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