challange -> challenge
[samba.git] / source3 / auth / auth_sam.c
1 /* 
2    Unix SMB/Netbios implementation.
3    Version 1.9.
4    Password and authentication handling
5    Copyright (C) Andrew Tridgell              1992-2000
6    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
7    Copyright (C) Andrew Bartlett              2001
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 /****************************************************************************
27 core of smb password checking routine.
28 ****************************************************************************/
29 static BOOL smb_pwd_check_ntlmv1(DATA_BLOB nt_response,
30                                 const uchar *part_passwd,
31                                 DATA_BLOB sec_blob,
32                                 uint8 user_sess_key[16])
33 {
34         /* Finish the encryption of part_passwd. */
35         uchar p24[24];
36         
37         if (part_passwd == NULL) {
38                 DEBUG(10,("No password set - DISALLOWING access\n"));
39                 /* No password set - always false ! */
40                 return False;
41         }
42         
43         if (sec_blob.length != 8) {
44                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%d)\n", sec_blob.length));
45                 return False;
46         }
47         
48         if (nt_response.length != 24) {
49                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%d)\n", nt_response.length));
50                 return False;
51         }
52
53         SMBOWFencrypt(part_passwd, sec_blob.data, p24);
54         if (user_sess_key != NULL)
55         {
56                 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key);
57         }
58         
59         
60         
61 #if DEBUG_PASSWORD
62         DEBUG(100,("Part password (P16) was |"));
63         dump_data(100, part_passwd, 16);
64         DEBUG(100,("Password from client was |"));
65         dump_data(100, nt_response.data, nt_response.length);
66         DEBUG(100,("Given challenge was |"));
67         dump_data(100, sec_blob.data, sec_blob.length);
68         DEBUG(100,("Value from encryption was |"));
69         dump_data(100, p24, 24);
70 #endif
71   return (memcmp(p24, nt_response.data, 24) == 0);
72 }
73
74 /****************************************************************************
75 core of smb password checking routine.
76 ****************************************************************************/
77 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB ntv2_response,
78                                 const uchar *part_passwd,
79                                 const DATA_BLOB sec_blob,
80                                 const char *user, const char *domain,
81                                 uint8 user_sess_key[16])
82 {
83         /* Finish the encryption of part_passwd. */
84         uchar kr[16];
85         uchar value_from_encryption[16];
86         uchar client_response[16];
87         DATA_BLOB client_key_data;
88
89         if (part_passwd == NULL)
90         {
91                 DEBUG(10,("No password set - DISALLOWING access\n"));
92                 /* No password set - always False */
93                 return False;
94         }
95
96         if (ntv2_response.length < 16) {
97                 /* We MUST have more than 16 bytes, or the stuff below will go
98                    crazy... */
99                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n", 
100                           ntv2_response.length));
101                 return False;
102         }
103
104         client_key_data = data_blob(ntv2_response.data+16, ntv2_response.length-16);
105         memcpy(client_response, ntv2_response.data, sizeof(client_response));
106
107         ntv2_owf_gen(part_passwd, user, domain, kr);
108         SMBOWFencrypt_ntv2(kr, sec_blob, client_key_data, (char *)value_from_encryption);
109         if (user_sess_key != NULL)
110         {
111                 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
112         }
113
114 #if DEBUG_PASSWORD
115         DEBUG(100,("Part password (P16) was |"));
116         dump_data(100, part_passwd, 16);
117         DEBUG(100,("Password from client was |"));
118         dump_data(100, ntv2_response.data, ntv2_response.length);
119         DEBUG(100,("Variable data from client was |"));
120         dump_data(100, client_key_data.data, client_key_data.length);
121         DEBUG(100,("Given challenge was |"));
122         dump_data(100, sec_blob.data, sec_blob.length);
123         DEBUG(100,("Value from encryption was |"));
124         dump_data(100, value_from_encryption, 16);
125 #endif
126         data_blob_clear_free(&client_key_data);
127         return (memcmp(value_from_encryption, client_response, 16) == 0);
128 }
129
130
131 /****************************************************************************
132  Do a specific test for an smb password being correct, given a smb_password and
133  the lanman and NT responses.
134 ****************************************************************************/
135 static NTSTATUS sam_password_ok(SAM_ACCOUNT *sampass, 
136                                 const auth_usersupplied_info *user_info, 
137                                 const auth_authsupplied_info *auth_info,
138                                 uint8 user_sess_key[16])
139 {
140         uint16 acct_ctrl;
141         const uint8 *nt_pw, *lm_pw;
142         uint32 ntlmssp_flags;
143
144         acct_ctrl = pdb_get_acct_ctrl(sampass);
145         if (acct_ctrl & ACB_PWNOTREQ) 
146         {
147                 if (lp_null_passwords()) 
148                 {
149                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
150                         return(NT_STATUS_OK);
151                 } 
152                 else 
153                 {
154                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
155                         return(NT_STATUS_LOGON_FAILURE);
156                 }               
157         }
158
159         nt_pw = pdb_get_nt_passwd(sampass);
160         lm_pw = pdb_get_lanman_passwd(sampass);
161         
162         ntlmssp_flags = user_info->ntlmssp_flags;
163
164         if (nt_pw == NULL) {
165                 DEBUG(3,("smb_password_ok: NO NT password stored for user %s.\n", 
166                          pdb_get_username(sampass)));
167                 /* No return, we want to check the LM hash below in this case */
168                 ntlmssp_flags &= (~(NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_NTLM2));
169         }
170         
171         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM2) {
172                 /* We have the NT MD4 hash challenge available - see if we can
173                    use it (ie. does it exist in the smbpasswd file).
174                 */
175                 DEBUG(4,("smb_password_ok: Checking NTLMv2 password\n"));
176                 if (smb_pwd_check_ntlmv2( user_info->nt_resp, 
177                                           nt_pw, auth_info->challenge, 
178                                           user_info->smb_name.str, 
179                                           user_info->client_domain.str,
180                                           user_sess_key))
181                 {
182                         return NT_STATUS_OK;
183                 } else {
184                         DEBUG(3,("smb_password_ok: NTLMv2 password check failed\n"));
185                         return NT_STATUS_WRONG_PASSWORD;
186                 }
187         } else if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM) {
188                 if (lp_ntlm_auth()) {                           
189                         /* We have the NT MD4 hash challenge available - see if we can
190                            use it (ie. does it exist in the smbpasswd file).
191                         */
192                         DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
193                         if (smb_pwd_check_ntlmv1(user_info->nt_resp, 
194                                                  nt_pw, auth_info->challenge,
195                                                  user_sess_key)) 
196                         {
197                                 return NT_STATUS_OK;
198                         } else {
199                                 DEBUG(3,("smb_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
200                                 return NT_STATUS_WRONG_PASSWORD;
201                         }
202                 } else {
203                         DEBUG(2,("smb_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));                   
204                                 /* No return, we want to check the LM hash below in this case */
205                 }
206         }
207         
208         if (lm_pw == NULL) {
209                 DEBUG(3,("smb_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
210                 ntlmssp_flags &= (~NTLMSSP_NEGOTIATE_OEM);              
211         }
212         
213         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_OEM) {
214                 
215                 if (user_info->lm_resp.length != 24) {
216                         DEBUG(2,("smb_password_ok: invalid LanMan password length (%d) for user %s\n", 
217                                  user_info->nt_resp.length, pdb_get_username(sampass)));                
218                 }
219                 
220                 if (!lp_lanman_auth()) {
221                         DEBUG(3,("smb_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));                   
222                         return NT_STATUS_LOGON_FAILURE;
223                 }
224                 
225                 DEBUG(4,("smb_password_ok: Checking LM password\n"));
226                 if (smb_pwd_check_ntlmv1(user_info->lm_resp, 
227                                          lm_pw, auth_info->challenge,
228                                          user_sess_key)) 
229                 {
230                         return NT_STATUS_OK;
231                 } else {
232                         DEBUG(4,("smb_password_ok: LM password check failed for user %s\n",pdb_get_username(sampass)));
233                         return NT_STATUS_WRONG_PASSWORD;
234                 } 
235         }
236
237         /* Should not be reached, but if they send nothing... */
238         DEBUG(3,("smb_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
239         return NT_STATUS_WRONG_PASSWORD;
240 }
241
242 /****************************************************************************
243  Do a specific test for a SAM_ACCOUNT being vaild for this connection 
244  (ie not disabled, expired and the like).
245 ****************************************************************************/
246 static NTSTATUS sam_account_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info)
247 {
248         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
249         char *workstation_list;
250         time_t kickoff_time;
251         
252         DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
253
254         /* Quit if the account was disabled. */
255         if (acct_ctrl & ACB_DISABLED) {
256                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
257                 return NT_STATUS_ACCOUNT_DISABLED;
258         }
259
260         /* Test account expire time */
261         
262         kickoff_time = pdb_get_kickoff_time(sampass);
263         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
264                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
265                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
266                 return NT_STATUS_ACCOUNT_EXPIRED;
267         }
268
269         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
270                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
271                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
272
273                 /* check for immediate expiry "must change at next logon" */
274                 if (must_change_time == 0 && last_set_time != 0) {
275                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
276                         return NT_STATUS_PASSWORD_MUST_CHANGE;
277                 }
278
279                 /* check for expired password */
280                 if (must_change_time < time(NULL) && must_change_time != 0) {
281                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
282                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
283                         return NT_STATUS_PASSWORD_EXPIRED;
284                 }
285         }
286
287         /* Test workstation. Workstation list is comma separated. */
288
289         workstation_list = strdup(pdb_get_workstations(sampass));
290
291         if (!workstation_list) return NT_STATUS_NO_MEMORY;
292
293         if (*workstation_list) {
294                 BOOL invalid_ws = True;
295                 char *s = workstation_list;
296                         
297                 fstring tok;
298                         
299                 while (next_token(&s, tok, ",", sizeof(tok))) {
300                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
301                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
302                         if(strequal(tok, user_info->wksta_name.str)) {
303                                 invalid_ws = False;
304                                 break;
305                         }
306                 }
307                 
308                 SAFE_FREE(workstation_list);            
309                 if (invalid_ws) 
310                         return NT_STATUS_INVALID_WORKSTATION;
311         } else {
312                 SAFE_FREE(workstation_list);
313         }
314
315         if (acct_ctrl & ACB_DOMTRUST) {
316                 DEBUG(2,("session_trust_account: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
317                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
318         }
319         
320         if (acct_ctrl & ACB_SVRTRUST) {
321                 DEBUG(2,("session_trust_account: Server trust account %s denied by server\n", pdb_get_username(sampass)));
322                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
323         }
324         
325         if (acct_ctrl & ACB_WSTRUST) {
326                 DEBUG(4,("session_trust_account: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
327                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
328         }
329         
330         return NT_STATUS_OK;
331 }
332
333
334 /****************************************************************************
335 check if a username/password is OK assuming the password is a 24 byte
336 SMB hash supplied in the user_info structure
337 return an NT_STATUS constant.
338 ****************************************************************************/
339
340 NTSTATUS check_sam_security(void *my_private_dat,
341                             const auth_usersupplied_info *user_info, 
342                             const auth_authsupplied_info *auth_info,
343                             auth_serversupplied_info **server_info)
344 {
345         SAM_ACCOUNT *sampass=NULL;
346         BOOL ret;
347         NTSTATUS nt_status;
348         uint8 user_sess_key[16];
349         const uint8* lm_hash;
350
351         if (!user_info || !auth_info) {
352                 return NT_STATUS_LOGON_FAILURE;
353         }
354
355         if (!pdb_init_sam(&sampass)) {
356                 return NT_STATUS_NO_MEMORY;
357         }
358
359         /* get the account information */
360
361         become_root();
362         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
363         unbecome_root();
364
365         if (ret == False)
366         {
367                 DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
368                 pdb_free_sam(&sampass);
369                 return NT_STATUS_NO_SUCH_USER;
370         }
371
372         nt_status = sam_password_ok(sampass, user_info, auth_info, user_sess_key);
373
374         if (!NT_STATUS_IS_OK(nt_status)) {
375                 pdb_free_sam(&sampass);
376                 return nt_status;
377         }
378
379         nt_status = sam_account_ok(sampass, user_info);
380         
381         if (!NT_STATUS_IS_OK(nt_status)) {
382                 pdb_free_sam(&sampass);
383                 return nt_status;
384         }
385
386         if (!make_server_info_sam(server_info, sampass)) {              
387                 DEBUG(0,("failed to malloc memory for server_info\n"));
388                 return NT_STATUS_NO_MEMORY;
389         }
390
391         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
392         if (lm_hash) {
393                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
394         }
395         
396         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
397
398         return nt_status;
399 }
400
401 BOOL auth_init_sam(auth_methods **auth_method) 
402 {
403         if (!make_auth_methods(auth_method)) {
404                 return False;
405         }
406
407         (*auth_method)->auth = check_sam_security;
408         return True;
409 }
410
411
412