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);
76 /****************************************************************************
77 core of smb password checking routine.
78 ****************************************************************************/
79 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB ntv2_response,
80 const uchar *part_passwd,
81 const DATA_BLOB sec_blob,
82 const char *user, const char *domain,
83 uint8 user_sess_key[16])
85 /* Finish the encryption of part_passwd. */
87 uchar value_from_encryption[16];
88 uchar client_response[16];
89 DATA_BLOB client_key_data;
91 if (part_passwd == NULL)
93 DEBUG(10,("No password set - DISALLOWING access\n"));
94 /* No password set - always False */
98 if (ntv2_response.length < 16) {
99 /* We MUST have more than 16 bytes, or the stuff below will go
101 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n",
102 ntv2_response.length));
106 client_key_data = data_blob(ntv2_response.data+16, ntv2_response.length-16);
107 memcpy(client_response, ntv2_response.data, sizeof(client_response));
109 if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
113 SMBOWFencrypt_ntv2(kr, sec_blob, client_key_data, value_from_encryption);
114 if (user_sess_key != NULL)
116 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
120 DEBUG(100,("Part password (P16) was |"));
121 dump_data(100, part_passwd, 16);
122 DEBUG(100,("Password from client was |"));
123 dump_data(100, ntv2_response.data, ntv2_response.length);
124 DEBUG(100,("Variable data from client was |"));
125 dump_data(100, client_key_data.data, client_key_data.length);
126 DEBUG(100,("Given challenge was |"));
127 dump_data(100, sec_blob.data, sec_blob.length);
128 DEBUG(100,("Value from encryption was |"));
129 dump_data(100, value_from_encryption, 16);
131 data_blob_clear_free(&client_key_data);
132 return (memcmp(value_from_encryption, client_response, 16) == 0);
136 /****************************************************************************
137 Do a specific test for an smb password being correct, given a smb_password and
138 the lanman and NT responses.
139 ****************************************************************************/
140 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
142 SAM_ACCOUNT *sampass,
143 const auth_usersupplied_info *user_info,
144 uint8 user_sess_key[16])
147 const uint8 *nt_pw, *lm_pw;
150 acct_ctrl = pdb_get_acct_ctrl(sampass);
151 if (acct_ctrl & ACB_PWNOTREQ)
153 if (lp_null_passwords())
155 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
156 return(NT_STATUS_OK);
160 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
161 return(NT_STATUS_LOGON_FAILURE);
165 auth_flags = user_info->auth_flags;
167 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
168 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
169 pdb_get_username(sampass)));
170 /* No return, we want to check the LM hash below in this case */
171 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP | AUTH_FLAG_NTLM_RESP));
174 if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
175 nt_pw = pdb_get_nt_passwd(sampass);
176 /* We have the NT MD4 hash challenge available - see if we can
177 use it (ie. does it exist in the smbpasswd file).
179 DEBUG(4,("sam_password_ok: Checking NTLMv2 password\n"));
180 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
181 nt_pw, auth_context->challenge,
182 user_info->smb_name.str,
183 user_info->client_domain.str,
188 DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
189 return NT_STATUS_WRONG_PASSWORD;
191 } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
192 if (lp_ntlm_auth()) {
193 nt_pw = pdb_get_nt_passwd(sampass);
194 /* We have the NT MD4 hash challenge available - see if we can
195 use it (ie. does it exist in the smbpasswd file).
197 DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
198 if (smb_pwd_check_ntlmv1(user_info->nt_resp,
199 nt_pw, auth_context->challenge,
204 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
205 return NT_STATUS_WRONG_PASSWORD;
208 DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
209 /* No return, we want to check the LM hash below in this case */
213 if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
214 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
215 auth_flags &= (~AUTH_FLAG_LM_RESP);
218 if (auth_flags & AUTH_FLAG_LM_RESP) {
219 lm_pw = pdb_get_lanman_passwd(sampass);
221 if (user_info->lm_resp.length != 24) {
222 DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
223 user_info->nt_resp.length, pdb_get_username(sampass)));
226 if (!lp_lanman_auth()) {
227 DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
228 return NT_STATUS_LOGON_FAILURE;
231 DEBUG(4,("sam_password_ok: Checking LM password\n"));
232 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
233 lm_pw, auth_context->challenge,
238 if (lp_ntlm_auth() && (!IS_SAM_DEFAULT(sampass, PDB_NTPASSWD))) {
239 nt_pw = pdb_get_nt_passwd(sampass);
240 /* Apparently NT accepts NT responses in the LM field
241 - I think this is related to Win9X pass-though authentication
243 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
244 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
245 nt_pw, auth_context->challenge,
250 DEBUG(3,("sam_password_ok: NT MD4 password in LM field failed for user %s\n",pdb_get_username(sampass)));
251 return NT_STATUS_WRONG_PASSWORD;
254 DEBUG(4,("sam_password_ok: LM password check failed for user %s\n",pdb_get_username(sampass)));
255 return NT_STATUS_WRONG_PASSWORD;
259 /* Should not be reached, but if they send nothing... */
260 DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
261 return NT_STATUS_WRONG_PASSWORD;
264 /****************************************************************************
265 Do a specific test for a SAM_ACCOUNT being vaild for this connection
266 (ie not disabled, expired and the like).
267 ****************************************************************************/
268 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
269 SAM_ACCOUNT *sampass,
270 const auth_usersupplied_info *user_info)
272 uint16 acct_ctrl = pdb_get_acct_ctrl(sampass);
273 char *workstation_list;
276 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
278 /* Quit if the account was disabled. */
279 if (acct_ctrl & ACB_DISABLED) {
280 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
281 return NT_STATUS_ACCOUNT_DISABLED;
284 /* Test account expire time */
286 kickoff_time = pdb_get_kickoff_time(sampass);
287 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
288 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
289 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
290 return NT_STATUS_ACCOUNT_EXPIRED;
293 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
294 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
295 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
297 /* check for immediate expiry "must change at next logon" */
298 if (must_change_time == 0 && last_set_time != 0) {
299 DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
300 return NT_STATUS_PASSWORD_MUST_CHANGE;
303 /* check for expired password */
304 if (must_change_time < time(NULL) && must_change_time != 0) {
305 DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
306 DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
307 return NT_STATUS_PASSWORD_EXPIRED;
311 /* Test workstation. Workstation list is comma separated. */
313 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
315 if (!workstation_list) return NT_STATUS_NO_MEMORY;
317 if (*workstation_list) {
318 BOOL invalid_ws = True;
319 const char *s = workstation_list;
323 while (next_token(&s, tok, ",", sizeof(tok))) {
324 DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
325 tok, user_info->wksta_name.str, user_info->wksta_name.len));
326 if(strequal(tok, user_info->wksta_name.str)) {
333 return NT_STATUS_INVALID_WORKSTATION;
336 if (acct_ctrl & ACB_DOMTRUST) {
337 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
338 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
341 if (acct_ctrl & ACB_SVRTRUST) {
342 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
343 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
346 if (acct_ctrl & ACB_WSTRUST) {
347 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
348 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
355 /****************************************************************************
356 check if a username/password is OK assuming the password is a 24 byte
357 SMB hash supplied in the user_info structure
358 return an NT_STATUS constant.
359 ****************************************************************************/
361 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
362 void *my_private_data,
364 const auth_usersupplied_info *user_info,
365 auth_serversupplied_info **server_info)
367 SAM_ACCOUNT *sampass=NULL;
370 uint8 user_sess_key[16];
371 const uint8* lm_hash;
373 if (!user_info || !auth_context) {
374 return NT_STATUS_UNSUCCESSFUL;
377 /* Can't use the talloc version here, becouse the returned struct gets
378 kept on the server_info */
379 if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
383 /* get the account information */
386 ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
391 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
392 pdb_free_sam(&sampass);
393 return NT_STATUS_NO_SUCH_USER;
396 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
398 nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
400 if (!NT_STATUS_IS_OK(nt_status)) {
401 pdb_free_sam(&sampass);
405 if (!NT_STATUS_IS_OK(nt_status)) {
406 pdb_free_sam(&sampass);
410 if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
411 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
415 lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
417 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
420 memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
425 /* module initialisation */
426 NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
428 if (!make_auth_methods(auth_context, auth_method)) {
429 return NT_STATUS_NO_MEMORY;
432 (*auth_method)->auth = check_sam_security;
433 (*auth_method)->name = "sam";
438 /****************************************************************************
439 Check SAM security (above) but with a few extra checks.
440 ****************************************************************************/
442 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
443 void *my_private_data,
445 const auth_usersupplied_info *user_info,
446 auth_serversupplied_info **server_info)
449 if (!user_info || !auth_context) {
450 return NT_STATUS_LOGON_FAILURE;
453 /* If we are a domain member, we must not
454 attempt to check the password locally,
455 unless it is one of our aliases. */
457 if (!is_myname(user_info->domain.str)) {
458 return NT_STATUS_NO_SUCH_USER;
461 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
464 /* module initialisation */
465 NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
467 if (!make_auth_methods(auth_context, auth_method)) {
468 return NT_STATUS_NO_MEMORY;
471 (*auth_method)->auth = check_samstrict_security;
472 (*auth_method)->name = "samstrict";