source/lib/account_pol.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  account policy storage
   4  *  Copyright (C) Jean François Micouleau      1998-2001.
   5  *  Copyright (C) Andrew Bartlett              2002
   6  *  Copyright (C) Guenther Deschner            2004-2005
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 static struct db_context *db;
  24
  25 /* cache all entries for 60 seconds for to save ldap-queries (cache is updated
  26  * after this period if admins do not use pdbedit or usermanager but manipulate
  27  * ldap directly) - gd */
  28
  29 #define DATABASE_VERSION        3
  30 #define AP_TTL                  60
  31
  32
  33 struct ap_table {
  34         int field;
  35         const char *string;
  36         uint32 default_val;
  37         const char *description;
  38         const char *ldap_attr;
  39 };
  40
  41 static const struct ap_table account_policy_names[] = {
  42         {AP_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
  43                 "Minimal password length (default: 5)",
  44                 "sambaMinPwdLength" },
  45
  46         {AP_PASSWORD_HISTORY, "password history", 0,
  47                 "Length of Password History Entries (default: 0 => off)",
  48                 "sambaPwdHistoryLength" },
  49
  50         {AP_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
  51                 "Force Users to logon for password change (default: 0 => off, 2 => on)",
  52                 "sambaLogonToChgPwd" },
  53
  54         {AP_MAX_PASSWORD_AGE, "maximum password age", (uint32) -1,
  55                 "Maximum password age, in seconds (default: -1 => never expire passwords)",
  56                 "sambaMaxPwdAge" },
  57
  58         {AP_MIN_PASSWORD_AGE,"minimum password age", 0,
  59                 "Minimal password age, in seconds (default: 0 => allow immediate password change)",
  60                 "sambaMinPwdAge" },
  61
  62         {AP_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
  63                 "Lockout duration in minutes (default: 30, -1 => forever)",
  64                 "sambaLockoutDuration" },
  65
  66         {AP_RESET_COUNT_TIME, "reset count minutes", 30,
  67                 "Reset time after lockout in minutes (default: 30)",
  68                 "sambaLockoutObservationWindow" },
  69
  70         {AP_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
  71                 "Lockout users after bad logon attempts (default: 0 => off)",
  72                 "sambaLockoutThreshold" },
  73
  74         {AP_TIME_TO_LOGOUT, "disconnect time", (uint32) -1,
  75                 "Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
  76                 "sambaForceLogoff" },
  77
  78         {AP_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
  79                 "Allow Machine Password changes (default: 0 => off)",
  80                 "sambaRefuseMachinePwdChange" },
  81
  82         {0, NULL, 0, "", NULL}
  83 };
  84
  85 void account_policy_names_list(const char ***names, int *num_names)
  86 {
  87         const char **nl;
  88         int i, count;
  89
  90         for (count=0; account_policy_names[count].string; count++) {
  91         }
  92         nl = SMB_MALLOC_ARRAY(const char *, count);
  93         if (!nl) {
  94                 *num_names = 0;
  95                 return;
  96         }
  97         for (i=0; account_policy_names[i].string; i++) {
  98                 nl[i] = account_policy_names[i].string;
  99         }
 100         *num_names = count;
 101         *names = nl;
 102         return;
 103 }
 104
 105 /****************************************************************************
 106 Get the account policy name as a string from its #define'ed number
 107 ****************************************************************************/
 108
 109 const char *decode_account_policy_name(int field)
 110 {
 111         int i;
 112         for (i=0; account_policy_names[i].string; i++) {
 113                 if (field == account_policy_names[i].field) {
 114                         return account_policy_names[i].string;
 115                 }
 116         }
 117         return NULL;
 118 }
 119
 120 /****************************************************************************
 121 Get the account policy LDAP attribute as a string from its #define'ed number
 122 ****************************************************************************/
 123
 124 const char *get_account_policy_attr(int field)
 125 {
 126         int i;
 127         for (i=0; account_policy_names[i].field; i++) {
 128                 if (field == account_policy_names[i].field) {
 129                         return account_policy_names[i].ldap_attr;
 130                 }
 131         }
 132         return NULL;
 133 }
 134
 135 /****************************************************************************
 136 Get the account policy description as a string from its #define'ed number
 137 ****************************************************************************/
 138
 139 const char *account_policy_get_desc(int field)
 140 {
 141         int i;
 142         for (i=0; account_policy_names[i].string; i++) {
 143                 if (field == account_policy_names[i].field) {
 144                         return account_policy_names[i].description;
 145                 }
 146         }
 147         return NULL;
 148 }
 149
 150 /****************************************************************************
 151 Get the account policy name as a string from its #define'ed number
 152 ****************************************************************************/
 153
 154 int account_policy_name_to_fieldnum(const char *name)
 155 {
 156         int i;
 157         for (i=0; account_policy_names[i].string; i++) {
 158                 if (strcmp(name, account_policy_names[i].string) == 0) {
 159                         return account_policy_names[i].field;
 160                 }
 161         }
 162         return 0;
 163 }
 164
 165 /*****************************************************************************
 166 Get default value for account policy
 167 *****************************************************************************/
 168
 169 bool account_policy_get_default(int account_policy, uint32 *val)
 170 {
 171         int i;
 172         for (i=0; account_policy_names[i].field; i++) {
 173                 if (account_policy_names[i].field == account_policy) {
 174                         *val = account_policy_names[i].default_val;
 175                         return True;
 176                 }
 177         }
 178         DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
 179                 account_policy));
 180         return False;
 181 }
 182
 183 /*****************************************************************************
 184  Set default for a field if it is empty
 185 *****************************************************************************/
 186
 187 static bool account_policy_set_default_on_empty(int account_policy)
 188 {
 189
 190         uint32 value;
 191
 192         if (!account_policy_get(account_policy, &value) &&
 193             !account_policy_get_default(account_policy, &value)) {
 194                 return False;
 195         }
 196
 197         return account_policy_set(account_policy, value);
 198 }
 199
 200 /*****************************************************************************
 201  Open the account policy tdb.
 202 ***`*************************************************************************/
 203
 204 bool init_account_policy(void)
 205 {
 206
 207         const char *vstring = "INFO/version";
 208         uint32 version;
 209         int i;
 210
 211         if (db != NULL) {
 212                 return True;
 213         }
 214
 215         db = db_open(NULL, state_path("account_policy.tdb"), 0, TDB_DEFAULT,
 216                      O_RDWR, 0600);
 217
 218         if (db == NULL) { /* the account policies files does not exist or open
 219                            * failed, try to create a new one */
 220                 db = db_open(NULL, state_path("account_policy.tdb"), 0,
 221                              TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
 222                 if (db == NULL) {
 223                         DEBUG(0,("Failed to open account policy database\n"));
 224                         return False;
 225                 }
 226         }
 227
 228         version = dbwrap_fetch_int32(db, vstring);
 229         if (version == DATABASE_VERSION) {
 230                 return true;
 231         }
 232
 233         /* handle a Samba upgrade */
 234
 235         if (db->transaction_start(db) != 0) {
 236                 DEBUG(0, ("transaction_start failed\n"));
 237                 TALLOC_FREE(db);
 238                 return false;
 239         }
 240
 241         version = dbwrap_fetch_int32(db, vstring);
 242         if (version == DATABASE_VERSION) {
 243                 /*
 244                  * Race condition
 245                  */
 246                 if (db->transaction_cancel(db)) {
 247                         smb_panic("transaction_cancel failed");
 248                 }
 249                 return true;
 250         }
 251
 252         if (version != DATABASE_VERSION) {
 253                 if (dbwrap_store_uint32(db, vstring, DATABASE_VERSION) != 0) {
 254                         DEBUG(0, ("dbwrap_store_uint32 failed\n"));
 255                         goto cancel;
 256                 }
 257
 258                 for (i=0; account_policy_names[i].field; i++) {
 259
 260                         if (!account_policy_set_default_on_empty(account_policy_names[i].field)) {
 261                                 DEBUG(0,("failed to set default value in account policy tdb\n"));
 262                                 goto cancel;
 263                         }
 264                 }
 265         }
 266
 267         /* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
 268
 269         privilege_create_account( &global_sid_World );
 270         privilege_create_account( &global_sid_Builtin_Account_Operators );
 271         privilege_create_account( &global_sid_Builtin_Server_Operators );
 272         privilege_create_account( &global_sid_Builtin_Print_Operators );
 273         privilege_create_account( &global_sid_Builtin_Backup_Operators );
 274
 275         /* BUILTIN\Administrators get everything -- *always* */
 276
 277         if ( lp_enable_privileges() ) {
 278                 if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
 279                         DEBUG(1,("init_account_policy: Failed to grant privileges "
 280                                 "to BUILTIN\\Administrators!\n"));
 281                 }
 282         }
 283
 284         if (db->transaction_commit(db) != 0) {
 285                 DEBUG(0, ("transaction_commit failed\n"));
 286                 TALLOC_FREE(db);
 287                 return false;
 288         }
 289
 290         return True;
 291
 292  cancel:
 293         if (db->transaction_cancel(db)) {
 294                 smb_panic("transaction_cancel failed");
 295         }
 296         TALLOC_FREE(db);
 297
 298         return false;
 299 }
 300
 301 /*****************************************************************************
 302 Get an account policy (from tdb)
 303 *****************************************************************************/
 304
 305 bool account_policy_get(int field, uint32 *value)
 306 {
 307         const char *name;
 308         uint32 regval;
 309
 310         if (!init_account_policy()) {
 311                 return False;
 312         }
 313
 314         if (value) {
 315                 *value = 0;
 316         }
 317
 318         name = decode_account_policy_name(field);
 319         if (name == NULL) {
 320                 DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type!  Cannot get, returning 0.\n", field));
 321                 return False;
 322         }
 323
 324         if (!dbwrap_fetch_uint32(db, name, &regval)) {
 325                 DEBUG(1, ("account_policy_get: tdb_fetch_uint32 failed for field %d (%s), returning 0\n", field, name));
 326                 return False;
 327         }
 328
 329         if (value) {
 330                 *value = regval;
 331         }
 332
 333         DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
 334         return True;
 335 }
 336
 337
 338 /****************************************************************************
 339 Set an account policy (in tdb)
 340 ****************************************************************************/
 341
 342 bool account_policy_set(int field, uint32 value)
 343 {
 344         const char *name;
 345         NTSTATUS status;
 346
 347         if (!init_account_policy()) {
 348                 return False;
 349         }
 350
 351         name = decode_account_policy_name(field);
 352         if (name == NULL) {
 353                 DEBUG(1, ("Field %d is not a valid account policy type!  Cannot set.\n", field));
 354                 return False;
 355         }
 356
 357         status = dbwrap_trans_store_uint32(db, name, value);
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 DEBUG(1, ("store_uint32 failed for field %d (%s) on value "
 360                           "%u: %s\n", field, name, value, nt_errstr(status)));
 361                 return False;
 362         }
 363
 364         DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
 365
 366         return True;
 367 }
 368
 369 /****************************************************************************
 370 Set an account policy in the cache
 371 ****************************************************************************/
 372
 373 bool cache_account_policy_set(int field, uint32 value)
 374 {
 375         const char *policy_name = NULL;
 376         char *cache_key = NULL;
 377         char *cache_value = NULL;
 378         bool ret = False;
 379
 380         policy_name = decode_account_policy_name(field);
 381         if (policy_name == NULL) {
 382                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 383                 return False;
 384         }
 385
 386         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 387                 DEBUG(0, ("asprintf failed\n"));
 388                 goto done;
 389         }
 390
 391         if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
 392                 DEBUG(0, ("asprintf failed\n"));
 393                 goto done;
 394         }
 395
 396         DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
 397
 398         ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
 399
 400  done:
 401         SAFE_FREE(cache_key);
 402         SAFE_FREE(cache_value);
 403         return ret;
 404 }
 405
 406 /*****************************************************************************
 407 Get an account policy from the cache
 408 *****************************************************************************/
 409
 410 bool cache_account_policy_get(int field, uint32 *value)
 411 {
 412         const char *policy_name = NULL;
 413         char *cache_key = NULL;
 414         char *cache_value = NULL;
 415         bool ret = False;
 416
 417         policy_name = decode_account_policy_name(field);
 418         if (policy_name == NULL) {
 419                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 420                 return False;
 421         }
 422
 423         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 424                 DEBUG(0, ("asprintf failed\n"));
 425                 goto done;
 426         }
 427
 428         if (gencache_get(cache_key, &cache_value, NULL)) {
 429                 uint32 tmp = strtoul(cache_value, NULL, 10);
 430                 *value = tmp;
 431                 ret = True;
 432         }
 433
 434  done:
 435         SAFE_FREE(cache_key);
 436         SAFE_FREE(cache_value);
 437         return ret;
 438 }
 439
 440 /****************************************************************************
 441 ****************************************************************************/
 442
 443 struct db_context *get_account_pol_db( void )
 444 {
 445
 446         if ( db == NULL ) {
 447                 if ( !init_account_policy() ) {
 448                         return NULL;
 449                 }
 450         }
 451
 452         return db;
 453 }
 454