source: branches/samba-3.2.x/source/lib/account_pol.c

Last change on this file was 141, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.1
File size: 12.6 KB
Line 
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"
23static struct db_context *db;
24
25/* cache all entries for 60 seconds for to save ldap-queries (cache is updated
26 * after this period if admins do not use pdbedit or usermanager but manipulate
27 * ldap directly) - gd */
28
29#define DATABASE_VERSION 3
30#define AP_TTL 60
31
32
33struct ap_table {
34 int field;
35 const char *string;
36 uint32 default_val;
37 const char *description;
38 const char *ldap_attr;
39};
40
41static const struct ap_table account_policy_names[] = {
42 {AP_MIN_PASSWORD_LEN, "min password length", MINPASSWDLENGTH,
43 "Minimal password length (default: 5)",
44 "sambaMinPwdLength" },
45
46 {AP_PASSWORD_HISTORY, "password history", 0,
47 "Length of Password History Entries (default: 0 => off)",
48 "sambaPwdHistoryLength" },
49
50 {AP_USER_MUST_LOGON_TO_CHG_PASS, "user must logon to change password", 0,
51 "Force Users to logon for password change (default: 0 => off, 2 => on)",
52 "sambaLogonToChgPwd" },
53
54 {AP_MAX_PASSWORD_AGE, "maximum password age", (uint32) -1,
55 "Maximum password age, in seconds (default: -1 => never expire passwords)",
56 "sambaMaxPwdAge" },
57
58 {AP_MIN_PASSWORD_AGE,"minimum password age", 0,
59 "Minimal password age, in seconds (default: 0 => allow immediate password change)",
60 "sambaMinPwdAge" },
61
62 {AP_LOCK_ACCOUNT_DURATION, "lockout duration", 30,
63 "Lockout duration in minutes (default: 30, -1 => forever)",
64 "sambaLockoutDuration" },
65
66 {AP_RESET_COUNT_TIME, "reset count minutes", 30,
67 "Reset time after lockout in minutes (default: 30)",
68 "sambaLockoutObservationWindow" },
69
70 {AP_BAD_ATTEMPT_LOCKOUT, "bad lockout attempt", 0,
71 "Lockout users after bad logon attempts (default: 0 => off)",
72 "sambaLockoutThreshold" },
73
74 {AP_TIME_TO_LOGOUT, "disconnect time", (uint32) -1,
75 "Disconnect Users outside logon hours (default: -1 => off, 0 => on)",
76 "sambaForceLogoff" },
77
78 {AP_REFUSE_MACHINE_PW_CHANGE, "refuse machine password change", 0,
79 "Allow Machine Password changes (default: 0 => off)",
80 "sambaRefuseMachinePwdChange" },
81
82 {0, NULL, 0, "", NULL}
83};
84
85void account_policy_names_list(const char ***names, int *num_names)
86{
87 const char **nl;
88 int i, count;
89
90 for (count=0; account_policy_names[count].string; count++) {
91 }
92 nl = SMB_MALLOC_ARRAY(const char *, count);
93 if (!nl) {
94 *num_names = 0;
95 return;
96 }
97 for (i=0; account_policy_names[i].string; i++) {
98 nl[i] = account_policy_names[i].string;
99 }
100 *num_names = count;
101 *names = nl;
102 return;
103}
104
105/****************************************************************************
106Get the account policy name as a string from its #define'ed number
107****************************************************************************/
108
109const char *decode_account_policy_name(int field)
110{
111 int i;
112 for (i=0; account_policy_names[i].string; i++) {
113 if (field == account_policy_names[i].field) {
114 return account_policy_names[i].string;
115 }
116 }
117 return NULL;
118}
119
120/****************************************************************************
121Get the account policy LDAP attribute as a string from its #define'ed number
122****************************************************************************/
123
124const char *get_account_policy_attr(int field)
125{
126 int i;
127 for (i=0; account_policy_names[i].field; i++) {
128 if (field == account_policy_names[i].field) {
129 return account_policy_names[i].ldap_attr;
130 }
131 }
132 return NULL;
133}
134
135/****************************************************************************
136Get the account policy description as a string from its #define'ed number
137****************************************************************************/
138
139const char *account_policy_get_desc(int field)
140{
141 int i;
142 for (i=0; account_policy_names[i].string; i++) {
143 if (field == account_policy_names[i].field) {
144 return account_policy_names[i].description;
145 }
146 }
147 return NULL;
148}
149
150/****************************************************************************
151Get the account policy name as a string from its #define'ed number
152****************************************************************************/
153
154int account_policy_name_to_fieldnum(const char *name)
155{
156 int i;
157 for (i=0; account_policy_names[i].string; i++) {
158 if (strcmp(name, account_policy_names[i].string) == 0) {
159 return account_policy_names[i].field;
160 }
161 }
162 return 0;
163}
164
165/*****************************************************************************
166Get default value for account policy
167*****************************************************************************/
168
169bool account_policy_get_default(int account_policy, uint32 *val)
170{
171 int i;
172 for (i=0; account_policy_names[i].field; i++) {
173 if (account_policy_names[i].field == account_policy) {
174 *val = account_policy_names[i].default_val;
175 return True;
176 }
177 }
178 DEBUG(0,("no default for account_policy index %d found. This should never happen\n",
179 account_policy));
180 return False;
181}
182
183/*****************************************************************************
184 Set default for a field if it is empty
185*****************************************************************************/
186
187static bool account_policy_set_default_on_empty(int account_policy)
188{
189
190 uint32 value;
191
192 if (!account_policy_get(account_policy, &value) &&
193 !account_policy_get_default(account_policy, &value)) {
194 return False;
195 }
196
197 return account_policy_set(account_policy, value);
198}
199
200/*****************************************************************************
201 Open the account policy tdb.
202***`*************************************************************************/
203
204bool init_account_policy(void)
205{
206
207 const char *vstring = "INFO/version";
208 uint32 version;
209 int i;
210
211 if (db != NULL) {
212 return True;
213 }
214
215 db = db_open_trans(NULL, state_path("account_policy.tdb"), 0, TDB_DEFAULT,
216 O_RDWR, 0600);
217
218 if (db == NULL) { /* the account policies files does not exist or open
219 * failed, try to create a new one */
220 db = db_open_trans(NULL, state_path("account_policy.tdb"), 0,
221 TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
222 if (db == NULL) {
223 DEBUG(0,("Failed to open account policy database\n"));
224 return False;
225 }
226 }
227
228 version = dbwrap_fetch_int32(db, vstring);
229 if (version == DATABASE_VERSION) {
230 return true;
231 }
232
233 /* handle a Samba upgrade */
234
235 if (db->transaction_start(db) != 0) {
236 DEBUG(0, ("transaction_start failed\n"));
237 TALLOC_FREE(db);
238 return false;
239 }
240
241 version = dbwrap_fetch_int32(db, vstring);
242 if (version == DATABASE_VERSION) {
243 /*
244 * Race condition
245 */
246 if (db->transaction_cancel(db)) {
247 smb_panic("transaction_cancel failed");
248 }
249 return true;
250 }
251
252 if (version != DATABASE_VERSION) {
253 if (dbwrap_store_uint32(db, vstring, DATABASE_VERSION) != 0) {
254 DEBUG(0, ("dbwrap_store_uint32 failed\n"));
255 goto cancel;
256 }
257
258 for (i=0; account_policy_names[i].field; i++) {
259
260 if (!account_policy_set_default_on_empty(account_policy_names[i].field)) {
261 DEBUG(0,("failed to set default value in account policy tdb\n"));
262 goto cancel;
263 }
264 }
265 }
266
267 /* These exist by default on NT4 in [HKLM\SECURITY\Policy\Accounts] */
268
269 privilege_create_account( &global_sid_World );
270 privilege_create_account( &global_sid_Builtin_Account_Operators );
271 privilege_create_account( &global_sid_Builtin_Server_Operators );
272 privilege_create_account( &global_sid_Builtin_Print_Operators );
273 privilege_create_account( &global_sid_Builtin_Backup_Operators );
274
275 /* BUILTIN\Administrators get everything -- *always* */
276
277 if ( lp_enable_privileges() ) {
278 if ( !grant_all_privileges( &global_sid_Builtin_Administrators ) ) {
279 DEBUG(1,("init_account_policy: Failed to grant privileges "
280 "to BUILTIN\\Administrators!\n"));
281 }
282 }
283
284 if (db->transaction_commit(db) != 0) {
285 DEBUG(0, ("transaction_commit failed\n"));
286 goto cancel;
287 }
288
289 return True;
290
291 cancel:
292 if (db->transaction_cancel(db)) {
293 smb_panic("transaction_cancel failed");
294 }
295 TALLOC_FREE(db);
296
297 return false;
298}
299
300/*****************************************************************************
301Get an account policy (from tdb)
302*****************************************************************************/
303
304bool account_policy_get(int field, uint32 *value)
305{
306 const char *name;
307 uint32 regval;
308
309 if (!init_account_policy()) {
310 return False;
311 }
312
313 if (value) {
314 *value = 0;
315 }
316
317 name = decode_account_policy_name(field);
318 if (name == NULL) {
319 DEBUG(1, ("account_policy_get: Field %d is not a valid account policy type! Cannot get, returning 0.\n", field));
320 return False;
321 }
322
323 if (!dbwrap_fetch_uint32(db, name, &regval)) {
324 DEBUG(1, ("account_policy_get: tdb_fetch_uint32 failed for field %d (%s), returning 0\n", field, name));
325 return False;
326 }
327
328 if (value) {
329 *value = regval;
330 }
331
332 DEBUG(10,("account_policy_get: name: %s, val: %d\n", name, regval));
333 return True;
334}
335
336
337/****************************************************************************
338Set an account policy (in tdb)
339****************************************************************************/
340
341bool account_policy_set(int field, uint32 value)
342{
343 const char *name;
344 NTSTATUS status;
345
346 if (!init_account_policy()) {
347 return False;
348 }
349
350 name = decode_account_policy_name(field);
351 if (name == NULL) {
352 DEBUG(1, ("Field %d is not a valid account policy type! Cannot set.\n", field));
353 return False;
354 }
355
356 status = dbwrap_trans_store_uint32(db, name, value);
357 if (!NT_STATUS_IS_OK(status)) {
358 DEBUG(1, ("store_uint32 failed for field %d (%s) on value "
359 "%u: %s\n", field, name, value, nt_errstr(status)));
360 return False;
361 }
362
363 DEBUG(10,("account_policy_set: name: %s, value: %d\n", name, value));
364
365 return True;
366}
367
368/****************************************************************************
369Set an account policy in the cache
370****************************************************************************/
371
372bool cache_account_policy_set(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 (asprintf(&cache_value, "%lu\n", (unsigned long)value) < 0) {
391 DEBUG(0, ("asprintf failed\n"));
392 goto done;
393 }
394
395 DEBUG(10,("cache_account_policy_set: updating account pol cache\n"));
396
397 ret = gencache_set(cache_key, cache_value, time(NULL)+AP_TTL);
398
399 done:
400 SAFE_FREE(cache_key);
401 SAFE_FREE(cache_value);
402 return ret;
403}
404
405/*****************************************************************************
406Get an account policy from the cache
407*****************************************************************************/
408
409bool cache_account_policy_get(int field, uint32 *value)
410{
411 const char *policy_name = NULL;
412 char *cache_key = NULL;
413 char *cache_value = NULL;
414 bool ret = False;
415
416 policy_name = decode_account_policy_name(field);
417 if (policy_name == NULL) {
418 DEBUG(0,("cache_account_policy_set: no policy found\n"));
419 return False;
420 }
421
422 if (asprintf(&cache_key, "ACCT_POL/%s", policy_name) < 0) {
423 DEBUG(0, ("asprintf failed\n"));
424 goto done;
425 }
426
427 if (gencache_get(cache_key, &cache_value, NULL)) {
428 uint32 tmp = strtoul(cache_value, NULL, 10);
429 *value = tmp;
430 ret = True;
431 }
432
433 done:
434 SAFE_FREE(cache_key);
435 SAFE_FREE(cache_value);
436 return ret;
437}
438
439/****************************************************************************
440****************************************************************************/
441
442struct db_context *get_account_pol_db( void )
443{
444
445 if ( db == NULL ) {
446 if ( !init_account_policy() ) {
447 return NULL;
448 }
449 }
450
451 return db;
452}
453
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