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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
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 char *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 - allowing access\n"));
/* No password set - always true ! */
if (part_passwd == NULL)
return True;
SMBOWFencrypt(part_passwd, c8, p24);
if (user_sess_key != NULL)
{
SMBsesskeygen_ntv1(part_passwd, NULL, 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 char *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 - allowing access\n"));
}
/* No password set - always true ! */
if (part_passwd == NULL)
{
return True;
}
ntv2_owf_gen(part_passwd, user, domain, kr);
SMBOWFencrypt_ntv2(kr, c8, 8, password+16, pwd_len-16, 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.
****************************************************************************/
BOOL smb_password_ok(uint16 acct_ctrl,
uchar smb_passwd[16],
uchar smb_nt_passwd[16],
const uchar challenge[8],
const char *user, const char *domain,
const uchar *lm_pass, size_t lm_pwd_len,
const uchar *nt_pass, size_t nt_pwd_len,
uchar user_sess_key[16])
{
DEBUG(4,("Checking SMB password for user %s\n", user));
dump_data_pw("lm password:\n", lm_pass, lm_pwd_len);
dump_data_pw("nt password:\n", nt_pass, nt_pwd_len);
if (acct_ctrl & ACB_DISABLED)
{
DEBUG(3,("account for user %s was disabled.\n", user));
return False;
}
if (challenge == NULL)
{
DEBUG(1,("no challenge available - password failed\n"));
return False;
}
if (smb_nt_passwd != NULL)
{
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
if (lp_server_ntlmv2() != False && nt_pwd_len > 24)
{
DEBUG(4,("smb_password_ok: Check NTLMv2 password\n"));
if (smb_pwd_check_ntlmv2(nt_pass, nt_pwd_len,
(uchar *)smb_nt_passwd,
challenge, user, domain,
user_sess_key))
{
return True;
}
}
if (lp_server_ntlmv2() != True && nt_pwd_len == 24)
{
DEBUG(4,("smb_password_ok: Check NT MD4 password\n"));
if (smb_pwd_check_ntlmv1((const char *)nt_pass,
(const uchar *)smb_nt_passwd,
challenge,
user_sess_key))
{
DEBUG(4,("NT MD4 password check succeeded\n"));
return True;
}
}
DEBUG(4,("NT MD4 password check failed\n"));
}
if (lp_server_ntlmv2() == True)
{
DEBUG(4,("Not checking LM MD4 password\n"));
return False;
}
/* Try against the lanman password. smb_passwd == NULL means
no password, allow access. */
DEBUG(4,("Checking LM MD4 password\n"));
if ((smb_passwd == NULL) &&
(acct_ctrl & ACB_PWNOTREQ))
{
DEBUG(4,("no password required for user %s\n", user));
return True;
}
if ((smb_passwd != NULL) &&
smb_pwd_check_ntlmv1((const char *)lm_pass,
(const uchar *)smb_passwd,
challenge, user_sess_key))
{
DEBUG(4,("LM MD4 password check succeeded\n"));
return(True);
}
DEBUG(4,("LM MD4 password check failed\n"));
return False;
}
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