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 #ifdef SUPPORT_DETACH
  48 int detach_from_console = -1;
  49 #define DETACH_IS_DEFAULT FALSE
  50 #endif
  51
  52 static const char *system_cache_name = NULL;
  53 static const char *system_keytab = NULL;
  54 static const char *system_principal = NULL;
  55 static const char *system_server = NULL;
  56 static const char *system_perms = NULL;
  57 static const char *system_user = NULL;
  58 static const char *system_group = NULL;
  59
  60 static const char *renew_life = NULL;
  61 static const char *ticket_life = NULL;
  62
  63 int launchd_flag = 0;
  64 int disallow_getting_krbtgt = 0;
  65 int name_constraints = -1;
  66
  67 static int help_flag;
  68 static int version_flag;
  69
  70 static struct getargs args[] = {
  71     {
  72         "cache-name",   0,      arg_string,     &system_cache_name,
  73         "system cache name", "cachename"
  74     },
  75     {
  76         "config-file",  'c',    arg_string,     &config_file,
  77         "location of config file",      "file"
  78     },
  79     {
  80         "group",        'g',    arg_string,     &system_group,
  81         "system cache group",   "group"
  82     },
  83     {
  84         "max-request",  0,      arg_string, &max_request,
  85         "max size for a kcm-request", "size"
  86     },
  87     {
  88         "launchd",      0,      arg_flag, &launchd_flag,
  89         "when in use by launchd"
  90     },
  91 #ifdef SUPPORT_DETACH
  92 #if DETACH_IS_DEFAULT
  93     {
  94         "detach",       'D',      arg_negative_flag, &detach_from_console,
  95         "don't detach from console"
  96     },
  97 #else
  98     {
  99         "detach",       0 ,      arg_flag, &detach_from_console,
 100         "detach from console"
 101     },
 102 #endif
 103 #endif
 104     {   "help",         'h',    arg_flag,   &help_flag },
 105     {
 106         "system-principal",     'k',    arg_string,     &system_principal,
 107         "system principal name",        "principal"
 108     },
 109     {
 110         "lifetime",     'l', arg_string, &ticket_life,
 111         "lifetime of system tickets", "time"
 112     },
 113     {
 114         "mode",         'm', arg_string, &system_perms,
 115         "octal mode of system cache", "mode"
 116     },
 117     {
 118         "name-constraints",     'n', arg_negative_flag, &name_constraints,
 119         "disable credentials cache name constraints"
 120     },
 121     {
 122         "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
 123         "disable fetching krbtgt from the cache"
 124     },
 125     {
 126         "renewable-life",       'r', arg_string, &renew_life,
 127         "renewable lifetime of system tickets", "time"
 128     },
 129     {
 130         "socket-path",          's', arg_string, &socket_path,
 131         "path to kcm domain socket", "path"
 132     },
 133 #ifdef HAVE_DOOR_CREATE
 134     {
 135         "door-path",            's', arg_string, &door_path,
 136         "path to kcm door", "path"
 137     },
 138 #endif
 139     {
 140         "server",               'S', arg_string, &system_server,
 141         "server to get system ticket for", "principal"
 142     },
 143     {
 144         "keytab",       't',    arg_string,     &system_keytab,
 145         "system keytab name",   "keytab"
 146     },
 147     {
 148         "user",         'u',    arg_string,     &system_user,
 149         "system cache owner",   "user"
 150     },
 151     {   "version",      'v',    arg_flag,   &version_flag }
 152 };
 153
 154 static int num_args = sizeof(args) / sizeof(args[0]);
 155
 156 static void
 157 usage(int ret)
 158 {
 159     arg_printusage (args, num_args, NULL, "");
 160     exit (ret);
 161 }
 162
 163 static int parse_owners(kcm_ccache ccache)
 164 {
 165     uid_t uid = 0;
 166     gid_t gid = 0;
 167     struct passwd *pw;
 168     struct group *gr;
 169     int uid_p = 0;
 170     int gid_p = 0;
 171
 172     if (system_user != NULL) {
 173         if (isdigit((unsigned char)system_user[0])) {
 174             pw = getpwuid(atoi(system_user));
 175         } else {
 176             pw = getpwnam(system_user);
 177         }
 178         if (pw == NULL) {
 179             return errno;
 180         }
 181
 182         system_user = strdup(pw->pw_name);
 183         if (system_user == NULL) {
 184             return ENOMEM;
 185         }
 186
 187         uid = pw->pw_uid; uid_p = 1;
 188         gid = pw->pw_gid; gid_p = 1;
 189     }
 190
 191     if (system_group != NULL) {
 192         if (isdigit((unsigned char)system_group[0])) {
 193             gr = getgrgid(atoi(system_group));
 194         } else {
 195             gr = getgrnam(system_group);
 196         }
 197         if (gr == NULL) {
 198             return errno;
 199         }
 200
 201         gid = gr->gr_gid; gid_p = 1;
 202     }
 203
 204     if (uid_p)
 205         ccache->uid = uid;
 206     else
 207         ccache->uid = 0; /* geteuid() XXX */
 208
 209     if (gid_p)
 210         ccache->gid = gid;
 211     else
 212         ccache->gid = 0; /* getegid() XXX */
 213
 214     return 0;
 215 }
 216
 217 static const char *
 218 kcm_system_config_get_string(const char *string)
 219 {
 220     return krb5_config_get_string(kcm_context, NULL, "kcm",
 221                                   "system_ccache", string, NULL);
 222 }
 223
 224 static krb5_error_code
 225 ccache_init_system(void)
 226 {
 227     kcm_ccache ccache;
 228     krb5_error_code ret;
 229
 230     if (system_cache_name == NULL)
 231         system_cache_name = kcm_system_config_get_string("cc_name");
 232
 233     ret = kcm_ccache_new(kcm_context,
 234                          system_cache_name ? system_cache_name : "SYSTEM",
 235                          &ccache);
 236     if (ret)
 237         return ret;
 238
 239     ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
 240     ccache->flags |= KCM_FLAGS_USE_KEYTAB;
 241
 242     ret = parse_owners(ccache);
 243     if (ret)
 244         return ret;
 245
 246     ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
 247     if (ret) {
 248         kcm_release_ccache(kcm_context, ccache);
 249         return ret;
 250     }
 251
 252     if (system_server == NULL)
 253         system_server = kcm_system_config_get_string("server");
 254
 255     if (system_server != NULL) {
 256         ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
 257         if (ret) {
 258             kcm_release_ccache(kcm_context, ccache);
 259             return ret;
 260         }
 261     }
 262
 263     if (system_keytab == NULL)
 264         system_keytab = kcm_system_config_get_string("keytab_name");
 265
 266     if (system_keytab != NULL) {
 267         ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
 268     } else {
 269         ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
 270     }
 271     if (ret) {
 272         kcm_release_ccache(kcm_context, ccache);
 273         return ret;
 274     }
 275
 276     if (renew_life == NULL)
 277         renew_life = kcm_system_config_get_string("renew_life");
 278
 279     if (renew_life == NULL)
 280         renew_life = "1 month";
 281
 282     if (renew_life != NULL) {
 283         ccache->renew_life = parse_time(renew_life, "s");
 284         if (ccache->renew_life < 0) {
 285             kcm_release_ccache(kcm_context, ccache);
 286             return EINVAL;
 287         }
 288     }
 289
 290     if (ticket_life == NULL)
 291         ticket_life = kcm_system_config_get_string("ticket_life");
 292
 293     if (ticket_life != NULL) {
 294         ccache->tkt_life = parse_time(ticket_life, "s");
 295         if (ccache->tkt_life < 0) {
 296             kcm_release_ccache(kcm_context, ccache);
 297             return EINVAL;
 298         }
 299     }
 300
 301     if (system_perms == NULL)
 302         system_perms = kcm_system_config_get_string("mode");
 303
 304     if (system_perms != NULL) {
 305         int mode;
 306
 307         if (sscanf(system_perms, "%o", &mode) != 1)
 308             return EINVAL;
 309
 310         ccache->mode = mode;
 311     }
 312
 313     if (disallow_getting_krbtgt == -1) {
 314         disallow_getting_krbtgt =
 315             krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
 316                                          "disallow-getting-krbtgt", NULL);
 317     }
 318
 319     /* enqueue default actions for credentials cache */
 320     ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
 321
 322     kcm_release_ccache(kcm_context, ccache); /* retained by event queue */
 323
 324     return ret;
 325 }
 326
 327 void
 328 kcm_configure(int argc, char **argv)
 329 {
 330     krb5_error_code ret;
 331     int optind = 0;
 332     const char *p;
 333
 334     while(getarg(args, num_args, argc, argv, &optind))
 335         warnx("error at argument `%s'", argv[optind]);
 336
 337     if(help_flag)
 338         usage (0);
 339
 340     if (version_flag) {
 341         print_version(NULL);
 342         exit(0);
 343     }
 344
 345     argc -= optind;
 346     argv += optind;
 347
 348     if (argc != 0)
 349         usage(1);
 350
 351     {
 352         char **files;
 353
 354         if(config_file == NULL)
 355             config_file = _PATH_KCM_CONF;
 356
 357         ret = krb5_prepend_config_files_default(config_file, &files);
 358         if (ret)
 359             krb5_err(kcm_context, 1, ret, "getting configuration files");
 360
 361         ret = krb5_set_config_files(kcm_context, files);
 362         krb5_free_config_files(files);
 363         if(ret)
 364             krb5_err(kcm_context, 1, ret, "reading configuration files");
 365     }
 366
 367     if(max_request_str)
 368         max_request = parse_bytes(max_request_str, NULL);
 369
 370     if(max_request == 0){
 371         p = krb5_config_get_string (kcm_context,
 372                                     NULL,
 373                                     "kcm",
 374                                     "max-request",
 375                                     NULL);
 376         if(p)
 377             max_request = parse_bytes(p, NULL);
 378     }
 379
 380     if (system_principal == NULL) {
 381         system_principal = kcm_system_config_get_string("principal");
 382     }
 383
 384     if (system_principal != NULL) {
 385         ret = ccache_init_system();
 386         if (ret)
 387             krb5_err(kcm_context, 1, ret, "initializing system ccache");
 388     }
 389
 390 #ifdef SUPPORT_DETACH
 391     if(detach_from_console == -1)
 392         detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
 393                                                            DETACH_IS_DEFAULT,
 394                                                            "kcm",
 395                                                            "detach", NULL);
 396 #endif
 397     kcm_openlog();
 398     if(max_request == 0)
 399         max_request = 64 * 1024;
 400 }
 401