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(SAM_ACCOUNT *sampass,
 136                                 const auth_usersupplied_info *user_info,
 137                                 const auth_authsupplied_info *auth_info,
 138                                 uint8 user_sess_key[16])
 139 {
 140         uint16 acct_ctrl;
 141         const uint8 *nt_pw, *lm_pw;
 142         uint32 ntlmssp_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         ntlmssp_flags = user_info->ntlmssp_flags;
 163
 164         if (nt_pw == NULL) {
 165                 DEBUG(3,("smb_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                 ntlmssp_flags &= (~(NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_NTLM2));
 169         }
 170
 171         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 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,("smb_password_ok: Checking NTLMv2 password\n"));
 176                 if (smb_pwd_check_ntlmv2( user_info->nt_resp,
 177                                           nt_pw, auth_info->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,("smb_password_ok: NTLMv2 password check failed\n"));
 185                         return NT_STATUS_WRONG_PASSWORD;
 186                 }
 187         } else if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM) {
 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,("smb_password_ok: Checking NT MD4 password\n"));
 193                         if (smb_pwd_check_ntlmv1(user_info->nt_resp,
 194                                                  nt_pw, auth_info->challenge,
 195                                                  user_sess_key))
 196                         {
 197                                 return NT_STATUS_OK;
 198                         } else {
 199                                 DEBUG(3,("smb_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,("smb_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,("smb_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 210                 ntlmssp_flags &= (~NTLMSSP_NEGOTIATE_OEM);
 211         }
 212
 213         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_OEM) {
 214
 215                 if (user_info->lm_resp.length != 24) {
 216                         DEBUG(2,("smb_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,("smb_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,("smb_password_ok: Checking LM password\n"));
 226                 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 227                                          lm_pw, auth_info->challenge,
 228                                          user_sess_key))
 229                 {
 230                         return NT_STATUS_OK;
 231                 } else {
 232                         DEBUG(4,("smb_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,("smb_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(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info)
 247 {
 248         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 249         char *workstation_list;
 250         time_t kickoff_time;
 251
 252         DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 253
 254         /* Quit if the account was disabled. */
 255         if (acct_ctrl & ACB_DISABLED) {
 256                 DEBUG(1,("Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 257                 return NT_STATUS_ACCOUNT_DISABLED;
 258         }
 259
 260         /* Test account expire time */
 261
 262         kickoff_time = pdb_get_kickoff_time(sampass);
 263         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 264                 DEBUG(1,("Account for user '%s' has expried.\n", pdb_get_username(sampass)));
 265                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 266                 return NT_STATUS_ACCOUNT_EXPIRED;
 267         }
 268
 269         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 270                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 271                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 272
 273                 /* check for immediate expiry "must change at next logon" */
 274                 if (must_change_time == 0 && last_set_time != 0) {
 275                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 276                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 277                 }
 278
 279                 /* check for expired password */
 280                 if (must_change_time < time(NULL) && must_change_time != 0) {
 281                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 282                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 283                         return NT_STATUS_PASSWORD_EXPIRED;
 284                 }
 285         }
 286
 287         /* Test workstation. Workstation list is comma separated. */
 288
 289         workstation_list = strdup(pdb_get_workstations(sampass));
 290
 291         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 292
 293         if (*workstation_list) {
 294                 BOOL invalid_ws = True;
 295                 char *s = workstation_list;
 296
 297                 fstring tok;
 298
 299                 while (next_token(&s, tok, ",", sizeof(tok))) {
 300                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 301                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 302                         if(strequal(tok, user_info->wksta_name.str)) {
 303                                 invalid_ws = False;
 304                                 break;
 305                         }
 306                 }
 307
 308                 SAFE_FREE(workstation_list);
 309                 if (invalid_ws)
 310                         return NT_STATUS_INVALID_WORKSTATION;
 311         } else {
 312                 SAFE_FREE(workstation_list);
 313         }
 314
 315         if (acct_ctrl & ACB_DOMTRUST) {
 316                 DEBUG(2,("session_trust_account: 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,("session_trust_account: 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,("session_trust_account: 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 NTSTATUS check_sam_security(void *my_private_dat,
 341                             const auth_usersupplied_info *user_info,
 342                             const auth_authsupplied_info *auth_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_info) {
 352                 return NT_STATUS_LOGON_FAILURE;
 353         }
 354
 355         if (!pdb_init_sam(&sampass)) {
 356                 return NT_STATUS_NO_MEMORY;
 357         }
 358
 359         /* get the account information */
 360
 361         become_root();
 362         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 363         unbecome_root();
 364
 365         if (ret == False)
 366         {
 367                 DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 368                 pdb_free_sam(&sampass);
 369                 return NT_STATUS_NO_SUCH_USER;
 370         }
 371
 372         nt_status = sam_password_ok(sampass, user_info, auth_info, user_sess_key);
 373
 374         if (!NT_STATUS_IS_OK(nt_status)) {
 375                 pdb_free_sam(&sampass);
 376                 return nt_status;
 377         }
 378
 379         nt_status = sam_account_ok(sampass, user_info);
 380
 381         if (!NT_STATUS_IS_OK(nt_status)) {
 382                 pdb_free_sam(&sampass);
 383                 return nt_status;
 384         }
 385
 386         if (!make_server_info_sam(server_info, sampass)) {
 387                 DEBUG(0,("failed to malloc memory for server_info\n"));
 388                 return NT_STATUS_NO_MEMORY;
 389         }
 390
 391         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 392         if (lm_hash) {
 393                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 394         }
 395
 396         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 397
 398         return nt_status;
 399 }
 400
 401 BOOL auth_init_sam(auth_methods **auth_method)
 402 {
 403         if (!make_auth_methods(auth_method)) {
 404                 return False;
 405         }
 406
 407         (*auth_method)->auth = check_sam_security;
 408         return True;
 409 }
 410
 411
 412