355 lines
9.0 KiB
PHP
355 lines
9.0 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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# Web UI:
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## DONE: files created via web ui are encrypted
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## DONE: file created & encrypted via web ui are readable in web ui
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## DONE: file created & encrypted via web ui are readable via webdav
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# WebDAV:
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## DONE: new data filled files added via webdav get encrypted
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## DONE: new data filled files added via webdav are readable via webdav
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## DONE: reading unencrypted files when encryption is enabled works via webdav
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## DONE: files created & encrypted via web ui are readable via webdav
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# Legacy support:
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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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# Admin UI:
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## DONE: changing user password also changes encryption passphrase
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## TODO: add support for optional recovery in case of lost passphrase / keys
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## TODO: add admin optional required long passphrase for users
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## TODO: add UI buttons for encrypt / decrypt everything
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## TODO: implement flag system to allow user to specify encryption by folder, subfolder, etc.
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# Sharing:
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## TODO: add support for encrypting to multiple public keys
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## TODO: add support for decrypting to multiple private keys
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# Integration testing:
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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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private $publicKeyDir; // Directory containing all public user keys
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private $encryptionDir; // Directory containing user's files_encryption
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private $keyfilesPath; // Directory containing user's keyfiles
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private $publicKeyPath; // Path to user's public key
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private $privateKeyPath; // Path to user's private key
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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( $passphrase = null ) {
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// Create shared public key directory
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if( !$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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return true;
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}
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public function findFiles( $directory, $type = 'plain' ) {
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# TODO: test finding non plain content
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if ( $handle = $this->view->opendir( $directory ) ) {
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while ( false !== ( $file = readdir( $handle ) ) ) {
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if (
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$file != "."
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&& $file != ".."
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) {
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$filePath = $directory . '/' . $this->view->getRelativePath( '/' . $file );
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var_dump($filePath);
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if ( $this->view->is_dir( $filePath ) ) {
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$this->findFiles( $filePath );
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} elseif ( $this->view->is_file( $filePath ) ) {
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if ( $type == 'plain' ) {
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$this->files[] = array( 'name' => $file, 'path' => $filePath );
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} elseif ( $type == 'encrypted' ) {
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if ( Crypt::isEncryptedContent( $this->view->file_get_contents( $filePath ) ) ) {
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$this->files[] = array( 'name' => $file, 'path' => $filePath );
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}
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} elseif ( $type == 'legacy' ) {
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if ( Crypt::isLegacyEncryptedContent( $this->view->file_get_contents( $filePath ) ) ) {
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$this->files[] = array( 'name' => $file, 'path' => $filePath );
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}
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}
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}
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}
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}
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if ( !empty( $this->files ) ) {
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return $this->files;
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} else {
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return false;
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}
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}
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return false;
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}
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/**
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* @brief Check if a given path identifies an encrypted file
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* @return true / false
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*/
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public function isEncryptedPath( $path ) {
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// Disable encryption proxy so data retreived is in its
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// original form
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\OC_FileProxy::$enabled = false;
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$data = $this->view->file_get_contents( $path );
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\OC_FileProxy::$enabled = true;
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return Crypt::isEncryptedContent( $data );
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}
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public function encryptAll( $directory ) {
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$plainFiles = $this->findFiles( $this->view, 'plain' );
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if ( $this->encryptFiles( $plainFiles ) ) {
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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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}
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public static function changekeypasscode( $oldPassword, $newPassword ) {
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if( \OCP\User::isLoggedIn() ) {
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$key = Keymanager::getPrivateKey( $this->userId, $this->view );
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if ( ( $key = Crypt::symmetricDecryptFileContent( $key, $oldPassword ) ) ) {
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if ( ( $key = Crypt::symmetricEncryptFileContent( $key, $newPassword )) ) {
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Keymanager::setPrivateKey( $key );
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return true;
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}
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}
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}
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return false;
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}
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public function getPath( $pathName ) {
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switch ( $pathName ) {
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case 'publicKeyDir':
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return $this->publicKeyDir;
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break;
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case 'encryptionDir':
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return $this->encryptionDir;
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break;
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case 'keyfilesPath':
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return $this->keyfilesPath;
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break;
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case 'publicKeyPath':
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return $this->publicKeyPath;
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break;
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case 'privateKeyPath':
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return $this->privateKeyPath;
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break;
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}
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}
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}
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