source: trunk/server/source3/auth/check_samsec.c@ 845

Last change on this file since 845 was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 16.6 KB
Line 
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 "auth.h"
25#include "../libcli/auth/libcli_auth.h"
26#include "passdb.h"
27
28#undef DBGC_CLASS
29#define DBGC_CLASS DBGC_AUTH
30
31/****************************************************************************
32 Do a specific test for an smb password being correct, given a smb_password and
33 the lanman and NT responses.
34****************************************************************************/
35
36static NTSTATUS sam_password_ok(TALLOC_CTX *mem_ctx,
37 const char *username,
38 uint32_t acct_ctrl,
39 const DATA_BLOB *challenge,
40 const uint8_t *lm_pw,
41 const uint8_t *nt_pw,
42 const struct auth_usersupplied_info *user_info,
43 DATA_BLOB *user_sess_key,
44 DATA_BLOB *lm_sess_key)
45{
46 NTSTATUS status;
47 struct samr_Password _lm_hash, _nt_hash;
48 struct samr_Password *lm_hash = NULL;
49 struct samr_Password *nt_hash = NULL;
50
51 *user_sess_key = data_blob_null;
52 *lm_sess_key = data_blob_null;
53
54 if (acct_ctrl & ACB_PWNOTREQ) {
55 if (lp_null_passwords()) {
56 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
57 return NT_STATUS_OK;
58 } else {
59 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
60 return NT_STATUS_LOGON_FAILURE;
61 }
62 }
63
64 if (lm_pw) {
65 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
66 lm_hash = &_lm_hash;
67 }
68 if (nt_pw) {
69 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
70 nt_hash = &_nt_hash;
71 }
72 switch (user_info->password_state) {
73 case AUTH_PASSWORD_HASH:
74 status = hash_password_check(mem_ctx, lp_lanman_auth(),
75 user_info->password.hash.lanman,
76 user_info->password.hash.nt,
77 username,
78 lm_hash,
79 nt_hash);
80 if (NT_STATUS_IS_OK(status)) {
81 if (nt_pw) {
82 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
83 if (!user_sess_key->data) {
84 return NT_STATUS_NO_MEMORY;
85 }
86 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
87 }
88 }
89 return status;
90
91 /* Eventually we should test plaintext passwords in their own
92 * function, not assuming the caller has done a
93 * mapping */
94 case AUTH_PASSWORD_PLAIN:
95 case AUTH_PASSWORD_RESPONSE:
96 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
97 lp_ntlm_auth(),
98 user_info->logon_parameters,
99 challenge,
100 &user_info->password.response.lanman, &user_info->password.response.nt,
101 username,
102 user_info->client.account_name,
103 user_info->client.domain_name,
104 lm_hash,
105 nt_hash,
106 user_sess_key, lm_sess_key);
107 default:
108 DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n", username, user_info->password_state));
109 return NT_STATUS_INTERNAL_ERROR;
110 }
111}
112
113/****************************************************************************
114 Check if a user is allowed to logon at this time. Note this is the
115 servers local time, as logon hours are just specified as a weekly
116 bitmask.
117****************************************************************************/
118
119static bool logon_hours_ok(struct samu *sampass)
120{
121 /* In logon hours first bit is Sunday from 12AM to 1AM */
122 const uint8 *hours;
123 struct tm *utctime;
124 time_t lasttime;
125 const char *asct;
126 uint8 bitmask, bitpos;
127
128 hours = pdb_get_hours(sampass);
129 if (!hours) {
130 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
131 return True;
132 }
133
134 lasttime = time(NULL);
135 utctime = gmtime(&lasttime);
136 if (!utctime) {
137 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
138 pdb_get_username(sampass) ));
139 return False;
140 }
141
142 /* find the corresponding byte and bit */
143 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
144 bitmask = 1 << (bitpos % 8);
145
146 if (! (hours[bitpos/8] & bitmask)) {
147 struct tm *t = localtime(&lasttime);
148 if (!t) {
149 asct = "INVALID TIME";
150 } else {
151 asct = asctime(t);
152 if (!asct) {
153 asct = "INVALID TIME";
154 }
155 }
156
157 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
158 "logon at this time (%s).\n",
159 pdb_get_username(sampass), asct ));
160 return False;
161 }
162
163 asct = asctime(utctime);
164 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
165 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
166
167 return True;
168}
169
170/****************************************************************************
171 Do a specific test for a struct samu being valid for this connection
172 (ie not disabled, expired and the like).
173****************************************************************************/
174
175static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
176 struct samu *sampass,
177 const struct auth_usersupplied_info *user_info)
178{
179 uint32 acct_ctrl = pdb_get_acct_ctrl(sampass);
180 char *workstation_list;
181 time_t kickoff_time;
182
183 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
184
185 /* Quit if the account was disabled. */
186 if (acct_ctrl & ACB_DISABLED) {
187 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
188 return NT_STATUS_ACCOUNT_DISABLED;
189 }
190
191 /* Quit if the account was locked out. */
192 if (acct_ctrl & ACB_AUTOLOCK) {
193 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
194 return NT_STATUS_ACCOUNT_LOCKED_OUT;
195 }
196
197 /* Quit if the account is not allowed to logon at this time. */
198 if (! logon_hours_ok(sampass)) {
199 return NT_STATUS_INVALID_LOGON_HOURS;
200 }
201
202 /* Test account expire time */
203
204 kickoff_time = pdb_get_kickoff_time(sampass);
205 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
206 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
207 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
208 return NT_STATUS_ACCOUNT_EXPIRED;
209 }
210
211 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
212 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
213 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
214
215 /* check for immediate expiry "must change at next logon"
216 * for a user account. */
217 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
218 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
219 return NT_STATUS_PASSWORD_MUST_CHANGE;
220 }
221
222 /* check for expired password */
223 if (must_change_time < time(NULL) && must_change_time != 0) {
224 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
225 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
226 return NT_STATUS_PASSWORD_EXPIRED;
227 }
228 }
229
230 /* Test workstation. Workstation list is comma separated. */
231
232 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
233 if (!workstation_list)
234 return NT_STATUS_NO_MEMORY;
235
236 if (*workstation_list) {
237 bool invalid_ws = True;
238 char *tok = NULL;
239 const char *s = workstation_list;
240 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->workstation_name);
241
242 if (machine_name == NULL)
243 return NT_STATUS_NO_MEMORY;
244
245 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
246 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
247 tok, user_info->workstation_name));
248 if(strequal(tok, user_info->workstation_name)) {
249 invalid_ws = False;
250 break;
251 }
252 if (tok[0] == '+') {
253 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
254 machine_name, tok + 1));
255 if (user_in_group(machine_name, tok + 1)) {
256 invalid_ws = False;
257 break;
258 }
259 }
260 TALLOC_FREE(tok);
261 }
262 TALLOC_FREE(tok);
263 TALLOC_FREE(machine_name);
264
265 if (invalid_ws)
266 return NT_STATUS_INVALID_WORKSTATION;
267 }
268
269 if (acct_ctrl & ACB_DOMTRUST) {
270 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
271 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
272 }
273
274 if (acct_ctrl & ACB_SVRTRUST) {
275 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
276 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
277 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
278 }
279 }
280
281 if (acct_ctrl & ACB_WSTRUST) {
282 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
283 DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
284 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
285 }
286 }
287 return NT_STATUS_OK;
288}
289
290/**
291 * Check whether the given password is one of the last two
292 * password history entries. If so, the bad pwcount should
293 * not be incremented even thought the actual password check
294 * failed.
295 */
296static bool need_to_increment_bad_pw_count(
297 const DATA_BLOB *challenge,
298 struct samu* sampass,
299 const struct auth_usersupplied_info *user_info)
300{
301 uint8_t i;
302 const uint8_t *pwhistory;
303 uint32_t pwhistory_len;
304 uint32_t policy_pwhistory_len;
305 uint32_t acct_ctrl;
306 const char *username;
307 TALLOC_CTX *mem_ctx = talloc_stackframe();
308 bool result = true;
309
310 pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY,
311 &policy_pwhistory_len);
312 if (policy_pwhistory_len == 0) {
313 goto done;
314 }
315
316 pwhistory = pdb_get_pw_history(sampass, &pwhistory_len);
317 if (!pwhistory || pwhistory_len == 0) {
318 goto done;
319 }
320
321 acct_ctrl = pdb_get_acct_ctrl(sampass);
322 username = pdb_get_username(sampass);
323
324 for (i=1; i < MIN(MIN(3, policy_pwhistory_len), pwhistory_len); i++) {
325 static const uint8_t zero16[SALTED_MD5_HASH_LEN];
326 const uint8_t *salt;
327 const uint8_t *nt_pw;
328 NTSTATUS status;
329 DATA_BLOB user_sess_key = data_blob_null;
330 DATA_BLOB lm_sess_key = data_blob_null;
331
332 salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
333 nt_pw = salt + PW_HISTORY_SALT_LEN;
334
335 if (memcmp(zero16, nt_pw, NT_HASH_LEN) == 0) {
336 /* skip zero password hash */
337 continue;
338 }
339
340 if (memcmp(zero16, salt, PW_HISTORY_SALT_LEN) != 0) {
341 /* skip nonzero salt (old format entry) */
342 continue;
343 }
344
345 status = sam_password_ok(mem_ctx,
346 username, acct_ctrl,
347 challenge,
348 NULL, nt_pw,
349 user_info, &user_sess_key, &lm_sess_key);
350 if (NT_STATUS_IS_OK(status)) {
351 result = false;
352 break;
353 }
354 }
355
356done:
357 TALLOC_FREE(mem_ctx);
358 return result;
359}
360
361/****************************************************************************
362check if a username/password is OK assuming the password is a 24 byte
363SMB hash supplied in the user_info structure
364return an NT_STATUS constant.
365****************************************************************************/
366
367NTSTATUS check_sam_security(const DATA_BLOB *challenge,
368 TALLOC_CTX *mem_ctx,
369 const struct auth_usersupplied_info *user_info,
370 struct auth_serversupplied_info **server_info)
371{
372 struct samu *sampass=NULL;
373 bool ret;
374 NTSTATUS nt_status;
375 NTSTATUS update_login_attempts_status;
376 DATA_BLOB user_sess_key = data_blob_null;
377 DATA_BLOB lm_sess_key = data_blob_null;
378 bool updated_badpw = False;
379 const char *username;
380 const uint8_t *nt_pw;
381 const uint8_t *lm_pw;
382
383 /* the returned struct gets kept on the server_info, by means
384 of a steal further down */
385
386 sampass = samu_new(mem_ctx);
387 if (sampass == NULL) {
388 return NT_STATUS_NO_MEMORY;
389 }
390
391 /* get the account information */
392
393 become_root();
394 ret = pdb_getsampwnam(sampass, user_info->mapped.account_name);
395 unbecome_root();
396
397 if (ret == False) {
398 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
399 "passdb.\n", user_info->mapped.account_name));
400 TALLOC_FREE(sampass);
401 return NT_STATUS_NO_SUCH_USER;
402 }
403
404 username = pdb_get_username(sampass);
405 nt_pw = pdb_get_nt_passwd(sampass);
406 lm_pw = pdb_get_lanman_passwd(sampass);
407
408 /* Quit if the account was locked out. */
409 if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
410 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username));
411 return NT_STATUS_ACCOUNT_LOCKED_OUT;
412 }
413
414 nt_status = sam_password_ok(mem_ctx,
415 username, pdb_get_acct_ctrl(sampass),
416 challenge, lm_pw, nt_pw,
417 user_info, &user_sess_key, &lm_sess_key);
418
419 /* Notify passdb backend of login success/failure. If not
420 NT_STATUS_OK the backend doesn't like the login */
421
422 update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
423
424 if (!NT_STATUS_IS_OK(nt_status)) {
425 bool increment_bad_pw_count = false;
426
427 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
428 pdb_get_acct_ctrl(sampass) & ACB_NORMAL &&
429 NT_STATUS_IS_OK(update_login_attempts_status))
430 {
431 increment_bad_pw_count =
432 need_to_increment_bad_pw_count(
433 challenge, sampass, user_info);
434 }
435
436 if (increment_bad_pw_count) {
437 pdb_increment_bad_password_count(sampass);
438 updated_badpw = True;
439 } else {
440 pdb_update_bad_password_count(sampass,
441 &updated_badpw);
442 }
443 if (updated_badpw){
444 NTSTATUS status;
445
446 become_root();
447 status = pdb_update_sam_account(sampass);
448 unbecome_root();
449
450 if (!NT_STATUS_IS_OK(status)) {
451 DEBUG(1, ("Failed to modify entry: %s\n",
452 nt_errstr(status)));
453 }
454 }
455 goto done;
456 }
457
458 if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
459 (pdb_get_bad_password_count(sampass) > 0)){
460 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
461 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
462 updated_badpw = True;
463 }
464
465 if (updated_badpw){
466 NTSTATUS status;
467
468 become_root();
469 status = pdb_update_sam_account(sampass);
470 unbecome_root();
471
472 if (!NT_STATUS_IS_OK(status)) {
473 DEBUG(1, ("Failed to modify entry: %s\n",
474 nt_errstr(status)));
475 }
476 }
477
478 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
479
480 if (!NT_STATUS_IS_OK(nt_status)) {
481 goto done;
482 }
483
484 become_root();
485 nt_status = make_server_info_sam(server_info, sampass);
486 unbecome_root();
487
488 TALLOC_FREE(sampass);
489
490 if (!NT_STATUS_IS_OK(nt_status)) {
491 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
492 goto done;
493 }
494
495 (*server_info)->user_session_key =
496 data_blob_talloc(*server_info, user_sess_key.data,
497 user_sess_key.length);
498 data_blob_free(&user_sess_key);
499
500 (*server_info)->lm_session_key =
501 data_blob_talloc(*server_info, lm_sess_key.data,
502 lm_sess_key.length);
503 data_blob_free(&lm_sess_key);
504
505 (*server_info)->nss_token |= user_info->was_mapped;
506
507done:
508 TALLOC_FREE(sampass);
509 data_blob_free(&user_sess_key);
510 data_blob_free(&lm_sess_key);
511 return nt_status;
512}
513
514/* This helper function for winbindd returns a very similar value to
515 * what a NETLOGON call would give, without the indirection */
516NTSTATUS check_sam_security_info3(const DATA_BLOB *challenge,
517 TALLOC_CTX *mem_ctx,
518 const struct auth_usersupplied_info *user_info,
519 struct netr_SamInfo3 **pinfo3)
520{
521 struct auth_serversupplied_info *server_info = NULL;
522 struct netr_SamInfo3 *info3;
523 NTSTATUS status;
524 TALLOC_CTX *frame = talloc_stackframe();
525
526 status = check_sam_security(challenge, talloc_tos(), user_info,
527 &server_info);
528 if (!NT_STATUS_IS_OK(status)) {
529 DEBUG(10, ("check_sam_security failed: %s\n",
530 nt_errstr(status)));
531 goto done;
532 }
533
534 info3 = TALLOC_ZERO_P(mem_ctx, struct netr_SamInfo3);
535 if (info3 == NULL) {
536 status = NT_STATUS_NO_MEMORY;
537 goto done;
538 }
539
540 status = serverinfo_to_SamInfo3(server_info, NULL, 0, info3);
541 if (!NT_STATUS_IS_OK(status)) {
542 DEBUG(10, ("serverinfo_to_SamInfo3 failed: %s\n",
543 nt_errstr(status)));
544 goto done;
545 }
546 *pinfo3 = info3;
547 status = NT_STATUS_OK;
548done:
549 TALLOC_FREE(frame);
550 return status;
551}
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