219 lines
5.9 KiB
PHP
219 lines
5.9 KiB
PHP
<?php
|
||
/**
|
||
* ownCloud
|
||
*
|
||
* @author Frank Karlitschek
|
||
* @copyright 2012 Frank Karlitschek frank@owncloud.org
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
|
||
* License as published by the Free Software Foundation; either
|
||
* version 3 of the License, or 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 AFFERO GENERAL PUBLIC LICENSE for more details.
|
||
*
|
||
* You should have received a copy of the GNU Affero General Public
|
||
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||
*
|
||
*/
|
||
|
||
|
||
|
||
// Todo:
|
||
// - Crypt/decrypt button in the userinterface
|
||
// - Setting if crypto should be on by default
|
||
// - Add a setting "Don´t encrypt files larger than xx because of performance reasons"
|
||
// - Transparent decrypt/encrypt in filesystem.php. Autodetect if a file is encrypted (.encrypted extension)
|
||
// - Don't use a password directly as encryption key. but a key which is stored on the server and encrypted with the user password. -> password change faster
|
||
// - IMPORTANT! Check if the block lenght of the encrypted data stays the same
|
||
|
||
|
||
require_once 'Crypt_Blowfish/Blowfish.php';
|
||
|
||
/**
|
||
* This class is for crypting and decrypting
|
||
*/
|
||
class OC_Crypt {
|
||
static private $bf = null;
|
||
|
||
public static function loginListener($params) {
|
||
self::init($params['uid'],$params['password']);
|
||
}
|
||
|
||
public static function init($login,$password) {
|
||
$view=new OC_FilesystemView('/');
|
||
if(!$view->file_exists('/'.$login)) {
|
||
$view->mkdir('/'.$login);
|
||
}
|
||
|
||
OC_FileProxy::$enabled=false;
|
||
if(!$view->file_exists('/'.$login.'/encryption.key')) {// does key exist?
|
||
OC_Crypt::createkey($login,$password);
|
||
}
|
||
$key=$view->file_get_contents('/'.$login.'/encryption.key');
|
||
OC_FileProxy::$enabled=true;
|
||
$_SESSION['enckey']=OC_Crypt::decrypt($key, $password);
|
||
}
|
||
|
||
|
||
/**
|
||
* get the blowfish encryption handeler for a key
|
||
* @param string $key (optional)
|
||
* @return Crypt_Blowfish
|
||
*
|
||
* if the key is left out, the default handeler will be used
|
||
*/
|
||
public static function getBlowfish($key='') {
|
||
if($key) {
|
||
return new Crypt_Blowfish($key);
|
||
}else{
|
||
if(!isset($_SESSION['enckey'])) {
|
||
return false;
|
||
}
|
||
if(!self::$bf) {
|
||
self::$bf=new Crypt_Blowfish($_SESSION['enckey']);
|
||
}
|
||
return self::$bf;
|
||
}
|
||
}
|
||
|
||
public static function createkey($username,$passcode) {
|
||
// generate a random key
|
||
$key=mt_rand(10000,99999).mt_rand(10000,99999).mt_rand(10000,99999).mt_rand(10000,99999);
|
||
|
||
// encrypt the key with the passcode of the user
|
||
$enckey=OC_Crypt::encrypt($key,$passcode);
|
||
|
||
// Write the file
|
||
$proxyEnabled=OC_FileProxy::$enabled;
|
||
OC_FileProxy::$enabled=false;
|
||
$view=new OC_FilesystemView('/'.$username);
|
||
$view->file_put_contents('/encryption.key',$enckey);
|
||
OC_FileProxy::$enabled=$proxyEnabled;
|
||
}
|
||
|
||
public static function changekeypasscode($oldPassword, $newPassword) {
|
||
if(OCP\User::isLoggedIn()) {
|
||
$username=OCP\USER::getUser();
|
||
$view=new OC_FilesystemView('/'.$username);
|
||
|
||
// read old key
|
||
$key=$view->file_get_contents('/encryption.key');
|
||
|
||
// decrypt key with old passcode
|
||
$key=OC_Crypt::decrypt($key, $oldPassword);
|
||
|
||
// encrypt again with new passcode
|
||
$key=OC_Crypt::encrypt($key, $newPassword);
|
||
|
||
// store the new key
|
||
$view->file_put_contents('/encryption.key', $key );
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @brief encrypts an content
|
||
* @param $content the cleartext message you want to encrypt
|
||
* @param $key the encryption key (optional)
|
||
* @returns encrypted content
|
||
*
|
||
* This function encrypts an content
|
||
*/
|
||
public static function encrypt( $content, $key='') {
|
||
$bf = self::getBlowfish($key);
|
||
return $bf->encrypt($content);
|
||
}
|
||
|
||
/**
|
||
* @brief decryption of an content
|
||
* @param $content the cleartext message you want to decrypt
|
||
* @param $key the encryption key (optional)
|
||
* @returns cleartext content
|
||
*
|
||
* This function decrypts an content
|
||
*/
|
||
public static function decrypt( $content, $key='') {
|
||
$bf = self::getBlowfish($key);
|
||
$data=$bf->decrypt($content);
|
||
return $data;
|
||
}
|
||
|
||
/**
|
||
* @brief encryption of a file
|
||
* @param string $source
|
||
* @param string $target
|
||
* @param string $key the decryption key
|
||
*
|
||
* This function encrypts a file
|
||
*/
|
||
public static function encryptFile( $source, $target, $key='') {
|
||
$handleread = fopen($source, "rb");
|
||
if($handleread!=FALSE) {
|
||
$handlewrite = fopen($target, "wb");
|
||
while (!feof($handleread)) {
|
||
$content = fread($handleread, 8192);
|
||
$enccontent=OC_CRYPT::encrypt( $content, $key);
|
||
fwrite($handlewrite, $enccontent);
|
||
}
|
||
fclose($handlewrite);
|
||
fclose($handleread);
|
||
}
|
||
}
|
||
|
||
|
||
/**
|
||
* @brief decryption of a file
|
||
* @param string $source
|
||
* @param string $target
|
||
* @param string $key the decryption key
|
||
*
|
||
* This function decrypts a file
|
||
*/
|
||
public static function decryptFile( $source, $target, $key='') {
|
||
$handleread = fopen($source, "rb");
|
||
if($handleread!=FALSE) {
|
||
$handlewrite = fopen($target, "wb");
|
||
while (!feof($handleread)) {
|
||
$content = fread($handleread, 8192);
|
||
$enccontent=OC_CRYPT::decrypt( $content, $key);
|
||
if(feof($handleread)) {
|
||
$enccontent=rtrim($enccontent, "\0");
|
||
}
|
||
fwrite($handlewrite, $enccontent);
|
||
}
|
||
fclose($handlewrite);
|
||
fclose($handleread);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* encrypt data in 8192b sized blocks
|
||
*/
|
||
public static function blockEncrypt($data, $key='') {
|
||
$result='';
|
||
while(strlen($data)) {
|
||
$result.=self::encrypt(substr($data,0,8192),$key);
|
||
$data=substr($data,8192);
|
||
}
|
||
return $result;
|
||
}
|
||
|
||
/**
|
||
* decrypt data in 8192b sized blocks
|
||
*/
|
||
public static function blockDecrypt($data, $key='',$maxLength=0) {
|
||
$result='';
|
||
while(strlen($data)) {
|
||
$result.=self::decrypt(substr($data,0,8192),$key);
|
||
$data=substr($data,8192);
|
||
}
|
||
if($maxLength>0) {
|
||
return substr($result,0,$maxLength);
|
||
}else{
|
||
return rtrim($result, "\0");
|
||
}
|
||
}
|
||
}
|