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