133 lines
4 KiB
PHP
133 lines
4 KiB
PHP
<?php
|
||
/**
|
||
* ownCloud
|
||
*
|
||
* @author Sam Tuke, Frank Karlitschek
|
||
* @copyright 2012 Sam Tuke samtuke@owncloud.com,
|
||
* 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
|
||
|
||
namespace OCA_Encryption;
|
||
|
||
/**
|
||
* Class for utilities relating to encrypted file storage system
|
||
*/
|
||
|
||
class Util {
|
||
|
||
private $view; // OC_FilesystemView object for filesystem operations
|
||
private $pwd; // User Password
|
||
private $client; // Client side encryption mode flag
|
||
|
||
/**
|
||
* @brief get a list of all available versions of a file in descending chronological order
|
||
* @param $filename file to find versions of, relative to the user files dir
|
||
* @param $count number of versions to return
|
||
* @returns array
|
||
*/
|
||
public function __construct( \OC_FilesystemView $view, $client = false ) {
|
||
|
||
$this->view = $view;
|
||
$this->client = $client;
|
||
|
||
}
|
||
|
||
public function ready() {
|
||
|
||
if(
|
||
!$this->view->file_exists( '/' . 'keyfiles' )
|
||
or !$this->view->file_exists( '/' . 'keypair' )
|
||
or !$this->view->file_exists( '/' . 'keypair' . '/'. 'encryption.public.key' )
|
||
or !$this->view->file_exists( '/' . 'keypair' . '/'. 'encryption.private.key' )
|
||
) {
|
||
|
||
return false;
|
||
|
||
} else {
|
||
|
||
return true;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
public function setup( $passphrase = null ) {
|
||
|
||
$publicKeyFileName = 'encryption.public.key';
|
||
$privateKeyFileName = 'encryption.private.key';
|
||
|
||
// Log changes to user's filesystem
|
||
$this->appInfo = \OC_APP::getAppInfo( 'files_encryption' );
|
||
|
||
\OC_Log::write( $this->appInfo['name'], 'File encryption for user will be set up' , \OC_Log::INFO );
|
||
|
||
// Create mirrored keyfile directory
|
||
if( !$this->view->file_exists( '/' . 'keyfiles' ) ) {
|
||
|
||
$this->view->mkdir( '/'. 'keyfiles' );
|
||
|
||
}
|
||
|
||
// Create keypair directory
|
||
if( !$this->view->file_exists( '/'. 'keypair' ) ) {
|
||
|
||
$this->view->mkdir( '/'. 'keypair' );
|
||
|
||
}
|
||
|
||
// Create user keypair
|
||
if (
|
||
!$this->view->file_exists( '/'. 'keypair'. '/' . $publicKeyFileName )
|
||
or !$this->view->file_exists( '/'. 'keypair'. '/' . $privateKeyFileName )
|
||
) {
|
||
|
||
// Generate keypair
|
||
$keypair = Crypt::createKeypair();
|
||
|
||
// Save public key
|
||
$this->view->file_put_contents( '/'. 'keypair'. '/' . $publicKeyFileName, $keypair['publicKey'] );
|
||
|
||
if ( $this->client == false ) {
|
||
|
||
# TODO: Use proper IV in encryption
|
||
|
||
// Encrypt private key with user pwd as passphrase
|
||
$encryptedPrivateKey = Crypt::createSymmetricKeyfile( $keypair['privateKey'], $passphrase );
|
||
|
||
// $iv = openssl_random_pseudo_bytes(16);
|
||
$this->view->file_put_contents( '/'. 'keypair'. '/' . $privateKeyFileName, $encryptedPrivateKey );
|
||
|
||
} else {
|
||
|
||
# TODO PHASE2: add public key to keyserver for client-side
|
||
# TODO PHASE2: encrypt private key using password / new client side specified key, instead of existing user pwd
|
||
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
}
|