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 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                              const struct samr_Password *client_lanman,
 222                              const struct samr_Password *client_nt,
 223                              const char *username,
 224                              const struct samr_Password *stored_lanman,
 225                              const struct samr_Password *stored_nt)
 226 {
 227         if (stored_nt == NULL) {
 228                 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
 229                          username));
 230         }
 231
 232         if (client_nt && stored_nt) {
 233                 if (memcmp(client_nt->hash, stored_nt->hash, sizeof(stored_nt->hash)) == 0) {
 234                         return NT_STATUS_OK;
 235                 } else {
 236                         DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
 237                                  username));
 238                         return NT_STATUS_WRONG_PASSWORD;
 239                 }
 240
 241         } else if (client_lanman && stored_lanman) {
 242                 if (!lp_lanman_auth()) {
 243                         DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
 244                                  username));
 245                         return NT_STATUS_WRONG_PASSWORD;
 246                 }
 247                 if (strchr_m(username, '@')) {
 248                         return NT_STATUS_NOT_FOUND;
 249                 }
 250
 251                 if (memcmp(client_lanman->hash, stored_lanman->hash, sizeof(stored_lanman->hash)) == 0) {
 252                         return NT_STATUS_OK;
 253                 } else {
 254                         DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
 255                                  username));
 256                         return NT_STATUS_WRONG_PASSWORD;
 257                 }
 258         }
 259         if (strchr_m(username, '@')) {
 260                 return NT_STATUS_NOT_FOUND;
 261         }
 262         return NT_STATUS_WRONG_PASSWORD;
 263 }
 264
 265 /**
 266  * Check a challenge-response password against the value of the NT or
 267  * LM password hash.
 268  *
 269  * @param mem_ctx talloc context
 270  * @param challenge 8-byte challenge.  If all zero, forces plaintext comparison
 271  * @param nt_response 'unicode' NT response to the challenge, or unicode password
 272  * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
 273  * @param username internal Samba username, for log messages
 274  * @param client_username username the client used
 275  * @param client_domain domain name the client used (may be mapped)
 276  * @param stored_lanman LANMAN ASCII password from our passdb or similar
 277  * @param stored_nt MD4 unicode password from our passdb or similar
 278  * @param user_sess_key User session key
 279  * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
 280  */
 281
 282 NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
 283                              uint32_t logon_parameters,
 284                              const DATA_BLOB *challenge,
 285                              const DATA_BLOB *lm_response,
 286                              const DATA_BLOB *nt_response,
 287                              const char *username,
 288                              const char *client_username,
 289                              const char *client_domain,
 290                              const struct samr_Password *stored_lanman,
 291                              const struct samr_Password *stored_nt,
 292                              DATA_BLOB *user_sess_key,
 293                              DATA_BLOB *lm_sess_key)
 294 {
 295         static const uint8_t zeros[8];
 296         DATA_BLOB tmp_sess_key;
 297
 298         if (stored_nt == NULL) {
 299                 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
 300                          username));
 301         }
 302
 303         *lm_sess_key = data_blob(NULL, 0);
 304         *user_sess_key = data_blob(NULL, 0);
 305
 306         /* Check for cleartext netlogon. Used by Exchange 5.5. */
 307         if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
 308             && challenge->length == sizeof(zeros)
 309             && (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
 310                 struct samr_Password client_nt;
 311                 struct samr_Password client_lm;
 312                 char *unix_pw = NULL;
 313                 BOOL lm_ok;
 314
 315                 DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
 316                          username));
 317                 mdfour(client_nt.hash, nt_response->data, nt_response->length);
 318
 319                 if (lm_response->length &&
 320                     (convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX,
 321                                           lm_response->data, lm_response->length,
 322                                            (void **)&unix_pw) != -1)) {
 323                         if (E_deshash(unix_pw, client_lm.hash)) {
 324                                 lm_ok = True;
 325                         } else {
 326                                 lm_ok = False;
 327                         }
 328                 } else {
 329                         lm_ok = False;
 330                 }
 331                 return hash_password_check(mem_ctx,
 332                                            lm_ok ? &client_lm : NULL,
 333                                            nt_response->length ? &client_nt : NULL,
 334                                            username,
 335                                            stored_lanman, stored_nt);
 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 && stored_nt) {
 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                                          stored_nt->hash, challenge,
 351                                          client_username,
 352                                          client_domain,
 353                                          False,
 354                                          user_sess_key)) {
 355                         *lm_sess_key = *user_sess_key;
 356                         if (user_sess_key->length) {
 357                                 lm_sess_key->length = 8;
 358                         }
 359                         return NT_STATUS_OK;
 360                 }
 361
 362                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
 363                 if (smb_pwd_check_ntlmv2(mem_ctx,
 364                                          nt_response,
 365                                          stored_nt->hash, challenge,
 366                                          client_username,
 367                                          client_domain,
 368                                          True,
 369                                          user_sess_key)) {
 370                         *lm_sess_key = *user_sess_key;
 371                         if (user_sess_key->length) {
 372                                 lm_sess_key->length = 8;
 373                         }
 374                         return NT_STATUS_OK;
 375                 }
 376
 377                 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
 378                 if (smb_pwd_check_ntlmv2(mem_ctx,
 379                                          nt_response,
 380                                          stored_nt->hash, challenge,
 381                                          client_username,
 382                                          "",
 383                                          False,
 384                                          user_sess_key)) {
 385                         *lm_sess_key = *user_sess_key;
 386                         if (user_sess_key->length) {
 387                                 lm_sess_key->length = 8;
 388                         }
 389                         return NT_STATUS_OK;
 390                 } else {
 391                         DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
 392                 }
 393         } else if (nt_response->length == 24 && stored_nt) {
 394                 if (lp_ntlm_auth()) {
 395                         /* We have the NT MD4 hash challenge available - see if we can
 396                            use it (ie. does it exist in the smbpasswd file).
 397                         */
 398                         DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
 399                         if (smb_pwd_check_ntlmv1(mem_ctx,
 400                                                  nt_response,
 401                                                  stored_nt->hash, challenge,
 402                                                  user_sess_key)) {
 403                                 /* The LM session key for this response is not very secure,
 404                                    so use it only if we otherwise allow LM authentication */
 405
 406                                 if (lp_lanman_auth() && stored_lanman) {
 407                                         *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 408                                 }
 409                                 return NT_STATUS_OK;
 410                         } else {
 411                                 DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
 412                                          username));
 413                                 return NT_STATUS_WRONG_PASSWORD;
 414                         }
 415                 } else {
 416                         DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
 417                                  username));
 418                         /* no return, becouse we might pick up LMv2 in the LM field */
 419                 }
 420         }
 421
 422         if (lm_response->length == 0) {
 423                 DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
 424                          username));
 425                 return NT_STATUS_WRONG_PASSWORD;
 426         }
 427
 428         if (lm_response->length < 24) {
 429                 DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
 430                          (unsigned long)nt_response->length, username));
 431                 return NT_STATUS_WRONG_PASSWORD;
 432         }
 433
 434         if (!lp_lanman_auth()) {
 435                 DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
 436                          username));
 437         } else if (!stored_lanman) {
 438                 DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
 439                          username));
 440         } else if (strchr_m(username, '@')) {
 441                 DEBUG(3,("ntlm_password_check: NO LanMan password allowed for username@realm logins (user: %s)\n",
 442                          username));
 443         } else {
 444                 DEBUG(4,("ntlm_password_check: Checking LM password\n"));
 445                 if (smb_pwd_check_ntlmv1(mem_ctx,
 446                                          lm_response,
 447                                          stored_lanman->hash, challenge,
 448                                          NULL)) {
 449                         /* The session key for this response is still very odd.
 450                            It not very secure, so use it only if we otherwise
 451                            allow LM authentication */
 452
 453                         if (lp_lanman_auth() && stored_lanman) {
 454                                 uint8_t first_8_lm_hash[16];
 455                                 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
 456                                 memset(first_8_lm_hash + 8, '\0', 8);
 457                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 458                                 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 459                         }
 460                         return NT_STATUS_OK;
 461                 }
 462         }
 463
 464         if (!stored_nt) {
 465                 DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
 466                 return NT_STATUS_WRONG_PASSWORD;
 467         }
 468
 469         /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 470            - related to Win9X, legacy NAS pass-though authentication
 471         */
 472         DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
 473         if (smb_pwd_check_ntlmv2(mem_ctx,
 474                                  lm_response,
 475                                  stored_nt->hash, challenge,
 476                                  client_username,
 477                                  client_domain,
 478                                  False,
 479                                  &tmp_sess_key)) {
 480                 if (nt_response->length > 24) {
 481                         /* If NTLMv2 authentication has preceeded us
 482                          * (even if it failed), then use the session
 483                          * key from that.  See the RPC-SAMLOGON
 484                          * torture test */
 485                         smb_sess_key_ntlmv2(mem_ctx,
 486                                             nt_response,
 487                                             stored_nt->hash, challenge,
 488                                             client_username,
 489                                             client_domain,
 490                                             False,
 491                                             user_sess_key);
 492                 } else {
 493                         /* Otherwise, use the LMv2 session key */
 494                         *user_sess_key = tmp_sess_key;
 495                 }
 496                 *lm_sess_key = *user_sess_key;
 497                 if (user_sess_key->length) {
 498                         lm_sess_key->length = 8;
 499                 }
 500                 return NT_STATUS_OK;
 501         }
 502
 503         DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
 504         if (smb_pwd_check_ntlmv2(mem_ctx,
 505                                  lm_response,
 506                                  stored_nt->hash, challenge,
 507                                  client_username,
 508                                  client_domain,
 509                                  True,
 510                                  &tmp_sess_key)) {
 511                 if (nt_response->length > 24) {
 512                         /* If NTLMv2 authentication has preceeded us
 513                          * (even if it failed), then use the session
 514                          * key from that.  See the RPC-SAMLOGON
 515                          * torture test */
 516                         smb_sess_key_ntlmv2(mem_ctx,
 517                                             nt_response,
 518                                             stored_nt->hash, challenge,
 519                                             client_username,
 520                                             client_domain,
 521                                             True,
 522                                             user_sess_key);
 523                 } else {
 524                         /* Otherwise, use the LMv2 session key */
 525                         *user_sess_key = tmp_sess_key;
 526                 }
 527                 *lm_sess_key = *user_sess_key;
 528                 if (user_sess_key->length) {
 529                         lm_sess_key->length = 8;
 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                 *lm_sess_key = *user_sess_key;
 559                 if (user_sess_key->length) {
 560                         lm_sess_key->length = 8;
 561                 }
 562                 return NT_STATUS_OK;
 563         }
 564
 565         /* Apparently NT accepts NT responses in the LM field
 566            - I think this is related to Win9X pass-though authentication
 567         */
 568         DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
 569         if (lp_ntlm_auth()) {
 570                 if (smb_pwd_check_ntlmv1(mem_ctx,
 571                                          lm_response,
 572                                          stored_nt->hash, challenge,
 573                                          NULL)) {
 574                         /* The session key for this response is still very odd.
 575                            It not very secure, so use it only if we otherwise
 576                            allow LM authentication */
 577
 578                         if (lp_lanman_auth() && stored_lanman) {
 579                                 uint8_t first_8_lm_hash[16];
 580                                 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
 581                                 memset(first_8_lm_hash + 8, '\0', 8);
 582                                 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
 583                                 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
 584                         }
 585                         return NT_STATUS_OK;
 586                 }
 587                 DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
 588         } else {
 589                 DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
 590         }
 591
 592         /* Try and match error codes */
 593         if (strchr_m(username, '@')) {
 594                 return NT_STATUS_NOT_FOUND;
 595         }
 596         return NT_STATUS_WRONG_PASSWORD;
 597 }
 598