nextcloud/apps/files_encryption/hooks/hooks.php

167 lines
5.0 KiB
PHP

<?php
/**
* ownCloud
*
* @author Sam Tuke
* @copyright 2012 Sam Tuke samtuke@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/>.
*
*/
namespace OCA\Encryption;
// Include PHPSecLib for passphrase manipulation functions
require_once \OC::$SERVERROOT . '/' . '3rdparty' . '/' . 'phpseclib' . '/' . 'Math' . '/' . 'BigInteger.php';
require_once \OC::$SERVERROOT . '/' . '3rdparty' . '/' . 'phpseclib' . '/' . 'Crypt' . '/' . 'Hash.php';
require_once \OC::$SERVERROOT . '/' . '3rdparty' . '/' . 'phpseclib' . '/' . 'Crypt' . '/' . 'Random.php';
require_once \OC::$SERVERROOT . '/' . '3rdparty' . '/' . 'phpseclib' . '/' . 'Crypt' . '/' . 'RSA.php';
/**
* Class for hook specific logic
*/
class Hooks {
# TODO: use passphrase for encrypting private key that is separate to the login password
/**
* @brief Startup encryption backend upon user login
* @note This method should never be called for users using client side encryption
*/
public static function login( $params ) {
// if ( Crypt::mode( $params['uid'] ) == 'server' ) {
# TODO: use lots of dependency injection here
$view = new \OC_FilesystemView( '/' );
$util = new Util( $view, $params['uid'] );
if ( ! $util->ready() ) {
\OC_Log::write( 'Encryption library', 'User account "' . $params['uid'] . '" is not ready for encryption; configuration started' , \OC_Log::DEBUG );
return $util->setupServerSide( $params['password'] );
}
\OC_FileProxy::$enabled = false;
$encryptedKey = Keymanager::getPrivateKey( $params['uid'], $view );
\OC_FileProxy::$enabled = true;
# TODO: dont manually encrypt the private keyfile - use the config options of openssl_pkey_export instead for better mobile compatibility
//trigger_error( "\$encryptedKey = ".var_export($encryptedKey)." \n\n\$params['password'] = ".var_export($params['password'] ) );
// trigger_error( "\$params['password'] = {$params['password']}" );
$privateKey = Crypt::symmetricDecryptFileContent( $encryptedKey, $params['password'] );
$session = new Session();
$session->setPrivateKey( $privateKey, $params['uid'] );
$view1 = new \OC_FilesystemView( '/' . $params['uid'] );
// Set legacy encryption key if it exists, to support
// depreciated encryption system
if (
$view1->file_exists( 'encryption.key' )
&& $legacyKey = $view1->file_get_contents( 'encryption.key' )
) {
$_SESSION['legacyenckey'] = Crypt::legacyDecrypt( $legacyKey, $params['password'] );
// trigger_error('leg enc key = '.$_SESSION['legacyenckey']);
}
// }
return true;
}
/**
* @brief Change a user's encryption passphrase
* @param array $params keys: uid, password
*/
public static function setPassphrase( $params ) {
// Only attempt to change passphrase if server-side encryption
// is in use (client-side encryption does not have access to
// the necessary keys)
if ( Crypt::mode() == 'server' ) {
$rsa = new \Crypt_RSA();
// Load old passphrase
$rsa->setPassword( $params['password'] );
// Load user's private key
$rsa->loadKey( $_SESSION['privateKey'] );
// Set new passphrase
$rsa->setPassword('new_password');
// Get modified private key
$privateKey = $rsa->getPrivateKey();
// Save private key
Keymanager::setPrivateKey( $privateKey );
// Get modified public key
$publicKey = $rsa->getPublicKey();
// Save public key
Keymanager::setPublicKey( $publicKey );
# NOTE: Do we need to update session manually here or
# will forced logout see to this?
}
}
/**
* @brief update the encryption key of the file uploaded by the client
*/
public static function updateKeyfile( $params ) {
if ( Crypt::mode() == 'client' ) {
if ( isset( $params['properties']['key'] ) ) {
Keymanager::setFileKey( $params['path'], $params['properties']['key'] );
} else {
\OC_Log::write(
'Encryption library', "Client side encryption is enabled but the client doesn't provide a encryption key for the file!"
, \OC_Log::ERROR
);
error_log( "Client side encryption is enabled but the client doesn't provide an encryption key for the file!" );
}
}
}
}
?>