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 char *door_path = NULL;
  44
  45 static char *max_request_str;   /* `max_request' as a string */
  46
  47 int detach_from_console = -1;
  48 #define DETACH_IS_DEFAULT FALSE
  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 disallow_getting_krbtgt = -1;
  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 #if DETACH_IS_DEFAULT
  85     {
  86         "detach",       'D',      arg_negative_flag, &detach_from_console,
  87         "don't detach from console"
  88     },
  89 #else
  90     {
  91         "detach",       0 ,      arg_flag, &detach_from_console,
  92         "detach from console"
  93     },
  94 #endif
  95     {   "help",         'h',    arg_flag,   &help_flag },
  96     {
  97         "system-principal",     'k',    arg_string,     &system_principal,
  98         "system principal name",        "principal"
  99     },
 100     {
 101         "lifetime",     'l', arg_string, &ticket_life,
 102         "lifetime of system tickets", "time"
 103     },
 104     {
 105         "mode",         'm', arg_string, &system_perms,
 106         "octal mode of system cache", "mode"
 107     },
 108     {
 109         "name-constraints",     'n', arg_negative_flag, &name_constraints,
 110         "disable credentials cache name constraints"
 111     },
 112     {
 113         "disallow-getting-krbtgt", 0, arg_flag, &disallow_getting_krbtgt,
 114         "disable fetching krbtgt from the cache"
 115     },
 116     {
 117         "renewable-life",       'r', arg_string, &renew_life,
 118         "renewable lifetime of system tickets", "time"
 119     },
 120     {
 121         "socket-path",          's', arg_string, &socket_path,
 122         "path to kcm domain socket", "path"
 123     },
 124 #ifdef HAVE_DOOR_CREATE
 125     {
 126         "door-path",            's', arg_string, &door_path,
 127         "path to kcm door", "path"
 128     },
 129 #endif
 130     {
 131         "server",               'S', arg_string, &system_server,
 132         "server to get system ticket for", "principal"
 133     },
 134     {
 135         "keytab",       't',    arg_string,     &system_keytab,
 136         "system keytab name",   "keytab"
 137     },
 138     {
 139         "user",         'u',    arg_string,     &system_user,
 140         "system cache owner",   "user"
 141     },
 142     {   "version",      'v',    arg_flag,   &version_flag }
 143 };
 144
 145 static int num_args = sizeof(args) / sizeof(args[0]);
 146
 147 static void
 148 usage(int ret)
 149 {
 150     arg_printusage (args, num_args, NULL, "");
 151     exit (ret);
 152 }
 153
 154 static int parse_owners(kcm_ccache ccache)
 155 {
 156     uid_t uid = 0;
 157     gid_t gid = 0;
 158     struct passwd *pw;
 159     struct group *gr;
 160     int uid_p = 0;
 161     int gid_p = 0;
 162
 163     if (system_user != NULL) {
 164         if (isdigit((unsigned char)system_user[0])) {
 165             pw = getpwuid(atoi(system_user));
 166         } else {
 167             pw = getpwnam(system_user);
 168         }
 169         if (pw == NULL) {
 170             return errno;
 171         }
 172
 173         system_user = strdup(pw->pw_name);
 174         if (system_user == NULL) {
 175             return ENOMEM;
 176         }
 177
 178         uid = pw->pw_uid; uid_p = 1;
 179         gid = pw->pw_gid; gid_p = 1;
 180     }
 181
 182     if (system_group != NULL) {
 183         if (isdigit((unsigned char)system_group[0])) {
 184             gr = getgrgid(atoi(system_group));
 185         } else {
 186             gr = getgrnam(system_group);
 187         }
 188         if (gr == NULL) {
 189             return errno;
 190         }
 191
 192         gid = gr->gr_gid; gid_p = 1;
 193     }
 194
 195     if (uid_p)
 196         ccache->uid = uid;
 197     else
 198         ccache->uid = 0; /* geteuid() XXX */
 199
 200     if (gid_p)
 201         ccache->gid = gid;
 202     else
 203         ccache->gid = 0; /* getegid() XXX */
 204
 205     return 0;
 206 }
 207
 208 static const char *
 209 kcm_system_config_get_string(const char *string)
 210 {
 211     return krb5_config_get_string(kcm_context, NULL, "kcm",
 212                                   "system_ccache", string, NULL);
 213 }
 214
 215 static krb5_error_code
 216 ccache_init_system(void)
 217 {
 218     kcm_ccache ccache;
 219     krb5_error_code ret;
 220
 221     if (system_cache_name == NULL)
 222         system_cache_name = kcm_system_config_get_string("cc_name");
 223
 224     ret = kcm_ccache_new(kcm_context,
 225                          system_cache_name ? system_cache_name : "SYSTEM",
 226                          &ccache);
 227     if (ret)
 228         return ret;
 229
 230     ccache->flags |= KCM_FLAGS_OWNER_IS_SYSTEM;
 231     ccache->flags |= KCM_FLAGS_USE_KEYTAB;
 232
 233     ret = parse_owners(ccache);
 234     if (ret)
 235         return ret;
 236
 237     ret = krb5_parse_name(kcm_context, system_principal, &ccache->client);
 238     if (ret) {
 239         kcm_release_ccache(kcm_context, &ccache);
 240         return ret;
 241     }
 242
 243     if (system_server == NULL)
 244         system_server = kcm_system_config_get_string("server");
 245
 246     if (system_server != NULL) {
 247         ret = krb5_parse_name(kcm_context, system_server, &ccache->server);
 248         if (ret) {
 249             kcm_release_ccache(kcm_context, &ccache);
 250             return ret;
 251         }
 252     }
 253
 254     if (system_keytab == NULL)
 255         system_keytab = kcm_system_config_get_string("keytab_name");
 256
 257     if (system_keytab != NULL) {
 258         ret = krb5_kt_resolve(kcm_context, system_keytab, &ccache->key.keytab);
 259     } else {
 260         ret = krb5_kt_default(kcm_context, &ccache->key.keytab);
 261     }
 262     if (ret) {
 263         kcm_release_ccache(kcm_context, &ccache);
 264         return ret;
 265     }
 266
 267     if (renew_life == NULL)
 268         renew_life = kcm_system_config_get_string("renew_life");
 269
 270     if (renew_life == NULL)
 271         renew_life = "1 month";
 272
 273     if (renew_life != NULL) {
 274         ccache->renew_life = parse_time(renew_life, "s");
 275         if (ccache->renew_life < 0) {
 276             kcm_release_ccache(kcm_context, &ccache);
 277             return EINVAL;
 278         }
 279     }
 280
 281     if (ticket_life == NULL)
 282         ticket_life = kcm_system_config_get_string("ticket_life");
 283
 284     if (ticket_life != NULL) {
 285         ccache->tkt_life = parse_time(ticket_life, "s");
 286         if (ccache->tkt_life < 0) {
 287             kcm_release_ccache(kcm_context, &ccache);
 288             return EINVAL;
 289         }
 290     }
 291
 292     if (system_perms == NULL)
 293         system_perms = kcm_system_config_get_string("mode");
 294
 295     if (system_perms != NULL) {
 296         int mode;
 297
 298         if (sscanf(system_perms, "%o", &mode) != 1)
 299             return EINVAL;
 300
 301         ccache->mode = mode;
 302     }
 303
 304     if (disallow_getting_krbtgt == -1) {
 305         disallow_getting_krbtgt =
 306             krb5_config_get_bool_default(kcm_context, NULL, FALSE, "kcm",
 307                                          "disallow-getting-krbtgt", NULL);
 308     }
 309
 310     /* enqueue default actions for credentials cache */
 311     ret = kcm_ccache_enqueue_default(kcm_context, ccache, NULL);
 312
 313     kcm_release_ccache(kcm_context, &ccache); /* retained by event queue */
 314
 315     return ret;
 316 }
 317
 318 void
 319 kcm_configure(int argc, char **argv)
 320 {
 321     krb5_error_code ret;
 322     int optind = 0;
 323     const char *p;
 324
 325     while(getarg(args, num_args, argc, argv, &optind))
 326         warnx("error at argument `%s'", argv[optind]);
 327
 328     if(help_flag)
 329         usage (0);
 330
 331     if (version_flag) {
 332         print_version(NULL);
 333         exit(0);
 334     }
 335
 336     argc -= optind;
 337     argv += optind;
 338
 339     if (argc != 0)
 340         usage(1);
 341
 342     {
 343         char **files;
 344
 345         if(config_file == NULL)
 346             config_file = _PATH_KCM_CONF;
 347
 348         ret = krb5_prepend_config_files_default(config_file, &files);
 349         if (ret)
 350             krb5_err(kcm_context, 1, ret, "getting configuration files");
 351
 352         ret = krb5_set_config_files(kcm_context, files);
 353         krb5_free_config_files(files);
 354         if(ret)
 355             krb5_err(kcm_context, 1, ret, "reading configuration files");
 356     }
 357
 358     if(max_request_str)
 359         max_request = parse_bytes(max_request_str, NULL);
 360
 361     if(max_request == 0){
 362         p = krb5_config_get_string (kcm_context,
 363                                     NULL,
 364                                     "kcm",
 365                                     "max-request",
 366                                     NULL);
 367         if(p)
 368             max_request = parse_bytes(p, NULL);
 369     }
 370
 371     if (system_principal == NULL) {
 372         system_principal = kcm_system_config_get_string("principal");
 373     }
 374
 375     if (system_principal != NULL) {
 376         ret = ccache_init_system();
 377         if (ret)
 378             krb5_err(kcm_context, 1, ret, "initializing system ccache");
 379     }
 380
 381     if(detach_from_console == -1)
 382         detach_from_console = krb5_config_get_bool_default(kcm_context, NULL,
 383                                                            DETACH_IS_DEFAULT,
 384                                                            "kcm",
 385                                                            "detach", NULL);
 386     kcm_openlog();
 387     if(max_request == 0)
 388         max_request = 64 * 1024;
 389 }
 390