source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/crypto/crypto.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_AUTH
  28
  29 /****************************************************************************
  30  Core of smb password checking routine.
  31 ****************************************************************************/
  32
  33 static BOOL smb_pwd_check_ntlmv1(TALLOC_CTX *mem_ctx,
  34                                  const DATA_BLOB *nt_response,
  35                                  const uint8_t *part_passwd,
  36                                  const DATA_BLOB *sec_blob,
  37                                  DATA_BLOB *user_sess_key)
  38 {
  39         /* Finish the encryption of part_passwd. */
  40         uint8_t p24[24];
  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                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n",
  50                           (unsigned long)sec_blob->length));
  51                 return False;
  52         }
  53
  54         if (nt_response->length != 24) {
  55                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n",
  56                           (unsigned long)nt_response->length));
  57                 return False;
  58         }
  59
  60         SMBOWFencrypt(part_passwd, sec_blob->data, p24);
  61
  62 #if DEBUG_PASSWORD
  63         DEBUG(100,("Part password (P16) was |\n"));
  64         dump_data(100, part_passwd, 16);
  65         DEBUGADD(100,("Password from client was |\n"));
  66         dump_data(100, nt_response->data, nt_response->length);
  67         DEBUGADD(100,("Given challenge was |\n"));
  68         dump_data(100, sec_blob->data, sec_blob->length);
  69         DEBUGADD(100,("Value from encryption was |\n"));
  70         dump_data(100, p24, 24);
  71 #endif
  72         if (memcmp(p24, nt_response->data, 24) == 0) {
  73                 if (user_sess_key != NULL) {
  74                         *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
  75                         SMBsesskeygen_ntv1(part_passwd, user_sess_key->data);
  76                 }
  77                 return True;
  78         }
  79         return False;
  80 }
  81
  82 /****************************************************************************
  83  Core of smb password checking routine. (NTLMv2, LMv2)
  84  Note:  The same code works with both NTLMv2 and LMv2.
  85 ****************************************************************************/
  86
  87 static BOOL smb_pwd_check_ntlmv2(TALLOC_CTX *mem_ctx,
  88                                  const DATA_BLOB *ntv2_response,
  89                                  const uint8_t *part_passwd,
  90                                  const DATA_BLOB *sec_blob,
  91                                  const char *user, const char *domain,
  92                                  BOOL upper_case_domain, /* should the domain be transformed into upper case? */
  93                                  DATA_BLOB *user_sess_key)
  94 {
  95         /* Finish the encryption of part_passwd. */
  96         uint8_t kr[16];
  97         uint8_t value_from_encryption[16];
  98         DATA_BLOB client_key_data;
  99
 100         if (part_passwd == NULL) {
 101                 DEBUG(10,("No password set - DISALLOWING access\n"));
 102                 /* No password set - always False */
 103                 return False;
 104         }
 105
 106         if (sec_blob->length != 8) {
 107                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n",
 108                           (unsigned long)sec_blob->length));
 109                 return False;
 110         }
 111
 112         if (ntv2_response->length < 24) {
 113                 /* We MUST have more than 16 bytes, or the stuff below will go
 114                    crazy.  No known implementation sends less than the 24 bytes
 115                    for LMv2, let alone NTLMv2. */
 116                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
 117                           (unsigned long)ntv2_response->length));
 118                 return False;
 119         }
 120
 121         client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
 122         /*
 123            todo:  should we be checking this for anything?  We can't for LMv2,
 124            but for NTLMv2 it is meant to contain the current time etc.
 125         */
 126
 127         if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
 128                 return False;
 129         }
 130
 131         SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
 132
 133 #if DEBUG_PASSWORD
 134         DEBUG(100,("Part password (P16) was |\n"));
 135         dump_data(100, part_passwd, 16);
 136         DEBUGADD(100,("Password from client was |\n"));
 137         dump_data(100, ntv2_response->data, ntv2_response->length);
 138         DEBUGADD(100,("Variable data from client was |\n"));
 139         dump_data(100, client_key_data.data, client_key_data.length);
 140         DEBUGADD(100,("Given challenge was |\n"));
 141         dump_data(100, sec_blob->data, sec_blob->length);
 142         DEBUGADD(100,("Value from encryption was |\n"));
 143         dump_data(100, value_from_encryption, 16);
 144 #endif
 145         data_blob_clear_free(&client_key_data);
 146         if (memcmp(value_from_encryption, ntv2_response->data, 16) == 0) {
 147                 if (user_sess_key != NULL) {
 148                         *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
 149                         SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
 150                 }
 151                 return True;
 152         }
 153         return False;
 154 }
 155
 156 /****************************************************************************
 157  Core of smb password checking routine. (NTLMv2, LMv2)
 158  Note:  The same code works with both NTLMv2 and LMv2.
 159 ****************************************************************************/
 160
 161 static BOOL smb_sess_key_ntlmv2(TALLOC_CTX *mem_ctx,
 162                                 const DATA_BLOB *ntv2_response,
 163                                 const uint8_t *part_passwd,
 164                                 const DATA_BLOB *sec_blob,
 165                                 const char *user, const char *domain,
 166                                 BOOL upper_case_domain, /* should the domain be transformed into upper case? */
 167                                 DATA_BLOB *user_sess_key)
 168 {
 169         /* Finish the encryption of part_passwd. */
 170         uint8_t kr[16];
 171         uint8_t value_from_encryption[16];
 172         DATA_BLOB client_key_data;
 173
 174         if (part_passwd == NULL) {
 175                 DEBUG(10,("No password set - DISALLOWING access\n"));
 176                 /* No password set - always False */
 177                 return False;
 178         }
 179
 180         if (sec_blob->length != 8) {
 181                 DEBUG(0, ("smb_sess_key_ntlmv2: incorrect challenge size (%lu)\n",
 182                           (unsigned long)sec_blob->length));
 183                 return False;
 184         }
 185
 186         if (ntv2_response->length < 24) {
 187                 /* We MUST have more than 16 bytes, or the stuff below will go
 188                    crazy.  No known implementation sends less than the 24 bytes
 189                    for LMv2, let alone NTLMv2. */
 190                 DEBUG(0, ("smb_sess_key_ntlmv2: incorrect password length (%lu)\n",
 191                           (unsigned long)ntv2_response->length));
 192                 return False;
 193         }
 194
 195         client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
 196
 197         if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
 198                 return False;
 199         }
 200
 201         SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
 202         *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
 203         SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
 204         return True;
 205 }
 206
 207 /**
 208  * Check a challenge-response password against the value of the NT or
 209  * LM password hash.
 210  *
 211  * @param mem_ctx talloc context
 212  * @param challenge 8-byte challenge.  If all zero, forces plaintext comparison
 213  * @param nt_response 'unicode' NT response to the challenge, or unicode password
 214  * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
 215  * @param username internal Samba username, for log messages
 216  * @param client_username username the client used
 217  * @param client_domain domain name the client used (may be mapped)
 218  * @param nt_pw MD4 unicode password from our passdb or similar
 219  * @param lm_pw LANMAN ASCII password from our passdb or similar
 220  * @param user_sess_key User session key
 221  * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 222  */
 223
 224 NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
 225                              const DATA_BLOB *challenge,
 226                              const DATA_BLOB *lm_response,
 227                              const DATA_BLOB *nt_response,
 228                              const DATA_BLOB *lm_interactive_password,
 229                              const DATA_BLOB *nt_interactive_password,
 230                              const char *username,
 231                              const char *client_username,
 232                              const char *client_domain,
 233                              const uint8_t *lm_pw, const uint8_t *nt_pw,
 234                              DATA_BLOB *user_sess_key,
 235                              DATA_BLOB *lm_sess_key)
 236 {
 237         static const uint8_t zeros[8];
 238         DATA_BLOB tmp_sess_key;
 239
 240         if (nt_pw == NULL) {
 241                 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
 242                          username));
 243         }
 244
 245         if (lm_sess_key) {
 246                 *lm_sess_key = data_blob(NULL, 0);
 247         }
 248         if (user_sess_key) {
 249                 *user_sess_key = data_blob(NULL, 0);
 250         }
 251
 252         if (nt_interactive_password && nt_interactive_password->length && nt_pw) {
 253                 if (nt_interactive_password->length != 16) {
 254                         DEBUG(3,("ntlm_password_check: Interactive logon: Invalid NT password length (%d) supplied for user %s\n", (int)nt_interactive_password->length,
 255                                  username));
 256                         return NT_STATUS_WRONG_PASSWORD;
 257                 }
 258
 259                 if (memcmp(nt_interactive_password->data, nt_pw, 16) == 0) {
 260                         if (user_sess_key) {
 261                                 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
 262                                 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
 263                         }
 264                         return NT_STATUS_OK;
 265                 } else {
 266                         DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
 267                                  username));
 268                         return NT_STATUS_WRONG_PASSWORD;
 269                 }
 270
 271         } else if (lm_interactive_password && lm_interactive_password->length && lm_pw) {
 272                 if (lm_interactive_password->length != 16) {
 273                         DEBUG(3,("ntlm_password_check: Interactive logon: Invalid LANMAN password length (%d) supplied for user %s\n", (int)lm_interactive_password->length,
 274                                  username));
 275                         return NT_STATUS_WRONG_PASSWORD;
 276                 }
 277
 278                 if (!lp_lanman_auth()) {
 279                         DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
 280                                  username));
 281                         return NT_STATUS_WRONG_PASSWORD;
 282                 }
 283
 284                 if (memcmp(lm_interactive_password->data, lm_pw, 16) == 0) {
 285                         return NT_STATUS_OK;
 286                 } else {
 287                         DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
 288                                  username));
 289                         return NT_STATUS_WRONG_PASSWORD;
 290                 }
 291         }
 292
 293         /* Check for cleartext netlogon. Used by Exchange 5.5. */
 294         if (challenge->length == sizeof(zeros) &&
 295             (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
 296
 297                 DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
 298                          username));
 299                 if (nt_pw && nt_response->length) {
 300                         uint8_t pwhash[16];
 301                         mdfour(pwhash, nt_response->data, nt_response->length);
 302                         if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
 303                                 return NT_STATUS_OK;
 304                         } else {
 305                                 DEBUG(3,("ntlm_password_check: NT (Unicode) plaintext password check failed for user %s\n",
 306                                          username));
 307                                 return NT_STATUS_WRONG_PASSWORD;
 308                         }
 309
 310                 } else if (!lp_lanman_auth()) {
 311                         DEBUG(3,("ntlm_password_check: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
 312                                  username));
 313
 314                 } else if (lm_pw && lm_response->length) {
 315                         uint8_t dospwd[14];
 316                         uint8_t p16[16];
 317                         ZERO_STRUCT(dospwd);
 318
 319                         memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
 320                         /* Only the fisrt 14 chars are considered, password need not be null terminated. */
 321
 322                         /* we *might* need to upper-case the string here */
 323                         E_P16((const uint8_t *)dospwd, p16);
 324
 325                         if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
 326                                 return NT_STATUS_OK;
 327                         } else {
 328                                 DEBUG(3,("ntlm_password_check: LANMAN (ASCII) plaintext password check failed for user %s\n",
 329                                          username));
 330                                 return NT_STATUS_WRONG_PASSWORD;
 331                         }
 332                 } else {
 333                         DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
 334                         return NT_STATUS_WRONG_PASSWORD;
 335                 }
 336         }
 337
 338         if (nt_response->length != 0 && nt_response->length < 24) {
 339                 DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
 340                          (unsigned long)nt_response->length, username));
 341         }
 342
 343         if (nt_response->length > 24 && nt_pw) {
 344                 /* We have the NT MD4 hash challenge available - see if we can
 345                    use it
 346                 */
 347                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
 348                 if (smb_pwd_check_ntlmv2(mem_ctx,
 349                                          nt_response,
 350                                          nt_pw, challenge,
 351                                          client_username,
 352                                          client_domain,
 353                                          False,
 354                                          user_sess_key)) {
 355                         if (lm_sess_key) {
 356                                 *lm_sess_key = *user_sess_key;
 357                                 if (user_sess_key->length) {
 358                                         lm_sess_key->length = 8;
 359                                 }
 360                         }
 361                         return NT_STATUS_OK;
 362                 }
 363
 364                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
 365                 if (smb_pwd_check_ntlmv2(mem_ctx,
 366                                          nt_response,
 367                                          nt_pw, challenge,
 368                                          client_username,
 369                                          client_domain,
 370                                          True,
 371                                          user_sess_key)) {
 372                         if (lm_sess_key) {
 373                                 *lm_sess_key = *user_sess_key;
 374                                 if (user_sess_key->length) {
 375                                         lm_sess_key->length = 8;
 376                                 }
 377                         }
 378                         return NT_STATUS_OK;
 379                 }
 380
 381                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
 382                 if (smb_pwd_check_ntlmv2(mem_ctx,
 383                                          nt_response,
 384                                          nt_pw, challenge,
 385                                          client_username,
 386                                          "",
 387                                          False,
 388                                          user_sess_key)) {
 389                         if (lm_sess_key) {
 390                                 *lm_sess_key = *user_sess_key;
 391                                 if (user_sess_key->length) {
 392                                         lm_sess_key->length = 8;
 393                                 }
 394                         }
 395                         return NT_STATUS_OK;
 396                 } else {
 397                         DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
 398                 }
 399         } else if (nt_response->length == 24 && nt_pw) {
 400                 if (lp_ntlm_auth()) {
 401                         /* We have the NT MD4 hash challenge available - see if we can
 402                            use it (ie. does it exist in the smbpasswd file).
 403                         */
 404                         DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
 405                         if (smb_pwd_check_ntlmv1(mem_ctx,
 406                                                  nt_response,
 407                                                  nt_pw, challenge,
 408                                                  user_sess_key)) {
 409                                 /* The LM session key for this response is not very secure,
 410                                    so use it only if we otherwise allow LM authentication */
 411
 412                                 if (lp_lanman_auth() && lm_pw) {
 413                                         *lm_sess_key = data_blob_talloc(mem_ctx, lm_pw, 8);
 414                                 }
 415                                 return NT_STATUS_OK;
 416                         } else {
 417                                 DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
 418                                          username));
 419                                 return NT_STATUS_WRONG_PASSWORD;
 420                         }
 421                 } else {
 422                         DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
 423                                  username));
 424                         /* no return, becouse we might pick up LMv2 in the LM field */
 425                 }
 426         }
 427
 428         if (lm_response->length == 0) {
 429                 DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
 430                          username));
 431                 return NT_STATUS_WRONG_PASSWORD;
 432         }
 433
 434         if (lm_response->length < 24) {
 435                 DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
 436                          (unsigned long)nt_response->length, username));
 437                 return NT_STATUS_WRONG_PASSWORD;
 438         }
 439
 440         if (!lp_lanman_auth()) {
 441                 DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
 442                          username));
 443         } else if (!lm_pw) {
 444                 DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
 445                          username));
 446         } else {
 447                 DEBUG(4,("ntlm_password_check: Checking LM password\n"));
 448                 if (smb_pwd_check_ntlmv1(mem_ctx,
 449                                          lm_response,
 450                                          lm_pw, challenge,
 451                                          NULL)) {
 452                         /* The session key for this response is still very odd.
 453                            It not very secure, so use it only if we otherwise
 454                            allow LM authentication */
 455
 456                         if (lp_lanman_auth() && lm_pw) {
 457                                 uint8_t first_8_lm_hash[16];
 458                                 memcpy(first_8_lm_hash, lm_pw, 8);
 459                                 memset(first_8_lm_hash + 8, '\0', 8);
 460                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 461                                 *lm_sess_key = data_blob_talloc(mem_ctx, lm_pw, 8);
 462                         }
 463                         return NT_STATUS_OK;
 464                 }
 465         }
 466
 467         if (!nt_pw) {
 468                 DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
 469                 return NT_STATUS_WRONG_PASSWORD;
 470         }
 471
 472         /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 473            - related to Win9X, legacy NAS pass-though authentication
 474         */
 475         DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
 476         if (smb_pwd_check_ntlmv2(mem_ctx,
 477                                  lm_response,
 478                                  nt_pw, challenge,
 479                                  client_username,
 480                                  client_domain,
 481                                  False,
 482                                  &tmp_sess_key)) {
 483                 if (nt_response->length > 24) {
 484                         /* If NTLMv2 authentication has preceeded us
 485                          * (even if it failed), then use the session
 486                          * key from that.  See the RPC-SAMLOGON
 487                          * torture test */
 488                         smb_sess_key_ntlmv2(mem_ctx,
 489                                             nt_response,
 490                                             nt_pw, challenge,
 491                                             client_username,
 492                                             client_domain,
 493                                             False,
 494                                             user_sess_key);
 495                 } else if (user_sess_key) {
 496                         /* Otherwise, use the LMv2 session key */
 497                         *user_sess_key = tmp_sess_key;
 498                 }
 499                 if (user_sess_key && lm_sess_key) {
 500                         *lm_sess_key = *user_sess_key;
 501                         if (user_sess_key->length) {
 502                                 lm_sess_key->length = 8;
 503                         }
 504                 }
 505                 return NT_STATUS_OK;
 506         }
 507
 508         DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
 509         if (smb_pwd_check_ntlmv2(mem_ctx,
 510                                  lm_response,
 511                                  nt_pw, challenge,
 512                                  client_username,
 513                                  client_domain,
 514                                  True,
 515                                  &tmp_sess_key)) {
 516                 if (nt_response->length > 24) {
 517                         /* If NTLMv2 authentication has preceeded us
 518                          * (even if it failed), then use the session
 519                          * key from that.  See the RPC-SAMLOGON
 520                          * torture test */
 521                         smb_sess_key_ntlmv2(mem_ctx,
 522                                             nt_response,
 523                                             nt_pw, challenge,
 524                                             client_username,
 525                                             client_domain,
 526                                             True,
 527                                             user_sess_key);
 528                 } else if (user_sess_key) {
 529                         /* Otherwise, use the LMv2 session key */
 530                         *user_sess_key = tmp_sess_key;
 531                 }
 532                 if (user_sess_key && lm_sess_key) {
 533                         *lm_sess_key = *user_sess_key;
 534                         if (user_sess_key->length) {
 535                                 lm_sess_key->length = 8;
 536                         }
 537                 }
 538                 return NT_STATUS_OK;
 539         }
 540
 541         DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
 542         if (smb_pwd_check_ntlmv2(mem_ctx,
 543                                  lm_response,
 544                                  nt_pw, challenge,
 545                                  client_username,
 546                                  "",
 547                                  False,
 548                                  &tmp_sess_key)) {
 549                 if (nt_response->length > 24) {
 550                         /* If NTLMv2 authentication has preceeded us
 551                          * (even if it failed), then use the session
 552                          * key from that.  See the RPC-SAMLOGON
 553                          * torture test */
 554                         smb_sess_key_ntlmv2(mem_ctx,
 555                                             nt_response,
 556                                             nt_pw, challenge,
 557                                             client_username,
 558                                             "",
 559                                             False,
 560                                             user_sess_key);
 561                 } else if (user_sess_key) {
 562                         /* Otherwise, use the LMv2 session key */
 563                         *user_sess_key = tmp_sess_key;
 564                 }
 565                 if (user_sess_key && lm_sess_key) {
 566                         *lm_sess_key = *user_sess_key;
 567                         if (user_sess_key->length) {
 568                                 lm_sess_key->length = 8;
 569                         }
 570                 }
 571                 return NT_STATUS_OK;
 572         }
 573
 574         /* Apparently NT accepts NT responses in the LM field
 575            - I think this is related to Win9X pass-though authentication
 576         */
 577         DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
 578         if (lp_ntlm_auth()) {
 579                 if (smb_pwd_check_ntlmv1(mem_ctx,
 580                                          lm_response,
 581                                          nt_pw, challenge,
 582                                          NULL)) {
 583                         /* The session key for this response is still very odd.
 584                            It not very secure, so use it only if we otherwise
 585                            allow LM authentication */
 586
 587                         if (lp_lanman_auth() && lm_pw) {
 588                                 uint8_t first_8_lm_hash[16];
 589                                 memcpy(first_8_lm_hash, lm_pw, 8);
 590                                 memset(first_8_lm_hash + 8, '\0', 8);
 591                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 592                                 *lm_sess_key = data_blob_talloc(mem_ctx, lm_pw, 8);
 593                         }
 594                         return NT_STATUS_OK;
 595                 }
 596                 DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
 597         } else {
 598                 DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
 599         }
 600         return NT_STATUS_WRONG_PASSWORD;
 601 }
 602