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
  68 static struct getarg_strings addresses_str;     /* addresses to listen on */
  69 krb5_addresses explicit_addresses;
  70
  71 #ifdef KRB4
  72 char *v4_realm;
  73 int enable_v4 = -1;
  74 int enable_524 = -1;
  75 int enable_v4_cross_realm = -1;
  76 int enable_kaserver = -1;
  77 #endif
  78
  79 static int help_flag;
  80 static int version_flag;
  81
  82 static struct getargs args[] = {
  83     {
  84         "config-file",  'c',    arg_string,     &config_file,
  85         "location of config file",      "file"
  86     },
  87     {
  88         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  89         "don't require pa-data in as-reqs"
  90     },
  91     {
  92         "max-request",  0,      arg_string, &max_request,
  93         "max size for a kdc-request", "size"
  94     },
  95 #if 0
  96     {
  97         "database",     'd',    arg_string, &databases,
  98         "location of database", "database"
  99     },
 100 #endif
 101     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support" },
 102 #ifdef KRB4
 103     {   "kerberos4",    0,      arg_negative_flag, &enable_v4,
 104         "don't respond to kerberos 4 requests"
 105     },
 106     {   "524",          0,      arg_negative_flag, &enable_524,
 107         "don't respond to 524 requests"
 108     },
 109     {   "kerberos4-cross-realm",        0,      arg_flag,
 110         &enable_v4_cross_realm,
 111         "respond to kerberos 4 requests from foreign realms"
 112     },
 113     {
 114         "v4-realm",     'r',    arg_string, &v4_realm,
 115         "realm to serve v4-requests for"
 116     },
 117     {
 118         "kaserver", 'K', arg_flag,   &enable_kaserver,
 119         "enable kaserver support"
 120     },
 121 #endif
 122     {   "ports",        'P',    arg_string, &port_str,
 123         "ports to listen to", "portspec"
 124     },
 125 #ifdef HAVE_DAEMON
 126 #if DETACH_IS_DEFAULT
 127     {
 128         "detach",       'D',      arg_negative_flag, &detach_from_console,
 129         "don't detach from console"
 130     },
 131 #else
 132     {
 133         "detach",       0 ,      arg_flag, &detach_from_console,
 134         "detach from console"
 135     },
 136 #endif
 137 #endif
 138     {   "addresses",    0,      arg_strings, &addresses_str,
 139         "addresses to listen on", "list of addresses" },
 140     {   "help",         'h',    arg_flag,   &help_flag },
 141     {   "version",      'v',    arg_flag,   &version_flag }
 142 };
 143
 144 static int num_args = sizeof(args) / sizeof(args[0]);
 145
 146 static void
 147 usage(int ret)
 148 {
 149     arg_printusage (args, num_args, NULL, "");
 150     exit (ret);
 151 }
 152
 153 static void
 154 get_dbinfo(void)
 155 {
 156     const krb5_config_binding *top_binding = NULL;
 157     const krb5_config_binding *db_binding;
 158     const krb5_config_binding *default_binding = NULL;
 159     struct dbinfo *di, **dt;
 160     const char *default_dbname = HDB_DEFAULT_DB;
 161     const char *default_mkey = HDB_DB_DIR "/m-key";
 162     const char *p;
 163
 164     databases = NULL;
 165     dt = &databases;
 166     while((db_binding = (const krb5_config_binding *)
 167            krb5_config_get_next(context, NULL, &top_binding,
 168                                 krb5_config_list,
 169                                 "kdc",
 170                                 "database",
 171                                 NULL))) {
 172         p = krb5_config_get_string(context, db_binding, "realm", NULL);
 173         if(p == NULL) {
 174             if(default_binding) {
 175                 krb5_warnx(context, "WARNING: more than one realm-less "
 176                            "database specification");
 177                 krb5_warnx(context, "WARNING: using the first encountered");
 178             } else
 179                 default_binding = db_binding;
 180             continue;
 181         }
 182         di = calloc(1, sizeof(*di));
 183         di->realm = strdup(p);
 184         p = krb5_config_get_string(context, db_binding, "dbname", NULL);
 185         if(p)
 186             di->dbname = strdup(p);
 187         p = krb5_config_get_string(context, db_binding, "mkey_file", NULL);
 188         if(p)
 189             di->mkey_file = strdup(p);
 190         *dt = di;
 191         dt = &di->next;
 192     }
 193     if(default_binding) {
 194         di = calloc(1, sizeof(*di));
 195         p = krb5_config_get_string(context, default_binding, "dbname", NULL);
 196         if(p) {
 197             di->dbname = strdup(p);
 198             default_dbname = p;
 199         }
 200         p = krb5_config_get_string(context, default_binding, "mkey_file", NULL);
 201         if(p) {
 202             di->mkey_file = strdup(p);
 203             default_mkey = p;
 204         }
 205         *dt = di;
 206         dt = &di->next;
 207     } else if(databases == NULL) {
 208         /* if there are none specified, use some default */
 209         di = calloc(1, sizeof(*di));
 210         di->dbname = strdup(default_dbname);
 211         di->mkey_file = strdup(default_mkey);
 212         *dt = di;
 213         dt = &di->next;
 214     }
 215     for(di = databases; di; di = di->next) {
 216         if(di->dbname == NULL)
 217             di->dbname = strdup(default_dbname);
 218         if(di->mkey_file == NULL) {
 219             p = strrchr(di->dbname, '.');
 220             if(p == NULL || strchr(p, '/') != NULL)
 221                 /* final pathname component does not contain a . */
 222                 asprintf(&di->mkey_file, "%s.mkey", di->dbname);
 223             else
 224                 /* the filename is something.else, replace .else with
 225                    .mkey */
 226                 asprintf(&di->mkey_file, "%.*s.mkey",
 227                          (int)(p - di->dbname), di->dbname);
 228         }
 229     }
 230 }
 231
 232 static void
 233 add_one_address (const char *str, int first)
 234 {
 235     krb5_error_code ret;
 236     krb5_addresses tmp;
 237
 238     ret = krb5_parse_address (context, str, &tmp);
 239     if (ret)
 240         krb5_err (context, 1, ret, "parse_address `%s'", str);
 241     if (first)
 242         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 243     else
 244         krb5_append_addresses(context, &explicit_addresses, &tmp);
 245     krb5_free_addresses (context, &tmp);
 246 }
 247
 248 void
 249 configure(int argc, char **argv)
 250 {
 251     int optind = 0;
 252     int e;
 253     const char *p;
 254
 255     while((e = getarg(args, num_args, argc, argv, &optind)))
 256         warnx("error at argument `%s'", argv[optind]);
 257
 258     if(help_flag)
 259         usage (0);
 260
 261     if (version_flag) {
 262         print_version(NULL);
 263         exit(0);
 264     }
 265
 266     argc -= optind;
 267     argv += optind;
 268
 269     if (argc != 0)
 270         usage(1);
 271
 272     {
 273         krb5_error_code ret;
 274         char **files;
 275         char *tmp;
 276         if(config_file == NULL)
 277             config_file = _PATH_KDC_CONF;
 278         asprintf(&tmp, "%s:%s", config_file, krb5_config_file);
 279         if(tmp == NULL)
 280             krb5_errx(context, 1, "out of memory");
 281
 282         krb5_config_file = tmp;
 283
 284         ret = krb5_get_default_config_files(&files);
 285         if(ret)
 286             krb5_err(context, 1, ret, "reading configuration files");
 287         ret = krb5_set_config_files(context, files);
 288         krb5_free_config_files(files);
 289         if(ret)
 290             krb5_err(context, 1, ret, "reading configuration files");
 291     }
 292
 293     get_dbinfo();
 294
 295     if(max_request_str){
 296         max_request = parse_bytes(max_request_str, NULL);
 297     }
 298
 299     if(max_request == 0){
 300         p = krb5_config_get_string (context,
 301                                     NULL,
 302                                     "kdc",
 303                                     "max-request",
 304                                     NULL);
 305         if(p)
 306             max_request = parse_bytes(p, NULL);
 307     }
 308
 309     if(require_preauth == -1)
 310         require_preauth = krb5_config_get_bool(context, NULL, "kdc",
 311                                                "require-preauth", NULL);
 312
 313     if(port_str == NULL){
 314         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 315         if (p != NULL)
 316             port_str = strdup(p);
 317     }
 318
 319     explicit_addresses.len = 0;
 320
 321     if (addresses_str.num_strings) {
 322         int i;
 323
 324         for (i = 0; i < addresses_str.num_strings; ++i)
 325             add_one_address (addresses_str.strings[i], i == 0);
 326         free_getarg_strings (&addresses_str);
 327     } else {
 328         char **foo = krb5_config_get_strings (context, NULL,
 329                                               "kdc", "addresses", NULL);
 330
 331         if (foo != NULL) {
 332             add_one_address (*foo++, TRUE);
 333             while (*foo)
 334                 add_one_address (*foo++, FALSE);
 335         }
 336     }
 337
 338 #ifdef KRB4
 339     if(enable_v4 == -1)
 340         enable_v4 = krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 341                                          "enable-kerberos4", NULL);
 342     if(enable_v4_cross_realm == -1)
 343         enable_v4_cross_realm =
 344             krb5_config_get_bool_default(context, NULL,
 345                                          FALSE, "kdc",
 346                                          "enable-kerberos4-cross-realm",
 347                                          NULL);
 348     if(enable_524 == -1)
 349         enable_524 = krb5_config_get_bool_default(context, NULL, enable_v4,
 350                                                   "kdc", "enable-524", NULL);
 351 #else
 352 #define enable_v4 0
 353 #endif
 354
 355     if(enable_http == -1)
 356         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 357                                            "enable-http", NULL);
 358     check_ticket_addresses =
 359         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 360                                      "check-ticket-addresses", NULL);
 361     allow_null_ticket_addresses =
 362         krb5_config_get_bool_default(context, NULL, TRUE, "kdc",
 363                                      "allow-null-ticket-addresses", NULL);
 364
 365     allow_anonymous =
 366         krb5_config_get_bool(context, NULL, "kdc",
 367                              "allow-anonymous", NULL);
 368 #ifdef KRB4
 369     if(v4_realm == NULL){
 370         p = krb5_config_get_string (context, NULL,
 371                                     "kdc",
 372                                     "v4-realm",
 373                                     NULL);
 374         if(p != NULL) {
 375             v4_realm = strdup(p);
 376             if (v4_realm == NULL)
 377                 krb5_errx(context, 1, "out of memory");
 378         }
 379     }
 380     if (enable_kaserver == -1)
 381         enable_kaserver = krb5_config_get_bool_default(context, NULL, FALSE,
 382                                                        "kdc",
 383                                                        "enable-kaserver",
 384                                                        NULL);
 385 #endif
 386
 387     encode_as_rep_as_tgs_rep = krb5_config_get_bool(context, NULL, "kdc",
 388                                                     "encode_as_rep_as_tgs_rep",
 389                                                     NULL);
 390
 391     kdc_warn_pwexpire = krb5_config_get_time (context, NULL,
 392                                               "kdc",
 393                                               "kdc_warn_pwexpire",
 394                                               NULL);
 395
 396 #ifdef HAVE_DAEMON
 397     if(detach_from_console == -1)
 398         detach_from_console = krb5_config_get_bool_default(context, NULL,
 399                                                            DETACH_IS_DEFAULT,
 400                                                            "kdc",
 401                                                            "detach", NULL);
 402 #endif
 403     kdc_openlog();
 404     if(max_request == 0)
 405         max_request = 64 * 1024;
 406     if(require_preauth == -1)
 407         require_preauth = 1;
 408     if (port_str == NULL)
 409         port_str = "+";
 410 #ifdef KRB4
 411     if(v4_realm == NULL){
 412         v4_realm = malloc(40); /* REALM_SZ */
 413         if (v4_realm == NULL)
 414             krb5_errx(context, 1, "out of memory");
 415         krb_get_lrealm(v4_realm, 1);
 416     }
 417 #endif
 418 }