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     {
  98         "detach",       0 ,      arg_flag, &detach_from_console,
  99         "detach from console", NULL
 100     },
 101     {
 102         "daemon-child",       0 ,      arg_flag, &daemon_child,
 103         "private argument, do not use", NULL
 104     },
 105     {   "addresses",    0,      arg_strings, &addresses_str,
 106         "addresses to listen on", "list of addresses" },
 107     {   "disable-des",  0,      arg_flag, &disable_des,
 108         "disable DES", NULL },
 109     {   "builtin-hdb",  0,      arg_flag,   &builtin_hdb_flag,
 110         "list builtin hdb backends", NULL},
 111     {   "runas-user",   0,      arg_string, &runas_string,
 112         "run as this user when connected to network", NULL
 113     },
 114     {   "chroot",       0,      arg_string, &chroot_string,
 115         "chroot directory to run in", NULL
 116     },
 117     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 118     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 119 };
 120
 121 static int num_args = sizeof(args) / sizeof(args[0]);
 122
 123 static void
 124 usage(int ret)
 125 {
 126     arg_printusage (args, num_args, NULL, "");
 127     exit (ret);
 128 }
 129
 130 static void
 131 add_one_address (krb5_context context, const char *str, int first)
 132 {
 133     krb5_error_code ret;
 134     krb5_addresses tmp;
 135
 136     ret = krb5_parse_address (context, str, &tmp);
 137     if (ret)
 138         krb5_err (context, 1, ret, "parse_address `%s'", str);
 139     if (first)
 140         krb5_copy_addresses(context, &tmp, &explicit_addresses);
 141     else
 142         krb5_append_addresses(context, &explicit_addresses, &tmp);
 143     krb5_free_addresses (context, &tmp);
 144 }
 145
 146 krb5_kdc_configuration *
 147 configure(krb5_context context, int argc, char **argv, int *optidx)
 148 {
 149     krb5_kdc_configuration *config;
 150     krb5_error_code ret;
 151
 152     const char *p;
 153
 154     *optidx = 0;
 155
 156     while (getarg(args, num_args, argc, argv, optidx))
 157         warnx("error at argument `%s'", argv[*optidx]);
 158
 159     if (help_flag)
 160         usage (0);
 161
 162     if (version_flag) {
 163         print_version(NULL);
 164         exit(0);
 165     }
 166
 167     if (builtin_hdb_flag) {
 168         char *list;
 169         ret = hdb_list_builtin(context, &list);
 170         if (ret)
 171             krb5_err(context, 1, ret, "listing builtin hdb backends");
 172         printf("builtin hdb backends: %s\n", list);
 173         free(list);
 174         exit(0);
 175     }
 176
 177     if(detach_from_console == -1)
 178         detach_from_console = krb5_config_get_bool_default(context, NULL,
 179                                                            FALSE,
 180                                                            "kdc",
 181                                                            "detach", NULL);
 182
 183     if (detach_from_console && daemon_child == -1)
 184         roken_detach_prep(argc, argv, "--daemon-child");
 185
 186     {
 187         char **files;
 188         int aret;
 189
 190         if (config_file == NULL) {
 191             aret = asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 192             if (aret == -1 || config_file == NULL)
 193                 errx(1, "out of memory");
 194         }
 195
 196         ret = krb5_prepend_config_files_default(config_file, &files);
 197         if (ret)
 198             krb5_err(context, 1, ret, "getting configuration files");
 199
 200         ret = krb5_set_config_files(context, files);
 201         krb5_free_config_files(files);
 202         if(ret)
 203             krb5_err(context, 1, ret, "reading configuration files");
 204     }
 205
 206     ret = krb5_kdc_get_config(context, &config);
 207     if (ret)
 208         krb5_err(context, 1, ret, "krb5_kdc_default_config");
 209
 210     kdc_openlog(context, "kdc", config);
 211
 212     ret = krb5_kdc_set_dbinfo(context, config);
 213     if (ret)
 214         krb5_err(context, 1, ret, "krb5_kdc_set_dbinfo");
 215
 216     if(max_request_str)
 217         max_request_tcp = max_request_udp = parse_bytes(max_request_str, NULL);
 218
 219     if(max_request_tcp == 0){
 220         p = krb5_config_get_string (context,
 221                                     NULL,
 222                                     "kdc",
 223                                     "max-request",
 224                                     NULL);
 225         if(p)
 226             max_request_tcp = max_request_udp = parse_bytes(p, NULL);
 227     }
 228
 229     if(require_preauth != -1)
 230         config->require_preauth = require_preauth;
 231
 232     if(port_str == NULL){
 233         p = krb5_config_get_string(context, NULL, "kdc", "ports", NULL);
 234         if (p != NULL)
 235             port_str = strdup(p);
 236     }
 237
 238     explicit_addresses.len = 0;
 239
 240     if (addresses_str.num_strings) {
 241         int i;
 242
 243         for (i = 0; i < addresses_str.num_strings; ++i)
 244             add_one_address (context, addresses_str.strings[i], i == 0);
 245         free_getarg_strings (&addresses_str);
 246     } else {
 247         char **foo = krb5_config_get_strings (context, NULL,
 248                                               "kdc", "addresses", NULL);
 249
 250         if (foo != NULL) {
 251             add_one_address (context, *foo++, TRUE);
 252             while (*foo)
 253                 add_one_address (context, *foo++, FALSE);
 254         }
 255     }
 256
 257     if(enable_http == -1)
 258         enable_http = krb5_config_get_bool(context, NULL, "kdc",
 259                                            "enable-http", NULL);
 260
 261     if(request_log == NULL)
 262         request_log = krb5_config_get_string(context, NULL,
 263                                              "kdc",
 264                                              "kdc-request-log",
 265                                              NULL);
 266
 267     if (krb5_config_get_string(context, NULL, "kdc",
 268                                "enforce-transited-policy", NULL))
 269         krb5_errx(context, 1, "enforce-transited-policy deprecated, "
 270                   "use [kdc]transited-policy instead");
 271
 272     if(max_request_tcp == 0)
 273         max_request_tcp = 64 * 1024;
 274     if(max_request_udp == 0)
 275         max_request_udp = 64 * 1024;
 276
 277     if (port_str == NULL)
 278         port_str = "+";
 279
 280     if(disable_des == -1)
 281         disable_des = krb5_config_get_bool_default(context, NULL,
 282                                                    FALSE,
 283                                                    "kdc",
 284                                                    "disable-des", NULL);
 285     if(disable_des) {
 286         krb5_enctype_disable(context, ETYPE_DES_CBC_CRC);
 287         krb5_enctype_disable(context, ETYPE_DES_CBC_MD4);
 288         krb5_enctype_disable(context, ETYPE_DES_CBC_MD5);
 289         krb5_enctype_disable(context, ETYPE_DES_CBC_NONE);
 290         krb5_enctype_disable(context, ETYPE_DES_CFB64_NONE);
 291         krb5_enctype_disable(context, ETYPE_DES_PCBC_NONE);
 292     }
 293
 294     krb5_kdc_windc_init(context);
 295
 296     krb5_kdc_pkinit_config(context, config);
 297
 298     return config;
 299 }