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