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 DATA_BLOB *user_sess_key)
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 *user_sess_key = data_blob(NULL, 16);
60 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
66 DEBUG(100,("Part password (P16) was |\n"));
67 dump_data(100, part_passwd, 16);
68 DEBUGADD(100,("Password from client was |\n"));
69 dump_data(100, nt_response->data, nt_response->length);
70 DEBUGADD(100,("Given challenge was |\n"));
71 dump_data(100, sec_blob->data, sec_blob->length);
72 DEBUGADD(100,("Value from encryption was |\n"));
73 dump_data(100, p24, 24);
75 return (memcmp(p24, nt_response->data, 24) == 0);
78 /****************************************************************************
79 Core of smb password checking routine. (NTLMv2, LMv2)
80 Note: The same code works with both NTLMv2 and LMv2.
81 ****************************************************************************/
83 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
84 const uchar *part_passwd,
85 const DATA_BLOB *sec_blob,
86 const char *user, const char *domain,
87 DATA_BLOB *user_sess_key)
89 /* Finish the encryption of part_passwd. */
91 uchar value_from_encryption[16];
92 uchar client_response[16];
93 DATA_BLOB client_key_data;
95 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 (%lu)\n",
106 (unsigned long)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) {
124 *user_sess_key = data_blob(NULL, 16);
125 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
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 * Check a challenge-response password against the value of the NT or
148 * @param mem_ctx talloc context
149 * @param challenge 8-byte challenge. If all zero, forces plaintext comparison
150 * @param nt_response 'unicode' NT response to the challenge, or unicode password
151 * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
152 * @param username internal Samba username, for log messages
153 * @param client_username username the client used
154 * @param client_domain domain name the client used (may be mapped)
155 * @param nt_pw MD4 unicode password from our passdb or similar
156 * @param lm_pw LANMAN ASCII password from our passdb or similar
157 * @param user_sess_key User session key
158 * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
161 static NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
162 const DATA_BLOB *challenge,
163 const DATA_BLOB *lm_response,
164 const DATA_BLOB *nt_response,
165 const char *username,
166 const char *client_username,
167 const char *client_domain,
168 const uint8 *lm_pw, const uint8 *nt_pw,
169 DATA_BLOB *user_sess_key,
170 DATA_BLOB *lm_sess_key)
172 static const unsigned char zeros[8];
174 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
178 /* Check for cleartext netlogon. Used by Exchange 5.5. */
179 if (challenge->length == sizeof(zeros) &&
180 (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
182 DEBUG(4,("sam_password_ok: checking plaintext passwords for user %s\n",
184 if (nt_pw && nt_response->length) {
185 unsigned char pwhash[16];
186 mdfour(pwhash, nt_response->data, nt_response->length);
187 if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
190 DEBUG(3,("sam_password_ok: NT (Unicode) plaintext password check failed for user %s\n",
192 return NT_STATUS_WRONG_PASSWORD;
195 } else if (!lp_lanman_auth()) {
196 DEBUG(3,("sam_password_ok: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
199 } else if (lm_pw && lm_response->length) {
204 DEBUG(100, ("DOS password: %s\n"));
205 memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
206 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
207 E_P16((const unsigned char *)dospwd, p16);
209 dump_data_pw("DOS password (first buffer)\n", dospwd, 14);
210 dump_data_pw("DOS password (wire DES hash)\n", p16, 16);
211 dump_data_pw("DOS password (passdb DES hash)\n", lm_pw, 16);
212 if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
215 DEBUG(3,("sam_password_ok: LANMAN (ASCII) plaintext password check failed for user %s\n",
217 return NT_STATUS_WRONG_PASSWORD;
220 DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
221 return NT_STATUS_WRONG_PASSWORD;
225 if (nt_response->length != 0 && nt_response->length < 24) {
226 DEBUG(2,("sam_password_ok: invalid NT password length (%lu) for user %s\n",
227 (unsigned long)nt_response->length, username));
230 if (nt_response->length >= 24 && nt_pw) {
231 if (nt_response->length > 24) {
232 /* We have the NT MD4 hash challenge available - see if we can
233 use it (ie. does it exist in the smbpasswd file).
235 DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", client_domain));
236 if (smb_pwd_check_ntlmv2( nt_response,
244 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
245 if (smb_pwd_check_ntlmv2( nt_response,
252 DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
253 return NT_STATUS_WRONG_PASSWORD;
257 if (lp_ntlm_auth()) {
258 /* We have the NT MD4 hash challenge available - see if we can
259 use it (ie. does it exist in the smbpasswd file).
261 DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
262 if (smb_pwd_check_ntlmv1(nt_response,
265 /* The LM session key for this response is not very secure,
266 so use it only if we otherwise allow LM authentication */
268 if (lp_lanman_auth() && lm_pw) {
269 uint8 first_8_lm_hash[16];
270 memcpy(first_8_lm_hash, lm_pw, 8);
271 memset(first_8_lm_hash + 8, '\0', 8);
272 *lm_sess_key = data_blob(first_8_lm_hash, 16);
276 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",
278 return NT_STATUS_WRONG_PASSWORD;
281 DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",
283 /* no return, becouse we might pick up LMv2 in the LM field */
287 if (lm_response->length == 0) {
288 DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",
290 return NT_STATUS_WRONG_PASSWORD;
293 if (lm_response->length < 24) {
294 DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n",
295 (unsigned long)nt_response->length, username));
296 return NT_STATUS_WRONG_PASSWORD;
299 if (!lp_lanman_auth()) {
300 DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",
303 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",
306 DEBUG(4,("sam_password_ok: Checking LM password\n"));
307 if (smb_pwd_check_ntlmv1(lm_response,
310 uint8 first_8_lm_hash[16];
311 memcpy(first_8_lm_hash, lm_pw, 8);
312 memset(first_8_lm_hash + 8, '\0', 8);
313 *user_sess_key = data_blob(first_8_lm_hash, 16);
314 *lm_sess_key = data_blob(first_8_lm_hash, 16);
320 DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",username));
321 return NT_STATUS_WRONG_PASSWORD;
324 /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
325 - related to Win9X, legacy NAS pass-though authentication
327 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", client_domain));
328 if (smb_pwd_check_ntlmv2( lm_response,
336 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
337 if (smb_pwd_check_ntlmv2( lm_response,
345 /* Apparently NT accepts NT responses in the LM field
346 - I think this is related to Win9X pass-though authentication
348 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
349 if (lp_ntlm_auth()) {
350 if (smb_pwd_check_ntlmv1(lm_response,
353 /* The session key for this response is still very odd.
354 It not very secure, so use it only if we otherwise
355 allow LM authentication */
357 if (lp_lanman_auth() && lm_pw) {
358 uint8 first_8_lm_hash[16];
359 memcpy(first_8_lm_hash, lm_pw, 8);
360 memset(first_8_lm_hash + 8, '\0', 8);
361 *user_sess_key = data_blob(first_8_lm_hash, 16);
362 *lm_sess_key = data_blob(first_8_lm_hash, 16);
366 DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
368 DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
370 return NT_STATUS_WRONG_PASSWORD;
373 /****************************************************************************
374 Do a specific test for an smb password being correct, given a smb_password and
375 the lanman and NT responses.
376 ****************************************************************************/
378 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
380 SAM_ACCOUNT *sampass,
381 const auth_usersupplied_info *user_info,
382 DATA_BLOB *user_sess_key,
383 DATA_BLOB *lm_sess_key)
386 const uint8 *lm_pw, *nt_pw;
387 const char *username = pdb_get_username(sampass);
389 acct_ctrl = pdb_get_acct_ctrl(sampass);
390 if (acct_ctrl & ACB_PWNOTREQ) {
391 if (lp_null_passwords()) {
392 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
395 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
396 return NT_STATUS_LOGON_FAILURE;
400 lm_pw = pdb_get_lanman_passwd(sampass);
401 nt_pw = pdb_get_nt_passwd(sampass);
403 return ntlm_password_check(mem_ctx, &auth_context->challenge,
404 &user_info->lm_resp, &user_info->nt_resp,
406 user_info->smb_name.str,
407 user_info->client_domain.str,
408 lm_pw, nt_pw, user_sess_key, lm_sess_key);
412 /****************************************************************************
413 Do a specific test for a SAM_ACCOUNT being vaild for this connection
414 (ie not disabled, expired and the like).
415 ****************************************************************************/
417 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
418 SAM_ACCOUNT *sampass,
419 const auth_usersupplied_info *user_info)
421 uint16 acct_ctrl = pdb_get_acct_ctrl(sampass);
422 char *workstation_list;
425 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
427 /* Quit if the account was disabled. */
428 if (acct_ctrl & ACB_DISABLED) {
429 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
430 return NT_STATUS_ACCOUNT_DISABLED;
433 /* Quit if the account was locked out. */
434 if (acct_ctrl & ACB_AUTOLOCK) {
435 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
436 return NT_STATUS_ACCOUNT_LOCKED_OUT;
439 /* Test account expire time */
441 kickoff_time = pdb_get_kickoff_time(sampass);
442 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
443 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
444 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
445 return NT_STATUS_ACCOUNT_EXPIRED;
448 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
449 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
450 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
452 /* check for immediate expiry "must change at next logon" */
453 if (must_change_time == 0 && last_set_time != 0) {
454 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
455 return NT_STATUS_PASSWORD_MUST_CHANGE;
458 /* check for expired password */
459 if (must_change_time < time(NULL) && must_change_time != 0) {
460 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
461 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
462 return NT_STATUS_PASSWORD_EXPIRED;
466 /* Test workstation. Workstation list is comma separated. */
468 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
469 if (!workstation_list)
470 return NT_STATUS_NO_MEMORY;
472 if (*workstation_list) {
473 BOOL invalid_ws = True;
474 const char *s = workstation_list;
478 while (next_token(&s, tok, ",", sizeof(tok))) {
479 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
480 tok, user_info->wksta_name.str, user_info->wksta_name.len));
481 if(strequal(tok, user_info->wksta_name.str)) {
488 return NT_STATUS_INVALID_WORKSTATION;
491 if (acct_ctrl & ACB_DOMTRUST) {
492 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
493 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
496 if (acct_ctrl & ACB_SVRTRUST) {
497 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
498 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
501 if (acct_ctrl & ACB_WSTRUST) {
502 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
503 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
509 /****************************************************************************
510 check if a username/password is OK assuming the password is a 24 byte
511 SMB hash supplied in the user_info structure
512 return an NT_STATUS constant.
513 ****************************************************************************/
515 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
516 void *my_private_data,
518 const auth_usersupplied_info *user_info,
519 auth_serversupplied_info **server_info)
521 SAM_ACCOUNT *sampass=NULL;
524 DATA_BLOB user_sess_key = data_blob(NULL, 0);
525 DATA_BLOB lm_sess_key = data_blob(NULL, 0);
527 if (!user_info || !auth_context) {
528 return NT_STATUS_UNSUCCESSFUL;
531 /* Can't use the talloc version here, because the returned struct gets
532 kept on the server_info */
533 if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
537 /* get the account information */
540 ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
544 DEBUG(3,("check_sam_security: Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
545 pdb_free_sam(&sampass);
546 return NT_STATUS_NO_SUCH_USER;
549 nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
550 user_info, &user_sess_key, &lm_sess_key);
552 if (!NT_STATUS_IS_OK(nt_status)) {
553 pdb_free_sam(&sampass);
557 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
559 if (!NT_STATUS_IS_OK(nt_status)) {
560 pdb_free_sam(&sampass);
564 if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
565 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
569 (*server_info)->nt_session_key = user_sess_key;
570 (*server_info)->lm_session_key = lm_sess_key;
575 /* module initialisation */
576 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
578 if (!make_auth_methods(auth_context, auth_method)) {
579 return NT_STATUS_NO_MEMORY;
582 (*auth_method)->auth = check_sam_security;
583 (*auth_method)->name = "sam_ignoredomain";
588 /****************************************************************************
589 Check SAM security (above) but with a few extra checks.
590 ****************************************************************************/
592 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
593 void *my_private_data,
595 const auth_usersupplied_info *user_info,
596 auth_serversupplied_info **server_info)
598 BOOL is_local_name, is_my_domain;
600 if (!user_info || !auth_context) {
601 return NT_STATUS_LOGON_FAILURE;
604 is_local_name = is_myname(user_info->domain.str);
605 is_my_domain = strequal(user_info->domain.str, lp_workgroup());
607 /* check whether or not we service this domain/workgroup name */
609 switch ( lp_server_role() ) {
610 case ROLE_STANDALONE:
611 case ROLE_DOMAIN_MEMBER:
612 if ( !is_local_name ) {
613 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
614 user_info->domain.str, (lp_server_role() == ROLE_DOMAIN_MEMBER
615 ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
616 return NT_STATUS_NOT_IMPLEMENTED;
618 case ROLE_DOMAIN_PDC:
619 case ROLE_DOMAIN_BDC:
620 if ( !is_local_name && !is_my_domain ) {
621 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
622 user_info->domain.str));
623 return NT_STATUS_NOT_IMPLEMENTED;
625 default: /* name is ok */
629 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
632 /* module initialisation */
633 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
635 if (!make_auth_methods(auth_context, auth_method)) {
636 return NT_STATUS_NO_MEMORY;
639 (*auth_method)->auth = check_samstrict_security;
640 (*auth_method)->name = "sam";
644 NTSTATUS auth_sam_init(void)
646 smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
647 smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);