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
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #define DBGC_CLASS DBGC_AUTH
28 /****************************************************************************
29 core of smb password checking routine.
30 ****************************************************************************/
31 static BOOL
smb_pwd_check_ntlmv1(const DATA_BLOB
*nt_response
,
32 const uchar
*part_passwd
,
33 const DATA_BLOB
*sec_blob
,
34 uint8 user_sess_key
[16])
36 /* Finish the encryption of part_passwd. */
39 if (part_passwd
== NULL
) {
40 DEBUG(10,("No password set - DISALLOWING access\n"));
41 /* No password set - always false ! */
45 if (sec_blob
->length
!= 8) {
46 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%d)\n", sec_blob
->length
));
50 if (nt_response
->length
!= 24) {
51 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%d)\n", nt_response
->length
));
55 SMBOWFencrypt(part_passwd
, sec_blob
->data
, p24
);
56 if (user_sess_key
!= NULL
)
58 SMBsesskeygen_ntv1(part_passwd
, NULL
, user_sess_key
);
64 DEBUG(100,("Part password (P16) was |\n"));
65 dump_data(100, part_passwd
, 16);
66 DEBUGADD(100,("Password from client was |\n"));
67 dump_data(100, nt_response
->data
, nt_response
->length
);
68 DEBUGADD(100,("Given challenge was |\n"));
69 dump_data(100, sec_blob
->data
, sec_blob
->length
);
70 DEBUGADD(100,("Value from encryption was |\n"));
71 dump_data(100, p24
, 24);
73 return (memcmp(p24
, nt_response
->data
, 24) == 0);
77 /****************************************************************************
78 core of smb password checking routine. (NTLMv2, LMv2)
80 Note: The same code works with both NTLMv2 and LMv2.
81 ****************************************************************************/
82 static BOOL
smb_pwd_check_ntlmv2(const DATA_BLOB
*ntv2_response
,
83 const uchar
*part_passwd
,
84 const DATA_BLOB
*sec_blob
,
85 const char *user
, const char *domain
,
86 uint8 user_sess_key
[16])
88 /* Finish the encryption of part_passwd. */
90 uchar value_from_encryption
[16];
91 uchar client_response
[16];
92 DATA_BLOB client_key_data
;
94 if (part_passwd
== NULL
)
96 DEBUG(10,("No password set - DISALLOWING access\n"));
97 /* No password set - always False */
101 if (ntv2_response
->length
< 24) {
102 /* We MUST have more than 16 bytes, or the stuff below will go
103 crazy. No known implementation sends less than the 24 bytes
104 for LMv2, let alone NTLMv2. */
105 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n",
106 ntv2_response
->length
));
110 client_key_data
= data_blob(ntv2_response
->data
+16, ntv2_response
->length
-16);
112 todo: should we be checking this for anything? We can't for LMv2,
113 but for NTLMv2 it is meant to contain the current time etc.
116 memcpy(client_response
, ntv2_response
->data
, sizeof(client_response
));
118 if (!ntv2_owf_gen(part_passwd
, user
, domain
, kr
)) {
122 SMBOWFencrypt_ntv2(kr
, sec_blob
, &client_key_data
, value_from_encryption
);
123 if (user_sess_key
!= NULL
)
125 SMBsesskeygen_ntv2(kr
, value_from_encryption
, user_sess_key
);
129 DEBUG(100,("Part password (P16) was |\n"));
130 dump_data(100, part_passwd
, 16);
131 DEBUGADD(100,("Password from client was |\n"));
132 dump_data(100, ntv2_response
->data
, ntv2_response
->length
);
133 DEBUGADD(100,("Variable data from client was |\n"));
134 dump_data(100, client_key_data
.data
, client_key_data
.length
);
135 DEBUGADD(100,("Given challenge was |\n"));
136 dump_data(100, sec_blob
->data
, sec_blob
->length
);
137 DEBUGADD(100,("Value from encryption was |\n"));
138 dump_data(100, value_from_encryption
, 16);
140 data_blob_clear_free(&client_key_data
);
141 return (memcmp(value_from_encryption
, client_response
, 16) == 0);
145 /****************************************************************************
146 Do a specific test for an smb password being correct, given a smb_password and
147 the lanman and NT responses.
148 ****************************************************************************/
149 static NTSTATUS
sam_password_ok(const struct auth_context
*auth_context
,
151 SAM_ACCOUNT
*sampass
,
152 const auth_usersupplied_info
*user_info
,
153 uint8 user_sess_key
[16])
156 const uint8
*nt_pw
, *lm_pw
;
159 acct_ctrl
= pdb_get_acct_ctrl(sampass
);
160 if (acct_ctrl
& ACB_PWNOTREQ
)
162 if (lp_null_passwords())
164 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass
)));
165 return(NT_STATUS_OK
);
169 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass
)));
170 return(NT_STATUS_LOGON_FAILURE
);
174 auth_flags
= user_info
->auth_flags
;
176 if (IS_SAM_DEFAULT(sampass
, PDB_NTPASSWD
)) {
177 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
178 pdb_get_username(sampass
)));
179 /* No return, we want to check the LM hash below in this case */
180 auth_flags
&= (~(AUTH_FLAG_NTLMv2_RESP
| AUTH_FLAG_NTLM_RESP
));
183 if (auth_flags
& AUTH_FLAG_NTLMv2_RESP
) {
184 nt_pw
= pdb_get_nt_passwd(sampass
);
185 /* We have the NT MD4 hash challenge available - see if we can
186 use it (ie. does it exist in the smbpasswd file).
188 DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", user_info
->client_domain
.str
));
189 if (smb_pwd_check_ntlmv2( &user_info
->nt_resp
,
190 nt_pw
, &auth_context
->challenge
,
191 user_info
->smb_name
.str
,
192 user_info
->client_domain
.str
,
198 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
199 if (smb_pwd_check_ntlmv2( &user_info
->nt_resp
,
200 nt_pw
, &auth_context
->challenge
,
201 user_info
->smb_name
.str
,
207 DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
208 return NT_STATUS_WRONG_PASSWORD
;
210 } else if (auth_flags
& AUTH_FLAG_NTLM_RESP
) {
211 if (lp_ntlm_auth()) {
212 nt_pw
= pdb_get_nt_passwd(sampass
);
213 /* We have the NT MD4 hash challenge available - see if we can
214 use it (ie. does it exist in the smbpasswd file).
216 DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
217 if (smb_pwd_check_ntlmv1(&user_info
->nt_resp
,
218 nt_pw
, &auth_context
->challenge
,
223 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass
)));
224 return NT_STATUS_WRONG_PASSWORD
;
227 DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass
)));
228 /* no return, becouse we might pick up LMv2 in the LM feild */
232 if (auth_flags
& AUTH_FLAG_LM_RESP
) {
233 if (user_info
->lm_resp
.length
!= 24) {
234 DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
235 user_info
->nt_resp
.length
, pdb_get_username(sampass
)));
238 if (!lp_lanman_auth()) {
239 DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass
)));
240 } else if (IS_SAM_DEFAULT(sampass
, PDB_LMPASSWD
)) {
241 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass
)));
243 lm_pw
= pdb_get_lanman_passwd(sampass
);
245 DEBUG(4,("sam_password_ok: Checking LM password\n"));
246 if (smb_pwd_check_ntlmv1(&user_info
->lm_resp
,
247 lm_pw
, &auth_context
->challenge
,
254 if (IS_SAM_DEFAULT(sampass
, PDB_NTPASSWD
)) {
255 DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass
)));
256 return NT_STATUS_WRONG_PASSWORD
;
259 nt_pw
= pdb_get_nt_passwd(sampass
);
261 /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
262 - related to Win9X, legacy NAS pass-though authentication
264 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info
->client_domain
.str
));
265 if (smb_pwd_check_ntlmv2( &user_info
->lm_resp
,
266 nt_pw
, &auth_context
->challenge
,
267 user_info
->smb_name
.str
,
268 user_info
->client_domain
.str
,
274 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
275 if (smb_pwd_check_ntlmv2( &user_info
->lm_resp
,
276 nt_pw
, &auth_context
->challenge
,
277 user_info
->smb_name
.str
,
284 /* Apparently NT accepts NT responses in the LM field
285 - I think this is related to Win9X pass-though authentication
287 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
290 if (smb_pwd_check_ntlmv1(&user_info
->lm_resp
,
291 nt_pw
, &auth_context
->challenge
,
296 DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass
)));
297 return NT_STATUS_WRONG_PASSWORD
;
299 DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",pdb_get_username(sampass
)));
300 return NT_STATUS_WRONG_PASSWORD
;
305 /* Should not be reached, but if they send nothing... */
306 DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass
)));
307 return NT_STATUS_WRONG_PASSWORD
;
310 /****************************************************************************
311 Do a specific test for a SAM_ACCOUNT being vaild for this connection
312 (ie not disabled, expired and the like).
313 ****************************************************************************/
314 static NTSTATUS
sam_account_ok(TALLOC_CTX
*mem_ctx
,
315 SAM_ACCOUNT
*sampass
,
316 const auth_usersupplied_info
*user_info
)
318 uint16 acct_ctrl
= pdb_get_acct_ctrl(sampass
);
319 char *workstation_list
;
322 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass
)));
324 /* Quit if the account was disabled. */
325 if (acct_ctrl
& ACB_DISABLED
) {
326 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass
)));
327 return NT_STATUS_ACCOUNT_DISABLED
;
330 /* Test account expire time */
332 kickoff_time
= pdb_get_kickoff_time(sampass
);
333 if (kickoff_time
!= 0 && time(NULL
) > kickoff_time
) {
334 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass
)));
335 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time
));
336 return NT_STATUS_ACCOUNT_EXPIRED
;
339 if (!(pdb_get_acct_ctrl(sampass
) & ACB_PWNOEXP
)) {
340 time_t must_change_time
= pdb_get_pass_must_change_time(sampass
);
341 time_t last_set_time
= pdb_get_pass_last_set_time(sampass
);
343 /* check for immediate expiry "must change at next logon" */
344 if (must_change_time
== 0 && last_set_time
!= 0) {
345 DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass
)));
346 return NT_STATUS_PASSWORD_MUST_CHANGE
;
349 /* check for expired password */
350 if (must_change_time
< time(NULL
) && must_change_time
!= 0) {
351 DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass
)));
352 DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time
), (long)must_change_time
));
353 return NT_STATUS_PASSWORD_EXPIRED
;
357 /* Test workstation. Workstation list is comma separated. */
359 workstation_list
= talloc_strdup(mem_ctx
, pdb_get_workstations(sampass
));
361 if (!workstation_list
) return NT_STATUS_NO_MEMORY
;
363 if (*workstation_list
) {
364 BOOL invalid_ws
= True
;
365 const char *s
= workstation_list
;
369 while (next_token(&s
, tok
, ",", sizeof(tok
))) {
370 DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
371 tok
, user_info
->wksta_name
.str
, user_info
->wksta_name
.len
));
372 if(strequal(tok
, user_info
->wksta_name
.str
)) {
379 return NT_STATUS_INVALID_WORKSTATION
;
382 if (acct_ctrl
& ACB_DOMTRUST
) {
383 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass
)));
384 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT
;
387 if (acct_ctrl
& ACB_SVRTRUST
) {
388 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass
)));
389 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT
;
392 if (acct_ctrl
& ACB_WSTRUST
) {
393 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass
)));
394 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT
;
401 /****************************************************************************
402 check if a username/password is OK assuming the password is a 24 byte
403 SMB hash supplied in the user_info structure
404 return an NT_STATUS constant.
405 ****************************************************************************/
407 static NTSTATUS
check_sam_security(const struct auth_context
*auth_context
,
408 void *my_private_data
,
410 const auth_usersupplied_info
*user_info
,
411 auth_serversupplied_info
**server_info
)
413 SAM_ACCOUNT
*sampass
=NULL
;
416 uint8 user_sess_key
[16];
417 const uint8
* lm_hash
;
419 if (!user_info
|| !auth_context
) {
420 return NT_STATUS_UNSUCCESSFUL
;
423 /* Can't use the talloc version here, becouse the returned struct gets
424 kept on the server_info */
425 if (!NT_STATUS_IS_OK(nt_status
= pdb_init_sam(&sampass
))) {
429 /* get the account information */
432 ret
= pdb_getsampwnam(sampass
, user_info
->internal_username
.str
);
437 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info
->internal_username
.str
));
438 pdb_free_sam(&sampass
);
439 return NT_STATUS_NO_SUCH_USER
;
442 nt_status
= sam_account_ok(mem_ctx
, sampass
, user_info
);
444 if (!NT_STATUS_IS_OK(nt_status
)) {
445 pdb_free_sam(&sampass
);
449 nt_status
= sam_password_ok(auth_context
, mem_ctx
, sampass
, user_info
, user_sess_key
);
451 if (!NT_STATUS_IS_OK(nt_status
)) {
452 pdb_free_sam(&sampass
);
456 if (!NT_STATUS_IS_OK(nt_status
= make_server_info_sam(server_info
, sampass
))) {
457 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status
)));
461 lm_hash
= pdb_get_lanman_passwd((*server_info
)->sam_account
);
463 memcpy((*server_info
)->first_8_lm_hash
, lm_hash
, 8);
466 memcpy((*server_info
)->session_key
, user_sess_key
, sizeof(user_sess_key
));
471 /* module initialisation */
472 NTSTATUS
auth_init_sam(struct auth_context
*auth_context
, const char *param
, auth_methods
**auth_method
)
474 if (!make_auth_methods(auth_context
, auth_method
)) {
475 return NT_STATUS_NO_MEMORY
;
478 (*auth_method
)->auth
= check_sam_security
;
479 (*auth_method
)->name
= "sam";
484 /****************************************************************************
485 Check SAM security (above) but with a few extra checks.
486 ****************************************************************************/
488 static NTSTATUS
check_samstrict_security(const struct auth_context
*auth_context
,
489 void *my_private_data
,
491 const auth_usersupplied_info
*user_info
,
492 auth_serversupplied_info
**server_info
)
495 if (!user_info
|| !auth_context
) {
496 return NT_STATUS_LOGON_FAILURE
;
499 /* If we are a domain member, we must not
500 attempt to check the password locally,
501 unless it is one of our aliases. */
503 if (!is_myname(user_info
->domain
.str
)) {
504 return NT_STATUS_NO_SUCH_USER
;
507 return check_sam_security(auth_context
, my_private_data
, mem_ctx
, user_info
, server_info
);
510 /* module initialisation */
511 NTSTATUS
auth_init_samstrict(struct auth_context
*auth_context
, const char *param
, auth_methods
**auth_method
)
513 if (!make_auth_methods(auth_context
, auth_method
)) {
514 return NT_STATUS_NO_MEMORY
;
517 (*auth_method
)->auth
= check_samstrict_security
;
518 (*auth_method
)->name
= "samstrict";
522 NTSTATUS
auth_sam_init(void)
524 smb_register_auth(AUTH_INTERFACE_VERSION
, "samstrict", auth_init_samstrict
);
525 smb_register_auth(AUTH_INTERFACE_VERSION
, "sam", auth_init_sam
);