a2634feb6c02c4b3ddb014d2946e8672922da8eb
[ira/wip.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         const char *username = pdb_get_username(sampass);
45         bool got_lm = false, got_nt = false;
46
47         *user_sess_key = data_blob(NULL, 0);
48         *lm_sess_key = data_blob(NULL, 0);
49
50         acct_ctrl = pdb_get_acct_ctrl(sampass);
51         if (acct_ctrl & ACB_PWNOTREQ) {
52                 if (lp_null_passwords()) {
53                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
54                         return NT_STATUS_OK;
55                 } else {
56                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
57                         return NT_STATUS_LOGON_FAILURE;
58                 }               
59         }
60
61         lm_pw = pdb_get_lanman_passwd(sampass);
62         nt_pw = pdb_get_nt_passwd(sampass);
63         if (lm_pw) {
64                 memcpy(lm_hash.hash, lm_pw, sizeof(lm_hash.hash));
65         }
66         if (nt_pw) {
67                 memcpy(nt_hash.hash, nt_pw, sizeof(nt_hash.hash));
68         }
69         if (user_info->lm_interactive_pwd.data && sizeof(client_lm_hash.hash) == user_info->lm_interactive_pwd.length) {
70                 memcpy(client_lm_hash.hash, user_info->lm_interactive_pwd.data, sizeof(lm_hash.hash));
71                 got_lm = true;
72         }
73         if (user_info->nt_interactive_pwd.data && sizeof(client_nt_hash.hash) == user_info->nt_interactive_pwd.length) {
74                 memcpy(client_nt_hash.hash, user_info->nt_interactive_pwd.data, sizeof(nt_hash.hash));
75                 got_nt = true;
76         }
77         if (got_lm || got_nt) {
78                 *user_sess_key = data_blob(mem_ctx, 16);
79                 if (!user_sess_key->data) {
80                         return NT_STATUS_NO_MEMORY;
81                 }
82                 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
83                 return hash_password_check(mem_ctx, lp_lanman_auth(),
84                                            got_lm ? &client_lm_hash : NULL, 
85                                            got_nt ? &client_nt_hash : NULL,
86                                            username, 
87                                            lm_pw ? &lm_hash: NULL, 
88                                            nt_pw ? &nt_hash : NULL);
89         } else {
90                 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
91                                            lp_ntlm_auth(),
92                                            user_info->logon_parameters,
93                                            &auth_context->challenge, 
94                                            &user_info->lm_resp, &user_info->nt_resp, 
95                                            username, 
96                                            user_info->smb_name,
97                                            user_info->client_domain,
98                                            lm_pw ? &lm_hash: NULL, 
99                                            nt_pw ? &nt_hash : NULL,
100                                            user_sess_key, lm_sess_key);
101         }
102 }
103
104 /****************************************************************************
105  Check if a user is allowed to logon at this time. Note this is the
106  servers local time, as logon hours are just specified as a weekly
107  bitmask.
108 ****************************************************************************/
109
110 static bool logon_hours_ok(struct samu *sampass)
111 {
112         /* In logon hours first bit is Sunday from 12AM to 1AM */
113         const uint8 *hours;
114         struct tm *utctime;
115         time_t lasttime;
116         const char *asct;
117         uint8 bitmask, bitpos;
118
119         hours = pdb_get_hours(sampass);
120         if (!hours) {
121                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
122                 return True;
123         }
124
125         lasttime = time(NULL);
126         utctime = gmtime(&lasttime);
127         if (!utctime) {
128                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
129                         pdb_get_username(sampass) ));
130                 return False;
131         }
132
133         /* find the corresponding byte and bit */
134         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
135         bitmask = 1 << (bitpos % 8);
136
137         if (! (hours[bitpos/8] & bitmask)) {
138                 struct tm *t = localtime(&lasttime);
139                 if (!t) {
140                         asct = "INVALID TIME";
141                 } else {
142                         asct = asctime(t);
143                         if (!asct) {
144                                 asct = "INVALID TIME";
145                         }
146                 }
147
148                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
149                           "logon at this time (%s).\n",
150                           pdb_get_username(sampass), asct ));
151                 return False;
152         }
153
154         asct = asctime(utctime);
155         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
156                 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
157
158         return True;
159 }
160
161 /****************************************************************************
162  Do a specific test for a struct samu being valid for this connection
163  (ie not disabled, expired and the like).
164 ****************************************************************************/
165
166 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
167                                struct samu *sampass, 
168                                const auth_usersupplied_info *user_info)
169 {
170         uint32  acct_ctrl = pdb_get_acct_ctrl(sampass);
171         char *workstation_list;
172         time_t kickoff_time;
173
174         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
175
176         /* Quit if the account was disabled. */
177         if (acct_ctrl & ACB_DISABLED) {
178                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
179                 return NT_STATUS_ACCOUNT_DISABLED;
180         }
181
182         /* Quit if the account was locked out. */
183         if (acct_ctrl & ACB_AUTOLOCK) {
184                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
185                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
186         }
187
188         /* Quit if the account is not allowed to logon at this time. */
189         if (! logon_hours_ok(sampass)) {
190                 return NT_STATUS_INVALID_LOGON_HOURS;
191         }
192
193         /* Test account expire time */
194
195         kickoff_time = pdb_get_kickoff_time(sampass);
196         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
197                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
198                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
199                 return NT_STATUS_ACCOUNT_EXPIRED;
200         }
201
202         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
203                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
204                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
205
206                 /* check for immediate expiry "must change at next logon" 
207                  * for a user account. */
208                 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
209                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
210                         return NT_STATUS_PASSWORD_MUST_CHANGE;
211                 }
212
213                 /* check for expired password */
214                 if (must_change_time < time(NULL) && must_change_time != 0) {
215                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
216                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
217                         return NT_STATUS_PASSWORD_EXPIRED;
218                 }
219         }
220
221         /* Test workstation. Workstation list is comma separated. */
222
223         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
224         if (!workstation_list)
225                 return NT_STATUS_NO_MEMORY;
226
227         if (*workstation_list) {
228                 bool invalid_ws = True;
229                 char *tok;
230                 const char *s = workstation_list;
231
232                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
233                 if (machine_name == NULL)
234                         return NT_STATUS_NO_MEMORY;
235
236                 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
237                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
238                                   tok, user_info->wksta_name));
239                         if(strequal(tok, user_info->wksta_name)) {
240                                 invalid_ws = False;
241                                 break;
242                         }
243                         if (tok[0] == '+') {
244                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n", 
245                                         machine_name, tok + 1));
246                                 if (user_in_group(machine_name, tok + 1)) {
247                                         invalid_ws = False;
248                                         break;
249                                 }
250                         }
251                         TALLOC_FREE(tok);
252                 }
253                 TALLOC_FREE(tok);
254
255                 if (invalid_ws)
256                         return NT_STATUS_INVALID_WORKSTATION;
257         }
258
259         if (acct_ctrl & ACB_DOMTRUST) {
260                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
261                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
262         }
263
264         if (acct_ctrl & ACB_SVRTRUST) {
265                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
266                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
267                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
268                 }
269         }
270
271         if (acct_ctrl & ACB_WSTRUST) {
272                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
273                         DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
274                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
275                 }
276         }
277         return NT_STATUS_OK;
278 }
279
280 /****************************************************************************
281 check if a username/password is OK assuming the password is a 24 byte
282 SMB hash supplied in the user_info structure
283 return an NT_STATUS constant.
284 ****************************************************************************/
285
286 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
287                                    void *my_private_data, 
288                                    TALLOC_CTX *mem_ctx,
289                                    const auth_usersupplied_info *user_info, 
290                                    auth_serversupplied_info **server_info)
291 {
292         struct samu *sampass=NULL;
293         bool ret;
294         NTSTATUS nt_status;
295         NTSTATUS update_login_attempts_status;
296         DATA_BLOB user_sess_key = data_blob_null;
297         DATA_BLOB lm_sess_key = data_blob_null;
298         bool updated_autolock = False, updated_badpw = False;
299
300         if (!user_info || !auth_context) {
301                 return NT_STATUS_UNSUCCESSFUL;
302         }
303
304         /* the returned struct gets kept on the server_info, by means
305            of a steal further down */
306
307         if ( !(sampass = samu_new( mem_ctx )) ) {
308                 return NT_STATUS_NO_MEMORY;
309         }
310
311         /* get the account information */
312
313         become_root();
314         ret = pdb_getsampwnam(sampass, user_info->internal_username);
315         unbecome_root();
316
317         if (ret == False) {
318                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
319                          "passdb.\n", user_info->internal_username));
320                 TALLOC_FREE(sampass);
321                 return NT_STATUS_NO_SUCH_USER;
322         }
323
324         /* see if autolock flag needs to be updated */
325         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
326                 pdb_update_autolock_flag(sampass, &updated_autolock);
327         /* Quit if the account was locked out. */
328         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
329                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
330                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
331         }
332
333         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, 
334                                     user_info, &user_sess_key, &lm_sess_key);
335
336         /* Notify passdb backend of login success/failure. If not 
337            NT_STATUS_OK the backend doesn't like the login */
338
339         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
340
341         if (!NT_STATUS_IS_OK(nt_status)) {
342                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) && 
343                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL &&
344                     NT_STATUS_IS_OK(update_login_attempts_status)) 
345                 {  
346                         pdb_increment_bad_password_count(sampass);
347                         updated_badpw = True;
348                 } else {
349                         pdb_update_bad_password_count(sampass, 
350                                                       &updated_badpw);
351                 }
352                 if (updated_autolock || updated_badpw){
353                         become_root();
354                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
355                                 DEBUG(1, ("Failed to modify entry.\n"));
356                         unbecome_root();
357                 }
358                 data_blob_free(&user_sess_key);
359                 data_blob_free(&lm_sess_key);
360                 TALLOC_FREE(sampass);
361                 return nt_status;
362         }
363
364         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) && 
365             (pdb_get_bad_password_count(sampass) > 0)){
366                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
367                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
368                 updated_badpw = True;
369         }
370
371         if (updated_autolock || updated_badpw){
372                 become_root();
373                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
374                         DEBUG(1, ("Failed to modify entry.\n"));
375                 unbecome_root();
376         }
377
378         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
379
380         if (!NT_STATUS_IS_OK(nt_status)) {
381                 TALLOC_FREE(sampass);
382                 data_blob_free(&user_sess_key);
383                 data_blob_free(&lm_sess_key);
384                 return nt_status;
385         }
386
387         become_root();
388         nt_status = make_server_info_sam(server_info, sampass);
389         unbecome_root();
390
391         if (!NT_STATUS_IS_OK(nt_status)) {
392                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
393                 data_blob_free(&user_sess_key);
394                 data_blob_free(&lm_sess_key);
395                 return nt_status;
396         }
397
398         (*server_info)->user_session_key =
399                 data_blob_talloc(*server_info, user_sess_key.data,
400                                  user_sess_key.length);
401         data_blob_free(&user_sess_key);
402
403         (*server_info)->lm_session_key =
404                 data_blob_talloc(*server_info, lm_sess_key.data,
405                                  lm_sess_key.length);
406         data_blob_free(&lm_sess_key);
407
408         (*server_info)->nss_token |= user_info->was_mapped;
409
410         return nt_status;
411 }
412
413 /* module initialisation */
414 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
415 {
416         if (!make_auth_methods(auth_context, auth_method)) {
417                 return NT_STATUS_NO_MEMORY;
418         }
419
420         (*auth_method)->auth = check_sam_security;      
421         (*auth_method)->name = "sam_ignoredomain";
422         return NT_STATUS_OK;
423 }
424
425
426 /****************************************************************************
427 Check SAM security (above) but with a few extra checks.
428 ****************************************************************************/
429
430 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
431                                          void *my_private_data, 
432                                          TALLOC_CTX *mem_ctx,
433                                          const auth_usersupplied_info *user_info, 
434                                          auth_serversupplied_info **server_info)
435 {
436         bool is_local_name, is_my_domain;
437
438         if (!user_info || !auth_context) {
439                 return NT_STATUS_LOGON_FAILURE;
440         }
441
442         is_local_name = is_myname(user_info->domain);
443         is_my_domain  = strequal(user_info->domain, lp_workgroup());
444
445         /* check whether or not we service this domain/workgroup name */
446
447         switch ( lp_server_role() ) {
448                 case ROLE_STANDALONE:
449                 case ROLE_DOMAIN_MEMBER:
450                         if ( !is_local_name ) {
451                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
452                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER 
453                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
454                                 return NT_STATUS_NOT_IMPLEMENTED;
455                         }
456                 case ROLE_DOMAIN_PDC:
457                 case ROLE_DOMAIN_BDC:
458                         if ( !is_local_name && !is_my_domain ) {
459                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
460                                         user_info->domain));
461                                 return NT_STATUS_NOT_IMPLEMENTED;
462                         }
463                 default: /* name is ok */
464                         break;
465         }
466
467         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
468 }
469
470 /* module initialisation */
471 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
472 {
473         if (!make_auth_methods(auth_context, auth_method)) {
474                 return NT_STATUS_NO_MEMORY;
475         }
476
477         (*auth_method)->auth = check_samstrict_security;
478         (*auth_method)->name = "sam";
479         return NT_STATUS_OK;
480 }
481
482 NTSTATUS auth_sam_init(void)
483 {
484         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
485         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
486         return NT_STATUS_OK;
487 }