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 "system/filesys.h"
  24 #include "passdb.h"
  25 #include "dbwrap/dbwrap.h"
  26 #include "dbwrap/dbwrap_open.h"
  27 #include "../libcli/security/security.h"
  28 #include "lib/privileges.h"
  29
  30 static struct db_context *db;
  31
  32 /* cache all entries for 60 seconds for to save ldap-queries (cache is updated
  33  * after this period if admins do not use pdbedit or usermanager but manipulate
  34  * ldap directly) - gd */
  35
  36 #define DATABASE_VERSION        3
  37 #define AP_TTL                  60
  38
  39
  40 struct ap_table {
  41         enum pdb_policy_type type;
  42         const char *string;
  43         uint32_t default_val;
  44         const char *description;
  45         const char *ldap_attr;
  46 };
  47
  48 static const struct ap_table account_policy_names[] = {
  49         {PDB_POLICY_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
  50                 "Minimal password length (default: 5)",
  51                 "sambaMinPwdLength" },
  52
  53         {PDB_POLICY_PASSWORD_HISTORY, "password history", 0,
  54                 "Length of Password History Entries (default: 0 => off)",
  55                 "sambaPwdHistoryLength" },
  56
  57         {PDB_POLICY_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
  58                 "Force Users to logon for password change (default: 0 => off, 2 => on)",
  59                 "sambaLogonToChgPwd" },
  60
  61         {PDB_POLICY_MAX_PASSWORD_AGE, "maximum password age", (uint32_t) -1,
  62                 "Maximum password age, in seconds (default: -1 => never expire passwords)",
  63                 "sambaMaxPwdAge" },
  64
  65         {PDB_POLICY_MIN_PASSWORD_AGE,"minimum password age", 0,
  66                 "Minimal password age, in seconds (default: 0 => allow immediate password change)",
  67                 "sambaMinPwdAge" },
  68
  69         {PDB_POLICY_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
  70                 "Lockout duration in minutes (default: 30, -1 => forever)",
  71                 "sambaLockoutDuration" },
  72
  73         {PDB_POLICY_RESET_COUNT_TIME, "reset count minutes", 30,
  74                 "Reset time after lockout in minutes (default: 30)",
  75                 "sambaLockoutObservationWindow" },
  76
  77         {PDB_POLICY_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
  78                 "Lockout users after bad logon attempts (default: 0 => off)",
  79                 "sambaLockoutThreshold" },
  80
  81         {PDB_POLICY_TIME_TO_LOGOUT, "disconnect time", (uint32_t) -1,
  82                 "Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
  83                 "sambaForceLogoff" },
  84
  85         {PDB_POLICY_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
  86                 "Allow Machine Password changes (default: 0 => off)",
  87                 "sambaRefuseMachinePwdChange" },
  88
  89         {0, NULL, 0, "", NULL}
  90 };
  91
  92 void account_policy_names_list(TALLOC_CTX *mem_ctx, const char ***names, int *num_names)
  93 {
  94         const char **nl;
  95         int i, count = ARRAY_SIZE(account_policy_names);
  96
  97         nl = talloc_array(mem_ctx, const char *, count);
  98         if (!nl) {
  99                 *num_names = 0;
 100                 return;
 101         }
 102         for (i=0; i<count; i++) {
 103                 nl[i] = account_policy_names[i].string;
 104         }
 105         /* Do not return the last null entry */
 106         *num_names = count-1;
 107         *names = nl;
 108         return;
 109 }
 110
 111 /****************************************************************************
 112 Get the account policy name as a string from its #define'ed number
 113 ****************************************************************************/
 114
 115 const char *decode_account_policy_name(enum pdb_policy_type type)
 116 {
 117         int i;
 118         for (i=0; account_policy_names[i].string; i++) {
 119                 if (type == account_policy_names[i].type) {
 120                         return account_policy_names[i].string;
 121                 }
 122         }
 123         return NULL;
 124 }
 125
 126 /****************************************************************************
 127 Get the account policy LDAP attribute as a string from its #define'ed number
 128 ****************************************************************************/
 129
 130 const char *get_account_policy_attr(enum pdb_policy_type type)
 131 {
 132         int i;
 133         for (i=0; account_policy_names[i].type; i++) {
 134                 if (type == account_policy_names[i].type) {
 135                         return account_policy_names[i].ldap_attr;
 136                 }
 137         }
 138         return NULL;
 139 }
 140
 141 /****************************************************************************
 142 Get the account policy description as a string from its #define'ed number
 143 ****************************************************************************/
 144
 145 const char *account_policy_get_desc(enum pdb_policy_type type)
 146 {
 147         int i;
 148         for (i=0; account_policy_names[i].string; i++) {
 149                 if (type == account_policy_names[i].type) {
 150                         return account_policy_names[i].description;
 151                 }
 152         }
 153         return NULL;
 154 }
 155
 156 /****************************************************************************
 157 Get the account policy name as a string from its #define'ed number
 158 ****************************************************************************/
 159
 160 enum pdb_policy_type account_policy_name_to_typenum(const char *name)
 161 {
 162         int i;
 163         for (i=0; account_policy_names[i].string; i++) {
 164                 if (strcmp(name, account_policy_names[i].string) == 0) {
 165                         return account_policy_names[i].type;
 166                 }
 167         }
 168         return 0;
 169 }
 170
 171 /*****************************************************************************
 172 Get default value for account policy
 173 *****************************************************************************/
 174
 175 bool account_policy_get_default(enum pdb_policy_type type, uint32_t *val)
 176 {
 177         int i;
 178         for (i=0; account_policy_names[i].type; i++) {
 179                 if (account_policy_names[i].type == type) {
 180                         *val = account_policy_names[i].default_val;
 181                         return True;
 182                 }
 183         }
 184         DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
 185                 type));
 186         return False;
 187 }
 188
 189 /*****************************************************************************
 190  Set default for a type if it is empty
 191 *****************************************************************************/
 192
 193 static bool account_policy_set_default_on_empty(enum pdb_policy_type type)
 194 {
 195
 196         uint32_t value;
 197
 198         if (!account_policy_get(type, &value) &&
 199             !account_policy_get_default(type, &value)) {
 200                 return False;
 201         }
 202
 203         return account_policy_set(type, value);
 204 }
 205
 206 /*****************************************************************************
 207  Open the account policy tdb.
 208 ***`*************************************************************************/
 209
 210 bool init_account_policy(void)
 211 {
 212
 213         const char *vstring = "INFO/version";
 214         uint32_t version = 0;
 215         int i;
 216         NTSTATUS status;
 217         char *db_path;
 218
 219         if (db != NULL) {
 220                 return True;
 221         }
 222
 223         db_path = state_path("account_policy.tdb");
 224         if (db_path == NULL) {
 225                 return false;
 226         }
 227
 228         db = db_open(NULL, db_path, 0, TDB_DEFAULT,
 229                      O_RDWR, 0600, DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
 230
 231         if (db == NULL) { /* the account policies files does not exist or open
 232                            * failed, try to create a new one */
 233                 db = db_open(NULL, db_path, 0,
 234                              TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
 235                              DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
 236                 if (db == NULL) {
 237                         DEBUG(0,("Failed to open account policy database\n"));
 238                         TALLOC_FREE(db_path);
 239                         return False;
 240                 }
 241         }
 242         TALLOC_FREE(db_path);
 243
 244         status = dbwrap_fetch_uint32_bystring(db, vstring, &version);
 245         if (!NT_STATUS_IS_OK(status)) {
 246                 version = 0;
 247         }
 248
 249         if (version == DATABASE_VERSION) {
 250                 return true;
 251         }
 252
 253         /* handle a Samba upgrade */
 254
 255         if (dbwrap_transaction_start(db) != 0) {
 256                 DEBUG(0, ("transaction_start failed\n"));
 257                 TALLOC_FREE(db);
 258                 return false;
 259         }
 260
 261         status = dbwrap_fetch_uint32_bystring(db, vstring, &version);
 262         if (!NT_STATUS_IS_OK(status)) {
 263                 version = 0;
 264         }
 265
 266         if (version == DATABASE_VERSION) {
 267                 /*
 268                  * Race condition
 269                  */
 270                 if (dbwrap_transaction_cancel(db)) {
 271                         smb_panic("transaction_cancel failed");
 272                 }
 273                 return true;
 274         }
 275
 276         if (version != DATABASE_VERSION) {
 277                 status = dbwrap_store_uint32_bystring(db, vstring,
 278                                                       DATABASE_VERSION);
 279                 if (!NT_STATUS_IS_OK(status)) {
 280                         DEBUG(0, ("dbwrap_store_uint32_t failed: %s\n",
 281                                   nt_errstr(status)));
 282                         goto cancel;
 283                 }
 284
 285                 for (i=0; account_policy_names[i].type; i++) {
 286
 287                         if (!account_policy_set_default_on_empty(account_policy_names[i].type)) {
 288                                 DEBUG(0,("failed to set default value in account policy tdb\n"));
 289                                 goto cancel;
 290                         }
 291                 }
 292         }
 293
 294         /* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
 295
 296         privilege_create_account( &global_sid_World );
 297         privilege_create_account( &global_sid_Builtin_Account_Operators );
 298         privilege_create_account( &global_sid_Builtin_Server_Operators );
 299         privilege_create_account( &global_sid_Builtin_Print_Operators );
 300         privilege_create_account( &global_sid_Builtin_Backup_Operators );
 301
 302         /* BUILTIN\Administrators get everything -- *always* */
 303
 304         if ( lp_enable_privileges() ) {
 305                 if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
 306                         DEBUG(1,("init_account_policy: Failed to grant privileges "
 307                                 "to BUILTIN\\Administrators!\n"));
 308                 }
 309         }
 310
 311         if (dbwrap_transaction_commit(db) != 0) {
 312                 DEBUG(0, ("transaction_commit failed\n"));
 313                 TALLOC_FREE(db);
 314                 return false;
 315         }
 316
 317         return True;
 318
 319  cancel:
 320         if (dbwrap_transaction_cancel(db)) {
 321                 smb_panic("transaction_cancel failed");
 322         }
 323         TALLOC_FREE(db);
 324
 325         return false;
 326 }
 327
 328 /*****************************************************************************
 329 Get an account policy (from tdb)
 330 *****************************************************************************/
 331
 332 bool account_policy_get(enum pdb_policy_type type, uint32_t *value)
 333 {
 334         const char *name;
 335         uint32_t regval;
 336         NTSTATUS status;
 337
 338         if (!init_account_policy()) {
 339                 return False;
 340         }
 341
 342         if (value) {
 343                 *value = 0;
 344         }
 345
 346         name = decode_account_policy_name(type);
 347         if (name == NULL) {
 348                 DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type!  Cannot get, returning 0.\n", type));
 349                 return False;
 350         }
 351
 352         status = dbwrap_fetch_uint32_bystring(db, name, &regval);
 353         if (!NT_STATUS_IS_OK(status)) {
 354                 DEBUG(2, ("account_policy_get: tdb_fetch_uint32_t failed for type %d (%s), returning 0\n", type, name));
 355                 return False;
 356         }
 357
 358         if (value) {
 359                 *value = regval;
 360         }
 361
 362         DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
 363         return True;
 364 }
 365
 366
 367 /****************************************************************************
 368 Set an account policy (in tdb)
 369 ****************************************************************************/
 370
 371 bool account_policy_set(enum pdb_policy_type type, uint32_t value)
 372 {
 373         const char *name;
 374         NTSTATUS status;
 375
 376         if (!init_account_policy()) {
 377                 return False;
 378         }
 379
 380         name = decode_account_policy_name(type);
 381         if (name == NULL) {
 382                 DEBUG(1, ("Field %d is not a valid account policy type!  Cannot set.\n", type));
 383                 return False;
 384         }
 385
 386         status = dbwrap_trans_store_uint32_bystring(db, name, value);
 387         if (!NT_STATUS_IS_OK(status)) {
 388                 DEBUG(1, ("store_uint32_t failed for type %d (%s) on value "
 389                           "%u: %s\n", type, name, value, nt_errstr(status)));
 390                 return False;
 391         }
 392
 393         DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
 394
 395         return True;
 396 }
 397
 398 /****************************************************************************
 399 Set an account policy in the cache
 400 ****************************************************************************/
 401
 402 bool cache_account_policy_set(enum pdb_policy_type type, uint32_t value)
 403 {
 404         const char *policy_name = NULL;
 405         char *cache_key = NULL;
 406         char *cache_value = NULL;
 407         bool ret = False;
 408
 409         policy_name = decode_account_policy_name(type);
 410         if (policy_name == NULL) {
 411                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 412                 return False;
 413         }
 414
 415         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 416                 DEBUG(0, ("asprintf failed\n"));
 417                 goto done;
 418         }
 419
 420         if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
 421                 DEBUG(0, ("asprintf failed\n"));
 422                 goto done;
 423         }
 424
 425         DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
 426
 427         ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
 428
 429  done:
 430         SAFE_FREE(cache_key);
 431         SAFE_FREE(cache_value);
 432         return ret;
 433 }
 434
 435 /*****************************************************************************
 436 Get an account policy from the cache
 437 *****************************************************************************/
 438
 439 bool cache_account_policy_get(enum pdb_policy_type type, uint32_t *value)
 440 {
 441         const char *policy_name = NULL;
 442         char *cache_key = NULL;
 443         char *cache_value = NULL;
 444         bool ret = False;
 445
 446         policy_name = decode_account_policy_name(type);
 447         if (policy_name == NULL) {
 448                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 449                 return False;
 450         }
 451
 452         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 453                 DEBUG(0, ("asprintf failed\n"));
 454                 goto done;
 455         }
 456
 457         if (gencache_get(cache_key, talloc_tos(), &cache_value, NULL)) {
 458                 uint32_t tmp = strtoul(cache_value, NULL, 10);
 459                 *value = tmp;
 460                 ret = True;
 461         }
 462
 463  done:
 464         SAFE_FREE(cache_key);
 465         TALLOC_FREE(cache_value);
 466         return ret;
 467 }
 468
 469 /****************************************************************************
 470 ****************************************************************************/
 471
 472 struct db_context *get_account_pol_db( void )
 473 {
 474
 475         if ( db == NULL ) {
 476                 if ( !init_account_policy() ) {
 477                         return NULL;
 478                 }
 479         }
 480
 481         return db;
 482 }