source3/passdb/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 #include "dbwrap.h"
  24 #include "../libcli/security/security.h"
  25 static struct db_context *db;
  26
  27 /* cache all entries for 60 seconds for to save ldap-queries (cache is updated
  28  * after this period if admins do not use pdbedit or usermanager but manipulate
  29  * ldap directly) - gd */
  30
  31 #define DATABASE_VERSION        3
  32 #define AP_TTL                  60
  33
  34
  35 struct ap_table {
  36         enum pdb_policy_type type;
  37         const char *string;
  38         uint32 default_val;
  39         const char *description;
  40         const char *ldap_attr;
  41 };
  42
  43 static const struct ap_table account_policy_names[] = {
  44         {PDB_POLICY_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
  45                 "Minimal password length (default: 5)",
  46                 "sambaMinPwdLength" },
  47
  48         {PDB_POLICY_PASSWORD_HISTORY, "password history", 0,
  49                 "Length of Password History Entries (default: 0 => off)",
  50                 "sambaPwdHistoryLength" },
  51
  52         {PDB_POLICY_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
  53                 "Force Users to logon for password change (default: 0 => off, 2 => on)",
  54                 "sambaLogonToChgPwd" },
  55
  56         {PDB_POLICY_MAX_PASSWORD_AGE, "maximum password age", (uint32) -1,
  57                 "Maximum password age, in seconds (default: -1 => never expire passwords)",
  58                 "sambaMaxPwdAge" },
  59
  60         {PDB_POLICY_MIN_PASSWORD_AGE,"minimum password age", 0,
  61                 "Minimal password age, in seconds (default: 0 => allow immediate password change)",
  62                 "sambaMinPwdAge" },
  63
  64         {PDB_POLICY_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
  65                 "Lockout duration in minutes (default: 30, -1 => forever)",
  66                 "sambaLockoutDuration" },
  67
  68         {PDB_POLICY_RESET_COUNT_TIME, "reset count minutes", 30,
  69                 "Reset time after lockout in minutes (default: 30)",
  70                 "sambaLockoutObservationWindow" },
  71
  72         {PDB_POLICY_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
  73                 "Lockout users after bad logon attempts (default: 0 => off)",
  74                 "sambaLockoutThreshold" },
  75
  76         {PDB_POLICY_TIME_TO_LOGOUT, "disconnect time", (uint32) -1,
  77                 "Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
  78                 "sambaForceLogoff" },
  79
  80         {PDB_POLICY_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
  81                 "Allow Machine Password changes (default: 0 => off)",
  82                 "sambaRefuseMachinePwdChange" },
  83
  84         {0, NULL, 0, "", NULL}
  85 };
  86
  87 void account_policy_names_list(const char ***names, int *num_names)
  88 {
  89         const char **nl;
  90         int i, count;
  91
  92         for (count=0; account_policy_names[count].string; count++) {
  93         }
  94         nl = SMB_MALLOC_ARRAY(const char *, count);
  95         if (!nl) {
  96                 *num_names = 0;
  97                 return;
  98         }
  99         for (i=0; account_policy_names[i].string; i++) {
 100                 nl[i] = account_policy_names[i].string;
 101         }
 102         *num_names = count;
 103         *names = nl;
 104         return;
 105 }
 106
 107 /****************************************************************************
 108 Get the account policy name as a string from its #define'ed number
 109 ****************************************************************************/
 110
 111 const char *decode_account_policy_name(enum pdb_policy_type type)
 112 {
 113         int i;
 114         for (i=0; account_policy_names[i].string; i++) {
 115                 if (type == account_policy_names[i].type) {
 116                         return account_policy_names[i].string;
 117                 }
 118         }
 119         return NULL;
 120 }
 121
 122 /****************************************************************************
 123 Get the account policy LDAP attribute as a string from its #define'ed number
 124 ****************************************************************************/
 125
 126 const char *get_account_policy_attr(enum pdb_policy_type type)
 127 {
 128         int i;
 129         for (i=0; account_policy_names[i].type; i++) {
 130                 if (type == account_policy_names[i].type) {
 131                         return account_policy_names[i].ldap_attr;
 132                 }
 133         }
 134         return NULL;
 135 }
 136
 137 /****************************************************************************
 138 Get the account policy description as a string from its #define'ed number
 139 ****************************************************************************/
 140
 141 const char *account_policy_get_desc(enum pdb_policy_type type)
 142 {
 143         int i;
 144         for (i=0; account_policy_names[i].string; i++) {
 145                 if (type == account_policy_names[i].type) {
 146                         return account_policy_names[i].description;
 147                 }
 148         }
 149         return NULL;
 150 }
 151
 152 /****************************************************************************
 153 Get the account policy name as a string from its #define'ed number
 154 ****************************************************************************/
 155
 156 enum pdb_policy_type account_policy_name_to_typenum(const char *name)
 157 {
 158         int i;
 159         for (i=0; account_policy_names[i].string; i++) {
 160                 if (strcmp(name, account_policy_names[i].string) == 0) {
 161                         return account_policy_names[i].type;
 162                 }
 163         }
 164         return 0;
 165 }
 166
 167 /*****************************************************************************
 168 Get default value for account policy
 169 *****************************************************************************/
 170
 171 bool account_policy_get_default(enum pdb_policy_type type, uint32_t *val)
 172 {
 173         int i;
 174         for (i=0; account_policy_names[i].type; i++) {
 175                 if (account_policy_names[i].type == type) {
 176                         *val = account_policy_names[i].default_val;
 177                         return True;
 178                 }
 179         }
 180         DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
 181                 type));
 182         return False;
 183 }
 184
 185 /*****************************************************************************
 186  Set default for a type if it is empty
 187 *****************************************************************************/
 188
 189 static bool account_policy_set_default_on_empty(enum pdb_policy_type type)
 190 {
 191
 192         uint32 value;
 193
 194         if (!account_policy_get(type, &value) &&
 195             !account_policy_get_default(type, &value)) {
 196                 return False;
 197         }
 198
 199         return account_policy_set(type, value);
 200 }
 201
 202 /*****************************************************************************
 203  Open the account policy tdb.
 204 ***`*************************************************************************/
 205
 206 bool init_account_policy(void)
 207 {
 208
 209         const char *vstring = "INFO/version";
 210         uint32 version;
 211         int i;
 212
 213         if (db != NULL) {
 214                 return True;
 215         }
 216
 217         db = db_open(NULL, state_path("account_policy.tdb"), 0, TDB_DEFAULT,
 218                      O_RDWR, 0600);
 219
 220         if (db == NULL) { /* the account policies files does not exist or open
 221                            * failed, try to create a new one */
 222                 db = db_open(NULL, state_path("account_policy.tdb"), 0,
 223                              TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
 224                 if (db == NULL) {
 225                         DEBUG(0,("Failed to open account policy database\n"));
 226                         return False;
 227                 }
 228         }
 229
 230         version = dbwrap_fetch_int32(db, vstring);
 231         if (version == DATABASE_VERSION) {
 232                 return true;
 233         }
 234
 235         /* handle a Samba upgrade */
 236
 237         if (db->transaction_start(db) != 0) {
 238                 DEBUG(0, ("transaction_start failed\n"));
 239                 TALLOC_FREE(db);
 240                 return false;
 241         }
 242
 243         version = dbwrap_fetch_int32(db, vstring);
 244         if (version == DATABASE_VERSION) {
 245                 /*
 246                  * Race condition
 247                  */
 248                 if (db->transaction_cancel(db)) {
 249                         smb_panic("transaction_cancel failed");
 250                 }
 251                 return true;
 252         }
 253
 254         if (version != DATABASE_VERSION) {
 255                 if (dbwrap_store_uint32(db, vstring, DATABASE_VERSION) != 0) {
 256                         DEBUG(0, ("dbwrap_store_uint32 failed\n"));
 257                         goto cancel;
 258                 }
 259
 260                 for (i=0; account_policy_names[i].type; i++) {
 261
 262                         if (!account_policy_set_default_on_empty(account_policy_names[i].type)) {
 263                                 DEBUG(0,("failed to set default value in account policy tdb\n"));
 264                                 goto cancel;
 265                         }
 266                 }
 267         }
 268
 269         /* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
 270
 271         privilege_create_account( &global_sid_World );
 272         privilege_create_account( &global_sid_Builtin_Account_Operators );
 273         privilege_create_account( &global_sid_Builtin_Server_Operators );
 274         privilege_create_account( &global_sid_Builtin_Print_Operators );
 275         privilege_create_account( &global_sid_Builtin_Backup_Operators );
 276
 277         /* BUILTIN\Administrators get everything -- *always* */
 278
 279         if ( lp_enable_privileges() ) {
 280                 if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
 281                         DEBUG(1,("init_account_policy: Failed to grant privileges "
 282                                 "to BUILTIN\\Administrators!\n"));
 283                 }
 284         }
 285
 286         if (db->transaction_commit(db) != 0) {
 287                 DEBUG(0, ("transaction_commit failed\n"));
 288                 TALLOC_FREE(db);
 289                 return false;
 290         }
 291
 292         return True;
 293
 294  cancel:
 295         if (db->transaction_cancel(db)) {
 296                 smb_panic("transaction_cancel failed");
 297         }
 298         TALLOC_FREE(db);
 299
 300         return false;
 301 }
 302
 303 /*****************************************************************************
 304 Get an account policy (from tdb)
 305 *****************************************************************************/
 306
 307 bool account_policy_get(enum pdb_policy_type type, uint32_t *value)
 308 {
 309         const char *name;
 310         uint32 regval;
 311
 312         if (!init_account_policy()) {
 313                 return False;
 314         }
 315
 316         if (value) {
 317                 *value = 0;
 318         }
 319
 320         name = decode_account_policy_name(type);
 321         if (name == NULL) {
 322                 DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type!  Cannot get, returning 0.\n", type));
 323                 return False;
 324         }
 325
 326         if (!dbwrap_fetch_uint32(db, name, &regval)) {
 327                 DEBUG(1, ("account_policy_get: tdb_fetch_uint32 failed for type %d (%s), returning 0\n", type, name));
 328                 return False;
 329         }
 330
 331         if (value) {
 332                 *value = regval;
 333         }
 334
 335         DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
 336         return True;
 337 }
 338
 339
 340 /****************************************************************************
 341 Set an account policy (in tdb)
 342 ****************************************************************************/
 343
 344 bool account_policy_set(enum pdb_policy_type type, uint32_t value)
 345 {
 346         const char *name;
 347         NTSTATUS status;
 348
 349         if (!init_account_policy()) {
 350                 return False;
 351         }
 352
 353         name = decode_account_policy_name(type);
 354         if (name == NULL) {
 355                 DEBUG(1, ("Field %d is not a valid account policy type!  Cannot set.\n", type));
 356                 return False;
 357         }
 358
 359         status = dbwrap_trans_store_uint32(db, name, value);
 360         if (!NT_STATUS_IS_OK(status)) {
 361                 DEBUG(1, ("store_uint32 failed for type %d (%s) on value "
 362                           "%u: %s\n", type, name, value, nt_errstr(status)));
 363                 return False;
 364         }
 365
 366         DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
 367
 368         return True;
 369 }
 370
 371 /****************************************************************************
 372 Set an account policy in the cache
 373 ****************************************************************************/
 374
 375 bool cache_account_policy_set(enum pdb_policy_type type, uint32_t value)
 376 {
 377         const char *policy_name = NULL;
 378         char *cache_key = NULL;
 379         char *cache_value = NULL;
 380         bool ret = False;
 381
 382         policy_name = decode_account_policy_name(type);
 383         if (policy_name == NULL) {
 384                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 385                 return False;
 386         }
 387
 388         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 389                 DEBUG(0, ("asprintf failed\n"));
 390                 goto done;
 391         }
 392
 393         if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
 394                 DEBUG(0, ("asprintf failed\n"));
 395                 goto done;
 396         }
 397
 398         DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
 399
 400         ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
 401
 402  done:
 403         SAFE_FREE(cache_key);
 404         SAFE_FREE(cache_value);
 405         return ret;
 406 }
 407
 408 /*****************************************************************************
 409 Get an account policy from the cache
 410 *****************************************************************************/
 411
 412 bool cache_account_policy_get(enum pdb_policy_type type, uint32_t *value)
 413 {
 414         const char *policy_name = NULL;
 415         char *cache_key = NULL;
 416         char *cache_value = NULL;
 417         bool ret = False;
 418
 419         policy_name = decode_account_policy_name(type);
 420         if (policy_name == NULL) {
 421                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 422                 return False;
 423         }
 424
 425         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 426                 DEBUG(0, ("asprintf failed\n"));
 427                 goto done;
 428         }
 429
 430         if (gencache_get(cache_key, &cache_value, NULL)) {
 431                 uint32 tmp = strtoul(cache_value, NULL, 10);
 432                 *value = tmp;
 433                 ret = True;
 434         }
 435
 436  done:
 437         SAFE_FREE(cache_key);
 438         SAFE_FREE(cache_value);
 439         return ret;
 440 }
 441
 442 /****************************************************************************
 443 ****************************************************************************/
 444
 445 struct db_context *get_account_pol_db( void )
 446 {
 447
 448         if ( db == NULL ) {
 449                 if ( !init_account_policy() ) {
 450                         return NULL;
 451                 }
 452         }
 453
 454         return db;
 455 }