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, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include "includes.h"
  24 static TDB_CONTEXT *tdb;
  25
  26 /* cache all entries for 60 seconds for to save ldap-queries (cache is updated
  27  * after this period if admins do not use pdbedit or usermanager but manipulate
  28  * ldap directly) - gd */
  29
  30 #define DATABASE_VERSION        3
  31 #define AP_TTL                  60
  32
  33
  34 struct ap_table {
  35         int field;
  36         const char *string;
  37         uint32 default_val;
  38         const char *description;
  39         const char *ldap_attr;
  40 };
  41
  42 static const struct ap_table account_policy_names[] = {
  43         {AP_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
  44                 "Minimal password length (default: 5)",
  45                 "sambaMinPwdLength" },
  46
  47         {AP_PASSWORD_HISTORY, "password history", 0,
  48                 "Length of Password History Entries (default: 0 => off)",
  49                 "sambaPwdHistoryLength" },
  50
  51         {AP_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
  52                 "Force Users to logon for password change (default: 0 => off, 2 => on)",
  53                 "sambaLogonToChgPwd" },
  54
  55         {AP_MAX_PASSWORD_AGE, "maximum password age", (uint32) -1,
  56                 "Maximum password age, in seconds (default: -1 => never expire passwords)",
  57                 "sambaMaxPwdAge" },
  58
  59         {AP_MIN_PASSWORD_AGE,"minimum password age", 0,
  60                 "Minimal password age, in seconds (default: 0 => allow immediate password change)",
  61                 "sambaMinPwdAge" },
  62
  63         {AP_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
  64                 "Lockout duration in minutes (default: 30, -1 => forever)",
  65                 "sambaLockoutDuration" },
  66
  67         {AP_RESET_COUNT_TIME, "reset count minutes", 30,
  68                 "Reset time after lockout in minutes (default: 30)",
  69                 "sambaLockoutObservationWindow" },
  70
  71         {AP_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
  72                 "Lockout users after bad logon attempts (default: 0 => off)",
  73                 "sambaLockoutThreshold" },
  74
  75         {AP_TIME_TO_LOGOUT, "disconnect time", (uint32) -1,
  76                 "Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
  77                 "sambaForceLogoff" },
  78
  79         {AP_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
  80                 "Allow Machine Password changes (default: 0 => off)",
  81                 "sambaRefuseMachinePwdChange" },
  82
  83         {0, NULL, 0, "", NULL}
  84 };
  85
  86 void account_policy_names_list(const char ***names, int *num_names)
  87 {
  88         const char **nl;
  89         int i, count;
  90
  91         for (count=0; account_policy_names[count].string; count++) {
  92         }
  93         nl = SMB_MALLOC_ARRAY(const char *, count);
  94         if (!nl) {
  95                 *num_names = 0;
  96                 return;
  97         }
  98         for (i=0; account_policy_names[i].string; i++) {
  99                 nl[i] = account_policy_names[i].string;
 100         }
 101         *num_names = count;
 102         *names = nl;
 103         return;
 104 }
 105
 106 /****************************************************************************
 107 Get the account policy name as a string from its #define'ed number
 108 ****************************************************************************/
 109
 110 const char *decode_account_policy_name(int field)
 111 {
 112         int i;
 113         for (i=0; account_policy_names[i].string; i++) {
 114                 if (field == account_policy_names[i].field) {
 115                         return account_policy_names[i].string;
 116                 }
 117         }
 118         return NULL;
 119 }
 120
 121 /****************************************************************************
 122 Get the account policy LDAP attribute as a string from its #define'ed number
 123 ****************************************************************************/
 124
 125 const char *get_account_policy_attr(int field)
 126 {
 127         int i;
 128         for (i=0; account_policy_names[i].field; i++) {
 129                 if (field == account_policy_names[i].field) {
 130                         return account_policy_names[i].ldap_attr;
 131                 }
 132         }
 133         return NULL;
 134 }
 135
 136 /****************************************************************************
 137 Get the account policy description as a string from its #define'ed number
 138 ****************************************************************************/
 139
 140 const char *account_policy_get_desc(int field)
 141 {
 142         int i;
 143         for (i=0; account_policy_names[i].string; i++) {
 144                 if (field == account_policy_names[i].field) {
 145                         return account_policy_names[i].description;
 146                 }
 147         }
 148         return NULL;
 149 }
 150
 151 /****************************************************************************
 152 Get the account policy name as a string from its #define'ed number
 153 ****************************************************************************/
 154
 155 int account_policy_name_to_fieldnum(const char *name)
 156 {
 157         int i;
 158         for (i=0; account_policy_names[i].string; i++) {
 159                 if (strcmp(name, account_policy_names[i].string) == 0) {
 160                         return account_policy_names[i].field;
 161                 }
 162         }
 163         return 0;
 164 }
 165
 166 /*****************************************************************************
 167 Get default value for account policy
 168 *****************************************************************************/
 169
 170 BOOL account_policy_get_default(int account_policy, uint32 *val)
 171 {
 172         int i;
 173         for (i=0; account_policy_names[i].field; i++) {
 174                 if (account_policy_names[i].field == account_policy) {
 175                         *val = account_policy_names[i].default_val;
 176                         return True;
 177                 }
 178         }
 179         DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
 180                 account_policy));
 181         return False;
 182 }
 183
 184 /*****************************************************************************
 185  Set default for a field if it is empty
 186 *****************************************************************************/
 187
 188 static BOOL account_policy_set_default_on_empty(int account_policy)
 189 {
 190
 191         uint32 value;
 192
 193         if (!account_policy_get(account_policy, &value) &&
 194             !account_policy_get_default(account_policy, &value)) {
 195                 return False;
 196         }
 197
 198         return account_policy_set(account_policy, value);
 199 }
 200
 201 /*****************************************************************************
 202  Open the account policy tdb.
 203 ***`*************************************************************************/
 204
 205 BOOL init_account_policy(void)
 206 {
 207
 208         const char *vstring = "INFO/version";
 209         uint32 version;
 210         int i;
 211
 212         if (tdb) {
 213                 return True;
 214         }
 215
 216         tdb = tdb_open_log(lock_path("account_policy.tdb"), 0, TDB_DEFAULT, O_RDWR, 0600);
 217         if (!tdb) { /* the account policies files does not exist or open failed, try to create a new one */
 218                 tdb = tdb_open_log(lock_path("account_policy.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
 219                 if (!tdb) {
 220                         DEBUG(0,("Failed to open account policy database\n"));
 221                         return False;
 222                 }
 223         }
 224
 225         /* handle a Samba upgrade */
 226         tdb_lock_bystring(tdb, vstring);
 227         if (!tdb_fetch_uint32(tdb, vstring, &version) || version != DATABASE_VERSION) {
 228
 229                 tdb_store_uint32(tdb, vstring, DATABASE_VERSION);
 230
 231                 for (i=0; account_policy_names[i].field; i++) {
 232
 233                         if (!account_policy_set_default_on_empty(account_policy_names[i].field)) {
 234                                 DEBUG(0,("failed to set default value in account policy tdb\n"));
 235                                 return False;
 236                         }
 237                 }
 238         }
 239
 240         tdb_unlock_bystring(tdb, vstring);
 241
 242         /* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
 243
 244         privilege_create_account( &global_sid_World );
 245         privilege_create_account( &global_sid_Builtin_Account_Operators );
 246         privilege_create_account( &global_sid_Builtin_Server_Operators );
 247         privilege_create_account( &global_sid_Builtin_Print_Operators );
 248         privilege_create_account( &global_sid_Builtin_Backup_Operators );
 249
 250         /* BUILTIN\Administrators get everything -- *always* */
 251
 252         if ( lp_enable_privileges() ) {
 253                 if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
 254                         DEBUG(1,("init_account_policy: Failed to grant privileges "
 255                                 "to BUILTIN\\Administrators!\n"));
 256                 }
 257         }
 258
 259         return True;
 260 }
 261
 262 /*****************************************************************************
 263 Get an account policy (from tdb)
 264 *****************************************************************************/
 265
 266 BOOL account_policy_get(int field, uint32 *value)
 267 {
 268         const char *name;
 269         uint32 regval;
 270
 271         if (!init_account_policy()) {
 272                 return False;
 273         }
 274
 275         if (value) {
 276                 *value = 0;
 277         }
 278
 279         name = decode_account_policy_name(field);
 280         if (name == NULL) {
 281                 DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type!  Cannot get, returning 0.\n", field));
 282                 return False;
 283         }
 284
 285         if (!tdb_fetch_uint32(tdb, name, &regval)) {
 286                 DEBUG(1, ("account_policy_get: tdb_fetch_uint32 failed for field %d (%s), returning 0\n", field, name));
 287                 return False;
 288         }
 289
 290         if (value) {
 291                 *value = regval;
 292         }
 293
 294         DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
 295         return True;
 296 }
 297
 298
 299 /****************************************************************************
 300 Set an account policy (in tdb)
 301 ****************************************************************************/
 302
 303 BOOL account_policy_set(int field, uint32 value)
 304 {
 305         const char *name;
 306
 307         if (!init_account_policy()) {
 308                 return False;
 309         }
 310
 311         name = decode_account_policy_name(field);
 312         if (name == NULL) {
 313                 DEBUG(1, ("Field %d is not a valid account policy type!  Cannot set.\n", field));
 314                 return False;
 315         }
 316
 317         if (!tdb_store_uint32(tdb, name, value)) {
 318                 DEBUG(1, ("tdb_store_uint32 failed for field %d (%s) on value %u\n", field, name, value));
 319                 return False;
 320         }
 321
 322         DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
 323
 324         return True;
 325 }
 326
 327 /****************************************************************************
 328 Set an account policy in the cache
 329 ****************************************************************************/
 330
 331 BOOL cache_account_policy_set(int field, uint32 value)
 332 {
 333         const char *policy_name = NULL;
 334         char *cache_key = NULL;
 335         char *cache_value = NULL;
 336         BOOL ret = False;
 337
 338         policy_name = decode_account_policy_name(field);
 339         if (policy_name == NULL) {
 340                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 341                 return False;
 342         }
 343
 344         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 345                 DEBUG(0, ("asprintf failed\n"));
 346                 goto done;
 347         }
 348
 349         if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
 350                 DEBUG(0, ("asprintf failed\n"));
 351                 goto done;
 352         }
 353
 354         DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
 355
 356         ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
 357
 358  done:
 359         SAFE_FREE(cache_key);
 360         SAFE_FREE(cache_value);
 361         return ret;
 362 }
 363
 364 /*****************************************************************************
 365 Get an account policy from the cache
 366 *****************************************************************************/
 367
 368 BOOL cache_account_policy_get(int field, uint32 *value)
 369 {
 370         const char *policy_name = NULL;
 371         char *cache_key = NULL;
 372         char *cache_value = NULL;
 373         BOOL ret = False;
 374
 375         policy_name = decode_account_policy_name(field);
 376         if (policy_name == NULL) {
 377                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 378                 return False;
 379         }
 380
 381         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 382                 DEBUG(0, ("asprintf failed\n"));
 383                 goto done;
 384         }
 385
 386         if (gencache_get(cache_key, &cache_value, NULL)) {
 387                 uint32 tmp = strtoul(cache_value, NULL, 10);
 388                 *value = tmp;
 389                 ret = True;
 390         }
 391
 392  done:
 393         SAFE_FREE(cache_key);
 394         SAFE_FREE(cache_value);
 395         return ret;
 396 }
 397
 398 /****************************************************************************
 399 ****************************************************************************/
 400
 401 TDB_CONTEXT *get_account_pol_tdb( void )
 402 {
 403
 404         if ( !tdb ) {
 405                 if ( !init_account_policy() ) {
 406                         return NULL;
 407                 }
 408         }
 409
 410         return tdb;
 411 }
 412