266 lines
7.5 KiB
PHP
266 lines
7.5 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Sam Tuke, Frank Karlitschek
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* @copyright 2012 Sam Tuke samtuke@owncloud.com,
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* Frank Karlitschek frank@owncloud.org
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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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// Todo:
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// - Crypt/decrypt button in the userinterface
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// - Setting if crypto should be on by default
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// - Add a setting "Don´t encrypt files larger than xx because of performance reasons"
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// - Transparent decrypt/encrypt in filesystem.php. Autodetect if a file is encrypted (.encrypted extension)
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// - 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
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// - IMPORTANT! Check if the block lenght of the encrypted data stays the same
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namespace OCA_Encryption;
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/**
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* @brief Class for utilities relating to encrypted file storage system
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* @param $view OC_FilesystemView object, expected to have OC '/' as root path
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* @param $client flag indicating status of client side encryption. Currently
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* unused, likely to become obsolete shortly
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*/
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class Util {
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# DONE: add method to check if file is encrypted using new system
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# DONE: add method to check if file is encrypted using old system
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# DONE: add method to fetch legacy key
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# DONE: add method to decrypt legacy encrypted data
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# TODO: add method to encrypt all user files using new system
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# TODO: add method to decrypt all user files using new system
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# TODO: add method to encrypt all user files using old system
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# TODO: add method to decrypt all user files using old system
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# TODO: fix / test the crypt stream proxy class
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# TODO: add support for optional recovery user in case of lost passphrase / keys
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# TODO: add admin optional required long passphrase for users
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# TODO: implement flag system to allow user to specify encryption by folder, subfolder, etc.
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# TODO: add UI buttons for encrypt / decrypt everything?
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# TODO: test new encryption with webdav
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# TODO: test new encryption with versioning
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# TODO: test new encryption with sharing
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# TODO: test new encryption with proxies
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private $view; // OC_FilesystemView object for filesystem operations
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private $pwd; // User Password
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private $client; // Client side encryption mode flag
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public function __construct( \OC_FilesystemView $view, $userId, $client = false ) {
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$this->view = $view;
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$this->userId = $userId;
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$this->client = $client;
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$this->publicKeyDir = '/' . 'public-keys';
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$this->encryptionDir = '/' . $this->userId . '/' . 'files_encryption';
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$this->keyfilesPath = $this->encryptionDir . '/' . 'keyfiles';
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$this->publicKeyPath = $this->publicKeyDir . '/' . $this->userId . '.public.key'; // e.g. data/public-keys/admin.public.key
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$this->privateKeyPath = $this->encryptionDir . '/' . $this->userId . '.private.key'; // e.g. data/admin/admin.private.key
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}
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public function ready() {
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if(
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!$this->view->file_exists( $this->keyfilesPath )
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or !$this->view->file_exists( $this->publicKeyPath )
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or !$this->view->file_exists( $this->privateKeyPath )
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) {
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return false;
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} else {
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return true;
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}
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}
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/**
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* @brief Sets up user folders and keys for serverside encryption
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* @param $passphrase passphrase to encrypt server-stored private key with
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*/
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public function setupServerSide( $passphrase = null ) {
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// Log changes to user's filesystem
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$this->appInfo = \OC_APP::getAppInfo( 'files_encryption' );
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\OC_Log::write( $this->appInfo['name'], 'File encryption for user "' . $this->userId . '" will be set up' , \OC_Log::INFO );
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// Create shared public key directory
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if( !$this->view->file_exists( $this->publicKeyDir ) ) {
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$this->view->mkdir( $this->publicKeyDir );
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}
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// Create encryption app directory
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if( !$this->view->file_exists( $this->encryptionDir ) ) {
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$this->view->mkdir( $this->encryptionDir );
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}
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// Create mirrored keyfile directory
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if( !$this->view->file_exists( $this->keyfilesPath ) ) {
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$this->view->mkdir( $this->keyfilesPath );
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}
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// Create user keypair
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if (
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!$this->view->file_exists( $this->publicKeyPath )
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or !$this->view->file_exists( $this->privateKeyPath )
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) {
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// Generate keypair
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$keypair = Crypt::createKeypair();
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\OC_FileProxy::$enabled = false;
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// Save public key
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$this->view->file_put_contents( $this->publicKeyPath, $keypair['publicKey'] );
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// Encrypt private key with user pwd as passphrase
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$encryptedPrivateKey = Crypt::symmetricEncryptFileContent( $keypair['privateKey'], $passphrase );
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// Save private key
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$this->view->file_put_contents( $this->privateKeyPath, $encryptedPrivateKey );
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\OC_FileProxy::$enabled = true;
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}
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}
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/**
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* @brief Get the blowfish encryption handeler for a key
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* @param $key string (optional)
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* @return Crypt_Blowfish blowfish object
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*
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* if the key is left out, the default handeler will be used
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*/
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public function getBlowfish( $key = '' ) {
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if ( $key ) {
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return new \Crypt_Blowfish( $key );
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} else {
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return false;
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}
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}
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/**
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* @brief Fetch the legacy encryption key from user files
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* @param string $login used to locate the legacy key
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* @param string $passphrase used to decrypt the legacy key
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* @return true / false
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*
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* if the key is left out, the default handeler will be used
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*/
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public function getLegacyKey( $passphrase ) {
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// Disable proxies to prevent attempt to automatically decrypt key
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OC_FileProxy::$enabled = false;
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if (
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$passphrase
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and $key = $this->view->file_get_contents( '/encryption.key' )
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) {
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OC_FileProxy::$enabled = true;
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if ( $this->legacyKey = $this->legacyDecrypt( $key, $passphrase ) ) {
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return true;
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} else {
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return false;
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}
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} else {
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OC_FileProxy::$enabled = true;
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return false;
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}
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}
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/**
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* @brief encrypts content using legacy blowfish system
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* @param $content the cleartext message you want to encrypt
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* @param $key the encryption key (optional)
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* @returns encrypted content
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*
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* This function encrypts an content
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*/
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public function legacyEncrypt( $content, $passphrase = '' ) {
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$bf = $this->getBlowfish( $passphrase );
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return $bf->encrypt( $content );
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}
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/**
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* @brief decryption of an content
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* @param $content the cleartext message you want to decrypt
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* @param $key the encryption key (optional)
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* @returns cleartext content
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*
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* This function decrypts an content
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*/
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public function legacyDecrypt( $content, $passphrase = '' ) {
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$bf = $this->getBlowfish( $passphrase );
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$data = $bf->decrypt( $content );
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return $data;
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}
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/**
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* @brief Re-encryptes a legacy blowfish encrypted file using AES with integrated IV
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* @param $legacyContent the legacy encrypted content to re-encrypt
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* @returns cleartext content
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*
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* This function decrypts an content
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*/
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public function legacyRecrypt( $legacyContent ) {
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# TODO: write me
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}
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}
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