r15549: removing rhosts and 'hosts equiv' authentication features
[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 2 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, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #include "includes.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         const char *username = pdb_get_username(sampass);
44
45         acct_ctrl = pdb_get_acct_ctrl(sampass);
46         if (acct_ctrl & ACB_PWNOTREQ) {
47                 if (lp_null_passwords()) {
48                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
49                         return NT_STATUS_OK;
50                 } else {
51                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
52                         return NT_STATUS_LOGON_FAILURE;
53                 }               
54         }
55
56         lm_pw = pdb_get_lanman_passwd(sampass);
57         nt_pw = pdb_get_nt_passwd(sampass);
58
59         return ntlm_password_check(mem_ctx, &auth_context->challenge, 
60                                    &user_info->lm_resp, &user_info->nt_resp, 
61                                    &user_info->lm_interactive_pwd, &user_info->nt_interactive_pwd,
62                                    username, 
63                                    user_info->smb_name,
64                                    user_info->client_domain,
65                                    lm_pw, nt_pw, user_sess_key, lm_sess_key);
66 }
67
68 /****************************************************************************
69  Check if a user is allowed to logon at this time. Note this is the
70  servers local time, as logon hours are just specified as a weekly
71  bitmask.
72 ****************************************************************************/
73                                                                                                               
74 static BOOL logon_hours_ok(struct samu *sampass)
75 {
76         /* In logon hours first bit is Sunday from 12AM to 1AM */
77         const uint8 *hours;
78         struct tm *utctime;
79         time_t lasttime;
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
91         /* find the corresponding byte and bit */
92         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
93         bitmask = 1 << (bitpos % 8);
94
95         if (! (hours[bitpos/8] & bitmask)) {
96                 DEBUG(1,("logon_hours_ok: Account for user %s not allowed to logon at this time (%s).\n",
97                         pdb_get_username(sampass), 
98                         asctime(localtime(&lasttime)) ));
99                 return False;
100         }
101
102         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
103                 pdb_get_username(sampass), asctime(utctime) ));
104
105         return True;
106 }
107
108 /****************************************************************************
109  Do a specific test for a struct samu being vaild for this connection 
110  (ie not disabled, expired and the like).
111 ****************************************************************************/
112
113 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
114                                struct samu *sampass, 
115                                const auth_usersupplied_info *user_info)
116 {
117         uint32  acct_ctrl = pdb_get_acct_ctrl(sampass);
118         char *workstation_list;
119         time_t kickoff_time;
120         
121         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
122
123         /* Quit if the account was disabled. */
124         if (acct_ctrl & ACB_DISABLED) {
125                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
126                 return NT_STATUS_ACCOUNT_DISABLED;
127         }
128
129         /* Quit if the account was locked out. */
130         if (acct_ctrl & ACB_AUTOLOCK) {
131                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
132                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
133         }
134
135         /* Quit if the account is not allowed to logon at this time. */
136         if (! logon_hours_ok(sampass)) {
137                 return NT_STATUS_INVALID_LOGON_HOURS;
138         }
139
140         /* Test account expire time */
141         
142         kickoff_time = pdb_get_kickoff_time(sampass);
143         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
144                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
145                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
146                 return NT_STATUS_ACCOUNT_EXPIRED;
147         }
148
149         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
150                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
151                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
152
153                 /* check for immediate expiry "must change at next logon" */
154                 if (must_change_time == 0 && last_set_time != 0) {
155                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
156                         return NT_STATUS_PASSWORD_MUST_CHANGE;
157                 }
158
159                 /* check for expired password */
160                 if (must_change_time < time(NULL) && must_change_time != 0) {
161                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
162                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
163                         return NT_STATUS_PASSWORD_EXPIRED;
164                 }
165         }
166
167         /* Test workstation. Workstation list is comma separated. */
168
169         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
170         if (!workstation_list)
171                 return NT_STATUS_NO_MEMORY;
172
173         if (*workstation_list) {
174                 BOOL invalid_ws = True;
175                 fstring tok;
176                 const char *s = workstation_list;
177
178                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
179                 if (machine_name == NULL)
180                         return NT_STATUS_NO_MEMORY;
181                         
182                         
183                 while (next_token(&s, tok, ",", sizeof(tok))) {
184                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
185                                   tok, user_info->wksta_name));
186                         if(strequal(tok, user_info->wksta_name)) {
187                                 invalid_ws = False;
188                                 break;
189                         }
190                         if (tok[0] == '+') {
191                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n", 
192                                         machine_name, tok + 1));
193                                 if (user_in_group(machine_name, tok + 1)) {
194                                         invalid_ws = False;
195                                         break;
196                                 }
197                         }
198                 }
199                 
200                 if (invalid_ws) 
201                         return NT_STATUS_INVALID_WORKSTATION;
202         }
203
204         if (acct_ctrl & ACB_DOMTRUST) {
205                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
206                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
207         }
208         
209         if (acct_ctrl & ACB_SVRTRUST) {
210                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
211                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
212                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
213                 }
214         }
215
216         if (acct_ctrl & ACB_WSTRUST) {
217                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
218                         DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
219                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
220                 }
221         }
222         return NT_STATUS_OK;
223 }
224
225 /****************************************************************************
226 check if a username/password is OK assuming the password is a 24 byte
227 SMB hash supplied in the user_info structure
228 return an NT_STATUS constant.
229 ****************************************************************************/
230
231 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
232                                    void *my_private_data, 
233                                    TALLOC_CTX *mem_ctx,
234                                    const auth_usersupplied_info *user_info, 
235                                    auth_serversupplied_info **server_info)
236 {
237         struct samu *sampass=NULL;
238         BOOL ret;
239         NTSTATUS nt_status;
240         NTSTATUS update_login_attempts_status;
241         DATA_BLOB user_sess_key = data_blob(NULL, 0);
242         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
243         BOOL updated_autolock = False, updated_badpw = False;
244
245         if (!user_info || !auth_context) {
246                 return NT_STATUS_UNSUCCESSFUL;
247         }
248
249         /* Can't use the talloc version here, because the returned struct gets
250            kept on the server_info */
251
252         if ( !(sampass = samu_new( NULL )) ) {
253                 return NT_STATUS_NO_MEMORY;
254         }
255
256         /* get the account information */
257
258         become_root();
259         ret = pdb_getsampwnam(sampass, user_info->internal_username);
260         unbecome_root();
261
262         if (ret == False) {
263                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
264                          "passdb.\n", user_info->internal_username));
265                 TALLOC_FREE(sampass);
266                 return NT_STATUS_NO_SUCH_USER;
267         }
268
269         /* see if autolock flag needs to be updated */
270         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
271                 pdb_update_autolock_flag(sampass, &updated_autolock);
272         /* Quit if the account was locked out. */
273         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
274                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
275                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
276         }
277
278         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, 
279                                     user_info, &user_sess_key, &lm_sess_key);
280
281         /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */
282         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
283         if (!NT_STATUS_IS_OK(update_login_attempts_status))
284                 nt_status = update_login_attempts_status;
285
286         if (!NT_STATUS_IS_OK(nt_status)) {
287                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) && 
288                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL) {  
289                         pdb_increment_bad_password_count(sampass);
290                         updated_badpw = True;
291                 } else {
292                         pdb_update_bad_password_count(sampass, 
293                                                       &updated_badpw);
294                 }
295                 if (updated_autolock || updated_badpw){
296                         become_root();
297                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
298                                 DEBUG(1, ("Failed to modify entry.\n"));
299                         unbecome_root();
300                 }
301                 data_blob_free(&user_sess_key);
302                 data_blob_free(&lm_sess_key);
303                 TALLOC_FREE(sampass);
304                 return nt_status;
305         }
306
307         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) && 
308             (pdb_get_bad_password_count(sampass) > 0)){
309                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
310                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
311                 updated_badpw = True;
312         }
313
314         if (updated_autolock || updated_badpw){
315                 become_root();
316                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
317                         DEBUG(1, ("Failed to modify entry.\n"));
318                 unbecome_root();
319         }
320
321         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
322
323         if (!NT_STATUS_IS_OK(nt_status)) {
324                 TALLOC_FREE(sampass);
325                 data_blob_free(&user_sess_key);
326                 data_blob_free(&lm_sess_key);
327                 return nt_status;
328         }
329
330         become_root();
331         nt_status = make_server_info_sam(server_info, sampass);
332         unbecome_root();
333
334         if (!NT_STATUS_IS_OK(nt_status)) {
335                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
336                 TALLOC_FREE(sampass);
337                 data_blob_free(&user_sess_key);
338                 data_blob_free(&lm_sess_key);
339                 return nt_status;
340         }
341
342         (*server_info)->user_session_key =
343                 data_blob_talloc(*server_info, user_sess_key.data,
344                                  user_sess_key.length);
345         data_blob_free(&user_sess_key);
346
347         (*server_info)->lm_session_key =
348                 data_blob_talloc(*server_info, lm_sess_key.data,
349                                  lm_sess_key.length);
350         data_blob_free(&lm_sess_key);
351
352         (*server_info)->was_mapped |= user_info->was_mapped;
353
354         return nt_status;
355 }
356
357 /* module initialisation */
358 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
359 {
360         if (!make_auth_methods(auth_context, auth_method)) {
361                 return NT_STATUS_NO_MEMORY;
362         }
363
364         (*auth_method)->auth = check_sam_security;      
365         (*auth_method)->name = "sam_ignoredomain";
366         return NT_STATUS_OK;
367 }
368
369
370 /****************************************************************************
371 Check SAM security (above) but with a few extra checks.
372 ****************************************************************************/
373
374 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
375                                          void *my_private_data, 
376                                          TALLOC_CTX *mem_ctx,
377                                          const auth_usersupplied_info *user_info, 
378                                          auth_serversupplied_info **server_info)
379 {
380         BOOL is_local_name, is_my_domain;
381
382         if (!user_info || !auth_context) {
383                 return NT_STATUS_LOGON_FAILURE;
384         }
385
386         is_local_name = is_myname(user_info->domain);
387         is_my_domain  = strequal(user_info->domain, lp_workgroup());
388
389         /* check whether or not we service this domain/workgroup name */
390         
391         switch ( lp_server_role() ) {
392                 case ROLE_STANDALONE:
393                 case ROLE_DOMAIN_MEMBER:
394                         if ( !is_local_name ) {
395                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
396                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER 
397                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
398                                 return NT_STATUS_NOT_IMPLEMENTED;
399                         }
400                 case ROLE_DOMAIN_PDC:
401                 case ROLE_DOMAIN_BDC:
402                         if ( !is_local_name && !is_my_domain ) {
403                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
404                                         user_info->domain));
405                                 return NT_STATUS_NOT_IMPLEMENTED;
406                         }
407                 default: /* name is ok */
408                         break;
409         }
410         
411         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
412 }
413
414 /* module initialisation */
415 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
416 {
417         if (!make_auth_methods(auth_context, auth_method)) {
418                 return NT_STATUS_NO_MEMORY;
419         }
420
421         (*auth_method)->auth = check_samstrict_security;
422         (*auth_method)->name = "sam";
423         return NT_STATUS_OK;
424 }
425
426 NTSTATUS auth_sam_init(void)
427 {
428         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
429         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
430         return NT_STATUS_OK;
431 }