source3/smbd/auth_smbpasswd.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 challange 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_ntlmv1: 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 NTSTATUS sam_password_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info, uint8 user_sess_key[16])
 136 {
 137         const uint8 *nt_pw, *lm_pw;
 138         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 139         uint32 ntlmssp_flags;
 140
 141         if (!user_info || !sampass)
 142                 return NT_STATUS_LOGON_FAILURE;
 143
 144         if (acct_ctrl & ACB_PWNOTREQ)
 145         {
 146                 if (lp_null_passwords())
 147                 {
 148                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
 149                         return(NT_STATUS_OK);
 150                 }
 151                 else
 152                 {
 153                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
 154                         return(NT_STATUS_LOGON_FAILURE);
 155                 }
 156         }
 157
 158         nt_pw = pdb_get_nt_passwd(sampass);
 159         lm_pw = pdb_get_lanman_passwd(sampass);
 160
 161         ntlmssp_flags = user_info->ntlmssp_flags;
 162
 163         if (nt_pw == NULL) {
 164                 DEBUG(3,("smb_password_ok: NO NT password stored for user %s.\n",
 165                          pdb_get_username(sampass)));
 166                 /* No return, we want to check the LM hash below in this case */
 167                 ntlmssp_flags &= (~(NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_NTLM2));
 168         }
 169
 170         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 171                         /* We have the NT MD4 hash challenge available - see if we can
 172                            use it (ie. does it exist in the smbpasswd file).
 173                         */
 174                         DEBUG(4,("smb_password_ok: Checking NTLMv2 password\n"));
 175                         if (smb_pwd_check_ntlmv2( user_info->nt_resp,
 176                                                   nt_pw,
 177                                                   user_info->sec_blob, user_info->smb_name.str,
 178                                                   user_info->client_domain.str,
 179                                                   user_sess_key))
 180                         {
 181                                 return NT_STATUS_OK;
 182                         } else {
 183                                 DEBUG(3,("smb_password_ok: NTLMv2 password check failed\n"));
 184                                 return NT_STATUS_WRONG_PASSWORD;
 185                         }
 186         } else if (ntlmssp_flags & NTLMSSP_NEGOTIATE_NTLM) {
 187                         if (lp_ntlm_auth()) {
 188                                 /* We have the NT MD4 hash challenge available - see if we can
 189                                    use it (ie. does it exist in the smbpasswd file).
 190                                 */
 191                                 DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
 192                                 if (smb_pwd_check_ntlmv1(user_info->nt_resp,
 193                                                          nt_pw, user_info->sec_blob,
 194                                                          user_sess_key))
 195                                 {
 196                                         return NT_STATUS_OK;
 197                                 } else {
 198                                         DEBUG(3,("smb_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 199                                         return NT_STATUS_WRONG_PASSWORD;
 200                                 }
 201                         } else {
 202                                 DEBUG(2,("smb_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 203                                 /* No return, we want to check the LM hash below in this case */
 204                         }
 205         }
 206
 207         if (lm_pw == NULL) {
 208                 DEBUG(3,("smb_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 209                 ntlmssp_flags &= (~NTLMSSP_NEGOTIATE_OEM);
 210         }
 211
 212         if (ntlmssp_flags & NTLMSSP_NEGOTIATE_OEM) {
 213
 214                 if (user_info->lm_resp.length != 24) {
 215                         DEBUG(2,("smb_password_ok: invalid LanMan password length (%d) for user %s\n",
 216                                  user_info->nt_resp.length, pdb_get_username(sampass)));
 217                 }
 218
 219                 if (!lp_lanman_auth()) {
 220                         DEBUG(3,("smb_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 221                         return NT_STATUS_LOGON_FAILURE;
 222                 }
 223
 224                 DEBUG(4,("smb_password_ok: Checking LM password\n"));
 225                 if (smb_pwd_check_ntlmv1(user_info->lm_resp,
 226                                          lm_pw, user_info->sec_blob,
 227                                          user_sess_key))
 228                 {
 229                         return NT_STATUS_OK;
 230                 } else {
 231                         DEBUG(4,("smb_password_ok: LM password check failed for user %s\n",pdb_get_username(sampass)));
 232                         return NT_STATUS_WRONG_PASSWORD;
 233                 }
 234         }
 235
 236         /* Should not be reached, but if they send nothing... */
 237         DEBUG(3,("smb_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 238         return NT_STATUS_WRONG_PASSWORD;
 239 }
 240
 241 /****************************************************************************
 242  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 243  (ie not disabled, expired and the like).
 244 ****************************************************************************/
 245 NTSTATUS sam_account_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info)
 246 {
 247         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 248         char *workstation_list;
 249         time_t kickoff_time;
 250
 251         if (!user_info || !sampass)
 252                 return NT_STATUS_LOGON_FAILURE;
 253
 254         DEBUG(4,("smb_password_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         /* Test workstation. Workstation list is comma separated. */
 272
 273         workstation_list = strdup(pdb_get_workstations(sampass));
 274
 275         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 276
 277         if (*workstation_list) {
 278                 BOOL invalid_ws = True;
 279                 char *s = workstation_list;
 280
 281                 fstring tok;
 282
 283                 while (next_token(&s, tok, ",", sizeof(tok))) {
 284                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 285                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 286                         if(strequal(tok, user_info->wksta_name.str)) {
 287                                 invalid_ws = False;
 288                                 break;
 289                         }
 290                 }
 291
 292                 SAFE_FREE(workstation_list);
 293                 if (invalid_ws)
 294                         return NT_STATUS_INVALID_WORKSTATION;
 295         } else {
 296                 SAFE_FREE(workstation_list);
 297         }
 298
 299         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 300                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 301                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 302
 303                 /* check for immediate expiry "must change at next logon" */
 304                 if (must_change_time == 0 && last_set_time != 0) {
 305                         DEBUG(1,("Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 306                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 307                 }
 308
 309                 /* check for expired password */
 310                 if (must_change_time < time(NULL) && must_change_time != 0) {
 311                         DEBUG(1,("Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 312                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 313                         return NT_STATUS_PASSWORD_EXPIRED;
 314                 }
 315         }
 316
 317         if (acct_ctrl & ACB_DOMTRUST) {
 318                 DEBUG(2,("session_trust_account: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 319                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 320         }
 321
 322         if (acct_ctrl & ACB_SVRTRUST) {
 323                 DEBUG(2,("session_trust_account: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 324                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 325         }
 326
 327         if (acct_ctrl & ACB_WSTRUST) {
 328                 DEBUG(4,("session_trust_account: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 329                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 330         }
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335
 336 /****************************************************************************
 337 check if a username/password is OK assuming the password is a 24 byte
 338 SMB hash supplied in the user_info structure
 339 return an NT_STATUS constant.
 340 ****************************************************************************/
 341
 342 NTSTATUS check_smbpasswd_security(const auth_usersupplied_info *user_info, auth_serversupplied_info **server_info)
 343 {
 344         SAM_ACCOUNT *sampass=NULL;
 345         BOOL ret;
 346         NTSTATUS nt_status;
 347         uint8 user_sess_key[16];
 348         const uint8* lm_hash;
 349
 350         pdb_init_sam(&sampass);
 351
 352         /* get the account information */
 353
 354         become_root();
 355         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 356         unbecome_root();
 357
 358         if (ret == False)
 359         {
 360                 DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 361                 pdb_free_sam(&sampass);
 362                 return NT_STATUS_NO_SUCH_USER;
 363         }
 364
 365         nt_status = sam_password_ok(sampass, user_info, user_sess_key);
 366
 367         if (!NT_STATUS_IS_OK(nt_status)) {
 368                 pdb_free_sam(&sampass);
 369                 return nt_status;
 370         }
 371
 372         nt_status = sam_account_ok(sampass, user_info);
 373
 374         if (!NT_STATUS_IS_OK(nt_status)) {
 375                 pdb_free_sam(&sampass);
 376                 return nt_status;
 377         }
 378
 379         if (!make_server_info_sam(server_info, sampass)) {
 380                 DEBUG(0,("failed to malloc memory for server_info\n"));
 381                 return NT_STATUS_NO_MEMORY;
 382         }
 383
 384         lm_hash = pdb_get_lanman_passwd((*server_info)->sam_account);
 385         if (lm_hash) {
 386                 memcpy((*server_info)->first_8_lm_hash, lm_hash, 8);
 387         }
 388
 389         memcpy((*server_info)->session_key, user_sess_key, sizeof(user_sess_key));
 390
 391         return nt_status;
 392 }
 393
 394
 395
 396