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