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/*
Unix SMB/CIFS implementation.
a partial implementation of DES designed for use in the
SMB authentication protocol
Copyright (C) Andrew Tridgell 1998
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libcli/auth/libcli_auth.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
static void str_to_key(const uint8_t *str,uint8_t *key)
{
int i;
key[0] = str[0]>>1;
key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
key[7] = str[6]&0x7F;
for (i=0;i<8;i++) {
key[i] = (key[i]<<1);
}
}
int des_crypt56_gnutls(uint8_t out[8], const uint8_t in[8],
const uint8_t key_in[7],
enum samba_gnutls_direction encrypt)
{
/*
* A single block DES-CBC op, with an all-zero IV is the same as DES
* because the IV is combined with the data using XOR.
* This allows us to use GNUTLS_CIPHER_DES_CBC from GnuTLS and not
* implement single-DES in Samba.
*
* In turn this is used to build DES-ECB, which is used
* for example in the NTLM challenge/response calculation.
*/
static const uint8_t iv8[8];
gnutls_datum_t iv = { discard_const(iv8), 8 };
gnutls_datum_t key;
gnutls_cipher_hd_t ctx;
uint8_t key2[8];
uint8_t outb[8];
int ret;
memset(out, 0, 8);
str_to_key(key_in, key2);
key.data = key2;
key.size = 8;
ret = gnutls_global_init();
if (ret != 0) {
return ret;
}
ret = gnutls_cipher_init(&ctx, GNUTLS_CIPHER_DES_CBC, &key, &iv);
if (ret != 0) {
return ret;
}
memcpy(outb, in, 8);
if (encrypt == SAMBA_GNUTLS_ENCRYPT) {
ret = gnutls_cipher_encrypt(ctx, outb, 8);
} else {
ret = gnutls_cipher_decrypt(ctx, outb, 8);
}
if (ret == 0) {
memcpy(out, outb, 8);
}
gnutls_cipher_deinit(ctx);
return ret;
}
int E_P16(const uint8_t *p14,uint8_t *p16)
{
const uint8_t sp8[8] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
int ret;
ret = des_crypt56_gnutls(p16, sp8, p14, SAMBA_GNUTLS_ENCRYPT);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(p16+8, sp8, p14+7, SAMBA_GNUTLS_ENCRYPT);
}
int E_P24(const uint8_t *p21, const uint8_t *c8, uint8_t *p24)
{
int ret;
ret = des_crypt56_gnutls(p24, c8, p21, SAMBA_GNUTLS_ENCRYPT);
if (ret != 0) {
return ret;
}
ret = des_crypt56_gnutls(p24+8, c8, p21+7, SAMBA_GNUTLS_ENCRYPT);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(p24+16, c8, p21+14, SAMBA_GNUTLS_ENCRYPT);
}
int E_old_pw_hash( uint8_t *p14, const uint8_t *in, uint8_t *out)
{
int ret;
ret = des_crypt56_gnutls(out, in, p14, SAMBA_GNUTLS_ENCRYPT);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(out+8, in+8, p14+7, SAMBA_GNUTLS_ENCRYPT);
}
/* des encryption with a 128 bit key */
int des_crypt128(uint8_t out[8], const uint8_t in[8], const uint8_t key[16])
{
uint8_t buf[8];
int ret;
ret = des_crypt56_gnutls(buf, in, key, SAMBA_GNUTLS_ENCRYPT);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(out, buf, key+9, SAMBA_GNUTLS_ENCRYPT);
}
/* des encryption with a 112 bit (14 byte) key */
int des_crypt112(uint8_t out[8], const uint8_t in[8], const uint8_t key[14],
enum samba_gnutls_direction encrypt)
{
uint8_t buf[8];
int ret;
if (encrypt == SAMBA_GNUTLS_ENCRYPT) {
ret = des_crypt56_gnutls(buf, in, key, SAMBA_GNUTLS_ENCRYPT);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(out, buf, key+7, SAMBA_GNUTLS_ENCRYPT);
}
ret = des_crypt56_gnutls(buf, in, key+7, SAMBA_GNUTLS_DECRYPT);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(out, buf, key, SAMBA_GNUTLS_DECRYPT);
}
/* des encryption of a 16 byte lump of data with a 112 bit key */
int des_crypt112_16(uint8_t out[16], const uint8_t in[16], const uint8_t key[14],
enum samba_gnutls_direction encrypt)
{
int ret;
ret = des_crypt56_gnutls(out, in, key, encrypt);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(out + 8, in + 8, key+7, encrypt);
}
/* Decode a sam password hash into a password. The password hash is the
same method used to store passwords in the NT registry. The DES key
used is based on the RID of the user. */
int sam_rid_crypt(unsigned int rid, const uint8_t *in, uint8_t *out,
enum samba_gnutls_direction encrypt)
{
uint8_t s[14];
int ret;
s[0] = s[4] = s[8] = s[12] = (uint8_t)(rid & 0xFF);
s[1] = s[5] = s[9] = s[13] = (uint8_t)((rid >> 8) & 0xFF);
s[2] = s[6] = s[10] = (uint8_t)((rid >> 16) & 0xFF);
s[3] = s[7] = s[11] = (uint8_t)((rid >> 24) & 0xFF);
ret = des_crypt56_gnutls(out, in, s, encrypt);
if (ret != 0) {
return ret;
}
return des_crypt56_gnutls(out+8, in+8, s+7, encrypt);
}
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