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
  49 static const char *system_cache_name = NULL;
  50 static const char *system_keytab = NULL;
  51 static const char *system_principal = NULL;
  52 static const char *system_server = NULL;
  53 static const char *system_perms = NULL;
  54 static const char *system_user = NULL;
  55 static const char *system_group = NULL;
  56
  57 static const char *renew_life = NULL;
  58 static const char *ticket_life = NULL;
  59
  60 int launchd_flag = 0;
  61 int disallow_getting_krbtgt = 0;
  62 int name_constraints = -1;
  63
  64 static int help_flag;
  65 static int version_flag;
  66
  67 static struct getargs args[] = {
  68     {
  69         "cache-name",   0,      arg_string,     &system_cache_name,
  70         "system cache name", "cachename"
  71     },
  72     {
  73         "config-file",  'c',    arg_string,     &config_file,
  74         "location of config file",      "file"
  75     },
  76     {
  77         "group",        'g',    arg_string,     &system_group,
  78         "system cache group",   "group"
  79     },
  80     {
  81         "max-request",  0,      arg_string, &max_request,
  82         "max size for a kcm-request", "size"
  83     },
  84     {
  85         "launchd",      0,      arg_flag, &launchd_flag,
  86         "when in use by launchd", NULL
  87     },
  88     {
  89         "detach",       0 ,      arg_flag, &detach_from_console,
  90         "detach from console", NULL
  91     },
  92     {
  93         "daemon-child",       0 ,      arg_integer, &daemon_child,
  94         "private argument, do not use", NULL
  95     },
  96     {   "help",         'h',    arg_flag,   &help_flag, NULL, NULL },
  97     {
  98         "system-principal",     'k',    arg_string,     &system_principal,
  99         "system principal name",        "principal"
 100     },
 101     {
 102         "lifetime",     'l', arg_string, &ticket_life,
 103         "lifetime of system tickets", "time"
 104     },
 105     {
 106         "mode",         'm', arg_string, &system_perms,
 107         "octal mode of system cache", "mode"
 108     },
 109     {
 110         "name-constraints",     'n', arg_negative_flag, &name_constraints,
 111         "disable credentials cache name constraints", NULL
 112     },
 113     {
 114         "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
 115         "disable fetching krbtgt from the cache", NULL
 116     },
 117     {
 118         "renewable-life",       'r', arg_string, &renew_life,
 119         "renewable lifetime of system tickets", "time"
 120     },
 121     {
 122         "max-request",  'r', arg_integer, &max_request_str,
 123         "max request size", "bytes"
 124     },
 125     {
 126         "socket-path",          's', arg_string, &socket_path,
 127         "path to kcm domain socket", "path"
 128     },
 129     {
 130         "server",               'S', arg_string, &system_server,
 131         "server to get system ticket for", "principal"
 132     },
 133     {
 134         "keytab",       't',    arg_string,     &system_keytab,
 135         "system keytab name",   "keytab"
 136     },
 137     {
 138         "user",         'u',    arg_string,     &system_user,
 139         "system cache owner",   "user"
 140     },
 141     {   "version",      'v',    arg_flag,   &version_flag, NULL, NULL }
 142 };
 143
 144 static int num_args = sizeof(args) / sizeof(args[0]);
 145
 146 static void
 147 usage(int ret)
 148 {
 149     arg_printusage (args, num_args, NULL, "");
 150     exit (ret);
 151 }
 152
 153 static int parse_owners(kcm_ccache ccache)
 154 {
 155     uid_t uid = 0;
 156     gid_t gid = 0;
 157     struct passwd *pw;
 158     struct group *gr;
 159     int uid_p = 0;
 160     int gid_p = 0;
 161
 162     if (system_user != NULL) {
 163         if (isdigit((unsigned char)system_user[0])) {
 164             pw = getpwuid(atoi(system_user));
 165         } else {
 166             pw = getpwnam(system_user);
 167         }
 168         if (pw == NULL) {
 169             return errno;
 170         }
 171
 172         system_user = strdup(pw->pw_name);
 173         if (system_user == NULL) {
 174             return ENOMEM;
 175         }
 176
 177         uid = pw->pw_uid; uid_p = 1;
 178         gid = pw->pw_gid; gid_p = 1;
 179     }
 180
 181     if (system_group != NULL) {
 182         if (isdigit((unsigned char)system_group[0])) {
 183             gr = getgrgid(atoi(system_group));
 184         } else {
 185             gr = getgrnam(system_group);
 186         }
 187         if (gr == NULL) {
 188             return errno;
 189         }
 190
 191         gid = gr->gr_gid; gid_p = 1;
 192     }
 193
 194     if (uid_p)
 195         ccache->uid = uid;
 196     else
 197         ccache->uid = 0; /* geteuid() XXX */
 198
 199     if (gid_p)
 200         ccache->gid = gid;
 201     else
 202         ccache->gid = 0; /* getegid() XXX */
 203
 204     return 0;
 205 }
 206
 207 static const char *
 208 kcm_system_config_get_string(const char *string)
 209 {
 210     return krb5_config_get_string(kcm_context, NULL, "kcm",
 211                                   "system_ccache", string, NULL);
 212 }
 213
 214 static krb5_error_code
 215 ccache_init_system(void)
 216 {
 217     kcm_ccache ccache;
 218     krb5_error_code ret;
 219
 220     if (system_cache_name == NULL)
 221         system_cache_name = kcm_system_config_get_string("cc_name");
 222
 223     ret = kcm_ccache_new(kcm_context,
 224                          system_cache_name ? system_cache_name : "SYSTEM",
 225                          &ccache);
 226     if (ret)
 227         return ret;
 228
 229     ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
 230     ccache->flags |= KCM_FLAGS_USE_KEYTAB;
 231
 232     ret = parse_owners(ccache);
 233     if (ret)
 234         return ret;
 235
 236     ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
 237     if (ret) {
 238         kcm_release_ccache(kcm_context, ccache);
 239         return ret;
 240     }
 241
 242     if (system_server == NULL)
 243         system_server = kcm_system_config_get_string("server");
 244
 245     if (system_server != NULL) {
 246         ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
 247         if (ret) {
 248             kcm_release_ccache(kcm_context, ccache);
 249             return ret;
 250         }
 251     }
 252
 253     if (system_keytab == NULL)
 254         system_keytab = kcm_system_config_get_string("keytab_name");
 255
 256     if (system_keytab != NULL) {
 257         ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
 258     } else {
 259         ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
 260     }
 261     if (ret) {
 262         kcm_release_ccache(kcm_context, ccache);
 263         return ret;
 264     }
 265
 266     if (renew_life == NULL)
 267         renew_life = kcm_system_config_get_string("renew_life");
 268
 269     if (renew_life == NULL)
 270         renew_life = "6 months";
 271
 272     if (renew_life != NULL) {
 273         ccache->renew_life = parse_time(renew_life, "s");
 274         if (ccache->renew_life < 0) {
 275             kcm_release_ccache(kcm_context, ccache);
 276             return EINVAL;
 277         }
 278     }
 279
 280     if (ticket_life == NULL)
 281         ticket_life = kcm_system_config_get_string("ticket_life");
 282
 283     if (ticket_life != NULL) {
 284         ccache->tkt_life = parse_time(ticket_life, "s");
 285         if (ccache->tkt_life < 0) {
 286             kcm_release_ccache(kcm_context, ccache);
 287             return EINVAL;
 288         }
 289     }
 290
 291     if (system_perms == NULL)
 292         system_perms = kcm_system_config_get_string("mode");
 293
 294     if (system_perms != NULL) {
 295         int mode;
 296
 297         if (sscanf(system_perms, "%o", &mode) != 1)
 298             return EINVAL;
 299
 300         ccache->mode = mode;
 301     }
 302
 303     if (disallow_getting_krbtgt == -1) {
 304         disallow_getting_krbtgt =
 305             krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
 306                                          "disallow-getting-krbtgt", NULL);
 307     }
 308
 309     /* enqueue default actions for credentials cache */
 310     ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
 311
 312     kcm_release_ccache(kcm_context, ccache); /* retained by event queue */
 313
 314     return ret;
 315 }
 316
 317 void
 318 kcm_configure(int argc, char **argv)
 319 {
 320     krb5_error_code ret;
 321     int optidx = 0;
 322     const char *p;
 323
 324     while (getarg(args, num_args, argc, argv, &optidx))
 325         warnx("error at argument `%s'", argv[optidx]);
 326
 327     if (help_flag)
 328         usage (0);
 329
 330     if (version_flag) {
 331         print_version(NULL);
 332         exit(0);
 333     }
 334
 335     argc -= optidx;
 336     argv += optidx;
 337
 338     if (argc != 0)
 339         usage(1);
 340
 341     {
 342         char **files;
 343
 344         if(config_file == NULL)
 345             config_file = _PATH_KCM_CONF;
 346
 347         ret = krb5_prepend_config_files_default(config_file, &files);
 348         if (ret)
 349             krb5_err(kcm_context, 1, ret, "getting configuration files");
 350
 351         ret = krb5_set_config_files(kcm_context, files);
 352         krb5_free_config_files(files);
 353         if(ret)
 354             krb5_err(kcm_context, 1, ret, "reading configuration files");
 355     }
 356
 357     if (max_request_str) {
 358         ssize_t bytes;
 359
 360         if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 361             krb5_errx(kcm_context, 1,
 362                       "--max-request size must be non-negative");
 363
 364         max_request = bytes;
 365     }
 366
 367     if(max_request == 0){
 368         p = krb5_config_get_string (kcm_context,
 369                                     NULL,
 370                                     "kcm",
 371                                     "max-request",
 372                                     NULL);
 373         if (p) {
 374             ssize_t bytes;
 375
 376             if ((bytes = parse_bytes(max_request_str, NULL)) < 0)
 377                 krb5_errx(kcm_context, 1,
 378                           "[kcm] max-request size must be non-negative");
 379             max_request = bytes;
 380         }
 381     }
 382
 383     if (system_principal == NULL) {
 384         system_principal = kcm_system_config_get_string("principal");
 385     }
 386
 387     if (system_principal != NULL) {
 388         ret = ccache_init_system();
 389         if (ret)
 390             krb5_err(kcm_context, 1, ret, "initializing system ccache");
 391     }
 392
 393     if(detach_from_console == -1)
 394         detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
 395                                                            FALSE,
 396                                                            "kcm",
 397                                                            "detach", NULL);
 398     kcm_openlog();
 399     if(max_request == 0)
 400         max_request = 64 * 1024;
 401 }
 402