crypto/dist/heimdal/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("$Heimdal: config.c 15296 2005-05-30 10:17:43Z lha $"
  38         "$NetBSD$");
  39
  40 static const char *config_file; /* location of kcm config file */
  41
  42 size_t max_request = 0;         /* maximal size of a request */
  43 char *socket_path = NULL;
  44 char *door_path = NULL;
  45
  46 static char *max_request_str;   /* `max_request' as a string */
  47
  48 int detach_from_console = -1;
  49 #define DETACH_IS_DEFAULT FALSE
  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 disallow_getting_krbtgt = -1;
  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 #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     {   "help",         'h',    arg_flag,   &help_flag },
  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"
 112     },
 113     {
 114         "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
 115         "disable fetching krbtgt from the cache"
 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 #ifdef HAVE_DOOR_CREATE
 126     {
 127         "door-path",            's', arg_string, &door_path,
 128         "path to kcm door", "path"
 129     },
 130 #endif
 131     {
 132         "server",               'S', arg_string, &system_server,
 133         "server to get system ticket for", "principal"
 134     },
 135     {
 136         "keytab",       't',    arg_string,     &system_keytab,
 137         "system keytab name",   "keytab"
 138     },
 139     {
 140         "user",         'u',    arg_string,     &system_user,
 141         "system cache owner",   "user"
 142     },
 143     {   "version",      'v',    arg_flag,   &version_flag }
 144 };
 145
 146 static int num_args = sizeof(args) / sizeof(args[0]);
 147
 148 static void
 149 usage(int ret)
 150 {
 151     arg_printusage (args, num_args, NULL, "");
 152     exit (ret);
 153 }
 154
 155 static int parse_owners(kcm_ccache ccache)
 156 {
 157     uid_t uid = 0;
 158     gid_t gid = 0;
 159     struct passwd *pw;
 160     struct group *gr;
 161     int uid_p = 0;
 162     int gid_p = 0;
 163
 164     if (system_user != NULL) {
 165         if (isdigit((unsigned char)system_user[0])) {
 166             pw = getpwuid(atoi(system_user));
 167         } else {
 168             pw = getpwnam(system_user);
 169         }
 170         if (pw == NULL) {
 171             return errno;
 172         }
 173
 174         system_user = strdup(pw->pw_name);
 175         if (system_user == NULL) {
 176             return ENOMEM;
 177         }
 178
 179         uid = pw->pw_uid; uid_p = 1;
 180         gid = pw->pw_gid; gid_p = 1;
 181     }
 182
 183     if (system_group != NULL) {
 184         if (isdigit((unsigned char)system_group[0])) {
 185             gr = getgrgid(atoi(system_group));
 186         } else {
 187             gr = getgrnam(system_group);
 188         }
 189         if (gr == NULL) {
 190             return errno;
 191         }
 192
 193         gid = gr->gr_gid; gid_p = 1;
 194     }
 195
 196     if (uid_p)
 197         ccache->uid = uid;
 198     else
 199         ccache->uid = 0; /* geteuid() XXX */
 200
 201     if (gid_p)
 202         ccache->gid = gid;
 203     else
 204         ccache->gid = 0; /* getegid() XXX */
 205
 206     return 0;
 207 }
 208
 209 static const char *
 210 kcm_system_config_get_string(const char *string)
 211 {
 212     return krb5_config_get_string(kcm_context, NULL, "kcm",
 213                                   "system_ccache", string, NULL);
 214 }
 215
 216 static krb5_error_code
 217 ccache_init_system(void)
 218 {
 219     kcm_ccache ccache;
 220     krb5_error_code ret;
 221
 222     if (system_cache_name == NULL)
 223         system_cache_name = kcm_system_config_get_string("cc_name");
 224
 225     ret = kcm_ccache_new(kcm_context,
 226                          system_cache_name ? system_cache_name : "SYSTEM",
 227                          &ccache);
 228     if (ret)
 229         return ret;
 230
 231     ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
 232     ccache->flags |= KCM_FLAGS_USE_KEYTAB;
 233
 234     ret = parse_owners(ccache);
 235     if (ret)
 236         return ret;
 237
 238     ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
 239     if (ret) {
 240         kcm_release_ccache(kcm_context, &ccache);
 241         return ret;
 242     }
 243
 244     if (system_server == NULL)
 245         system_server = kcm_system_config_get_string("server");
 246
 247     if (system_server != NULL) {
 248         ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
 249         if (ret) {
 250             kcm_release_ccache(kcm_context, &ccache);
 251             return ret;
 252         }
 253     }
 254
 255     if (system_keytab == NULL)
 256         system_keytab = kcm_system_config_get_string("keytab_name");
 257
 258     if (system_keytab != NULL) {
 259         ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
 260     } else {
 261         ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
 262     }
 263     if (ret) {
 264         kcm_release_ccache(kcm_context, &ccache);
 265         return ret;
 266     }
 267
 268     if (renew_life == NULL)
 269         renew_life = kcm_system_config_get_string("renew_life");
 270
 271     if (renew_life == NULL)
 272         renew_life = "1 month";
 273
 274     if (renew_life != NULL) {
 275         ccache->renew_life = parse_time(renew_life, "s");
 276         if (ccache->renew_life < 0) {
 277             kcm_release_ccache(kcm_context, &ccache);
 278             return EINVAL;
 279         }
 280     }
 281
 282     if (ticket_life == NULL)
 283         ticket_life = kcm_system_config_get_string("ticket_life");
 284
 285     if (ticket_life != NULL) {
 286         ccache->tkt_life = parse_time(ticket_life, "s");
 287         if (ccache->tkt_life < 0) {
 288             kcm_release_ccache(kcm_context, &ccache);
 289             return EINVAL;
 290         }
 291     }
 292
 293     if (system_perms == NULL)
 294         system_perms = kcm_system_config_get_string("mode");
 295
 296     if (system_perms != NULL) {
 297         int mode;
 298
 299         if (sscanf(system_perms, "%o", &mode) != 1)
 300             return EINVAL;
 301
 302         ccache->mode = mode;
 303     }
 304
 305     if (disallow_getting_krbtgt == -1) {
 306         disallow_getting_krbtgt =
 307             krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
 308                                          "disallow-getting-krbtgt", NULL);
 309     }
 310
 311     /* enqueue default actions for credentials cache */
 312     ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
 313
 314     kcm_release_ccache(kcm_context, &ccache); /* retained by event queue */
 315
 316     return ret;
 317 }
 318
 319 void
 320 kcm_configure(int argc, char **argv)
 321 {
 322     krb5_error_code ret;
 323     int optind = 0;
 324     const char *p;
 325
 326     while(getarg(args, num_args, argc, argv, &optind))
 327         warnx("error at argument `%s'", argv[optind]);
 328
 329     if(help_flag)
 330         usage (0);
 331
 332     if (version_flag) {
 333         print_version(NULL);
 334         exit(0);
 335     }
 336
 337     argc -= optind;
 338     argv += optind;
 339
 340     if (argc != 0)
 341         usage(1);
 342
 343     {
 344         char **files;
 345
 346         if(config_file == NULL)
 347             config_file = _PATH_KCM_CONF;
 348
 349         ret = krb5_prepend_config_files_default(config_file, &files);
 350         if (ret)
 351             krb5_err(kcm_context, 1, ret, "getting configuration files");
 352
 353         ret = krb5_set_config_files(kcm_context, files);
 354         krb5_free_config_files(files);
 355         if(ret)
 356             krb5_err(kcm_context, 1, ret, "reading configuration files");
 357     }
 358
 359     if(max_request_str)
 360         max_request = parse_bytes(max_request_str, NULL);
 361
 362     if(max_request == 0){
 363         p = krb5_config_get_string (kcm_context,
 364                                     NULL,
 365                                     "kcm",
 366                                     "max-request",
 367                                     NULL);
 368         if(p)
 369             max_request = parse_bytes(p, NULL);
 370     }
 371
 372     if (system_principal == NULL) {
 373         system_principal = kcm_system_config_get_string("principal");
 374     }
 375
 376     if (system_principal != NULL) {
 377         ret = ccache_init_system();
 378         if (ret)
 379             krb5_err(kcm_context, 1, ret, "initializing system ccache");
 380     }
 381
 382     if(detach_from_console == -1)
 383         detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
 384                                                            DETACH_IS_DEFAULT,
 385                                                            "kcm",
 386                                                            "detach", NULL);
 387     kcm_openlog();
 388     if(max_request == 0)
 389         max_request = 64 * 1024;
 390 }
 391