kdc/config.c

   1 /*
   2  * Copyright (c) 1997-2003 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 #ifdef KRB4
  74 char *v4_realm;
  75 int enable_v4 = -1;
  76 int enable_kaserver = -1;
  77 #endif
  78
  79 int enable_524 = -1;
  80 int enable_v4_cross_realm = -1;
  81
  82 static int help_flag;
  83 static int version_flag;
  84
  85 static struct getargs args[] = {
  86     {
  87         "config-file",  'c',    arg_string,     &config_file,
  88         "location of config file",      "file"
  89     },
  90     {
  91         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  92         "don't require pa-data in as-reqs"
  93     },
  94     {
  95         "max-request",  0,      arg_string, &max_request,
  96         "max size for a kdc-request", "size"
  97     },
  98 #if 0
  99     {
 100         "database",     'd',    arg_string, &databases,
 101         "location of database", "database"
 102     },
 103 #endif
 104     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support" },
 105     {   "524",          0,      arg_negative_flag, &enable_524,
 106         "don't respond to 524 requests"
 107     },
 108 #ifdef KRB4
 109     {
 110         "kaserver", 'K', arg_flag,   &enable_kaserver,
 111         "enable kaserver support"
 112     },
 113     {   "kerberos4",    0,      arg_flag, &enable_v4,
 114         "respond to kerberos 4 requests"
 115     },
 116     {
 117         "v4-realm",     'r',    arg_string, &v4_realm,
 118         "realm to serve v4-requests for"
 119     },
 120 #endif
 121     {   "kerberos4-cross-realm",        0,      arg_flag,
 122         &enable_v4_cross_realm,
 123         "respond to kerberos 4 requests from foreign realms"
 124     },
 125     {   "ports",        'P',    arg_string, &port_str,
 126         "ports to listen to", "portspec"
 127     },
 128 #ifdef HAVE_DAEMON
 129 #if DETACH_IS_DEFAULT
 130     {
 131         "detach",       'D',      arg_negative_flag, &detach_from_console,
 132         "don't detach from console"
 133     },
 134 #else
 135     {
 136         "detach",       0 ,      arg_flag, &detach_from_console,
 137         "detach from console"
 138     },
 139 #endif
 140 #endif
 141     {   "addresses",    0,      arg_strings, &addresses_str,
 142         "addresses to listen on", "list of addresses" },
 143     {   "help",         'h',    arg_flag,   &help_flag },
 144     {   "version",      'v',    arg_flag,   &version_flag }
 145 };
 146
 147 static int num_args = sizeof(args) / sizeof(args[0]);
 148
 149 static void
 150 usage(int ret)
 151 {
 152     arg_printusage (args, num_args, NULL, "");
 153     exit (ret);
 154 }
 155
 156 static void
 157 get_dbinfo(void)
 158 {
 159     const krb5_config_binding *top_binding = NULL;
 160     const krb5_config_binding *db_binding;
 161     const krb5_config_binding *default_binding = NULL;
 162     struct dbinfo *di, **dt;
 163     const char *default_dbname = HDB_DEFAULT_DB;
 164     const char *default_mkey = HDB_DB_DIR "/m-key";
 165     const char *p;
 166
 167     databases = NULL;
 168     dt = &databases;
 169     while((db_binding = (const krb5_config_binding *)
 170            krb5_config_get_next(context, NULL, &top_binding,
 171                                 krb5_config_list,
 172                                 "kdc",
 173                                 "database",
 174                                 NULL))) {
 175         p = krb5_config_get_string(context, db_binding, "realm", NULL);
 176         if(p == NULL) {
 177             if(default_binding) {
 178                 krb5_warnx(context, "WARNING: more than one realm-less "
 179                            "database specification");
 180                 krb5_warnx(context, "WARNING: using the first encountered");
 181             } else
 182                 default_binding = db_binding;
 183             continue;
 184         }
 185         di = calloc(1, sizeof(*di));
 186         di->realm = strdup(p);
 187         p = krb5_config_get_string(context, db_binding, "dbname", NULL);
 188         if(p)
 189             di->dbname = strdup(p);
 190         p = krb5_config_get_string(context, db_binding, "mkey_file", NULL);
 191         if(p)
 192             di->mkey_file = strdup(p);
 193         *dt = di;
 194         dt = &di->next;
 195     }
 196     if(default_binding) {
 197         di = calloc(1, sizeof(*di));
 198         p = krb5_config_get_string(context, default_binding, "dbname", NULL);
 199         if(p) {
 200             di->dbname = strdup(p);
 201             default_dbname = p;
 202         }
 203         p = krb5_config_get_string(context, default_binding, "mkey_file", NULL);
 204         if(p) {
 205             di->mkey_file = strdup(p);
 206             default_mkey = p;
 207         }
 208         *dt = di;
 209         dt = &di->next;
 210     } else if(databases == NULL) {
 211         /* if there are none specified, use some default */
 212         di = calloc(1, sizeof(*di));
 213         di->dbname = strdup(default_dbname);
 214         di->mkey_file = strdup(default_mkey);
 215         *dt = di;
 216         dt = &di->next;
 217     }
 218     for(di = databases; di; di = di->next) {
 219         if(di->dbname == NULL)
 220             di->dbname = strdup(default_dbname);
 221         if(di->mkey_file == NULL) {
 222             p = strrchr(di->dbname, '.');
 223             if(p == NULL || strchr(p, '/') != NULL)
 224                 /* final pathname component does not contain a . */
 225                 asprintf(&di->mkey_file, "%s.mkey", di->dbname);
 226             else
 227                 /* the filename is something.else, replace .else with
 228                    .mkey */
 229                 asprintf(&di->mkey_file, "%.*s.mkey",
 230                          (int)(p - di->dbname), di->dbname);
 231         }
 232     }
 233 }
 234
 235 static void
 236 add_one_address (const char *str, int first)
 237 {
 238     krb5_error_code ret;
 239     krb5_addresses tmp;
 240
 241     ret = krb5_parse_address (context, str, &tmp);
 242     if (ret)
 243         krb5_err (context, 1, ret, "parse_address `%s'", str);
 244     if (first)
 245         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 246     else
 247         krb5_append_addresses(context, &explicit_addresses, &tmp);
 248     krb5_free_addresses (context, &tmp);
 249 }
 250
 251 void
 252 configure(int argc, char **argv)
 253 {
 254     int optind = 0;
 255     int e;
 256     const char *p;
 257
 258     while((e = getarg(args, num_args, argc, argv, &optind)))
 259         warnx("error at argument `%s'", argv[optind]);
 260
 261     if(help_flag)
 262         usage (0);
 263
 264     if (version_flag) {
 265         print_version(NULL);
 266         exit(0);
 267     }
 268
 269     argc -= optind;
 270     argv += optind;
 271
 272     if (argc != 0)
 273         usage(1);
 274
 275     {
 276         krb5_error_code ret;
 277         char **files;
 278         char *tmp;
 279         if(config_file == NULL)
 280             config_file = _PATH_KDC_CONF;
 281         asprintf(&tmp, "%s:%s", config_file, krb5_config_file);
 282         if(tmp == NULL)
 283             krb5_errx(context, 1, "out of memory");
 284
 285         krb5_config_file = tmp;
 286
 287         ret = krb5_get_default_config_files(&files);
 288         if(ret)
 289             krb5_err(context, 1, ret, "reading configuration files");
 290         ret = krb5_set_config_files(context, files);
 291         krb5_free_config_files(files);
 292         if(ret)
 293             krb5_err(context, 1, ret, "reading configuration files");
 294     }
 295
 296     get_dbinfo();
 297
 298     if(max_request_str)
 299         max_request = parse_bytes(max_request_str, NULL);
 300
 301     if(max_request == 0){
 302         p = krb5_config_get_string (context,
 303                                     NULL,
 304                                     "kdc",
 305                                     "max-request",
 306                                     NULL);
 307         if(p)
 308             max_request = parse_bytes(p, NULL);
 309     }
 310
 311     if(require_preauth == -1)
 312         require_preauth = krb5_config_get_bool(context, NULL, "kdc",
 313                                                "require-preauth", NULL);
 314
 315     if(port_str == NULL){
 316         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 317         if (p != NULL)
 318             port_str = strdup(p);
 319     }
 320
 321     explicit_addresses.len = 0;
 322
 323     if (addresses_str.num_strings) {
 324         int i;
 325
 326         for (i = 0; i < addresses_str.num_strings; ++i)
 327             add_one_address (addresses_str.strings[i], i == 0);
 328         free_getarg_strings (&addresses_str);
 329     } else {
 330         char **foo = krb5_config_get_strings (context, NULL,
 331                                               "kdc", "addresses", NULL);
 332
 333         if (foo != NULL) {
 334             add_one_address (*foo++, TRUE);
 335             while (*foo)
 336                 add_one_address (*foo++, FALSE);
 337         }
 338     }
 339
 340 #ifdef KRB4
 341     if(enable_v4 == -1)
 342         enable_v4 = krb5_config_get_bool_default(context, NULL, FALSE, "kdc",
 343                                          "enable-kerberos4", NULL);
 344 #else
 345 #define enable_v4 0
 346 #endif
 347     if(enable_v4_cross_realm == -1)
 348         enable_v4_cross_realm =
 349             krb5_config_get_bool_default(context, NULL,
 350                                          FALSE, "kdc",
 351                                          "enable-kerberos4-cross-realm",
 352                                          NULL);
 353     if(enable_524 == -1)
 354         enable_524 = krb5_config_get_bool_default(context, NULL, enable_v4,
 355                                                   "kdc", "enable-524", NULL);
 356
 357     if(enable_http == -1)
 358         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 359                                            "enable-http", NULL);
 360     check_ticket_addresses =
 361         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 362                                      "check-ticket-addresses", NULL);
 363     allow_null_ticket_addresses =
 364         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 365                                      "allow-null-ticket-addresses", NULL);
 366
 367     allow_anonymous =
 368         krb5_config_get_bool(context, NULL, "kdc",
 369                              "allow-anonymous", NULL);
 370     trpolicy_str =
 371         krb5_config_get_string_default(context, NULL, "always-check", "kdc",
 372                                        "transited-policy", NULL);
 373     if(strcasecmp(trpolicy_str, "always-check") == 0)
 374         trpolicy = TRPOLICY_ALWAYS_CHECK;
 375     else if(strcasecmp(trpolicy_str, "allow-per-principal") == 0)
 376         trpolicy = TRPOLICY_ALLOW_PER_PRINCIPAL;
 377     else if(strcasecmp(trpolicy_str, "always-honour-request") == 0)
 378         trpolicy = TRPOLICY_ALWAYS_HONOUR_REQUEST;
 379     else {
 380         kdc_log(0, "unknown transited-policy: %s, reverting to always-check",
 381                 trpolicy_str);
 382         trpolicy = TRPOLICY_ALWAYS_CHECK;
 383     }
 384
 385         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 386                                      "enforce-transited-policy", NULL);
 387 #ifdef KRB4
 388     if(v4_realm == NULL){
 389         p = krb5_config_get_string (context, NULL,
 390                                     "kdc",
 391                                     "v4-realm",
 392                                     NULL);
 393         if(p != NULL) {
 394             v4_realm = strdup(p);
 395             if (v4_realm == NULL)
 396                 krb5_errx(context, 1, "out of memory");
 397         }
 398     }
 399     if (enable_kaserver == -1)
 400         enable_kaserver = krb5_config_get_bool_default(context, NULL, FALSE,
 401                                                        "kdc",
 402                                                        "enable-kaserver",
 403                                                        NULL);
 404 #endif
 405
 406     encode_as_rep_as_tgs_rep = krb5_config_get_bool(context, NULL, "kdc",
 407                                                     "encode_as_rep_as_tgs_rep",
 408                                                     NULL);
 409
 410     kdc_warn_pwexpire = krb5_config_get_time (context, NULL,
 411                                               "kdc",
 412                                               "kdc_warn_pwexpire",
 413                                               NULL);
 414
 415 #ifdef HAVE_DAEMON
 416     if(detach_from_console == -1)
 417         detach_from_console = krb5_config_get_bool_default(context, NULL,
 418                                                            DETACH_IS_DEFAULT,
 419                                                            "kdc",
 420                                                            "detach", NULL);
 421 #endif
 422     kdc_openlog();
 423     if(max_request == 0)
 424         max_request = 64 * 1024;
 425     if(require_preauth == -1)
 426         require_preauth = 1;
 427     if (port_str == NULL)
 428         port_str = "+";
 429 #ifdef KRB4
 430     if(v4_realm == NULL){
 431         v4_realm = malloc(40); /* REALM_SZ */
 432         if (v4_realm == NULL)
 433             krb5_errx(context, 1, "out of memory");
 434         krb_get_lrealm(v4_realm, 1);
 435     }
 436 #endif
 437 }