123 lines
3.3 KiB
PHP
123 lines
3.3 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Robin Appelman
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* @copyright 2011 Robin Appelman icewind1991@gmail.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* transparent encryption
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*/
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class OC_FileProxy_Encryption extends OC_FileProxy{
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private static $blackList=null; //mimetypes blacklisted from encryption
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private static $metaData=array(); //metadata cache
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/**
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* check if a file should be encrypted during write
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* @param string $path
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* @return bool
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*/
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private static function shouldEncrypt($path){
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if(is_null(self::$blackList)){
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self::$blackList=explode(',',OC_Appconfig::getValue('files_encryption','type_blacklist','jpg,png,jpeg,avi,mpg,mpeg,mkv,mp3,oga,ogv,ogg'));
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}
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if(isset(self::$metaData[$path])){
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$metadata=self::$metaData[$path];
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}else{
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$metadata=OC_FileCache::get($path);
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self::$metaData[$path]=$metadata;
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}
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if($metadata['encrypted']){
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return true;
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}
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$extention=substr($path,strrpos($path,'.')+1);
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if(array_search($extention,self::$blackList)===false){
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return true;
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}
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}
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/**
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* check if a file is encrypted
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* @param string $path
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* @return bool
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*/
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private static function isEncrypted($path){
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if(isset(self::$metaData[$path])){
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$metadata=self::$metaData[$path];
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}else{
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$metadata=OC_FileCache::get($path);
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self::$metaData[$path]=$metadata;
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}
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return (bool)$metadata['encrypted'];
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}
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public function preFile_put_contents($path,&$data){
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if(self::shouldEncrypt($path)){
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if (is_resource($data)) {
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$id=md5($path);
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OC_CryptStream::$sourceStreams[$id]=array('path'=>$path,'stream'=>$data);
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$data=fopen('crypt://streams/'.$id,'r');
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}else{
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$data=OC_Crypt::blockEncrypt($data);
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}
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}
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}
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public function postFile_get_contents($path,$data){
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if(self::isEncrypted($path)){
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$data=OC_Crypt::blockDecrypt($data);
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}
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return $data;
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}
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public function postFopen($path,&$result){
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if(!$result){
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return $result;
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}
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$meta=stream_get_meta_data($result);
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if(self::isEncrypted($path)){
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fclose($result);
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$result=fopen('crypt://'.$path,$meta['mode']);
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}elseif(self::shouldEncrypt($path) and $meta['mode']!='r'){
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if(OC_Filesystem::file_exists($path)){
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//first encrypt the target file so we don't end up with a half encrypted file
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OC_Log::write('files_encryption','Decrypting '.$path.' before writing',OC_Log::DEBUG);
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if($result){
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fclose($result);
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}
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$tmpFile=OC_Filesystem::toTmpFile($path);
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OC_Filesystem::fromTmpFile($tmpFile,$path);
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}
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$result=fopen('crypt://'.$path,$meta['mode']);
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}
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return $result;
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}
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public function preReadFile($path){
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if(self::isEncrypted($path)){
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$stream=fopen('crypt://'.$path,'r');
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while(!feof($stream)){
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print(fread($stream,8192));
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}
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return false;//cancel the original request
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}
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}
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}
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