source/auth/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell              1992-2000
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   6    Copyright (C) Andrew Bartlett              2001
   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
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_AUTH
  27
  28 /****************************************************************************
  29 core of smb password checking routine.
  30 ****************************************************************************/
  31 static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
  32                                  const uchar *part_passwd,
  33                                  const DATA_BLOB *sec_blob,
  34                                  uint8 user_sess_key[16])
  35 {
  36         /* Finish the encryption of part_passwd. */
  37         uchar p24[24];
  38
  39         if (part_passwd == NULL) {
  40                 DEBUG(10,("No password set - DISALLOWING access\n"));
  41                 /* No password set - always false ! */
  42                 return False;
  43         }
  44
  45         if (sec_blob->length != 8) {
  46                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%d)\n", sec_blob->length));
  47                 return False;
  48         }
  49
  50         if (nt_response->length != 24) {
  51                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%d)\n", nt_response->length));
  52                 return False;
  53         }
  54
  55         SMBOWFencrypt(part_passwd, sec_blob->data, p24);
  56         if (user_sess_key != NULL)
  57         {
  58                 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key);
  59         }
  60
  61
  62
  63 #if DEBUG_PASSWORD
  64         DEBUG(100,("Part password (P16) was |\n"));
  65         dump_data(100, part_passwd, 16);
  66         DEBUGADD(100,("Password from client was |\n"));
  67         dump_data(100, nt_response->data, nt_response->length);
  68         DEBUGADD(100,("Given challenge was |\n"));
  69         dump_data(100, sec_blob->data, sec_blob->length);
  70         DEBUGADD(100,("Value from encryption was |\n"));
  71         dump_data(100, p24, 24);
  72 #endif
  73   return (memcmp(p24, nt_response->data, 24) == 0);
  74 }
  75
  76
  77 /****************************************************************************
  78 core of smb password checking routine. (NTLMv2, LMv2)
  79
  80 Note:  The same code works with both NTLMv2 and LMv2.
  81 ****************************************************************************/
  82 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
  83                                  const uchar *part_passwd,
  84                                  const DATA_BLOB *sec_blob,
  85                                  const char *user, const char *domain,
  86                                  uint8 user_sess_key[16])
  87 {
  88         /* Finish the encryption of part_passwd. */
  89         uchar kr[16];
  90         uchar value_from_encryption[16];
  91         uchar client_response[16];
  92         DATA_BLOB client_key_data;
  93
  94         if (part_passwd == NULL)
  95         {
  96                 DEBUG(10,("No password set - DISALLOWING access\n"));
  97                 /* No password set - always False */
  98                 return False;
  99         }
 100
 101         if (ntv2_response->length < 24) {
 102                 /* We MUST have more than 16 bytes, or the stuff below will go
 103                    crazy.  No known implementation sends less than the 24 bytes
 104                    for LMv2, let alone NTLMv2. */
 105                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n",
 106                           ntv2_response->length));
 107                 return False;
 108         }
 109
 110         client_key_data = data_blob(ntv2_response->data+16, ntv2_response->length-16);
 111         /*
 112            todo:  should we be checking this for anything?  We can't for LMv2,
 113            but for NTLMv2 it is meant to contain the current time etc.
 114         */
 115
 116         memcpy(client_response, ntv2_response->data, sizeof(client_response));
 117
 118         if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
 119                 return False;
 120         }
 121
 122         SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
 123         if (user_sess_key != NULL)
 124         {
 125                 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
 126         }
 127
 128 #if DEBUG_PASSWORD
 129         DEBUG(100,("Part password (P16) was |\n"));
 130         dump_data(100, part_passwd, 16);
 131         DEBUGADD(100,("Password from client was |\n"));
 132         dump_data(100, ntv2_response->data, ntv2_response->length);
 133         DEBUGADD(100,("Variable data from client was |\n"));
 134         dump_data(100, client_key_data.data, client_key_data.length);
 135         DEBUGADD(100,("Given challenge was |\n"));
 136         dump_data(100, sec_blob->data, sec_blob->length);
 137         DEBUGADD(100,("Value from encryption was |\n"));
 138         dump_data(100, value_from_encryption, 16);
 139 #endif
 140         data_blob_clear_free(&client_key_data);
 141         return (memcmp(value_from_encryption, client_response, 16) == 0);
 142 }
 143
 144
 145 /****************************************************************************
 146  Do a specific test for an smb password being correct, given a smb_password and
 147  the lanman and NT responses.
 148 ****************************************************************************/
 149 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
 150                                 TALLOC_CTX *mem_ctx,
 151                                 SAM_ACCOUNT *sampass,
 152                                 const auth_usersupplied_info *user_info,
 153                                 uint8 user_sess_key[16])
 154 {
 155         uint16 acct_ctrl;
 156         const uint8 *nt_pw, *lm_pw;
 157         uint32 auth_flags;
 158
 159         acct_ctrl = pdb_get_acct_ctrl(sampass);
 160         if (acct_ctrl & ACB_PWNOTREQ)
 161         {
 162                 if (lp_null_passwords())
 163                 {
 164                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
 165                         return(NT_STATUS_OK);
 166                 }
 167                 else
 168                 {
 169                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
 170                         return(NT_STATUS_LOGON_FAILURE);
 171                 }
 172         }
 173
 174         auth_flags = user_info->auth_flags;
 175
 176         if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 177                 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
 178                          pdb_get_username(sampass)));
 179                 /* No return, we want to check the LM hash below in this case */
 180                 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP |  AUTH_FLAG_NTLM_RESP));
 181         }
 182
 183         if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
 184                 nt_pw = pdb_get_nt_passwd(sampass);
 185                 /* We have the NT MD4 hash challenge available - see if we can
 186                    use it (ie. does it exist in the smbpasswd file).
 187                 */
 188                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", user_info->client_domain.str));
 189                 if (smb_pwd_check_ntlmv2( &user_info->nt_resp,
 190                                           nt_pw, &auth_context->challenge,
 191                                           user_info->smb_name.str,
 192                                           user_info->client_domain.str,
 193                                           user_sess_key))
 194                 {
 195                         return NT_STATUS_OK;
 196                 }
 197
 198                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
 199                 if (smb_pwd_check_ntlmv2( &user_info->nt_resp,
 200                                           nt_pw, &auth_context->challenge,
 201                                           user_info->smb_name.str,
 202                                           "",
 203                                           user_sess_key))
 204                 {
 205                         return NT_STATUS_OK;
 206                 } else {
 207                         DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
 208                         return NT_STATUS_WRONG_PASSWORD;
 209                 }
 210         } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
 211                 if (lp_ntlm_auth()) {
 212                         nt_pw = pdb_get_nt_passwd(sampass);
 213                         /* We have the NT MD4 hash challenge available - see if we can
 214                            use it (ie. does it exist in the smbpasswd file).
 215                         */
 216                         DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
 217                         if (smb_pwd_check_ntlmv1(&user_info->nt_resp,
 218                                                  nt_pw, &auth_context->challenge,
 219                                                  user_sess_key))
 220                         {
 221                                 return NT_STATUS_OK;
 222                         } else {
 223                                 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 224                                 return NT_STATUS_WRONG_PASSWORD;
 225                         }
 226                 } else {
 227                         DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 228                         /* no return, becouse we might pick up LMv2 in the LM feild */
 229                 }
 230         }
 231
 232         if (auth_flags & AUTH_FLAG_LM_RESP) {
 233                 if (user_info->lm_resp.length != 24) {
 234                         DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
 235                                  user_info->nt_resp.length, pdb_get_username(sampass)));
 236                 }
 237
 238                 if (!lp_lanman_auth()) {
 239                         DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 240                 } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
 241                         DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 242                 } else {
 243                         lm_pw = pdb_get_lanman_passwd(sampass);
 244
 245                         DEBUG(4,("sam_password_ok: Checking LM password\n"));
 246                         if (smb_pwd_check_ntlmv1(&user_info->lm_resp,
 247                                                  lm_pw, &auth_context->challenge,
 248                                                  user_sess_key))
 249                         {
 250                                 return NT_STATUS_OK;
 251                         }
 252                 }
 253
 254                 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 255                         DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass)));
 256                         return NT_STATUS_WRONG_PASSWORD;
 257                 }
 258
 259                 nt_pw = pdb_get_nt_passwd(sampass);
 260
 261                 /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 262                    - related to Win9X, legacy NAS pass-though authentication
 263                 */
 264                 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info->client_domain.str));
 265                 if (smb_pwd_check_ntlmv2( &user_info->lm_resp,
 266                                           nt_pw, &auth_context->challenge,
 267                                           user_info->smb_name.str,
 268                                           user_info->client_domain.str,
 269                                           user_sess_key))
 270                 {
 271                         return NT_STATUS_OK;
 272                 }
 273
 274                 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
 275                 if (smb_pwd_check_ntlmv2( &user_info->lm_resp,
 276                                           nt_pw, &auth_context->challenge,
 277                                           user_info->smb_name.str,
 278                                           "",
 279                                           user_sess_key))
 280                 {
 281                         return NT_STATUS_OK;
 282                 }
 283
 284                 /* Apparently NT accepts NT responses in the LM field
 285                    - I think this is related to Win9X pass-though authentication
 286                 */
 287                 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
 288                 if (lp_ntlm_auth())
 289                 {
 290                         if (smb_pwd_check_ntlmv1(&user_info->lm_resp,
 291                                                  nt_pw, &auth_context->challenge,
 292                                                  user_sess_key))
 293                         {
 294                                 return NT_STATUS_OK;
 295                         }
 296                         DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass)));
 297                         return NT_STATUS_WRONG_PASSWORD;
 298                 } else {
 299                         DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",pdb_get_username(sampass)));
 300                         return NT_STATUS_WRONG_PASSWORD;
 301                 }
 302
 303         }
 304
 305         /* Should not be reached, but if they send nothing... */
 306         DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 307         return NT_STATUS_WRONG_PASSWORD;
 308 }
 309
 310 /****************************************************************************
 311  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 312  (ie not disabled, expired and the like).
 313 ****************************************************************************/
 314 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 315                                SAM_ACCOUNT *sampass,
 316                                const auth_usersupplied_info *user_info)
 317 {
 318         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 319         char *workstation_list;
 320         time_t kickoff_time;
 321
 322         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 323
 324         /* Quit if the account was disabled. */
 325         if (acct_ctrl & ACB_DISABLED) {
 326                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 327                 return NT_STATUS_ACCOUNT_DISABLED;
 328         }
 329
 330         /* Test account expire time */
 331
 332         kickoff_time = pdb_get_kickoff_time(sampass);
 333         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 334                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
 335                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 336                 return NT_STATUS_ACCOUNT_EXPIRED;
 337         }
 338
 339         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 340                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 341                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 342
 343                 /* check for immediate expiry "must change at next logon" */
 344                 if (must_change_time == 0 && last_set_time != 0) {
 345                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 346                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 347                 }
 348
 349                 /* check for expired password */
 350                 if (must_change_time < time(NULL) && must_change_time != 0) {
 351                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 352                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 353                         return NT_STATUS_PASSWORD_EXPIRED;
 354                 }
 355         }
 356
 357         /* Test workstation. Workstation list is comma separated. */
 358
 359         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 360
 361         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 362
 363         if (*workstation_list) {
 364                 BOOL invalid_ws = True;
 365                 const char *s = workstation_list;
 366
 367                 fstring tok;
 368
 369                 while (next_token(&s, tok, ",", sizeof(tok))) {
 370                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 371                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 372                         if(strequal(tok, user_info->wksta_name.str)) {
 373                                 invalid_ws = False;
 374                                 break;
 375                         }
 376                 }
 377
 378                 if (invalid_ws)
 379                         return NT_STATUS_INVALID_WORKSTATION;
 380         }
 381
 382         if (acct_ctrl & ACB_DOMTRUST) {
 383                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 384                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 385         }
 386
 387         if (acct_ctrl & ACB_SVRTRUST) {
 388                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 389                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 390         }
 391
 392         if (acct_ctrl & ACB_WSTRUST) {
 393                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 394                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 395         }
 396
 397         return NT_STATUS_OK;
 398 }
 399
 400
 401 /****************************************************************************
 402 check if a username/password is OK assuming the password is a 24 byte
 403 SMB hash supplied in the user_info structure
 404 return an NT_STATUS constant.
 405 ****************************************************************************/
 406
 407 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 408                                    void *my_private_data,
 409                                    TALLOC_CTX *mem_ctx,
 410                                    const auth_usersupplied_info *user_info,
 411                                    auth_serversupplied_info **server_info)
 412 {
 413         SAM_ACCOUNT *sampass=NULL;
 414         BOOL ret;
 415         NTSTATUS nt_status;
 416         uint8 user_sess_key[16];
 417         const uint8* lm_hash;
 418
 419         if (!user_info || !auth_context) {
 420                 return NT_STATUS_UNSUCCESSFUL;
 421         }
 422
 423         /* Can't use the talloc version here, becouse the returned struct gets
 424            kept on the server_info */
 425         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 426                 return nt_status;
 427         }
 428
 429         /* get the account information */
 430
 431         become_root();
 432         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 433         unbecome_root();
 434
 435         if (ret == False)
 436         {
 437                 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 438                 pdb_free_sam(&sampass);
 439                 return NT_STATUS_NO_SUCH_USER;
 440         }
 441
 442         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 443
 444         if (!NT_STATUS_IS_OK(nt_status)) {
 445                 pdb_free_sam(&sampass);
 446                 return nt_status;
 447         }
 448
 449         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
 450
 451         if (!NT_STATUS_IS_OK(nt_status)) {
 452                 pdb_free_sam(&sampass);
 453                 return nt_status;
 454         }
 455
 456         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 457                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 458                 return nt_status;
 459         }
 460
 461         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 462         if (lm_hash) {
 463                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 464         }
 465
 466         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 467
 468         return nt_status;
 469 }
 470
 471 /* module initialisation */
 472 NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 473 {
 474         if (!make_auth_methods(auth_context, auth_method)) {
 475                 return NT_STATUS_NO_MEMORY;
 476         }
 477
 478         (*auth_method)->auth = check_sam_security;
 479         (*auth_method)->name = "sam";
 480         return NT_STATUS_OK;
 481 }
 482
 483
 484 /****************************************************************************
 485 Check SAM security (above) but with a few extra checks.
 486 ****************************************************************************/
 487
 488 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 489                                          void *my_private_data,
 490                                          TALLOC_CTX *mem_ctx,
 491                                          const auth_usersupplied_info *user_info,
 492                                          auth_serversupplied_info **server_info)
 493 {
 494
 495         if (!user_info || !auth_context) {
 496                 return NT_STATUS_LOGON_FAILURE;
 497         }
 498
 499         /* If we are a domain member, we must not
 500            attempt to check the password locally,
 501            unless it is one of our aliases. */
 502
 503         if (!is_myname(user_info->domain.str)) {
 504                 return NT_STATUS_NO_SUCH_USER;
 505         }
 506
 507         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 508 }
 509
 510 /* module initialisation */
 511 NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 512 {
 513         if (!make_auth_methods(auth_context, auth_method)) {
 514                 return NT_STATUS_NO_MEMORY;
 515         }
 516
 517         (*auth_method)->auth = check_samstrict_security;
 518         (*auth_method)->name = "samstrict";
 519         return NT_STATUS_OK;
 520 }
 521
 522 NTSTATUS auth_sam_init(void)
 523 {
 524         smb_register_auth(AUTH_INTERFACE_VERSION, "samstrict", auth_init_samstrict);
 525         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 526         return NT_STATUS_OK;
 527 }