libcli/auth/ntlm_check.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
   5    Copyright (C) Gerald Carter                             2003
   6    Copyright (C) Luke Kenneth Casson Leighton         1996-2000
   7
   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 3 of the License, or
  11    (at your option) any later version.
  12
  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.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "lib/crypto/md4.h"
  24 #include "librpc/gen_ndr/netlogon.h"
  25 #include "libcli/auth/libcli_auth.h"
  26
  27 /****************************************************************************
  28  Core of smb password checking routine.
  29 ****************************************************************************/
  30
  31 static bool smb_pwd_check_ntlmv1(TALLOC_CTX *mem_ctx,
  32                                  const DATA_BLOB *nt_response,
  33                                  const uint8_t *part_passwd,
  34                                  const DATA_BLOB *sec_blob,
  35                                  DATA_BLOB *user_sess_key)
  36 {
  37         /* Finish the encryption of part_passwd. */
  38         uint8_t p24[24];
  39         int rc;
  40         bool ok;
  41
  42         if (part_passwd == NULL) {
  43                 DEBUG(10,("No password set - DISALLOWING access\n"));
  44                 /* No password set - always false ! */
  45                 return false;
  46         }
  47
  48         if (sec_blob->length != 8) {
  49                 DBG_ERR("incorrect challenge size (%zu)\n", sec_blob->length);
  50                 return false;
  51         }
  52
  53         if (nt_response->length != 24) {
  54                 DBG_ERR("incorrect password length (%zu)\n",
  55                         nt_response->length);
  56                 return false;
  57         }
  58
  59         rc = SMBOWFencrypt(part_passwd, sec_blob->data, p24);
  60         if (rc != 0) {
  61                 return false;
  62         }
  63
  64 #if DEBUG_PASSWORD
  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);
  73 #endif
  74         ok = mem_equal_const_time(p24, nt_response->data, 24);
  75         if (!ok) {
  76                 return false;
  77         }
  78         if (user_sess_key != NULL) {
  79                 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
  80                 if (user_sess_key->data == NULL) {
  81                         DBG_ERR("data_blob_talloc failed\n");
  82                         return false;
  83                 }
  84                 SMBsesskeygen_ntv1(part_passwd, user_sess_key->data);
  85         }
  86         return true;
  87 }
  88
  89 /****************************************************************************
  90  Core of smb password checking routine. (NTLMv2, LMv2)
  91  Note:  The same code works with both NTLMv2 and LMv2.
  92 ****************************************************************************/
  93
  94 static bool smb_pwd_check_ntlmv2(TALLOC_CTX *mem_ctx,
  95                                  const DATA_BLOB *ntv2_response,
  96                                  const uint8_t *part_passwd,
  97                                  const DATA_BLOB *sec_blob,
  98                                  const char *user, const char *domain,
  99                                  DATA_BLOB *user_sess_key)
 100 {
 101         /* Finish the encryption of part_passwd. */
 102         uint8_t kr[16];
 103         uint8_t value_from_encryption[16];
 104         DATA_BLOB client_key_data;
 105         NTSTATUS status;
 106         bool ok;
 107
 108         if (part_passwd == NULL) {
 109                 DEBUG(10,("No password set - DISALLOWING access\n"));
 110                 /* No password set - always false */
 111                 return false;
 112         }
 113
 114         if (sec_blob->length != 8) {
 115                 DBG_ERR("incorrect challenge size (%zu)\n", sec_blob->length);
 116                 return false;
 117         }
 118
 119         if (ntv2_response->length < 24) {
 120                 /* We MUST have more than 16 bytes, or the stuff below will go
 121                    crazy.  No known implementation sends less than the 24 bytes
 122                    for LMv2, let alone NTLMv2. */
 123                 DBG_ERR("incorrect password length (%zu)\n",
 124                         ntv2_response->length);
 125                 return false;
 126         }
 127
 128         client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
 129         /*
 130            todo:  should we be checking this for anything?  We can't for LMv2,
 131            but for NTLMv2 it is meant to contain the current time etc.
 132         */
 133
 134         if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
 135                 return false;
 136         }
 137
 138         status = SMBOWFencrypt_ntv2(kr,
 139                                     sec_blob,
 140                                     &client_key_data,
 141                                     value_from_encryption);
 142         if (!NT_STATUS_IS_OK(status)) {
 143                 return false;
 144         }
 145
 146 #if DEBUG_PASSWORD
 147         DEBUG(100,("Part password (P16) was |\n"));
 148         dump_data(100, part_passwd, 16);
 149         DEBUGADD(100,("Password from client was |\n"));
 150         dump_data(100, ntv2_response->data, ntv2_response->length);
 151         DEBUGADD(100,("Variable data from client was |\n"));
 152         dump_data(100, client_key_data.data, client_key_data.length);
 153         DEBUGADD(100,("Given challenge was |\n"));
 154         dump_data(100, sec_blob->data, sec_blob->length);
 155         DEBUGADD(100,("Value from encryption was |\n"));
 156         dump_data(100, value_from_encryption, 16);
 157 #endif
 158         data_blob_clear_free(&client_key_data);
 159
 160         ok = mem_equal_const_time(value_from_encryption, ntv2_response->data, 16);
 161         if (!ok) {
 162                 return false;
 163         }
 164         if (user_sess_key != NULL) {
 165                 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
 166                 if (user_sess_key->data == NULL) {
 167                         DBG_ERR("data_blob_talloc failed\n");
 168                         return false;
 169                 }
 170
 171                 status = SMBsesskeygen_ntv2(
 172                         kr, value_from_encryption, user_sess_key->data);
 173                 if (!NT_STATUS_IS_OK(status)) {
 174                         return false;
 175                 }
 176         }
 177         return true;
 178 }
 179
 180 /****************************************************************************
 181  Core of smb password checking routine. (NTLMv2, LMv2)
 182  Note:  The same code works with both NTLMv2 and LMv2.
 183 ****************************************************************************/
 184
 185 static bool smb_sess_key_ntlmv2(TALLOC_CTX *mem_ctx,
 186                                 const DATA_BLOB *ntv2_response,
 187                                 const uint8_t *part_passwd,
 188                                 const DATA_BLOB *sec_blob,
 189                                 const char *user, const char *domain,
 190                                 DATA_BLOB *user_sess_key)
 191 {
 192         /* Finish the encryption of part_passwd. */
 193         uint8_t kr[16];
 194         uint8_t value_from_encryption[16];
 195         DATA_BLOB client_key_data;
 196         NTSTATUS status;
 197
 198         if (part_passwd == NULL) {
 199                 DEBUG(10,("No password set - DISALLOWING access\n"));
 200                 /* No password set - always false */
 201                 return false;
 202         }
 203
 204         if (sec_blob->length != 8) {
 205                 DBG_ERR("incorrect challenge size (%zu)\n", sec_blob->length);
 206                 return false;
 207         }
 208
 209         if (ntv2_response->length < 24) {
 210                 /* We MUST have more than 16 bytes, or the stuff below will go
 211                    crazy.  No known implementation sends less than the 24 bytes
 212                    for LMv2, let alone NTLMv2. */
 213                 DBG_ERR("incorrect password length (%zu)\n",
 214                         ntv2_response->length);
 215                 return false;
 216         }
 217
 218         client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
 219
 220         if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
 221                 return false;
 222         }
 223
 224         status = SMBOWFencrypt_ntv2(kr,
 225                                     sec_blob,
 226                                     &client_key_data,
 227                                     value_from_encryption);
 228         if (!NT_STATUS_IS_OK(status)) {
 229                 return false;
 230         }
 231         *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
 232         if (user_sess_key->data == NULL) {
 233                 DBG_ERR("data_blob_talloc failed\n");
 234                 return false;
 235         }
 236         status = SMBsesskeygen_ntv2(kr,
 237                                     value_from_encryption,
 238                                     user_sess_key->data);
 239         if (!NT_STATUS_IS_OK(status)) {
 240                 return false;
 241         }
 242         return true;
 243 }
 244
 245 /**
 246  * Compare password hashes against those from the SAM
 247  *
 248  * @param mem_ctx talloc context
 249  * @param client_lanman LANMAN password hash, as supplied by the client
 250  * @param client_nt NT (MD4) password hash, as supplied by the client
 251  * @param username internal Samba username, for log messages
 252  * @param client_username username the client used
 253  * @param client_domain domain name the client used (may be mapped)
 254  * @param stored_lanman LANMAN password hash, as stored on the SAM
 255  * @param stored_nt NT (MD4) password hash, as stored on the SAM
 256  * @param user_sess_key User session key
 257  * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 258  */
 259
 260 NTSTATUS hash_password_check(TALLOC_CTX *mem_ctx,
 261                              bool lanman_auth,
 262                              enum ntlm_auth_level ntlm_auth,
 263                              const struct samr_Password *client_lanman,
 264                              const struct samr_Password *client_nt,
 265                              const char *username,
 266                              const struct samr_Password *stored_lanman,
 267                              const struct samr_Password *stored_nt)
 268 {
 269         if (ntlm_auth == NTLM_AUTH_DISABLED) {
 270                 DBG_WARNING("hash_password_check: NTLM authentication not "
 271                             "permitted by configuration.\n");
 272                 return NT_STATUS_NTLM_BLOCKED;
 273         }
 274
 275         if (stored_nt == NULL) {
 276                 DEBUG(3,("hash_password_check: NO NT password stored for user %s.\n",
 277                          username));
 278         }
 279
 280         if (client_nt && stored_nt) {
 281                 if (mem_equal_const_time(client_nt->hash, stored_nt->hash, sizeof(stored_nt->hash))) {
 282                         return NT_STATUS_OK;
 283                 } else {
 284                         DEBUG(3,("hash_password_check: Interactive logon: NT password check failed for user %s\n",
 285                                  username));
 286                         return NT_STATUS_WRONG_PASSWORD;
 287                 }
 288
 289         } else if (client_lanman && stored_lanman) {
 290                 if (!lanman_auth) {
 291                         DEBUG(3,("hash_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
 292                                  username));
 293                         return NT_STATUS_WRONG_PASSWORD;
 294                 }
 295                 if (strchr_m(username, '@')) {
 296                         return NT_STATUS_NOT_FOUND;
 297                 }
 298
 299                 if (mem_equal_const_time(client_lanman->hash, stored_lanman->hash, sizeof(stored_lanman->hash))) {
 300                         return NT_STATUS_OK;
 301                 } else {
 302                         DEBUG(3,("hash_password_check: Interactive logon: LANMAN password check failed for user %s\n",
 303                                  username));
 304                         return NT_STATUS_WRONG_PASSWORD;
 305                 }
 306         }
 307         if (strchr_m(username, '@')) {
 308                 return NT_STATUS_NOT_FOUND;
 309         }
 310         return NT_STATUS_WRONG_PASSWORD;
 311 }
 312
 313 /**
 314  * Check a challenge-response password against the value of the NT or
 315  * LM password hash.
 316  *
 317  * @param mem_ctx talloc context
 318  * @param challenge 8-byte challenge.  If all zero, forces plaintext comparison
 319  * @param nt_response 'unicode' NT response to the challenge, or unicode password
 320  * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
 321  * @param username internal Samba username, for log messages
 322  * @param client_username username the client used
 323  * @param client_domain domain name the client used (may be mapped)
 324  * @param stored_lanman LANMAN ASCII password from our passdb or similar
 325  * @param stored_nt MD4 unicode password from our passdb or similar
 326  * @param user_sess_key User session key
 327  * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 328  */
 329
 330 NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
 331                              bool lanman_auth,
 332                              enum ntlm_auth_level ntlm_auth,
 333                              uint32_t logon_parameters,
 334                              const DATA_BLOB *challenge,
 335                              const DATA_BLOB *lm_response,
 336                              const DATA_BLOB *nt_response,
 337                              const char *username,
 338                              const char *client_username,
 339                              const char *client_domain,
 340                              const struct samr_Password *stored_lanman,
 341                              const struct samr_Password *stored_nt,
 342                              DATA_BLOB *user_sess_key,
 343                              DATA_BLOB *lm_sess_key)
 344 {
 345         DATA_BLOB tmp_sess_key;
 346         const char *upper_client_domain = NULL;
 347
 348         if (ntlm_auth == NTLM_AUTH_DISABLED) {
 349                 DBG_WARNING("ntlm_password_check: NTLM authentication not "
 350                             "permitted by configuration.\n");
 351                 return NT_STATUS_NTLM_BLOCKED;
 352         }
 353
 354         if (client_domain != NULL) {
 355                 upper_client_domain = talloc_strdup_upper(mem_ctx, client_domain);
 356                 if (upper_client_domain == NULL) {
 357                         return NT_STATUS_NO_MEMORY;
 358                 }
 359         }
 360
 361         if (stored_nt == NULL) {
 362                 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
 363                          username));
 364         }
 365
 366         *lm_sess_key = data_blob(NULL, 0);
 367         *user_sess_key = data_blob(NULL, 0);
 368
 369         /* Check for cleartext netlogon. Used by Exchange 5.5. */
 370         if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
 371             && challenge->length == 8
 372             && (all_zero(challenge->data, challenge->length))) {
 373                 struct samr_Password client_nt;
 374                 struct samr_Password client_lm;
 375                 char *unix_pw = NULL;
 376                 bool lm_ok;
 377                 size_t converted_size = 0;
 378
 379                 DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
 380                          username));
 381                 mdfour(client_nt.hash, nt_response->data, nt_response->length);
 382
 383                 if (lm_response->length &&
 384                     (convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX,
 385                                           lm_response->data, lm_response->length,
 386                                            &unix_pw, &converted_size))) {
 387                         if (E_deshash(unix_pw, client_lm.hash)) {
 388                                 lm_ok = true;
 389                         } else {
 390                                 lm_ok = false;
 391                         }
 392                 } else {
 393                         lm_ok = false;
 394                 }
 395                 return hash_password_check(mem_ctx,
 396                                            lanman_auth,
 397                                            ntlm_auth,
 398                                            lm_ok ? &client_lm : NULL,
 399                                            nt_response->length ? &client_nt : NULL,
 400                                            username,
 401                                            stored_lanman, stored_nt);
 402         }
 403
 404         if (nt_response->length != 0 && nt_response->length < 24) {
 405                 DBG_NOTICE("invalid NT password length (%zu) for user %s\n",
 406                            nt_response->length,
 407                            username);
 408         }
 409
 410         if (nt_response->length > 24 && stored_nt) {
 411                 /* We have the NT MD4 hash challenge available - see if we can
 412                    use it
 413                 */
 414                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n",
 415                         client_domain ? client_domain : "<NULL>"));
 416                 if (smb_pwd_check_ntlmv2(mem_ctx,
 417                                          nt_response,
 418                                          stored_nt->hash, challenge,
 419                                          client_username,
 420                                          client_domain,
 421                                          user_sess_key)) {
 422                         if (user_sess_key->length) {
 423                                 *lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
 424                         }
 425                         return NT_STATUS_OK;
 426                 }
 427
 428                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n",
 429                         upper_client_domain ? upper_client_domain : "<NULL>"));
 430                 if (smb_pwd_check_ntlmv2(mem_ctx,
 431                                          nt_response,
 432                                          stored_nt->hash, challenge,
 433                                          client_username,
 434                                          upper_client_domain,
 435                                          user_sess_key)) {
 436                         if (user_sess_key->length) {
 437                                 *lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
 438                         }
 439                         return NT_STATUS_OK;
 440                 }
 441
 442                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
 443                 if (smb_pwd_check_ntlmv2(mem_ctx,
 444                                          nt_response,
 445                                          stored_nt->hash, challenge,
 446                                          client_username,
 447                                          "",
 448                                          user_sess_key)) {
 449                         if (user_sess_key->length) {
 450                                 *lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
 451                         }
 452                         return NT_STATUS_OK;
 453                 } else {
 454                         DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
 455                 }
 456         } else if (nt_response->length == 24 && stored_nt) {
 457                 if (ntlm_auth == NTLM_AUTH_ON
 458                     || (ntlm_auth == NTLM_AUTH_MSCHAPv2_NTLMV2_ONLY && (logon_parameters & MSV1_0_ALLOW_MSVCHAPV2))) {
 459                         /* We have the NT MD4 hash challenge available - see if we can
 460                            use it (ie. does it exist in the smbpasswd file).
 461                         */
 462                         DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
 463                         if (smb_pwd_check_ntlmv1(mem_ctx,
 464                                                  nt_response,
 465                                                  stored_nt->hash, challenge,
 466                                                  user_sess_key)) {
 467                                 /* The LM session key for this response is not very secure,
 468                                    so use it only if we otherwise allow LM authentication */
 469
 470                                 if (lanman_auth && stored_lanman) {
 471                                         *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, MIN(8, user_sess_key->length));
 472                                 }
 473                                 return NT_STATUS_OK;
 474                         } else {
 475                                 DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
 476                                          username));
 477                                 return NT_STATUS_WRONG_PASSWORD;
 478                         }
 479                 } else {
 480                         DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
 481                                  username));
 482                         /* no return, because we might pick up LMv2 in the LM field */
 483                 }
 484         }
 485
 486         if (lm_response->length == 0) {
 487                 DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
 488                          username));
 489                 return NT_STATUS_WRONG_PASSWORD;
 490         }
 491
 492         if (lm_response->length < 24) {
 493                 DBG_NOTICE("invalid LanMan password length (%zu) for "
 494                            "user %s\n",
 495                            nt_response->length, username);
 496                 return NT_STATUS_WRONG_PASSWORD;
 497         }
 498
 499         if (!lanman_auth) {
 500                 DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
 501                          username));
 502         } else if (!stored_lanman) {
 503                 DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
 504                          username));
 505         } else if (strchr_m(username, '@')) {
 506                 DEBUG(3,("ntlm_password_check: NO LanMan password allowed for username@realm logins (user: %s)\n",
 507                          username));
 508         } else {
 509                 DEBUG(4,("ntlm_password_check: Checking LM password\n"));
 510                 if (smb_pwd_check_ntlmv1(mem_ctx,
 511                                          lm_response,
 512                                          stored_lanman->hash, challenge,
 513                                          NULL)) {
 514                         /* The session key for this response is still very odd.
 515                            It not very secure, so use it only if we otherwise
 516                            allow LM authentication */
 517
 518                         if (lanman_auth && stored_lanman) {
 519                                 uint8_t first_8_lm_hash[16];
 520                                 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
 521                                 memset(first_8_lm_hash + 8, '\0', 8);
 522                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 523                                 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 524                         }
 525                         return NT_STATUS_OK;
 526                 }
 527         }
 528
 529         if (!stored_nt) {
 530                 DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
 531                 return NT_STATUS_WRONG_PASSWORD;
 532         }
 533
 534         /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 535            - related to Win9X, legacy NAS pass-though authentication
 536         */
 537         DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n",
 538                 client_domain ? client_domain : "<NULL>"));
 539         if (smb_pwd_check_ntlmv2(mem_ctx,
 540                                  lm_response,
 541                                  stored_nt->hash, challenge,
 542                                  client_username,
 543                                  client_domain,
 544                                  &tmp_sess_key)) {
 545                 if (nt_response->length > 24) {
 546                         /* If NTLMv2 authentication has preceded us
 547                          * (even if it failed), then use the session
 548                          * key from that.  See the RPC-SAMLOGON
 549                          * torture test */
 550                         smb_sess_key_ntlmv2(mem_ctx,
 551                                             nt_response,
 552                                             stored_nt->hash, challenge,
 553                                             client_username,
 554                                             client_domain,
 555                                             user_sess_key);
 556                 } else {
 557                         /* Otherwise, use the LMv2 session key */
 558                         *user_sess_key = tmp_sess_key;
 559                 }
 560                 if (user_sess_key->length) {
 561                         *lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
 562                 }
 563                 return NT_STATUS_OK;
 564         }
 565
 566         DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n",
 567                 upper_client_domain ? upper_client_domain : "<NULL>"));
 568         if (smb_pwd_check_ntlmv2(mem_ctx,
 569                                  lm_response,
 570                                  stored_nt->hash, challenge,
 571                                  client_username,
 572                                  upper_client_domain,
 573                                  &tmp_sess_key)) {
 574                 if (nt_response->length > 24) {
 575                         /* If NTLMv2 authentication has preceded us
 576                          * (even if it failed), then use the session
 577                          * key from that.  See the RPC-SAMLOGON
 578                          * torture test */
 579                         smb_sess_key_ntlmv2(mem_ctx,
 580                                             nt_response,
 581                                             stored_nt->hash, challenge,
 582                                             client_username,
 583                                             upper_client_domain,
 584                                             user_sess_key);
 585                 } else {
 586                         /* Otherwise, use the LMv2 session key */
 587                         *user_sess_key = tmp_sess_key;
 588                 }
 589                 if (user_sess_key->length) {
 590                         *lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
 591                 }
 592                 return NT_STATUS_OK;
 593         }
 594
 595         DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
 596         if (smb_pwd_check_ntlmv2(mem_ctx,
 597                                  lm_response,
 598                                  stored_nt->hash, challenge,
 599                                  client_username,
 600                                  "",
 601                                  &tmp_sess_key)) {
 602                 if (nt_response->length > 24) {
 603                         /* If NTLMv2 authentication has preceded us
 604                          * (even if it failed), then use the session
 605                          * key from that.  See the RPC-SAMLOGON
 606                          * torture test */
 607                         smb_sess_key_ntlmv2(mem_ctx,
 608                                             nt_response,
 609                                             stored_nt->hash, challenge,
 610                                             client_username,
 611                                             "",
 612                                             user_sess_key);
 613                 } else {
 614                         /* Otherwise, use the LMv2 session key */
 615                         *user_sess_key = tmp_sess_key;
 616                 }
 617                 if (user_sess_key->length) {
 618                         *lm_sess_key = data_blob_talloc(mem_ctx, user_sess_key->data, MIN(8, user_sess_key->length));
 619                 }
 620                 return NT_STATUS_OK;
 621         }
 622
 623         /* Apparently NT accepts NT responses in the LM field
 624            - I think this is related to Win9X pass-though authentication
 625         */
 626         DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
 627         if (ntlm_auth == NTLM_AUTH_ON) {
 628                 if (smb_pwd_check_ntlmv1(mem_ctx,
 629                                          lm_response,
 630                                          stored_nt->hash, challenge,
 631                                          NULL)) {
 632                         /* The session key for this response is still very odd.
 633                            It not very secure, so use it only if we otherwise
 634                            allow LM authentication */
 635
 636                         if (lanman_auth && stored_lanman) {
 637                                 uint8_t first_8_lm_hash[16];
 638                                 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
 639                                 memset(first_8_lm_hash + 8, '\0', 8);
 640                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 641                                 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 642                         }
 643                         return NT_STATUS_OK;
 644                 }
 645                 DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
 646         } else {
 647                 DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
 648         }
 649
 650         /* Try and match error codes */
 651         if (strchr_m(username, '@')) {
 652                 return NT_STATUS_NOT_FOUND;
 653         }
 654         return NT_STATUS_WRONG_PASSWORD;
 655 }
 656