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 with domain [%s]\n", user_info->client_domain.str));
 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                 }
 196
 197                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
 198                 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
 199                                           nt_pw, auth_context->challenge,
 200                                           user_info->smb_name.str,
 201                                           "",
 202                                           user_sess_key))
 203                 {
 204                         return NT_STATUS_OK;
 205                 } else {
 206                         DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
 207                         return NT_STATUS_WRONG_PASSWORD;
 208                 }
 209         } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
 210                 if (lp_ntlm_auth()) {
 211                         nt_pw = pdb_get_nt_passwd(sampass);
 212                         /* We have the NT MD4 hash challenge available - see if we can
 213                            use it (ie. does it exist in the smbpasswd file).
 214                         */
 215                         DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
 216                         if (smb_pwd_check_ntlmv1(user_info->nt_resp,
 217                                                  nt_pw, auth_context->challenge,
 218                                                  user_sess_key))
 219                         {
 220                                 return NT_STATUS_OK;
 221                         } else {
 222                                 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 223                                 return NT_STATUS_WRONG_PASSWORD;
 224                         }
 225                 } else {
 226                         DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 227                         /* no return, becouse we might pick up LMv2 in the LM feild */
 228                 }
 229         }
 230
 231         if (auth_flags & AUTH_FLAG_LM_RESP) {
 232                 if (user_info->lm_resp.length != 24) {
 233                         DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
 234                                  user_info->nt_resp.length, pdb_get_username(sampass)));
 235                 }
 236
 237                 if (!lp_lanman_auth()) {
 238                         DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 239                 } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
 240                         DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 241                 } else {
 242                         lm_pw = pdb_get_lanman_passwd(sampass);
 243
 244                         DEBUG(4,("sam_password_ok: Checking LM password\n"));
 245                         if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 246                                                  lm_pw, auth_context->challenge,
 247                                                  user_sess_key))
 248                         {
 249                                 return NT_STATUS_OK;
 250                         }
 251                 }
 252
 253                 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 254                         DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass)));
 255                         return NT_STATUS_WRONG_PASSWORD;
 256                 }
 257
 258                 nt_pw = pdb_get_nt_passwd(sampass);
 259
 260                 /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 261                    - related to Win9X, legacy NAS pass-though authentication
 262                 */
 263                 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info->client_domain.str));
 264                 if (smb_pwd_check_ntlmv2( user_info->lm_resp,
 265                                           nt_pw, auth_context->challenge,
 266                                           user_info->smb_name.str,
 267                                           user_info->client_domain.str,
 268                                           user_sess_key))
 269                 {
 270                         return NT_STATUS_OK;
 271                 }
 272
 273                 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
 274                 if (smb_pwd_check_ntlmv2( user_info->lm_resp,
 275                                           nt_pw, auth_context->challenge,
 276                                           user_info->smb_name.str,
 277                                           "",
 278                                           user_sess_key))
 279                 {
 280                         return NT_STATUS_OK;
 281                 }
 282
 283                 /* Apparently NT accepts NT responses in the LM field
 284                    - I think this is related to Win9X pass-though authentication
 285                 */
 286                 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
 287                 if (lp_ntlm_auth())
 288                 {
 289                         if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 290                                                  nt_pw, auth_context->challenge,
 291                                                  user_sess_key))
 292                         {
 293                                 return NT_STATUS_OK;
 294                         }
 295                         DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass)));
 296                         return NT_STATUS_WRONG_PASSWORD;
 297                 } else {
 298                         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)));
 299                         return NT_STATUS_WRONG_PASSWORD;
 300                 }
 301
 302         }
 303
 304         /* Should not be reached, but if they send nothing... */
 305         DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 306         return NT_STATUS_WRONG_PASSWORD;
 307 }
 308
 309 /****************************************************************************
 310  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 311  (ie not disabled, expired and the like).
 312 ****************************************************************************/
 313 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 314                                SAM_ACCOUNT *sampass,
 315                                const auth_usersupplied_info *user_info)
 316 {
 317         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 318         char *workstation_list;
 319         time_t kickoff_time;
 320
 321         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 322
 323         /* Quit if the account was disabled. */
 324         if (acct_ctrl & ACB_DISABLED) {
 325                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 326                 return NT_STATUS_ACCOUNT_DISABLED;
 327         }
 328
 329         /* Test account expire time */
 330
 331         kickoff_time = pdb_get_kickoff_time(sampass);
 332         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 333                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
 334                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 335                 return NT_STATUS_ACCOUNT_EXPIRED;
 336         }
 337
 338         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 339                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 340                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 341
 342                 /* check for immediate expiry "must change at next logon" */
 343                 if (must_change_time == 0 && last_set_time != 0) {
 344                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 345                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 346                 }
 347
 348                 /* check for expired password */
 349                 if (must_change_time < time(NULL) && must_change_time != 0) {
 350                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 351                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 352                         return NT_STATUS_PASSWORD_EXPIRED;
 353                 }
 354         }
 355
 356         /* Test workstation. Workstation list is comma separated. */
 357
 358         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 359
 360         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 361
 362         if (*workstation_list) {
 363                 BOOL invalid_ws = True;
 364                 const char *s = workstation_list;
 365
 366                 fstring tok;
 367
 368                 while (next_token(&s, tok, ",", sizeof(tok))) {
 369                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 370                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 371                         if(strequal(tok, user_info->wksta_name.str)) {
 372                                 invalid_ws = False;
 373                                 break;
 374                         }
 375                 }
 376
 377                 if (invalid_ws)
 378                         return NT_STATUS_INVALID_WORKSTATION;
 379         }
 380
 381         if (acct_ctrl & ACB_DOMTRUST) {
 382                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 383                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 384         }
 385
 386         if (acct_ctrl & ACB_SVRTRUST) {
 387                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 388                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 389         }
 390
 391         if (acct_ctrl & ACB_WSTRUST) {
 392                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 393                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 394         }
 395
 396         return NT_STATUS_OK;
 397 }
 398
 399
 400 /****************************************************************************
 401 check if a username/password is OK assuming the password is a 24 byte
 402 SMB hash supplied in the user_info structure
 403 return an NT_STATUS constant.
 404 ****************************************************************************/
 405
 406 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 407                                    void *my_private_data,
 408                                    TALLOC_CTX *mem_ctx,
 409                                    const auth_usersupplied_info *user_info,
 410                                    auth_serversupplied_info **server_info)
 411 {
 412         SAM_ACCOUNT *sampass=NULL;
 413         BOOL ret;
 414         NTSTATUS nt_status;
 415         uint8 user_sess_key[16];
 416         const uint8* lm_hash;
 417
 418         if (!user_info || !auth_context) {
 419                 return NT_STATUS_UNSUCCESSFUL;
 420         }
 421
 422         /* Can't use the talloc version here, becouse the returned struct gets
 423            kept on the server_info */
 424         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 425                 return nt_status;
 426         }
 427
 428         /* get the account information */
 429
 430         become_root();
 431         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 432         unbecome_root();
 433
 434         if (ret == False)
 435         {
 436                 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 437                 pdb_free_sam(&sampass);
 438                 return NT_STATUS_NO_SUCH_USER;
 439         }
 440
 441         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 442
 443         if (!NT_STATUS_IS_OK(nt_status)) {
 444                 pdb_free_sam(&sampass);
 445                 return nt_status;
 446         }
 447
 448         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
 449
 450         if (!NT_STATUS_IS_OK(nt_status)) {
 451                 pdb_free_sam(&sampass);
 452                 return nt_status;
 453         }
 454
 455         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 456                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 457                 return nt_status;
 458         }
 459
 460         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 461         if (lm_hash) {
 462                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 463         }
 464
 465         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 466
 467         return nt_status;
 468 }
 469
 470 /* module initialisation */
 471 NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 472 {
 473         if (!make_auth_methods(auth_context, auth_method)) {
 474                 return NT_STATUS_NO_MEMORY;
 475         }
 476
 477         (*auth_method)->auth = check_sam_security;
 478         (*auth_method)->name = "sam";
 479         return NT_STATUS_OK;
 480 }
 481
 482
 483 /****************************************************************************
 484 Check SAM security (above) but with a few extra checks.
 485 ****************************************************************************/
 486
 487 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 488                                          void *my_private_data,
 489                                          TALLOC_CTX *mem_ctx,
 490                                          const auth_usersupplied_info *user_info,
 491                                          auth_serversupplied_info **server_info)
 492 {
 493
 494         if (!user_info || !auth_context) {
 495                 return NT_STATUS_LOGON_FAILURE;
 496         }
 497
 498         /* If we are a domain member, we must not
 499            attempt to check the password locally,
 500            unless it is one of our aliases. */
 501
 502         if (!is_myname(user_info->domain.str)) {
 503                 return NT_STATUS_NO_SUCH_USER;
 504         }
 505
 506         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 507 }
 508
 509 /* module initialisation */
 510 NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 511 {
 512         if (!make_auth_methods(auth_context, auth_method)) {
 513                 return NT_STATUS_NO_MEMORY;
 514         }
 515
 516         (*auth_method)->auth = check_samstrict_security;
 517         (*auth_method)->name = "samstrict";
 518         return NT_STATUS_OK;
 519 }
 520
 521