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/*
* Authentication module for the Micr$oft NTLM mechanism.
*
* This file is part of libESMTP, a library for submission of RFC 2822
* formatted electronic mail messages using the SMTP protocol described
* in RFC 2821.
*
* Copyright (C) 2002 Brian Stafford <brian@stafford.uklinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <openssl/des.h>
#include <openssl/md4.h>
#include "ntlm.h"
static void
lm_deshash (void *result, const_des_cblock *iv, const void *secret)
{
des_cblock key;
des_key_schedule ks;
unsigned char key_56[8];
size_t len;
/* copy and pad the secret */
len = strlen (secret);
if (len > sizeof key_56)
len = sizeof key_56;
memcpy (key_56, secret, len);
if (sizeof key_56 - len > 0)
memset (key_56 + len, 0, sizeof key_56 - len);
/* convert 56 bit key to the 64 bit */
key[0] = key_56[0];
key[1] = (key_56[0] << 7) | (key_56[1] >> 1);
key[2] = (key_56[1] << 6) | (key_56[2] >> 2);
key[3] = (key_56[2] << 5) | (key_56[3] >> 3);
key[4] = (key_56[3] << 4) | (key_56[4] >> 4);
key[5] = (key_56[4] << 3) | (key_56[5] >> 5);
key[6] = (key_56[5] << 2) | (key_56[6] >> 6);
key[7] = (key_56[6] << 1);
des_set_odd_parity (&key);
des_set_key (&key, ks);
des_ecb_encrypt (iv, result, ks, DES_ENCRYPT);
/* paranoia */
memset (key, 0, sizeof key);
memset (&ks, 0, sizeof ks);
}
/* Copy and convert to upper case. If supplied string is shorter than the
destination, zero pad the remainder. */
char *
lm_uccpy (char *dst, size_t dstlen, const char *src)
{
char *p;
size_t len;
if ((len = strlen (src)) > dstlen)
len = dstlen;
for (p = dst; len > 0; p++, src++, len--)
*p = toupper (*src);
if (p < dst + dstlen)
memset (p, 0, dst + dstlen - p);
return dst;
}
/* create LanManager hashed password */
void
lm_hash_password (unsigned char *hash, const char *pass)
{
static const_des_cblock iv = { 0x4B, 0x47, 0x53, 0x21,
0x40, 0x23, 0x24, 0x25 };
char lmpass[14];
lm_uccpy (lmpass, sizeof lmpass, pass);
lm_deshash (hash, &iv, lmpass);
lm_deshash (hash + 8, &iv, lmpass + 7);
memset (lmpass, 0, sizeof lmpass);
}
/* convert to unicode */
unsigned char *
nt_unicode (const char *string, size_t len)
{
unsigned char *uni, *pp;
uni = malloc (len * 2);
if ((pp = uni) != NULL)
while (len-- > 0)
{
*pp++ = (unsigned char) *string++;
*pp++ = 0;
}
return uni;
}
void
nt_hash_password (unsigned char *hash, const char *pass)
{
int len;
unsigned char *nt_pw;
MD4_CTX context;
len = strlen (pass);
if ((nt_pw = nt_unicode (pass, len)) == NULL)
return;
MD4_Init (&context);
MD4_Update (&context, nt_pw, 2 * len);
MD4_Final (hash, &context);
memset (&context, 0, sizeof context);
memset (nt_pw, 0, 2 * len);
free (nt_pw);
}
/* Use the server's 8 octet nonce and the secret to create the 24 octet
LanManager and NT responses. */
void
ntlm_responses (unsigned char *lm_resp, unsigned char *nt_resp,
const unsigned char *challenge, const char *secret)
{
unsigned char hash[21];
des_cblock nonce;
memcpy (&nonce, challenge, sizeof nonce);
lm_hash_password (hash, secret);
memset (hash + 16, 0, 5);
lm_deshash (lm_resp, &nonce, hash);
lm_deshash (lm_resp + 8, &nonce, hash + 7);
lm_deshash (lm_resp + 16, &nonce, hash + 14);
nt_hash_password (hash, secret);
memset (hash + 16, 0, 5);
lm_deshash (nt_resp, &nonce, hash);
lm_deshash (nt_resp + 8, &nonce, hash + 7);
lm_deshash (nt_resp + 16, &nonce, hash + 14);
memset (hash, 0, sizeof hash);
}
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