source4/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 #include "librpc/gen_ndr/ndr_netlogon.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "libcli/auth/proto.h"
  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  * Compare password hashes against those from the SAM
 209  *
 210  * @param mem_ctx talloc context
 211  * @param client_lanman LANMAN password hash, as supplied by the client
 212  * @param client_nt NT (MD4) password hash, as supplied by the client
 213  * @param username internal Samba username, for log messages
 214  * @param client_username username the client used
 215  * @param client_domain domain name the client used (may be mapped)
 216  * @param stored_lanman LANMAN password hash, as stored on the SAM
 217  * @param stored_nt NT (MD4) password hash, as stored on the SAM
 218  * @param user_sess_key User session key
 219  * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 220  */
 221
 222 NTSTATUS hash_password_check(TALLOC_CTX *mem_ctx,
 223                              const struct samr_Password *client_lanman,
 224                              const struct samr_Password *client_nt,
 225                              const char *username,
 226                              const struct samr_Password *stored_lanman,
 227                              const struct samr_Password *stored_nt)
 228 {
 229         if (stored_nt == NULL) {
 230                 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
 231                          username));
 232         }
 233
 234         if (client_nt && stored_nt) {
 235                 if (memcmp(client_nt->hash, stored_nt->hash, sizeof(stored_nt->hash)) == 0) {
 236                         return NT_STATUS_OK;
 237                 } else {
 238                         DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
 239                                  username));
 240                         return NT_STATUS_WRONG_PASSWORD;
 241                 }
 242
 243         } else if (client_lanman && stored_lanman) {
 244                 if (!lp_lanman_auth()) {
 245                         DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
 246                                  username));
 247                         return NT_STATUS_WRONG_PASSWORD;
 248                 }
 249                 if (strchr_m(username, '@')) {
 250                         return NT_STATUS_NOT_FOUND;
 251                 }
 252
 253                 if (memcmp(client_lanman->hash, stored_lanman->hash, sizeof(stored_lanman->hash)) == 0) {
 254                         return NT_STATUS_OK;
 255                 } else {
 256                         DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
 257                                  username));
 258                         return NT_STATUS_WRONG_PASSWORD;
 259                 }
 260         }
 261         if (strchr_m(username, '@')) {
 262                 return NT_STATUS_NOT_FOUND;
 263         }
 264         return NT_STATUS_WRONG_PASSWORD;
 265 }
 266
 267 /**
 268  * Check a challenge-response password against the value of the NT or
 269  * LM password hash.
 270  *
 271  * @param mem_ctx talloc context
 272  * @param challenge 8-byte challenge.  If all zero, forces plaintext comparison
 273  * @param nt_response 'unicode' NT response to the challenge, or unicode password
 274  * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
 275  * @param username internal Samba username, for log messages
 276  * @param client_username username the client used
 277  * @param client_domain domain name the client used (may be mapped)
 278  * @param stored_lanman LANMAN ASCII password from our passdb or similar
 279  * @param stored_nt MD4 unicode password from our passdb or similar
 280  * @param user_sess_key User session key
 281  * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 282  */
 283
 284 NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
 285                              uint32_t logon_parameters,
 286                              const DATA_BLOB *challenge,
 287                              const DATA_BLOB *lm_response,
 288                              const DATA_BLOB *nt_response,
 289                              const char *username,
 290                              const char *client_username,
 291                              const char *client_domain,
 292                              const struct samr_Password *stored_lanman,
 293                              const struct samr_Password *stored_nt,
 294                              DATA_BLOB *user_sess_key,
 295                              DATA_BLOB *lm_sess_key)
 296 {
 297         static const uint8_t zeros[8];
 298         DATA_BLOB tmp_sess_key;
 299
 300         if (stored_nt == NULL) {
 301                 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
 302                          username));
 303         }
 304
 305         *lm_sess_key = data_blob(NULL, 0);
 306         *user_sess_key = data_blob(NULL, 0);
 307
 308         /* Check for cleartext netlogon. Used by Exchange 5.5. */
 309         if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
 310             && challenge->length == sizeof(zeros)
 311             && (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
 312                 struct samr_Password client_nt;
 313                 struct samr_Password client_lm;
 314                 char *unix_pw = NULL;
 315                 BOOL lm_ok;
 316
 317                 DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
 318                          username));
 319                 mdfour(client_nt.hash, nt_response->data, nt_response->length);
 320
 321                 if (lm_response->length &&
 322                     (convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX,
 323                                           lm_response->data, lm_response->length,
 324                                            (void **)&unix_pw) != -1)) {
 325                         if (E_deshash(unix_pw, client_lm.hash)) {
 326                                 lm_ok = True;
 327                         } else {
 328                                 lm_ok = False;
 329                         }
 330                 } else {
 331                         lm_ok = False;
 332                 }
 333                 return hash_password_check(mem_ctx,
 334                                            lm_ok ? &client_lm : NULL,
 335                                            nt_response->length ? &client_nt : NULL,
 336                                            username,
 337                                            stored_lanman, stored_nt);
 338         }
 339
 340         if (nt_response->length != 0 && nt_response->length < 24) {
 341                 DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
 342                          (unsigned long)nt_response->length, username));
 343         }
 344
 345         if (nt_response->length > 24 && stored_nt) {
 346                 /* We have the NT MD4 hash challenge available - see if we can
 347                    use it
 348                 */
 349                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
 350                 if (smb_pwd_check_ntlmv2(mem_ctx,
 351                                          nt_response,
 352                                          stored_nt->hash, challenge,
 353                                          client_username,
 354                                          client_domain,
 355                                          False,
 356                                          user_sess_key)) {
 357                         *lm_sess_key = *user_sess_key;
 358                         if (user_sess_key->length) {
 359                                 lm_sess_key->length = 8;
 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                                          stored_nt->hash, challenge,
 368                                          client_username,
 369                                          client_domain,
 370                                          True,
 371                                          user_sess_key)) {
 372                         *lm_sess_key = *user_sess_key;
 373                         if (user_sess_key->length) {
 374                                 lm_sess_key->length = 8;
 375                         }
 376                         return NT_STATUS_OK;
 377                 }
 378
 379                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
 380                 if (smb_pwd_check_ntlmv2(mem_ctx,
 381                                          nt_response,
 382                                          stored_nt->hash, challenge,
 383                                          client_username,
 384                                          "",
 385                                          False,
 386                                          user_sess_key)) {
 387                         *lm_sess_key = *user_sess_key;
 388                         if (user_sess_key->length) {
 389                                 lm_sess_key->length = 8;
 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 (lp_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 (lp_lanman_auth() && stored_lanman) {
 409                                         *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 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, becouse 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 (!lp_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 (lp_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                 *lm_sess_key = *user_sess_key;
 499                 if (user_sess_key->length) {
 500                         lm_sess_key->length = 8;
 501                 }
 502                 return NT_STATUS_OK;
 503         }
 504
 505         DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
 506         if (smb_pwd_check_ntlmv2(mem_ctx,
 507                                  lm_response,
 508                                  stored_nt->hash, challenge,
 509                                  client_username,
 510                                  client_domain,
 511                                  True,
 512                                  &tmp_sess_key)) {
 513                 if (nt_response->length > 24) {
 514                         /* If NTLMv2 authentication has preceeded us
 515                          * (even if it failed), then use the session
 516                          * key from that.  See the RPC-SAMLOGON
 517                          * torture test */
 518                         smb_sess_key_ntlmv2(mem_ctx,
 519                                             nt_response,
 520                                             stored_nt->hash, challenge,
 521                                             client_username,
 522                                             client_domain,
 523                                             True,
 524                                             user_sess_key);
 525                 } else {
 526                         /* Otherwise, use the LMv2 session key */
 527                         *user_sess_key = tmp_sess_key;
 528                 }
 529                 *lm_sess_key = *user_sess_key;
 530                 if (user_sess_key->length) {
 531                         lm_sess_key->length = 8;
 532                 }
 533                 return NT_STATUS_OK;
 534         }
 535
 536         DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
 537         if (smb_pwd_check_ntlmv2(mem_ctx,
 538                                  lm_response,
 539                                  stored_nt->hash, challenge,
 540                                  client_username,
 541                                  "",
 542                                  False,
 543                                  &tmp_sess_key)) {
 544                 if (nt_response->length > 24) {
 545                         /* If NTLMv2 authentication has preceeded us
 546                          * (even if it failed), then use the session
 547                          * key from that.  See the RPC-SAMLOGON
 548                          * torture test */
 549                         smb_sess_key_ntlmv2(mem_ctx,
 550                                             nt_response,
 551                                             stored_nt->hash, challenge,
 552                                             client_username,
 553                                             "",
 554                                             False,
 555                                             user_sess_key);
 556                 } else {
 557                         /* Otherwise, use the LMv2 session key */
 558                         *user_sess_key = tmp_sess_key;
 559                 }
 560                 *lm_sess_key = *user_sess_key;
 561                 if (user_sess_key->length) {
 562                         lm_sess_key->length = 8;
 563                 }
 564                 return NT_STATUS_OK;
 565         }
 566
 567         /* Apparently NT accepts NT responses in the LM field
 568            - I think this is related to Win9X pass-though authentication
 569         */
 570         DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
 571         if (lp_ntlm_auth()) {
 572                 if (smb_pwd_check_ntlmv1(mem_ctx,
 573                                          lm_response,
 574                                          stored_nt->hash, challenge,
 575                                          NULL)) {
 576                         /* The session key for this response is still very odd.
 577                            It not very secure, so use it only if we otherwise
 578                            allow LM authentication */
 579
 580                         if (lp_lanman_auth() && stored_lanman) {
 581                                 uint8_t first_8_lm_hash[16];
 582                                 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
 583                                 memset(first_8_lm_hash + 8, '\0', 8);
 584                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 585                                 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 586                         }
 587                         return NT_STATUS_OK;
 588                 }
 589                 DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
 590         } else {
 591                 DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
 592         }
 593
 594         /* Try and match error codes */
 595         if (strchr_m(username, '@')) {
 596                 return NT_STATUS_NOT_FOUND;
 597         }
 598         return NT_STATUS_WRONG_PASSWORD;
 599 }
 600