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 int testing_flag;
  56 static int help_flag;
  57 static int version_flag;
  58
  59 /* Should we enable the HTTP hack? */
  60 int enable_http = -1;
  61
  62 /* Log over requests to the KDC */
  63 const char *request_log;
  64
  65 /* A string describing on what ports to listen */
  66 const char *port_str;
  67
  68 krb5_addresses explicit_addresses;
  69
  70 size_t max_request_udp;
  71 size_t max_request_tcp;
  72
  73
  74 static struct getarg_strings addresses_str;     /* addresses to listen on */
  75
  76 char *runas_string;
  77 char *chroot_string;
  78
  79
  80 static struct getargs args[] = {
  81     {
  82         "config-file",  'c',    arg_string,     &config_file,
  83         "location of config file",      "file"
  84     },
  85     {
  86         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  87         "don't require pa-data in as-reqs", NULL
  88     },
  89     {
  90         "max-request",  0,      arg_string, &max_request_str,
  91         "max size for a kdc-request", "size"
  92     },
  93     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support",
  94          NULL },
  95     {   "ports",        'P',    arg_string, rk_UNCONST(&port_str),
  96         "ports to listen to", "portspec"
  97     },
  98     {
  99         "detach",       0 ,      arg_flag, &detach_from_console,
 100         "detach from console", NULL
 101     },
 102     {
 103         "daemon-child",       0 ,      arg_flag, &daemon_child,
 104         "private argument, do not use", NULL
 105     },
 106 #ifdef __APPLE__
 107     {
 108         "bonjour",       0 ,      arg_flag, &do_bonjour,
 109         "private argument, do not use", NULL
 110     },
 111 #endif
 112     {   "addresses",    0,      arg_strings, &addresses_str,
 113         "addresses to listen on", "list of addresses" },
 114     {   "disable-des",  0,      arg_flag, &disable_des,
 115         "disable DES", NULL },
 116     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 117         "list builtin hdb backends", NULL},
 118     {   "runas-user",   0,      arg_string, &runas_string,
 119         "run as this user when connected to network", NULL
 120     },
 121     {   "chroot",       0,      arg_string, &chroot_string,
 122         "chroot directory to run in", NULL
 123     },
 124     {   "testing",      0,      arg_flag,   &testing_flag, NULL, NULL },
 125     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 126     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 127 };
 128
 129 static int num_args = sizeof(args) / sizeof(args[0]);
 130
 131 static void
 132 usage(int ret)
 133 {
 134     arg_printusage (args, num_args, NULL, "");
 135     exit (ret);
 136 }
 137
 138 static void
 139 add_one_address (krb5_context context, const char *str, int first)
 140 {
 141     krb5_error_code ret;
 142     krb5_addresses tmp;
 143
 144     ret = krb5_parse_address (context, str, &tmp);
 145     if (ret)
 146         krb5_err (context, 1, ret, "parse_address `%s'", str);
 147     if (first)
 148         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 149     else
 150         krb5_append_addresses(context, &explicit_addresses, &tmp);
 151     krb5_free_addresses (context, &tmp);
 152 }
 153
 154 krb5_kdc_configuration *
 155 configure(krb5_context context, int argc, char **argv, int *optidx)
 156 {
 157     krb5_kdc_configuration *config;
 158     krb5_error_code ret;
 159
 160     const char *p;
 161
 162     *optidx = 0;
 163
 164     while (getarg(args, num_args, argc, argv, optidx))
 165         warnx("error at argument `%s'", argv[*optidx]);
 166
 167     if (help_flag)
 168         usage (0);
 169
 170     if (version_flag) {
 171         print_version(NULL);
 172         exit(0);
 173     }
 174
 175     if (builtin_hdb_flag) {
 176         char *list;
 177         ret = hdb_list_builtin(context, &list);
 178         if (ret)
 179             krb5_err(context, 1, ret, "listing builtin hdb backends");
 180         printf("builtin hdb backends: %s\n", list);
 181         free(list);
 182         exit(0);
 183     }
 184
 185     if(detach_from_console == -1)
 186         detach_from_console = krb5_config_get_bool_default(context, NULL,
 187                                                            FALSE,
 188                                                            "kdc",
 189                                                            "detach", NULL);
 190
 191     if (detach_from_console && daemon_child == -1)
 192         daemon_child = roken_detach_prep(argc, argv, "--daemon-child");
 193
 194     {
 195         char **files;
 196         int aret;
 197
 198         if (config_file == NULL) {
 199             aret = asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 200             if (aret == -1 || config_file == NULL)
 201                 errx(1, "out of memory");
 202         }
 203
 204         ret = krb5_prepend_config_files_default(config_file, &files);
 205         if (ret)
 206             krb5_err(context, 1, ret, "getting configuration files");
 207
 208         ret = krb5_set_config_files(context, files);
 209         krb5_free_config_files(files);
 210         if(ret)
 211             krb5_err(context, 1, ret, "reading configuration files");
 212     }
 213
 214     ret = krb5_kdc_get_config(context, &config);
 215     if (ret)
 216         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 217
 218     kdc_openlog(context, "kdc", config);
 219
 220     ret = krb5_kdc_set_dbinfo(context, config);
 221     if (ret)
 222         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 223
 224     if (max_request_str) {
 225         ssize_t bytes;
 226
 227         if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 228             krb5_errx(context, 1, "--max-request must be non-negative");
 229         max_request_tcp = max_request_udp = bytes;
 230     }
 231
 232     if(max_request_tcp == 0){
 233         p = krb5_config_get_string (context,
 234                                     NULL,
 235                                     "kdc",
 236                                     "max-request",
 237                                     NULL);
 238         if (p) {
 239             ssize_t bytes;
 240
 241             if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 242                 krb5_errx(context, 1, "[kdc] max-request must be non-negative");
 243             max_request_tcp = max_request_udp = bytes;
 244         }
 245     }
 246
 247     if(require_preauth != -1)
 248         config->require_preauth = require_preauth;
 249
 250     if(port_str == NULL){
 251         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 252         if (p != NULL)
 253             port_str = strdup(p);
 254     }
 255
 256     explicit_addresses.len = 0;
 257
 258     if (addresses_str.num_strings) {
 259         int i;
 260
 261         for (i = 0; i < addresses_str.num_strings; ++i)
 262             add_one_address (context, addresses_str.strings[i], i == 0);
 263         free_getarg_strings (&addresses_str);
 264     } else {
 265         char **foo = krb5_config_get_strings (context, NULL,
 266                                               "kdc", "addresses", NULL);
 267
 268         if (foo != NULL) {
 269             add_one_address (context, *foo++, TRUE);
 270             while (*foo)
 271                 add_one_address (context, *foo++, FALSE);
 272         }
 273     }
 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(max_request_tcp == 0)
 291         max_request_tcp = 64 * 1024;
 292     if(max_request_udp == 0)
 293         max_request_udp = 64 * 1024;
 294
 295     if (port_str == NULL)
 296         port_str = "+";
 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
 312     krb5_kdc_plugin_init(context);
 313
 314     krb5_kdc_pkinit_config(context, config);
 315
 316     return config;
 317 }