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/*
* Unix SMB/CIFS implementation.
* account policy storage
* Copyright (C) Jean Franois Micouleau 1998-2001.
* Copyright (C) Andrew Bartlett 2002
* Copyright (C) Guenther Deschner 2004-2005
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
static struct db_context *db;
/* cache all entries for 60 seconds for to save ldap-queries (cache is updated
* after this period if admins do not use pdbedit or usermanager but manipulate
* ldap directly) - gd */
#define DATABASE_VERSION 3
#define AP_TTL 60
struct ap_table {
int field;
const char *string;
uint32 default_val;
const char *description;
const char *ldap_attr;
};
static const struct ap_table account_policy_names[] = {
{AP_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
"Minimal password length (default: 5)",
"sambaMinPwdLength" },
{AP_PASSWORD_HISTORY, "password history", 0,
"Length of Password History Entries (default: 0 => off)",
"sambaPwdHistoryLength" },
{AP_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
"Force Users to logon for password change (default: 0 => off, 2 => on)",
"sambaLogonToChgPwd" },
{AP_MAX_PASSWORD_AGE, "maximum password age", (uint32) -1,
"Maximum password age, in seconds (default: -1 => never expire passwords)",
"sambaMaxPwdAge" },
{AP_MIN_PASSWORD_AGE,"minimum password age", 0,
"Minimal password age, in seconds (default: 0 => allow immediate password change)",
"sambaMinPwdAge" },
{AP_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
"Lockout duration in minutes (default: 30, -1 => forever)",
"sambaLockoutDuration" },
{AP_RESET_COUNT_TIME, "reset count minutes", 30,
"Reset time after lockout in minutes (default: 30)",
"sambaLockoutObservationWindow" },
{AP_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
"Lockout users after bad logon attempts (default: 0 => off)",
"sambaLockoutThreshold" },
{AP_TIME_TO_LOGOUT, "disconnect time", (uint32) -1,
"Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
"sambaForceLogoff" },
{AP_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
"Allow Machine Password changes (default: 0 => off)",
"sambaRefuseMachinePwdChange" },
{0, NULL, 0, "", NULL}
};
void account_policy_names_list(const char ***names, int *num_names)
{
const char **nl;
int i, count;
for (count=0; account_policy_names[count].string; count++) {
}
nl = SMB_MALLOC_ARRAY(const char *, count);
if (!nl) {
*num_names = 0;
return;
}
for (i=0; account_policy_names[i].string; i++) {
nl[i] = account_policy_names[i].string;
}
*num_names = count;
*names = nl;
return;
}
/****************************************************************************
Get the account policy name as a string from its #define'ed number
****************************************************************************/
const char *decode_account_policy_name(int field)
{
int i;
for (i=0; account_policy_names[i].string; i++) {
if (field == account_policy_names[i].field) {
return account_policy_names[i].string;
}
}
return NULL;
}
/****************************************************************************
Get the account policy LDAP attribute as a string from its #define'ed number
****************************************************************************/
const char *get_account_policy_attr(int field)
{
int i;
for (i=0; account_policy_names[i].field; i++) {
if (field == account_policy_names[i].field) {
return account_policy_names[i].ldap_attr;
}
}
return NULL;
}
/****************************************************************************
Get the account policy description as a string from its #define'ed number
****************************************************************************/
const char *account_policy_get_desc(int field)
{
int i;
for (i=0; account_policy_names[i].string; i++) {
if (field == account_policy_names[i].field) {
return account_policy_names[i].description;
}
}
return NULL;
}
/****************************************************************************
Get the account policy name as a string from its #define'ed number
****************************************************************************/
int account_policy_name_to_fieldnum(const char *name)
{
int i;
for (i=0; account_policy_names[i].string; i++) {
if (strcmp(name, account_policy_names[i].string) == 0) {
return account_policy_names[i].field;
}
}
return 0;
}
/*****************************************************************************
Get default value for account policy
*****************************************************************************/
bool account_policy_get_default(int account_policy, uint32 *val)
{
int i;
for (i=0; account_policy_names[i].field; i++) {
if (account_policy_names[i].field == account_policy) {
*val = account_policy_names[i].default_val;
return True;
}
}
DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
account_policy));
return False;
}
/*****************************************************************************
Set default for a field if it is empty
*****************************************************************************/
static bool account_policy_set_default_on_empty(int account_policy)
{
uint32 value;
if (!account_policy_get(account_policy, &value) &&
!account_policy_get_default(account_policy, &value)) {
return False;
}
return account_policy_set(account_policy, value);
}
/*****************************************************************************
Open the account policy tdb.
***`*************************************************************************/
bool init_account_policy(void)
{
const char *vstring = "INFO/version";
uint32 version;
int i;
if (db != NULL) {
return True;
}
db = db_open_trans(NULL, state_path("account_policy.tdb"), 0, TDB_DEFAULT,
O_RDWR, 0600);
if (db == NULL) { /* the account policies files does not exist or open
* failed, try to create a new one */
db = db_open_trans(NULL, state_path("account_policy.tdb"), 0,
TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
if (db == NULL) {
DEBUG(0,("Failed to open account policy database\n"));
return False;
}
}
version = dbwrap_fetch_int32(db, vstring);
if (version == DATABASE_VERSION) {
return true;
}
/* handle a Samba upgrade */
if (db->transaction_start(db) != 0) {
DEBUG(0, ("transaction_start failed\n"));
TALLOC_FREE(db);
return false;
}
version = dbwrap_fetch_int32(db, vstring);
if (version == DATABASE_VERSION) {
/*
* Race condition
*/
if (db->transaction_cancel(db)) {
smb_panic("transaction_cancel failed");
}
return true;
}
if (version != DATABASE_VERSION) {
if (dbwrap_store_uint32(db, vstring, DATABASE_VERSION) != 0) {
DEBUG(0, ("dbwrap_store_uint32 failed\n"));
goto cancel;
}
for (i=0; account_policy_names[i].field; i++) {
if (!account_policy_set_default_on_empty(account_policy_names[i].field)) {
DEBUG(0,("failed to set default value in account policy tdb\n"));
goto cancel;
}
}
}
/* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
privilege_create_account( &global_sid_World );
privilege_create_account( &global_sid_Builtin_Account_Operators );
privilege_create_account( &global_sid_Builtin_Server_Operators );
privilege_create_account( &global_sid_Builtin_Print_Operators );
privilege_create_account( &global_sid_Builtin_Backup_Operators );
/* BUILTIN\Administrators get everything -- *always* */
if ( lp_enable_privileges() ) {
if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
DEBUG(1,("init_account_policy: Failed to grant privileges "
"to BUILTIN\\Administrators!\n"));
}
}
if (db->transaction_commit(db) != 0) {
DEBUG(0, ("transaction_commit failed\n"));
goto cancel;
}
return True;
cancel:
if (db->transaction_cancel(db)) {
smb_panic("transaction_cancel failed");
}
TALLOC_FREE(db);
return false;
}
/*****************************************************************************
Get an account policy (from tdb)
*****************************************************************************/
bool account_policy_get(int field, uint32 *value)
{
const char *name;
uint32 regval;
if (!init_account_policy()) {
return False;
}
if (value) {
*value = 0;
}
name = decode_account_policy_name(field);
if (name == NULL) {
DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type! Cannot get, returning 0.\n", field));
return False;
}
if (!dbwrap_fetch_uint32(db, name, ®val)) {
DEBUG(1, ("account_policy_get: tdb_fetch_uint32 failed for field %d (%s), returning 0\n", field, name));
return False;
}
if (value) {
*value = regval;
}
DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
return True;
}
/****************************************************************************
Set an account policy (in tdb)
****************************************************************************/
bool account_policy_set(int field, uint32 value)
{
const char *name;
NTSTATUS status;
if (!init_account_policy()) {
return False;
}
name = decode_account_policy_name(field);
if (name == NULL) {
DEBUG(1, ("Field %d is not a valid account policy type! Cannot set.\n", field));
return False;
}
status = dbwrap_trans_store_uint32(db, name, value);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("store_uint32 failed for field %d (%s) on value "
"%u: %s\n", field, name, value, nt_errstr(status)));
return False;
}
DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
return True;
}
/****************************************************************************
Set an account policy in the cache
****************************************************************************/
bool cache_account_policy_set(int field, uint32 value)
{
const char *policy_name = NULL;
char *cache_key = NULL;
char *cache_value = NULL;
bool ret = False;
policy_name = decode_account_policy_name(field);
if (policy_name == NULL) {
DEBUG(0,("cache_account_policy_set: no policy found\n"));
return False;
}
if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
DEBUG(0, ("asprintf failed\n"));
goto done;
}
if (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
DEBUG(0, ("asprintf failed\n"));
goto done;
}
DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
done:
SAFE_FREE(cache_key);
SAFE_FREE(cache_value);
return ret;
}
/*****************************************************************************
Get an account policy from the cache
*****************************************************************************/
bool cache_account_policy_get(int field, uint32 *value)
{
const char *policy_name = NULL;
char *cache_key = NULL;
char *cache_value = NULL;
bool ret = False;
policy_name = decode_account_policy_name(field);
if (policy_name == NULL) {
DEBUG(0,("cache_account_policy_set: no policy found\n"));
return False;
}
if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
DEBUG(0, ("asprintf failed\n"));
goto done;
}
if (gencache_get(cache_key, &cache_value, NULL)) {
uint32 tmp = strtoul(cache_value, NULL, 10);
*value = tmp;
ret = True;
}
done:
SAFE_FREE(cache_key);
SAFE_FREE(cache_value);
return ret;
}
/****************************************************************************
****************************************************************************/
struct db_context *get_account_pol_db( void )
{
if ( db == NULL ) {
if ( !init_account_policy() ) {
return NULL;
}
}
return db;
}
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