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
  44 static char *max_request_str;   /* `max_request' as a string */
  45
  46 int detach_from_console = -1;
  47 int daemon_child = -1;
  48 int automatic_renewal = -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     {
  98         "automatic-renewal",    0 , arg_negative_flag, &automatic_renewal,
  99         "disable automatic TGT renewal", NULL
 100     },
 101     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
 102     {
 103         "system-principal",     'k',    arg_string,     &system_principal,
 104         "system principal name",        "principal"
 105     },
 106     {
 107         "lifetime",     'l', arg_string, &ticket_life,
 108         "lifetime of system tickets", "time"
 109     },
 110     {
 111         "mode",         'm', arg_string, &system_perms,
 112         "octal mode of system cache", "mode"
 113     },
 114     {
 115         "name-constraints",     'n', arg_negative_flag, &name_constraints,
 116         "disable credentials cache name constraints", NULL
 117     },
 118     {
 119         "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
 120         "disable fetching krbtgt from the cache", NULL
 121     },
 122     {
 123         "renewable-life",       'r', arg_string, &renew_life,
 124         "renewable lifetime of system tickets", "time"
 125     },
 126     {
 127         "max-request",  'r', arg_integer, &max_request_str,
 128         "max request size", "bytes"
 129     },
 130     {
 131         "socket-path",          's', arg_string, &socket_path,
 132         "path to kcm domain socket", "path"
 133     },
 134     {
 135         "server",               'S', arg_string, &system_server,
 136         "server to get system ticket for", "principal"
 137     },
 138     {
 139         "keytab",       't',    arg_string,     &system_keytab,
 140         "system keytab name",   "keytab"
 141     },
 142     {
 143         "user",         'u',    arg_string,     &system_user,
 144         "system cache owner",   "user"
 145     },
 146     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 147 };
 148
 149 static int num_args = sizeof(args) / sizeof(args[0]);
 150
 151 static void
 152 usage(int ret)
 153 {
 154     arg_printusage (args, num_args, NULL, "");
 155     exit (ret);
 156 }
 157
 158 static int parse_owners(kcm_ccache ccache)
 159 {
 160     uid_t uid = 0;
 161     gid_t gid = 0;
 162     struct passwd *pw;
 163     struct group *gr;
 164     int uid_p = 0;
 165     int gid_p = 0;
 166
 167     if (system_user != NULL) {
 168         if (isdigit((unsigned char)system_user[0])) {
 169             pw = getpwuid(atoi(system_user));
 170         } else {
 171             pw = getpwnam(system_user);
 172         }
 173         if (pw == NULL) {
 174             return errno;
 175         }
 176
 177         system_user = strdup(pw->pw_name);
 178         if (system_user == NULL) {
 179             return ENOMEM;
 180         }
 181
 182         uid = pw->pw_uid; uid_p = 1;
 183         gid = pw->pw_gid; gid_p = 1;
 184     }
 185
 186     if (system_group != NULL) {
 187         if (isdigit((unsigned char)system_group[0])) {
 188             gr = getgrgid(atoi(system_group));
 189         } else {
 190             gr = getgrnam(system_group);
 191         }
 192         if (gr == NULL) {
 193             return errno;
 194         }
 195
 196         gid = gr->gr_gid; gid_p = 1;
 197     }
 198
 199     if (uid_p)
 200         ccache->uid = uid;
 201     else
 202         ccache->uid = 0; /* geteuid() XXX */
 203
 204     if (gid_p)
 205         ccache->gid = gid;
 206     else
 207         ccache->gid = 0; /* getegid() XXX */
 208
 209     return 0;
 210 }
 211
 212 static const char *
 213 kcm_system_config_get_string(const char *string)
 214 {
 215     return krb5_config_get_string(kcm_context, NULL, "kcm",
 216                                   "system_ccache", string, NULL);
 217 }
 218
 219 static krb5_error_code
 220 ccache_init_system(void)
 221 {
 222     kcm_ccache ccache;
 223     krb5_error_code ret;
 224
 225     if (system_cache_name == NULL)
 226         system_cache_name = kcm_system_config_get_string("cc_name");
 227
 228     ret = kcm_ccache_new(kcm_context,
 229                          system_cache_name ? system_cache_name : "SYSTEM",
 230                          &ccache);
 231     if (ret)
 232         return ret;
 233
 234     ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
 235     ccache->flags |= KCM_FLAGS_USE_KEYTAB;
 236
 237     ret = parse_owners(ccache);
 238     if (ret)
 239         return ret;
 240
 241     ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
 242     if (ret) {
 243         kcm_release_ccache(kcm_context, ccache);
 244         return ret;
 245     }
 246
 247     if (system_server == NULL)
 248         system_server = kcm_system_config_get_string("server");
 249
 250     if (system_server != NULL) {
 251         ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
 252         if (ret) {
 253             kcm_release_ccache(kcm_context, ccache);
 254             return ret;
 255         }
 256     }
 257
 258     if (system_keytab == NULL)
 259         system_keytab = kcm_system_config_get_string("keytab_name");
 260
 261     if (system_keytab != NULL) {
 262         ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
 263     } else {
 264         ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
 265     }
 266     if (ret) {
 267         kcm_release_ccache(kcm_context, ccache);
 268         return ret;
 269     }
 270
 271     if (renew_life == NULL)
 272         renew_life = kcm_system_config_get_string("renew_life");
 273
 274     if (renew_life == NULL)
 275         renew_life = "6 months";
 276
 277     if (renew_life != NULL) {
 278         ccache->renew_life = parse_time(renew_life, "s");
 279         if (ccache->renew_life < 0) {
 280             kcm_release_ccache(kcm_context, ccache);
 281             return EINVAL;
 282         }
 283     }
 284
 285     if (ticket_life == NULL)
 286         ticket_life = kcm_system_config_get_string("ticket_life");
 287
 288     if (ticket_life != NULL) {
 289         ccache->tkt_life = parse_time(ticket_life, "s");
 290         if (ccache->tkt_life < 0) {
 291             kcm_release_ccache(kcm_context, ccache);
 292             return EINVAL;
 293         }
 294     }
 295
 296     if (system_perms == NULL)
 297         system_perms = kcm_system_config_get_string("mode");
 298
 299     if (system_perms != NULL) {
 300         int mode;
 301
 302         if (sscanf(system_perms, "%o", &mode) != 1)
 303             return EINVAL;
 304
 305         ccache->mode = mode;
 306     }
 307
 308     if (disallow_getting_krbtgt == -1) {
 309         disallow_getting_krbtgt =
 310             krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
 311                                          "disallow-getting-krbtgt", NULL);
 312     }
 313
 314     /* enqueue default actions for credentials cache */
 315     ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
 316
 317     kcm_release_ccache(kcm_context, ccache); /* retained by event queue */
 318
 319     return ret;
 320 }
 321
 322 void
 323 kcm_configure(int argc, char **argv)
 324 {
 325     krb5_error_code ret;
 326     int optidx = 0;
 327     const char *p;
 328
 329     while (getarg(args, num_args, argc, argv, &optidx))
 330         warnx("error at argument `%s'", argv[optidx]);
 331
 332     if (help_flag)
 333         usage (0);
 334
 335     if (version_flag) {
 336         print_version(NULL);
 337         exit(0);
 338     }
 339
 340     argc -= optidx;
 341     argv += optidx;
 342
 343     if (argc != 0)
 344         usage(1);
 345
 346     {
 347         char **files;
 348
 349         if(config_file == NULL)
 350             config_file = _PATH_KCM_CONF;
 351
 352         ret = krb5_prepend_config_files_default(config_file, &files);
 353         if (ret)
 354             krb5_err(kcm_context, 1, ret, "getting configuration files");
 355
 356         ret = krb5_set_config_files(kcm_context, files);
 357         krb5_free_config_files(files);
 358         if(ret)
 359             krb5_err(kcm_context, 1, ret, "reading configuration files");
 360     }
 361
 362     if (max_request_str) {
 363         ssize_t bytes;
 364
 365         if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 366             krb5_errx(kcm_context, 1,
 367                       "--max-request size must be non-negative");
 368
 369         max_request = bytes;
 370     }
 371
 372     if(max_request == 0){
 373         p = krb5_config_get_string (kcm_context,
 374                                     NULL,
 375                                     "kcm",
 376                                     "max-request",
 377                                     NULL);
 378         if (p) {
 379             ssize_t bytes;
 380
 381             if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 382                 krb5_errx(kcm_context, 1,
 383                           "[kcm] max-request size must be non-negative");
 384             max_request = bytes;
 385         }
 386     }
 387
 388     if (system_principal == NULL) {
 389         system_principal = kcm_system_config_get_string("principal");
 390     }
 391
 392     if (system_principal != NULL) {
 393         ret = ccache_init_system();
 394         if (ret)
 395             krb5_err(kcm_context, 1, ret, "initializing system ccache");
 396     }
 397
 398     if(automatic_renewal == -1)
 399         automatic_renewal = krb5_config_get_bool_default(kcm_context, NULL,
 400                                                          TRUE,
 401                                                          "kcm",
 402                                                          "automatic_renewal",
 403                                                          NULL);
 404
 405     if(detach_from_console == -1)
 406         detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
 407                                                            FALSE,
 408                                                            "kcm",
 409                                                            "detach", NULL);
 410     kcm_openlog();
 411     if(max_request == 0)
 412         max_request = 64 * 1024;
 413 }
 414