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/*
Unix SMB/Netbios implementation.
Version 1.9.
code to manipulate domain credentials
Copyright (C) Andrew Tridgell 1997
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;
/****************************************************************************
setup the session key.
Input: 8 byte challenge block
8 byte server challenge block
16 byte md4 encrypted password
Output:
8 byte session key
****************************************************************************/
void cred_session_key(DOM_CHAL *clnt_chal, DOM_CHAL *srv_chal, char *pass,
uint32 session_key[2])
{
uint32 sum[2];
char sum2[8];
char buf[8];
char netsesskey[8];
sum[0] = IVAL(clnt_chal->data, 0) + IVAL(srv_chal->data, 0);
sum[1] = IVAL(clnt_chal->data, 4) + IVAL(srv_chal->data, 4);
SIVAL(sum2,0,sum[0]);
SIVAL(sum2,4,sum[1]);
smbhash(buf, sum2, pass);
smbhash(netsesskey, buf, pass+9);
session_key[0] = IVAL(netsesskey, 0);
session_key[1] = IVAL(netsesskey, 4);
/* debug output */
DEBUG(4,("cred_session_key\n"));
DEBUG(5,(" clnt_chal: %lx %lx\n", clnt_chal->data[0], clnt_chal->data[1]));
DEBUG(5,(" srv_chal : %lx %lx\n", srv_chal ->data[0], srv_chal ->data[1]));
DEBUG(5,(" clnt+srv : %lx %lx\n", sum [0], sum [1]));
DEBUG(5,(" sess_key : %lx %lx\n", session_key [0], session_key [1]));
}
/****************************************************************************
create a credential
Input:
8 byte sesssion key
8 byte stored credential
4 byte timestamp
Output:
8 byte credential
****************************************************************************/
void cred_create(uint32 session_key[2], DOM_CHAL *stor_cred, UTIME timestamp,
DOM_CHAL *cred)
{
char key2[7];
char buf[8];
char calc_cred[8];
char timecred[8];
char netsesskey[8];
SIVAL(netsesskey, 0, session_key[0]);
SIVAL(netsesskey, 4, session_key[1]);
SIVAL(timecred, 0, IVAL(stor_cred, 0) + timestamp.time);
SIVAL(timecred, 4, IVAL(stor_cred, 4));
smbhash(buf, timecred, netsesskey);
memset(key2, 0, 7);
key2[0] = netsesskey[7];
smbhash(calc_cred, buf, key2);
cred->data[0] = IVAL(calc_cred, 0);
cred->data[1] = IVAL(calc_cred, 4);
/* debug output*/
DEBUG(4,("cred_create\n"));
DEBUG(5,(" sess_key : %lx %lx\n", session_key [0], session_key [1]));
DEBUG(5,(" stor_cred: %lx %lx\n", stor_cred->data[0], stor_cred->data[1]));
DEBUG(5,(" timecred : %lx %lx\n", IVAL(timecred, 0) , IVAL(timecred, 4) ));
DEBUG(5,(" calc_cred: %lx %lx\n", cred ->data[0], cred ->data[1]));
}
/****************************************************************************
check a supplied credential
Input:
8 byte received credential
8 byte sesssion key
8 byte stored credential
4 byte timestamp
Output:
returns 1 if computed credential matches received credential
returns 0 otherwise
****************************************************************************/
int cred_assert(DOM_CHAL *cred, uint32 session_key[2], DOM_CHAL *stored_cred,
UTIME timestamp)
{
DOM_CHAL cred2;
cred_create(session_key, stored_cred, timestamp, &cred2);
/* debug output*/
DEBUG(4,("cred_assert\n"));
DEBUG(5,(" challenge : %lx %lx\n", cred->data[0], cred->data[1]));
DEBUG(5,(" calculated: %lx %lx\n", cred2.data[0], cred2.data[1]));
return memcmp(cred->data, cred2.data, 8) == 0;
}
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