kcm/config.c

   1 /*
   2  * Copyright (c) 2005, PADL Software Pty Ltd.
   3  * All rights reserved.
   4  *
   5  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "kcm_locl.h"
  36 #include <getarg.h>
  37 #include <parse_bytes.h>
  38
  39 static const char *config_file; /* location of kcm config file */
  40
  41 size_t max_request = 0;         /* maximal size of a request */
  42 char *socket_path = NULL;
  43 char *door_path = NULL;
  44
  45 static char *max_request_str;   /* `max_request' as a string */
  46
  47 int detach_from_console = -1;
  48 int daemon_child = -1;
  49
  50 static const char *system_cache_name = NULL;
  51 static const char *system_keytab = NULL;
  52 static const char *system_principal = NULL;
  53 static const char *system_server = NULL;
  54 static const char *system_perms = NULL;
  55 static const char *system_user = NULL;
  56 static const char *system_group = NULL;
  57
  58 static const char *renew_life = NULL;
  59 static const char *ticket_life = NULL;
  60
  61 int launchd_flag = 0;
  62 int disallow_getting_krbtgt = 0;
  63 int name_constraints = -1;
  64
  65 static int help_flag;
  66 static int version_flag;
  67
  68 static struct getargs args[] = {
  69     {
  70         "cache-name",   0,      arg_string,     &system_cache_name,
  71         "system cache name", "cachename"
  72     },
  73     {
  74         "config-file",  'c',    arg_string,     &config_file,
  75         "location of config file",      "file"
  76     },
  77     {
  78         "group",        'g',    arg_string,     &system_group,
  79         "system cache group",   "group"
  80     },
  81     {
  82         "max-request",  0,      arg_string, &max_request,
  83         "max size for a kcm-request", "size"
  84     },
  85     {
  86         "launchd",      0,      arg_flag, &launchd_flag,
  87         "when in use by launchd", NULL
  88     },
  89     {
  90         "detach",       0 ,      arg_flag, &detach_from_console,
  91         "detach from console", NULL
  92     },
  93     {
  94         "daemon-child",       0 ,      arg_integer, &daemon_child,
  95         "private argument, do not use", NULL
  96     },
  97     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
  98     {
  99         "system-principal",     'k',    arg_string,     &system_principal,
 100         "system principal name",        "principal"
 101     },
 102     {
 103         "lifetime",     'l', arg_string, &ticket_life,
 104         "lifetime of system tickets", "time"
 105     },
 106     {
 107         "mode",         'm', arg_string, &system_perms,
 108         "octal mode of system cache", "mode"
 109     },
 110     {
 111         "name-constraints",     'n', arg_negative_flag, &name_constraints,
 112         "disable credentials cache name constraints", NULL
 113     },
 114     {
 115         "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
 116         "disable fetching krbtgt from the cache", NULL
 117     },
 118     {
 119         "renewable-life",       'r', arg_string, &renew_life,
 120         "renewable lifetime of system tickets", "time"
 121     },
 122     {
 123         "socket-path",          's', arg_string, &socket_path,
 124         "path to kcm domain socket", "path"
 125     },
 126 #ifdef HAVE_DOOR_CREATE
 127     {
 128         "door-path",            's', arg_string, &door_path,
 129         "path to kcm door", "path"
 130     },
 131 #endif
 132     {
 133         "server",               'S', arg_string, &system_server,
 134         "server to get system ticket for", "principal"
 135     },
 136     {
 137         "keytab",       't',    arg_string,     &system_keytab,
 138         "system keytab name",   "keytab"
 139     },
 140     {
 141         "user",         'u',    arg_string,     &system_user,
 142         "system cache owner",   "user"
 143     },
 144     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 145 };
 146
 147 static int num_args = sizeof(args) / sizeof(args[0]);
 148
 149 static void
 150 usage(int ret)
 151 {
 152     arg_printusage (args, num_args, NULL, "");
 153     exit (ret);
 154 }
 155
 156 static int parse_owners(kcm_ccache ccache)
 157 {
 158     uid_t uid = 0;
 159     gid_t gid = 0;
 160     struct passwd *pw;
 161     struct group *gr;
 162     int uid_p = 0;
 163     int gid_p = 0;
 164
 165     if (system_user != NULL) {
 166         if (isdigit((unsigned char)system_user[0])) {
 167             pw = getpwuid(atoi(system_user));
 168         } else {
 169             pw = getpwnam(system_user);
 170         }
 171         if (pw == NULL) {
 172             return errno;
 173         }
 174
 175         system_user = strdup(pw->pw_name);
 176         if (system_user == NULL) {
 177             return ENOMEM;
 178         }
 179
 180         uid = pw->pw_uid; uid_p = 1;
 181         gid = pw->pw_gid; gid_p = 1;
 182     }
 183
 184     if (system_group != NULL) {
 185         if (isdigit((unsigned char)system_group[0])) {
 186             gr = getgrgid(atoi(system_group));
 187         } else {
 188             gr = getgrnam(system_group);
 189         }
 190         if (gr == NULL) {
 191             return errno;
 192         }
 193
 194         gid = gr->gr_gid; gid_p = 1;
 195     }
 196
 197     if (uid_p)
 198         ccache->uid = uid;
 199     else
 200         ccache->uid = 0; /* geteuid() XXX */
 201
 202     if (gid_p)
 203         ccache->gid = gid;
 204     else
 205         ccache->gid = 0; /* getegid() XXX */
 206
 207     return 0;
 208 }
 209
 210 static const char *
 211 kcm_system_config_get_string(const char *string)
 212 {
 213     return krb5_config_get_string(kcm_context, NULL, "kcm",
 214                                   "system_ccache", string, NULL);
 215 }
 216
 217 static krb5_error_code
 218 ccache_init_system(void)
 219 {
 220     kcm_ccache ccache;
 221     krb5_error_code ret;
 222
 223     if (system_cache_name == NULL)
 224         system_cache_name = kcm_system_config_get_string("cc_name");
 225
 226     ret = kcm_ccache_new(kcm_context,
 227                          system_cache_name ? system_cache_name : "SYSTEM",
 228                          &ccache);
 229     if (ret)
 230         return ret;
 231
 232     ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
 233     ccache->flags |= KCM_FLAGS_USE_KEYTAB;
 234
 235     ret = parse_owners(ccache);
 236     if (ret)
 237         return ret;
 238
 239     ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
 240     if (ret) {
 241         kcm_release_ccache(kcm_context, ccache);
 242         return ret;
 243     }
 244
 245     if (system_server == NULL)
 246         system_server = kcm_system_config_get_string("server");
 247
 248     if (system_server != NULL) {
 249         ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
 250         if (ret) {
 251             kcm_release_ccache(kcm_context, ccache);
 252             return ret;
 253         }
 254     }
 255
 256     if (system_keytab == NULL)
 257         system_keytab = kcm_system_config_get_string("keytab_name");
 258
 259     if (system_keytab != NULL) {
 260         ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
 261     } else {
 262         ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
 263     }
 264     if (ret) {
 265         kcm_release_ccache(kcm_context, ccache);
 266         return ret;
 267     }
 268
 269     if (renew_life == NULL)
 270         renew_life = kcm_system_config_get_string("renew_life");
 271
 272     if (renew_life == NULL)
 273         renew_life = "1 month";
 274
 275     if (renew_life != NULL) {
 276         ccache->renew_life = parse_time(renew_life, "s");
 277         if (ccache->renew_life < 0) {
 278             kcm_release_ccache(kcm_context, ccache);
 279             return EINVAL;
 280         }
 281     }
 282
 283     if (ticket_life == NULL)
 284         ticket_life = kcm_system_config_get_string("ticket_life");
 285
 286     if (ticket_life != NULL) {
 287         ccache->tkt_life = parse_time(ticket_life, "s");
 288         if (ccache->tkt_life < 0) {
 289             kcm_release_ccache(kcm_context, ccache);
 290             return EINVAL;
 291         }
 292     }
 293
 294     if (system_perms == NULL)
 295         system_perms = kcm_system_config_get_string("mode");
 296
 297     if (system_perms != NULL) {
 298         int mode;
 299
 300         if (sscanf(system_perms, "%o", &mode) != 1)
 301             return EINVAL;
 302
 303         ccache->mode = mode;
 304     }
 305
 306     if (disallow_getting_krbtgt == -1) {
 307         disallow_getting_krbtgt =
 308             krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
 309                                          "disallow-getting-krbtgt", NULL);
 310     }
 311
 312     /* enqueue default actions for credentials cache */
 313     ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
 314
 315     kcm_release_ccache(kcm_context, ccache); /* retained by event queue */
 316
 317     return ret;
 318 }
 319
 320 void
 321 kcm_configure(int argc, char **argv)
 322 {
 323     krb5_error_code ret;
 324     int optidx = 0;
 325     const char *p;
 326
 327     while (getarg(args, num_args, argc, argv, &optidx))
 328         warnx("error at argument `%s'", argv[optidx]);
 329
 330     if (help_flag)
 331         usage (0);
 332
 333     if (version_flag) {
 334         print_version(NULL);
 335         exit(0);
 336     }
 337
 338     argc -= optidx;
 339     argv += optidx;
 340
 341     if (argc != 0)
 342         usage(1);
 343
 344     {
 345         char **files;
 346
 347         if(config_file == NULL)
 348             config_file = _PATH_KCM_CONF;
 349
 350         ret = krb5_prepend_config_files_default(config_file, &files);
 351         if (ret)
 352             krb5_err(kcm_context, 1, ret, "getting configuration files");
 353
 354         ret = krb5_set_config_files(kcm_context, files);
 355         krb5_free_config_files(files);
 356         if(ret)
 357             krb5_err(kcm_context, 1, ret, "reading configuration files");
 358     }
 359
 360     if(max_request_str)
 361         max_request = parse_bytes(max_request_str, NULL);
 362
 363     if(max_request == 0){
 364         p = krb5_config_get_string (kcm_context,
 365                                     NULL,
 366                                     "kcm",
 367                                     "max-request",
 368                                     NULL);
 369         if(p)
 370             max_request = parse_bytes(p, NULL);
 371     }
 372
 373     if (system_principal == NULL) {
 374         system_principal = kcm_system_config_get_string("principal");
 375     }
 376
 377     if (system_principal != NULL) {
 378         ret = ccache_init_system();
 379         if (ret)
 380             krb5_err(kcm_context, 1, ret, "initializing system ccache");
 381     }
 382
 383     if(detach_from_console == -1)
 384         detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
 385                                                            FALSE,
 386                                                            "kcm",
 387                                                            "detach", NULL);
 388     kcm_openlog();
 389     if(max_request == 0)
 390         max_request = 64 * 1024;
 391 }
 392