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(DATA_BLOB nt_response,
32 const uchar *part_passwd,
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 |"));
65 dump_data(100, part_passwd, 16);
66 DEBUG(100,("Password from client was |"));
67 dump_data(100, nt_response.data, nt_response.length);
68 DEBUG(100,("Given challenge was |"));
69 dump_data(100, sec_blob.data, sec_blob.length);
70 DEBUG(100,("Value from encryption was |"));
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 < 16) {
102 /* We MUST have more than 16 bytes, or the stuff below will go
104 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n",
105 ntv2_response.length));
109 client_key_data = data_blob(ntv2_response.data+16, ntv2_response.length-16);
111 todo: should we be checking this for anything? We can't for LMv2,
112 but for NTLMv2 it is meant to contain the current time etc.
115 memcpy(client_response, ntv2_response.data, sizeof(client_response));
117 if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
121 SMBOWFencrypt_ntv2(kr, sec_blob, client_key_data, value_from_encryption);
122 if (user_sess_key != NULL)
124 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
128 DEBUG(100,("Part password (P16) was |"));
129 dump_data(100, part_passwd, 16);
130 DEBUG(100,("Password from client was |"));
131 dump_data(100, ntv2_response.data, ntv2_response.length);
132 DEBUG(100,("Variable data from client was |"));
133 dump_data(100, client_key_data.data, client_key_data.length);
134 DEBUG(100,("Given challenge was |"));
135 dump_data(100, sec_blob.data, sec_blob.length);
136 DEBUG(100,("Value from encryption was |"));
137 dump_data(100, value_from_encryption, 16);
139 data_blob_clear_free(&client_key_data);
140 return (memcmp(value_from_encryption, client_response, 16) == 0);
144 /****************************************************************************
145 Do a specific test for an smb password being correct, given a smb_password and
146 the lanman and NT responses.
147 ****************************************************************************/
148 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
150 SAM_ACCOUNT *sampass,
151 const auth_usersupplied_info *user_info,
152 uint8 user_sess_key[16])
155 const uint8 *nt_pw, *lm_pw;
158 acct_ctrl = pdb_get_acct_ctrl(sampass);
159 if (acct_ctrl & ACB_PWNOTREQ)
161 if (lp_null_passwords())
163 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
164 return(NT_STATUS_OK);
168 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
169 return(NT_STATUS_LOGON_FAILURE);
173 auth_flags = user_info->auth_flags;
175 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
176 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
177 pdb_get_username(sampass)));
178 /* No return, we want to check the LM hash below in this case */
179 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP | AUTH_FLAG_NTLM_RESP));
182 if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
183 nt_pw = pdb_get_nt_passwd(sampass);
184 /* We have the NT MD4 hash challenge available - see if we can
185 use it (ie. does it exist in the smbpasswd file).
187 DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", user_info->client_domain.str));
188 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
189 nt_pw, auth_context->challenge,
190 user_info->smb_name.str,
191 user_info->client_domain.str,
197 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
198 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
199 nt_pw, auth_context->challenge,
200 user_info->smb_name.str,
206 DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
207 return NT_STATUS_WRONG_PASSWORD;
209 } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
210 if (lp_ntlm_auth()) {
211 nt_pw = pdb_get_nt_passwd(sampass);
212 /* We have the NT MD4 hash challenge available - see if we can
213 use it (ie. does it exist in the smbpasswd file).
215 DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
216 if (smb_pwd_check_ntlmv1(user_info->nt_resp,
217 nt_pw, auth_context->challenge,
222 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
223 return NT_STATUS_WRONG_PASSWORD;
226 DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
227 /* no return, becouse we might pick up LMv2 in the LM feild */
231 if (auth_flags & AUTH_FLAG_LM_RESP) {
232 if (user_info->lm_resp.length != 24) {
233 DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
234 user_info->nt_resp.length, pdb_get_username(sampass)));
237 if (!lp_lanman_auth()) {
238 DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
239 } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
240 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
242 lm_pw = pdb_get_lanman_passwd(sampass);
244 DEBUG(4,("sam_password_ok: Checking LM password\n"));
245 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
246 lm_pw, auth_context->challenge,
253 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
254 DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass)));
255 return NT_STATUS_WRONG_PASSWORD;
258 nt_pw = pdb_get_nt_passwd(sampass);
260 /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
261 - related to Win9X, legacy NAS pass-though authentication
263 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info->client_domain.str));
264 if (smb_pwd_check_ntlmv2( user_info->lm_resp,
265 nt_pw, auth_context->challenge,
266 user_info->smb_name.str,
267 user_info->client_domain.str,
273 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
274 if (smb_pwd_check_ntlmv2( user_info->lm_resp,
275 nt_pw, auth_context->challenge,
276 user_info->smb_name.str,
283 /* Apparently NT accepts NT responses in the LM field
284 - I think this is related to Win9X pass-though authentication
286 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
289 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
290 nt_pw, auth_context->challenge,
295 DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass)));
296 return NT_STATUS_WRONG_PASSWORD;
298 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)));
299 return NT_STATUS_WRONG_PASSWORD;
304 /* Should not be reached, but if they send nothing... */
305 DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
306 return NT_STATUS_WRONG_PASSWORD;
309 /****************************************************************************
310 Do a specific test for a SAM_ACCOUNT being vaild for this connection
311 (ie not disabled, expired and the like).
312 ****************************************************************************/
313 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
314 SAM_ACCOUNT *sampass,
315 const auth_usersupplied_info *user_info)
317 uint16 acct_ctrl = pdb_get_acct_ctrl(sampass);
318 char *workstation_list;
321 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
323 /* Quit if the account was disabled. */
324 if (acct_ctrl & ACB_DISABLED) {
325 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
326 return NT_STATUS_ACCOUNT_DISABLED;
329 /* Test account expire time */
331 kickoff_time = pdb_get_kickoff_time(sampass);
332 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
333 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
334 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
335 return NT_STATUS_ACCOUNT_EXPIRED;
338 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
339 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
340 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
342 /* check for immediate expiry "must change at next logon" */
343 if (must_change_time == 0 && last_set_time != 0) {
344 DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
345 return NT_STATUS_PASSWORD_MUST_CHANGE;
348 /* check for expired password */
349 if (must_change_time < time(NULL) && must_change_time != 0) {
350 DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
351 DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
352 return NT_STATUS_PASSWORD_EXPIRED;
356 /* Test workstation. Workstation list is comma separated. */
358 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
360 if (!workstation_list) return NT_STATUS_NO_MEMORY;
362 if (*workstation_list) {
363 BOOL invalid_ws = True;
364 const char *s = workstation_list;
368 while (next_token(&s, tok, ",", sizeof(tok))) {
369 DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
370 tok, user_info->wksta_name.str, user_info->wksta_name.len));
371 if(strequal(tok, user_info->wksta_name.str)) {
378 return NT_STATUS_INVALID_WORKSTATION;
381 if (acct_ctrl & ACB_DOMTRUST) {
382 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
383 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
386 if (acct_ctrl & ACB_SVRTRUST) {
387 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
388 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
391 if (acct_ctrl & ACB_WSTRUST) {
392 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
393 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
400 /****************************************************************************
401 check if a username/password is OK assuming the password is a 24 byte
402 SMB hash supplied in the user_info structure
403 return an NT_STATUS constant.
404 ****************************************************************************/
406 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
407 void *my_private_data,
409 const auth_usersupplied_info *user_info,
410 auth_serversupplied_info **server_info)
412 SAM_ACCOUNT *sampass=NULL;
415 uint8 user_sess_key[16];
416 const uint8* lm_hash;
418 if (!user_info || !auth_context) {
419 return NT_STATUS_UNSUCCESSFUL;
422 /* Can't use the talloc version here, becouse the returned struct gets
423 kept on the server_info */
424 if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
428 /* get the account information */
431 ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
436 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
437 pdb_free_sam(&sampass);
438 return NT_STATUS_NO_SUCH_USER;
441 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
443 if (!NT_STATUS_IS_OK(nt_status)) {
444 pdb_free_sam(&sampass);
448 nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
450 if (!NT_STATUS_IS_OK(nt_status)) {
451 pdb_free_sam(&sampass);
455 if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
456 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
460 lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
462 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
465 memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
470 /* module initialisation */
471 NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
473 if (!make_auth_methods(auth_context, auth_method)) {
474 return NT_STATUS_NO_MEMORY;
477 (*auth_method)->auth = check_sam_security;
478 (*auth_method)->name = "sam";
483 /****************************************************************************
484 Check SAM security (above) but with a few extra checks.
485 ****************************************************************************/
487 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
488 void *my_private_data,
490 const auth_usersupplied_info *user_info,
491 auth_serversupplied_info **server_info)
494 if (!user_info || !auth_context) {
495 return NT_STATUS_LOGON_FAILURE;
498 /* If we are a domain member, we must not
499 attempt to check the password locally,
500 unless it is one of our aliases. */
502 if (!is_myname(user_info->domain.str)) {
503 DEBUG(7,("The requested user domain is not the local server name. [%s]\\[%s]\n",
504 user_info->domain.str,user_info->internal_username.str));
505 return NT_STATUS_NO_SUCH_USER;
508 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
511 /* module initialisation */
512 NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
514 if (!make_auth_methods(auth_context, auth_method)) {
515 return NT_STATUS_NO_MEMORY;
518 (*auth_method)->auth = check_samstrict_security;
519 (*auth_method)->name = "samstrict";
523 /****************************************************************************
524 Check SAM security (above) but with a few extra checks if we're a DC.
525 ****************************************************************************/
527 static NTSTATUS check_samstrict_dc_security(const struct auth_context *auth_context,
528 void *my_private_data,
530 const auth_usersupplied_info *user_info,
531 auth_serversupplied_info **server_info)
534 if (!user_info || !auth_context) {
535 return NT_STATUS_LOGON_FAILURE;
538 /* If we are a domain member, we must not
539 attempt to check the password locally,
540 unless it is one of our aliases, empty
541 or our domain if we are a logon server.*/
544 if ((!is_myworkgroup(user_info->domain.str))&&
545 (!is_myname(user_info->domain.str))) {
546 DEBUG(7,("The requested user domain is not the local server name or our domain. [%s]\\[%s]\n",
547 user_info->domain.str,user_info->internal_username.str));
548 return NT_STATUS_NO_SUCH_USER;
551 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
554 /* module initialisation */
555 NTSTATUS auth_init_samstrict_dc(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
557 if (!make_auth_methods(auth_context, auth_method)) {
558 return NT_STATUS_NO_MEMORY;
561 (*auth_method)->auth = check_samstrict_dc_security;
562 (*auth_method)->name = "samstrict_dc";
566 int auth_sam_init(void)
568 smb_register_auth("samstrict_dc", auth_init_samstrict_dc, AUTH_INTERFACE_VERSION);
569 smb_register_auth("samstrict", auth_init_samstrict, AUTH_INTERFACE_VERSION);
570 smb_register_auth("sam", auth_init_sam, AUTH_INTERFACE_VERSION);