source3/auth/auth_sam.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Password and authentication handling
   5    Copyright (C) Andrew Tridgell              1992-2000
   6    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   7    Copyright (C) Andrew Bartlett              2001
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /****************************************************************************
  27 core of smb password checking routine.
  28 ****************************************************************************/
  29 static BOOL smb_pwd_check_ntlmv1(DATA_BLOB nt_response,
  30                                  const uchar *part_passwd,
  31                                  DATA_BLOB sec_blob,
  32                                  uint8 user_sess_key[16])
  33 {
  34         /* Finish the encryption of part_passwd. */
  35         uchar p24[24];
  36
  37         if (part_passwd == NULL) {
  38                 DEBUG(10,("No password set - DISALLOWING access\n"));
  39                 /* No password set - always false ! */
  40                 return False;
  41         }
  42
  43         if (sec_blob.length != 8) {
  44                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%d)\n", sec_blob.length));
  45                 return False;
  46         }
  47
  48         if (nt_response.length != 24) {
  49                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%d)\n", nt_response.length));
  50                 return False;
  51         }
  52
  53         SMBOWFencrypt(part_passwd, sec_blob.data, p24);
  54         if (user_sess_key != NULL)
  55         {
  56                 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key);
  57         }
  58
  59
  60
  61 #if DEBUG_PASSWORD
  62         DEBUG(100,("Part password (P16) was |"));
  63         dump_data(100, part_passwd, 16);
  64         DEBUG(100,("Password from client was |"));
  65         dump_data(100, nt_response.data, nt_response.length);
  66         DEBUG(100,("Given challenge was |"));
  67         dump_data(100, sec_blob.data, sec_blob.length);
  68         DEBUG(100,("Value from encryption was |"));
  69         dump_data(100, p24, 24);
  70 #endif
  71   return (memcmp(p24, nt_response.data, 24) == 0);
  72 }
  73
  74 /****************************************************************************
  75 core of smb password checking routine.
  76 ****************************************************************************/
  77 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB ntv2_response,
  78                                  const uchar *part_passwd,
  79                                  const DATA_BLOB sec_blob,
  80                                  const char *user, const char *domain,
  81                                  uint8 user_sess_key[16])
  82 {
  83         /* Finish the encryption of part_passwd. */
  84         uchar kr[16];
  85         uchar value_from_encryption[16];
  86         uchar client_response[16];
  87         DATA_BLOB client_key_data;
  88
  89         if (part_passwd == NULL)
  90         {
  91                 DEBUG(10,("No password set - DISALLOWING access\n"));
  92                 /* No password set - always False */
  93                 return False;
  94         }
  95
  96         if (ntv2_response.length < 16) {
  97                 /* We MUST have more than 16 bytes, or the stuff below will go
  98                    crazy... */
  99                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%d)\n",
 100                           ntv2_response.length));
 101                 return False;
 102         }
 103
 104         client_key_data = data_blob(ntv2_response.data+16, ntv2_response.length-16);
 105         memcpy(client_response, ntv2_response.data, sizeof(client_response));
 106
 107         ntv2_owf_gen(part_passwd, user, domain, kr);
 108         SMBOWFencrypt_ntv2(kr, sec_blob, client_key_data, (char *)value_from_encryption);
 109         if (user_sess_key != NULL)
 110         {
 111                 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key);
 112         }
 113
 114 #if DEBUG_PASSWORD
 115         DEBUG(100,("Part password (P16) was |"));
 116         dump_data(100, part_passwd, 16);
 117         DEBUG(100,("Password from client was |"));
 118         dump_data(100, ntv2_response.data, ntv2_response.length);
 119         DEBUG(100,("Variable data from client was |"));
 120         dump_data(100, client_key_data.data, client_key_data.length);
 121         DEBUG(100,("Given challenge was |"));
 122         dump_data(100, sec_blob.data, sec_blob.length);
 123         DEBUG(100,("Value from encryption was |"));
 124         dump_data(100, value_from_encryption, 16);
 125 #endif
 126         data_blob_clear_free(&client_key_data);
 127         return (memcmp(value_from_encryption, client_response, 16) == 0);
 128 }
 129
 130
 131 /****************************************************************************
 132  Do a specific test for an smb password being correct, given a smb_password and
 133  the lanman and NT responses.
 134 ****************************************************************************/
 135 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
 136                                 TALLOC_CTX *mem_ctx,
 137                                 SAM_ACCOUNT *sampass,
 138                                 const auth_usersupplied_info *user_info,
 139                                 uint8 user_sess_key[16])
 140 {
 141         uint16 acct_ctrl;
 142         const uint8 *nt_pw, *lm_pw;
 143         uint32 auth_flags;
 144
 145         acct_ctrl = pdb_get_acct_ctrl(sampass);
 146         if (acct_ctrl & ACB_PWNOTREQ)
 147         {
 148                 if (lp_null_passwords())
 149                 {
 150                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
 151                         return(NT_STATUS_OK);
 152                 }
 153                 else
 154                 {
 155                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
 156                         return(NT_STATUS_LOGON_FAILURE);
 157                 }
 158         }
 159
 160         nt_pw = pdb_get_nt_passwd(sampass);
 161         lm_pw = pdb_get_lanman_passwd(sampass);
 162
 163         auth_flags = user_info->auth_flags;
 164
 165         if (nt_pw == NULL) {
 166                 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
 167                          pdb_get_username(sampass)));
 168                 /* No return, we want to check the LM hash below in this case */
 169                 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP |  AUTH_FLAG_NTLM_RESP));
 170         }
 171
 172         if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
 173                 /* We have the NT MD4 hash challenge available - see if we can
 174                    use it (ie. does it exist in the smbpasswd file).
 175                 */
 176                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password\n"));
 177                 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
 178                                           nt_pw, auth_context->challenge,
 179                                           user_info->smb_name.str,
 180                                           user_info->client_domain.str,
 181                                           user_sess_key))
 182                 {
 183                         return NT_STATUS_OK;
 184                 } else {
 185                         DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
 186                         return NT_STATUS_WRONG_PASSWORD;
 187                 }
 188         } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
 189                 if (lp_ntlm_auth()) {
 190                         /* We have the NT MD4 hash challenge available - see if we can
 191                            use it (ie. does it exist in the smbpasswd file).
 192                         */
 193                         DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
 194                         if (smb_pwd_check_ntlmv1(user_info->nt_resp,
 195                                                  nt_pw, auth_context->challenge,
 196                                                  user_sess_key))
 197                         {
 198                                 return NT_STATUS_OK;
 199                         } else {
 200                                 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 201                                 return NT_STATUS_WRONG_PASSWORD;
 202                         }
 203                 } else {
 204                         DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 205                                 /* No return, we want to check the LM hash below in this case */
 206                 }
 207         }
 208
 209         if (lm_pw == NULL) {
 210                 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 211                 auth_flags &= (~AUTH_FLAG_LM_RESP);
 212         }
 213
 214         if (auth_flags & AUTH_FLAG_LM_RESP) {
 215
 216                 if (user_info->lm_resp.length != 24) {
 217                         DEBUG(2,("sam_password_ok: invalid LanMan password length (%d) for user %s\n",
 218                                  user_info->nt_resp.length, pdb_get_username(sampass)));
 219                 }
 220
 221                 if (!lp_lanman_auth()) {
 222                         DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 223                         return NT_STATUS_LOGON_FAILURE;
 224                 }
 225
 226                 DEBUG(4,("sam_password_ok: Checking LM password\n"));
 227                 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 228                                          lm_pw, auth_context->challenge,
 229                                          user_sess_key))
 230                 {
 231                         return NT_STATUS_OK;
 232                 } else {
 233                         DEBUG(4,("sam_password_ok: LM password check failed for user %s\n",pdb_get_username(sampass)));
 234                         return NT_STATUS_WRONG_PASSWORD;
 235                 }
 236         }
 237
 238         /* Should not be reached, but if they send nothing... */
 239         DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 240         return NT_STATUS_WRONG_PASSWORD;
 241 }
 242
 243 /****************************************************************************
 244  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 245  (ie not disabled, expired and the like).
 246 ****************************************************************************/
 247 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 248                                SAM_ACCOUNT *sampass,
 249                                const auth_usersupplied_info *user_info)
 250 {
 251         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 252         char *workstation_list;
 253         time_t kickoff_time;
 254
 255         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 256
 257         /* Quit if the account was disabled. */
 258         if (acct_ctrl & ACB_DISABLED) {
 259                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 260                 return NT_STATUS_ACCOUNT_DISABLED;
 261         }
 262
 263         /* Test account expire time */
 264
 265         kickoff_time = pdb_get_kickoff_time(sampass);
 266         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 267                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
 268                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 269                 return NT_STATUS_ACCOUNT_EXPIRED;
 270         }
 271
 272         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 273                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 274                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 275
 276                 /* check for immediate expiry "must change at next logon" */
 277                 if (must_change_time == 0 && last_set_time != 0) {
 278                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 279                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 280                 }
 281
 282                 /* check for expired password */
 283                 if (must_change_time < time(NULL) && must_change_time != 0) {
 284                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 285                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 286                         return NT_STATUS_PASSWORD_EXPIRED;
 287                 }
 288         }
 289
 290         /* Test workstation. Workstation list is comma separated. */
 291
 292         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 293
 294         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 295
 296         if (*workstation_list) {
 297                 BOOL invalid_ws = True;
 298                 char *s = workstation_list;
 299
 300                 fstring tok;
 301
 302                 while (next_token(&s, tok, ",", sizeof(tok))) {
 303                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 304                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 305                         if(strequal(tok, user_info->wksta_name.str)) {
 306                                 invalid_ws = False;
 307                                 break;
 308                         }
 309                 }
 310
 311                 if (invalid_ws)
 312                         return NT_STATUS_INVALID_WORKSTATION;
 313         }
 314
 315         if (acct_ctrl & ACB_DOMTRUST) {
 316                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 317                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 318         }
 319
 320         if (acct_ctrl & ACB_SVRTRUST) {
 321                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 322                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 323         }
 324
 325         if (acct_ctrl & ACB_WSTRUST) {
 326                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 327                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 328         }
 329
 330         return NT_STATUS_OK;
 331 }
 332
 333
 334 /****************************************************************************
 335 check if a username/password is OK assuming the password is a 24 byte
 336 SMB hash supplied in the user_info structure
 337 return an NT_STATUS constant.
 338 ****************************************************************************/
 339
 340 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 341                                    void *my_private_data,
 342                                    TALLOC_CTX *mem_ctx,
 343                                    const auth_usersupplied_info *user_info,
 344                                    auth_serversupplied_info **server_info)
 345 {
 346         SAM_ACCOUNT *sampass=NULL;
 347         BOOL ret;
 348         NTSTATUS nt_status;
 349         uint8 user_sess_key[16];
 350         const uint8* lm_hash;
 351
 352         if (!user_info || !auth_context) {
 353                 return NT_STATUS_UNSUCCESSFUL;
 354         }
 355
 356         /* Can't use the talloc version here, becouse the returned struct gets
 357            kept on the server_info */
 358         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 359                 return nt_status;
 360         }
 361
 362         /* get the account information */
 363
 364         become_root();
 365         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 366         unbecome_root();
 367
 368         if (ret == False)
 369         {
 370                 DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 371                 pdb_free_sam(&sampass);
 372                 return NT_STATUS_NO_SUCH_USER;
 373         }
 374
 375         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
 376
 377         if (!NT_STATUS_IS_OK(nt_status)) {
 378                 pdb_free_sam(&sampass);
 379                 return nt_status;
 380         }
 381
 382         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 383
 384         if (!NT_STATUS_IS_OK(nt_status)) {
 385                 pdb_free_sam(&sampass);
 386                 return nt_status;
 387         }
 388
 389         if (!make_server_info_sam(server_info, sampass)) {
 390                 DEBUG(0,("failed to malloc memory for server_info\n"));
 391                 return NT_STATUS_NO_MEMORY;
 392         }
 393
 394         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 395         if (lm_hash) {
 396                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 397         }
 398
 399         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 400
 401         return nt_status;
 402 }
 403
 404 /* module initialisation */
 405 BOOL auth_init_sam(struct auth_context *auth_context, auth_methods **auth_method)
 406 {
 407         if (!make_auth_methods(auth_context, auth_method)) {
 408                 return False;
 409         }
 410
 411         (*auth_method)->auth = check_sam_security;
 412         return True;
 413 }
 414
 415
 416 /****************************************************************************
 417 Check SAM security (above) but with a few extra checks.
 418 ****************************************************************************/
 419
 420 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 421                                          void *my_private_data,
 422                                          TALLOC_CTX *mem_ctx,
 423                                          const auth_usersupplied_info *user_info,
 424                                          auth_serversupplied_info **server_info)
 425 {
 426
 427         if (!user_info || !auth_context) {
 428                 return NT_STATUS_LOGON_FAILURE;
 429         }
 430
 431         /* If we are a domain member, we must not
 432            attempt to check the password locally,
 433            unless it is one of our aliases. */
 434
 435         if (!is_netbios_alias_or_name(user_info->domain.str)) {
 436                 return NT_STATUS_NO_SUCH_USER;
 437         }
 438
 439         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 440 }
 441
 442 /* module initialisation */
 443 BOOL auth_init_samstrict(struct auth_context *auth_context, auth_methods **auth_method)
 444 {
 445         if (!make_auth_methods(auth_context, auth_method)) {
 446                 return False;
 447         }
 448
 449         (*auth_method)->auth = check_samstrict_security;
 450         return True;
 451 }
 452
 453