kdc/config.c

   1 /*
   2  * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of the Institute nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "kdc_locl.h"
  36 #include <getarg.h>
  37 #include <parse_bytes.h>
  38
  39 RCSID("$Id$");
  40
  41 struct dbinfo {
  42     char *realm;
  43     char *dbname;
  44     char *mkey_file;
  45     struct dbinfo *next;
  46 };
  47
  48 static char *config_file;       /* location of kdc config file */
  49
  50 static int require_preauth = -1; /* 1 == require preauth for all principals */
  51 static char *max_request_str;   /* `max_request' as a string */
  52
  53 static int disable_des = -1;
  54 static int enable_v4 = -1;
  55 static int enable_kaserver = -1;
  56 static int enable_524 = -1;
  57 static int enable_v4_cross_realm = -1;
  58
  59 static int builtin_hdb_flag;
  60 static int help_flag;
  61 static int version_flag;
  62
  63 static struct getarg_strings addresses_str;     /* addresses to listen on */
  64
  65 static char *v4_realm;
  66
  67 static struct getargs args[] = {
  68     {
  69         "config-file",  'c',    arg_string,     &config_file,
  70         "location of config file",      "file"
  71     },
  72     {
  73         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  74         "don't require pa-data in as-reqs"
  75     },
  76     {
  77         "max-request",  0,      arg_string, &max_request,
  78         "max size for a kdc-request", "size"
  79     },
  80     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support" },
  81     {   "524",          0,      arg_negative_flag, &enable_524,
  82         "don't respond to 524 requests"
  83     },
  84     {
  85         "kaserver", 'K', arg_flag,   &enable_kaserver,
  86         "enable kaserver support"
  87     },
  88     {   "kerberos4",    0,      arg_flag, &enable_v4,
  89         "respond to kerberos 4 requests"
  90     },
  91     {
  92         "v4-realm",     'r',    arg_string, &v4_realm,
  93         "realm to serve v4-requests for"
  94     },
  95     {   "kerberos4-cross-realm",        0,      arg_flag,
  96         &enable_v4_cross_realm,
  97         "respond to kerberos 4 requests from foreign realms"
  98     },
  99     {   "ports",        'P',    arg_string, &port_str,
 100         "ports to listen to", "portspec"
 101     },
 102 #if DETACH_IS_DEFAULT
 103     {
 104         "detach",       'D',      arg_negative_flag, &detach_from_console,
 105         "don't detach from console"
 106     },
 107 #else
 108     {
 109         "detach",       0 ,      arg_flag, &detach_from_console,
 110         "detach from console"
 111     },
 112 #endif
 113     {   "addresses",    0,      arg_strings, &addresses_str,
 114         "addresses to listen on", "list of addresses" },
 115     {   "disable-des",  0,      arg_flag, &disable_des,
 116         "disable DES" },
 117     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 118         "list builtin hdb backends"},
 119     {   "help",         'h',    arg_flag,   &help_flag },
 120     {   "version",      'v',    arg_flag,   &version_flag }
 121 };
 122
 123 static int num_args = sizeof(args) / sizeof(args[0]);
 124
 125 static void
 126 usage(int ret)
 127 {
 128     arg_printusage (args, num_args, NULL, "");
 129     exit (ret);
 130 }
 131
 132 static void
 133 add_one_address (krb5_context context, const char *str, int first)
 134 {
 135     krb5_error_code ret;
 136     krb5_addresses tmp;
 137
 138     ret = krb5_parse_address (context, str, &tmp);
 139     if (ret)
 140         krb5_err (context, 1, ret, "parse_address `%s'", str);
 141     if (first)
 142         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 143     else
 144         krb5_append_addresses(context, &explicit_addresses, &tmp);
 145     krb5_free_addresses (context, &tmp);
 146 }
 147
 148 krb5_kdc_configuration *
 149 configure(krb5_context context, int argc, char **argv)
 150 {
 151     krb5_kdc_configuration *config;
 152     krb5_error_code ret;
 153     int optidx = 0;
 154     const char *p;
 155
 156     while(getarg(args, num_args, argc, argv, &optidx))
 157         warnx("error at argument `%s'", argv[optidx]);
 158
 159     if(help_flag)
 160         usage (0);
 161
 162     if (version_flag) {
 163         print_version(NULL);
 164         exit(0);
 165     }
 166
 167     if (builtin_hdb_flag) {
 168         char *list;
 169         ret = hdb_list_builtin(context, &list);
 170         if (ret)
 171             krb5_err(context, 1, ret, "listing builtin hdb backends");
 172         printf("builtin hdb backends: %s\n", list);
 173         free(list);
 174         exit(0);
 175     }
 176
 177     argc -= optidx;
 178     argv += optidx;
 179
 180     if (argc != 0)
 181         usage(1);
 182
 183     {
 184         char **files;
 185
 186         if (config_file == NULL) {
 187             asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 188             if (config_file == NULL)
 189                 errx(1, "out of memory");
 190         }
 191
 192         ret = krb5_prepend_config_files_default(config_file, &files);
 193         if (ret)
 194             krb5_err(context, 1, ret, "getting configuration files");
 195
 196         ret = krb5_set_config_files(context, files);
 197         krb5_free_config_files(files);
 198         if(ret)
 199             krb5_err(context, 1, ret, "reading configuration files");
 200     }
 201
 202     ret = krb5_kdc_get_config(context, &config);
 203     if (ret)
 204         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 205
 206     kdc_openlog(context, config);
 207
 208     ret = krb5_kdc_set_dbinfo(context, config);
 209     if (ret)
 210         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 211
 212     if(max_request_str)
 213         max_request = parse_bytes(max_request_str, NULL);
 214
 215     if(max_request == 0){
 216         p = krb5_config_get_string (context,
 217                                     NULL,
 218                                     "kdc",
 219                                     "max-request",
 220                                     NULL);
 221         if(p)
 222             max_request = parse_bytes(p, NULL);
 223     }
 224
 225     if(require_preauth != -1)
 226         config->require_preauth = require_preauth;
 227
 228     if(port_str == NULL){
 229         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 230         if (p != NULL)
 231             port_str = strdup(p);
 232     }
 233
 234     explicit_addresses.len = 0;
 235
 236     if (addresses_str.num_strings) {
 237         int i;
 238
 239         for (i = 0; i < addresses_str.num_strings; ++i)
 240             add_one_address (context, addresses_str.strings[i], i == 0);
 241         free_getarg_strings (&addresses_str);
 242     } else {
 243         char **foo = krb5_config_get_strings (context, NULL,
 244                                               "kdc", "addresses", NULL);
 245
 246         if (foo != NULL) {
 247             add_one_address (context, *foo++, TRUE);
 248             while (*foo)
 249                 add_one_address (context, *foo++, FALSE);
 250         }
 251     }
 252
 253     if(enable_v4 != -1)
 254         config->enable_v4 = enable_v4;
 255
 256     if(enable_v4_cross_realm != -1)
 257         config->enable_v4_cross_realm = enable_v4_cross_realm;
 258
 259     if(enable_524 != -1)
 260         config->enable_524 = enable_524;
 261
 262     if(enable_http == -1)
 263         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 264                                            "enable-http", NULL);
 265
 266     if(request_log == NULL)
 267         request_log = krb5_config_get_string(context, NULL,
 268                                              "kdc",
 269                                              "kdc-request-log",
 270                                              NULL);
 271
 272     if (krb5_config_get_string(context, NULL, "kdc",
 273                                "enforce-transited-policy", NULL))
 274         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 275                   "use [kdc]transited-policy instead");
 276
 277     if (enable_kaserver != -1)
 278         config->enable_kaserver = enable_kaserver;
 279
 280     if(detach_from_console == -1)
 281         detach_from_console = krb5_config_get_bool_default(context, NULL,
 282                                                            DETACH_IS_DEFAULT,
 283                                                            "kdc",
 284                                                            "detach", NULL);
 285
 286     if(max_request == 0)
 287         max_request = 64 * 1024;
 288
 289     if (port_str == NULL)
 290         port_str = "+";
 291
 292     if (v4_realm)
 293         config->v4_realm = v4_realm;
 294
 295     if(config->v4_realm == NULL && (config->enable_kaserver || config->enable_v4))
 296         krb5_errx(context, 1, "Kerberos 4 enabled but no realm configured");
 297
 298     if(disable_des == -1)
 299         disable_des = krb5_config_get_bool_default(context, NULL,
 300                                                    FALSE,
 301                                                    "kdc",
 302                                                    "disable-des", NULL);
 303     if(disable_des) {
 304         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 305         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 306         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 307         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 308         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 309         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 310
 311         kdc_log(context, config,
 312                 0, "DES was disabled, turned off Kerberos V4, 524 "
 313                 "and kaserver");
 314         config->enable_v4 = 0;
 315         config->enable_524 = 0;
 316         config->enable_kaserver = 0;
 317     }
 318
 319     krb5_kdc_windc_init(context);
 320
 321     return config;
 322 }