source/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(const uchar *password,
  30                                 const uchar *part_passwd,
  31                                 const uchar *c8,
  32                                 char 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   SMBOWFencrypt(part_passwd, c8, p24);
  44         if (user_sess_key != NULL)
  45         {
  46                 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key);
  47         }
  48
  49
  50
  51 #if DEBUG_PASSWORD
  52         DEBUG(100,("Part password (P16) was |"));
  53         dump_data(100, part_passwd, 16);
  54         DEBUG(100,("Password from client was |"));
  55         dump_data(100, password, 24);
  56         DEBUG(100,("Given challenge was |"));
  57         dump_data(100, c8, 8);
  58         DEBUG(100,("Value from encryption was |"));
  59         dump_data(100, p24, 24);
  60 #endif
  61   return (memcmp(p24, password, 24) == 0);
  62 }
  63
  64 /****************************************************************************
  65 core of smb password checking routine.
  66 ****************************************************************************/
  67 static BOOL smb_pwd_check_ntlmv2(const uchar *password, size_t pwd_len,
  68                                 uchar *part_passwd,
  69                                 uchar const *c8,
  70                                 const char *user, const char *domain,
  71                                 char user_sess_key[16])
  72 {
  73         /* Finish the encryption of part_passwd. */
  74         uchar kr[16];
  75         uchar resp[16];
  76
  77         if (part_passwd == NULL)
  78         {
  79                 DEBUG(10,("No password set - DISALLOWING access\n"));
  80                 /* No password set - always False */
  81                 return False;
  82         }
  83
  84         ntv2_owf_gen(part_passwd, user, domain, kr);
  85         SMBOWFencrypt_ntv2(kr, c8, 8, password+16, pwd_len-16, (char *)resp);
  86         if (user_sess_key != NULL)
  87         {
  88                 SMBsesskeygen_ntv2(kr, resp, user_sess_key);
  89         }
  90
  91 #if DEBUG_PASSWORD
  92         DEBUG(100,("Part password (P16) was |"));
  93         dump_data(100, part_passwd, 16);
  94         DEBUG(100,("Password from client was |"));
  95         dump_data(100, password, pwd_len);
  96         DEBUG(100,("Given challenge was |"));
  97         dump_data(100, c8, 8);
  98         DEBUG(100,("Value from encryption was |"));
  99         dump_data(100, resp, 16);
 100 #endif
 101
 102         return (memcmp(resp, password, 16) == 0);
 103 }
 104
 105
 106 /****************************************************************************
 107  Do a specific test for an smb password being correct, given a smb_password and
 108  the lanman and NT responses.
 109 ****************************************************************************/
 110 NTSTATUS sam_password_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info, char user_sess_key[16])
 111 {
 112         uint8 *nt_pw, *lm_pw;
 113         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 114
 115         if (!user_info || !sampass)
 116                 return NT_STATUS_LOGON_FAILURE;
 117
 118         if (acct_ctrl & ACB_PWNOTREQ)
 119         {
 120                 if (lp_null_passwords())
 121                 {
 122                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", sampass->username));
 123                         return(NT_STATUS_OK);
 124                 }
 125                 else
 126                 {
 127                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", sampass->username));
 128                         return(NT_STATUS_LOGON_FAILURE);
 129                 }
 130         }
 131
 132         nt_pw = pdb_get_nt_passwd(sampass);
 133         lm_pw = pdb_get_lanman_passwd(sampass);
 134
 135         if (nt_pw != NULL && user_info->nt_resp.len > 0) {
 136                 if ((user_info->nt_resp.len > 24 )) {
 137                         /* We have the NT MD4 hash challenge available - see if we can
 138                            use it (ie. does it exist in the smbpasswd file).
 139                         */
 140                         DEBUG(4,("smb_password_ok: Checking NTLMv2 password\n"));
 141                         if (smb_pwd_check_ntlmv2( user_info->nt_resp.buffer,
 142                                                   user_info->nt_resp.len,
 143                                                   nt_pw,
 144                                                   user_info->chal, user_info->smb_username.str,
 145                                                   user_info->requested_domain.str,
 146                                                   user_sess_key))
 147                         {
 148                                 return NT_STATUS_OK;
 149                         } else {
 150                                 DEBUG(4,("smb_password_ok: NTLMv2 password check failed\n"));
 151                                         return NT_STATUS_WRONG_PASSWORD;
 152                         }
 153
 154                 } else if (lp_ntlm_auth() && (user_info->nt_resp.len == 24)) {
 155                                 /* We have the NT MD4 hash challenge available - see if we can
 156                                    use it (ie. does it exist in the smbpasswd file).
 157                                 */
 158                         DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
 159                         if (smb_pwd_check_ntlmv1(user_info->nt_resp.buffer,
 160                                                  nt_pw, user_info->chal,
 161                                                  user_sess_key))
 162                         {
 163                                 return NT_STATUS_OK;
 164                         } else {
 165                                 DEBUG(4,("smb_password_ok: NT MD4 password check failed\n"));
 166                                 return NT_STATUS_WRONG_PASSWORD;
 167                         }
 168                 } else {
 169                         return NT_STATUS_LOGON_FAILURE;
 170                 }
 171         }
 172
 173         if (lm_pw != NULL && user_info->lm_resp.len == 24) {
 174                 if (lp_lanman_auth()) {
 175                         DEBUG(4,("smb_password_ok: Checking LM password\n"));
 176                         if (smb_pwd_check_ntlmv1(user_info->lm_resp.buffer,
 177                                                  lm_pw, user_info->chal,
 178                                                  user_sess_key))
 179                         {
 180                                 return NT_STATUS_OK;
 181                         } else {
 182                                 DEBUG(4,("smb_password_ok: LM password check failed\n"));
 183                                 return NT_STATUS_WRONG_PASSWORD;
 184                         }
 185                 }
 186         }
 187
 188         /* Should not be reached */
 189         return NT_STATUS_LOGON_FAILURE;
 190 }
 191
 192 /****************************************************************************
 193  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 194  (ie not disabled, expired and the like).
 195 ****************************************************************************/
 196 NTSTATUS sam_account_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info)
 197 {
 198         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 199         char *workstation_list;
 200         time_t kickoff_time;
 201
 202         if (!user_info || !sampass)
 203                 return NT_STATUS_LOGON_FAILURE;
 204
 205         DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",sampass->username));
 206
 207         /* Quit if the account was disabled. */
 208         if (acct_ctrl & ACB_DISABLED) {
 209                 DEBUG(1,("Account for user '%s' was disabled.\n", sampass->username));
 210                 return NT_STATUS_ACCOUNT_DISABLED;
 211         }
 212
 213         /* Test account expire time */
 214
 215         kickoff_time = pdb_get_kickoff_time(sampass);
 216         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 217                 DEBUG(1,("Account for user '%s' has expried.\n", sampass->username));
 218                 DEBUG(3,("Account expired at '%ld' unix time.\n", (long)kickoff_time));
 219                 return NT_STATUS_ACCOUNT_EXPIRED;
 220         }
 221
 222         /* Test workstation. Workstation list is comma separated. */
 223
 224         workstation_list = strdup(pdb_get_workstations(sampass));
 225
 226         if (!workstation_list) return NT_STATUS_NO_MEMORY;
 227
 228         if (*workstation_list) {
 229                 BOOL invalid_ws = True;
 230                 char *s = workstation_list;
 231
 232                 fstring tok;
 233
 234                 while (next_token(&s, tok, ",", sizeof(tok))) {
 235                         DEBUG(10,("checking for workstation match %s and %s (len=%d)\n",
 236                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 237                         if(strequal(tok, user_info->wksta_name.str)) {
 238                                 invalid_ws = False;
 239                                 break;
 240                         }
 241                 }
 242
 243                 SAFE_FREE(workstation_list);
 244                 if (invalid_ws)
 245                         return NT_STATUS_INVALID_WORKSTATION;
 246         } else {
 247                 SAFE_FREE(workstation_list);
 248         }
 249
 250         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 251                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 252                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 253
 254                 /* check for immediate expiry "must change at next logon" */
 255                 if (must_change_time == 0 && last_set_time != 0) {
 256                         DEBUG(1,("Account for user '%s' password must change!.\n", sampass->username));
 257                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 258                 }
 259
 260                 /* check for expired password */
 261                 if (must_change_time < time(NULL) && must_change_time != 0) {
 262                         DEBUG(1,("Account for user '%s' password expired!.\n", sampass->username));
 263                         DEBUG(1,("Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 264                         return NT_STATUS_PASSWORD_EXPIRED;
 265                 }
 266         }
 267
 268         if (acct_ctrl & ACB_DOMTRUST) {
 269                 DEBUG(2,("session_trust_account: Domain trust account %s denied by server\n", sampass->username));
 270                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 271         }
 272
 273         if (acct_ctrl & ACB_SVRTRUST) {
 274                 DEBUG(2,("session_trust_account: Server trust account %s denied by server\n", sampass->username));
 275                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 276         }
 277
 278         if (acct_ctrl & ACB_WSTRUST) {
 279                 DEBUG(4,("session_trust_account: Wksta trust account %s denied by server\n", sampass->username));
 280                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 281         }
 282
 283         return NT_STATUS_OK;
 284 }
 285
 286
 287 /****************************************************************************
 288 check if a username/password is OK assuming the password is a 24 byte
 289 SMB hash supplied in the user_info structure
 290 return an NT_STATUS constant.
 291 ****************************************************************************/
 292
 293 NTSTATUS check_smbpasswd_security(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info)
 294 {
 295         SAM_ACCOUNT *sampass=NULL;
 296         BOOL ret;
 297         NTSTATUS nt_status;
 298
 299         pdb_init_sam(&sampass);
 300
 301         /* get the account information */
 302
 303         become_root();
 304         ret = pdb_getsampwnam(sampass, user_info->unix_username.str);
 305         unbecome_root();
 306
 307         if (ret == False)
 308         {
 309                 DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->unix_username.str));
 310                 pdb_free_sam(&sampass);
 311                 return NT_STATUS_NO_SUCH_USER;
 312         }
 313
 314         nt_status = sam_password_ok(sampass, user_info, server_info->session_key);
 315
 316         if NT_STATUS_IS_OK(nt_status) {
 317                 nt_status = sam_account_ok(sampass, user_info);
 318         }
 319
 320         pdb_free_sam(&sampass);
 321         return nt_status;
 322 }