a9f1600d1778483b44f8fe91d21372d46faa4b6d
[amitay/samba.git] / source3 / auth / auth_sam.c
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(const struct auth_context *auth_context,
35                                 TALLOC_CTX *mem_ctx,
36                                 struct samu *sampass, 
37                                 const auth_usersupplied_info *user_info, 
38                                 DATA_BLOB *user_sess_key, 
39                                 DATA_BLOB *lm_sess_key)
40 {
41         uint32 acct_ctrl;
42         const uint8 *lm_pw, *nt_pw;
43         struct samr_Password _lm_hash, _nt_hash, _client_lm_hash, _client_nt_hash;
44         struct samr_Password *lm_hash = NULL;
45         struct samr_Password *nt_hash = NULL;
46         struct samr_Password *client_lm_hash = NULL;
47         struct samr_Password *client_nt_hash = NULL;
48         const char *username = pdb_get_username(sampass);
49
50         *user_sess_key = data_blob_null;
51         *lm_sess_key = data_blob_null;
52
53         acct_ctrl = pdb_get_acct_ctrl(sampass);
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         lm_pw = pdb_get_lanman_passwd(sampass);
65         nt_pw = pdb_get_nt_passwd(sampass);
66
67         if (lm_pw) {
68                 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
69                 lm_hash = &_lm_hash;
70         }
71         if (nt_pw) {
72                 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
73                 nt_hash = &_nt_hash;
74         }
75         if (user_info->lm_interactive_pwd.data && sizeof(_client_lm_hash.hash) == user_info->lm_interactive_pwd.length) {
76                 memcpy(_client_lm_hash.hash, user_info->lm_interactive_pwd.data, sizeof(_lm_hash.hash));
77                 client_lm_hash = &_client_lm_hash;
78         }
79         if (user_info->nt_interactive_pwd.data && sizeof(_client_nt_hash.hash) == user_info->nt_interactive_pwd.length) {
80                 memcpy(_client_nt_hash.hash, user_info->nt_interactive_pwd.data, sizeof(_nt_hash.hash));
81                 client_nt_hash = &_client_nt_hash;
82         }
83
84         if (client_lm_hash || client_nt_hash) {
85                 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
86                 if (!user_sess_key->data) {
87                         return NT_STATUS_NO_MEMORY;
88                 }
89                 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
90                 return hash_password_check(mem_ctx, lp_lanman_auth(),
91                                            client_lm_hash,
92                                            client_nt_hash,
93                                            username, 
94                                            lm_hash,
95                                            nt_hash);
96         } else {
97                 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
98                                            lp_ntlm_auth(),
99                                            user_info->logon_parameters,
100                                            &auth_context->challenge, 
101                                            &user_info->lm_resp, &user_info->nt_resp, 
102                                            username, 
103                                            user_info->smb_name,
104                                            user_info->client_domain,
105                                            lm_hash,
106                                            nt_hash,
107                                            user_sess_key, lm_sess_key);
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 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->wksta_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->wksta_name));
246                         if(strequal(tok, user_info->wksta_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 if a username/password is OK assuming the password is a 24 byte
290 SMB hash supplied in the user_info structure
291 return an NT_STATUS constant.
292 ****************************************************************************/
293
294 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
295                                    void *my_private_data, 
296                                    TALLOC_CTX *mem_ctx,
297                                    const auth_usersupplied_info *user_info, 
298                                    auth_serversupplied_info **server_info)
299 {
300         struct samu *sampass=NULL;
301         bool ret;
302         NTSTATUS nt_status;
303         NTSTATUS update_login_attempts_status;
304         DATA_BLOB user_sess_key = data_blob_null;
305         DATA_BLOB lm_sess_key = data_blob_null;
306         bool updated_autolock = False, updated_badpw = False;
307
308         if (!user_info || !auth_context) {
309                 return NT_STATUS_UNSUCCESSFUL;
310         }
311
312         /* the returned struct gets kept on the server_info, by means
313            of a steal further down */
314
315         sampass = samu_new(mem_ctx);
316         if (sampass == NULL) {
317                 return NT_STATUS_NO_MEMORY;
318         }
319
320         /* get the account information */
321
322         become_root();
323         ret = pdb_getsampwnam(sampass, user_info->internal_username);
324         unbecome_root();
325
326         if (ret == False) {
327                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
328                          "passdb.\n", user_info->internal_username));
329                 TALLOC_FREE(sampass);
330                 return NT_STATUS_NO_SUCH_USER;
331         }
332
333         /* see if autolock flag needs to be updated */
334         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
335                 pdb_update_autolock_flag(sampass, &updated_autolock);
336         /* Quit if the account was locked out. */
337         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
338                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
339                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
340         }
341
342         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, 
343                                     user_info, &user_sess_key, &lm_sess_key);
344
345         /* Notify passdb backend of login success/failure. If not 
346            NT_STATUS_OK the backend doesn't like the login */
347
348         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
349
350         if (!NT_STATUS_IS_OK(nt_status)) {
351                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) && 
352                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL &&
353                     NT_STATUS_IS_OK(update_login_attempts_status)) 
354                 {  
355                         pdb_increment_bad_password_count(sampass);
356                         updated_badpw = True;
357                 } else {
358                         pdb_update_bad_password_count(sampass, 
359                                                       &updated_badpw);
360                 }
361                 if (updated_autolock || updated_badpw){
362                         become_root();
363                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
364                                 DEBUG(1, ("Failed to modify entry.\n"));
365                         unbecome_root();
366                 }
367                 data_blob_free(&user_sess_key);
368                 data_blob_free(&lm_sess_key);
369                 TALLOC_FREE(sampass);
370                 return nt_status;
371         }
372
373         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) && 
374             (pdb_get_bad_password_count(sampass) > 0)){
375                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
376                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
377                 updated_badpw = True;
378         }
379
380         if (updated_autolock || updated_badpw){
381                 become_root();
382                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
383                         DEBUG(1, ("Failed to modify entry.\n"));
384                 unbecome_root();
385         }
386
387         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
388
389         if (!NT_STATUS_IS_OK(nt_status)) {
390                 TALLOC_FREE(sampass);
391                 data_blob_free(&user_sess_key);
392                 data_blob_free(&lm_sess_key);
393                 return nt_status;
394         }
395
396         become_root();
397         nt_status = make_server_info_sam(server_info, sampass);
398         unbecome_root();
399
400         if (!NT_STATUS_IS_OK(nt_status)) {
401                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
402                 data_blob_free(&user_sess_key);
403                 data_blob_free(&lm_sess_key);
404                 return nt_status;
405         }
406
407         (*server_info)->user_session_key =
408                 data_blob_talloc(*server_info, user_sess_key.data,
409                                  user_sess_key.length);
410         data_blob_free(&user_sess_key);
411
412         (*server_info)->lm_session_key =
413                 data_blob_talloc(*server_info, lm_sess_key.data,
414                                  lm_sess_key.length);
415         data_blob_free(&lm_sess_key);
416
417         (*server_info)->nss_token |= user_info->was_mapped;
418
419         return nt_status;
420 }
421
422 /* module initialisation */
423 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
424 {
425         if (!make_auth_methods(auth_context, auth_method)) {
426                 return NT_STATUS_NO_MEMORY;
427         }
428
429         (*auth_method)->auth = check_sam_security;      
430         (*auth_method)->name = "sam_ignoredomain";
431         return NT_STATUS_OK;
432 }
433
434
435 /****************************************************************************
436 Check SAM security (above) but with a few extra checks.
437 ****************************************************************************/
438
439 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
440                                          void *my_private_data, 
441                                          TALLOC_CTX *mem_ctx,
442                                          const auth_usersupplied_info *user_info, 
443                                          auth_serversupplied_info **server_info)
444 {
445         bool is_local_name, is_my_domain;
446
447         if (!user_info || !auth_context) {
448                 return NT_STATUS_LOGON_FAILURE;
449         }
450
451         is_local_name = is_myname(user_info->domain);
452         is_my_domain  = strequal(user_info->domain, lp_workgroup());
453
454         /* check whether or not we service this domain/workgroup name */
455
456         switch ( lp_server_role() ) {
457                 case ROLE_STANDALONE:
458                 case ROLE_DOMAIN_MEMBER:
459                         if ( !is_local_name ) {
460                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
461                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER 
462                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
463                                 return NT_STATUS_NOT_IMPLEMENTED;
464                         }
465                 case ROLE_DOMAIN_PDC:
466                 case ROLE_DOMAIN_BDC:
467                         if ( !is_local_name && !is_my_domain ) {
468                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
469                                         user_info->domain));
470                                 return NT_STATUS_NOT_IMPLEMENTED;
471                         }
472                 default: /* name is ok */
473                         break;
474         }
475
476         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
477 }
478
479 /* module initialisation */
480 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
481 {
482         if (!make_auth_methods(auth_context, auth_method)) {
483                 return NT_STATUS_NO_MEMORY;
484         }
485
486         (*auth_method)->auth = check_samstrict_security;
487         (*auth_method)->name = "sam";
488         return NT_STATUS_OK;
489 }
490
491 NTSTATUS auth_sam_init(void)
492 {
493         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
494         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
495         return NT_STATUS_OK;
496 }