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 #define MAX_REQUEST_MAX 67108864ll /* 64MB, the maximum accepted value of max_request */
  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
  56 static int builtin_hdb_flag;
  57 int testing_flag;
  58 static int help_flag;
  59 static int version_flag;
  60
  61 /* Should we enable the HTTP hack? */
  62 int enable_http = -1;
  63
  64 /* Log over requests to the KDC */
  65 const char *request_log;
  66
  67 /* A string describing on what ports to listen */
  68 const char *port_str;
  69
  70 krb5_addresses explicit_addresses;
  71
  72 size_t max_request_udp;
  73 size_t max_request_tcp;
  74
  75
  76 static struct getarg_strings addresses_str;     /* addresses to listen on */
  77
  78 char *runas_string;
  79 char *chroot_string;
  80
  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", NULL
  90     },
  91     {
  92         "max-request",  0,      arg_string, &max_request_str,
  93         "max size for a kdc-request", "size"
  94     },
  95     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support",
  96          NULL },
  97     {   "ports",        'P',    arg_string, rk_UNCONST(&port_str),
  98         "ports to listen to", "portspec"
  99     },
 100     {
 101         "detach",       0 ,      arg_flag, &detach_from_console,
 102         "detach from console", NULL
 103     },
 104     {
 105         "daemon-child",       0 ,      arg_flag, &daemon_child,
 106         "private argument, do not use", NULL
 107     },
 108 #ifdef __APPLE__
 109     {
 110         "bonjour",       0 ,      arg_flag, &do_bonjour,
 111         "private argument, do not use", NULL
 112     },
 113 #endif
 114     {   "addresses",    0,      arg_strings, &addresses_str,
 115         "addresses to listen on", "list of addresses" },
 116     {   "disable-des",  0,      arg_flag, &disable_des,
 117         "disable DES", NULL },
 118     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 119         "list builtin hdb backends", NULL},
 120     {   "runas-user",   0,      arg_string, &runas_string,
 121         "run as this user when connected to network", NULL
 122     },
 123     {   "chroot",       0,      arg_string, &chroot_string,
 124         "chroot directory to run in", NULL
 125     },
 126     {   "testing",      0,      arg_flag,   &testing_flag, NULL, NULL },
 127     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 128     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 129 };
 130
 131 static int num_args = sizeof(args) / sizeof(args[0]);
 132
 133 static void
 134 usage(int ret)
 135 {
 136     arg_printusage (args, num_args, NULL, "");
 137     exit (ret);
 138 }
 139
 140 static void
 141 add_one_address (krb5_context context, const char *str, int first)
 142 {
 143     krb5_error_code ret;
 144     krb5_addresses tmp;
 145
 146     ret = krb5_parse_address (context, str, &tmp);
 147     if (ret)
 148         krb5_err (context, 1, ret, "parse_address `%s'", str);
 149     if (first)
 150         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 151     else
 152         krb5_append_addresses(context, &explicit_addresses, &tmp);
 153     krb5_free_addresses (context, &tmp);
 154 }
 155
 156 krb5_kdc_configuration *
 157 configure(krb5_context context, int argc, char **argv, int *optidx)
 158 {
 159     krb5_kdc_configuration *config;
 160     krb5_error_code ret;
 161
 162     const char *p;
 163
 164     *optidx = 0;
 165
 166     while (getarg(args, num_args, argc, argv, optidx))
 167         warnx("error at argument `%s'", argv[*optidx]);
 168
 169     if (help_flag)
 170         usage (0);
 171
 172     if (version_flag) {
 173         print_version(NULL);
 174         exit(0);
 175     }
 176
 177     if (builtin_hdb_flag) {
 178         char *list;
 179         ret = hdb_list_builtin(context, &list);
 180         if (ret)
 181             krb5_err(context, 1, ret, "listing builtin hdb backends");
 182         printf("builtin hdb backends: %s\n", list);
 183         free(list);
 184         exit(0);
 185     }
 186
 187     if(detach_from_console == -1)
 188         detach_from_console = krb5_config_get_bool_default(context, NULL,
 189                                                            FALSE,
 190                                                            "kdc",
 191                                                            "detach", NULL);
 192
 193     if (detach_from_console && daemon_child == -1)
 194         daemon_child = roken_detach_prep(argc, argv, "--daemon-child");
 195
 196     {
 197         char **files;
 198         int aret;
 199
 200         if (config_file == NULL) {
 201             aret = asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 202             if (aret == -1 || config_file == NULL)
 203                 errx(1, "out of memory");
 204         }
 205
 206         ret = krb5_prepend_config_files_default(config_file, &files);
 207         if (ret)
 208             krb5_err(context, 1, ret, "getting configuration files");
 209
 210         ret = krb5_set_config_files(context, files);
 211         krb5_free_config_files(files);
 212         if(ret)
 213             krb5_err(context, 1, ret, "reading configuration files");
 214     }
 215
 216     ret = krb5_kdc_get_config(context, &config);
 217     if (ret)
 218         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 219
 220     kdc_openlog(context, "kdc", config);
 221
 222     ret = krb5_kdc_set_dbinfo(context, config);
 223     if (ret)
 224         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 225
 226     if (max_request_str) {
 227         int64_t bytes;
 228
 229         if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 230             krb5_errx(context, 1, "--max-request must be non-negative");
 231
 232         if (bytes > MAX_REQUEST_MAX)
 233             krb5_errx(context, 1, "--max-request size is too big "
 234                       "(must be smaller than %lld)", MAX_REQUEST_MAX);
 235
 236         max_request_tcp = max_request_udp = bytes;
 237     }
 238
 239     if(max_request_tcp == 0){
 240         p = krb5_config_get_string (context,
 241                                     NULL,
 242                                     "kdc",
 243                                     "max-request",
 244                                     NULL);
 245         if (p) {
 246             int64_t bytes;
 247
 248             if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 249                 krb5_errx(context, 1, "[kdc] max-request must be non-negative");
 250
 251             if (bytes > MAX_REQUEST_MAX)
 252                 krb5_errx(context, 1, "[kdc] max-request size is too big "
 253                           "(must be smaller than %lld)", MAX_REQUEST_MAX);
 254
 255             max_request_tcp = max_request_udp = bytes;
 256         }
 257     }
 258
 259     if(require_preauth != -1)
 260         config->require_preauth = require_preauth;
 261
 262     if(port_str == NULL){
 263         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 264         if (p != NULL)
 265             port_str = strdup(p);
 266     }
 267
 268     explicit_addresses.len = 0;
 269
 270     if (addresses_str.num_strings) {
 271         int i;
 272
 273         for (i = 0; i < addresses_str.num_strings; ++i)
 274             add_one_address (context, addresses_str.strings[i], i == 0);
 275         free_getarg_strings (&addresses_str);
 276     } else {
 277         char **foo = krb5_config_get_strings (context, NULL,
 278                                               "kdc", "addresses", NULL);
 279
 280         if (foo != NULL) {
 281             add_one_address (context, *foo++, TRUE);
 282             while (*foo)
 283                 add_one_address (context, *foo++, FALSE);
 284         }
 285     }
 286
 287     if(enable_http == -1)
 288         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 289                                            "enable-http", NULL);
 290
 291     if(request_log == NULL)
 292         request_log = krb5_config_get_string(context, NULL,
 293                                              "kdc",
 294                                              "kdc-request-log",
 295                                              NULL);
 296
 297     if (krb5_config_get_string(context, NULL, "kdc",
 298                                "enforce-transited-policy", NULL))
 299         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 300                   "use [kdc]transited-policy instead");
 301
 302     if(max_request_tcp == 0)
 303         max_request_tcp = 64 * 1024;
 304     if(max_request_udp == 0)
 305         max_request_udp = 64 * 1024;
 306
 307     if (port_str == NULL)
 308         port_str = "+";
 309
 310     if(disable_des == -1)
 311         disable_des = krb5_config_get_bool_default(context, NULL,
 312                                                    FALSE,
 313                                                    "kdc",
 314                                                    "disable-des", NULL);
 315     if(disable_des) {
 316         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 317         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 318         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 319         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 320         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 321         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 322     }
 323
 324     krb5_kdc_plugin_init(context);
 325
 326     krb5_kdc_pkinit_config(context, config);
 327
 328     return config;
 329 }