kdc/config.c

   1 /*
   2  * Copyright (c) 1997-2004 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 "kdc_locl.h"
  35 #include <getarg.h>
  36 #include <parse_bytes.h>
  37
  38 RCSID("$Id$");
  39
  40 static const char *config_file; /* location of kdc config file */
  41
  42 int require_preauth = -1;       /* 1 == require preauth for all principals */
  43
  44 size_t max_request;             /* maximal size of a request */
  45
  46 static char *max_request_str;   /* `max_request' as a string */
  47
  48 time_t kdc_warn_pwexpire;       /* time before expiration to print a warning */
  49
  50 struct dbinfo *databases;
  51 HDB **db;
  52 int num_db;
  53
  54 const char *port_str;
  55
  56 #ifdef HAVE_DAEMON
  57 int detach_from_console = -1;
  58 #define DETACH_IS_DEFAULT FALSE
  59 #endif
  60
  61 int enable_http = -1;
  62 krb5_boolean encode_as_rep_as_tgs_rep; /* bug compatibility */
  63
  64 krb5_boolean check_ticket_addresses;
  65 krb5_boolean allow_null_ticket_addresses;
  66 krb5_boolean allow_anonymous;
  67 int trpolicy;
  68 static const char *trpolicy_str;
  69
  70 static struct getarg_strings addresses_str;     /* addresses to listen on */
  71 krb5_addresses explicit_addresses;
  72
  73 static int disable_des = -1;
  74
  75 #ifdef KRB4
  76 char *v4_realm;
  77 int enable_v4 = -1;
  78 int enable_kaserver = -1;
  79 #endif
  80
  81 int enable_524 = -1;
  82 int enable_v4_cross_realm = -1;
  83
  84 static int builtin_hdb_flag;
  85 static int help_flag;
  86 static int version_flag;
  87
  88 static struct getargs args[] = {
  89     {
  90         "config-file",  'c',    arg_string,     &config_file,
  91         "location of config file",      "file"
  92     },
  93     {
  94         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  95         "don't require pa-data in as-reqs"
  96     },
  97     {
  98         "max-request",  0,      arg_string, &max_request,
  99         "max size for a kdc-request", "size"
 100     },
 101 #if 0
 102     {
 103         "database",     'd',    arg_string, &databases,
 104         "location of database", "database"
 105     },
 106 #endif
 107     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support" },
 108     {   "524",          0,      arg_negative_flag, &enable_524,
 109         "don't respond to 524 requests"
 110     },
 111 #ifdef KRB4
 112     {
 113         "kaserver", 'K', arg_flag,   &enable_kaserver,
 114         "enable kaserver support"
 115     },
 116     {   "kerberos4",    0,      arg_flag, &enable_v4,
 117         "respond to kerberos 4 requests"
 118     },
 119     {
 120         "v4-realm",     'r',    arg_string, &v4_realm,
 121         "realm to serve v4-requests for"
 122     },
 123 #endif
 124     {   "kerberos4-cross-realm",        0,      arg_flag,
 125         &enable_v4_cross_realm,
 126         "respond to kerberos 4 requests from foreign realms"
 127     },
 128     {   "ports",        'P',    arg_string, &port_str,
 129         "ports to listen to", "portspec"
 130     },
 131 #ifdef HAVE_DAEMON
 132 #if DETACH_IS_DEFAULT
 133     {
 134         "detach",       'D',      arg_negative_flag, &detach_from_console,
 135         "don't detach from console"
 136     },
 137 #else
 138     {
 139         "detach",       0 ,      arg_flag, &detach_from_console,
 140         "detach from console"
 141     },
 142 #endif
 143 #endif
 144     {   "addresses",    0,      arg_strings, &addresses_str,
 145         "addresses to listen on", "list of addresses" },
 146     {   "disable-des",  0,      arg_flag, &disable_des,
 147         "disable DES" },
 148     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 149         "list builtin hdb backends"},
 150     {   "help",         'h',    arg_flag,   &help_flag },
 151     {   "version",      'v',    arg_flag,   &version_flag }
 152 };
 153
 154 static int num_args = sizeof(args) / sizeof(args[0]);
 155
 156 static void
 157 usage(int ret)
 158 {
 159     arg_printusage (args, num_args, NULL, "");
 160     exit (ret);
 161 }
 162
 163 static void
 164 get_dbinfo(void)
 165 {
 166     const krb5_config_binding *top_binding = NULL;
 167     const krb5_config_binding *db_binding;
 168     const krb5_config_binding *default_binding = NULL;
 169     struct dbinfo *di, **dt;
 170     const char *default_dbname = HDB_DEFAULT_DB;
 171     const char *default_mkey = HDB_DB_DIR "/m-key";
 172     const char *p;
 173
 174     databases = NULL;
 175     dt = &databases;
 176     while((db_binding = (const krb5_config_binding *)
 177            krb5_config_get_next(context, NULL, &top_binding,
 178                                 krb5_config_list,
 179                                 "kdc",
 180                                 "database",
 181                                 NULL))) {
 182         p = krb5_config_get_string(context, db_binding, "realm", NULL);
 183         if(p == NULL) {
 184             if(default_binding) {
 185                 krb5_warnx(context, "WARNING: more than one realm-less "
 186                            "database specification");
 187                 krb5_warnx(context, "WARNING: using the first encountered");
 188             } else
 189                 default_binding = db_binding;
 190             continue;
 191         }
 192         di = calloc(1, sizeof(*di));
 193         di->realm = strdup(p);
 194         p = krb5_config_get_string(context, db_binding, "dbname", NULL);
 195         if(p)
 196             di->dbname = strdup(p);
 197         p = krb5_config_get_string(context, db_binding, "mkey_file", NULL);
 198         if(p)
 199             di->mkey_file = strdup(p);
 200         *dt = di;
 201         dt = &di->next;
 202     }
 203     if(default_binding) {
 204         di = calloc(1, sizeof(*di));
 205         p = krb5_config_get_string(context, default_binding, "dbname", NULL);
 206         if(p) {
 207             di->dbname = strdup(p);
 208             default_dbname = p;
 209         }
 210         p = krb5_config_get_string(context, default_binding, "mkey_file", NULL);
 211         if(p) {
 212             di->mkey_file = strdup(p);
 213             default_mkey = p;
 214         }
 215         *dt = di;
 216         dt = &di->next;
 217     } else if(databases == NULL) {
 218         /* if there are none specified, use some default */
 219         di = calloc(1, sizeof(*di));
 220         di->dbname = strdup(default_dbname);
 221         di->mkey_file = strdup(default_mkey);
 222         *dt = di;
 223         dt = &di->next;
 224     }
 225     for(di = databases; di; di = di->next) {
 226         if(di->dbname == NULL)
 227             di->dbname = strdup(default_dbname);
 228         if(di->mkey_file == NULL) {
 229             p = strrchr(di->dbname, '.');
 230             if(p == NULL || strchr(p, '/') != NULL)
 231                 /* final pathname component does not contain a . */
 232                 asprintf(&di->mkey_file, "%s.mkey", di->dbname);
 233             else
 234                 /* the filename is something.else, replace .else with
 235                    .mkey */
 236                 asprintf(&di->mkey_file, "%.*s.mkey",
 237                          (int)(p - di->dbname), di->dbname);
 238         }
 239     }
 240 }
 241
 242 static void
 243 add_one_address (const char *str, int first)
 244 {
 245     krb5_error_code ret;
 246     krb5_addresses tmp;
 247
 248     ret = krb5_parse_address (context, str, &tmp);
 249     if (ret)
 250         krb5_err (context, 1, ret, "parse_address `%s'", str);
 251     if (first)
 252         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 253     else
 254         krb5_append_addresses(context, &explicit_addresses, &tmp);
 255     krb5_free_addresses (context, &tmp);
 256 }
 257
 258 void
 259 configure(int argc, char **argv)
 260 {
 261     krb5_error_code ret;
 262     int optind = 0;
 263     const char *p;
 264
 265     while(getarg(args, num_args, argc, argv, &optind))
 266         warnx("error at argument `%s'", argv[optind]);
 267
 268     if(help_flag)
 269         usage (0);
 270
 271     if (version_flag) {
 272         print_version(NULL);
 273         exit(0);
 274     }
 275
 276     if (builtin_hdb_flag) {
 277         char *list;
 278         ret = hdb_list_builtin(context, &list);
 279         if (ret)
 280             krb5_err(context, 1, ret, "listing builtin hdb backends");
 281         printf("builtin hdb backends: %s\n", list);
 282         free(list);
 283         exit(0);
 284     }
 285
 286     argc -= optind;
 287     argv += optind;
 288
 289     if (argc != 0)
 290         usage(1);
 291
 292     {
 293         char **files;
 294
 295         if(config_file == NULL)
 296             config_file = _PATH_KDC_CONF;
 297
 298         ret = krb5_prepend_config_files_default(config_file, &files);
 299         if (ret)
 300             krb5_err(context, 1, ret, "getting configuration files");
 301
 302         ret = krb5_set_config_files(context, files);
 303         krb5_free_config_files(files);
 304         if(ret)
 305             krb5_err(context, 1, ret, "reading configuration files");
 306     }
 307
 308     get_dbinfo();
 309
 310     if(max_request_str)
 311         max_request = parse_bytes(max_request_str, NULL);
 312
 313     if(max_request == 0){
 314         p = krb5_config_get_string (context,
 315                                     NULL,
 316                                     "kdc",
 317                                     "max-request",
 318                                     NULL);
 319         if(p)
 320             max_request = parse_bytes(p, NULL);
 321     }
 322
 323     if(require_preauth == -1)
 324         require_preauth = krb5_config_get_bool(context, NULL, "kdc",
 325                                                "require-preauth", NULL);
 326
 327     if(port_str == NULL){
 328         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 329         if (p != NULL)
 330             port_str = strdup(p);
 331     }
 332
 333     explicit_addresses.len = 0;
 334
 335     if (addresses_str.num_strings) {
 336         int i;
 337
 338         for (i = 0; i < addresses_str.num_strings; ++i)
 339             add_one_address (addresses_str.strings[i], i == 0);
 340         free_getarg_strings (&addresses_str);
 341     } else {
 342         char **foo = krb5_config_get_strings (context, NULL,
 343                                               "kdc", "addresses", NULL);
 344
 345         if (foo != NULL) {
 346             add_one_address (*foo++, TRUE);
 347             while (*foo)
 348                 add_one_address (*foo++, FALSE);
 349         }
 350     }
 351
 352 #ifdef KRB4
 353     if(enable_v4 == -1)
 354         enable_v4 = krb5_config_get_bool_default(context, NULL, FALSE, "kdc",
 355                                                  "enable-kerberos4", NULL);
 356 #else
 357 #define enable_v4 0
 358 #endif
 359     if(enable_v4_cross_realm == -1)
 360         enable_v4_cross_realm =
 361             krb5_config_get_bool_default(context, NULL,
 362                                          FALSE, "kdc",
 363                                          "enable-kerberos4-cross-realm",
 364                                          NULL);
 365     if(enable_524 == -1)
 366         enable_524 = krb5_config_get_bool_default(context, NULL, enable_v4,
 367                                                   "kdc", "enable-524", NULL);
 368
 369     if(enable_http == -1)
 370         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 371                                            "enable-http", NULL);
 372     check_ticket_addresses =
 373         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 374                                      "check-ticket-addresses", NULL);
 375     allow_null_ticket_addresses =
 376         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 377                                      "allow-null-ticket-addresses", NULL);
 378
 379     allow_anonymous =
 380         krb5_config_get_bool(context, NULL, "kdc",
 381                              "allow-anonymous", NULL);
 382     trpolicy_str =
 383         krb5_config_get_string_default(context, NULL, "always-check", "kdc",
 384                                        "transited-policy", NULL);
 385     if(strcasecmp(trpolicy_str, "always-check") == 0)
 386         trpolicy = TRPOLICY_ALWAYS_CHECK;
 387     else if(strcasecmp(trpolicy_str, "allow-per-principal") == 0)
 388         trpolicy = TRPOLICY_ALLOW_PER_PRINCIPAL;
 389     else if(strcasecmp(trpolicy_str, "always-honour-request") == 0)
 390         trpolicy = TRPOLICY_ALWAYS_HONOUR_REQUEST;
 391     else {
 392         kdc_log(0, "unknown transited-policy: %s, reverting to always-check",
 393                 trpolicy_str);
 394         trpolicy = TRPOLICY_ALWAYS_CHECK;
 395     }
 396
 397     if (krb5_config_get_string(context, NULL, "kdc",
 398                                "enforce-transited-policy", NULL))
 399         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 400                   "use [kdc]transited-policy instead");
 401
 402 #ifdef KRB4
 403     if(v4_realm == NULL){
 404         p = krb5_config_get_string (context, NULL,
 405                                     "kdc",
 406                                     "v4-realm",
 407                                     NULL);
 408         if(p != NULL) {
 409             v4_realm = strdup(p);
 410             if (v4_realm == NULL)
 411                 krb5_errx(context, 1, "out of memory");
 412         }
 413     }
 414     if (enable_kaserver == -1)
 415         enable_kaserver = krb5_config_get_bool_default(context, NULL, FALSE,
 416                                                        "kdc",
 417                                                        "enable-kaserver",
 418                                                        NULL);
 419 #endif
 420
 421     encode_as_rep_as_tgs_rep = krb5_config_get_bool(context, NULL, "kdc",
 422                                                     "encode_as_rep_as_tgs_rep",
 423                                                     NULL);
 424
 425     kdc_warn_pwexpire = krb5_config_get_time (context, NULL,
 426                                               "kdc",
 427                                               "kdc_warn_pwexpire",
 428                                               NULL);
 429
 430 #ifdef HAVE_DAEMON
 431     if(detach_from_console == -1)
 432         detach_from_console = krb5_config_get_bool_default(context, NULL,
 433                                                            DETACH_IS_DEFAULT,
 434                                                            "kdc",
 435                                                            "detach", NULL);
 436 #endif
 437     kdc_openlog();
 438     if(max_request == 0)
 439         max_request = 64 * 1024;
 440     if(require_preauth == -1)
 441         require_preauth = 1;
 442     if (port_str == NULL)
 443         port_str = "+";
 444
 445 #ifdef PKINIT
 446     enable_pkinit = krb5_config_get_bool_default(context, NULL, FALSE,
 447                                                  "kdc",
 448                                                  "enable-pkinit",
 449                                                  NULL);
 450     if (enable_pkinit) {
 451         const char *user_id, *x509_anchors;
 452
 453         user_id = krb5_config_get_string(context, NULL,
 454                                           "kdc",
 455                                           "pki-identity",
 456                                           NULL);
 457         if (user_id == NULL)
 458             krb5_errx(context, 1, "pkinit enabled but no identity");
 459
 460         x509_anchors = krb5_config_get_string(context, NULL,
 461                                               "kdc",
 462                                               "pki-anchors",
 463                                               NULL);
 464         if (x509_anchors == NULL)
 465             krb5_errx(context, 1, "pkinit enabled but no X509 anchors");
 466
 467         pk_initialize(user_id, x509_anchors);
 468
 469         enable_pkinit_princ_in_cert =
 470             krb5_config_get_bool_default(context,
 471                                          NULL, TRUE,
 472                                          "kdc",
 473                                          "pkinit-principal-in-certificate",
 474                                          NULL);
 475     }
 476 #endif
 477
 478 #ifdef KRB4
 479     if(v4_realm == NULL){
 480         v4_realm = malloc(40); /* REALM_SZ */
 481         if (v4_realm == NULL)
 482             krb5_errx(context, 1, "out of memory");
 483         krb_get_lrealm(v4_realm, 1);
 484     }
 485 #endif
 486     if(disable_des == -1)
 487         disable_des = krb5_config_get_bool_default(context, NULL,
 488                                                    0,
 489                                                    "kdc",
 490                                                    "disable-des", NULL);
 491     if(disable_des) {
 492         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 493         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 494         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 495         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 496         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 497         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 498     }
 499 }