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s3-passdb: make priv2ld() public
[Samba.git] / source3 / auth / check_samsec.c
blob299f43a1e995c95e5c61e1fe1857b497d5eb32e5
1 /*
2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Tridgell 1992-2000
5 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
6 Copyright (C) Andrew Bartlett 2001-2003
7 Copyright (C) Gerald Carter 2003
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "../libcli/auth/libcli_auth.h"
25
26 #undef DBGC_CLASS
27 #define DBGC_CLASS DBGC_AUTH
28
29 /****************************************************************************
30 Do a specific test for an smb password being correct, given a smb_password and
31 the lanman and NT responses.
32 ****************************************************************************/
33
34 static NTSTATUS sam_password_ok(TALLOC_CTX *mem_ctx,
35 const char *username,
36 uint32_t acct_ctrl,
37 const DATA_BLOB *challenge,
38 const uint8_t *lm_pw,
39 const uint8_t *nt_pw,
40 const struct auth_usersupplied_info *user_info,
41 DATA_BLOB *user_sess_key,
42 DATA_BLOB *lm_sess_key)
43 {
44 NTSTATUS status;
45 struct samr_Password _lm_hash, _nt_hash;
46 struct samr_Password *lm_hash = NULL;
47 struct samr_Password *nt_hash = NULL;
48
49 *user_sess_key = data_blob_null;
50 *lm_sess_key = data_blob_null;
51
52 if (acct_ctrl & ACB_PWNOTREQ) {
53 if (lp_null_passwords()) {
54 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
55 return NT_STATUS_OK;
56 } else {
57 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
58 return NT_STATUS_LOGON_FAILURE;
59 }
60 }
61
62 if (lm_pw) {
63 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
64 lm_hash = &_lm_hash;
65 }
66 if (nt_pw) {
67 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
68 nt_hash = &_nt_hash;
69 }
70 switch (user_info->password_state) {
71 case AUTH_PASSWORD_HASH:
72 status = hash_password_check(mem_ctx, lp_lanman_auth(),
73 user_info->password.hash.lanman,
74 user_info->password.hash.nt,
75 username,
76 lm_hash,
77 nt_hash);
78 if (NT_STATUS_IS_OK(status)) {
79 if (nt_pw) {
80 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
81 if (!user_sess_key->data) {
82 return NT_STATUS_NO_MEMORY;
83 }
84 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
85 }
86 }
87 return status;
88
89 /* Eventually we should test plaintext passwords in their own
90 * function, not assuming the caller has done a
91 * mapping */
92 case AUTH_PASSWORD_PLAIN:
93 case AUTH_PASSWORD_RESPONSE:
94 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
95 lp_ntlm_auth(),
96 user_info->logon_parameters,
97 challenge,
98 &user_info->password.response.lanman, &user_info->password.response.nt,
99 username,
100 user_info->client.account_name,
101 user_info->client.domain_name,
102 lm_hash,
103 nt_hash,
104 user_sess_key, lm_sess_key);
105 default:
106 DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n", username, user_info->password_state));
107 return NT_STATUS_INTERNAL_ERROR;
108 }
109 }
110
111 /****************************************************************************
112 Check if a user is allowed to logon at this time. Note this is the
113 servers local time, as logon hours are just specified as a weekly
114 bitmask.
115 ****************************************************************************/
116
117 static bool logon_hours_ok(struct samu *sampass)
118 {
119 /* In logon hours first bit is Sunday from 12AM to 1AM */
120 const uint8 *hours;
121 struct tm *utctime;
122 time_t lasttime;
123 const char *asct;
124 uint8 bitmask, bitpos;
125
126 hours = pdb_get_hours(sampass);
127 if (!hours) {
128 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
129 return True;
130 }
131
132 lasttime = time(NULL);
133 utctime = gmtime(&lasttime);
134 if (!utctime) {
135 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
136 pdb_get_username(sampass) ));
137 return False;
138 }
139
140 /* find the corresponding byte and bit */
141 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
142 bitmask = 1 << (bitpos % 8);
143
144 if (! (hours[bitpos/8] & bitmask)) {
145 struct tm *t = localtime(&lasttime);
146 if (!t) {
147 asct = "INVALID TIME";
148 } else {
149 asct = asctime(t);
150 if (!asct) {
151 asct = "INVALID TIME";
152 }
153 }
154
155 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
156 "logon at this time (%s).\n",
157 pdb_get_username(sampass), asct ));
158 return False;
159 }
160
161 asct = asctime(utctime);
162 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
163 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
164
165 return True;
166 }
167
168 /****************************************************************************
169 Do a specific test for a struct samu being valid for this connection
170 (ie not disabled, expired and the like).
171 ****************************************************************************/
172
173 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
174 struct samu *sampass,
175 const struct auth_usersupplied_info *user_info)
176 {
177 uint32 acct_ctrl = pdb_get_acct_ctrl(sampass);
178 char *workstation_list;
179 time_t kickoff_time;
180
181 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
182
183 /* Quit if the account was disabled. */
184 if (acct_ctrl & ACB_DISABLED) {
185 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
186 return NT_STATUS_ACCOUNT_DISABLED;
187 }
188
189 /* Quit if the account was locked out. */
190 if (acct_ctrl & ACB_AUTOLOCK) {
191 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
192 return NT_STATUS_ACCOUNT_LOCKED_OUT;
193 }
194
195 /* Quit if the account is not allowed to logon at this time. */
196 if (! logon_hours_ok(sampass)) {
197 return NT_STATUS_INVALID_LOGON_HOURS;
198 }
199
200 /* Test account expire time */
201
202 kickoff_time = pdb_get_kickoff_time(sampass);
203 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
204 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
205 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
206 return NT_STATUS_ACCOUNT_EXPIRED;
207 }
208
209 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
210 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
211 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
212
213 /* check for immediate expiry "must change at next logon"
214 * for a user account. */
215 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
216 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
217 return NT_STATUS_PASSWORD_MUST_CHANGE;
218 }
219
220 /* check for expired password */
221 if (must_change_time < time(NULL) && must_change_time != 0) {
222 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
223 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
224 return NT_STATUS_PASSWORD_EXPIRED;
225 }
226 }
227
228 /* Test workstation. Workstation list is comma separated. */
229
230 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
231 if (!workstation_list)
232 return NT_STATUS_NO_MEMORY;
233
234 if (*workstation_list) {
235 bool invalid_ws = True;
236 char *tok = NULL;
237 const char *s = workstation_list;
238 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->workstation_name);
239
240 if (machine_name == NULL)
241 return NT_STATUS_NO_MEMORY;
242
243 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
244 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
245 tok, user_info->workstation_name));
246 if(strequal(tok, user_info->workstation_name)) {
247 invalid_ws = False;
248 break;
249 }
250 if (tok[0] == '+') {
251 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
252 machine_name, tok + 1));
253 if (user_in_group(machine_name, tok + 1)) {
254 invalid_ws = False;
255 break;
256 }
257 }
258 TALLOC_FREE(tok);
259 }
260 TALLOC_FREE(tok);
261 TALLOC_FREE(machine_name);
262
263 if (invalid_ws)
264 return NT_STATUS_INVALID_WORKSTATION;
265 }
266
267 if (acct_ctrl & ACB_DOMTRUST) {
268 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
269 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
270 }
271
272 if (acct_ctrl & ACB_SVRTRUST) {
273 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
274 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
275 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
276 }
277 }
278
279 if (acct_ctrl & ACB_WSTRUST) {
280 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
281 DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
282 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
283 }
284 }
285 return NT_STATUS_OK;
286 }
287
288 /**
289 * Check whether the given password is one of the last two
290 * password history entries. If so, the bad pwcount should
291 * not be incremented even thought the actual password check
292 * failed.
293 */
294 static bool need_to_increment_bad_pw_count(
295 const DATA_BLOB *challenge,
296 struct samu* sampass,
297 const struct auth_usersupplied_info *user_info)
298 {
299 uint8_t i;
300 const uint8_t *pwhistory;
301 uint32_t pwhistory_len;
302 uint32_t policy_pwhistory_len;
303 uint32_t acct_ctrl;
304 const char *username;
305 TALLOC_CTX *mem_ctx = talloc_stackframe();
306 bool result = true;
307
308 pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY,
309 &policy_pwhistory_len);
310 if (policy_pwhistory_len == 0) {
311 goto done;
312 }
313
314 pwhistory = pdb_get_pw_history(sampass, &pwhistory_len);
315 if (!pwhistory || pwhistory_len == 0) {
316 goto done;
317 }
318
319 acct_ctrl = pdb_get_acct_ctrl(sampass);
320 username = pdb_get_username(sampass);
321
322 for (i=1; i < MIN(MIN(3, policy_pwhistory_len), pwhistory_len); i++) {
323 static const uint8_t zero16[SALTED_MD5_HASH_LEN];
324 const uint8_t *salt;
325 const uint8_t *nt_pw;
326 NTSTATUS status;
327 DATA_BLOB user_sess_key = data_blob_null;
328 DATA_BLOB lm_sess_key = data_blob_null;
329
330 salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
331 nt_pw = salt + PW_HISTORY_SALT_LEN;
332
333 if (memcmp(zero16, nt_pw, NT_HASH_LEN) == 0) {
334 /* skip zero password hash */
335 continue;
336 }
337
338 if (memcmp(zero16, salt, PW_HISTORY_SALT_LEN) != 0) {
339 /* skip nonzero salt (old format entry) */
340 continue;
341 }
342
343 status = sam_password_ok(mem_ctx,
344 username, acct_ctrl,
345 challenge,
346 NULL, nt_pw,
347 user_info, &user_sess_key, &lm_sess_key);
348 if (NT_STATUS_IS_OK(status)) {
349 result = false;
350 break;
351 }
352 }
353
354 done:
355 TALLOC_FREE(mem_ctx);
356 return result;
357 }
358
359 /****************************************************************************
360 check if a username/password is OK assuming the password is a 24 byte
361 SMB hash supplied in the user_info structure
362 return an NT_STATUS constant.
363 ****************************************************************************/
364
365 NTSTATUS check_sam_security(const DATA_BLOB *challenge,
366 TALLOC_CTX *mem_ctx,
367 const struct auth_usersupplied_info *user_info,
368 struct auth_serversupplied_info **server_info)
369 {
370 struct samu *sampass=NULL;
371 bool ret;
372 NTSTATUS nt_status;
373 NTSTATUS update_login_attempts_status;
374 DATA_BLOB user_sess_key = data_blob_null;
375 DATA_BLOB lm_sess_key = data_blob_null;
376 bool updated_badpw = False;
377 const char *username;
378 const uint8_t *nt_pw;
379 const uint8_t *lm_pw;
380
381 /* the returned struct gets kept on the server_info, by means
382 of a steal further down */
383
384 sampass = samu_new(mem_ctx);
385 if (sampass == NULL) {
386 return NT_STATUS_NO_MEMORY;
387 }
388
389 /* get the account information */
390
391 become_root();
392 ret = pdb_getsampwnam(sampass, user_info->mapped.account_name);
393 unbecome_root();
394
395 if (ret == False) {
396 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
397 "passdb.\n", user_info->mapped.account_name));
398 TALLOC_FREE(sampass);
399 return NT_STATUS_NO_SUCH_USER;
400 }
401
402 username = pdb_get_username(sampass);
403 nt_pw = pdb_get_nt_passwd(sampass);
404 lm_pw = pdb_get_lanman_passwd(sampass);
405
406 /* Quit if the account was locked out. */
407 if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
408 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username));
409 return NT_STATUS_ACCOUNT_LOCKED_OUT;
410 }
411
412 nt_status = sam_password_ok(mem_ctx,
413 username, pdb_get_acct_ctrl(sampass),
414 challenge, lm_pw, nt_pw,
415 user_info, &user_sess_key, &lm_sess_key);
416
417 /* Notify passdb backend of login success/failure. If not
418 NT_STATUS_OK the backend doesn't like the login */
419
420 update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
421
422 if (!NT_STATUS_IS_OK(nt_status)) {
423 bool increment_bad_pw_count = false;
424
425 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
426 pdb_get_acct_ctrl(sampass) & ACB_NORMAL &&
427 NT_STATUS_IS_OK(update_login_attempts_status))
428 {
429 increment_bad_pw_count =
430 need_to_increment_bad_pw_count(
431 challenge, sampass, user_info);
432 }
433
434 if (increment_bad_pw_count) {
435 pdb_increment_bad_password_count(sampass);
436 updated_badpw = True;
437 } else {
438 pdb_update_bad_password_count(sampass,
439 &updated_badpw);
440 }
441 if (updated_badpw){
442 NTSTATUS status;
443
444 become_root();
445 status = pdb_update_sam_account(sampass);
446 unbecome_root();
447
448 if (!NT_STATUS_IS_OK(status)) {
449 DEBUG(1, ("Failed to modify entry: %s\n",
450 nt_errstr(status)));
451 }
452 }
453 goto done;
454 }
455
456 if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
457 (pdb_get_bad_password_count(sampass) > 0)){
458 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
459 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
460 updated_badpw = True;
461 }
462
463 if (updated_badpw){
464 NTSTATUS status;
465
466 become_root();
467 status = pdb_update_sam_account(sampass);
468 unbecome_root();
469
470 if (!NT_STATUS_IS_OK(status)) {
471 DEBUG(1, ("Failed to modify entry: %s\n",
472 nt_errstr(status)));
473 }
474 }
475
476 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
477
478 if (!NT_STATUS_IS_OK(nt_status)) {
479 goto done;
480 }
481
482 become_root();
483 nt_status = make_server_info_sam(server_info, sampass);
484 unbecome_root();
485
486 TALLOC_FREE(sampass);
487
488 if (!NT_STATUS_IS_OK(nt_status)) {
489 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
490 goto done;
491 }
492
493 (*server_info)->user_session_key =
494 data_blob_talloc(*server_info, user_sess_key.data,
495 user_sess_key.length);
496 data_blob_free(&user_sess_key);
497
498 (*server_info)->lm_session_key =
499 data_blob_talloc(*server_info, lm_sess_key.data,
500 lm_sess_key.length);
501 data_blob_free(&lm_sess_key);
502
503 (*server_info)->nss_token |= user_info->was_mapped;
504
505 done:
506 TALLOC_FREE(sampass);
507 data_blob_free(&user_sess_key);
508 data_blob_free(&lm_sess_key);
509 return nt_status;
510 }
511
512 /* This helper function for winbindd returns a very similar value to
513 * what a NETLOGON call would give, without the indirection */
514 NTSTATUS check_sam_security_info3(const DATA_BLOB *challenge,
515 TALLOC_CTX *mem_ctx,
516 const struct auth_usersupplied_info *user_info,
517 struct netr_SamInfo3 **pinfo3)
518 {
519 struct auth_serversupplied_info *server_info = NULL;
520 struct netr_SamInfo3 *info3;
521 NTSTATUS status;
522 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
523 if (!tmp_ctx) {
524 return NT_STATUS_NO_MEMORY;
525 }
526 status = check_sam_security(challenge, tmp_ctx, user_info, &server_info);
527 if (!NT_STATUS_IS_OK(status)) {
528 DEBUG(10, ("check_sam_security failed: %s\n",
529 nt_errstr(status)));
530 return status;
531 }
532
533 info3 = TALLOC_ZERO_P(mem_ctx, struct netr_SamInfo3);
534 if (info3 == NULL) {
535 talloc_free(tmp_ctx);
536 return NT_STATUS_NO_MEMORY;
537 }
538
539 status = serverinfo_to_SamInfo3(server_info, NULL, 0, info3);
540 if (!NT_STATUS_IS_OK(status)) {
541 DEBUG(10, ("serverinfo_to_SamInfo3 failed: %s\n",
542 nt_errstr(status)));
543 return status;
544 }
545 *pinfo3 = info3;
546 return NT_STATUS_OK;
547 }
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