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 krb5_error_code
 229 copy_configs(krb5_context context,
 230              krb5_ccache dst,
 231              krb5_ccache src,
 232              krb5_principal start_ticket_server)
 233 {
 234     krb5_error_code ret;
 235     const char *cfg_names[] = {"realm-config", "FriendlyName", NULL};
 236     const char *cfg_names_w_pname[] = {"fast_avail", NULL};
 237     krb5_data cfg_data;
 238     size_t i;
 239
 240     for (i = 0; cfg_names[i]; i++) {
 241         ret = krb5_cc_get_config(context, src, NULL, cfg_names[i], &cfg_data);
 242         if (ret == KRB5_CC_NOTFOUND || ret == KRB5_CC_END) {
 243             continue;
 244         } else if (ret) {
 245             krb5_warn(context, ret, "krb5_cc_get_config");
 246             return ret;
 247         }
 248         ret = krb5_cc_set_config(context, dst, NULL, cfg_names[i], &cfg_data);
 249         if (ret)
 250             krb5_warn(context, ret, "krb5_cc_set_config");
 251     }
 252     for (i = 0; start_ticket_server && cfg_names_w_pname[i]; i++) {
 253         ret = krb5_cc_get_config(context, src, start_ticket_server,
 254                                  cfg_names_w_pname[i], &cfg_data);
 255         if (ret == KRB5_CC_NOTFOUND || ret == KRB5_CC_END) {
 256             continue;
 257         } else if (ret) {
 258             krb5_warn(context, ret, "krb5_cc_get_config");
 259             return ret;
 260         }
 261         ret = krb5_cc_set_config(context, dst, start_ticket_server,
 262                                  cfg_names_w_pname[i], &cfg_data);
 263         if (ret && ret != KRB5_CC_NOTFOUND)
 264             krb5_warn(context, ret, "krb5_cc_set_config");
 265     }
 266     /*
 267      * We don't copy cc configs for any other principals though (mostly
 268      * those are per-target time offsets and the like, so it's bad to
 269      * lose them, but hardly the end of the world, and as they may not
 270      * expire anyways, it's good to let them go).
 271      */
 272     return 0;
 273 }
 274
 275 static krb5_error_code
 276 renew_validate(krb5_context context,
 277                int renew,
 278                int validate,
 279                krb5_ccache cache,
 280                const char *server,
 281                krb5_deltat life)
 282 {
 283     krb5_error_code ret;
 284     krb5_ccache tempccache = NULL;
 285     krb5_creds in, *out = NULL;
 286     krb5_kdc_flags flags;
 287
 288     memset(&in, 0, sizeof(in));
 289
 290     ret = krb5_cc_get_principal(context, cache, &in.client);
 291     if (ret) {
 292         krb5_warn(context, ret, "krb5_cc_get_principal");
 293         return ret;
 294     }
 295     ret = get_server(context, in.client, server, &in.server);
 296     if (ret) {
 297         krb5_warn(context, ret, "get_server");
 298         goto out;
 299     }
 300
 301     if (renew) {
 302         /*
 303          * no need to check the error here, it's only to be
 304          * friendly to the user
 305          */
 306         krb5_get_credentials(context, KRB5_GC_CACHED, cache, &in, &out);
 307     }
 308
 309     flags.i = 0;
 310     flags.b.renewable         = flags.b.renew = renew;
 311     flags.b.validate          = validate;
 312
 313     if (forwardable_flag != -1)
 314         flags.b.forwardable       = forwardable_flag;
 315     else if (out)
 316         flags.b.forwardable       = out->flags.b.forwardable;
 317
 318     if (proxiable_flag != -1)
 319         flags.b.proxiable         = proxiable_flag;
 320     else if (out)
 321         flags.b.proxiable         = out->flags.b.proxiable;
 322
 323     if (anonymous_flag)
 324         flags.b.request_anonymous = anonymous_flag;
 325     if (life)
 326         in.times.endtime = time(NULL) + life;
 327
 328     if (out) {
 329         krb5_free_creds(context, out);
 330         out = NULL;
 331     }
 332
 333
 334     ret = krb5_get_kdc_cred(context,
 335                             cache,
 336                             flags,
 337                             NULL,
 338                             NULL,
 339                             &in,
 340                             &out);
 341     if (ret) {
 342         krb5_warn(context, ret, "krb5_get_kdc_cred");
 343         goto out;
 344     }
 345
 346     ret = krb5_cc_new_unique(context, krb5_cc_get_type(context, cache),
 347                              NULL, &tempccache);
 348     if (ret) {
 349         krb5_warn(context, ret, "krb5_cc_new_unique");
 350         goto out;
 351     }
 352
 353     ret = krb5_cc_initialize(context, tempccache, in.client);
 354     if (ret) {
 355         krb5_warn(context, ret, "krb5_cc_initialize");
 356         goto out;
 357     }
 358
 359     ret = krb5_cc_store_cred(context, tempccache, out);
 360     if (ret) {
 361         krb5_warn(context, ret, "krb5_cc_store_cred");
 362         goto out;
 363     }
 364
 365     /*
 366      * We want to preserve cc configs as some are security-relevant, and
 367      * anyways it's the friendly thing to do.
 368      */
 369     ret = copy_configs(context, tempccache, cache, out->server);
 370     if (ret)
 371         goto out;
 372
 373     ret = krb5_cc_move(context, tempccache, cache);
 374     if (ret) {
 375         krb5_warn(context, ret, "krb5_cc_move");
 376         goto out;
 377     }
 378     tempccache = NULL;
 379
 380 out:
 381     if (tempccache)
 382         krb5_cc_close(context, tempccache);
 383     if (out)
 384         krb5_free_creds(context, out);
 385     krb5_free_cred_contents(context, &in);
 386     return ret;
 387 }
 388
 389 #ifndef NO_NTLM
 390
 391 static krb5_error_code
 392 store_ntlmkey(krb5_context context, krb5_ccache id,
 393               const char *domain, struct ntlm_buf *buf)
 394 {
 395     krb5_error_code ret;
 396     krb5_data data;
 397     char *name;
 398     int aret;
 399
 400     aret = asprintf(&name, "ntlm-key-%s", domain);
 401     if (aret == -1 || name == NULL) {
 402         krb5_clear_error_message(context);
 403         return ENOMEM;
 404     }
 405
 406     data.length = buf->length;
 407     data.data = buf->data;
 408
 409     ret = krb5_cc_set_config(context, id, NULL, name, &data);
 410     free(name);
 411     return ret;
 412 }
 413 #endif
 414
 415 static krb5_error_code
 416 get_new_tickets(krb5_context context,
 417                 krb5_principal principal,
 418                 krb5_ccache ccache,
 419                 krb5_deltat ticket_life,
 420                 int interactive)
 421 {
 422     krb5_error_code ret;
 423     krb5_creds cred;
 424     char passwd[256];
 425     krb5_deltat start_time = 0;
 426     krb5_deltat renew = 0;
 427     const char *renewstr = NULL;
 428     krb5_enctype *enctype = NULL;
 429     krb5_ccache tempccache = NULL;
 430     krb5_init_creds_context ctx = NULL;
 431     krb5_get_init_creds_opt *opt = NULL;
 432     krb5_prompter_fct prompter = krb5_prompter_posix;
 433 #ifndef NO_NTLM
 434     struct ntlm_buf ntlmkey;
 435     memset(&ntlmkey, 0, sizeof(ntlmkey));
 436 #endif
 437     passwd[0] = '\0';
 438
 439     if (!interactive)
 440         prompter = NULL;
 441
 442     if (password_file) {
 443         FILE *f;
 444
 445         if (strcasecmp("STDIN", password_file) == 0)
 446             f = stdin;
 447         else
 448             f = fopen(password_file, "r");
 449         if (f == NULL) {
 450             krb5_warnx(context, "Failed to open the password file %s",
 451                        password_file);
 452             return errno;
 453         }
 454
 455         if (fgets(passwd, sizeof(passwd), f) == NULL) {
 456             krb5_warnx(context, N_("Failed to read password from file %s", ""),
 457                        password_file);
 458             fclose(f);
 459             return EINVAL; /* XXX Need a better error */
 460         }
 461         if (f != stdin)
 462             fclose(f);
 463         passwd[strcspn(passwd, "\n")] = '\0';
 464     }
 465
 466 #ifdef __APPLE__
 467     if (passwd[0] == '\0') {
 468         const char *realm;
 469         OSStatus osret;
 470         UInt32 length;
 471         void *buffer;
 472         char *name;
 473
 474         realm = krb5_principal_get_realm(context, principal);
 475
 476         ret = krb5_unparse_name_flags(context, principal,
 477                                       KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
 478         if (ret)
 479             goto nopassword;
 480
 481         osret = SecKeychainFindGenericPassword(NULL, strlen(realm), realm,
 482                                                strlen(name), name,
 483                                                &length, &buffer, NULL);
 484         free(name);
 485         if (osret == noErr && length < sizeof(passwd) - 1) {
 486             memcpy(passwd, buffer, length);
 487             passwd[length] = '\0';
 488         }
 489     nopassword:
 490         do { } while(0);
 491     }
 492 #endif
 493
 494     memset(&cred, 0, sizeof(cred));
 495
 496     ret = krb5_get_init_creds_opt_alloc(context, &opt);
 497     if (ret) {
 498         krb5_warn(context, ret, "krb5_get_init_creds_opt_alloc");
 499         goto out;
 500     }
 501
 502     krb5_get_init_creds_opt_set_default_flags(context, "kinit",
 503         krb5_principal_get_realm(context, principal), opt);
 504
 505     if (forwardable_flag != -1)
 506         krb5_get_init_creds_opt_set_forwardable(opt, forwardable_flag);
 507     if (proxiable_flag != -1)
 508         krb5_get_init_creds_opt_set_proxiable(opt, proxiable_flag);
 509     if (anonymous_flag)
 510         krb5_get_init_creds_opt_set_anonymous(opt, anonymous_flag);
 511     if (pac_flag != -1)
 512         krb5_get_init_creds_opt_set_pac_request(context, opt,
 513                                                 pac_flag ? TRUE : FALSE);
 514     if (canonicalize_flag)
 515         krb5_get_init_creds_opt_set_canonicalize(context, opt, TRUE);
 516     if (pk_enterprise_flag || enterprise_flag || canonicalize_flag || windows_flag)
 517         krb5_get_init_creds_opt_set_win2k(context, opt, TRUE);
 518     if (pk_user_id || ent_user_id || anonymous_flag) {
 519         ret = krb5_get_init_creds_opt_set_pkinit(context, opt,
 520                                                  principal,
 521                                                  pk_user_id,
 522                                                  pk_x509_anchors,
 523                                                  NULL,
 524                                                  NULL,
 525                                                  pk_use_enckey ? 2 : 0 |
 526                                                  anonymous_flag ? 4 : 0,
 527                                                  prompter,
 528                                                  NULL,
 529                                                  passwd);
 530         if (ret) {
 531             krb5_warn(context, ret, "krb5_get_init_creds_opt_set_pkinit");
 532             goto out;
 533         }
 534         if (ent_user_id)
 535             krb5_get_init_creds_opt_set_pkinit_user_certs(context, opt, ent_user_id);
 536     }
 537
 538     if (addrs_flag != -1)
 539         krb5_get_init_creds_opt_set_addressless(context, opt,
 540                                                 addrs_flag ? FALSE : TRUE);
 541
 542     if (renew_life == NULL && renewable_flag)
 543         renewstr = "1 month";
 544     if (renew_life)
 545         renewstr = renew_life;
 546     if (renewstr) {
 547         renew = parse_time(renewstr, "s");
 548         if (renew < 0)
 549             errx(1, "unparsable time: %s", renewstr);
 550
 551         krb5_get_init_creds_opt_set_renew_life(opt, renew);
 552     }
 553
 554     if (ticket_life != 0)
 555         krb5_get_init_creds_opt_set_tkt_life(opt, ticket_life);
 556
 557     if (start_str) {
 558         int tmp = parse_time(start_str, "s");
 559         if (tmp < 0)
 560             errx(1, N_("unparsable time: %s", ""), start_str);
 561
 562         start_time = tmp;
 563     }
 564
 565     if (etype_str.num_strings) {
 566         int i;
 567
 568         enctype = malloc(etype_str.num_strings * sizeof(*enctype));
 569         if (enctype == NULL)
 570             errx(1, "out of memory");
 571         for(i = 0; i < etype_str.num_strings; i++) {
 572             ret = krb5_string_to_enctype(context,
 573                                          etype_str.strings[i],
 574                                          &enctype[i]);
 575             if (ret)
 576                 errx(1, "unrecognized enctype: %s", etype_str.strings[i]);
 577         }
 578         krb5_get_init_creds_opt_set_etype_list(opt, enctype,
 579                                                etype_str.num_strings);
 580     }
 581
 582     ret = krb5_init_creds_init(context, principal, prompter, NULL, start_time, opt, &ctx);
 583     if (ret) {
 584         krb5_warn(context, ret, "krb5_init_creds_init");
 585         goto out;
 586     }
 587
 588     if (server_str) {
 589         ret = krb5_init_creds_set_service(context, ctx, server_str);
 590         if (ret) {
 591             krb5_warn(context, ret, "krb5_init_creds_set_service");
 592             goto out;
 593         }
 594     }
 595
 596     if (fast_armor_cache_string) {
 597         krb5_ccache fastid;
 598
 599         ret = krb5_cc_resolve(context, fast_armor_cache_string, &fastid);
 600         if (ret) {
 601             krb5_warn(context, ret, "krb5_cc_resolve(FAST cache)");
 602             goto out;
 603         }
 604
 605         ret = krb5_init_creds_set_fast_ccache(context, ctx, fastid);
 606         if (ret) {
 607             krb5_warn(context, ret, "krb5_init_creds_set_fast_ccache");
 608             goto out;
 609         }
 610     }
 611
 612     if (use_keytab || keytab_str) {
 613         ret = krb5_init_creds_set_keytab(context, ctx, kt);
 614         if (ret) {
 615             krb5_warn(context, ret, "krb5_init_creds_set_keytab");
 616             goto out;
 617         }
 618     } else if (pk_user_id || ent_user_id || anonymous_flag) {
 619
 620     } else if (!interactive && passwd[0] == '\0') {
 621         static int already_warned = 0;
 622
 623         if (!already_warned)
 624             krb5_warnx(context, "Not interactive, failed to get "
 625               "initial ticket");
 626         krb5_get_init_creds_opt_free(context, opt);
 627         already_warned = 1;
 628         return 0;
 629     } else {
 630
 631         if (passwd[0] == '\0') {
 632             char *p, *prompt;
 633             int aret = 0;
 634
 635             ret = krb5_unparse_name(context, principal, &p);
 636             if (!ret) {
 637                 aret = asprintf(&prompt, N_("%s's Password: ", ""), p);
 638                 free(p);
 639             }
 640             if (ret || aret == -1)
 641                 errx(1, "failed to generate passwd prompt: not enough memory");
 642
 643             if (UI_UTIL_read_pw_string(passwd, sizeof(passwd)-1, prompt, 0)){
 644                 memset(passwd, 0, sizeof(passwd));
 645                 errx(1, "failed to read password");
 646             }
 647             free(prompt);
 648         }
 649
 650         if (passwd[0]) {
 651             ret = krb5_init_creds_set_password(context, ctx, passwd);
 652             if (ret) {
 653                 krb5_warn(context, ret, "krb5_init_creds_set_password");
 654                 goto out;
 655             }
 656         }
 657     }
 658
 659     ret = krb5_init_creds_get(context, ctx);
 660
 661 #ifndef NO_NTLM
 662     if (ntlm_domain && passwd[0])
 663         heim_ntlm_nt_key(passwd, &ntlmkey);
 664 #endif
 665     memset(passwd, 0, sizeof(passwd));
 666
 667     switch(ret){
 668     case 0:
 669         break;
 670     case KRB5_LIBOS_PWDINTR: /* don't print anything if it was just C-c:ed */
 671         exit(1);
 672     case KRB5KRB_AP_ERR_BAD_INTEGRITY:
 673     case KRB5KRB_AP_ERR_MODIFIED:
 674     case KRB5KDC_ERR_PREAUTH_FAILED:
 675     case KRB5_GET_IN_TKT_LOOP:
 676         krb5_warnx(context, N_("Password incorrect", ""));
 677         goto out;
 678     case KRB5KRB_AP_ERR_V4_REPLY:
 679         krb5_warnx(context, N_("Looks like a Kerberos 4 reply", ""));
 680         goto out;
 681     default:
 682         krb5_warn(context, ret, "krb5_get_init_creds");
 683         goto out;
 684     }
 685
 686     krb5_process_last_request(context, opt, ctx);
 687
 688     ret = krb5_init_creds_get_creds(context, ctx, &cred);
 689     if (ret) {
 690         krb5_warn(context, ret, "krb5_init_creds_get_creds");
 691         goto out;
 692     }
 693
 694     if (ticket_life != 0) {
 695         if (abs(cred.times.endtime - cred.times.starttime - ticket_life) > 30) {
 696             char life[64];
 697             unparse_time_approx(cred.times.endtime - cred.times.starttime,
 698                                 life, sizeof(life));
 699             krb5_warnx(context, N_("NOTICE: ticket lifetime is %s", ""), life);
 700         }
 701     }
 702     if (renew_life) {
 703         if (abs(cred.times.renew_till - cred.times.starttime - renew) > 30) {
 704             char life[64];
 705             unparse_time_approx(cred.times.renew_till - cred.times.starttime,
 706                                 life, sizeof(life));
 707             krb5_warnx(context,
 708                        N_("NOTICE: ticket renewable lifetime is %s", ""),
 709                        life);
 710         }
 711     }
 712
 713     ret = krb5_cc_new_unique(context, krb5_cc_get_type(context, ccache),
 714                              NULL, &tempccache);
 715     if (ret) {
 716         krb5_warn(context, ret, "krb5_cc_new_unique");
 717         goto out;
 718     }
 719
 720     ret = krb5_init_creds_store(context, ctx, tempccache);
 721     if (ret) {
 722         krb5_warn(context, ret, "krb5_init_creds_store");
 723         goto out;
 724     }
 725
 726     krb5_init_creds_free(context, ctx);
 727     ctx = NULL;
 728
 729     ret = krb5_cc_move(context, tempccache, ccache);
 730     if (ret) {
 731         krb5_warn(context, ret, "krb5_cc_move");
 732         goto out;
 733     }
 734     tempccache = NULL;
 735
 736     if (switch_cache_flags)
 737         krb5_cc_switch(context, ccache);
 738
 739 #ifndef NO_NTLM
 740     if (ntlm_domain && ntlmkey.data)
 741         store_ntlmkey(context, ccache, ntlm_domain, &ntlmkey);
 742 #endif
 743
 744     if (ok_as_delegate_flag || windows_flag || use_referrals_flag) {
 745         unsigned char d = 0;
 746         krb5_data data;
 747
 748         if (ok_as_delegate_flag || windows_flag)
 749             d |= 1;
 750         if (use_referrals_flag || windows_flag)
 751             d |= 2;
 752
 753         data.length = 1;
 754         data.data = &d;
 755
 756         krb5_cc_set_config(context, ccache, NULL, "realm-config", &data);
 757     }
 758
 759 out:
 760     krb5_get_init_creds_opt_free(context, opt);
 761     if (ctx)
 762         krb5_init_creds_free(context, ctx);
 763     if (tempccache)
 764         krb5_cc_close(context, tempccache);
 765
 766     if (enctype)
 767         free(enctype);
 768
 769     return ret;
 770 }
 771
 772 static time_t
 773 ticket_lifetime(krb5_context context, krb5_ccache cache, krb5_principal client,
 774                 const char *server, time_t *renew)
 775 {
 776     krb5_creds in_cred, *cred;
 777     krb5_error_code ret;
 778     time_t timeout;
 779     time_t curtime;
 780
 781     memset(&in_cred, 0, sizeof(in_cred));
 782
 783     ret = krb5_cc_get_principal(context, cache, &in_cred.client);
 784     if (ret) {
 785         krb5_warn(context, ret, "krb5_cc_get_principal");
 786         return 0;
 787     }
 788     ret = get_server(context, in_cred.client, server, &in_cred.server);
 789     if (ret) {
 790         krb5_free_principal(context, in_cred.client);
 791         krb5_warn(context, ret, "get_server");
 792         return 0;
 793     }
 794
 795     ret = krb5_get_credentials(context, KRB5_GC_CACHED,
 796                                cache, &in_cred, &cred);
 797     krb5_free_principal(context, in_cred.client);
 798     krb5_free_principal(context, in_cred.server);
 799     if (ret) {
 800         krb5_warn(context, ret, "krb5_get_credentials");
 801         return 0;
 802     }
 803     curtime = time(NULL);
 804     timeout = cred->times.endtime - curtime;
 805     if (timeout < 0)
 806         timeout = 0;
 807     if (renew) {
 808         *renew = cred->times.renew_till - curtime;
 809         if (*renew < 0)
 810             *renew = 0;
 811     }
 812     krb5_free_creds(context, cred);
 813     return timeout;
 814 }
 815
 816 struct renew_ctx {
 817     krb5_context context;
 818     krb5_ccache  ccache;
 819     krb5_principal principal;
 820     krb5_deltat ticket_life;
 821 };
 822
 823 static time_t
 824 renew_func(void *ptr)
 825 {
 826     krb5_error_code ret;
 827     struct renew_ctx *ctx = ptr;
 828     time_t expire;
 829     time_t renew_expire;
 830     static time_t exp_delay = 1;
 831
 832     /*
 833      * NOTE: We count on the ccache implementation to notice changes to the
 834      * actual ccache filesystem/whatever objects.  There should be no ccache
 835      * types for which this is not the case, but it might not hurt to
 836      * re-krb5_cc_resolve() after each successful renew_validate()/
 837      * get_new_tickets() call.
 838      */
 839
 840     expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
 841                              server_str, &renew_expire);
 842
 843     if (renew_expire > expire) {
 844         ret = renew_validate(ctx->context, 1, validate_flag, ctx->ccache,
 845                        server_str, ctx->ticket_life);
 846         expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
 847                                  server_str, &renew_expire);
 848     }
 849
 850     if (expire < ctx->ticket_life / 2) {
 851         ret = get_new_tickets(ctx->context, ctx->principal,
 852                         ctx->ccache, ctx->ticket_life, 0);
 853         expire = ticket_lifetime(ctx->context, ctx->ccache, ctx->principal,
 854                                  server_str, &renew_expire);
 855     }
 856
 857 #ifndef NO_AFS
 858     if (ret == 0 && server_str == NULL && do_afslog && k_hasafs())
 859         krb5_afslog(ctx->context, ctx->ccache, NULL, NULL);
 860 #endif
 861
 862     /*
 863      * If our tickets have expired and we been able to either renew them
 864      * or obtain new tickets, then we still call this function but we use
 865      * an exponential backoff.  This should take care of the case where
 866      * we are using stored credentials but the KDC has been unavailable
 867      * for some reason...
 868      */
 869
 870     if (expire < 1) {
 871         /*
 872          * We can't ask to keep spamming stderr but not syslog, so we warn
 873          * only once.
 874          */
 875         if (exp_delay == 1) {
 876             krb5_warnx(ctx->context, N_("NOTICE: Could not renew/refresh "
 877                                         "tickets", ""));
 878         }
 879         if (exp_delay < 7200)
 880             exp_delay += exp_delay / 2 + 1;
 881         return exp_delay;
 882     }
 883     exp_delay = 1;
 884
 885     return expire / 2 + 1;
 886 }
 887
 888 static void
 889 set_princ_realm(krb5_context context,
 890                 krb5_principal principal,
 891                 const char *realm)
 892 {
 893     krb5_error_code ret;
 894
 895     if ((ret = krb5_principal_set_realm(context, principal, realm)) != 0)
 896         krb5_err(context, 1, ret, "krb5_principal_set_realm");
 897 }
 898
 899 static void
 900 parse_name_realm(krb5_context context,
 901                  const char *name,
 902                  int flags,
 903                  const char *realm,
 904                  krb5_principal *princ)
 905 {
 906     krb5_error_code ret;
 907
 908     if (realm)
 909         flags |= KRB5_PRINCIPAL_PARSE_NO_DEF_REALM;
 910     if ((ret = krb5_parse_name_flags(context, name, flags, princ)) != 0)
 911         krb5_err(context, 1, ret, "krb5_parse_name_flags");
 912     if (realm && krb5_principal_get_realm(context, *princ) == NULL)
 913         set_princ_realm(context, *princ, realm);
 914 }
 915
 916 static char *
 917 get_default_realm(krb5_context context)
 918 {
 919     char *realm;
 920     krb5_error_code ret;
 921
 922     if ((ret = krb5_get_default_realm(context, &realm)) != 0)
 923         krb5_err(context, 1, ret, "krb5_get_default_realm");
 924     return realm;
 925 }
 926
 927 static void
 928 get_default_principal(krb5_context context, krb5_principal *princ)
 929 {
 930     krb5_error_code ret;
 931
 932     if ((ret = krb5_get_default_principal(context, princ)) != 0)
 933         krb5_err(context, 1, ret, "krb5_get_default_principal");
 934 }
 935
 936 static char *
 937 get_user_realm(krb5_context context)
 938 {
 939     krb5_error_code ret;
 940     char *user_realm = NULL;
 941
 942     /*
 943      * If memory allocation fails, we don't try to use the wrong realm,
 944      * that will trigger misleading error messages complicate support.
 945      */
 946     krb5_appdefault_string(context, "kinit", NULL, "user_realm", "",
 947                            &user_realm);
 948     if (user_realm == NULL) {
 949         ret = krb5_enomem(context);
 950         krb5_err(context, 1, ret, "krb5_appdefault_string");
 951     }
 952
 953     if (*user_realm == 0) {
 954         free(user_realm);
 955         user_realm = NULL;
 956     }
 957
 958     return user_realm;
 959 }
 960
 961 static void
 962 get_princ(krb5_context context, krb5_principal *principal, const char *name)
 963 {
 964     krb5_error_code ret;
 965     krb5_principal tmp;
 966     int parseflags = 0;
 967     char *user_realm;
 968
 969     if (name == NULL) {
 970         krb5_ccache ccache;
 971
 972         /* If credential cache provides a client principal, use that. */
 973         if (krb5_cc_default(context, &ccache) == 0) {
 974             ret = krb5_cc_get_principal(context, ccache, principal);
 975             krb5_cc_close(context, ccache);
 976             if (ret == 0)
 977                 return;
 978         }
 979     }
 980
 981     user_realm = get_user_realm(context);
 982
 983     if (name) {
 984         if (canonicalize_flag || enterprise_flag)
 985             parseflags |= KRB5_PRINCIPAL_PARSE_ENTERPRISE;
 986
 987         parse_name_realm(context, name, parseflags, user_realm, &tmp);
 988
 989         if (user_realm && krb5_principal_get_num_comp(context, tmp) > 1) {
 990             /* Principal is instance qualified, reparse with default realm. */
 991             krb5_free_principal(context, tmp);
 992             parse_name_realm(context, name, parseflags, NULL, principal);
 993         } else {
 994             *principal = tmp;
 995         }
 996     } else {
 997         get_default_principal(context, principal);
 998         if (user_realm)
 999             set_princ_realm(context, *principal, user_realm);
1000     }
1001
1002     if (user_realm)
1003         free(user_realm);
1004 }
1005
1006 static void
1007 get_princ_kt(krb5_context context,
1008              krb5_principal *principal,
1009              char *name)
1010 {
1011     krb5_error_code ret;
1012     krb5_principal tmp;
1013     krb5_ccache ccache;
1014     krb5_kt_cursor cursor;
1015     krb5_keytab_entry entry;
1016     int parseflags = 0;
1017     char *def_realm;
1018
1019     if (name == NULL) {
1020         /*
1021          * If the credential cache exists and specifies a client principal,
1022          * use that.
1023          */
1024         if (krb5_cc_default(context, &ccache) == 0) {
1025             ret = krb5_cc_get_principal(context, ccache, principal);
1026             krb5_cc_close(context, ccache);
1027             if (ret == 0)
1028                 return;
1029         }
1030     }
1031
1032     if (name) {
1033         /* If the principal specifies an explicit realm, just use that. */
1034         parseflags |= KRB5_PRINCIPAL_PARSE_NO_DEF_REALM;
1035         parse_name_realm(context, name, parseflags, NULL, &tmp);
1036         if (krb5_principal_get_realm(context, tmp) != NULL) {
1037             *principal = tmp;
1038             return;
1039         }
1040     } else {
1041         /* Otherwise, search keytab for bare name of the default principal. */
1042         get_default_principal(context, &tmp);
1043         set_princ_realm(context, tmp, NULL);
1044     }
1045
1046     def_realm = get_default_realm(context);
1047
1048     ret = krb5_kt_start_seq_get(context, kt, &cursor);
1049     if (ret)
1050         krb5_err(context, 1, ret, "krb5_kt_start_seq_get");
1051
1052     while (ret == 0 &&
1053            krb5_kt_next_entry(context, kt, &entry, &cursor) == 0) {
1054         const char *realm;
1055
1056         if (!krb5_principal_compare_any_realm(context, tmp, entry.principal))
1057             continue;
1058         if (*principal &&
1059             krb5_principal_compare(context, *principal, entry.principal))
1060             continue;
1061         /* The default realm takes precedence */
1062         realm = krb5_principal_get_realm(context, entry.principal);
1063         if (*principal && strcmp(def_realm, realm) == 0) {
1064             krb5_free_principal(context, *principal);
1065             ret = krb5_copy_principal(context, entry.principal, principal);
1066             break;
1067         }
1068         if (!*principal)
1069             ret = krb5_copy_principal(context, entry.principal, principal);
1070     }
1071     if (ret != 0 || (ret = krb5_kt_end_seq_get(context, kt, &cursor)) != 0)
1072         krb5_err(context, 1, ret, "get_princ_kt");
1073     if (!*principal)
1074         parse_name_realm(context, name, parseflags, NULL, principal);
1075
1076     krb5_free_principal(context, tmp);
1077     free(def_realm);
1078 }
1079
1080 int
1081 main(int argc, char **argv)
1082 {
1083     krb5_error_code ret;
1084     krb5_context context;
1085     krb5_ccache  ccache;
1086     krb5_principal principal = NULL;
1087     int optidx = 0;
1088     krb5_deltat ticket_life = 0;
1089
1090     setprogname(argv[0]);
1091
1092     setlocale(LC_ALL, "");
1093     bindtextdomain("heimdal_kuser", HEIMDAL_LOCALEDIR);
1094     textdomain("heimdal_kuser");
1095
1096     ret = krb5_init_context(&context);
1097     if (ret == KRB5_CONFIG_BADFORMAT)
1098         errx(1, "krb5_init_context failed to parse configuration file");
1099     else if (ret)
1100         errx(1, "krb5_init_context failed: %d", ret);
1101
1102     if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
1103         usage(1);
1104
1105     if (help_flag)
1106         usage(0);
1107
1108     if (version_flag) {
1109         print_version(NULL);
1110         exit(0);
1111     }
1112
1113     argc -= optidx;
1114     argv += optidx;
1115
1116     /*
1117      * Open the keytab now, we use the keytab to determine the principal's
1118      * realm when the requested principal has no realm.
1119      */
1120     if (use_keytab || keytab_str) {
1121         if (keytab_str)
1122             ret = krb5_kt_resolve(context, keytab_str, &kt);
1123         else
1124             ret = krb5_kt_default(context, &kt);
1125         if (ret)
1126             krb5_err(context, 1, ret, "resolving keytab");
1127     }
1128
1129     if (pk_enterprise_flag) {
1130         ret = krb5_pk_enterprise_cert(context, pk_user_id,
1131                                       argv[0], &principal,
1132                                       &ent_user_id);
1133         if (ret)
1134             krb5_err(context, 1, ret, "krb5_pk_enterprise_certs");
1135
1136         pk_user_id = NULL;
1137
1138     } else if (anonymous_flag) {
1139
1140         ret = krb5_make_principal(context, &principal, argv[0],
1141                                   KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME,
1142                                   NULL);
1143         if (ret)
1144             krb5_err(context, 1, ret, "krb5_make_principal");
1145         krb5_principal_set_type(context, principal, KRB5_NT_WELLKNOWN);
1146
1147     } else if (use_keytab || keytab_str) {
1148         get_princ_kt(context, &principal, argv[0]);
1149     } else {
1150         get_princ(context, &principal, argv[0]);
1151     }
1152
1153     if (fcache_version)
1154         krb5_set_fcache_version(context, fcache_version);
1155
1156     if (renewable_flag == -1)
1157         /* this seems somewhat pointless, but whatever */
1158         krb5_appdefault_boolean(context, "kinit",
1159                                 krb5_principal_get_realm(context, principal),
1160                                 "renewable", FALSE, &renewable_flag);
1161     if (do_afslog == -1)
1162         krb5_appdefault_boolean(context, "kinit",
1163                                 krb5_principal_get_realm(context, principal),
1164                                 "afslog", TRUE, &do_afslog);
1165
1166     if (cred_cache)
1167         ret = krb5_cc_resolve(context, cred_cache, &ccache);
1168     else {
1169         if (argc > 1) {
1170             char s[1024];
1171             ret = krb5_cc_new_unique(context, NULL, NULL, &ccache);
1172             if (ret)
1173                 krb5_err(context, 1, ret, "creating cred cache");
1174             snprintf(s, sizeof(s), "%s:%s",
1175                      krb5_cc_get_type(context, ccache),
1176                      krb5_cc_get_name(context, ccache));
1177             setenv("KRB5CCNAME", s, 1);
1178         } else {
1179             ret = krb5_cc_cache_match(context, principal, &ccache);
1180             if (ret) {
1181                 const char *type;
1182                 ret = krb5_cc_default(context, &ccache);
1183                 if (ret)
1184                     krb5_err(context, 1, ret,
1185                              N_("resolving credentials cache", ""));
1186
1187                 /*
1188                  * Check if the type support switching, and we do,
1189                  * then do that instead over overwriting the current
1190                  * default credential
1191                  */
1192                 type = krb5_cc_get_type(context, ccache);
1193                 if (krb5_cc_support_switch(context, type)) {
1194                     krb5_cc_close(context, ccache);
1195                     ret = krb5_cc_new_unique(context, type, NULL, &ccache);
1196                 }
1197             }
1198         }
1199     }
1200     if (ret)
1201         krb5_err(context, 1, ret, N_("resolving credentials cache", ""));
1202
1203 #ifndef NO_AFS
1204     if (argc > 1 && k_hasafs())
1205         k_setpag();
1206 #endif
1207
1208     if (lifetime) {
1209         int tmp = parse_time(lifetime, "s");
1210         if (tmp < 0)
1211             errx(1, N_("unparsable time: %s", ""), lifetime);
1212
1213         ticket_life = tmp;
1214     }
1215
1216     if (addrs_flag == 0 && extra_addresses.num_strings > 0)
1217         krb5_errx(context, 1,
1218                   N_("specifying both extra addresses and "
1219                      "no addresses makes no sense", ""));
1220     {
1221         int i;
1222         krb5_addresses addresses;
1223         memset(&addresses, 0, sizeof(addresses));
1224         for(i = 0; i < extra_addresses.num_strings; i++) {
1225             ret = krb5_parse_address(context, extra_addresses.strings[i],
1226                                      &addresses);
1227             if (ret == 0) {
1228                 krb5_add_extra_addresses(context, &addresses);
1229                 krb5_free_addresses(context, &addresses);
1230             }
1231         }
1232         free_getarg_strings(&extra_addresses);
1233     }
1234
1235     if (renew_flag || validate_flag) {
1236         ret = renew_validate(context, renew_flag, validate_flag,
1237                              ccache, server_str, ticket_life);
1238
1239 #ifndef NO_AFS
1240         if (ret == 0 && server_str == NULL && do_afslog && k_hasafs())
1241             krb5_afslog(context, ccache, NULL, NULL);
1242 #endif
1243
1244         exit(ret != 0);
1245     }
1246
1247     ret = get_new_tickets(context, principal, ccache, ticket_life, 1);
1248     if (ret)
1249         exit(1);
1250
1251 #ifndef NO_AFS
1252     if (ret == 0 && server_str == NULL && do_afslog && k_hasafs())
1253         krb5_afslog(context, ccache, NULL, NULL);
1254 #endif
1255
1256     if (argc > 1) {
1257         struct renew_ctx ctx;
1258         time_t timeout;
1259
1260         timeout = ticket_lifetime(context, ccache, principal,
1261                                   server_str, NULL) / 2;
1262
1263         ctx.context = context;
1264         ctx.ccache = ccache;
1265         ctx.principal = principal;
1266         ctx.ticket_life = ticket_life;
1267
1268         ret = simple_execvp_timed(argv[1], argv+1,
1269                                   renew_func, &ctx, timeout);
1270 #define EX_NOEXEC       126
1271 #define EX_NOTFOUND     127
1272         if (ret == EX_NOEXEC)
1273             krb5_warnx(context, N_("permission denied: %s", ""), argv[1]);
1274         else if (ret == EX_NOTFOUND)
1275             krb5_warnx(context, N_("command not found: %s", ""), argv[1]);
1276
1277         krb5_cc_destroy(context, ccache);
1278 #ifndef NO_AFS
1279         if (k_hasafs())
1280             k_unlog();
1281 #endif
1282     } else {
1283         krb5_cc_close(context, ccache);
1284         ret = 0;
1285     }
1286     krb5_free_principal(context, principal);
1287     if (kt)
1288         krb5_kt_close(context, kt);
1289     krb5_free_context(context);
1290     return ret;
1291 }