r23784: use the GPLv3 boilerplate as recommended by the FSF and the license text
[tprouty/samba.git] / source / 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
25 #undef DBGC_CLASS
26 #define DBGC_CLASS DBGC_AUTH
27
28 /****************************************************************************
29  Do a specific test for an smb password being correct, given a smb_password and
30  the lanman and NT responses.
31 ****************************************************************************/
32
33 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
34                                 TALLOC_CTX *mem_ctx,
35                                 struct samu *sampass, 
36                                 const auth_usersupplied_info *user_info, 
37                                 DATA_BLOB *user_sess_key, 
38                                 DATA_BLOB *lm_sess_key)
39 {
40         uint32 acct_ctrl;
41         const uint8 *lm_pw, *nt_pw;
42         const char *username = pdb_get_username(sampass);
43
44         acct_ctrl = pdb_get_acct_ctrl(sampass);
45         if (acct_ctrl & ACB_PWNOTREQ) {
46                 if (lp_null_passwords()) {
47                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
48                         return NT_STATUS_OK;
49                 } else {
50                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
51                         return NT_STATUS_LOGON_FAILURE;
52                 }               
53         }
54
55         lm_pw = pdb_get_lanman_passwd(sampass);
56         nt_pw = pdb_get_nt_passwd(sampass);
57
58         return ntlm_password_check(mem_ctx, &auth_context->challenge, 
59                                    &user_info->lm_resp, &user_info->nt_resp, 
60                                    &user_info->lm_interactive_pwd, &user_info->nt_interactive_pwd,
61                                    username, 
62                                    user_info->smb_name,
63                                    user_info->client_domain,
64                                    lm_pw, nt_pw, user_sess_key, lm_sess_key);
65 }
66
67 /****************************************************************************
68  Check if a user is allowed to logon at this time. Note this is the
69  servers local time, as logon hours are just specified as a weekly
70  bitmask.
71 ****************************************************************************/
72                                                                                                               
73 static BOOL logon_hours_ok(struct samu *sampass)
74 {
75         /* In logon hours first bit is Sunday from 12AM to 1AM */
76         const uint8 *hours;
77         struct tm *utctime;
78         time_t lasttime;
79         const char *asct;
80         uint8 bitmask, bitpos;
81
82         hours = pdb_get_hours(sampass);
83         if (!hours) {
84                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
85                 return True;
86         }
87
88         lasttime = time(NULL);
89         utctime = gmtime(&lasttime);
90         if (!utctime) {
91                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
92                         pdb_get_username(sampass) ));
93                 return False;
94         }
95
96         /* find the corresponding byte and bit */
97         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
98         bitmask = 1 << (bitpos % 8);
99
100         if (! (hours[bitpos/8] & bitmask)) {
101                 struct tm *t = localtime(&lasttime);
102                 if (!t) {
103                         asct = "INVALID TIME";
104                 } else {
105                         asct = asctime(t);
106                         if (!asct) {
107                                 asct = "INVALID TIME";
108                         }
109                 }
110                 
111                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
112                           "logon at this time (%s).\n",
113                           pdb_get_username(sampass), asct ));
114                 return False;
115         }
116
117         asct = asctime(utctime);
118         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
119                 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
120
121         return True;
122 }
123
124 /****************************************************************************
125  Do a specific test for a struct samu being vaild for this connection 
126  (ie not disabled, expired and the like).
127 ****************************************************************************/
128
129 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
130                                struct samu *sampass, 
131                                const auth_usersupplied_info *user_info)
132 {
133         uint32  acct_ctrl = pdb_get_acct_ctrl(sampass);
134         char *workstation_list;
135         time_t kickoff_time;
136         
137         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
138
139         /* Quit if the account was disabled. */
140         if (acct_ctrl & ACB_DISABLED) {
141                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
142                 return NT_STATUS_ACCOUNT_DISABLED;
143         }
144
145         /* Quit if the account was locked out. */
146         if (acct_ctrl & ACB_AUTOLOCK) {
147                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
148                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
149         }
150
151         /* Quit if the account is not allowed to logon at this time. */
152         if (! logon_hours_ok(sampass)) {
153                 return NT_STATUS_INVALID_LOGON_HOURS;
154         }
155
156         /* Test account expire time */
157         
158         kickoff_time = pdb_get_kickoff_time(sampass);
159         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
160                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
161                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
162                 return NT_STATUS_ACCOUNT_EXPIRED;
163         }
164
165         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
166                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
167                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
168
169                 /* check for immediate expiry "must change at next logon" */
170                 if (last_set_time == 0) {
171                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
172                         return NT_STATUS_PASSWORD_MUST_CHANGE;
173                 }
174
175                 /* check for expired password */
176                 if (must_change_time < time(NULL) && must_change_time != 0) {
177                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
178                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
179                         return NT_STATUS_PASSWORD_EXPIRED;
180                 }
181         }
182
183         /* Test workstation. Workstation list is comma separated. */
184
185         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
186         if (!workstation_list)
187                 return NT_STATUS_NO_MEMORY;
188
189         if (*workstation_list) {
190                 BOOL invalid_ws = True;
191                 fstring tok;
192                 const char *s = workstation_list;
193
194                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
195                 if (machine_name == NULL)
196                         return NT_STATUS_NO_MEMORY;
197                         
198                         
199                 while (next_token(&s, tok, ",", sizeof(tok))) {
200                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
201                                   tok, user_info->wksta_name));
202                         if(strequal(tok, user_info->wksta_name)) {
203                                 invalid_ws = False;
204                                 break;
205                         }
206                         if (tok[0] == '+') {
207                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n", 
208                                         machine_name, tok + 1));
209                                 if (user_in_group(machine_name, tok + 1)) {
210                                         invalid_ws = False;
211                                         break;
212                                 }
213                         }
214                 }
215                 
216                 if (invalid_ws) 
217                         return NT_STATUS_INVALID_WORKSTATION;
218         }
219
220         if (acct_ctrl & ACB_DOMTRUST) {
221                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
222                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
223         }
224         
225         if (acct_ctrl & ACB_SVRTRUST) {
226                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
227                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
228                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
229                 }
230         }
231
232         if (acct_ctrl & ACB_WSTRUST) {
233                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
234                         DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
235                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
236                 }
237         }
238         return NT_STATUS_OK;
239 }
240
241 /****************************************************************************
242 check if a username/password is OK assuming the password is a 24 byte
243 SMB hash supplied in the user_info structure
244 return an NT_STATUS constant.
245 ****************************************************************************/
246
247 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
248                                    void *my_private_data, 
249                                    TALLOC_CTX *mem_ctx,
250                                    const auth_usersupplied_info *user_info, 
251                                    auth_serversupplied_info **server_info)
252 {
253         struct samu *sampass=NULL;
254         BOOL ret;
255         NTSTATUS nt_status;
256         NTSTATUS update_login_attempts_status;
257         DATA_BLOB user_sess_key = data_blob_null;
258         DATA_BLOB lm_sess_key = data_blob_null;
259         BOOL updated_autolock = False, updated_badpw = False;
260
261         if (!user_info || !auth_context) {
262                 return NT_STATUS_UNSUCCESSFUL;
263         }
264
265         /* the returned struct gets kept on the server_info, by means
266            of a steal further down */
267
268         if ( !(sampass = samu_new( mem_ctx )) ) {
269                 return NT_STATUS_NO_MEMORY;
270         }
271
272         /* get the account information */
273
274         become_root();
275         ret = pdb_getsampwnam(sampass, user_info->internal_username);
276         unbecome_root();
277
278         if (ret == False) {
279                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
280                          "passdb.\n", user_info->internal_username));
281                 TALLOC_FREE(sampass);
282                 return NT_STATUS_NO_SUCH_USER;
283         }
284
285         /* see if autolock flag needs to be updated */
286         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
287                 pdb_update_autolock_flag(sampass, &updated_autolock);
288         /* Quit if the account was locked out. */
289         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
290                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
291                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
292         }
293
294         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, 
295                                     user_info, &user_sess_key, &lm_sess_key);
296
297         /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */
298         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
299         if (!NT_STATUS_IS_OK(update_login_attempts_status))
300                 nt_status = update_login_attempts_status;
301
302         if (!NT_STATUS_IS_OK(nt_status)) {
303                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) && 
304                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL) {  
305                         pdb_increment_bad_password_count(sampass);
306                         updated_badpw = True;
307                 } else {
308                         pdb_update_bad_password_count(sampass, 
309                                                       &updated_badpw);
310                 }
311                 if (updated_autolock || updated_badpw){
312                         become_root();
313                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
314                                 DEBUG(1, ("Failed to modify entry.\n"));
315                         unbecome_root();
316                 }
317                 data_blob_free(&user_sess_key);
318                 data_blob_free(&lm_sess_key);
319                 TALLOC_FREE(sampass);
320                 return nt_status;
321         }
322
323         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) && 
324             (pdb_get_bad_password_count(sampass) > 0)){
325                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
326                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
327                 updated_badpw = True;
328         }
329
330         if (updated_autolock || updated_badpw){
331                 become_root();
332                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
333                         DEBUG(1, ("Failed to modify entry.\n"));
334                 unbecome_root();
335         }
336
337         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
338
339         if (!NT_STATUS_IS_OK(nt_status)) {
340                 TALLOC_FREE(sampass);
341                 data_blob_free(&user_sess_key);
342                 data_blob_free(&lm_sess_key);
343                 return nt_status;
344         }
345
346         become_root();
347         nt_status = make_server_info_sam(server_info, sampass);
348         unbecome_root();
349
350         if (!NT_STATUS_IS_OK(nt_status)) {
351                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
352                 TALLOC_FREE(sampass);
353                 data_blob_free(&user_sess_key);
354                 data_blob_free(&lm_sess_key);
355                 return nt_status;
356         }
357
358         (*server_info)->user_session_key =
359                 data_blob_talloc(*server_info, user_sess_key.data,
360                                  user_sess_key.length);
361         data_blob_free(&user_sess_key);
362
363         (*server_info)->lm_session_key =
364                 data_blob_talloc(*server_info, lm_sess_key.data,
365                                  lm_sess_key.length);
366         data_blob_free(&lm_sess_key);
367
368         (*server_info)->was_mapped |= user_info->was_mapped;
369
370         return nt_status;
371 }
372
373 /* module initialisation */
374 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
375 {
376         if (!make_auth_methods(auth_context, auth_method)) {
377                 return NT_STATUS_NO_MEMORY;
378         }
379
380         (*auth_method)->auth = check_sam_security;      
381         (*auth_method)->name = "sam_ignoredomain";
382         return NT_STATUS_OK;
383 }
384
385
386 /****************************************************************************
387 Check SAM security (above) but with a few extra checks.
388 ****************************************************************************/
389
390 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
391                                          void *my_private_data, 
392                                          TALLOC_CTX *mem_ctx,
393                                          const auth_usersupplied_info *user_info, 
394                                          auth_serversupplied_info **server_info)
395 {
396         BOOL is_local_name, is_my_domain;
397
398         if (!user_info || !auth_context) {
399                 return NT_STATUS_LOGON_FAILURE;
400         }
401
402         is_local_name = is_myname(user_info->domain);
403         is_my_domain  = strequal(user_info->domain, lp_workgroup());
404
405         /* check whether or not we service this domain/workgroup name */
406         
407         switch ( lp_server_role() ) {
408                 case ROLE_STANDALONE:
409                 case ROLE_DOMAIN_MEMBER:
410                         if ( !is_local_name ) {
411                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
412                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER 
413                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
414                                 return NT_STATUS_NOT_IMPLEMENTED;
415                         }
416                 case ROLE_DOMAIN_PDC:
417                 case ROLE_DOMAIN_BDC:
418                         if ( !is_local_name && !is_my_domain ) {
419                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
420                                         user_info->domain));
421                                 return NT_STATUS_NOT_IMPLEMENTED;
422                         }
423                 default: /* name is ok */
424                         break;
425         }
426         
427         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
428 }
429
430 /* module initialisation */
431 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
432 {
433         if (!make_auth_methods(auth_context, auth_method)) {
434                 return NT_STATUS_NO_MEMORY;
435         }
436
437         (*auth_method)->auth = check_samstrict_security;
438         (*auth_method)->name = "sam";
439         return NT_STATUS_OK;
440 }
441
442 NTSTATUS auth_sam_init(void)
443 {
444         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
445         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
446         return NT_STATUS_OK;
447 }