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