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/***************************************************************************
* Copyright (C) 2005 by hal9000 <hal9000@evilscientists.de> *
* Copyright (C) 2005 by Maurice Massar <vpnc@unix-ag.uni-kl.de> *
* Copyright (C) 2005 by Christoph Thielecke <crissi99@gmx.de> *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "ciscopasswddecoder.h"
#include <tqfile.h>
#include <tqtextstream.h>
#include <tdemessagebox.h>
#include <tdelocale.h>
CiscoPasswdDecoder::CiscoPasswdDecoder(TQString& profileFile)
{
profile = profileFile;
}
CiscoPasswdDecoder::~CiscoPasswdDecoder()
{}
/* read hex strings for "enc_GroupPwd" and "enc_UserPassword" from profile file */
void CiscoPasswdDecoder::readProfileData(TQString& profile, TQString& userData, TQString& groupData)
{
TQFile PcfFile(profile);
TQTextStream stream ( &PcfFile );
if ( PcfFile.open(IO_ReadOnly))
{
TQString line = "";
while ( !stream.atEnd() )
{
line = stream.readLine(); // line of text excluding '\n' and replace all white chars with one blank
if ( !line.startsWith("#") )
{
if (line.startsWith("enc_GroupPwd") || line.startsWith("enc_GroupPwd") )
groupData=line.section('=',1,1).stripWhiteSpace();
if (line.startsWith("enc_UserPassword") || line.startsWith("enc_GroupPwd") )
userData=line.section('=',1,1).stripWhiteSpace();
}
}
PcfFile.close();
}
else
{
KMessageBox::error ( 0, i18n ( "Reading of \"%1\" has been failed!" ).arg ( PcfFile.name() ) );
}
}
int CiscoPasswdDecoder::hex2bin_c(unsigned int c)
{
if ((c >= '0')&&(c <= '9'))
return c - '0';
if ((c >= 'A')&&(c <= 'F'))
return c - 'A' + 10;
if ((c >= 'a')&&(c <= 'f'))
return c - 'a' + 10;
return -1;
}
int CiscoPasswdDecoder::hex2bin(TQString str, TQString& bin, int& len)
{
TQString p;
int i, l;
for (i = 0; str[i] != '\0'; i++)
if (hex2bin_c(TQChar(str[i]).unicode()) == -1)
return EINVAL;
l = i;
if ((l & 1) != 0)
return EINVAL;
l /= 2;
for (i = 0; i < l; i++)
p+= hex2bin_c(TQChar(str[i*2]).unicode()) << 4 | hex2bin_c(TQChar(str[i*2+1]).unicode());
bin = p;
if (len)
len = l;
return 0;
}
int CiscoPasswdDecoder::c_decrypt(TQString ct, int len, char **resp, int reslenp)
{
TQString h1 = ct;
const char *h4 = ct.ascii() + 20;
const char *enc = ct.ascii() + 40;
char ht[20], h2[20], h3[20], key[24];
const char *iv = h1.ascii();
char *res;
gcry_cipher_hd_t ctx;
int reslen;
if (len < 48)
return 0;
len -= 40;
memcpy(ht, h1.ascii(), 20);
ht[19]++;
gcry_md_hash_buffer(GCRY_MD_SHA1, h2, ht, 20);
ht[19] += 2;
gcry_md_hash_buffer(GCRY_MD_SHA1, h3, ht, 20);
memcpy(key, h2, 20);
memcpy(key+20, h3, 4);
/* who cares about parity anyway? */
gcry_md_hash_buffer(GCRY_MD_SHA1, ht, enc, len);
if (memcmp(h4, ht, 20) != 0)
return -1;
res = (char *)malloc(len);
if (res == NULL)
return -1;
gcry_cipher_open(&ctx, GCRY_CIPHER_3DES, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_setkey(ctx, key, 24);
gcry_cipher_setiv(ctx, iv, 8);
gcry_cipher_decrypt(ctx, (unsigned char *)res, len, (unsigned char *)enc, len);
gcry_cipher_close(ctx);
reslen = len - res[len-1];
res[reslen] = '\0';
if (resp)
*resp = res;
reslenp = reslen;
return 0;
}
bool CiscoPasswdDecoder::decodePasswords(TQString& userPasswd, TQString& groupPasswd)
{
TQString encUserPasswd="";
TQString encGroupPasswd="";
int i, len, ret = 0;
char *pw, *pw2;
TQString bin,bin2;
int len2=0;
bool success=true;
readProfileData(profile, encUserPasswd, encGroupPasswd);
if (!encGroupPasswd.isEmpty())
{
ret = hex2bin( encGroupPasswd, bin, len);
if (ret != 0)
{
perror("error: groupPasswd: decoding input");
success=false;
}
ret = c_decrypt(bin, len, &pw, 0);
if (ret != 0)
{
perror("error: groupPasswd: decrypting input");
success=false;
}
else
{
// printf("groupPasswd: %s\n", pw);
// std::cout << "groupPasswd: " << TQString::fromLocal8Bit(pw) << std::endl;
groupPasswd = TQString::fromLocal8Bit(pw);
//free(pw);
}
}
if (!encUserPasswd.isEmpty() )
{
i=0;
len2=0;
ret = 0;
ret = hex2bin( encUserPasswd, bin2, len2);
if (ret != 0)
{
perror("error: userPasswd: decoding input");
success=false;
}
ret = c_decrypt(bin2, len2, &pw2, 0);
//free(bin2);
if (ret != 0)
{
perror("error: userPasswd: decrypting input");
success=false;
}
else
{
// // printf("userPasswd: %s\n", pw2);
// std::cout << "userPasswd " << TQString::fromLocal8Bit(pw2) << std::endl;
userPasswd = TQString::fromLocal8Bit(pw2);
//free(pw);
}
}
return success;
}
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