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 2 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 char *account_policy_names_list(void)
  87 {
  88         char *nl, *p;
  89         int i;
  90         size_t len = 0;
  91
  92         for (i=0; account_policy_names[i].string; i++) {
  93                 len += strlen(account_policy_names[i].string) + 1;
  94         }
  95         len++;
  96         nl = (char *)SMB_MALLOC(len);
  97         if (!nl) {
  98                 return NULL;
  99         }
 100         p = nl;
 101         for (i=0; account_policy_names[i].string; i++) {
 102                 memcpy(p, account_policy_names[i].string, strlen(account_policy_names[i].string) + 1);
 103                 p[strlen(account_policy_names[i].string)] = '\n';
 104                 p += strlen(account_policy_names[i].string) + 1;
 105         }
 106         *p = '\0';
 107         return nl;
 108 }
 109
 110 /****************************************************************************
 111 Get the account policy name as a string from its #define'ed number
 112 ****************************************************************************/
 113
 114 const char *decode_account_policy_name(int field)
 115 {
 116         int i;
 117         for (i=0; account_policy_names[i].string; i++) {
 118                 if (field == account_policy_names[i].field) {
 119                         return account_policy_names[i].string;
 120                 }
 121         }
 122         return NULL;
 123 }
 124
 125 /****************************************************************************
 126 Get the account policy LDAP attribute as a string from its #define'ed number
 127 ****************************************************************************/
 128
 129 const char *get_account_policy_attr(int field)
 130 {
 131         int i;
 132         for (i=0; account_policy_names[i].field; i++) {
 133                 if (field == account_policy_names[i].field) {
 134                         return account_policy_names[i].ldap_attr;
 135                 }
 136         }
 137         return NULL;
 138 }
 139
 140 /****************************************************************************
 141 Get the account policy description as a string from its #define'ed number
 142 ****************************************************************************/
 143
 144 const char *account_policy_get_desc(int field)
 145 {
 146         int i;
 147         for (i=0; account_policy_names[i].string; i++) {
 148                 if (field == account_policy_names[i].field) {
 149                         return account_policy_names[i].description;
 150                 }
 151         }
 152         return NULL;
 153 }
 154
 155 /****************************************************************************
 156 Get the account policy name as a string from its #define'ed number
 157 ****************************************************************************/
 158
 159 int account_policy_name_to_fieldnum(const char *name)
 160 {
 161         int i;
 162         for (i=0; account_policy_names[i].string; i++) {
 163                 if (strcmp(name, account_policy_names[i].string) == 0) {
 164                         return account_policy_names[i].field;
 165                 }
 166         }
 167         return 0;
 168 }
 169
 170 /*****************************************************************************
 171 Get default value for account policy
 172 *****************************************************************************/
 173
 174 BOOL account_policy_get_default(int account_policy, uint32 *val)
 175 {
 176         int i;
 177         for (i=0; account_policy_names[i].field; i++) {
 178                 if (account_policy_names[i].field == account_policy) {
 179                         *val = account_policy_names[i].default_val;
 180                         return True;
 181                 }
 182         }
 183         DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
 184                 account_policy));
 185         return False;
 186 }
 187
 188 /*****************************************************************************
 189  Set default for a field if it is empty
 190 *****************************************************************************/
 191
 192 static BOOL account_policy_set_default_on_empty(int account_policy)
 193 {
 194
 195         uint32 value;
 196
 197         if (!account_policy_get(account_policy, &value) &&
 198             !account_policy_get_default(account_policy, &value)) {
 199                 return False;
 200         }
 201
 202         return account_policy_set(account_policy, value);
 203 }
 204
 205 /*****************************************************************************
 206  Open the account policy tdb.
 207 ***`*************************************************************************/
 208
 209 BOOL init_account_policy(void)
 210 {
 211
 212         const char *vstring = "INFO/version";
 213         uint32 version;
 214         int i;
 215
 216         if (tdb) {
 217                 return True;
 218         }
 219
 220         tdb = tdb_open_log(lock_path("account_policy.tdb"), 0, TDB_DEFAULT, O_RDWR, 0600);
 221         if (!tdb) { /* the account policies files does not exist or open failed, try to create a new one */
 222                 tdb = tdb_open_log(lock_path("account_policy.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
 223                 if (!tdb) {
 224                         DEBUG(0,("Failed to open account policy database\n"));
 225                         return False;
 226                 }
 227         }
 228
 229         /* handle a Samba upgrade */
 230         tdb_lock_bystring(tdb, vstring);
 231         if (!tdb_fetch_uint32(tdb, vstring, &version) || version != DATABASE_VERSION) {
 232
 233                 tdb_store_uint32(tdb, vstring, DATABASE_VERSION);
 234
 235                 for (i=0; account_policy_names[i].field; i++) {
 236
 237                         if (!account_policy_set_default_on_empty(account_policy_names[i].field)) {
 238                                 DEBUG(0,("failed to set default value in account policy tdb\n"));
 239                                 return False;
 240                         }
 241                 }
 242         }
 243
 244         tdb_unlock_bystring(tdb, vstring);
 245
 246         /* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
 247
 248         privilege_create_account( &global_sid_World );
 249         privilege_create_account( &global_sid_Builtin_Account_Operators );
 250         privilege_create_account( &global_sid_Builtin_Server_Operators );
 251         privilege_create_account( &global_sid_Builtin_Print_Operators );
 252         privilege_create_account( &global_sid_Builtin_Backup_Operators );
 253
 254         /* BUILTIN\Administrators get everything -- *always* */
 255
 256         if ( lp_enable_privileges() ) {
 257                 if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
 258                         DEBUG(1,("init_account_policy: Failed to grant privileges "
 259                                 "to BUILTIN\\Administrators!\n"));
 260                 }
 261         }
 262
 263         return True;
 264 }
 265
 266 /*****************************************************************************
 267 Get an account policy (from tdb)
 268 *****************************************************************************/
 269
 270 BOOL account_policy_get(int field, uint32 *value)
 271 {
 272         const char *name;
 273         uint32 regval;
 274
 275         if (!init_account_policy()) {
 276                 return False;
 277         }
 278
 279         if (value) {
 280                 *value = 0;
 281         }
 282
 283         name = decode_account_policy_name(field);
 284         if (name == NULL) {
 285                 DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type!  Cannot get, returning 0.\n", field));
 286                 return False;
 287         }
 288
 289         if (!tdb_fetch_uint32(tdb, name, &regval)) {
 290                 DEBUG(1, ("account_policy_get: tdb_fetch_uint32 failed for field %d (%s), returning 0\n", field, name));
 291                 return False;
 292         }
 293
 294         if (value) {
 295                 *value = regval;
 296         }
 297
 298         DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
 299         return True;
 300 }
 301
 302
 303 /****************************************************************************
 304 Set an account policy (in tdb)
 305 ****************************************************************************/
 306
 307 BOOL account_policy_set(int field, uint32 value)
 308 {
 309         const char *name;
 310
 311         if (!init_account_policy()) {
 312                 return False;
 313         }
 314
 315         name = decode_account_policy_name(field);
 316         if (name == NULL) {
 317                 DEBUG(1, ("Field %d is not a valid account policy type!  Cannot set.\n", field));
 318                 return False;
 319         }
 320
 321         if (!tdb_store_uint32(tdb, name, value)) {
 322                 DEBUG(1, ("tdb_store_uint32 failed for field %d (%s) on value %u\n", field, name, value));
 323                 return False;
 324         }
 325
 326         DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
 327
 328         return True;
 329 }
 330
 331 /****************************************************************************
 332 Set an account policy in the cache
 333 ****************************************************************************/
 334
 335 BOOL cache_account_policy_set(int field, uint32 value)
 336 {
 337         const char *policy_name = NULL;
 338         char *cache_key = NULL;
 339         char *cache_value = NULL;
 340         BOOL ret = False;
 341
 342         policy_name = decode_account_policy_name(field);
 343         if (policy_name == NULL) {
 344                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 345                 return False;
 346         }
 347
 348         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 349                 DEBUG(0, ("asprintf failed\n"));
 350                 goto done;
 351         }
 352
 353         if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
 354                 DEBUG(0, ("asprintf failed\n"));
 355                 goto done;
 356         }
 357
 358         DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
 359
 360         ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
 361
 362  done:
 363         SAFE_FREE(cache_key);
 364         SAFE_FREE(cache_value);
 365         return ret;
 366 }
 367
 368 /*****************************************************************************
 369 Get an account policy from the cache
 370 *****************************************************************************/
 371
 372 BOOL cache_account_policy_get(int field, uint32 *value)
 373 {
 374         const char *policy_name = NULL;
 375         char *cache_key = NULL;
 376         char *cache_value = NULL;
 377         BOOL ret = False;
 378
 379         policy_name = decode_account_policy_name(field);
 380         if (policy_name == NULL) {
 381                 DEBUG(0,("cache_account_policy_set: no policy found\n"));
 382                 return False;
 383         }
 384
 385         if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
 386                 DEBUG(0, ("asprintf failed\n"));
 387                 goto done;
 388         }
 389
 390         if (gencache_get(cache_key, &cache_value, NULL)) {
 391                 uint32 tmp = strtoul(cache_value, NULL, 10);
 392                 *value = tmp;
 393                 ret = True;
 394         }
 395
 396  done:
 397         SAFE_FREE(cache_key);
 398         SAFE_FREE(cache_value);
 399         return ret;
 400 }
 401
 402 /****************************************************************************
 403 ****************************************************************************/
 404
 405 TDB_CONTEXT *get_account_pol_tdb( void )
 406 {
 407
 408         if ( !tdb ) {
 409                 if ( !init_account_policy() ) {
 410                         return NULL;
 411                 }
 412         }
 413
 414         return tdb;
 415 }
 416