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         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         nt_pw = pdb_get_nt_passwd(sampass);
 166         lm_pw = pdb_get_lanman_passwd(sampass);
 167
 168         auth_flags = user_info->auth_flags;
 169
 170         if (nt_pw == NULL) {
 171                 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
 172                          pdb_get_username(sampass)));
 173                 /* No return, we want to check the LM hash below in this case */
 174                 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP |  AUTH_FLAG_NTLM_RESP));
 175         }
 176
 177         if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
 178                 /* We have the NT MD4 hash challenge available - see if we can
 179                    use it (ie. does it exist in the smbpasswd file).
 180                 */
 181                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password\n"));
 182                 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
 183                                           nt_pw, auth_context->challenge,
 184                                           user_info->smb_name.str,
 185                                           user_info->client_domain.str,
 186                                           user_sess_key))
 187                 {
 188                         return NT_STATUS_OK;
 189                 } else {
 190                         DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
 191                         return NT_STATUS_WRONG_PASSWORD;
 192                 }
 193         } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
 194                 if (lp_ntlm_auth()) {
 195                         /* We have the NT MD4 hash challenge available - see if we can
 196                            use it (ie. does it exist in the smbpasswd file).
 197                         */
 198                         DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
 199                         if (smb_pwd_check_ntlmv1(user_info->nt_resp,
 200                                                  nt_pw, auth_context->challenge,
 201                                                  user_sess_key))
 202                         {
 203                                 return NT_STATUS_OK;
 204                         } else {
 205                                 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 206                                 return NT_STATUS_WRONG_PASSWORD;
 207                         }
 208                 } else {
 209                         DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 210                                 /* No return, we want to check the LM hash below in this case */
 211                 }
 212         }
 213
 214         if (lm_pw == NULL) {
 215                 DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 216                 auth_flags &= (~AUTH_FLAG_LM_RESP);
 217         }
 218
 219         if (auth_flags & AUTH_FLAG_LM_RESP) {
 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()) {
 239                                 /* Apparently NT accepts NT responses in the LM field
 240                                    - I think this is related to Win9X pass-though authentication
 241                                 */
 242                                 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
 243                                 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 244                                                          nt_pw, auth_context->challenge,
 245                                                          user_sess_key))
 246                                 {
 247                                         return NT_STATUS_OK;
 248                                 } else {
 249                                         DEBUG(3,("sam_password_ok: NT MD4 password in LM field failed for user %s\n",pdb_get_username(sampass)));
 250                                         return NT_STATUS_WRONG_PASSWORD;
 251                                 }
 252                         }
 253                         DEBUG(4,("sam_password_ok: LM password check failed for user %s\n",pdb_get_username(sampass)));
 254                         return NT_STATUS_WRONG_PASSWORD;
 255                 }
 256         }
 257
 258         /* Should not be reached, but if they send nothing... */
 259         DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 260         return NT_STATUS_WRONG_PASSWORD;
 261 }
 262
 263 /****************************************************************************
 264  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 265  (ie not disabled, expired and the like).
 266 ****************************************************************************/
 267 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 268                                SAM_ACCOUNT *sampass,
 269                                const auth_usersupplied_info *user_info)
 270 {
 271         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 272         char *workstation_list;
 273         time_t kickoff_time;
 274
 275         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 276
 277         /* Quit if the account was disabled. */
 278         if (acct_ctrl & ACB_DISABLED) {
 279                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 280                 return NT_STATUS_ACCOUNT_DISABLED;
 281         }
 282
 283         /* Test account expire time */
 284
 285         kickoff_time = pdb_get_kickoff_time(sampass);
 286         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 287                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
 288                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 289                 return NT_STATUS_ACCOUNT_EXPIRED;
 290         }
 291
 292         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 293                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 294                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 295
 296                 /* check for immediate expiry "must change at next logon" */
 297                 if (must_change_time == 0 && last_set_time != 0) {
 298                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 299                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 300                 }
 301
 302                 /* check for expired password */
 303                 if (must_change_time < time(NULL) && must_change_time != 0) {
 304                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 305                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 306                         return NT_STATUS_PASSWORD_EXPIRED;
 307                 }
 308         }
 309
 310         /* Test workstation. Workstation list is comma separated. */
 311
 312         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 313
 314         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 315
 316         if (*workstation_list) {
 317                 BOOL invalid_ws = True;
 318                 char *s = workstation_list;
 319
 320                 fstring tok;
 321
 322                 while (next_token(&s, tok, ",", sizeof(tok))) {
 323                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 324                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 325                         if(strequal(tok, user_info->wksta_name.str)) {
 326                                 invalid_ws = False;
 327                                 break;
 328                         }
 329                 }
 330
 331                 if (invalid_ws)
 332                         return NT_STATUS_INVALID_WORKSTATION;
 333         }
 334
 335         if (acct_ctrl & ACB_DOMTRUST) {
 336                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 337                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 338         }
 339
 340         if (acct_ctrl & ACB_SVRTRUST) {
 341                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 342                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 343         }
 344
 345         if (acct_ctrl & ACB_WSTRUST) {
 346                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 347                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 348         }
 349
 350         return NT_STATUS_OK;
 351 }
 352
 353
 354 /****************************************************************************
 355 check if a username/password is OK assuming the password is a 24 byte
 356 SMB hash supplied in the user_info structure
 357 return an NT_STATUS constant.
 358 ****************************************************************************/
 359
 360 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 361                                    void *my_private_data,
 362                                    TALLOC_CTX *mem_ctx,
 363                                    const auth_usersupplied_info *user_info,
 364                                    auth_serversupplied_info **server_info)
 365 {
 366         SAM_ACCOUNT *sampass=NULL;
 367         BOOL ret;
 368         NTSTATUS nt_status;
 369         uint8 user_sess_key[16];
 370         const uint8* lm_hash;
 371
 372         if (!user_info || !auth_context) {
 373                 return NT_STATUS_UNSUCCESSFUL;
 374         }
 375
 376         /* Can't use the talloc version here, becouse the returned struct gets
 377            kept on the server_info */
 378         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 379                 return nt_status;
 380         }
 381
 382         /* get the account information */
 383
 384         become_root();
 385         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 386         unbecome_root();
 387
 388         if (ret == False)
 389         {
 390                 DEBUG(3,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 391                 pdb_free_sam(&sampass);
 392                 return NT_STATUS_NO_SUCH_USER;
 393         }
 394
 395         nt_status = sam_password_ok(auth_context, mem_ctx, sampass, user_info, user_sess_key);
 396
 397         if (!NT_STATUS_IS_OK(nt_status)) {
 398                 pdb_free_sam(&sampass);
 399                 return nt_status;
 400         }
 401
 402         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 403
 404         if (!NT_STATUS_IS_OK(nt_status)) {
 405                 pdb_free_sam(&sampass);
 406                 return nt_status;
 407         }
 408
 409         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 410                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 411                 return nt_status;
 412         }
 413
 414         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 415         if (lm_hash) {
 416                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 417         }
 418
 419         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 420
 421         return nt_status;
 422 }
 423
 424 /* module initialisation */
 425 NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 426 {
 427         if (!make_auth_methods(auth_context, auth_method)) {
 428                 return NT_STATUS_NO_MEMORY;
 429         }
 430
 431         (*auth_method)->auth = check_sam_security;
 432         (*auth_method)->name = "sam";
 433         return NT_STATUS_OK;
 434 }
 435
 436
 437 /****************************************************************************
 438 Check SAM security (above) but with a few extra checks.
 439 ****************************************************************************/
 440
 441 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 442                                          void *my_private_data,
 443                                          TALLOC_CTX *mem_ctx,
 444                                          const auth_usersupplied_info *user_info,
 445                                          auth_serversupplied_info **server_info)
 446 {
 447
 448         if (!user_info || !auth_context) {
 449                 return NT_STATUS_LOGON_FAILURE;
 450         }
 451
 452         /* If we are a domain member, we must not
 453            attempt to check the password locally,
 454            unless it is one of our aliases. */
 455
 456         if (!is_netbios_alias_or_name(user_info->domain.str)) {
 457                 return NT_STATUS_NO_SUCH_USER;
 458         }
 459
 460         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 461 }
 462
 463 /* module initialisation */
 464 NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 465 {
 466         if (!make_auth_methods(auth_context, auth_method)) {
 467                 return NT_STATUS_NO_MEMORY;
 468         }
 469
 470         (*auth_method)->auth = check_samstrict_security;
 471         (*auth_method)->name = "samstrict";
 472         return NT_STATUS_OK;
 473 }
 474
 475