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/*
*
* Copyright (c) 2015
* name : Francis Banyikwa
* email: mhogomchungu@gmail.com
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef PLUGINS_H
#define PLUGINS_H
#include <QProcess>
#include <QByteArray>
#include <QString>
#include <QObject>
#include <QFile>
#include <QVector>
#include <QDebug>
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#include <gcrypt.h>
#pragma GCC diagnostic warning "-Wdeprecated-declarations"
namespace plugins
{
enum class plugin{ gpg,hmac_key,hmac_key_1,keyKeyFile,luks,steghide } ;
static inline QByteArray gpg( const QVector<QString>& exe,const QString& keyFile,const QString& password )
{
QProcess p ;
if( password.isEmpty() ){
p.start( exe.first(),{ "--no-tty","--yes","--no-mdc-warning","--no-verbose","-d",keyFile } ) ;
}else{
p.start( exe.first(),{ "--no-tty","--yes","--no-mdc-warning","--no-verbose","--passphrase-fd","0","-d",keyFile } ) ;
}
p.waitForStarted() ;
p.write( password.toLatin1() ) ;
p.closeWriteChannel() ;
p.waitForFinished() ;
return p.readAllStandardOutput() ;
}
static inline QByteArray hmac_key( const QString& keyFile,const QString& password )
{
auto _getKey = []( gcry_md_hd_t handle,const QString& keyFile ){
QFile f( keyFile ) ;
if( f.open( QIODevice::ReadOnly ) ){
const int size = 1024 ;
char buffer[ size ] ;
while( true ){
auto e = f.read( buffer,size ) ;
if( e <= 0 ){
break ;
}else{
gcry_md_write( handle,buffer,e ) ;
}
}
auto key = reinterpret_cast< const char * >( gcry_md_read( handle,0 ) ) ;
auto len = static_cast< int >( gcry_md_get_algo_dlen( GCRY_MD_SHA256 ) ) ;
QByteArray r( key,len ) ;
return r.toHex() ;
}else{
return QByteArray() ;
}
} ;
if( gcry_control( GCRYCTL_INITIALIZATION_FINISHED_P ) == 0 ){
gcry_check_version( nullptr ) ;
gcry_control( GCRYCTL_INITIALIZATION_FINISHED,0 ) ;
}
QByteArray key ;
gcry_md_hd_t handle ;
auto r = gcry_md_open( &handle,GCRY_MD_SHA256,GCRY_MD_FLAG_HMAC ) ;
if( r == GPG_ERR_NO_ERROR ){
auto e = password.toLatin1() ;
r = gcry_md_setkey( handle,e.constData(),e.size() ) ;
if( r == GPG_ERR_NO_ERROR ){
key = _getKey( handle,keyFile ) ;
}
gcry_md_close( handle ) ;
}
return key ;
}
static inline QByteArray hmac_key_1( const QVector<QString>& exe,const QString& keyFile,const QString& password )
{
Q_UNUSED( exe )
return hmac_key( keyFile,password ) ;
}
static inline QByteArray keyKeyFile( const QVector<QString>& exe,const QString& keyFile,const QString& password )
{
Q_UNUSED( exe )
QFile f( keyFile ) ;
f.open( QIODevice::ReadOnly ) ;
return password.toLatin1() + f.readAll() ;
}
static inline QByteArray luks( const QVector<QString>& exe,const QString& keyFile,const QString& password )
{
Q_UNUSED( exe )
/*
* we are sending a 4 component structure.
* first component at offset 0 is a u_int32_t structure holding the size of the passphrase
* Second component at offset 4 is a u_int32_t structure holding the size of the contents of luks header
* third component at offset 8 is the passphrase to unlock the LUKS volume.
* last component is at offset that marks the end of the third component.Where this offset will be depends on the length of the passphrase
*/
auto intToByteArray = []( quint32 s ){
const char * e = reinterpret_cast< const char * >( &s ) ;
return QByteArray( e,sizeof( quint32 ) ) ;
} ;
QFile keyfile( keyFile ) ;
QByteArray keyFileSize = intToByteArray( keyfile.size() ) ;
QByteArray passWordSize = intToByteArray( password.size() ) ;
keyfile.open( QIODevice::ReadOnly ) ;
return passWordSize + keyFileSize + password.toLatin1() + keyfile.readAll() ;
}
static inline QByteArray steghide( const QVector<QString>& exe,const QString& keyFile,const QString& password ){
/*
* TODO: look into passing the passphrase more securely
*/
QProcess p ;
p.start( exe.first(),{ "--extract","-sf",keyFile,"-xf","-","-p",password } ) ;
p.waitForFinished( -1 ) ;
return p.readAllStandardOutput() ;
}
} //namespace plugins
#endif // PLUGINS_H
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