s3:auth:check_sam_security: create (and use) a common exit point
[Samba.git] / source3 / auth / auth_sam.c
blobdd4a465e7d515c78af8dc3b9fb76e8007c4fd3fb
1 /*
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 2001-2003
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 3 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, see <http://www.gnu.org/licenses/>.
23 #include "includes.h"
24 #include "../libcli/auth/libcli_auth.h"
26 #undef DBGC_CLASS
27 #define DBGC_CLASS DBGC_AUTH
29 /****************************************************************************
30 Do a specific test for an smb password being correct, given a smb_password and
31 the lanman and NT responses.
32 ****************************************************************************/
34 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
35 TALLOC_CTX *mem_ctx,
36 const char *username,
37 uint32_t acct_ctrl,
38 const uint8_t *lm_pw,
39 const uint8_t *nt_pw,
40 const auth_usersupplied_info *user_info,
41 DATA_BLOB *user_sess_key,
42 DATA_BLOB *lm_sess_key)
44 struct samr_Password _lm_hash, _nt_hash, _client_lm_hash, _client_nt_hash;
45 struct samr_Password *lm_hash = NULL;
46 struct samr_Password *nt_hash = NULL;
47 struct samr_Password *client_lm_hash = NULL;
48 struct samr_Password *client_nt_hash = NULL;
50 *user_sess_key = data_blob_null;
51 *lm_sess_key = data_blob_null;
53 if (acct_ctrl & ACB_PWNOTREQ) {
54 if (lp_null_passwords()) {
55 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
56 return NT_STATUS_OK;
57 } else {
58 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
59 return NT_STATUS_LOGON_FAILURE;
63 if (lm_pw) {
64 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
65 lm_hash = &_lm_hash;
67 if (nt_pw) {
68 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
69 nt_hash = &_nt_hash;
71 if (user_info->lm_interactive_pwd.data && sizeof(_client_lm_hash.hash) == user_info->lm_interactive_pwd.length) {
72 memcpy(_client_lm_hash.hash, user_info->lm_interactive_pwd.data, sizeof(_lm_hash.hash));
73 client_lm_hash = &_client_lm_hash;
75 if (user_info->nt_interactive_pwd.data && sizeof(_client_nt_hash.hash) == user_info->nt_interactive_pwd.length) {
76 memcpy(_client_nt_hash.hash, user_info->nt_interactive_pwd.data, sizeof(_nt_hash.hash));
77 client_nt_hash = &_client_nt_hash;
80 if (client_lm_hash || client_nt_hash) {
81 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
82 if (!user_sess_key->data) {
83 return NT_STATUS_NO_MEMORY;
85 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
86 return hash_password_check(mem_ctx, lp_lanman_auth(),
87 client_lm_hash,
88 client_nt_hash,
89 username,
90 lm_hash,
91 nt_hash);
92 } else {
93 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
94 lp_ntlm_auth(),
95 user_info->logon_parameters,
96 &auth_context->challenge,
97 &user_info->lm_resp, &user_info->nt_resp,
98 username,
99 user_info->smb_name,
100 user_info->client_domain,
101 lm_hash,
102 nt_hash,
103 user_sess_key, lm_sess_key);
107 /****************************************************************************
108 Check if a user is allowed to logon at this time. Note this is the
109 servers local time, as logon hours are just specified as a weekly
110 bitmask.
111 ****************************************************************************/
113 static bool logon_hours_ok(struct samu *sampass)
115 /* In logon hours first bit is Sunday from 12AM to 1AM */
116 const uint8 *hours;
117 struct tm *utctime;
118 time_t lasttime;
119 const char *asct;
120 uint8 bitmask, bitpos;
122 hours = pdb_get_hours(sampass);
123 if (!hours) {
124 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
125 return True;
128 lasttime = time(NULL);
129 utctime = gmtime(&lasttime);
130 if (!utctime) {
131 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
132 pdb_get_username(sampass) ));
133 return False;
136 /* find the corresponding byte and bit */
137 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
138 bitmask = 1 << (bitpos % 8);
140 if (! (hours[bitpos/8] & bitmask)) {
141 struct tm *t = localtime(&lasttime);
142 if (!t) {
143 asct = "INVALID TIME";
144 } else {
145 asct = asctime(t);
146 if (!asct) {
147 asct = "INVALID TIME";
151 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
152 "logon at this time (%s).\n",
153 pdb_get_username(sampass), asct ));
154 return False;
157 asct = asctime(utctime);
158 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
159 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
161 return True;
164 /****************************************************************************
165 Do a specific test for a struct samu being valid for this connection
166 (ie not disabled, expired and the like).
167 ****************************************************************************/
169 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
170 struct samu *sampass,
171 const auth_usersupplied_info *user_info)
173 uint32 acct_ctrl = pdb_get_acct_ctrl(sampass);
174 char *workstation_list;
175 time_t kickoff_time;
177 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
179 /* Quit if the account was disabled. */
180 if (acct_ctrl & ACB_DISABLED) {
181 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
182 return NT_STATUS_ACCOUNT_DISABLED;
185 /* Quit if the account was locked out. */
186 if (acct_ctrl & ACB_AUTOLOCK) {
187 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
188 return NT_STATUS_ACCOUNT_LOCKED_OUT;
191 /* Quit if the account is not allowed to logon at this time. */
192 if (! logon_hours_ok(sampass)) {
193 return NT_STATUS_INVALID_LOGON_HOURS;
196 /* Test account expire time */
198 kickoff_time = pdb_get_kickoff_time(sampass);
199 if (kickoff_time != 0 && time(NULL) > kickoff_time) {
200 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
201 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
202 return NT_STATUS_ACCOUNT_EXPIRED;
205 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
206 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
207 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
209 /* check for immediate expiry "must change at next logon"
210 * for a user account. */
211 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
212 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
213 return NT_STATUS_PASSWORD_MUST_CHANGE;
216 /* check for expired password */
217 if (must_change_time < time(NULL) && must_change_time != 0) {
218 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
219 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
220 return NT_STATUS_PASSWORD_EXPIRED;
224 /* Test workstation. Workstation list is comma separated. */
226 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
227 if (!workstation_list)
228 return NT_STATUS_NO_MEMORY;
230 if (*workstation_list) {
231 bool invalid_ws = True;
232 char *tok = NULL;
233 const char *s = workstation_list;
234 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
236 if (machine_name == NULL)
237 return NT_STATUS_NO_MEMORY;
239 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
240 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
241 tok, user_info->wksta_name));
242 if(strequal(tok, user_info->wksta_name)) {
243 invalid_ws = False;
244 break;
246 if (tok[0] == '+') {
247 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
248 machine_name, tok + 1));
249 if (user_in_group(machine_name, tok + 1)) {
250 invalid_ws = False;
251 break;
254 TALLOC_FREE(tok);
256 TALLOC_FREE(tok);
257 TALLOC_FREE(machine_name);
259 if (invalid_ws)
260 return NT_STATUS_INVALID_WORKSTATION;
263 if (acct_ctrl & ACB_DOMTRUST) {
264 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
265 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
268 if (acct_ctrl & ACB_SVRTRUST) {
269 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
270 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
271 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
275 if (acct_ctrl & ACB_WSTRUST) {
276 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
277 DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
278 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
281 return NT_STATUS_OK;
284 /****************************************************************************
285 check if a username/password is OK assuming the password is a 24 byte
286 SMB hash supplied in the user_info structure
287 return an NT_STATUS constant.
288 ****************************************************************************/
290 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
291 void *my_private_data,
292 TALLOC_CTX *mem_ctx,
293 const auth_usersupplied_info *user_info,
294 auth_serversupplied_info **server_info)
296 struct samu *sampass=NULL;
297 bool ret;
298 NTSTATUS nt_status;
299 NTSTATUS update_login_attempts_status;
300 DATA_BLOB user_sess_key = data_blob_null;
301 DATA_BLOB lm_sess_key = data_blob_null;
302 bool updated_autolock = False, updated_badpw = False;
303 uint32_t acct_ctrl;
304 const char *username;
305 const uint8_t *nt_pw;
306 const uint8_t *lm_pw;
308 if (!user_info || !auth_context) {
309 return NT_STATUS_UNSUCCESSFUL;
312 /* the returned struct gets kept on the server_info, by means
313 of a steal further down */
315 sampass = samu_new(mem_ctx);
316 if (sampass == NULL) {
317 return NT_STATUS_NO_MEMORY;
320 /* get the account information */
322 become_root();
323 ret = pdb_getsampwnam(sampass, user_info->internal_username);
324 unbecome_root();
326 if (ret == False) {
327 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
328 "passdb.\n", user_info->internal_username));
329 TALLOC_FREE(sampass);
330 return NT_STATUS_NO_SUCH_USER;
333 acct_ctrl = pdb_get_acct_ctrl(sampass);
334 username = pdb_get_username(sampass);
335 nt_pw = pdb_get_nt_passwd(sampass);
336 lm_pw = pdb_get_lanman_passwd(sampass);
338 /* see if autolock flag needs to be updated */
339 if (acct_ctrl & ACB_NORMAL)
340 pdb_update_autolock_flag(sampass, &updated_autolock);
341 /* Quit if the account was locked out. */
342 if (acct_ctrl & ACB_AUTOLOCK) {
343 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username));
344 return NT_STATUS_ACCOUNT_LOCKED_OUT;
347 nt_status = sam_password_ok(auth_context, mem_ctx,
348 username, acct_ctrl, lm_pw, nt_pw,
349 user_info, &user_sess_key, &lm_sess_key);
351 /* Notify passdb backend of login success/failure. If not
352 NT_STATUS_OK the backend doesn't like the login */
354 update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
356 if (!NT_STATUS_IS_OK(nt_status)) {
357 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
358 acct_ctrl & ACB_NORMAL &&
359 NT_STATUS_IS_OK(update_login_attempts_status))
361 pdb_increment_bad_password_count(sampass);
362 updated_badpw = True;
363 } else {
364 pdb_update_bad_password_count(sampass,
365 &updated_badpw);
367 if (updated_autolock || updated_badpw){
368 become_root();
369 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
370 DEBUG(1, ("Failed to modify entry.\n"));
371 unbecome_root();
373 goto done;
376 if ((acct_ctrl & ACB_NORMAL) &&
377 (pdb_get_bad_password_count(sampass) > 0)){
378 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
379 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
380 updated_badpw = True;
383 if (updated_autolock || updated_badpw){
384 become_root();
385 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
386 DEBUG(1, ("Failed to modify entry.\n"));
387 unbecome_root();
390 nt_status = sam_account_ok(mem_ctx, sampass, user_info);
392 if (!NT_STATUS_IS_OK(nt_status)) {
393 goto done;
396 become_root();
397 nt_status = make_server_info_sam(server_info, sampass);
398 unbecome_root();
399 sampass = NULL;
401 if (!NT_STATUS_IS_OK(nt_status)) {
402 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
403 goto done;
406 (*server_info)->user_session_key =
407 data_blob_talloc(*server_info, user_sess_key.data,
408 user_sess_key.length);
409 data_blob_free(&user_sess_key);
411 (*server_info)->lm_session_key =
412 data_blob_talloc(*server_info, lm_sess_key.data,
413 lm_sess_key.length);
414 data_blob_free(&lm_sess_key);
416 (*server_info)->nss_token |= user_info->was_mapped;
418 done:
419 TALLOC_FREE(sampass);
420 data_blob_free(&user_sess_key);
421 data_blob_free(&lm_sess_key);
422 return nt_status;
425 /* module initialisation */
426 static NTSTATUS auth_init_sam_ignoredomain(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_ignoredomain";
434 return NT_STATUS_OK;
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,
444 TALLOC_CTX *mem_ctx,
445 const auth_usersupplied_info *user_info,
446 auth_serversupplied_info **server_info)
448 bool is_local_name, is_my_domain;
450 if (!user_info || !auth_context) {
451 return NT_STATUS_LOGON_FAILURE;
454 is_local_name = is_myname(user_info->domain);
455 is_my_domain = strequal(user_info->domain, lp_workgroup());
457 /* check whether or not we service this domain/workgroup name */
459 switch ( lp_server_role() ) {
460 case ROLE_STANDALONE:
461 case ROLE_DOMAIN_MEMBER:
462 if ( !is_local_name ) {
463 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
464 user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER
465 ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
466 return NT_STATUS_NOT_IMPLEMENTED;
468 case ROLE_DOMAIN_PDC:
469 case ROLE_DOMAIN_BDC:
470 if ( !is_local_name && !is_my_domain ) {
471 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
472 user_info->domain));
473 return NT_STATUS_NOT_IMPLEMENTED;
475 default: /* name is ok */
476 break;
479 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
482 /* module initialisation */
483 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
485 if (!make_auth_methods(auth_context, auth_method)) {
486 return NT_STATUS_NO_MEMORY;
489 (*auth_method)->auth = check_samstrict_security;
490 (*auth_method)->name = "sam";
491 return NT_STATUS_OK;
494 NTSTATUS auth_sam_init(void)
496 smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
497 smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
498 return NT_STATUS_OK;