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 8 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. 13 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. 18 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/>. 21*/ 22 23#include "includes.h" 24#include "../libcli/auth/libcli_auth.h" 25 26#undef DBGC_CLASS 27#define DBGC_CLASS DBGC_AUTH 28 29/**************************************************************************** 30 Do a specific test for an smb password being correct, given a smb_password and 31 the lanman and NT responses. 32****************************************************************************/ 33 34static 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) 43{ 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; 49 50 *user_sess_key = data_blob_null; 51 *lm_sess_key = data_blob_null; 52 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; 60 } 61 } 62 63 if (lm_pw) { 64 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash)); 65 lm_hash = &_lm_hash; 66 } 67 if (nt_pw) { 68 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash)); 69 nt_hash = &_nt_hash; 70 } 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; 74 } 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; 78 } 79 80 if (client_lm_hash || client_nt_hash) { 81 if (!nt_pw) { 82 return NT_STATUS_WRONG_PASSWORD; 83 } 84 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16); 85 if (!user_sess_key->data) { 86 return NT_STATUS_NO_MEMORY; 87 } 88 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data); 89 return hash_password_check(mem_ctx, lp_lanman_auth(), 90 client_lm_hash, 91 client_nt_hash, 92 username, 93 lm_hash, 94 nt_hash); 95 } else { 96 return ntlm_password_check(mem_ctx, lp_lanman_auth(), 97 lp_ntlm_auth(), 98 user_info->logon_parameters, 99 &auth_context->challenge, 100 &user_info->lm_resp, &user_info->nt_resp, 101 username, 102 user_info->smb_name, 103 user_info->client_domain, 104 lm_hash, 105 nt_hash, 106 user_sess_key, lm_sess_key); 107 } 108} 109 110/**************************************************************************** 111 Check if a user is allowed to logon at this time. Note this is the 112 servers local time, as logon hours are just specified as a weekly 113 bitmask. 114****************************************************************************/ 115 116static bool logon_hours_ok(struct samu *sampass) 117{ 118 /* In logon hours first bit is Sunday from 12AM to 1AM */ 119 const uint8 *hours; 120 struct tm *utctime; 121 time_t lasttime; 122 const char *asct; 123 uint8 bitmask, bitpos; 124 125 hours = pdb_get_hours(sampass); 126 if (!hours) { 127 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass))); 128 return True; 129 } 130 131 lasttime = time(NULL); 132 utctime = gmtime(&lasttime); 133 if (!utctime) { 134 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n", 135 pdb_get_username(sampass) )); 136 return False; 137 } 138 139 /* find the corresponding byte and bit */ 140 bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168; 141 bitmask = 1 << (bitpos % 8); 142 143 if (! (hours[bitpos/8] & bitmask)) { 144 struct tm *t = localtime(&lasttime); 145 if (!t) { 146 asct = "INVALID TIME"; 147 } else { 148 asct = asctime(t); 149 if (!asct) { 150 asct = "INVALID TIME"; 151 } 152 } 153 154 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to " 155 "logon at this time (%s).\n", 156 pdb_get_username(sampass), asct )); 157 return False; 158 } 159 160 asct = asctime(utctime); 161 DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n", 162 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" )); 163 164 return True; 165} 166 167/**************************************************************************** 168 Do a specific test for a struct samu being valid for this connection 169 (ie not disabled, expired and the like). 170****************************************************************************/ 171 172static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx, 173 struct samu *sampass, 174 const auth_usersupplied_info *user_info) 175{ 176 uint32 acct_ctrl = pdb_get_acct_ctrl(sampass); 177 char *workstation_list; 178 time_t kickoff_time; 179 180 DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass))); 181 182 /* Quit if the account was disabled. */ 183 if (acct_ctrl & ACB_DISABLED) { 184 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass))); 185 return NT_STATUS_ACCOUNT_DISABLED; 186 } 187 188 /* Quit if the account was locked out. */ 189 if (acct_ctrl & ACB_AUTOLOCK) { 190 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass))); 191 return NT_STATUS_ACCOUNT_LOCKED_OUT; 192 } 193 194 /* Quit if the account is not allowed to logon at this time. */ 195 if (! logon_hours_ok(sampass)) { 196 return NT_STATUS_INVALID_LOGON_HOURS; 197 } 198 199 /* Test account expire time */ 200 201 kickoff_time = pdb_get_kickoff_time(sampass); 202 if (kickoff_time != 0 && time(NULL) > kickoff_time) { 203 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass))); 204 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time)); 205 return NT_STATUS_ACCOUNT_EXPIRED; 206 } 207 208 if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) { 209 time_t must_change_time = pdb_get_pass_must_change_time(sampass); 210 time_t last_set_time = pdb_get_pass_last_set_time(sampass); 211 212 /* check for immediate expiry "must change at next logon" 213 * for a user account. */ 214 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) { 215 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass))); 216 return NT_STATUS_PASSWORD_MUST_CHANGE; 217 } 218 219 /* check for expired password */ 220 if (must_change_time < time(NULL) && must_change_time != 0) { 221 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass))); 222 DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time)); 223 return NT_STATUS_PASSWORD_EXPIRED; 224 } 225 } 226 227 /* Test workstation. Workstation list is comma separated. */ 228 229 workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass)); 230 if (!workstation_list) 231 return NT_STATUS_NO_MEMORY; 232 233 if (*workstation_list) { 234 bool invalid_ws = True; 235 char *tok = NULL; 236 const char *s = workstation_list; 237 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name); 238 239 if (machine_name == NULL) 240 return NT_STATUS_NO_MEMORY; 241 242 while (next_token_talloc(mem_ctx, &s, &tok, ",")) { 243 DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n", 244 tok, user_info->wksta_name)); 245 if(strequal(tok, user_info->wksta_name)) { 246 invalid_ws = False; 247 break; 248 } 249 if (tok[0] == '+') { 250 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n", 251 machine_name, tok + 1)); 252 if (user_in_group(machine_name, tok + 1)) { 253 invalid_ws = False; 254 break; 255 } 256 } 257 TALLOC_FREE(tok); 258 } 259 TALLOC_FREE(tok); 260 TALLOC_FREE(machine_name); 261 262 if (invalid_ws) 263 return NT_STATUS_INVALID_WORKSTATION; 264 } 265 266 if (acct_ctrl & ACB_DOMTRUST) { 267 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass))); 268 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT; 269 } 270 271 if (acct_ctrl & ACB_SVRTRUST) { 272 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) { 273 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass))); 274 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT; 275 } 276 } 277 278 if (acct_ctrl & ACB_WSTRUST) { 279 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) { 280 DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass))); 281 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT; 282 } 283 } 284 return NT_STATUS_OK; 285} 286 287/** 288 * Check whether the given password is one of the last two 289 * password history entries. If so, the bad pwcount should 290 * not be incremented even thought the actual password check 291 * failed. 292 */ 293static bool need_to_increment_bad_pw_count( 294 const struct auth_context *auth_context, 295 struct samu* sampass, 296 const auth_usersupplied_info *user_info) 297{ 298 uint8_t i; 299 const uint8_t *pwhistory; 300 uint32_t pwhistory_len; 301 uint32_t policy_pwhistory_len; 302 uint32_t acct_ctrl; 303 const char *username; 304 TALLOC_CTX *mem_ctx = talloc_stackframe(); 305 bool result = true; 306 307 pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY, 308 &policy_pwhistory_len); 309 if (policy_pwhistory_len == 0) { 310 goto done; 311 } 312 313 pwhistory = pdb_get_pw_history(sampass, &pwhistory_len); 314 if (!pwhistory || pwhistory_len == 0) { 315 goto done; 316 } 317 318 acct_ctrl = pdb_get_acct_ctrl(sampass); 319 username = pdb_get_username(sampass); 320 321 for (i=1; i < MIN(MIN(3, policy_pwhistory_len), pwhistory_len); i++) { 322 static const uint8_t zero16[SALTED_MD5_HASH_LEN]; 323 const uint8_t *salt; 324 const uint8_t *nt_pw; 325 NTSTATUS status; 326 DATA_BLOB user_sess_key = data_blob_null; 327 DATA_BLOB lm_sess_key = data_blob_null; 328 329 salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN]; 330 nt_pw = salt + PW_HISTORY_SALT_LEN; 331 332 if (memcmp(zero16, nt_pw, NT_HASH_LEN) == 0) { 333 /* skip zero password hash */ 334 continue; 335 } 336 337 if (memcmp(zero16, salt, PW_HISTORY_SALT_LEN) != 0) { 338 /* skip nonzero salt (old format entry) */ 339 continue; 340 } 341 342 status = sam_password_ok(auth_context, mem_ctx, 343 username, acct_ctrl, NULL, nt_pw, 344 user_info, &user_sess_key, &lm_sess_key); 345 if (NT_STATUS_IS_OK(status)) { 346 result = false; 347 break; 348 } 349 } 350 351done: 352 TALLOC_FREE(mem_ctx); 353 return result; 354} 355 356/**************************************************************************** 357check if a username/password is OK assuming the password is a 24 byte 358SMB hash supplied in the user_info structure 359return an NT_STATUS constant. 360****************************************************************************/ 361 362static NTSTATUS check_sam_security(const struct auth_context *auth_context, 363 void *my_private_data, 364 TALLOC_CTX *mem_ctx, 365 const auth_usersupplied_info *user_info, 366 auth_serversupplied_info **server_info) 367{ 368 struct samu *sampass=NULL; 369 bool ret; 370 NTSTATUS nt_status; 371 NTSTATUS update_login_attempts_status; 372 DATA_BLOB user_sess_key = data_blob_null; 373 DATA_BLOB lm_sess_key = data_blob_null; 374 bool updated_autolock = False, updated_badpw = False; 375 const char *username; 376 const uint8_t *nt_pw; 377 const uint8_t *lm_pw; 378 379 if (!user_info || !auth_context) { 380 return NT_STATUS_UNSUCCESSFUL; 381 } 382 383 /* the returned struct gets kept on the server_info, by means 384 of a steal further down */ 385 386 sampass = samu_new(mem_ctx); 387 if (sampass == NULL) { 388 return NT_STATUS_NO_MEMORY; 389 } 390 391 /* get the account information */ 392 393 become_root(); 394 ret = pdb_getsampwnam(sampass, user_info->internal_username); 395 unbecome_root(); 396 397 if (ret == False) { 398 DEBUG(3,("check_sam_security: Couldn't find user '%s' in " 399 "passdb.\n", user_info->internal_username)); 400 TALLOC_FREE(sampass); 401 return NT_STATUS_NO_SUCH_USER; 402 } 403 404 username = pdb_get_username(sampass); 405 nt_pw = pdb_get_nt_passwd(sampass); 406 lm_pw = pdb_get_lanman_passwd(sampass); 407 408 /* see if autolock flag needs to be updated */ 409 if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL) 410 pdb_update_autolock_flag(sampass, &updated_autolock); 411 /* Quit if the account was locked out. */ 412 if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) { 413 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username)); 414 return NT_STATUS_ACCOUNT_LOCKED_OUT; 415 } 416 417 nt_status = sam_password_ok(auth_context, mem_ctx, 418 username, pdb_get_acct_ctrl(sampass), lm_pw, nt_pw, 419 user_info, &user_sess_key, &lm_sess_key); 420 421 /* Notify passdb backend of login success/failure. If not 422 NT_STATUS_OK the backend doesn't like the login */ 423 424 update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status)); 425 426 if (!NT_STATUS_IS_OK(nt_status)) { 427 bool increment_bad_pw_count = false; 428 429 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) && 430 pdb_get_acct_ctrl(sampass) & ACB_NORMAL && 431 NT_STATUS_IS_OK(update_login_attempts_status)) 432 { 433 increment_bad_pw_count = 434 need_to_increment_bad_pw_count(auth_context, 435 sampass, 436 user_info); 437 } 438 439 if (increment_bad_pw_count) { 440 pdb_increment_bad_password_count(sampass); 441 updated_badpw = True; 442 } else { 443 pdb_update_bad_password_count(sampass, 444 &updated_badpw); 445 } 446 if (updated_autolock || updated_badpw){ 447 NTSTATUS status; 448 449 become_root(); 450 status = pdb_update_sam_account(sampass); 451 unbecome_root(); 452 453 if (!NT_STATUS_IS_OK(status)) { 454 DEBUG(1, ("Failed to modify entry: %s\n", 455 nt_errstr(status))); 456 } 457 } 458 goto done; 459 } 460 461 if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) && 462 (pdb_get_bad_password_count(sampass) > 0)){ 463 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED); 464 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED); 465 updated_badpw = True; 466 } 467 468 if (updated_autolock || updated_badpw){ 469 NTSTATUS status; 470 471 become_root(); 472 status = pdb_update_sam_account(sampass); 473 unbecome_root(); 474 475 if (!NT_STATUS_IS_OK(status)) { 476 DEBUG(1, ("Failed to modify entry: %s\n", 477 nt_errstr(status))); 478 } 479 } 480 481 nt_status = sam_account_ok(mem_ctx, sampass, user_info); 482 483 if (!NT_STATUS_IS_OK(nt_status)) { 484 goto done; 485 } 486 487 become_root(); 488 nt_status = make_server_info_sam(server_info, sampass); 489 unbecome_root(); 490 sampass = NULL; 491 492 if (!NT_STATUS_IS_OK(nt_status)) { 493 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status))); 494 goto done; 495 } 496 497 (*server_info)->user_session_key = 498 data_blob_talloc(*server_info, user_sess_key.data, 499 user_sess_key.length); 500 data_blob_free(&user_sess_key); 501 502 (*server_info)->lm_session_key = 503 data_blob_talloc(*server_info, lm_sess_key.data, 504 lm_sess_key.length); 505 data_blob_free(&lm_sess_key); 506 507 (*server_info)->nss_token |= user_info->was_mapped; 508 509done: 510 TALLOC_FREE(sampass); 511 data_blob_free(&user_sess_key); 512 data_blob_free(&lm_sess_key); 513 return nt_status; 514} 515 516/* module initialisation */ 517static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 518{ 519 if (!make_auth_methods(auth_context, auth_method)) { 520 return NT_STATUS_NO_MEMORY; 521 } 522 523 (*auth_method)->auth = check_sam_security; 524 (*auth_method)->name = "sam_ignoredomain"; 525 return NT_STATUS_OK; 526} 527 528 529/**************************************************************************** 530Check SAM security (above) but with a few extra checks. 531****************************************************************************/ 532 533static NTSTATUS check_samstrict_security(const struct auth_context *auth_context, 534 void *my_private_data, 535 TALLOC_CTX *mem_ctx, 536 const auth_usersupplied_info *user_info, 537 auth_serversupplied_info **server_info) 538{ 539 bool is_local_name, is_my_domain; 540 541 if (!user_info || !auth_context) { 542 return NT_STATUS_LOGON_FAILURE; 543 } 544 545 is_local_name = is_myname(user_info->domain); 546 is_my_domain = strequal(user_info->domain, lp_workgroup()); 547 548 /* check whether or not we service this domain/workgroup name */ 549 550 switch ( lp_server_role() ) { 551 case ROLE_STANDALONE: 552 case ROLE_DOMAIN_MEMBER: 553 if ( !is_local_name ) { 554 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n", 555 user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER 556 ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") )); 557 return NT_STATUS_NOT_IMPLEMENTED; 558 } 559 case ROLE_DOMAIN_PDC: 560 case ROLE_DOMAIN_BDC: 561 if ( !is_local_name && !is_my_domain ) { 562 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n", 563 user_info->domain)); 564 return NT_STATUS_NOT_IMPLEMENTED; 565 } 566 default: /* name is ok */ 567 break; 568 } 569 570 return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info); 571} 572 573/* module initialisation */ 574static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 575{ 576 if (!make_auth_methods(auth_context, auth_method)) { 577 return NT_STATUS_NO_MEMORY; 578 } 579 580 (*auth_method)->auth = check_samstrict_security; 581 (*auth_method)->name = "sam"; 582 return NT_STATUS_OK; 583} 584 585NTSTATUS auth_sam_init(void) 586{ 587 smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam); 588 smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain); 589 return NT_STATUS_OK; 590} 591