source: vendor/current/source3/passdb/account_pol.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 13.1 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"
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
30static 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
40struct 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
48static 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
92void 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/****************************************************************************
112Get the account policy name as a string from its #define'ed number
113****************************************************************************/
114
115const 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/****************************************************************************
127Get the account policy LDAP attribute as a string from its #define'ed number
128****************************************************************************/
129
130const 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/****************************************************************************
142Get the account policy description as a string from its #define'ed number
143****************************************************************************/
144
145const 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/****************************************************************************
157Get the account policy name as a string from its #define'ed number
158****************************************************************************/
159
160enum 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/*****************************************************************************
172Get default value for account policy
173*****************************************************************************/
174
175bool 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
193static 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
210bool 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/*****************************************************************************
329Get an account policy (from tdb)
330*****************************************************************************/
331
332bool 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/****************************************************************************
368Set an account policy (in tdb)
369****************************************************************************/
370
371bool 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/****************************************************************************
399Set an account policy in the cache
400****************************************************************************/
401
402bool 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/*****************************************************************************
436Get an account policy from the cache
437*****************************************************************************/
438
439bool 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
472struct 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}
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