source: vendor/3.5.0/source3/auth/auth_sam.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 17.7 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 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
82 if (!user_sess_key->data) {
83 return NT_STATUS_NO_MEMORY;
84 }
85 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
86 return hash_password_check(mem_ctx, lp_lanman_auth(),
87 client_lm_hash,
88 client_nt_hash,
89 username,
90 lm_hash,
91 nt_hash);
92 } else {
93 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
94 lp_ntlm_auth(),
95 user_info->logon_parameters,
96 &auth_context->challenge,
97 &user_info->lm_resp, &user_info->nt_resp,
98 username,
99 user_info->smb_name,
100 user_info->client_domain,
101 lm_hash,
102 nt_hash,
103 user_sess_key, lm_sess_key);
104 }
105}
106
107/****************************************************************************
108 Check if a user is allowed to logon at this time. Note this is the
109 servers local time, as logon hours are just specified as a weekly
110 bitmask.
111****************************************************************************/
112
113static bool logon_hours_ok(struct samu *sampass)
114{
115 /* In logon hours first bit is Sunday from 12AM to 1AM */
116 const uint8 *hours;
117 struct tm *utctime;
118 time_t lasttime;
119 const char *asct;
120 uint8 bitmask, bitpos;
121
122 hours = pdb_get_hours(sampass);
123 if (!hours) {
124 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
125 return True;
126 }
127
128 lasttime = time(NULL);
129 utctime = gmtime(&lasttime);
130 if (!utctime) {
131 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
132 pdb_get_username(sampass) ));
133 return False;
134 }
135
136 /* find the corresponding byte and bit */
137 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
138 bitmask = 1 << (bitpos % 8);
139
140 if (! (hours[bitpos/8] & bitmask)) {
141 struct tm *t = localtime(&lasttime);
142 if (!t) {
143 asct = "INVALID TIME";
144 } else {
145 asct = asctime(t);
146 if (!asct) {
147 asct = "INVALID TIME";
148 }
149 }
150
151 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
152 "logon at this time (%s).\n",
153 pdb_get_username(sampass), asct ));
154 return False;
155 }
156
157 asct = asctime(utctime);
158 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
159 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
160
161 return True;
162}
163
164/****************************************************************************
165 Do a specific test for a struct samu being valid for this connection
166 (ie not disabled, expired and the like).
167****************************************************************************/
168
169static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
170 struct samu *sampass,
171 const auth_usersupplied_info *user_info)
172{
173 uint32 acct_ctrl = pdb_get_acct_ctrl(sampass);
174 char *workstation_list;
175 time_t kickoff_time;
176
177 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
178
179 /* Quit if the account was disabled. */
180 if (acct_ctrl & ACB_DISABLED) {
181 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
182 return NT_STATUS_ACCOUNT_DISABLED;
183 }
184
185 /* Quit if the account was locked out. */
186 if (acct_ctrl & ACB_AUTOLOCK) {
187 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
188 return NT_STATUS_ACCOUNT_LOCKED_OUT;
189 }
190
191 /* Quit if the account is not allowed to logon at this time. */
192 if (! logon_hours_ok(sampass)) {
193 return NT_STATUS_INVALID_LOGON_HOURS;
194 }
195
196 /* Test account expire time */
197
198 kickoff_time = pdb_get_kickoff_time(sampass);
199 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
200 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
201 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
202 return NT_STATUS_ACCOUNT_EXPIRED;
203 }
204
205 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
206 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
207 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
208
209 /* check for immediate expiry "must change at next logon"
210 * for a user account. */
211 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
212 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
213 return NT_STATUS_PASSWORD_MUST_CHANGE;
214 }
215
216 /* check for expired password */
217 if (must_change_time < time(NULL) && must_change_time != 0) {
218 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
219 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
220 return NT_STATUS_PASSWORD_EXPIRED;
221 }
222 }
223
224 /* Test workstation. Workstation list is comma separated. */
225
226 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
227 if (!workstation_list)
228 return NT_STATUS_NO_MEMORY;
229
230 if (*workstation_list) {
231 bool invalid_ws = True;
232 char *tok = NULL;
233 const char *s = workstation_list;
234 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
235
236 if (machine_name == NULL)
237 return NT_STATUS_NO_MEMORY;
238
239 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
240 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
241 tok, user_info->wksta_name));
242 if(strequal(tok, user_info->wksta_name)) {
243 invalid_ws = False;
244 break;
245 }
246 if (tok[0] == '+') {
247 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
248 machine_name, tok + 1));
249 if (user_in_group(machine_name, tok + 1)) {
250 invalid_ws = False;
251 break;
252 }
253 }
254 TALLOC_FREE(tok);
255 }
256 TALLOC_FREE(tok);
257 TALLOC_FREE(machine_name);
258
259 if (invalid_ws)
260 return NT_STATUS_INVALID_WORKSTATION;
261 }
262
263 if (acct_ctrl & ACB_DOMTRUST) {
264 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
265 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
266 }
267
268 if (acct_ctrl & ACB_SVRTRUST) {
269 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
270 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
271 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
272 }
273 }
274
275 if (acct_ctrl & ACB_WSTRUST) {
276 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
277 DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
278 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
279 }
280 }
281 return NT_STATUS_OK;
282}
283
284/**
285 * Check whether the given password is one of the last two
286 * password history entries. If so, the bad pwcount should
287 * not be incremented even thought the actual password check
288 * failed.
289 */
290static bool need_to_increment_bad_pw_count(
291 const struct auth_context *auth_context,
292 struct samu* sampass,
293 const auth_usersupplied_info *user_info)
294{
295 uint8_t i;
296 const uint8_t *pwhistory;
297 uint32_t pwhistory_len;
298 uint32_t policy_pwhistory_len;
299 uint32_t acct_ctrl;
300 const char *username;
301 TALLOC_CTX *mem_ctx = talloc_stackframe();
302 bool result = true;
303
304 pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY,
305 &policy_pwhistory_len);
306 if (policy_pwhistory_len == 0) {
307 goto done;
308 }
309
310 pwhistory = pdb_get_pw_history(sampass, &pwhistory_len);
311 if (!pwhistory || pwhistory_len == 0) {
312 goto done;
313 }
314
315 acct_ctrl = pdb_get_acct_ctrl(sampass);
316 username = pdb_get_username(sampass);
317
318 for (i=1; i < MIN(MIN(3, policy_pwhistory_len), pwhistory_len); i++) {
319 static const uint8_t zero16[SALTED_MD5_HASH_LEN];
320 const uint8_t *salt;
321 const uint8_t *nt_pw;
322 NTSTATUS status;
323 DATA_BLOB user_sess_key = data_blob_null;
324 DATA_BLOB lm_sess_key = data_blob_null;
325
326 salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
327 nt_pw = salt + PW_HISTORY_SALT_LEN;
328
329 if (memcmp(zero16, nt_pw, NT_HASH_LEN) == 0) {
330 /* skip zero password hash */
331 continue;
332 }
333
334 if (memcmp(zero16, salt, PW_HISTORY_SALT_LEN) != 0) {
335 /* skip nonzero salt (old format entry) */
336 continue;
337 }
338
339 status = sam_password_ok(auth_context, mem_ctx,
340 username, acct_ctrl, NULL, nt_pw,
341 user_info, &user_sess_key, &lm_sess_key);
342 if (NT_STATUS_IS_OK(status)) {
343 result = false;
344 break;
345 }
346 }
347
348done:
349 TALLOC_FREE(mem_ctx);
350 return result;
351}
352
353/****************************************************************************
354check if a username/password is OK assuming the password is a 24 byte
355SMB hash supplied in the user_info structure
356return an NT_STATUS constant.
357****************************************************************************/
358
359static NTSTATUS check_sam_security(const struct auth_context *auth_context,
360 void *my_private_data,
361 TALLOC_CTX *mem_ctx,
362 const auth_usersupplied_info *user_info,
363 auth_serversupplied_info **server_info)
364{
365 struct samu *sampass=NULL;
366 bool ret;
367 NTSTATUS nt_status;
368 NTSTATUS update_login_attempts_status;
369 DATA_BLOB user_sess_key = data_blob_null;
370 DATA_BLOB lm_sess_key = data_blob_null;
371 bool updated_autolock = False, updated_badpw = False;
372 const char *username;
373 const uint8_t *nt_pw;
374 const uint8_t *lm_pw;
375
376 if (!user_info || !auth_context) {
377 return NT_STATUS_UNSUCCESSFUL;
378 }
379
380 /* the returned struct gets kept on the server_info, by means
381 of a steal further down */
382
383 sampass = samu_new(mem_ctx);
384 if (sampass == NULL) {
385 return NT_STATUS_NO_MEMORY;
386 }
387
388 /* get the account information */
389
390 become_root();
391 ret = pdb_getsampwnam(sampass, user_info->internal_username);
392 unbecome_root();
393
394 if (ret == False) {
395 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
396 "passdb.\n", user_info->internal_username));
397 TALLOC_FREE(sampass);
398 return NT_STATUS_NO_SUCH_USER;
399 }
400
401 username = pdb_get_username(sampass);
402 nt_pw = pdb_get_nt_passwd(sampass);
403 lm_pw = pdb_get_lanman_passwd(sampass);
404
405 /* see if autolock flag needs to be updated */
406 if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
407 pdb_update_autolock_flag(sampass, &updated_autolock);
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(auth_context, mem_ctx,
415 username, pdb_get_acct_ctrl(sampass), lm_pw, nt_pw,
416 user_info, &user_sess_key, &lm_sess_key);
417
418 /* Notify passdb backend of login success/failure. If not
419 NT_STATUS_OK the backend doesn't like the login */
420
421 update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
422
423 if (!NT_STATUS_IS_OK(nt_status)) {
424 bool increment_bad_pw_count = false;
425
426 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
427 pdb_get_acct_ctrl(sampass) & ACB_NORMAL &&
428 NT_STATUS_IS_OK(update_login_attempts_status))
429 {
430 increment_bad_pw_count =
431 need_to_increment_bad_pw_count(auth_context,
432 sampass,
433 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_autolock || 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_autolock || 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 sampass = NULL;
488
489 if (!NT_STATUS_IS_OK(nt_status)) {
490 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
491 goto done;
492 }
493
494 (*server_info)->user_session_key =
495 data_blob_talloc(*server_info, user_sess_key.data,
496 user_sess_key.length);
497 data_blob_free(&user_sess_key);
498
499 (*server_info)->lm_session_key =
500 data_blob_talloc(*server_info, lm_sess_key.data,
501 lm_sess_key.length);
502 data_blob_free(&lm_sess_key);
503
504 (*server_info)->nss_token |= user_info->was_mapped;
505
506done:
507 TALLOC_FREE(sampass);
508 data_blob_free(&user_sess_key);
509 data_blob_free(&lm_sess_key);
510 return nt_status;
511}
512
513/* module initialisation */
514static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
515{
516 if (!make_auth_methods(auth_context, auth_method)) {
517 return NT_STATUS_NO_MEMORY;
518 }
519
520 (*auth_method)->auth = check_sam_security;
521 (*auth_method)->name = "sam_ignoredomain";
522 return NT_STATUS_OK;
523}
524
525
526/****************************************************************************
527Check SAM security (above) but with a few extra checks.
528****************************************************************************/
529
530static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
531 void *my_private_data,
532 TALLOC_CTX *mem_ctx,
533 const auth_usersupplied_info *user_info,
534 auth_serversupplied_info **server_info)
535{
536 bool is_local_name, is_my_domain;
537
538 if (!user_info || !auth_context) {
539 return NT_STATUS_LOGON_FAILURE;
540 }
541
542 is_local_name = is_myname(user_info->domain);
543 is_my_domain = strequal(user_info->domain, lp_workgroup());
544
545 /* check whether or not we service this domain/workgroup name */
546
547 switch ( lp_server_role() ) {
548 case ROLE_STANDALONE:
549 case ROLE_DOMAIN_MEMBER:
550 if ( !is_local_name ) {
551 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
552 user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER
553 ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
554 return NT_STATUS_NOT_IMPLEMENTED;
555 }
556 case ROLE_DOMAIN_PDC:
557 case ROLE_DOMAIN_BDC:
558 if ( !is_local_name && !is_my_domain ) {
559 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
560 user_info->domain));
561 return NT_STATUS_NOT_IMPLEMENTED;
562 }
563 default: /* name is ok */
564 break;
565 }
566
567 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
568}
569
570/* module initialisation */
571static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
572{
573 if (!make_auth_methods(auth_context, auth_method)) {
574 return NT_STATUS_NO_MEMORY;
575 }
576
577 (*auth_method)->auth = check_samstrict_security;
578 (*auth_method)->name = "sam";
579 return NT_STATUS_OK;
580}
581
582NTSTATUS auth_sam_init(void)
583{
584 smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
585 smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
586 return NT_STATUS_OK;
587}
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