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/*
* Stonith module for Dell DRACIII (Dell Remote Access Card)
*
* Copyright (C) 2003 Alfa21 Outsourcing
* Copyright (C) 2003 Roberto Moreda <moreda@alfa21.com>
*
* 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 <lha_internal.h>
#include <string.h>
#include <stdio.h>
#include <clplumbing/base64.h>
#include <clplumbing/md5.h>
#include <glib.h>
#include "drac3_hash.h"
#define BUFLEN 1024 /* buffer */
#define SBUFLEN 256 /* small buffer */
#define MD5LEN 16 /* md5 buffer */
/* Hash functions for DRAC3 authentication */
guint16
drac3Crc16(const char *str,
const int l) {
int i,j;
guint16 crc = 0;
for (i=0; i<l; i++) {
crc = crc ^ (str[i] << 8);
for (j=0; j<8; j++)
crc = ( (crc & 0x8000) == 32768 ? (crc<<1) ^ 0x1021 : crc<<1);
}
crc = crc & 0xFFFF;
return crc;
}
void
drac3AuthHash(const char * chall,
const char * pass,
char * token,
int len) {
char * chall_dup;
char challBytes[MD5LEN];
char passMD5[MD5LEN];
char xorBytes[MD5LEN];
char xorBytesMD5[MD5LEN];
guint16 crc;
char response[MD5LEN+2];
char responseb64[SBUFLEN];
int i;
/* decodes chall -> challBytes */
memset(challBytes, 0, MD5LEN);
chall_dup = g_strdup(chall);
if (chall_dup[strlen(chall_dup) - 1] == '\n' ) {
chall_dup[strlen(chall_dup) - 1] = '\0';
}
base64_to_binary(chall_dup, strlen(chall_dup), challBytes, MD5LEN);
/* gets MD5 from pass -> passMD5 */
MD5((const unsigned char *)pass, strlen(pass), (unsigned char *)passMD5);
/* calculate challBytes and passMD5 xor -> xorBytes */
for (i=0; i<MD5LEN; i++) {
xorBytes[i] = challBytes[i] ^ passMD5[i];
}
/* calculate xorBytes MD5 -> xorBytesMD5 */
MD5((unsigned char *)xorBytes, MD5LEN, (unsigned char *)xorBytesMD5);
/* calculate xorBytesMD5 crc16 */
crc = drac3Crc16(xorBytesMD5, MD5LEN);
/* joins xorBytesMD5 and crc16 -> response */
memcpy(response, xorBytesMD5, MD5LEN);
memcpy(response+MD5LEN, &crc, 2);
/* calculate response base64 -> responseb64 */
memset(responseb64, 0, SBUFLEN);
binary_to_base64(response, MD5LEN+2, responseb64, SBUFLEN);
/* assuring null-termination */
responseb64[SBUFLEN-1]=0x00;
snprintf(token, len, "%s", responseb64);
token[len-1]=0x00;
}
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