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
7 Copyright (C) Gerald Carter 2003
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.
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.
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.
27 #define DBGC_CLASS DBGC_AUTH
29 /****************************************************************************
30 Core of smb password checking routine.
31 ****************************************************************************/
33 static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
34 const uchar *part_passwd,
35 const DATA_BLOB *sec_blob,
36 uint8 user_sess_key[16])
38 /* Finish the encryption of part_passwd. */
41 if (part_passwd == NULL) {
42 DEBUG(10,("No password set - DISALLOWING access\n"));
43 /* No password set - always false ! */
47 if (sec_blob->length != 8) {
48 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n", (unsigned long)sec_blob->length));
52 if (nt_response->length != 24) {
53 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n", (unsigned long)nt_response->length));
57 SMBOWFencrypt(part_passwd, sec_blob->data, p24);
58 if (user_sess_key != NULL) {
59 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key);
65 DEBUG(100,("Part password (P16) was |\n"));
66 dump_data(100, part_passwd, 16);
67 DEBUGADD(100,("Password from client was |\n"));
68 dump_data(100, nt_response->data, nt_response->length);
69 DEBUGADD(100,("Given challenge was |\n"));
70 dump_data(100, sec_blob->data, sec_blob->length);
71 DEBUGADD(100,("Value from encryption was |\n"));
72 dump_data(100, p24, 24);
74 return (memcmp(p24, nt_response->data, 24) == 0);
77 /****************************************************************************
78 Core of smb password checking routine. (NTLMv2, LMv2)
79 Note: The same code works with both NTLMv2 and LMv2.
80 ****************************************************************************/
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) {
95 DEBUG(10,("No password set - DISALLOWING access\n"));
96 /* No password set - always False */
100 if (ntv2_response->length < 24) {
101 /* We MUST have more than 16 bytes, or the stuff below will go
102 crazy. No known implementation sends less than the 24 bytes
103 for LMv2, let alone NTLMv2. */
104 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
105 (unsigned long)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) {
123 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
127 DEBUG(100,("Part password (P16) was |\n"));
128 dump_data(100, part_passwd, 16);
129 DEBUGADD(100,("Password from client was |\n"));
130 dump_data(100, ntv2_response->data, ntv2_response->length);
131 DEBUGADD(100,("Variable data from client was |\n"));
132 dump_data(100, client_key_data.data, client_key_data.length);
133 DEBUGADD(100,("Given challenge was |\n"));
134 dump_data(100, sec_blob->data, sec_blob->length);
135 DEBUGADD(100,("Value from encryption was |\n"));
136 dump_data(100, value_from_encryption, 16);
138 data_blob_clear_free(&client_key_data);
139 return (memcmp(value_from_encryption, client_response, 16) == 0);
142 /****************************************************************************
143 Do a specific test for an smb password being correct, given a smb_password and
144 the lanman and NT responses.
145 ****************************************************************************/
147 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
149 SAM_ACCOUNT *sampass,
150 const auth_usersupplied_info *user_info,
151 uint8 user_sess_key[16])
154 const uint8 *nt_pw, *lm_pw;
157 acct_ctrl = pdb_get_acct_ctrl(sampass);
158 if (acct_ctrl & ACB_PWNOTREQ) {
159 if (lp_null_passwords()) {
160 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
161 return(NT_STATUS_OK);
163 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
164 return(NT_STATUS_LOGON_FAILURE);
168 auth_flags = user_info->auth_flags;
170 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
171 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
172 pdb_get_username(sampass)));
173 /* No return, we want to check the LM hash below in this case */
174 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP | AUTH_FLAG_NTLM_RESP));
176 /* Check for cleartext netlogon. Used by Exchange 5.5. */
177 unsigned char zeros[8];
179 memset(zeros,'\0',sizeof(zeros));
180 if (auth_context->challenge.length == sizeof(zeros) &&
181 (memcmp(auth_context->challenge.data, zeros, auth_context->challenge.length) == 0 ) &&
182 user_info->nt_resp.length) {
183 if ((nt_pw = pdb_get_nt_passwd(sampass)) != NULL) {
184 unsigned char pwhash[16];
185 mdfour(pwhash, user_info->nt_resp.data, user_info->nt_resp.length);
186 if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
193 if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
194 nt_pw = pdb_get_nt_passwd(sampass);
195 /* We have the NT MD4 hash challenge available - see if we can
196 use it (ie. does it exist in the smbpasswd file).
198 DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", user_info->client_domain.str));
199 if (smb_pwd_check_ntlmv2( &user_info->nt_resp,
200 nt_pw, &auth_context->challenge,
201 user_info->smb_name.str,
202 user_info->client_domain.str,
207 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
208 if (smb_pwd_check_ntlmv2( &user_info->nt_resp,
209 nt_pw, &auth_context->challenge,
210 user_info->smb_name.str,
215 DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
216 return NT_STATUS_WRONG_PASSWORD;
218 } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
219 if (lp_ntlm_auth()) {
220 nt_pw = pdb_get_nt_passwd(sampass);
221 /* We have the NT MD4 hash challenge available - see if we can
222 use it (ie. does it exist in the smbpasswd file).
224 DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
225 if (smb_pwd_check_ntlmv1(&user_info->nt_resp,
226 nt_pw, &auth_context->challenge,
230 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
231 return NT_STATUS_WRONG_PASSWORD;
234 DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
235 /* no return, becouse we might pick up LMv2 in the LM field */
239 if (auth_flags & AUTH_FLAG_LM_RESP) {
240 if (user_info->lm_resp.length != 24) {
241 DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n",
242 (unsigned long)user_info->nt_resp.length, pdb_get_username(sampass)));
245 if (!lp_lanman_auth()) {
246 DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
247 } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
248 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
250 lm_pw = pdb_get_lanman_passwd(sampass);
252 DEBUG(4,("sam_password_ok: Checking LM password\n"));
253 if (smb_pwd_check_ntlmv1(&user_info->lm_resp,
254 lm_pw, &auth_context->challenge,
260 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
261 DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass)));
262 return NT_STATUS_WRONG_PASSWORD;
265 nt_pw = pdb_get_nt_passwd(sampass);
267 /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
268 - related to Win9X, legacy NAS pass-though authentication
270 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info->client_domain.str));
271 if (smb_pwd_check_ntlmv2( &user_info->lm_resp,
272 nt_pw, &auth_context->challenge,
273 user_info->smb_name.str,
274 user_info->client_domain.str,
279 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
280 if (smb_pwd_check_ntlmv2( &user_info->lm_resp,
281 nt_pw, &auth_context->challenge,
282 user_info->smb_name.str,
288 /* Apparently NT accepts NT responses in the LM field
289 - I think this is related to Win9X pass-though authentication
291 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
292 if (lp_ntlm_auth()) {
293 if (smb_pwd_check_ntlmv1(&user_info->lm_resp,
294 nt_pw, &auth_context->challenge,
298 DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass)));
299 return NT_STATUS_WRONG_PASSWORD;
301 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)));
302 return NT_STATUS_WRONG_PASSWORD;
307 /* Should not be reached, but if they send nothing... */
308 DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
309 return NT_STATUS_WRONG_PASSWORD;
312 /****************************************************************************
313 Do a specific test for a SAM_ACCOUNT being vaild for this connection
314 (ie not disabled, expired and the like).
315 ****************************************************************************/
317 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
318 SAM_ACCOUNT *sampass,
319 const auth_usersupplied_info *user_info)
321 uint16 acct_ctrl = pdb_get_acct_ctrl(sampass);
322 char *workstation_list;
325 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
327 /* Quit if the account was disabled. */
328 if (acct_ctrl & ACB_DISABLED) {
329 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
330 return NT_STATUS_ACCOUNT_DISABLED;
333 /* Quit if the account was locked out. */
334 if (acct_ctrl & ACB_AUTOLOCK) {
335 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
336 return NT_STATUS_ACCOUNT_LOCKED_OUT;
339 /* Test account expire time */
341 kickoff_time = pdb_get_kickoff_time(sampass);
342 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
343 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
344 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
345 return NT_STATUS_ACCOUNT_EXPIRED;
348 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
349 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
350 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
352 /* check for immediate expiry "must change at next logon" */
353 if (must_change_time == 0 && last_set_time != 0) {
354 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
355 return NT_STATUS_PASSWORD_MUST_CHANGE;
358 /* check for expired password */
359 if (must_change_time < time(NULL) && must_change_time != 0) {
360 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
361 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
362 return NT_STATUS_PASSWORD_EXPIRED;
366 /* Test workstation. Workstation list is comma separated. */
368 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
369 if (!workstation_list)
370 return NT_STATUS_NO_MEMORY;
372 if (*workstation_list) {
373 BOOL invalid_ws = True;
374 const char *s = workstation_list;
378 while (next_token(&s, tok, ",", sizeof(tok))) {
379 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
380 tok, user_info->wksta_name.str, user_info->wksta_name.len));
381 if(strequal(tok, user_info->wksta_name.str)) {
388 return NT_STATUS_INVALID_WORKSTATION;
391 if (acct_ctrl & ACB_DOMTRUST) {
392 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
393 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
396 if (acct_ctrl & ACB_SVRTRUST) {
397 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
398 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
401 if (acct_ctrl & ACB_WSTRUST) {
402 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
403 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
409 /****************************************************************************
410 check if a username/password is OK assuming the password is a 24 byte
411 SMB hash supplied in the user_info structure
412 return an NT_STATUS constant.
413 ****************************************************************************/
415 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
416 void *my_private_data,
418 const auth_usersupplied_info *user_info,
419 auth_serversupplied_info **server_info)
421 SAM_ACCOUNT *sampass=NULL;
424 uint8 user_sess_key[16];
425 const uint8* lm_hash;
427 if (!user_info || !auth_context) {
428 return NT_STATUS_UNSUCCESSFUL;
431 /* Can't use the talloc version here, because the returned struct gets
432 kept on the server_info */
433 if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
437 /* get the account information */
440 ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
444 DEBUG(3,("check_sam_security: Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
445 pdb_free_sam(&sampass);
446 return NT_STATUS_NO_SUCH_USER;
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 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
458 if (!NT_STATUS_IS_OK(nt_status)) {
459 pdb_free_sam(&sampass);
463 if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
464 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
468 lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
470 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
473 memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
478 /* module initialisation */
479 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
481 if (!make_auth_methods(auth_context, auth_method)) {
482 return NT_STATUS_NO_MEMORY;
485 (*auth_method)->auth = check_sam_security;
486 (*auth_method)->name = "sam_ignoredomain";
491 /****************************************************************************
492 Check SAM security (above) but with a few extra checks.
493 ****************************************************************************/
495 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
496 void *my_private_data,
498 const auth_usersupplied_info *user_info,
499 auth_serversupplied_info **server_info)
501 BOOL is_local_name, is_my_domain;
503 if (!user_info || !auth_context) {
504 return NT_STATUS_LOGON_FAILURE;
507 is_local_name = is_myname(user_info->domain.str);
508 is_my_domain = strequal(user_info->domain.str, lp_workgroup());
510 /* check whether or not we service this domain/workgroup name */
512 switch ( lp_server_role() ) {
513 case ROLE_STANDALONE:
514 case ROLE_DOMAIN_MEMBER:
515 if ( !is_local_name ) {
516 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
517 user_info->domain.str, (lp_server_role() == ROLE_DOMAIN_MEMBER
518 ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
519 return NT_STATUS_NOT_IMPLEMENTED;
521 case ROLE_DOMAIN_PDC:
522 case ROLE_DOMAIN_BDC:
523 if ( !is_local_name && !is_my_domain ) {
524 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
525 user_info->domain.str));
526 return NT_STATUS_NOT_IMPLEMENTED;
528 default: /* name is ok */
532 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
535 /* module initialisation */
536 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
538 if (!make_auth_methods(auth_context, auth_method)) {
539 return NT_STATUS_NO_MEMORY;
542 (*auth_method)->auth = check_samstrict_security;
543 (*auth_method)->name = "sam";
547 NTSTATUS auth_sam_init(void)
549 smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
550 smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);