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/*
Unix SMB/Netbios implementation.
Version 1.9.
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Luke Kenneth Casson Leighton 1996-2000
Copyright (C) Andrew Bartlett 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
/****************************************************************************
core of smb password checking routine.
****************************************************************************/
static BOOL smb_pwd_check_ntlmv1(const uchar *password,
const uchar *part_passwd,
const uchar *c8,
uchar user_sess_key[16])
{
/* Finish the encryption of part_passwd. */
uchar p24[24];
if (part_passwd == NULL) {
DEBUG(10,("No password set - DISALLOWING access\n"));
/* No password set - always false ! */
return False;
}
SMBOWFencrypt(part_passwd, c8, p24);
if (user_sess_key != NULL)
{
SMBsesskeygen_ntv1(part_passwd, NULL, (char *)user_sess_key);
}
#if DEBUG_PASSWORD
DEBUG(100,("Part password (P16) was |"));
dump_data(100, part_passwd, 16);
DEBUG(100,("Password from client was |"));
dump_data(100, password, 24);
DEBUG(100,("Given challenge was |"));
dump_data(100, c8, 8);
DEBUG(100,("Value from encryption was |"));
dump_data(100, p24, 24);
#endif
return (memcmp(p24, password, 24) == 0);
}
/****************************************************************************
core of smb password checking routine.
****************************************************************************/
static BOOL smb_pwd_check_ntlmv2(const uchar *password, size_t pwd_len,
uchar *part_passwd,
uchar const *c8,
const char *user, const char *domain,
char *user_sess_key)
{
/* Finish the encryption of part_passwd. */
uchar kr[16];
uchar resp[16];
if (part_passwd == NULL)
{
DEBUG(10,("No password set - DISALLOWING access\n"));
/* No password set - always False */
return False;
}
ntv2_owf_gen(part_passwd, user, domain, kr);
SMBOWFencrypt_ntv2(kr, c8, 8, password+16, pwd_len-16, (char *)resp);
if (user_sess_key != NULL)
{
SMBsesskeygen_ntv2(kr, resp, user_sess_key);
}
#if DEBUG_PASSWORD
DEBUG(100,("Part password (P16) was |"));
dump_data(100, part_passwd, 16);
DEBUG(100,("Password from client was |"));
dump_data(100, password, pwd_len);
DEBUG(100,("Given challenge was |"));
dump_data(100, c8, 8);
DEBUG(100,("Value from encryption was |"));
dump_data(100, resp, 16);
#endif
return (memcmp(resp, password, 16) == 0);
}
/****************************************************************************
Do a specific test for an smb password being correct, given a smb_password and
the lanman and NT responses.
****************************************************************************/
NTSTATUS smb_password_ok(SAM_ACCOUNT *sampass, const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info)
{
uint8 *nt_pw, *lm_pw;
uint16 acct_ctrl;
acct_ctrl = pdb_get_acct_ctrl(sampass);
/* Quit if the account was disabled. */
if(acct_ctrl & ACB_DISABLED) {
DEBUG(1,("Account for user '%s' was disabled.\n", user_info->smb_username.str));
return(NT_STATUS_ACCOUNT_DISABLED);
}
if (acct_ctrl & ACB_PWNOTREQ)
{
if (lp_null_passwords())
{
DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", user_info->smb_username.str));
return(NT_STATUS_OK);
}
else
{
DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", user_info->smb_username.str));
return(NT_STATUS_LOGON_FAILURE);
}
}
if (!user_info || !sampass)
return(NT_STATUS_LOGON_FAILURE);
DEBUG(4,("smb_password_ok: Checking SMB password for user %s\n",user_info->smb_username.str));
nt_pw = pdb_get_nt_passwd(sampass);
if (nt_pw != NULL) {
if ((user_info->nt_resp.len > 24 )) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("smb_password_ok: Checking NTLMv2 password\n"));
if (smb_pwd_check_ntlmv2( user_info->nt_resp.buffer,
user_info->nt_resp.len,
nt_pw,
user_info->chal, user_info->requested_username.str,
user_info->requested_domain.str,
(char *)server_info->session_key))
{
return NT_STATUS_OK;
}
DEBUG(4,("smb_password_ok: NTLMv2 password check failed\n"));
} else if (lp_ntlm_auth() && (user_info->nt_resp.len == 24 )) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
if (smb_pwd_check_ntlmv1(user_info->nt_resp.buffer,
nt_pw, user_info->chal,
server_info->session_key)) {
DEBUG(4,("smb_password_ok: NT MD4 password check succeeded\n"));
return NT_STATUS_OK;
} else {
DEBUG(4,("smb_password_ok: NT MD4 password check failed\n"));
return NT_STATUS_WRONG_PASSWORD;
}
}
}
lm_pw = pdb_get_lanman_passwd(sampass);
if(lp_lanman_auth() && (lm_pw != NULL) && (user_info->lm_resp.len == 24 )) {
DEBUG(4,("smb_password_ok: Checking LM password\n"));
if (smb_pwd_check_ntlmv1(user_info->lm_resp.buffer,
lm_pw, user_info->chal,
server_info->session_key)) {
DEBUG(4,("smb_password_ok: LM password check succeeded\n"));
return NT_STATUS_OK;
} else {
DEBUG(4,("smb_password_ok: LM password check failed\n"));
return NT_STATUS_WRONG_PASSWORD;
}
}
return NT_STATUS_LOGON_FAILURE;
}
/****************************************************************************
check if a username/password is OK assuming the password is a 24 byte
SMB hash supplied in the user_info structure
return an NT_STATUS constant.
****************************************************************************/
NTSTATUS check_smbpasswd_security(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info)
{
SAM_ACCOUNT *sampass=NULL;
BOOL ret;
NTSTATUS nt_status;
pdb_init_sam(&sampass);
/* get the account information */
become_root();
ret = pdb_getsampwnam(sampass, user_info->smb_username.str);
unbecome_root();
if (ret == False)
{
DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user_info->smb_username.str));
pdb_free_sam(sampass);
return NT_STATUS_NO_SUCH_USER;
}
nt_status = smb_password_ok(sampass, user_info, server_info);
pdb_free_sam(sampass);
return nt_status;
}
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