nextcloud/apps/files_encryption/lib/proxy.php

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<?php
/**
* ownCloud
*
* @author Sam Tuke, Robin Appelman
* @copyright 2012 Sam Tuke samtuke@owncloud.com, Robin Appelman
* icewind1991@gmail.com
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*
* 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/>.
*
*/
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/**
* transparent encryption
*/
namespace OCA\Encryption;
class Proxy extends \OC_FileProxy {
private static $blackList = null; //mimetypes blacklisted from encryption
private static $enableEncryption = null;
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/**
* Check if a file requires encryption
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* @param string $path
* @return bool
*
* Tests if server side encryption is enabled, and file is allowed by blacklists
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*/
private static function shouldEncrypt( $path ) {
if ( is_null( self::$enableEncryption ) ) {
if (
\OCP\Config::getAppValue( 'files_encryption', 'enable_encryption', 'true' ) == 'true'
&& Crypt::mode() == 'server'
) {
self::$enableEncryption = true;
} else {
self::$enableEncryption = false;
}
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}
if ( !self::$enableEncryption ) {
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return false;
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}
if ( is_null(self::$blackList ) ) {
self::$blackList = explode(',', \OCP\Config::getAppValue( 'files_encryption','type_blacklist','jpg,png,jpeg,avi,mpg,mpeg,mkv,mp3,oga,ogv,ogg' ) );
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}
if ( Crypt::isEncryptedContent( $path ) ) {
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return true;
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}
$extension = substr( $path, strrpos( $path,'.' ) +1 );
if ( array_search( $extension, self::$blackList ) === false ){
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return true;
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}
return false;
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}
public function preFile_put_contents( $path, &$data ) {
if ( self::shouldEncrypt( $path ) ) {
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if ( !is_resource( $data ) ) { //stream put contents should have been converted to fopen
// Set the filesize for userland, before encrypting
$size = strlen( $data );
// Disable encryption proxy to prevent recursive calls
\OC_FileProxy::$enabled = false;
// Encrypt plain data and fetch key
$encrypted = Crypt::keyEncryptKeyfile( $data, Keymanager::getPublicKey() );
// Replace plain content with encrypted content by reference
$data = $encrypted['data'];
$filePath = explode( '/', $path );
$filePath = array_slice( $filePath, 3 );
$filePath = '/' . implode( '/', $filePath );
# TODO: make keyfile dir dynamic from app config
$view = new \OC_FilesystemView( '/' . \OCP\USER::getUser() . '/files_encryption/keyfiles' );
// Save keyfile for newly encrypted file in parallel directory tree
Keymanager::setFileKey( $filePath, $encrypted['key'], $view, '\OC_DB' );
// Update the file cache with file info
\OC_FileCache::put( $path, array( 'encrypted'=>true, 'size' => $size ), '' );
// Re-enable proxy - our work is done
\OC_FileProxy::$enabled = true;
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}
}
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}
public function postFile_get_contents( $path, $data ) {
# TODO: Use dependency injection to add required args for view and user etc. to this method
// Disable encryption proxy to prevent recursive calls
\OC_FileProxy::$enabled = false;
if (
Crypt::mode() == 'server'
&& Crypt::isEncryptedContent( $data )
) {
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$filePath = explode( '/', $path );
$filePath = array_slice( $filePath, 3 );
$filePath = '/' . implode( '/', $filePath );
$cached = \OC_FileCache_Cached::get( $path, '' );
$keyFile = Keymanager::getFileKey( $filePath );
$data = Crypt::keyDecryptKeyfile( $data, $keyFile, $_SESSION['enckey'] );
} elseif (
Crypt::mode() == 'server'
&& isset( $_SESSION['legacyenckey'] )
//&& Crypt::isEncryptedMeta( $path )
) {
$data = Crypt::legacyDecrypt( $data, $_SESSION['legacyenckey'] );
//trigger_error($data);
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}
\OC_FileProxy::$enabled = true;
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return $data;
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}
public function postFopen( $path, &$result ){
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if ( !$result ) {
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return $result;
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}
// Disable encryption proxy to prevent recursive calls
\OC_FileProxy::$enabled = false;
$meta = stream_get_meta_data( $result );
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// trigger_error("\$meta(result) = ".var_export($meta, 1));
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$view = new \OC_FilesystemView( '' );
$util = new Util( $view, \OCP\USER::getUser());
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// If file is already encrypted, decrypt using crypto protocol
if ( Crypt::mode() == 'server' && $util->isEncryptedPath( $path ) ) {
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// Close the original encrypted file
fclose( $result );
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// Open the file using the crypto protocol and let
// it do the decryption work instead
$result = fopen( 'crypt://' . $path, $meta['mode'] );
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} elseif (
self::shouldEncrypt( $path )
and $meta ['mode'] != 'r'
and $meta['mode'] != 'rb'
) {
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// If the file should be encrypted and has been opened for
// reading only
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// Reformat path for use with OC_FSV
$path_split = explode( '/', $path );
$path_f = implode( array_slice( $path_split, 3 ) );
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// trigger_error("$path_f = ".var_export($path_f, 1));
if (
$view->file_exists( $path )
and $view->filesize( $path ) > 0
) {
$x = $view->file_get_contents( $path );
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trigger_error( "size = ".var_export( $x, 1 ) );
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$tmp = tmpfile();
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// trigger_error("Result meta = ".var_export($meta, 1));
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// // Make a temporary copy of the original file
// \OCP\Files::streamCopy( $result, $tmp );
//
// // Close the original stream, we'll return another one
// fclose( $result );
//
// $view->file_put_contents( $path_f, $tmp );
//
// fclose( $tmp );
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}
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$result = fopen( 'crypt://'.$path_f, $meta['mode'] );
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}
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// Re-enable the proxy
\OC_FileProxy::$enabled = true;
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return $result;
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}
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public function postGetMimeType($path,$mime){
if( Crypt::isEncryptedContent($path)){
$mime = \OCP\Files::getMimeType('crypt://'.$path,'w');
}
return $mime;
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}
public function postStat($path,$data){
if( Crypt::isEncryptedContent($path)){
$cached= \OC_FileCache_Cached::get($path,'');
$data['size']=$cached['size'];
}
return $data;
}
public function postFileSize($path,$size){
if( Crypt::isEncryptedContent($path)){
$cached = \OC_FileCache_Cached::get($path,'');
return $cached['size'];
}else{
return $size;
}
}
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}