag      = -1;
  49 int renew_flag          = 0;
  50 int pac_flag            = -1;
  51 int validate_flag       = 0;
  52 int version_flag        = 0;
  53 int help_flag           = 0;
  54 int addrs_flag          = -1;
  55 struct getarg_strings extra_addresses;
  56 int anonymous_flag      = 0;
  57 char *lifetime          = NULL;
  58 char *renew_life        = NULL;
  59 char *server_str        = NULL;
  60 char *cred_cache        = NULL;
  61 char *start_str         = NULL;
  62 static int switch_cache_flags = 1;
  63 struct getarg_strings etype_str;
  64 int use_keytab          = 0;
  65 char *keytab_str        = NULL;
  66 static krb5_keytab kt   = NULL;
  67 int do_afslog           = -1;
  68 int fcache_version;
  69 char *password_file     = NULL;
  70 char *pk_user_id        = NULL;
  71 int pk_enterprise_flag = 0;
  72 struct hx509_certs_data *ent_user_id = NULL;
  73 char *pk_x509_anchors   = NULL;
  74 int pk_use_enckey       = 0;
  75 static int canonicalize_flag = 0;
  76 static int enterprise_flag = 0;
  77 static int ok_as_delegate_flag = 0;
  78 static char *fast_armor_cache_string = NULL;
  79 static int use_referrals_flag = 0;
  80 static int windows_flag = 0;
  81 #ifndef NO_NTLM
  82 static char *ntlm_domain;
  83 #endif
  84
  85
  86 static struct getargs args[] = {
  87     /*
  88      * used by MIT
  89      * a: ~A
  90      * V: verbose
  91      * F: ~f
  92      * P: ~p
  93      * C: v4 cache name?
  94      * 5:
  95      *
  96      * old flags
  97      * 4:
  98      * 9:
  99      */
 100     { "afslog",         0  , arg_flag, &do_afslog,
 101       NP_("obtain afs tokens", ""), NULL },
 102
 103     { "cache",          'c', arg_string, &cred_cache,
 104       NP_("credentials cache", ""), "cachename" },
 105
 106     { "forwardable",    'F', arg_negative_flag, &forwardable_flag,
 107       NP_("get tickets not forwardable", ""), NULL },
 108
 109     { NULL,             'f', arg_flag, &forwardable_flag,
 110       NP_("get forwardable tickets", ""), NULL },
 111
 112     { "keytab",         't', arg_string, &keytab_str,
 113       NP_("keytab to use", ""), "keytabname" },
 114
 115     { "lifetime",       'l', arg_string, &lifetime,
 116       NP_("lifetime of tickets", ""), "time" },
 117
 118     { "proxiable",      'p', arg_flag, &proxiable_flag,
 119       NP_("get proxiable tickets", ""), NULL },
 120
 121     { "renew",          'R', arg_flag, &renew_flag,
 122       NP_("renew TGT", ""), NULL },
 123
 124     { "renewable",      0,   arg_flag, &renewable_flag,
 125       NP_("get renewable tickets", ""), NULL },
 126
 127     { "renewable-life", 'r', arg_string, &renew_life,
 128       NP_("renewable lifetime of tickets", ""), "time" },
 129
 130     { "server",         'S', arg_string, &server_str,
 131       NP_("server to get ticket for", ""), "principal" },
 132
 133     { "start-time",     's', arg_string, &start_str,
 134       NP_("when ticket gets valid", ""), "time" },
 135
 136     { "use-keytab",     'k', arg_flag, &use_keytab,
 137       NP_("get key from keytab", ""), NULL },
 138
 139     { "validate",       'v', arg_flag, &validate_flag,
 140       NP_("validate TGT", ""), NULL },
 141
 142     { "enctypes",       'e', arg_strings, &etype_str,
 143       NP_("encryption types to use", ""), "enctypes" },
 144
 145     { "fcache-version", 0,   arg_integer, &fcache_version,
 146       NP_("file cache version to create", ""), NULL },
 147
 148     { "addresses",      'A',   arg_negative_flag,       &addrs_flag,
 149       NP_("request a ticket with no addresses", ""), NULL },
 150
 151     { "extra-addresses",'a', arg_strings,       &extra_addresses,
 152       NP_("include these extra addresses", ""), "addresses" },
 153
 154     { "anonymous",      0,   arg_flag,  &anonymous_flag,
 155       NP_("request an anonymous ticket", ""), NULL },
 156
 157     { "request-pac",    0,   arg_flag,  &pac_flag,
 158       NP_("request a Windows PAC", ""), NULL },
 159
 160     { "password-file",  0,   arg_string, &password_file,
 161       NP_("read the password from a file", ""), NULL },
 162
 163     { "canonicalize",0,   arg_flag, &canonicalize_flag,
 164       NP_("canonicalize client principal", ""), NULL },
 165
 166     { "enterprise",0,   arg_flag, &enterprise_flag,
 167       NP_("parse principal as a KRB5-NT-ENTERPRISE name", ""), NULL },
 168 #ifdef PKINIT
 169     { "pk-enterprise",  0,      arg_flag,       &pk_enterprise_flag,
 170       NP_("use enterprise name from certificate", ""), NULL },
 171
 172     { "pk-user",        'C',    arg_string,     &pk_user_id,
 173       NP_("principal's public/private/certificate identifier", ""), "id" },
 174
 175     { "x509-anchors",   'D',  arg_string, &pk_x509_anchors,
 176       NP_("directory with CA certificates", ""), "directory" },
 177
 178     { "pk-use-enckey",  0,  arg_flag, &pk_use_enckey,
 179       NP_("Use RSA encrypted reply (instead of DH)", ""), NULL },
 180 #endif
 181 #ifndef NO_NTLM
 182     { "ntlm-domain",    0,  arg_string, &ntlm_domain,
 183       NP_("NTLM domain", ""), "domain" },
 184 #endif
 185
 186     { "change-default",  0,  arg_negative_flag, &switch_cache_flags,
 187       NP_("switch the default cache to the new credentials cache", ""), NULL },
 188
 189     { "ok-as-delegate", 0,  arg_flag, &ok_as_delegate_flag,
 190       NP_("honor ok-as-delegate on tickets", ""), NULL },
 191
 192     { "fast-armor-cache",       0,  arg_string, &fast_armor_cache_string,
 193       NP_("use this credential cache as FAST armor cache", ""), "cache" },
 194
 195     { "use-referrals",  0,  arg_flag, &use_referrals_flag,
 196       NP_("only use referrals, no dns canalisation", ""), NULL },
 197
 198     { "windows",        0,  arg_flag, &windows_flag,
 199       NP_("get windows behavior", ""), NULL },
 200
 201     { "version",        0,   arg_flag, &version_flag, NULL, NULL },
 202     { "help",           0,   arg_flag, &help_flag, NULL, NULL }
 203 };
 204
 205 static void
 206 usage(int ret)
 207 {
 208     arg_printusage_i18n(args, sizeof(args)/sizeof(*args), N_("Usage: ", ""),
 209                         NULL, "[principal [command]]", getarg_i18n);
 210     exit(ret);
 211 }
 212
 213 static krb5_error_code
 214 get_server(krb5_context context,
 215            krb5_principal client,
 216            const char *server,
 217            krb5_principal *princ)
 218 {
 219     krb5_const_realm realm;
 220     if (server)
 221         return krb5_parse_name(context, server, princ);
 222
 223     realm = krb5_principal_get_realm(context, client);
 224     return krb5_make_principal(context, princ, realm,
 225                                KRB5_TGS_NAME, realm, NULL);
 226 }
 227
 228 static int
 229 renew_validate(krb5_context context,
 230                int renew,
 231                int validate,
 232                krb5_ccache cache,
 233                const char *server,
 234                krb5_deltat life)
 235 {
 236     krb5_error_code ret;
 237     krb5_creds in, *out = NULL;
 238     krb5_kdc_flags flags;
 239
 240     memset(&in, 0, sizeof(in));
 241
 242     ret = krb5_cc_get_principal(context, cache, &in.client);
 243     if (ret) {
 244         krb5_warn(context, ret, "krb5_cc_get_principal");
 245         return ret;
 246     }
 247     ret = get_server(context, in.client, server, &in.server);
 248     if (ret) {
 249         krb5_warn(context, ret, "get_server");
 250         goto out;
 251     }
 252
 253     if (renew) {
 254         /*
 255          * no need to check the error here, it's only to be
 256          * friendly to the user
 257          */
 258         krb5_get_credentials(context, KRB5_GC_CACHED, cache, &in, &out);
 259     }
 260
 261     flags.i = 0;
 262     flags.b.renewable         = flags.b.renew = renew;
 263     flags.b.validate          = validate;
 264
 265     if (forwardable_flag != -1)
 266         flags.b.forwardable       = forwardable_flag;
 267     else if (out)
 268         flags.b.forwardable       = out->flags.b.forwardable;
 269
 270     if (proxiable_flag != -1)
 271         flags.b.proxiable         = proxiable_flag;
 272     else if (out)
 273         flags.b.proxiable         = out->flags.b.proxiable;
 274
 275     if (anonymous_flag)
 276         flags.b.request_anonymous = anonymous_flag;
 277     if (life)
 278         in.times.endtime = time(NULL) + life;
 279
 280     if (out) {
 281         krb5_free_creds(context, out);
 282         out = NULL;
 283     }
 284
 285
 286     ret = krb5_get_kdc_cred(context,
 287                             cache,
 288                             flags,
 289                             NULL,
 290                             NULL,
 291                             &in,
 292                             &out);
 293     if (ret) {
 294         krb5_warn(context, ret, "krb5_get_kdc_cred");
 295         goto out;
 296     }
 297     ret = krb5_cc_initialize(context, cache, in.client);
 298     if (ret) {
 299         krb5_free_creds(context, out);
 300         krb5_warn(context, ret, "krb5_cc_initialize");
 301         goto out;
 302     }
 303     ret = krb5_cc_store_cred(context, cache, out);
 304
 305     if (ret == 0 && server == NULL) {
 306         /* only do this if it's a general renew-my-tgt request */
 307 #ifndef NO_AFS
 308         if (do_afslog && k_hasafs())
 309             krb5_afslog(context, cache, NULL, NULL);
 310 #endif
 311     }
 312
 313     krb5_free_creds(context, out);
 314     if (ret) {
 315         krb5_warn(context, ret, "krb5_cc_store_cred");
 316         goto out;
 317     }
 318 out:
 319     krb5_free_cred_contents(context, &in);
 320     return ret;
 321 }
 322
 323 #ifndef NO_NTLM
 324
 325 static krb5_error_code
 326 store_ntlmkey(krb5_context context, krb5_ccache id,
 327               const char *domain, struct ntlm_buf *buf)
 328 {
 329     krb5_error_code ret;
 330     krb5_data data;
 331     char *name;
 332     int aret;
 333
 334     aret = asprintf(&name, "ntlm-key-%s", domain);
 335     if (aret == -1 || name == NULL) {
 336         krb5_clear_error_message(context);
 337         return ENOMEM;
 338     }
 339
 340     data.length = buf->length;
 341     data.data = buf->data;
 342
 343     ret = krb5_cc_set_config(context, id, NULL, name, &data);
 344     free(name);
 345     return ret;
 346 }
 347 #endif
 348
 349 static krb5_error_code
 350 get_new_tickets(krb5_context context,
 351                 krb5_principal principal,
 352                 krb5_ccache ccache,
 353                 krb5_deltat ticket_life,
 354                 int interactive)
 355 {
 356     krb5_error_code ret;
 357     krb5_get_init_creds_opt *opt;
 358     krb5_creds cred;
 359     char passwd[256];
 360     krb5_deltat start_time = 0;
 361     krb5_deltat renew = 0;
 362     const char *renewstr = NULL;
 363     krb5_enctype *enctype = NULL;
 364     krb5_ccache tempccache;
 365     krb5_init_creds_context ctx;
 366 #ifndef NO_NTLM
 367     struct ntlm_buf ntlmkey;
 368     memset(&ntlmkey, 0, sizeof(ntlmkey));
 369 #endif
 370     passwd[0] = '\0';
 371
 372     if (password_file) {
 373         FILE *f;
 374
 375         if (strcasecmp("STDIN", password_file) == 0)
 376             f = stdin;
 377         else
 378             f = fopen(password_file, "r");
 379         if (f == NULL)
 380             krb5_errx(context, 1, "Failed to open the password file %s",
 381                       password_file);
 382
 383         if (fgets(passwd, sizeof(passwd), f) == NULL)
 384             krb5_errx(context, 1,
 385                       N_("Failed to read password from file %s", ""),
 386                       password_file);
 387         if (f != stdin)
 388             fclose(f);
 389         passwd[strcspn(passwd, "\n")] = '\0';
 390     }
 391
 392 #ifdef __APPLE__
 393     if (passwd[0] == '\0') {
 394         const char *realm;
 395         OSStatus osret;
 396         UInt32 length;
 397         void *buffer;
 398         char *name;
 399
 400         realm = krb5_principal_get_realm(context, principal);
 401
 402         ret = krb5_unparse_name_flags(context, principal,
 403                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
 404         if (ret)
 405             goto nopassword;
 406
 407         osret = SecKeychainFindGenericPassword(NULL, strlen(realm), realm,
 408                                                strlen(name), name,
 409                                                &length, &buffer, NULL);
 410         free(name);
 411         if (osret == noErr && length < sizeof(passwd) - 1) {
 412             memcpy(passwd, buffer, length);
 413             passwd[length] = '\0';
 414         }
 415     nopassword:
 416         do { } while(0);
 417     }
 418 #endif
 419
 420     memset(&cred, 0, sizeof(cred));
 421
 422     ret = krb5_get_init_creds_opt_alloc(context, &opt);
 423     if (ret)
 424         krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
 425
 426     krb5_get_init_creds_opt_set_default_flags(context, "kinit",
 427         krb5_principal_get_realm(context, principal), opt);
 428
 429     if (forwardable_flag != -1)
 430         krb5_get_init_creds_opt_set_forwardable(opt, forwardable_flag);
 431     if (proxiable_flag != -1)
 432         krb5_get_init_creds_opt_set_proxiable(opt, proxiable_flag);
 433     if (anonymous_flag)
 434         krb5_get_init_creds_opt_set_anonymous(opt, anonymous_flag);
 435     if (pac_flag != -1)
 436         krb5_get_init_creds_opt_set_pac_request(context, opt,
 437                                                 pac_flag ? TRUE : FALSE);
 438     if (canonicalize_flag)
 439         krb5_get_init_creds_opt_set_canonicalize(context, opt, TRUE);
 440     if (pk_enterprise_flag || enterprise_flag || canonicalize_flag || windows_flag)
 441         krb5_get_init_creds_opt_set_win2k(context, opt, TRUE);
 442     if (pk_user_id || ent_user_id || anonymous_flag) {
 443         ret = krb5_get_init_creds_opt_set_pkinit(context, opt,
 444                                                  principal,
 445                                                  pk_user_id,
 446                                                  pk_x509_anchors,
 447                                                  NULL,
 448                                                  NULL,
 449                                                  pk_use_enckey ? 2 : 0 |
 450                                                  anonymous_flag ? 4 : 0,
 451                                                  krb5_prompter_posix,
 452                                                  NULL,
 453                                                  passwd);
 454         if (ret)
 455             krb5_err(context, 1, ret, "krb5_get_init_creds_opt_set_pkinit");
 456         if (ent_user_id)
 457             krb5_get_init_creds_opt_set_pkinit_user_certs(context, opt, ent_user_id);
 458     }
 459
 460     if (addrs_flag != -1)
 461         krb5_get_init_creds_opt_set_addressless(context, opt,
 462                                                 addrs_flag ? FALSE : TRUE);
 463
 464     if (renew_life == NULL && renewable_flag)
 465         renewstr = "1 month";
 466     if (renew_life)
 467         renewstr = renew_life;
 468     if (renewstr) {
 469         renew = parse_time(renewstr, "s");
 470         if (renew < 0)
 471             errx(1, "unparsable time: %s", renewstr);
 472
 473         krb5_get_init_creds_opt_set_renew_life(opt, renew);
 474     }
 475
 476     if (ticket_life != 0)
 477         krb5_get_init_creds_opt_set_tkt_life(opt, ticket_life);
 478
 479     if (start_str) {
 480         int tmp = parse_time(start_str, "s");
 481         if (tmp < 0)
 482             errx(1, N_("unparsable time: %s", ""), start_str);
 483
 484         start_time = tmp;
 485     }
 486
 487     if (etype_str.num_strings) {
 488         int i;
 489
 490         enctype = malloc(etype_str.num_strings * sizeof(*enctype));
 491         if (enctype == NULL)
 492             errx(1, "out of memory");
 493         for(i = 0; i < etype_str.num_strings; i++) {
 494             ret = krb5_string_to_enctype(context,
 495                                          etype_str.strings[i],
 496                                          &enctype[i]);
 497             if (ret)
 498                 errx(1, "unrecognized enctype: %s", etype_str.strings[i]);
 499         }
 500         krb5_get_init_creds_opt_set_etype_list(opt, enctype,
 501                                                etype_str.num_strings);
 502     }
 503
 504     ret = krb5_init_creds_init(context, principal, krb5_prompter_posix, NULL, start_time, opt, &ctx);
 505     if (ret)
 506         krb5_err(context, 1, ret, "krb5_init_creds_init");
 507
 508     if (server_str) {
 509         ret = krb5_init_creds_set_service(context, ctx, server_str);
 510         if (ret)
 511             krb5_err(context, 1, ret, "krb5_init_creds_set_service");
 512     }
 513
 514     if (fast_armor_cache_string) {
 515         krb5_ccache fastid;
 516
 517         ret = krb5_cc_resolve(context, fast_armor_cache_string, &fastid);
 518         if (ret)
 519             krb5_err(context, 1, ret, "krb5_cc_resolve(FAST cache)");
 520
 521         ret = krb5_init_creds_set_fast_ccache(context, ctx, fastid);
 522         if (ret)
 523             krb5_err(context, 1, ret, "krb5_init_creds_set_fast_ccache");
 524     }
 525
 526     if (use_keytab || keytab_str) {
 527         ret = krb5_init_creds_set_keytab(context, ctx, kt);
 528         if (ret)
 529             krb5_err(context, 1, ret, "krb5_init_creds_set_keytab");
 530     } else if (pk_user_id || ent_user_id || anonymous_flag) {
 531
 532     } else if (!interactive) {
 533         static int already_warned = 0;
 534
 535         if (!already_warned)
 536             krb5_warnx(context, "Not interactive, failed to get "
 537               "initial ticket");
 538         krb5_get_init_creds_opt_free(context, opt);
 539         already_warned = 1;
 540         return 0;
 541     } else {
 542
 543         if (passwd[0] == '\0') {
 544             char *p, *prompt;
 545             int aret = 0;
 546
 547             ret = krb5_unparse_name(context, principal, &p);
 548             if (!ret) {
 549                 aret = asprintf(&prompt, N_("%s's Password: ", ""), p);
 550                 free(p);
 551             }
 552             if (ret || aret == -1)
 553                 errx(1, "failed to generate passwd prompt: not enough memory");
 554
 555             if (UI_UTIL_read_pw_string(passwd, sizeof(passwd)-1, prompt, 0)){
 556                 memset(passwd, 0, sizeof(passwd));
 557                 errx(1, "failed to read password");
 558             }
 559             free(prompt);
 560         }
 561
 562         if (passwd[0]) {
 563             ret = krb5_init_creds_set_password(context, ctx, passwd);
 564             if (ret)
 565                 krb5_err(context, 1, ret, "krb5_init_creds_set_password");
 566         }
 567     }
 568
 569     ret = krb5_init_creds_get(context, ctx);
 570
 571 #ifndef NO_NTLM
 572     if (ntlm_domain && passwd[0])
 573         heim_ntlm_nt_key(passwd, &ntlmkey);
 574 #endif
 575     memset(passwd, 0, sizeof(passwd));
 576
 577     switch(ret){
 578     case 0:
 579         break;
 580     case KRB5_LIBOS_PWDINTR: /* don't print anything if it was just C-c:ed */
 581         exit(1);
 582     case KRB5KRB_AP_ERR_BAD_INTEGRITY:
 583     case KRB5KRB_AP_ERR_MODIFIED:
 584     case KRB5KDC_ERR_PREAUTH_FAILED:
 585     case KRB5_GET_IN_TKT_LOOP:
 586         krb5_errx(context, 1, N_("Password incorrect", ""));
 587         break;
 588     case KRB5KRB_AP_ERR_V4_REPLY:
 589         krb5_errx(context, 1, N_("Looks like a Kerberos 4 reply", ""));
 590         break;
 591     default:
 592         krb5_err(context, 1, ret, "krb5_get_init_creds");
 593     }
 594
 595     krb5_process_last_request(context, opt, ctx);
 596
 597     ret = krb5_init_creds_get_creds(context, ctx, &cred);
 598     if (ret)
 599             krb5_err(context, 1, ret, "krb5_init_creds_get_creds");
 600
 601     if (ticket_life != 0) {
 602         if (abs(cred.times.endtime - cred.times.starttime - ticket_life) > 30) {
 603             char life[64];
 604             unparse_time_approx(cred.times.endtime - cred.times.starttime,
 605                                 life, sizeof(life));
 606             krb5_warnx(context, N_("NOTICE: ticket lifetime is %s", ""), life);
 607         }
 608     }
 609     if (renew_life) {
 610         if (abs(cred.times.renew_till - cred.times.starttime - renew) > 30) {
 611             char life[64];
 612             unparse_time_approx(cred.times.renew_till - cred.times.starttime,
 613                                 life, sizeof(life));
 614             krb5_warnx(context,
 615                        N_("NOTICE: ticket renewable lifetime is %s", ""),
 616                        life);
 617         }
 618     }
 619
 620     ret = krb5_cc_new_unique(context, krb5_cc_get_type(context, ccache),
 621                              NULL, &tempccache);
 622     if (ret)
 623         krb5_err(context, 1, ret, "krb5_cc_new_unique");
 624
 625     ret = krb5_init_creds_store(context, ctx, tempccache);
 626     if (ret)
 627         krb5_err(context, 1, ret, "krb5_init_creds_store");
 628
 629     krb5_init_creds_free(context, ctx);
 630
 631     ret = krb5_cc_move(context, tempccache, ccache);
 632     if (ret)
 633         krb5_err(context, 1, ret, "krb5_cc_move");
 634
 635     if (switch_cache_flags)
 636         krb5_cc_switch(context, ccache);
 637
 638 #ifndef NO_NTLM
 639     if (ntlm_domain && ntlmkey.data)
 640         store_ntlmkey(context, ccache, ntlm_domain, &ntlmkey);
 641 #endif
 642
 643     if (ok_as_delegate_flag || windows_flag || use_referrals_flag) {
 644         unsigned char d = 0;
 645         krb5_data data;
 646
 647         if (ok_as_delegate_flag || windows_flag)
 648             d |= 1;
 649         if (use_referrals_flag || windows_flag)
 650             d |= 2;
 651
 652         data.length = 1;
 653         data.data = &d;
 654
 655         krb5_cc_set_config(context, ccache, NULL, "realm-config", &data);
 656     }
 657
 658     krb5_get_init_creds_opt_free(context, opt);
 659
 660     if (enctype)
 661         free(enctype);
 662
 663     return 0;
 664 }
 665
 666 static time_t
 667 ticket_lifetime(krb5_context context, krb5_ccache cache, krb5_principal client,
 668                 const char *server, time_t *renew)
 669 {
 670     krb5_creds in_cred, *cred;
 671     krb5_error_code ret;
 672     time_t timeout;
 673     time_t curtime;
 674
 675     memset(&in_cred, 0, sizeof(in_cred));
 676
 677     ret = krb5_cc_get_principal(context, cache, &in_cred.client);
 678     if (ret) {
 679         krb5_warn(context, ret, "krb5_cc_get_principal");
 680         return 0;
 681     }
 682     ret = get_server(context, in_cred.client, server, &in_cred.server);
 683     if (ret) {
 684         krb5_free_principal(context, in_cred.client);
 685         krb5_warn(context, ret, "get_server");
 686         return 0;
 687     }
 688
 689     ret = krb5_get_credentials(context, KRB5_GC_CACHED,
 690                                cache, &in_cred, &cred);
 691     krb5_free_principal(context, in_cred.client);
 692     krb5_free_principal(context, in_cred.server);
 693     if (ret) {
 694         krb5_warn(context, ret, "krb5_get_credentials");
 695         return 0;
 696     }
 697     curtime = time(NULL);
 698     timeout = cred->times.endtime - curtime;
 699     if (timeout < 0)
 700         timeout = 0;
 701     if (renew) {
 702         *renew = cred->times.renew_till - curtime;
 703         if (*renew < 0)
 704             *renew = 0;
 705     }
 706     krb5_free_creds(context, cred);
 707     return timeout;
 708 }
 709
 710 struct renew_ctx {
 711     krb5_context context;
 712     krb5_ccache  ccache;
 713     krb5_principal principal;
 714     krb5_deltat ticket_life;
 715 };
 716
 717 static time_t
 718 renew_func(void *ptr)
 719 {
 720     struct renew_ctx *ctx = ptr;
 721     time_t expire;
 722     time_t renew_expire;
 723     static time_t exp_delay = 1;
 724
 725     expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
 726                              server_str, &renew_expire);
 727
 728     if (renew_expire > expire) {
 729         renew_validate(ctx->context, 1, validate_flag, ctx->ccache,
 730                        server_str, ctx->ticket_life);
 731         expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
 732                                  server_str, &renew_expire);
 733     }
 734
 735     if (expire < ctx->ticket_life / 2) {
 736         get_new_tickets(ctx->context, ctx->principal,
 737                         ctx->ccache, ctx->ticket_life, 0);
 738         expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
 739                                  server_str, &renew_expire);
 740     }
 741
 742 #ifndef NO_AFS
 743     if (do_afslog && k_hasafs())
 744         krb5_afslog(ctx->context, ctx->ccache, NULL, NULL);
 745 #endif
 746
 747     /*
 748      * If our tickets have expired and we been able to either renew them
 749      * or obtain new tickets, then we still call this function but we use
 750      * an exponential backoff.  This should take care of the case where
 751      * we are using stored credentials but the KDC has been unavailable
 752      * for some reason...
 753      */
 754
 755     if (expire < 1) {
 756         if (exp_delay < 7200)
 757             exp_delay *= 2;
 758         return exp_delay;
 759     }
 760     exp_delay = 1;
 761
 762     return expire / 2 + 1;
 763 }
 764
 765 static void
 766 set_princ_realm(krb5_context context,
 767                 krb5_principal principal,
 768                 const char *realm)
 769 {
 770     krb5_error_code ret;
 771
 772     if ((ret = krb5_principal_set_realm(context, principal, realm)) != 0)
 773         krb5_err(context, 1, ret, "krb5_principal_set_realm");
 774 }
 775
 776 static void
 777 parse_name_realm(krb5_context context,
 778                  const char *name,
 779                  int flags,
 780                  const char *realm,
 781                  krb5_principal *princ)
 782 {
 783     krb5_error_code ret;
 784
 785     if (realm)
 786         flags |= KRB5_PRINCIPAL_PARSE_NO_DEF_REALM;
 787     if ((ret = krb5_parse_name_flags(context, name, flags, princ)) != 0)
 788         krb5_err(context, 1, ret, "krb5_parse_name_flags");
 789     if (realm && krb5_principal_get_realm(context, *princ) == NULL)
 790         set_princ_realm(context, *princ, realm);
 791 }
 792
 793 static char *
 794 get_default_realm(krb5_context context)
 795 {
 796     char *realm;
 797     krb5_error_code ret;
 798
 799     if ((ret = krb5_get_default_realm(context, &realm)) != 0)
 800         krb5_err(context, 1, ret, "krb5_get_default_realm");
 801     return realm;
 802 }
 803
 804 static void
 805 get_default_principal(krb5_context context, krb5_principal *princ)
 806 {
 807     krb5_error_code ret;
 808
 809     if ((ret = krb5_get_default_principal(context, princ)) != 0)
 810         krb5_err(context, 1, ret, "krb5_get_default_principal");
 811 }
 812
 813 static char *
 814 get_user_realm(krb5_context context)
 815 {
 816     krb5_error_code ret;
 817     char *user_realm = NULL;
 818
 819     /*
 820      * If memory allocation fails, we don't try to use the wrong realm,
 821      * that will trigger misleading error messages complicate support.
 822      */
 823     krb5_appdefault_string(context, "kinit", NULL, "user_realm", "",
 824                            &user_realm);
 825     if (user_realm == NULL) {
 826         ret = krb5_enomem(context);
 827         krb5_err(context, 1, ret, "krb5_appdefault_string");
 828     }
 829
 830     if (*user_realm == 0) {
 831         free(user_realm);
 832         user_realm = NULL;
 833     }
 834
 835     return user_realm;
 836 }
 837
 838 static void
 839 get_princ(krb5_context context, krb5_principal *principal, const char *name)
 840 {
 841     krb5_error_code ret;
 842     krb5_principal tmp;
 843     int parseflags = 0;
 844     char *user_realm;
 845
 846     if (name == NULL) {
 847         krb5_ccache ccache;
 848
 849         /* If credential cache provides a client principal, use that. */
 850         if (krb5_cc_default(context, &ccache) == 0) {
 851             ret = krb5_cc_get_principal(context, ccache, principal);
 852             krb5_cc_close(context, ccache);
 853             if (ret == 0)
 854                 return;
 855         }
 856     }
 857
 858     user_realm = get_user_realm(context);
 859
 860     if (name) {
 861         if (canonicalize_flag || enterprise_flag)
 862             parseflags |= KRB5_PRINCIPAL_PARSE_ENTERPRISE;
 863
 864         parse_name_realm(context, name, parseflags, user_realm, &tmp);
 865
 866         if (user_realm && krb5_principal_get_num_comp(context, tmp) > 1) {
 867             /* Principal is instance qualified, reparse with default realm. */
 868             krb5_free_principal(context, tmp);
 869             parse_name_realm(context, name, parseflags, NULL, principal);
 870         } else {
 871             *principal = tmp;
 872         }
 873     } else {
 874         get_default_principal(context, principal);
 875         if (user_realm)
 876             set_princ_realm(context, *principal, user_realm);
 877     }
 878
 879     if (user_realm)
 880         free(user_realm);
 881 }
 882
 883 static void
 884 get_princ_kt(krb5_context context,
 885              krb5_principal *principal,
 886              char *name)
 887 {
 888     krb5_error_code ret;
 889     krb5_principal tmp;
 890     krb5_ccache ccache;
 891     krb5_kt_cursor cursor;
 892     krb5_keytab_entry entry;
 893     int parseflags = 0;
 894     char *def_realm;
 895
 896     if (name == NULL) {
 897         /*
 898          * If the credential cache exists and specifies a client principal,
 899          * use that.
 900          */
 901         if (krb5_cc_default(context, &ccache) == 0) {
 902             ret = krb5_cc_get_principal(context, ccache, principal);
 903             krb5_cc_close(context, ccache);
 904             if (ret == 0)
 905                 return;
 906         }
 907     }
 908
 909     if (name) {
 910         /* If the principal specifies an explicit realm, just use that. */
 911         parseflags |= KRB5_PRINCIPAL_PARSE_NO_DEF_REALM;
 912         parse_name_realm(context, name, parseflags, NULL, &tmp);
 913         if (krb5_principal_get_realm(context, tmp) != NULL) {
 914             *principal = tmp;
 915             return;
 916         }
 917     } else {
 918         /* Otherwise, search keytab for bare name of the default principal. */
 919         get_default_principal(context, &tmp);
 920         set_princ_realm(context, tmp, NULL);
 921     }
 922
 923     def_realm = get_default_realm(context);
 924
 925     ret = krb5_kt_start_seq_get(context, kt, &cursor);
 926     if (ret)
 927         krb5_err(context, 1, ret, "krb5_kt_start_seq_get");
 928
 929     while (ret == 0 &&
 930            krb5_kt_next_entry(context, kt, &entry, &cursor) == 0) {
 931         const char *realm;
 932
 933         if (!krb5_principal_compare_any_realm(context, tmp, entry.principal))
 934             continue;
 935         if (*principal &&
 936             krb5_principal_compare(context, *principal, entry.principal))
 937             continue;
 938         /* The default realm takes precedence */
 939         realm = krb5_principal_get_realm(context, entry.principal);
 940         if (*principal && strcmp(def_realm, realm) == 0) {
 941             krb5_free_principal(context, *principal);
 942             ret = krb5_copy_principal(context, entry.principal, principal);
 943             break;
 944         }
 945         if (!*principal)
 946             ret = krb5_copy_principal(context, entry.principal, principal);
 947     }
 948     if (ret != 0 || (ret = krb5_kt_end_seq_get(context, kt, &cursor)) != 0)
 949         krb5_err(context, 1, ret, "get_princ_kt");
 950     if (!*principal)
 951         parse_name_realm(context, name, parseflags, NULL, principal);
 952
 953     krb5_free_principal(context, tmp);
 954     free(def_realm);
 955 }
 956
 957 int
 958 main(int argc, char **argv)
 959 {
 960     krb5_error_code ret;
 961     krb5_context context;
 962     krb5_ccache  ccache;
 963     krb5_principal principal = NULL;
 964     int optidx = 0;
 965     krb5_deltat ticket_life = 0;
 966
 967     setprogname(argv[0]);
 968
 969     setlocale(LC_ALL, "");
 970     bindtextdomain("heimdal_kuser", HEIMDAL_LOCALEDIR);
 971     textdomain("heimdal_kuser");
 972
 973     ret = krb5_init_context(&context);
 974     if (ret == KRB5_CONFIG_BADFORMAT)
 975         errx(1, "krb5_init_context failed to parse configuration file");
 976     else if (ret)
 977         errx(1, "krb5_init_context failed: %d", ret);
 978
 979     if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 980         usage(1);
 981
 982     if (help_flag)
 983         usage(0);
 984
 985     if (version_flag) {
 986         print_version(NULL);
 987         exit(0);
 988     }
 989
 990     argc -= optidx;
 991     argv += optidx;
 992
 993     /*
 994      * Open the keytab now, we use the keytab to determine the principal's
 995      * realm when the requested principal has no realm.
 996      */
 997     if (use_keytab || keytab_str) {
 998         if (keytab_str)
 999             ret = krb5_kt_resolve(context, keytab_str, &kt);
1000         else
1001             ret = krb5_kt_default(context, &kt);
1002         if (ret)
1003             krb5_err(context, 1, ret, "resolving keytab");
1004     }
1005
1006     if (pk_enterprise_flag) {
1007         ret = krb5_pk_enterprise_cert(context, pk_user_id,
1008                                       argv[0], &principal,
1009                                       &ent_user_id);
1010         if (ret)
1011             krb5_err(context, 1, ret, "krb5_pk_enterprise_certs");
1012
1013         pk_user_id = NULL;
1014
1015     } else if (anonymous_flag) {
1016
1017         ret = krb5_make_principal(context, &principal, argv[0],
1018                                   KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME,
1019                                   NULL);
1020         if (ret)
1021             krb5_err(context, 1, ret, "krb5_make_principal");
1022         krb5_principal_set_type(context, principal, KRB5_NT_WELLKNOWN);
1023
1024     } else if (use_keytab || keytab_str) {
1025         get_princ_kt(context, &principal, argv[0]);
1026     } else {
1027         get_princ(context, &principal, argv[0]);
1028     }
1029
1030     if (fcache_version)
1031         krb5_set_fcache_version(context, fcache_version);
1032
1033     if (renewable_flag == -1)
1034         /* this seems somewhat pointless, but whatever */
1035         krb5_appdefault_boolean(context, "kinit",
1036                                 krb5_principal_get_realm(context, principal),
1037                                 "renewable", FALSE, &renewable_flag);
1038     if (do_afslog == -1)
1039         krb5_appdefault_boolean(context, "kinit",
1040                                 krb5_principal_get_realm(context, principal),
1041                                 "afslog", TRUE, &do_afslog);
1042
1043     if (cred_cache)
1044         ret = krb5_cc_resolve(context, cred_cache, &ccache);
1045     else {
1046         if (argc > 1) {
1047             char s[1024];
1048             ret = krb5_cc_new_unique(context, NULL, NULL, &ccache);
1049             if (ret)
1050                 krb5_err(context, 1, ret, "creating cred cache");
1051             snprintf(s, sizeof(s), "%s:%s",
1052                      krb5_cc_get_type(context, ccache),
1053                      krb5_cc_get_name(context, ccache));
1054             setenv("KRB5CCNAME", s, 1);
1055         } else {
1056             ret = krb5_cc_cache_match(context, principal, &ccache);
1057             if (ret) {
1058                 const char *type;
1059                 ret = krb5_cc_default(context, &ccache);
1060                 if (ret)
1061                     krb5_err(context, 1, ret,
1062                              N_("resolving credentials cache", ""));
1063
1064                 /*
1065                  * Check if the type support switching, and we do,
1066                  * then do that instead over overwriting the current
1067                  * default credential
1068                  */
1069                 type = krb5_cc_get_type(context, ccache);
1070                 if (krb5_cc_support_switch(context, type)) {
1071                     krb5_cc_close(context, ccache);
1072                     ret = krb5_cc_new_unique(context, type, NULL, &ccache);
1073                 }
1074             }
1075         }
1076     }
1077     if (ret)
1078         krb5_err(context, 1, ret, N_("resolving credentials cache", ""));
1079
1080 #ifndef NO_AFS
1081     if (argc > 1 && k_hasafs())
1082         k_setpag();
1083 #endif
1084
1085     if (lifetime) {
1086         int tmp = parse_time(lifetime, "s");
1087         if (tmp < 0)
1088             errx(1, N_("unparsable time: %s", ""), lifetime);
1089
1090         ticket_life = tmp;
1091     }
1092
1093     if (addrs_flag == 0 && extra_addresses.num_strings > 0)
1094         krb5_errx(context, 1,
1095                   N_("specifying both extra addresses and "
1096                      "no addresses makes no sense", ""));
1097     {
1098         int i;
1099         krb5_addresses addresses;
1100         memset(&addresses, 0, sizeof(addresses));
1101         for(i = 0; i < extra_addresses.num_strings; i++) {
1102             ret = krb5_parse_address(context, extra_addresses.strings[i],
1103                                      &addresses);
1104             if (ret == 0) {
1105                 krb5_add_extra_addresses(context, &addresses);
1106                 krb5_free_addresses(context, &addresses);
1107             }
1108         }
1109         free_getarg_strings(&extra_addresses);
1110     }
1111
1112     if (renew_flag || validate_flag) {
1113         ret = renew_validate(context, renew_flag, validate_flag,
1114                              ccache, server_str, ticket_life);
1115         exit(ret != 0);
1116     }
1117
1118     get_new_tickets(context, principal, ccache, ticket_life, 1);
1119
1120 #ifndef NO_AFS
1121     if (do_afslog && k_hasafs())
1122         krb5_afslog(context, ccache, NULL, NULL);
1123 #endif
1124     if (argc > 1) {
1125         struct renew_ctx ctx;
1126         time_t timeout;
1127
1128         timeout = ticket_lifetime(context, ccache, principal,
1129                                   server_str, NULL) / 2;
1130
1131         ctx.context = context;
1132         ctx.ccache = ccache;
1133         ctx.principal = principal;
1134         ctx.ticket_life = ticket_life;
1135
1136         ret = simple_execvp_timed(argv[1], argv+1,
1137                                   renew_func, &ctx, timeout);
1138 #define EX_NOEXEC       126
1139 #define EX_NOTFOUND     127
1140         if (ret == EX_NOEXEC)
1141             krb5_warnx(context, N_("permission denied: %s", ""), argv[1]);
1142         else if (ret == EX_NOTFOUND)
1143             krb5_warnx(context, N_("command not found: %s", ""), argv[1]);
1144
1145         krb5_cc_destroy(context, ccache);
1146 #ifndef NO_AFS
1147         if (k_hasafs())
1148             k_unlog();
1149 #endif
1150     } else {
1151         krb5_cc_close(context, ccache);
1152         ret = 0;
1153     }
1154     krb5_free_principal(context, principal);
1155     if (kt)
1156         krb5_kt_close(context, kt);
1157     krb5_free_context(context);
1158     return ret;
1159 }