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 /* Should we enable the HTTP hack? */
  59 int enable_http = -1;
  60
  61 /* Log over requests to the KDC */
  62 const char *request_log;
  63
  64 /* A string describing on what ports to listen */
  65 const char *port_str;
  66
  67 krb5_addresses explicit_addresses;
  68
  69 size_t max_request_udp;
  70 size_t max_request_tcp;
  71
  72
  73 static struct getarg_strings addresses_str;     /* addresses to listen on */
  74
  75 char *runas_string;
  76 char *chroot_string;
  77
  78
  79 static struct getargs args[] = {
  80     {
  81         "config-file",  'c',    arg_string,     &config_file,
  82         "location of config file",      "file"
  83     },
  84     {
  85         "require-preauth",      'p',    arg_negative_flag, &require_preauth,
  86         "don't require pa-data in as-reqs", NULL
  87     },
  88     {
  89         "max-request",  0,      arg_string, &max_request_str,
  90         "max size for a kdc-request", "size"
  91     },
  92     { "enable-http", 'H', arg_flag, &enable_http, "turn on HTTP support",
  93          NULL },
  94     {   "ports",        'P',    arg_string, rk_UNCONST(&port_str),
  95         "ports to listen to", "portspec"
  96     },
  97 #ifdef SUPPORT_DETACH
  98 #if DETACH_IS_DEFAULT
  99     {
 100         "detach",       'D',      arg_negative_flag, &detach_from_console,
 101         "don't detach from console", NULL
 102     },
 103 #else
 104     {
 105         "detach",       0 ,      arg_flag, &detach_from_console,
 106         "detach from console", NULL
 107     },
 108 #endif
 109 #endif
 110     {   "addresses",    0,      arg_strings, &addresses_str,
 111         "addresses to listen on", "list of addresses" },
 112     {   "disable-des",  0,      arg_flag, &disable_des,
 113         "disable DES", NULL },
 114     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 115         "list builtin hdb backends", NULL},
 116     {   "runas-user",   0,      arg_string, &runas_string,
 117         "run as this user when connected to network", NULL
 118     },
 119     {   "chroot",       0,      arg_string, &chroot_string,
 120         "chroot directory to run in", NULL
 121     },
 122     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 123     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 124 };
 125
 126 static int num_args = sizeof(args) / sizeof(args[0]);
 127
 128 static void
 129 usage(int ret)
 130 {
 131     arg_printusage (args, num_args, NULL, "");
 132     exit (ret);
 133 }
 134
 135 static void
 136 add_one_address (krb5_context context, const char *str, int first)
 137 {
 138     krb5_error_code ret;
 139     krb5_addresses tmp;
 140
 141     ret = krb5_parse_address (context, str, &tmp);
 142     if (ret)
 143         krb5_err (context, 1, ret, "parse_address `%s'", str);
 144     if (first)
 145         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 146     else
 147         krb5_append_addresses(context, &explicit_addresses, &tmp);
 148     krb5_free_addresses (context, &tmp);
 149 }
 150
 151 krb5_kdc_configuration *
 152 configure(krb5_context context, int argc, char **argv, int *optidx)
 153 {
 154     krb5_kdc_configuration *config;
 155     krb5_error_code ret;
 156
 157     const char *p;
 158
 159     *optidx = 0;
 160
 161     while(getarg(args, num_args, argc, argv, optidx))
 162         warnx("error at argument `%s'", argv[*optidx]);
 163
 164     if(help_flag)
 165         usage (0);
 166
 167     if (version_flag) {
 168         print_version(NULL);
 169         exit(0);
 170     }
 171
 172     if (builtin_hdb_flag) {
 173         char *list;
 174         ret = hdb_list_builtin(context, &list);
 175         if (ret)
 176             krb5_err(context, 1, ret, "listing builtin hdb backends");
 177         printf("builtin hdb backends: %s\n", list);
 178         free(list);
 179         exit(0);
 180     }
 181
 182     {
 183         char **files;
 184         int aret;
 185
 186         if (config_file == NULL) {
 187             aret = asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 188             if (aret == -1 || 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, "kdc", 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_tcp = max_request_udp = parse_bytes(max_request_str, NULL);
 214
 215     if(max_request_tcp == 0){
 216         p = krb5_config_get_string (context,
 217                                     NULL,
 218                                     "kdc",
 219                                     "max-request",
 220                                     NULL);
 221         if(p)
 222             max_request_tcp = max_request_udp = 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_http == -1)
 254         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 255                                            "enable-http", NULL);
 256
 257     if(request_log == NULL)
 258         request_log = krb5_config_get_string(context, NULL,
 259                                              "kdc",
 260                                              "kdc-request-log",
 261                                              NULL);
 262
 263     if (krb5_config_get_string(context, NULL, "kdc",
 264                                "enforce-transited-policy", NULL))
 265         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 266                   "use [kdc]transited-policy instead");
 267
 268 #ifdef SUPPORT_DETACH
 269     if(detach_from_console == -1)
 270         detach_from_console = krb5_config_get_bool_default(context, NULL,
 271                                                            DETACH_IS_DEFAULT,
 272                                                            "kdc",
 273                                                            "detach", NULL);
 274 #endif /* SUPPORT_DETACH */
 275
 276     if(max_request_tcp == 0)
 277         max_request_tcp = 64 * 1024;
 278     if(max_request_udp == 0)
 279         max_request_udp = 64 * 1024;
 280
 281     if (port_str == NULL)
 282         port_str = "+";
 283
 284     if(disable_des == -1)
 285         disable_des = krb5_config_get_bool_default(context, NULL,
 286                                                    FALSE,
 287                                                    "kdc",
 288                                                    "disable-des", NULL);
 289     if(disable_des) {
 290         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 291         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 292         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 293         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 294         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 295         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 296     }
 297
 298     krb5_kdc_windc_init(context);
 299
 300     krb5_kdc_pkinit_config(context, config);
 301
 302     return config;
 303 }