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 static int enable_v4 = -1;
  54 static int enable_kaserver = -1;
  55 static int enable_524 = -1;
  56 static int enable_v4_cross_realm = -1;
  57
  58 static int builtin_hdb_flag;
  59 static int help_flag;
  60 static int version_flag;
  61
  62 static struct getarg_strings addresses_str;     /* addresses to listen on */
  63
  64 static char *v4_realm;
  65
  66 char *runas_string;
  67 char *chroot_string;
  68
  69
  70 static struct getargs args[] = {
  71     {
  72         "config-file",  'c',    arg_string,     &config_file,
  73         "location of config file",      "file"
  74     },
  75     {
  76         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  77         "don't require pa-data in as-reqs", NULL
  78     },
  79     {
  80         "max-request",  0,      arg_string, &max_request_str,
  81         "max size for a kdc-request", "size"
  82     },
  83     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support",
  84          NULL },
  85     {   "524",          0,      arg_negative_flag, &enable_524,
  86         "don't respond to 524 requests", NULL
  87     },
  88     {
  89         "kaserver", 'K', arg_flag,   &enable_kaserver,
  90         "enable kaserver support", NULL
  91     },
  92     {   "kerberos4",    0,      arg_flag, &enable_v4,
  93         "respond to kerberos 4 requests", NULL
  94     },
  95     {
  96         "v4-realm",     'r',    arg_string, &v4_realm,
  97         "realm to serve v4-requests for", NULL
  98     },
  99     {   "kerberos4-cross-realm",        0,      arg_flag,
 100         &enable_v4_cross_realm,
 101         "respond to kerberos 4 requests from foreign realms", NULL
 102     },
 103     {   "ports",        'P',    arg_string, rk_UNCONST(&port_str),
 104         "ports to listen to", "portspec"
 105     },
 106 #ifdef SUPPORT_DETACH
 107 #if DETACH_IS_DEFAULT
 108     {
 109         "detach",       'D',      arg_negative_flag, &detach_from_console,
 110         "don't detach from console", NULL
 111     },
 112 #else
 113     {
 114         "detach",       0 ,      arg_flag, &detach_from_console,
 115         "detach from console", NULL
 116     },
 117 #endif
 118 #endif
 119     {   "addresses",    0,      arg_strings, &addresses_str,
 120         "addresses to listen on", "list of addresses" },
 121     {   "disable-des",  0,      arg_flag, &disable_des,
 122         "disable DES", NULL },
 123     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 124         "list builtin hdb backends", NULL},
 125     {   "runas-user",   0,      arg_string, &runas_string,
 126         "run as this user when connected to network", NULL
 127     },
 128     {   "chroot",       0,      arg_string, &chroot_string,
 129         "chroot directory to run in", NULL
 130     },
 131     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 132     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 133 };
 134
 135 static int num_args = sizeof(args) / sizeof(args[0]);
 136
 137 static void
 138 usage(int ret)
 139 {
 140     arg_printusage (args, num_args, NULL, "");
 141     exit (ret);
 142 }
 143
 144 static void
 145 add_one_address (krb5_context context, const char *str, int first)
 146 {
 147     krb5_error_code ret;
 148     krb5_addresses tmp;
 149
 150     ret = krb5_parse_address (context, str, &tmp);
 151     if (ret)
 152         krb5_err (context, 1, ret, "parse_address `%s'", str);
 153     if (first)
 154         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 155     else
 156         krb5_append_addresses(context, &explicit_addresses, &tmp);
 157     krb5_free_addresses (context, &tmp);
 158 }
 159
 160 krb5_kdc_configuration *
 161 configure(krb5_context context, int argc, char **argv)
 162 {
 163     krb5_kdc_configuration *config;
 164     krb5_error_code ret;
 165     int optidx = 0;
 166     const char *p;
 167
 168     while(getarg(args, num_args, argc, argv, &optidx))
 169         warnx("error at argument `%s'", argv[optidx]);
 170
 171     if(help_flag)
 172         usage (0);
 173
 174     if (version_flag) {
 175         print_version(NULL);
 176         exit(0);
 177     }
 178
 179     if (builtin_hdb_flag) {
 180         char *list;
 181         ret = hdb_list_builtin(context, &list);
 182         if (ret)
 183             krb5_err(context, 1, ret, "listing builtin hdb backends");
 184         printf("builtin hdb backends: %s\n", list);
 185         free(list);
 186         exit(0);
 187     }
 188
 189     argc -= optidx;
 190     argv += optidx;
 191
 192     if (argc != 0)
 193         usage(1);
 194
 195     {
 196         char **files;
 197
 198         if (config_file == NULL) {
 199             asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 200             if (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         max_request_tcp = max_request_udp = parse_bytes(max_request_str, NULL);
 226
 227     if(max_request_tcp == 0){
 228         p = krb5_config_get_string (context,
 229                                     NULL,
 230                                     "kdc",
 231                                     "max-request",
 232                                     NULL);
 233         if(p)
 234             max_request_tcp = max_request_udp = parse_bytes(p, NULL);
 235     }
 236
 237     if(require_preauth != -1)
 238         config->require_preauth = require_preauth;
 239
 240     if(port_str == NULL){
 241         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 242         if (p != NULL)
 243             port_str = strdup(p);
 244     }
 245
 246     explicit_addresses.len = 0;
 247
 248     if (addresses_str.num_strings) {
 249         int i;
 250
 251         for (i = 0; i < addresses_str.num_strings; ++i)
 252             add_one_address (context, addresses_str.strings[i], i == 0);
 253         free_getarg_strings (&addresses_str);
 254     } else {
 255         char **foo = krb5_config_get_strings (context, NULL,
 256                                               "kdc", "addresses", NULL);
 257
 258         if (foo != NULL) {
 259             add_one_address (context, *foo++, TRUE);
 260             while (*foo)
 261                 add_one_address (context, *foo++, FALSE);
 262         }
 263     }
 264
 265     if(enable_v4 != -1)
 266         config->enable_v4 = enable_v4;
 267
 268     if(enable_v4_cross_realm != -1)
 269         config->enable_v4_cross_realm = enable_v4_cross_realm;
 270
 271     if(enable_524 != -1)
 272         config->enable_524 = enable_524;
 273
 274     if(enable_http == -1)
 275         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 276                                            "enable-http", NULL);
 277
 278     if(request_log == NULL)
 279         request_log = krb5_config_get_string(context, NULL,
 280                                              "kdc",
 281                                              "kdc-request-log",
 282                                              NULL);
 283
 284     if (krb5_config_get_string(context, NULL, "kdc",
 285                                "enforce-transited-policy", NULL))
 286         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 287                   "use [kdc]transited-policy instead");
 288
 289     if (enable_kaserver != -1)
 290         config->enable_kaserver = enable_kaserver;
 291
 292 #ifdef SUPPORT_DETACH
 293     if(detach_from_console == -1)
 294         detach_from_console = krb5_config_get_bool_default(context, NULL,
 295                                                            DETACH_IS_DEFAULT,
 296                                                            "kdc",
 297                                                            "detach", NULL);
 298 #endif /* SUPPORT_DETACH */
 299
 300     if(max_request_tcp == 0)
 301         max_request_tcp = 64 * 1024;
 302     if(max_request_udp == 0)
 303         max_request_udp = 64 * 1024;
 304
 305     if (port_str == NULL)
 306         port_str = "+";
 307
 308     if (v4_realm)
 309         config->v4_realm = v4_realm;
 310
 311     if(config->v4_realm == NULL && (config->enable_kaserver || config->enable_v4))
 312         krb5_errx(context, 1, "Kerberos 4 enabled but no realm configured");
 313
 314     if(disable_des == -1)
 315         disable_des = krb5_config_get_bool_default(context, NULL,
 316                                                    FALSE,
 317                                                    "kdc",
 318                                                    "disable-des", NULL);
 319     if(disable_des) {
 320         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 321         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 322         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 323         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 324         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 325         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 326
 327         kdc_log(context, config,
 328                 0, "DES was disabled, turned off Kerberos V4, 524 "
 329                 "and kaserver");
 330         config->enable_v4 = 0;
 331         config->enable_524 = 0;
 332         config->enable_kaserver = 0;
 333     }
 334
 335     krb5_kdc_windc_init(context);
 336
 337     krb5_kdc_pkinit_config(context, config);
 338
 339     return config;
 340 }