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 struct dbinfo {
  41     char *realm;
  42     char *dbname;
  43     char *mkey_file;
  44     struct dbinfo *next;
  45 };
  46
  47 static char *config_file;       /* location of kdc config file */
  48
  49 static int require_preauth = -1; /* 1 == require preauth for all principals */
  50 static char *max_request_str;   /* `max_request' as a string */
  51
  52 static int disable_des = -1;
  53
  54 static int builtin_hdb_flag;
  55 static int help_flag;
  56 static int version_flag;
  57
  58 static struct getarg_strings addresses_str;     /* addresses to listen on */
  59
  60 char *runas_string;
  61 char *chroot_string;
  62
  63
  64 static struct getargs args[] = {
  65     {
  66         "config-file",  'c',    arg_string,     &config_file,
  67         "location of config file",      "file"
  68     },
  69     {
  70         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  71         "don't require pa-data in as-reqs", NULL
  72     },
  73     {
  74         "max-request",  0,      arg_string, &max_request_str,
  75         "max size for a kdc-request", "size"
  76     },
  77     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support",
  78          NULL },
  79     {   "ports",        'P',    arg_string, rk_UNCONST(&port_str),
  80         "ports to listen to", "portspec"
  81     },
  82 #ifdef SUPPORT_DETACH
  83 #if DETACH_IS_DEFAULT
  84     {
  85         "detach",       'D',      arg_negative_flag, &detach_from_console,
  86         "don't detach from console", NULL
  87     },
  88 #else
  89     {
  90         "detach",       0 ,      arg_flag, &detach_from_console,
  91         "detach from console", NULL
  92     },
  93 #endif
  94 #endif
  95     {   "addresses",    0,      arg_strings, &addresses_str,
  96         "addresses to listen on", "list of addresses" },
  97     {   "disable-des",  0,      arg_flag, &disable_des,
  98         "disable DES", NULL },
  99     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 100         "list builtin hdb backends", NULL},
 101     {   "runas-user",   0,      arg_string, &runas_string,
 102         "run as this user when connected to network", NULL
 103     },
 104     {   "chroot",       0,      arg_string, &chroot_string,
 105         "chroot directory to run in", NULL
 106     },
 107     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 108     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 109 };
 110
 111 static int num_args = sizeof(args) / sizeof(args[0]);
 112
 113 static void
 114 usage(int ret)
 115 {
 116     arg_printusage (args, num_args, NULL, "");
 117     exit (ret);
 118 }
 119
 120 static void
 121 add_one_address (krb5_context context, const char *str, int first)
 122 {
 123     krb5_error_code ret;
 124     krb5_addresses tmp;
 125
 126     ret = krb5_parse_address (context, str, &tmp);
 127     if (ret)
 128         krb5_err (context, 1, ret, "parse_address `%s'", str);
 129     if (first)
 130         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 131     else
 132         krb5_append_addresses(context, &explicit_addresses, &tmp);
 133     krb5_free_addresses (context, &tmp);
 134 }
 135
 136 krb5_kdc_configuration *
 137 configure(krb5_context context, int argc, char **argv)
 138 {
 139     krb5_kdc_configuration *config;
 140     krb5_error_code ret;
 141     int optidx = 0;
 142     const char *p;
 143
 144     while(getarg(args, num_args, argc, argv, &optidx))
 145         warnx("error at argument `%s'", argv[optidx]);
 146
 147     if(help_flag)
 148         usage (0);
 149
 150     if (version_flag) {
 151         print_version(NULL);
 152         exit(0);
 153     }
 154
 155     if (builtin_hdb_flag) {
 156         char *list;
 157         ret = hdb_list_builtin(context, &list);
 158         if (ret)
 159             krb5_err(context, 1, ret, "listing builtin hdb backends");
 160         printf("builtin hdb backends: %s\n", list);
 161         free(list);
 162         exit(0);
 163     }
 164
 165     argc -= optidx;
 166     argv += optidx;
 167
 168     if (argc != 0)
 169         usage(1);
 170
 171     {
 172         char **files;
 173
 174         if (config_file == NULL) {
 175             asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 176             if (config_file == NULL)
 177                 errx(1, "out of memory");
 178         }
 179
 180         ret = krb5_prepend_config_files_default(config_file, &files);
 181         if (ret)
 182             krb5_err(context, 1, ret, "getting configuration files");
 183
 184         ret = krb5_set_config_files(context, files);
 185         krb5_free_config_files(files);
 186         if(ret)
 187             krb5_err(context, 1, ret, "reading configuration files");
 188     }
 189
 190     ret = krb5_kdc_get_config(context, &config);
 191     if (ret)
 192         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 193
 194     kdc_openlog(context, "kdc", config);
 195
 196     ret = krb5_kdc_set_dbinfo(context, config);
 197     if (ret)
 198         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 199
 200     if(max_request_str)
 201         max_request_tcp = max_request_udp = parse_bytes(max_request_str, NULL);
 202
 203     if(max_request_tcp == 0){
 204         p = krb5_config_get_string (context,
 205                                     NULL,
 206                                     "kdc",
 207                                     "max-request",
 208                                     NULL);
 209         if(p)
 210             max_request_tcp = max_request_udp = parse_bytes(p, NULL);
 211     }
 212
 213     if(require_preauth != -1)
 214         config->require_preauth = require_preauth;
 215
 216     if(port_str == NULL){
 217         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 218         if (p != NULL)
 219             port_str = strdup(p);
 220     }
 221
 222     explicit_addresses.len = 0;
 223
 224     if (addresses_str.num_strings) {
 225         int i;
 226
 227         for (i = 0; i < addresses_str.num_strings; ++i)
 228             add_one_address (context, addresses_str.strings[i], i == 0);
 229         free_getarg_strings (&addresses_str);
 230     } else {
 231         char **foo = krb5_config_get_strings (context, NULL,
 232                                               "kdc", "addresses", NULL);
 233
 234         if (foo != NULL) {
 235             add_one_address (context, *foo++, TRUE);
 236             while (*foo)
 237                 add_one_address (context, *foo++, FALSE);
 238         }
 239     }
 240
 241     if(enable_http == -1)
 242         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 243                                            "enable-http", NULL);
 244
 245     if(request_log == NULL)
 246         request_log = krb5_config_get_string(context, NULL,
 247                                              "kdc",
 248                                              "kdc-request-log",
 249                                              NULL);
 250
 251     if (krb5_config_get_string(context, NULL, "kdc",
 252                                "enforce-transited-policy", NULL))
 253         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 254                   "use [kdc]transited-policy instead");
 255
 256 #ifdef SUPPORT_DETACH
 257     if(detach_from_console == -1)
 258         detach_from_console = krb5_config_get_bool_default(context, NULL,
 259                                                            DETACH_IS_DEFAULT,
 260                                                            "kdc",
 261                                                            "detach", NULL);
 262 #endif /* SUPPORT_DETACH */
 263
 264     if(max_request_tcp == 0)
 265         max_request_tcp = 64 * 1024;
 266     if(max_request_udp == 0)
 267         max_request_udp = 64 * 1024;
 268
 269     if (port_str == NULL)
 270         port_str = "+";
 271
 272     if(disable_des == -1)
 273         disable_des = krb5_config_get_bool_default(context, NULL,
 274                                                    FALSE,
 275                                                    "kdc",
 276                                                    "disable-des", NULL);
 277     if(disable_des) {
 278         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 279         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 280         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 281         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 282         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 283         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 284     }
 285
 286     krb5_kdc_windc_init(context);
 287
 288     krb5_kdc_pkinit_config(context, config);
 289
 290     return config;
 291 }