source: branches/samba-3.5.x/source3/auth/auth_sam.c

Last change on this file was 480, checked in by Silvan Scherrer, 15 years ago

Samba Server 3.5: trunk update to 3.5.4
File size: 18.4 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 "../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
34static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
35 TALLOC_CTX *mem_ctx,
36 const char *username,
37 uint32_t acct_ctrl,
38 const uint8_t *lm_pw,
39 const uint8_t *nt_pw,
40 const auth_usersupplied_info *user_info,
41 DATA_BLOB *user_sess_key,
42 DATA_BLOB *lm_sess_key)
43{
44 struct samr_Password _lm_hash, _nt_hash, _client_lm_hash, _client_nt_hash;
45 struct samr_Password *lm_hash = NULL;
46 struct samr_Password *nt_hash = NULL;
47 struct samr_Password *client_lm_hash = NULL;
48 struct samr_Password *client_nt_hash = NULL;
49
50 *user_sess_key = data_blob_null;
51 *lm_sess_key = data_blob_null;
52
53 if (acct_ctrl & ACB_PWNOTREQ) {
54 if (lp_null_passwords()) {
55 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
56 return NT_STATUS_OK;
57 } else {
58 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
59 return NT_STATUS_LOGON_FAILURE;
60 }
61 }
62
63 if (lm_pw) {
64 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
65 lm_hash = &_lm_hash;
66 }
67 if (nt_pw) {
68 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
69 nt_hash = &_nt_hash;
70 }
71 if (user_info->lm_interactive_pwd.data && sizeof(_client_lm_hash.hash) == user_info->lm_interactive_pwd.length) {
72 memcpy(_client_lm_hash.hash, user_info->lm_interactive_pwd.data, sizeof(_lm_hash.hash));
73 client_lm_hash = &_client_lm_hash;
74 }
75 if (user_info->nt_interactive_pwd.data && sizeof(_client_nt_hash.hash) == user_info->nt_interactive_pwd.length) {
76 memcpy(_client_nt_hash.hash, user_info->nt_interactive_pwd.data, sizeof(_nt_hash.hash));
77 client_nt_hash = &_client_nt_hash;
78 }
79
80 if (client_lm_hash || client_nt_hash) {
81 if (!nt_pw) {
82 return NT_STATUS_WRONG_PASSWORD;
83 }
84 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
85 if (!user_sess_key->data) {
86 return NT_STATUS_NO_MEMORY;
87 }
88 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
89 return hash_password_check(mem_ctx, lp_lanman_auth(),
90 client_lm_hash,
91 client_nt_hash,
92 username,
93 lm_hash,
94 nt_hash);
95 } else {
96 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
97 lp_ntlm_auth(),
98 user_info->logon_parameters,
99 &auth_context->challenge,
100 &user_info->lm_resp, &user_info->nt_resp,
101 username,
102 user_info->smb_name,
103 user_info->client_domain,
104 lm_hash,
105 nt_hash,
106 user_sess_key, lm_sess_key);
107 }
108}
109
110/****************************************************************************
111 Check if a user is allowed to logon at this time. Note this is the
112 servers local time, as logon hours are just specified as a weekly
113 bitmask.
114****************************************************************************/
115
116static bool logon_hours_ok(struct samu *sampass)
117{
118 /* In logon hours first bit is Sunday from 12AM to 1AM */
119 const uint8 *hours;
120 struct tm *utctime;
121 time_t lasttime;
122 const char *asct;
123 uint8 bitmask, bitpos;
124
125 hours = pdb_get_hours(sampass);
126 if (!hours) {
127 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
128 return True;
129 }
130
131 lasttime = time(NULL);
132 utctime = gmtime(&lasttime);
133 if (!utctime) {
134 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
135 pdb_get_username(sampass) ));
136 return False;
137 }
138
139 /* find the corresponding byte and bit */
140 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
141 bitmask = 1 << (bitpos % 8);
142
143 if (! (hours[bitpos/8] & bitmask)) {
144 struct tm *t = localtime(&lasttime);
145 if (!t) {
146 asct = "INVALID TIME";
147 } else {
148 asct = asctime(t);
149 if (!asct) {
150 asct = "INVALID TIME";
151 }
152 }
153
154 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
155 "logon at this time (%s).\n",
156 pdb_get_username(sampass), asct ));
157 return False;
158 }
159
160 asct = asctime(utctime);
161 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
162 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
163
164 return True;
165}
166
167/****************************************************************************
168 Do a specific test for a struct samu being valid for this connection
169 (ie not disabled, expired and the like).
170****************************************************************************/
171
172static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
173 struct samu *sampass,
174 const auth_usersupplied_info *user_info)
175{
176 uint32 acct_ctrl = pdb_get_acct_ctrl(sampass);
177 char *workstation_list;
178 time_t kickoff_time;
179
180 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
181
182 /* Quit if the account was disabled. */
183 if (acct_ctrl & ACB_DISABLED) {
184 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
185 return NT_STATUS_ACCOUNT_DISABLED;
186 }
187
188 /* Quit if the account was locked out. */
189 if (acct_ctrl & ACB_AUTOLOCK) {
190 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
191 return NT_STATUS_ACCOUNT_LOCKED_OUT;
192 }
193
194 /* Quit if the account is not allowed to logon at this time. */
195 if (! logon_hours_ok(sampass)) {
196 return NT_STATUS_INVALID_LOGON_HOURS;
197 }
198
199 /* Test account expire time */
200
201 kickoff_time = pdb_get_kickoff_time(sampass);
202 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
203 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
204 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
205 return NT_STATUS_ACCOUNT_EXPIRED;
206 }
207
208 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
209 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
210 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
211
212 /* check for immediate expiry "must change at next logon"
213 * for a user account. */
214 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
215 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
216 return NT_STATUS_PASSWORD_MUST_CHANGE;
217 }
218
219 /* check for expired password */
220 if (must_change_time < time(NULL) && must_change_time != 0) {
221 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
222 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
223 return NT_STATUS_PASSWORD_EXPIRED;
224 }
225 }
226
227 /* Test workstation. Workstation list is comma separated. */
228
229 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
230 if (!workstation_list)
231 return NT_STATUS_NO_MEMORY;
232
233 if (*workstation_list) {
234 bool invalid_ws = True;
235 char *tok = NULL;
236 const char *s = workstation_list;
237 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
238
239 if (machine_name == NULL)
240 return NT_STATUS_NO_MEMORY;
241
242 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
243 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
244 tok, user_info->wksta_name));
245 if(strequal(tok, user_info->wksta_name)) {
246 invalid_ws = False;
247 break;
248 }
249 if (tok[0] == '+') {
250 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
251 machine_name, tok + 1));
252 if (user_in_group(machine_name, tok + 1)) {
253 invalid_ws = False;
254 break;
255 }
256 }
257 TALLOC_FREE(tok);
258 }
259 TALLOC_FREE(tok);
260 TALLOC_FREE(machine_name);
261
262 if (invalid_ws)
263 return NT_STATUS_INVALID_WORKSTATION;
264 }
265
266 if (acct_ctrl & ACB_DOMTRUST) {
267 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
268 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
269 }
270
271 if (acct_ctrl & ACB_SVRTRUST) {
272 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
273 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
274 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
275 }
276 }
277
278 if (acct_ctrl & ACB_WSTRUST) {
279 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
280 DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
281 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
282 }
283 }
284 return NT_STATUS_OK;
285}
286
287/**
288 * Check whether the given password is one of the last two
289 * password history entries. If so, the bad pwcount should
290 * not be incremented even thought the actual password check
291 * failed.
292 */
293static bool need_to_increment_bad_pw_count(
294 const struct auth_context *auth_context,
295 struct samu* sampass,
296 const auth_usersupplied_info *user_info)
297{
298 uint8_t i;
299 const uint8_t *pwhistory;
300 uint32_t pwhistory_len;
301 uint32_t policy_pwhistory_len;
302 uint32_t acct_ctrl;
303 const char *username;
304 TALLOC_CTX *mem_ctx = talloc_stackframe();
305 bool result = true;
306
307 pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY,
308 &policy_pwhistory_len);
309 if (policy_pwhistory_len == 0) {
310 goto done;
311 }
312
313 pwhistory = pdb_get_pw_history(sampass, &pwhistory_len);
314 if (!pwhistory || pwhistory_len == 0) {
315 goto done;
316 }
317
318 acct_ctrl = pdb_get_acct_ctrl(sampass);
319 username = pdb_get_username(sampass);
320
321 for (i=1; i < MIN(MIN(3, policy_pwhistory_len), pwhistory_len); i++) {
322 static const uint8_t zero16[SALTED_MD5_HASH_LEN];
323 const uint8_t *salt;
324 const uint8_t *nt_pw;
325 NTSTATUS status;
326 DATA_BLOB user_sess_key = data_blob_null;
327 DATA_BLOB lm_sess_key = data_blob_null;
328
329 salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
330 nt_pw = salt + PW_HISTORY_SALT_LEN;
331
332 if (memcmp(zero16, nt_pw, NT_HASH_LEN) == 0) {
333 /* skip zero password hash */
334 continue;
335 }
336
337 if (memcmp(zero16, salt, PW_HISTORY_SALT_LEN) != 0) {
338 /* skip nonzero salt (old format entry) */
339 continue;
340 }
341
342 status = sam_password_ok(auth_context, mem_ctx,
343 username, acct_ctrl, NULL, nt_pw,
344 user_info, &user_sess_key, &lm_sess_key);
345 if (NT_STATUS_IS_OK(status)) {
346 result = false;
347 break;
348 }
349 }
350
351done:
352 TALLOC_FREE(mem_ctx);
353 return result;
354}
355
356/****************************************************************************
357check if a username/password is OK assuming the password is a 24 byte
358SMB hash supplied in the user_info structure
359return an NT_STATUS constant.
360****************************************************************************/
361
362static NTSTATUS check_sam_security(const struct auth_context *auth_context,
363 void *my_private_data,
364 TALLOC_CTX *mem_ctx,
365 const auth_usersupplied_info *user_info,
366 auth_serversupplied_info **server_info)
367{
368 struct samu *sampass=NULL;
369 bool ret;
370 NTSTATUS nt_status;
371 NTSTATUS update_login_attempts_status;
372 DATA_BLOB user_sess_key = data_blob_null;
373 DATA_BLOB lm_sess_key = data_blob_null;
374 bool updated_autolock = False, updated_badpw = False;
375 const char *username;
376 const uint8_t *nt_pw;
377 const uint8_t *lm_pw;
378
379 if (!user_info || !auth_context) {
380 return NT_STATUS_UNSUCCESSFUL;
381 }
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->internal_username);
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->internal_username));
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 /* see if autolock flag needs to be updated */
409 if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
410 pdb_update_autolock_flag(sampass, &updated_autolock);
411 /* Quit if the account was locked out. */
412 if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
413 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username));
414 return NT_STATUS_ACCOUNT_LOCKED_OUT;
415 }
416
417 nt_status = sam_password_ok(auth_context, mem_ctx,
418 username, pdb_get_acct_ctrl(sampass), lm_pw, nt_pw,
419 user_info, &user_sess_key, &lm_sess_key);
420
421 /* Notify passdb backend of login success/failure. If not
422 NT_STATUS_OK the backend doesn't like the login */
423
424 update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
425
426 if (!NT_STATUS_IS_OK(nt_status)) {
427 bool increment_bad_pw_count = false;
428
429 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
430 pdb_get_acct_ctrl(sampass) & ACB_NORMAL &&
431 NT_STATUS_IS_OK(update_login_attempts_status))
432 {
433 increment_bad_pw_count =
434 need_to_increment_bad_pw_count(auth_context,
435 sampass,
436 user_info);
437 }
438
439 if (increment_bad_pw_count) {
440 pdb_increment_bad_password_count(sampass);
441 updated_badpw = True;
442 } else {
443 pdb_update_bad_password_count(sampass,
444 &updated_badpw);
445 }
446 if (updated_autolock || updated_badpw){
447 NTSTATUS status;
448
449 become_root();
450 status = pdb_update_sam_account(sampass);
451 unbecome_root();
452
453 if (!NT_STATUS_IS_OK(status)) {
454 DEBUG(1, ("Failed to modify entry: %s\n",
455 nt_errstr(status)));
456 }
457 }
458 goto done;
459 }
460
461 if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
462 (pdb_get_bad_password_count(sampass) > 0)){
463 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
464 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
465 updated_badpw = True;
466 }
467
468 if (updated_autolock || updated_badpw){
469 NTSTATUS status;
470
471 become_root();
472 status = pdb_update_sam_account(sampass);
473 unbecome_root();
474
475 if (!NT_STATUS_IS_OK(status)) {
476 DEBUG(1, ("Failed to modify entry: %s\n",
477 nt_errstr(status)));
478 }
479 }
480
481 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
482
483 if (!NT_STATUS_IS_OK(nt_status)) {
484 goto done;
485 }
486
487 become_root();
488 nt_status = make_server_info_sam(server_info, sampass);
489 unbecome_root();
490 sampass = NULL;
491
492 if (!NT_STATUS_IS_OK(nt_status)) {
493 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
494 goto done;
495 }
496
497 (*server_info)->user_session_key =
498 data_blob_talloc(*server_info, user_sess_key.data,
499 user_sess_key.length);
500 data_blob_free(&user_sess_key);
501
502 (*server_info)->lm_session_key =
503 data_blob_talloc(*server_info, lm_sess_key.data,
504 lm_sess_key.length);
505 data_blob_free(&lm_sess_key);
506
507 (*server_info)->nss_token |= user_info->was_mapped;
508
509done:
510 TALLOC_FREE(sampass);
511 data_blob_free(&user_sess_key);
512 data_blob_free(&lm_sess_key);
513 return nt_status;
514}
515
516/* module initialisation */
517static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
518{
519 if (!make_auth_methods(auth_context, auth_method)) {
520 return NT_STATUS_NO_MEMORY;
521 }
522
523 (*auth_method)->auth = check_sam_security;
524 (*auth_method)->name = "sam_ignoredomain";
525 return NT_STATUS_OK;
526}
527
528
529/****************************************************************************
530Check SAM security (above) but with a few extra checks.
531****************************************************************************/
532
533static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
534 void *my_private_data,
535 TALLOC_CTX *mem_ctx,
536 const auth_usersupplied_info *user_info,
537 auth_serversupplied_info **server_info)
538{
539 bool is_local_name, is_my_domain;
540
541 if (!user_info || !auth_context) {
542 return NT_STATUS_LOGON_FAILURE;
543 }
544
545 is_local_name = is_myname(user_info->domain);
546 is_my_domain = strequal(user_info->domain, lp_workgroup());
547
548 /* check whether or not we service this domain/workgroup name */
549
550 switch ( lp_server_role() ) {
551 case ROLE_STANDALONE:
552 case ROLE_DOMAIN_MEMBER:
553 if ( !is_local_name ) {
554 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
555 user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER
556 ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
557 return NT_STATUS_NOT_IMPLEMENTED;
558 }
559 case ROLE_DOMAIN_PDC:
560 case ROLE_DOMAIN_BDC:
561 if ( !is_local_name && !is_my_domain ) {
562 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
563 user_info->domain));
564 return NT_STATUS_NOT_IMPLEMENTED;
565 }
566 default: /* name is ok */
567 break;
568 }
569
570 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
571}
572
573/* module initialisation */
574static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
575{
576 if (!make_auth_methods(auth_context, auth_method)) {
577 return NT_STATUS_NO_MEMORY;
578 }
579
580 (*auth_method)->auth = check_samstrict_security;
581 (*auth_method)->name = "sam";
582 return NT_STATUS_OK;
583}
584
585NTSTATUS auth_sam_init(void)
586{
587 smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
588 smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
589 return NT_STATUS_OK;
590}
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