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/*
Unix SMB/Netbios implementation.
Version 1.9.
SMB parameters and setup
Copyright (C) Andrew Tridgell 1992-1998
Modified by Jeremy Allison 1995.
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.
*/
#define DEBUG(a,b) ;
extern int DEBUGLEVEL;
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "smbbyteorder.h"
#include "smbdes.h"
#include "smbencrypt.h"
#include "smbmd4.h"
typedef int BOOL;
#define False 0
#define True 1
/****************************************************************************
Like strncpy but always null terminates. Make sure there is room!
The variable n should always be one less than the available size.
****************************************************************************/
static char *StrnCpy(char *dest,const char *src, size_t n)
{
char *d = dest;
if (!dest) return(NULL);
if (!src) {
*dest = 0;
return(dest);
}
while (n-- && (*d++ = *src++)) ;
*d = 0;
return(dest);
}
static size_t skip_multibyte_char(char c)
{
(void)c;
return 0;
}
static void strupper(char *s)
{
while (*s)
{
{
size_t skip = skip_multibyte_char( *s );
if( skip != 0 )
s += skip;
else
{
if (islower((unsigned char)*s))
*s = toupper((unsigned char)*s);
s++;
}
}
}
}
extern void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8, unsigned char p24[24]);
/*
This implements the X/Open SMB password encryption
It takes a password, a 8 byte "crypt key" and puts 24 bytes of
encrypted password into p24
*/
void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
{
unsigned char p14[15], p21[21];
memset(p21,'\0',21);
memset(p14,'\0',14);
StrnCpy((char *)p14,(char *)passwd,14);
strupper((char *)p14);
E_P16(p14, p21);
SMBOWFencrypt(p21, c8, p24);
#ifdef DEBUG_PASSWORD
DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
dump_data(100, (char *)p21, 16);
dump_data(100, (char *)c8, 8);
dump_data(100, (char *)p24, 24);
#endif
}
/* Routines for Windows NT MD4 Hash functions. */
static int _my_wcslen(int16_t *str)
{
int len = 0;
while(*str++ != 0)
len++;
return len;
}
/*
* Convert a string into an NT UNICODE string.
* Note that regardless of processor type
* this must be in intel (little-endian)
* format.
*/
static int _my_mbstowcs(int16_t *dst, unsigned char *src, int len)
{
int i;
int16_t val;
for(i = 0; i < len; i++) {
val = *src;
SSVAL(dst,0,val);
dst++;
src++;
if(val == 0)
break;
}
return i;
}
/*
* Creates the MD4 Hash of the users password in NT UNICODE.
*/
static void E_md4hash(unsigned char *passwd, unsigned char *p16)
{
int len;
int16_t wpwd[129];
/* Password cannot be longer than 128 characters */
len = strlen((char *)passwd);
if(len > 128)
len = 128;
/* Password must be converted to NT unicode */
_my_mbstowcs(wpwd, passwd, len);
wpwd[len] = 0; /* Ensure string is null terminated */
/* Calculate length in bytes */
len = _my_wcslen(wpwd) * sizeof(int16_t);
mdfour(p16, (unsigned char *)wpwd, len);
}
/* Does the des encryption from the NT or LM MD4 hash. */
void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8, unsigned char p24[24])
{
unsigned char p21[21];
memset(p21,'\0',21);
memcpy(p21, passwd, 16);
E_P24(p21, c8, p24);
}
/* Does the NT MD4 hash then des encryption. */
void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
{
unsigned char p21[21];
memset(p21,'\0',21);
E_md4hash(passwd, p21);
SMBOWFencrypt(p21, c8, p24);
#ifdef DEBUG_PASSWORD
DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
dump_data(100, (char *)p21, 16);
dump_data(100, (char *)c8, 8);
dump_data(100, (char *)p24, 24);
#endif
}
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