kdc/config.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 "kdc_locl.h"
  37 #include <getarg.h>
  38 #include <parse_bytes.h>
  39
  40 RCSID("$Id$");
  41
  42 struct dbinfo {
  43     char *realm;
  44     char *dbname;
  45     char *mkey_file;
  46     struct dbinfo *next;
  47 };
  48
  49 static char *config_file;       /* location of kdc config file */
  50
  51 static int require_preauth = -1; /* 1 == require preauth for all principals */
  52 static char *max_request_str;   /* `max_request' as a string */
  53
  54 static int disable_des = -1;
  55 static int enable_v4 = -1;
  56 static int enable_kaserver = -1;
  57 static int enable_524 = -1;
  58 static int enable_v4_cross_realm = -1;
  59
  60 static int builtin_hdb_flag;
  61 static int help_flag;
  62 static int version_flag;
  63
  64 static struct getarg_strings addresses_str;     /* addresses to listen on */
  65
  66 static char *v4_realm;
  67
  68 char *runas_string;
  69 char *chroot_string;
  70
  71
  72 static struct getargs args[] = {
  73     {
  74         "config-file",  'c',    arg_string,     &config_file,
  75         "location of config file",      "file"
  76     },
  77     {
  78         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  79         "don't require pa-data in as-reqs"
  80     },
  81     {
  82         "max-request",  0,      arg_string, &max_request_str,
  83         "max size for a kdc-request", "size"
  84     },
  85     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support" },
  86     {   "524",          0,      arg_negative_flag, &enable_524,
  87         "don't respond to 524 requests"
  88     },
  89     {
  90         "kaserver", 'K', arg_flag,   &enable_kaserver,
  91         "enable kaserver support"
  92     },
  93     {   "kerberos4",    0,      arg_flag, &enable_v4,
  94         "respond to kerberos 4 requests"
  95     },
  96     {
  97         "v4-realm",     'r',    arg_string, &v4_realm,
  98         "realm to serve v4-requests for"
  99     },
 100     {   "kerberos4-cross-realm",        0,      arg_flag,
 101         &enable_v4_cross_realm,
 102         "respond to kerberos 4 requests from foreign realms"
 103     },
 104     {   "ports",        'P',    arg_string, &port_str,
 105         "ports to listen to", "portspec"
 106     },
 107 #ifdef SUPPORT_DETACH
 108 #if DETACH_IS_DEFAULT
 109     {
 110         "detach",       'D',      arg_negative_flag, &detach_from_console,
 111         "don't detach from console"
 112     },
 113 #else
 114     {
 115         "detach",       0 ,      arg_flag, &detach_from_console,
 116         "detach from console"
 117     },
 118 #endif
 119 #endif
 120     {   "addresses",    0,      arg_strings, &addresses_str,
 121         "addresses to listen on", "list of addresses" },
 122     {   "disable-des",  0,      arg_flag, &disable_des,
 123         "disable DES" },
 124     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 125         "list builtin hdb backends"},
 126     {   "runas-user",   0,      arg_string, &runas_string,
 127         "run as this user when connected to network"
 128     },
 129     {   "chroot",       0,      arg_string, &chroot_string,
 130         "chroot directory to run in"
 131     },
 132     {   "help",         'h',    arg_flag,   &help_flag },
 133     {   "version",      'v',    arg_flag,   &version_flag }
 134 };
 135
 136 static int num_args = sizeof(args) / sizeof(args[0]);
 137
 138 static void
 139 usage(int ret)
 140 {
 141     arg_printusage (args, num_args, NULL, "");
 142     exit (ret);
 143 }
 144
 145 static void
 146 add_one_address (krb5_context context, const char *str, int first)
 147 {
 148     krb5_error_code ret;
 149     krb5_addresses tmp;
 150
 151     ret = krb5_parse_address (context, str, &tmp);
 152     if (ret)
 153         krb5_err (context, 1, ret, "parse_address `%s'", str);
 154     if (first)
 155         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 156     else
 157         krb5_append_addresses(context, &explicit_addresses, &tmp);
 158     krb5_free_addresses (context, &tmp);
 159 }
 160
 161 krb5_kdc_configuration *
 162 configure(krb5_context context, int argc, char **argv)
 163 {
 164     krb5_kdc_configuration *config;
 165     krb5_error_code ret;
 166     int optidx = 0;
 167     const char *p;
 168
 169     while(getarg(args, num_args, argc, argv, &optidx))
 170         warnx("error at argument `%s'", argv[optidx]);
 171
 172     if(help_flag)
 173         usage (0);
 174
 175     if (version_flag) {
 176         print_version(NULL);
 177         exit(0);
 178     }
 179
 180     if (builtin_hdb_flag) {
 181         char *list;
 182         ret = hdb_list_builtin(context, &list);
 183         if (ret)
 184             krb5_err(context, 1, ret, "listing builtin hdb backends");
 185         printf("builtin hdb backends: %s\n", list);
 186         free(list);
 187         exit(0);
 188     }
 189
 190     argc -= optidx;
 191     argv += optidx;
 192
 193     if (argc != 0)
 194         usage(1);
 195
 196     {
 197         char **files;
 198
 199         if (config_file == NULL) {
 200             asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 201             if (config_file == NULL)
 202                 errx(1, "out of memory");
 203         }
 204
 205         ret = krb5_prepend_config_files_default(config_file, &files);
 206         if (ret)
 207             krb5_err(context, 1, ret, "getting configuration files");
 208
 209         ret = krb5_set_config_files(context, files);
 210         krb5_free_config_files(files);
 211         if(ret)
 212             krb5_err(context, 1, ret, "reading configuration files");
 213     }
 214
 215     ret = krb5_kdc_get_config(context, &config);
 216     if (ret)
 217         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 218
 219     kdc_openlog(context, "kdc", config);
 220
 221     ret = krb5_kdc_set_dbinfo(context, config);
 222     if (ret)
 223         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 224
 225     if(max_request_str)
 226         max_request_tcp = max_request_udp = parse_bytes(max_request_str, NULL);
 227
 228     if(max_request_tcp == 0){
 229         p = krb5_config_get_string (context,
 230                                     NULL,
 231                                     "kdc",
 232                                     "max-request",
 233                                     NULL);
 234         if(p)
 235             max_request_tcp = max_request_udp = parse_bytes(p, NULL);
 236     }
 237
 238     if(require_preauth != -1)
 239         config->require_preauth = require_preauth;
 240
 241     if(port_str == NULL){
 242         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 243         if (p != NULL)
 244             port_str = strdup(p);
 245     }
 246
 247     explicit_addresses.len = 0;
 248
 249     if (addresses_str.num_strings) {
 250         int i;
 251
 252         for (i = 0; i < addresses_str.num_strings; ++i)
 253             add_one_address (context, addresses_str.strings[i], i == 0);
 254         free_getarg_strings (&addresses_str);
 255     } else {
 256         char **foo = krb5_config_get_strings (context, NULL,
 257                                               "kdc", "addresses", NULL);
 258
 259         if (foo != NULL) {
 260             add_one_address (context, *foo++, TRUE);
 261             while (*foo)
 262                 add_one_address (context, *foo++, FALSE);
 263         }
 264     }
 265
 266     if(enable_v4 != -1)
 267         config->enable_v4 = enable_v4;
 268
 269     if(enable_v4_cross_realm != -1)
 270         config->enable_v4_cross_realm = enable_v4_cross_realm;
 271
 272     if(enable_524 != -1)
 273         config->enable_524 = enable_524;
 274
 275     if(enable_http == -1)
 276         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 277                                            "enable-http", NULL);
 278
 279     if(request_log == NULL)
 280         request_log = krb5_config_get_string(context, NULL,
 281                                              "kdc",
 282                                              "kdc-request-log",
 283                                              NULL);
 284
 285     if (krb5_config_get_string(context, NULL, "kdc",
 286                                "enforce-transited-policy", NULL))
 287         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 288                   "use [kdc]transited-policy instead");
 289
 290     if (enable_kaserver != -1)
 291         config->enable_kaserver = enable_kaserver;
 292
 293 #ifdef SUPPORT_DETACH
 294     if(detach_from_console == -1)
 295         detach_from_console = krb5_config_get_bool_default(context, NULL,
 296                                                            DETACH_IS_DEFAULT,
 297                                                            "kdc",
 298                                                            "detach", NULL);
 299 #endif /* SUPPORT_DETACH */
 300
 301     if(max_request_tcp == 0)
 302         max_request_tcp = 64 * 1024;
 303     if(max_request_udp == 0)
 304         max_request_udp = 64 * 1024;
 305
 306     if (port_str == NULL)
 307         port_str = "+";
 308
 309     if (v4_realm)
 310         config->v4_realm = v4_realm;
 311
 312     if(config->v4_realm == NULL && (config->enable_kaserver || config->enable_v4))
 313         krb5_errx(context, 1, "Kerberos 4 enabled but no realm configured");
 314
 315     if(disable_des == -1)
 316         disable_des = krb5_config_get_bool_default(context, NULL,
 317                                                    FALSE,
 318                                                    "kdc",
 319                                                    "disable-des", NULL);
 320     if(disable_des) {
 321         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 322         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 323         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 324         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 325         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 326         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 327
 328         kdc_log(context, config,
 329                 0, "DES was disabled, turned off Kerberos V4, 524 "
 330                 "and kaserver");
 331         config->enable_v4 = 0;
 332         config->enable_524 = 0;
 333         config->enable_kaserver = 0;
 334     }
 335
 336     krb5_kdc_windc_init(context);
 337
 338 #ifdef __APPLE__
 339     config->enable_pkinit = 1;
 340
 341     if (config->pkinit_kdc_identity == NULL) {
 342         if (config->pkinit_kdc_friendly_name == NULL)
 343             config->pkinit_kdc_friendly_name =
 344                 strdup("O=System Identity,CN=com.apple.kerberos.kdc");
 345         config->pkinit_kdc_identity = strdup("KEYCHAIN:");
 346     }
 347     if (config->pkinit_kdc_anchors == NULL)
 348         config->pkinit_kdc_anchors = strdup("KEYCHAIN:");
 349
 350 #endif
 351
 352     if (config->enable_pkinit) {
 353         if (config->pkinit_kdc_identity == NULL)
 354             krb5_errx(context, 1, "pkinit enabled but no identity");
 355
 356         if (config->pkinit_kdc_anchors == NULL)
 357             krb5_errx(context, 1, "pkinit enabled but no X509 anchors");
 358
 359         _kdc_pk_initialize(context, config,
 360                            config->pkinit_kdc_identity,
 361                            config->pkinit_kdc_anchors,
 362                            config->pkinit_kdc_cert_pool,
 363                            config->pkinit_kdc_revoke);
 364
 365     }
 366
 367     return config;
 368 }