kcm/config.c

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