source3/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(DATA_BLOB nt_response,
  32                                  const uchar *part_passwd,
  33                                  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 |"));
  65         dump_data(100, part_passwd, 16);
  66         DEBUG(100,("Password from client was |"));
  67         dump_data(100, nt_response.data, nt_response.length);
  68         DEBUG(100,("Given challenge was |"));
  69         dump_data(100, sec_blob.data, sec_blob.length);
  70         DEBUG(100,("Value from encryption was |"));
  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 < 16) {
 102                 /* We MUST have more than 16 bytes, or the stuff below will go
 103                    crazy... */
 104                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n",
 105                           ntv2_response.length));
 106                 return False;
 107         }
 108
 109         client_key_data = data_blob(ntv2_response.data+16, ntv2_response.length-16);
 110         /*
 111            todo:  should we be checking this for anything?  We can't for LMv2,
 112            but for NTLMv2 it is meant to contain the current time etc.
 113         */
 114
 115         memcpy(client_response, ntv2_response.data, sizeof(client_response));
 116
 117         if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
 118                 return False;
 119         }
 120
 121         SMBOWFencrypt_ntv2(kr, sec_blob, client_key_data, value_from_encryption);
 122         if (user_sess_key != NULL)
 123         {
 124                 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
 125         }
 126
 127 #if DEBUG_PASSWORD
 128         DEBUG(100,("Part password (P16) was |"));
 129         dump_data(100, part_passwd, 16);
 130         DEBUG(100,("Password from client was |"));
 131         dump_data(100, ntv2_response.data, ntv2_response.length);
 132         DEBUG(100,("Variable data from client was |"));
 133         dump_data(100, client_key_data.data, client_key_data.length);
 134         DEBUG(100,("Given challenge was |"));
 135         dump_data(100, sec_blob.data, sec_blob.length);
 136         DEBUG(100,("Value from encryption was |"));
 137         dump_data(100, value_from_encryption, 16);
 138 #endif
 139         data_blob_clear_free(&client_key_data);
 140         return (memcmp(value_from_encryption, client_response, 16) == 0);
 141 }
 142
 143
 144 /****************************************************************************
 145  Do a specific test for an smb password being correct, given a smb_password and
 146  the lanman and NT responses.
 147 ****************************************************************************/
 148 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
 149                                 TALLOC_CTX *mem_ctx,
 150                                 SAM_ACCOUNT *sampass,
 151                                 const auth_usersupplied_info *user_info,
 152                                 uint8 user_sess_key[16])
 153 {
 154         uint16 acct_ctrl;
 155         const uint8 *nt_pw, *lm_pw;
 156         uint32 auth_flags;
 157
 158         acct_ctrl = pdb_get_acct_ctrl(sampass);
 159         if (acct_ctrl & ACB_PWNOTREQ)
 160         {
 161                 if (lp_null_passwords())
 162                 {
 163                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
 164                         return(NT_STATUS_OK);
 165                 }
 166                 else
 167                 {
 168                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
 169                         return(NT_STATUS_LOGON_FAILURE);
 170                 }
 171         }
 172
 173         auth_flags = user_info->auth_flags;
 174
 175         if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 176                 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
 177                          pdb_get_username(sampass)));
 178                 /* No return, we want to check the LM hash below in this case */
 179                 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP |  AUTH_FLAG_NTLM_RESP));
 180         }
 181
 182         if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
 183                 nt_pw = pdb_get_nt_passwd(sampass);
 184                 /* We have the NT MD4 hash challenge available - see if we can
 185                    use it (ie. does it exist in the smbpasswd file).
 186                 */
 187                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password\n"));
 188                 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
 189                                           nt_pw, auth_context->challenge,
 190                                           user_info->smb_name.str,
 191                                           user_info->client_domain.str,
 192                                           user_sess_key))
 193                 {
 194                         return NT_STATUS_OK;
 195                 } else {
 196                         DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
 197                         return NT_STATUS_WRONG_PASSWORD;
 198                 }
 199         } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
 200                 if (lp_ntlm_auth()) {
 201                         nt_pw = pdb_get_nt_passwd(sampass);
 202                         /* We have the NT MD4 hash challenge available - see if we can
 203                            use it (ie. does it exist in the smbpasswd file).
 204                         */
 205                         DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
 206                         if (smb_pwd_check_ntlmv1(user_info->nt_resp,
 207                                                  nt_pw, auth_context->challenge,
 208                                                  user_sess_key))
 209                         {
 210                                 return NT_STATUS_OK;
 211                         } else {
 212                                 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 213                                 return NT_STATUS_WRONG_PASSWORD;
 214                         }
 215                 } else {
 216                         DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 217                         /* no return, becouse we might pick up LMv2 in the LM feild */
 218                 }
 219         }
 220
 221         if (auth_flags & AUTH_FLAG_LM_RESP) {
 222                 if (user_info->lm_resp.length != 24) {
 223                         DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
 224                                  user_info->nt_resp.length, pdb_get_username(sampass)));
 225                 }
 226
 227                 if (!lp_lanman_auth()) {
 228                         DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 229                 } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
 230                         DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 231                 } else {
 232                         lm_pw = pdb_get_lanman_passwd(sampass);
 233
 234                         DEBUG(4,("sam_password_ok: Checking LM password\n"));
 235                         if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 236                                                  lm_pw, auth_context->challenge,
 237                                                  user_sess_key))
 238                         {
 239                                 return NT_STATUS_OK;
 240                         }
 241                 }
 242
 243                 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 244                         DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass)));
 245                         return NT_STATUS_WRONG_PASSWORD;
 246                 }
 247
 248                 nt_pw = pdb_get_nt_passwd(sampass);
 249
 250                 /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 251                    - related to Win9X, legacy NAS pass-though authentication
 252                 */
 253                 DEBUG(4,("sam_password_ok: Checking LMv2 password\n"));
 254                 if (smb_pwd_check_ntlmv2( user_info->lm_resp,
 255                                           nt_pw, auth_context->challenge,
 256                                           user_info->smb_name.str,
 257                                           user_info->client_domain.str,
 258                                           user_sess_key))
 259                 {
 260                         return NT_STATUS_OK;
 261                 }
 262
 263                 /* Apparently NT accepts NT responses in the LM field
 264                    - I think this is related to Win9X pass-though authentication
 265                 */
 266                 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
 267                 if (lp_ntlm_auth())
 268                 {
 269                         if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 270                                                  nt_pw, auth_context->challenge,
 271                                                  user_sess_key))
 272                         {
 273                                 return NT_STATUS_OK;
 274                         }
 275                         DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass)));
 276                         return NT_STATUS_WRONG_PASSWORD;
 277                 } else {
 278                         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)));
 279                         return NT_STATUS_WRONG_PASSWORD;
 280                 }
 281
 282         }
 283
 284         /* Should not be reached, but if they send nothing... */
 285         DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 286         return NT_STATUS_WRONG_PASSWORD;
 287 }
 288
 289 /****************************************************************************
 290  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 291  (ie not disabled, expired and the like).
 292 ****************************************************************************/
 293 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 294                                SAM_ACCOUNT *sampass,
 295                                const auth_usersupplied_info *user_info)
 296 {
 297         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 298         char *workstation_list;
 299         time_t kickoff_time;
 300
 301         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 302
 303         /* Quit if the account was disabled. */
 304         if (acct_ctrl & ACB_DISABLED) {
 305                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 306                 return NT_STATUS_ACCOUNT_DISABLED;
 307         }
 308
 309         /* Test account expire time */
 310
 311         kickoff_time = pdb_get_kickoff_time(sampass);
 312         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 313                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
 314                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 315                 return NT_STATUS_ACCOUNT_EXPIRED;
 316         }
 317
 318         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 319                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 320                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 321
 322                 /* check for immediate expiry "must change at next logon" */
 323                 if (must_change_time == 0 && last_set_time != 0) {
 324                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 325                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 326                 }
 327
 328                 /* check for expired password */
 329                 if (must_change_time < time(NULL) && must_change_time != 0) {
 330                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 331                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 332                         return NT_STATUS_PASSWORD_EXPIRED;
 333                 }
 334         }
 335
 336         /* Test workstation. Workstation list is comma separated. */
 337
 338         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 339
 340         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 341
 342         if (*workstation_list) {
 343                 BOOL invalid_ws = True;
 344                 const char *s = workstation_list;
 345
 346                 fstring tok;
 347
 348                 while (next_token(&s, tok, ",", sizeof(tok))) {
 349                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 350                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 351                         if(strequal(tok, user_info->wksta_name.str)) {
 352                                 invalid_ws = False;
 353                                 break;
 354                         }
 355                 }
 356
 357                 if (invalid_ws)
 358                         return NT_STATUS_INVALID_WORKSTATION;
 359         }
 360
 361         if (acct_ctrl & ACB_DOMTRUST) {
 362                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 363                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 364         }
 365
 366         if (acct_ctrl & ACB_SVRTRUST) {
 367                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 368                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 369         }
 370
 371         if (acct_ctrl & ACB_WSTRUST) {
 372                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 373                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 374         }
 375
 376         return NT_STATUS_OK;
 377 }
 378
 379
 380 /****************************************************************************
 381 check if a username/password is OK assuming the password is a 24 byte
 382 SMB hash supplied in the user_info structure
 383 return an NT_STATUS constant.
 384 ****************************************************************************/
 385
 386 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 387                                    void *my_private_data,
 388                                    TALLOC_CTX *mem_ctx,
 389                                    const auth_usersupplied_info *user_info,
 390                                    auth_serversupplied_info **server_info)
 391 {
 392         SAM_ACCOUNT *sampass=NULL;
 393         BOOL ret;
 394         NTSTATUS nt_status;
 395         uint8 user_sess_key[16];
 396         const uint8* lm_hash;
 397
 398         if (!user_info || !auth_context) {
 399                 return NT_STATUS_UNSUCCESSFUL;
 400         }
 401
 402         /* Can't use the talloc version here, becouse the returned struct gets
 403            kept on the server_info */
 404         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 405                 return nt_status;
 406         }
 407
 408         /* get the account information */
 409
 410         become_root();
 411         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 412         unbecome_root();
 413
 414         if (ret == False)
 415         {
 416                 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 417                 pdb_free_sam(&sampass);
 418                 return NT_STATUS_NO_SUCH_USER;
 419         }
 420
 421         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 422
 423         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
 424
 425         if (!NT_STATUS_IS_OK(nt_status)) {
 426                 pdb_free_sam(&sampass);
 427                 return nt_status;
 428         }
 429
 430         if (!NT_STATUS_IS_OK(nt_status)) {
 431                 pdb_free_sam(&sampass);
 432                 return nt_status;
 433         }
 434
 435         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 436                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 437                 return nt_status;
 438         }
 439
 440         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 441         if (lm_hash) {
 442                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 443         }
 444
 445         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 446
 447         return nt_status;
 448 }
 449
 450 /* module initialisation */
 451 NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 452 {
 453         if (!make_auth_methods(auth_context, auth_method)) {
 454                 return NT_STATUS_NO_MEMORY;
 455         }
 456
 457         (*auth_method)->auth = check_sam_security;
 458         (*auth_method)->name = "sam";
 459         return NT_STATUS_OK;
 460 }
 461
 462
 463 /****************************************************************************
 464 Check SAM security (above) but with a few extra checks.
 465 ****************************************************************************/
 466
 467 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 468                                          void *my_private_data,
 469                                          TALLOC_CTX *mem_ctx,
 470                                          const auth_usersupplied_info *user_info,
 471                                          auth_serversupplied_info **server_info)
 472 {
 473
 474         if (!user_info || !auth_context) {
 475                 return NT_STATUS_LOGON_FAILURE;
 476         }
 477
 478         /* If we are a domain member, we must not
 479            attempt to check the password locally,
 480            unless it is one of our aliases. */
 481
 482         if (!is_myname(user_info->domain.str)) {
 483                 return NT_STATUS_NO_SUCH_USER;
 484         }
 485
 486         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 487 }
 488
 489 /* module initialisation */
 490 NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 491 {
 492         if (!make_auth_methods(auth_context, auth_method)) {
 493                 return NT_STATUS_NO_MEMORY;
 494         }
 495
 496         (*auth_method)->auth = check_samstrict_security;
 497         (*auth_method)->name = "samstrict";
 498         return NT_STATUS_OK;
 499 }
 500
 501