1224 lines
30 KiB
PHP
1224 lines
30 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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# Bugs
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# ----
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# Sharing a file to a user without encryption set up will not provide them with access but won't notify the sharer
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# Sharing all files to admin for recovery purposes still in progress
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# Possibly public links are broken (not tested since last merge of master)
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# Missing features
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# ----------------
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# Make sure user knows if large files weren't encrypted
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# Test
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# ----
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# Test that writing files works when recovery is enabled, and sharing API is disabled
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# Test trashbin support
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// Old 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
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// reasons"
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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 OC_FilesystemView $view expected to have OC '/' as root path
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* @param string $userId ID of the logged in user
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* @param int $client 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
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//// 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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// 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: implement flag system to allow user to specify encryption by folder, subfolder, etc.
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// Integration testing:
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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 $userId; // ID of the currently logged-in user
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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; // Dir containing all public user keys
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private $encryptionDir; // Dir containing user's files_encryption
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private $keyfilesPath; // Dir containing user's keyfiles
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private $shareKeysPath; // Dir containing env keys for shared files
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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->userDir = '/' . $this->userId;
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$this->fileFolderName = 'files';
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$this->userFilesDir = '/' . $this->userId . '/' . $this->fileFolderName; // TODO: Does this need to be user configurable?
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$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->shareKeysPath = $this->encryptionDir . '/' . 'share-keys';
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$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->encryptionDir )
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or ! $this->view->file_exists( $this->keyfilesPath )
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or ! $this->view->file_exists( $this->shareKeysPath )
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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( $passphrase = null ) {
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// Set directories to check / create
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$setUpDirs = array(
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$this->userDir
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, $this->userFilesDir
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, $this->publicKeyDir
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, $this->encryptionDir
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, $this->keyfilesPath
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, $this->shareKeysPath
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);
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// Check / create all necessary dirs
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foreach ( $setUpDirs as $dirPath ) {
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if( !$this->view->file_exists( $dirPath ) ) {
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$this->view->mkdir( $dirPath );
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}
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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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// If there's no record for this user's encryption preferences
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if ( false === $this->recoveryEnabledForUser() ) {
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// create database configuration
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$sql = 'INSERT INTO `*PREFIX*encryption` (`uid`,`mode`,`recovery`) VALUES (?,?,?)';
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$args = array( $this->userId, 'server-side', 0);
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$query = \OCP\DB::prepare( $sql );
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$query->execute( $args );
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}
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return true;
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}
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/**
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* @brief Check whether pwd recovery is enabled for a given user
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* @return 1 = yes, 0 = no, false = no record
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* @note If records are not being returned, check for a hidden space
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* at the start of the uid in db
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*/
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public function recoveryEnabledForUser() {
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$sql = 'SELECT
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recovery
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FROM
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`*PREFIX*encryption`
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WHERE
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uid = ?';
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$args = array( $this->userId );
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$query = \OCP\DB::prepare( $sql );
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$result = $query->execute( $args );
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$recoveryEnabled = array();
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while( $row = $result->fetchRow() ) {
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$recoveryEnabled[] = $row['recovery'];
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}
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// If no record is found
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if ( empty( $recoveryEnabled ) ) {
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return false;
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// If a record is found
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} else {
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return $recoveryEnabled[0];
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}
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}
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/**
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* @brief Enable / disable pwd recovery for a given user
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* @param bool $enabled Whether to enable or disable recovery
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* @return bool
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*/
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public function setRecoveryForUser( $enabled ) {
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$recoveryStatus = $this->recoveryEnabledForUser();
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// If a record for this user already exists, update it
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if ( false === $recoveryStatus ) {
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$sql = 'INSERT INTO `*PREFIX*encryption`
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(`uid`,`mode`,`recovery`)
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VALUES (?,?,?)';
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$args = array( $this->userId, 'server-side', $enabled );
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// Create a new record instead
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} else {
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$sql = 'UPDATE
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*PREFIX*encryption
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SET
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recovery = ?
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WHERE
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uid = ?';
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$args = array( $enabled, $this->userId );
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}
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$query = \OCP\DB::prepare( $sql );
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if ( $query->execute( $args ) ) {
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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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/**
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* @brief Find all files and their encryption status within a directory
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* @param string $directory The path of the parent directory to search
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* @return mixed false if 0 found, array on success. Keys: name, path
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* @note $directory needs to be a path relative to OC data dir. e.g.
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* /admin/files NOT /backup OR /home/www/oc/data/admin/files
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*/
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public function findEncFiles( $directory ) {
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// Disable proxy - we don't want files to be decrypted before
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// we handle them
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\OC_FileProxy::$enabled = false;
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$found = array( 'plain' => array(), 'encrypted' => array(), 'legacy' => array() );
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if (
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$this->view->is_dir( $directory )
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&& $handle = $this->view->opendir( $directory )
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) {
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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( '/' . $file );
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$relPath = $this->stripUserFilesPath( $filePath );
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// If the path is a directory, search
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// its contents
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if ( $this->view->is_dir( $filePath ) ) {
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$this->findEncFiles( $filePath );
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// If the path is a file, determine
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// its encryption status
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} elseif ( $this->view->is_file( $filePath ) ) {
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// Disable proxies again, some-
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// where they got re-enabled :/
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\OC_FileProxy::$enabled = false;
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$data = $this->view->file_get_contents( $filePath );
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// If the file is encrypted
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// NOTE: If the userId is
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// empty or not set, file will
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// detected as plain
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// NOTE: This is inefficient;
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// scanning every file like this
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// will eat server resources :(
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if (
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Keymanager::getFileKey( $this->view, $this->userId, $relPath )
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&& Crypt::isCatfileContent( $data )
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) {
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$found['encrypted'][] = array( 'name' => $file, 'path' => $filePath );
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|
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// If the file uses old
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// encryption system
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} elseif ( Crypt::isLegacyEncryptedContent( $this->tail( $filePath, 3 ), $relPath ) ) {
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$found['legacy'][] = array( 'name' => $file, 'path' => $filePath );
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// If the file is not encrypted
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} else {
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||
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$found['plain'][] = array( 'name' => $file, 'path' => $relPath );
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}
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}
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}
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||
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}
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||
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\OC_FileProxy::$enabled = true;
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||
|
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if ( empty( $found ) ) {
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return false;
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||
|
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} else {
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||
|
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return $found;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
\OC_FileProxy::$enabled = true;
|
||
|
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return false;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Fetch the last lines of a file efficiently
|
||
* @note Safe to use on large files; does not read entire file to memory
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* @note Derivative of http://tekkie.flashbit.net/php/tail-functionality-in-php
|
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*/
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public function tail( $filename, $numLines ) {
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\OC_FileProxy::$enabled = false;
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$text = '';
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$pos = -1;
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$handle = $this->view->fopen( $filename, 'r' );
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while ( $numLines > 0 ) {
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--$pos;
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if( fseek( $handle, $pos, SEEK_END ) !== 0 ) {
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rewind( $handle );
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$numLines = 0;
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||
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} elseif ( fgetc( $handle ) === "\n" ) {
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--$numLines;
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|
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}
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||
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$block_size = ( -$pos ) % 8192;
|
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if ( $block_size === 0 || $numLines === 0 ) {
|
||
|
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$text = fread( $handle, ( $block_size === 0 ? 8192 : $block_size ) ) . $text;
|
||
|
||
}
|
||
}
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||
|
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fclose( $handle );
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||
|
||
\OC_FileProxy::$enabled = true;
|
||
|
||
return $text;
|
||
}
|
||
|
||
/**
|
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* @brief Check if a given path identifies an encrypted file
|
||
* @return true / false
|
||
*/
|
||
public function isEncryptedPath( $path ) {
|
||
|
||
// Disable encryption proxy so data retreived is in its
|
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// original form
|
||
\OC_FileProxy::$enabled = false;
|
||
|
||
$data = $this->view->file_get_contents( $path );
|
||
|
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\OC_FileProxy::$enabled = true;
|
||
|
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return Crypt::isCatfileContent( $data );
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief get the file size of the unencrypted file
|
||
* @param $path absolute path
|
||
* @return bool
|
||
*/
|
||
|
||
public function getFileSize( $path ) {
|
||
|
||
$result = 0;
|
||
|
||
// Disable encryption proxy to prevent recursive calls
|
||
$proxyStatus = \OC_FileProxy::$enabled;
|
||
\OC_FileProxy::$enabled = false;
|
||
|
||
// Reformat path for use with OC_FSV
|
||
$pathSplit = explode( '/', $path );
|
||
$pathRelative = implode( '/', array_slice( $pathSplit, 3 ) );
|
||
|
||
if ($pathSplit[2] == 'files' && $this->view->file_exists($path) && $this->isEncryptedPath($path)) {
|
||
|
||
// get the size from filesystem
|
||
$fullPath = $this->view->getLocalFile($path);
|
||
$size = filesize($fullPath);
|
||
|
||
// calculate last chunk nr
|
||
$lastChunckNr = floor($size / 8192);
|
||
|
||
// open stream
|
||
$stream = fopen('crypt://' . $pathRelative, "r");
|
||
|
||
if(is_resource($stream)) {
|
||
// calculate last chunk position
|
||
$lastChunckPos = ($lastChunckNr * 8192);
|
||
|
||
// seek to end
|
||
fseek($stream, $lastChunckPos);
|
||
|
||
// get the content of the last chunk
|
||
$lastChunkContent = fread($stream, 8192);
|
||
|
||
// calc the real file size with the size of the last chunk
|
||
$realSize = (($lastChunckNr * 6126) + strlen($lastChunkContent));
|
||
|
||
// store file size
|
||
$result = $realSize;
|
||
}
|
||
}
|
||
|
||
\OC_FileProxy::$enabled = $proxyStatus;
|
||
|
||
return $result;
|
||
}
|
||
|
||
/**
|
||
* @brief fix the file size of the encrypted file
|
||
* @param $path absolute path
|
||
* @return true / false if file is encrypted
|
||
*/
|
||
|
||
public function fixFileSize( $path ) {
|
||
|
||
$result = false;
|
||
|
||
// Disable encryption proxy to prevent recursive calls
|
||
$proxyStatus = \OC_FileProxy::$enabled;
|
||
\OC_FileProxy::$enabled = false;
|
||
|
||
$realSize = $this->getFileSize( $path );
|
||
|
||
if ( $realSize > 0 ) {
|
||
|
||
$cached = $this->view->getFileInfo( $path );
|
||
$cached['encrypted'] = 1;
|
||
|
||
// set the size
|
||
$cached['unencrypted_size'] = $realSize;
|
||
|
||
// put file info
|
||
$this->view->putFileInfo( $path, $cached );
|
||
|
||
$result = true;
|
||
|
||
}
|
||
|
||
\OC_FileProxy::$enabled = $proxyStatus;
|
||
|
||
return $result;
|
||
}
|
||
|
||
/**
|
||
* @brief Format a path to be relative to the /user/files/ directory
|
||
* @note e.g. turns '/admin/files/test.txt' into 'test.txt'
|
||
*/
|
||
public function stripUserFilesPath( $path ) {
|
||
|
||
$trimmed = ltrim( $path, '/' );
|
||
$split = explode( '/', $trimmed );
|
||
$sliced = array_slice( $split, 2 );
|
||
$relPath = implode( '/', $sliced );
|
||
|
||
return $relPath;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Format a path to be relative to the /user directory
|
||
* @note e.g. turns '/admin/files/test.txt' into 'files/test.txt'
|
||
*/
|
||
public function stripFilesPath( $path ) {
|
||
|
||
$trimmed = ltrim( $path, '/' );
|
||
$split = explode( '/', $trimmed );
|
||
$sliced = array_slice( $split, 1 );
|
||
$relPath = implode( '/', $sliced );
|
||
|
||
return $relPath;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Format a shared path to be relative to the /user/files/ directory
|
||
* @note Expects a path like /uid/files/Shared/filepath
|
||
*/
|
||
public function stripSharedFilePath( $path ) {
|
||
|
||
$trimmed = ltrim( $path, '/' );
|
||
$split = explode( '/', $trimmed );
|
||
$sliced = array_slice( $split, 3 );
|
||
$relPath = implode( '/', $sliced );
|
||
|
||
return $relPath;
|
||
|
||
}
|
||
|
||
public function isSharedPath( $path ) {
|
||
|
||
$trimmed = ltrim( $path, '/' );
|
||
$split = explode( '/', $trimmed );
|
||
|
||
if ( $split[2] == "Shared" ) {
|
||
|
||
return true;
|
||
|
||
} else {
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Encrypt all files in a directory
|
||
* @param string $publicKey the public key to encrypt files with
|
||
* @param string $dirPath the directory whose files will be encrypted
|
||
* @note Encryption is recursive
|
||
*/
|
||
public function encryptAll( $publicKey, $dirPath, $legacyPassphrase = null, $newPassphrase = null ) {
|
||
|
||
if ( $found = $this->findEncFiles( $dirPath ) ) {
|
||
|
||
// Disable proxy to prevent file being encrypted twice
|
||
\OC_FileProxy::$enabled = false;
|
||
|
||
// Encrypt unencrypted files
|
||
foreach ( $found['plain'] as $plainFile ) {
|
||
|
||
//relative to data/<user>/file
|
||
$relPath = $plainFile['path'];
|
||
|
||
//relative to /data
|
||
$rawPath = $this->userId . '/files/' . $plainFile['path'];
|
||
|
||
// Open plain file handle for binary reading
|
||
$plainHandle1 = $this->view->fopen( $rawPath, 'rb' );
|
||
|
||
// 2nd handle for moving plain file - view->rename() doesn't work, this is a workaround
|
||
$plainHandle2 = $this->view->fopen( $rawPath . '.plaintmp', 'wb' );
|
||
|
||
// Move plain file to a temporary location
|
||
stream_copy_to_stream( $plainHandle1, $plainHandle2 );
|
||
|
||
// Close access to original file
|
||
// $this->view->fclose( $plainHandle1 ); // not implemented in view{}
|
||
|
||
// Delete original plain file so we can rename enc file later
|
||
$this->view->unlink( $rawPath );
|
||
|
||
// Open enc file handle for binary writing, with same filename as original plain file
|
||
$encHandle = fopen( 'crypt://' . $relPath, 'wb' );
|
||
|
||
// Save data from plain stream to new encrypted file via enc stream
|
||
// NOTE: Stream{} will be invoked for handling
|
||
// the encryption, and should handle all keys
|
||
// and their generation etc. automatically
|
||
$size = stream_copy_to_stream( $plainHandle2, $encHandle );
|
||
|
||
// Delete temporary plain copy of file
|
||
$this->view->unlink( $rawPath . '.plaintmp' );
|
||
|
||
// Add the file to the cache
|
||
\OC\Files\Filesystem::putFileInfo( $plainFile['path'], array( 'encrypted'=>true, 'size' => $size ), '' );
|
||
|
||
}
|
||
|
||
// Encrypt legacy encrypted files
|
||
if (
|
||
! empty( $legacyPassphrase )
|
||
&& ! empty( $newPassphrase )
|
||
) {
|
||
|
||
foreach ( $found['legacy'] as $legacyFile ) {
|
||
|
||
// Fetch data from file
|
||
$legacyData = $this->view->file_get_contents( $legacyFile['path'] );
|
||
|
||
// Recrypt data, generate catfile
|
||
$recrypted = Crypt::legacyKeyRecryptKeyfile( $legacyData, $legacyPassphrase, $publicKey, $newPassphrase );
|
||
|
||
$relPath = $legacyFile['path'];
|
||
$rawPath = $this->userId . '/files/' . $plainFile['path'];
|
||
|
||
// Save keyfile
|
||
Keymanager::setFileKey( $this->view, $relPath, $this->userId, $recrypted['key'] );
|
||
|
||
// Overwrite the existing file with the encrypted one
|
||
$this->view->file_put_contents( $rawPath, $recrypted['data'] );
|
||
|
||
$size = strlen( $recrypted['data'] );
|
||
|
||
// Add the file to the cache
|
||
\OC\Files\Filesystem::putFileInfo( $rawPath, array( 'encrypted'=>true, 'size' => $size ), '' );
|
||
|
||
}
|
||
|
||
}
|
||
|
||
\OC_FileProxy::$enabled = true;
|
||
|
||
// If files were found, return true
|
||
return true;
|
||
|
||
} else {
|
||
|
||
// If no files were found, return false
|
||
return false;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Return important encryption related paths
|
||
* @param string $pathName Name of the directory to return the path of
|
||
* @return string path
|
||
*/
|
||
public function getPath( $pathName ) {
|
||
|
||
switch ( $pathName ) {
|
||
|
||
case 'publicKeyDir':
|
||
|
||
return $this->publicKeyDir;
|
||
|
||
break;
|
||
|
||
case 'encryptionDir':
|
||
|
||
return $this->encryptionDir;
|
||
|
||
break;
|
||
|
||
case 'keyfilesPath':
|
||
|
||
return $this->keyfilesPath;
|
||
|
||
break;
|
||
|
||
case 'publicKeyPath':
|
||
|
||
return $this->publicKeyPath;
|
||
|
||
break;
|
||
|
||
case 'privateKeyPath':
|
||
|
||
return $this->privateKeyPath;
|
||
|
||
break;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief get path of a file.
|
||
* @param $fileId id of the file
|
||
* @return path of the file
|
||
*/
|
||
public static function fileIdToPath( $fileId ) {
|
||
|
||
$query = \OC_DB::prepare( 'SELECT `path`'
|
||
.' FROM `*PREFIX*filecache`'
|
||
.' WHERE `fileid` = ?' );
|
||
|
||
$result = $query->execute( array( $fileId ) );
|
||
|
||
$row = $result->fetchRow();
|
||
|
||
return substr( $row['path'], 5 );
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Filter an array of UIDs to return only ones ready for sharing
|
||
* @param array $unfilteredUsers users to be checked for sharing readiness
|
||
* @return multi-dimensional array. keys: ready, unready
|
||
*/
|
||
public function filterShareReadyUsers( $unfilteredUsers ) {
|
||
|
||
// This array will collect the filtered IDs
|
||
$readyIds = $unreadyIds = array();
|
||
|
||
// Loop through users and create array of UIDs that need new keyfiles
|
||
foreach ( $unfilteredUsers as $user ) {
|
||
|
||
$util = new Util( $this->view, $user );
|
||
|
||
// Check that the user is encryption capable, or is the
|
||
// public system user 'ownCloud' (for public shares)
|
||
if (
|
||
$user == 'owncloud'
|
||
or $util->ready()
|
||
) {
|
||
|
||
// Construct array of ready UIDs for Keymanager{}
|
||
$readyIds[] = $user;
|
||
|
||
} else {
|
||
|
||
// Construct array of unready UIDs for Keymanager{}
|
||
$unreadyIds[] = $user;
|
||
|
||
// Log warning; we can't do necessary setup here
|
||
// because we don't have the user passphrase
|
||
\OC_Log::write( 'Encryption library', '"'.$user.'" is not setup for encryption', \OC_Log::WARN );
|
||
|
||
}
|
||
|
||
}
|
||
|
||
return array (
|
||
'ready' => $readyIds
|
||
, 'unready' => $unreadyIds
|
||
);
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Decrypt a keyfile without knowing how it was encrypted
|
||
* @param string $filePath
|
||
* @param string $fileOwner
|
||
* @param string $privateKey
|
||
* @note Checks whether file was encrypted with openssl_seal or
|
||
* openssl_encrypt, and decrypts accrdingly
|
||
* @note This was used when 2 types of encryption for keyfiles was used,
|
||
* but now we've switched to exclusively using openssl_seal()
|
||
*/
|
||
public function decryptUnknownKeyfile( $filePath, $fileOwner, $privateKey ) {
|
||
|
||
// Get the encrypted keyfile
|
||
// NOTE: the keyfile format depends on how it was encrypted! At
|
||
// this stage we don't know how it was encrypted
|
||
$encKeyfile = Keymanager::getFileKey( $this->view, $this->userId, $filePath );
|
||
|
||
// We need to decrypt the keyfile
|
||
// Has the file been shared yet?
|
||
if (
|
||
$this->userId == $fileOwner
|
||
&& ! Keymanager::getShareKey( $this->view, $this->userId, $filePath ) // NOTE: we can't use isShared() here because it's a post share hook so it always returns true
|
||
) {
|
||
|
||
// The file has no shareKey, and its keyfile must be
|
||
// decrypted conventionally
|
||
$plainKeyfile = Crypt::keyDecrypt( $encKeyfile, $privateKey );
|
||
|
||
|
||
} else {
|
||
|
||
// The file has a shareKey and must use it for decryption
|
||
$shareKey = Keymanager::getShareKey( $this->view, $this->userId, $filePath );
|
||
|
||
$plainKeyfile = Crypt::multiKeyDecrypt( $encKeyfile, $shareKey, $privateKey );
|
||
|
||
}
|
||
|
||
return $plainKeyfile;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Encrypt keyfile to multiple users
|
||
* @param array $users list of users which should be able to access the file
|
||
* @param string $filePath path of the file to be shared
|
||
* @return bool
|
||
*/
|
||
public function setSharedFileKeyfiles( Session $session, array $users, $filePath ) {
|
||
|
||
// Make sure users are capable of sharing
|
||
$filteredUids = $this->filterShareReadyUsers( $users );
|
||
|
||
// If we're attempting to share to unready users
|
||
if ( ! empty( $filteredUids['unready'] ) ) {
|
||
|
||
\OC_Log::write( 'Encryption library', 'Sharing to these user(s) failed as they are unready for encryption:"'.print_r( $filteredUids['unready'], 1 ), \OC_Log::WARN );
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
// Get public keys for each user, ready for generating sharekeys
|
||
$userPubKeys = Keymanager::getPublicKeys( $this->view, $filteredUids['ready'] );
|
||
|
||
// Note proxy status then disable it
|
||
$proxyStatus = \OC_FileProxy::$enabled;
|
||
\OC_FileProxy::$enabled = false;
|
||
|
||
// Get the current users's private key for decrypting existing keyfile
|
||
$privateKey = $session->getPrivateKey();
|
||
|
||
$fileOwner = \OC\Files\Filesystem::getOwner( $filePath );
|
||
|
||
// Decrypt keyfile
|
||
$plainKeyfile = $this->decryptUnknownKeyfile( $filePath, $fileOwner, $privateKey );
|
||
|
||
// Re-enc keyfile to (additional) sharekeys
|
||
$multiEncKey = Crypt::multiKeyEncrypt( $plainKeyfile, $userPubKeys );
|
||
|
||
// Save the recrypted key to it's owner's keyfiles directory
|
||
// Save new sharekeys to all necessary user directory
|
||
if (
|
||
! Keymanager::setFileKey( $this->view, $filePath, $fileOwner, $multiEncKey['data'] )
|
||
|| ! Keymanager::setShareKeys( $this->view, $filePath, $multiEncKey['keys'] )
|
||
) {
|
||
|
||
\OC_Log::write( 'Encryption library', 'Keyfiles could not be saved for users sharing ' . $filePath, \OC_Log::ERROR );
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
// Return proxy to original status
|
||
\OC_FileProxy::$enabled = $proxyStatus;
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* @brief Find, sanitise and format users sharing a file
|
||
* @note This wraps other methods into a portable bundle
|
||
*/
|
||
public function getSharingUsersArray( $sharingEnabled, $filePath, $currentUserId = false ) {
|
||
|
||
// Check if key recovery is enabled
|
||
if (
|
||
\OC_Appconfig::getValue( 'files_encryption', 'recoveryAdminEnabled' )
|
||
&& $this->recoveryEnabledForUser()
|
||
) {
|
||
|
||
$recoveryEnabled = true;
|
||
|
||
} else {
|
||
|
||
$recoveryEnabled = false;
|
||
|
||
}
|
||
|
||
// Make sure that a share key is generated for the owner too
|
||
list( $owner, $ownerPath ) = $this->getUidAndFilename( $filePath );
|
||
|
||
if ( $sharingEnabled ) {
|
||
|
||
// Find out who, if anyone, is sharing the file
|
||
$userIds = \OCP\Share::getUsersSharingFile( $ownerPath, $owner,true, true, true );
|
||
|
||
}
|
||
|
||
// If recovery is enabled, add the
|
||
// Admin UID to list of users to share to
|
||
if ( $recoveryEnabled ) {
|
||
|
||
// Find recoveryAdmin user ID
|
||
$recoveryAdminUid = \OC_Appconfig::getValue( 'files_encryption', 'recoveryAdminUid' );
|
||
|
||
// Add recoveryAdmin to list of users sharing
|
||
$userIds[] = $recoveryAdminUid;
|
||
|
||
}
|
||
|
||
// add current user if given
|
||
if ( $currentUserId != false ) {
|
||
|
||
$userIds[] = $currentUserId;
|
||
|
||
}
|
||
|
||
// Remove duplicate UIDs
|
||
$uniqueUserIds = array_unique ( $userIds );
|
||
|
||
return $uniqueUserIds;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Set file migration status for user
|
||
* @return bool
|
||
*/
|
||
public function setMigrationStatus( $status ) {
|
||
|
||
$sql = 'UPDATE
|
||
*PREFIX*encryption
|
||
SET
|
||
migrationStatus = ?
|
||
WHERE
|
||
uid = ?';
|
||
|
||
$args = array( $status, $this->userId );
|
||
|
||
$query = \OCP\DB::prepare( $sql );
|
||
|
||
if ( $query->execute( $args ) ) {
|
||
|
||
return true;
|
||
|
||
} else {
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief Check whether pwd recovery is enabled for a given user
|
||
* @return 1 = yes, 0 = no, false = no record
|
||
* @note If records are not being returned, check for a hidden space
|
||
* at the start of the uid in db
|
||
*/
|
||
public function getMigrationStatus() {
|
||
|
||
$sql = 'SELECT
|
||
migrationStatus
|
||
FROM
|
||
`*PREFIX*encryption`
|
||
WHERE
|
||
uid = ?';
|
||
|
||
$args = array( $this->userId );
|
||
|
||
$query = \OCP\DB::prepare( $sql );
|
||
|
||
$result = $query->execute( $args );
|
||
|
||
$migrationStatus = array();
|
||
|
||
while( $row = $result->fetchRow() ) {
|
||
|
||
$migrationStatus[] = $row['migrationStatus'];
|
||
|
||
}
|
||
|
||
// If no record is found
|
||
if ( empty( $migrationStatus ) ) {
|
||
|
||
return false;
|
||
|
||
// If a record is found
|
||
} else {
|
||
|
||
return $migrationStatus[0];
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief get uid of the owners of the file and the path to the file
|
||
* @param $path Path of the file to check
|
||
* @note $shareFilePath must be relative to data/UID/files. Files
|
||
* relative to /Shared are also acceptable
|
||
* @return array
|
||
*/
|
||
public function getUidAndFilename( $path ) {
|
||
|
||
$view = new \OC\Files\View($this->userFilesDir);
|
||
$fileOwnerUid = $view->getOwner( $path );
|
||
|
||
// Check that UID is valid
|
||
if ( ! \OCP\User::userExists( $fileOwnerUid ) ) {
|
||
|
||
throw new \Exception( 'Could not find owner (UID = "' . var_export( $fileOwnerUid, 1 ) . '") of file "' . $path . '"' );
|
||
|
||
}
|
||
|
||
// NOTE: Bah, this dependency should be elsewhere
|
||
\OC\Files\Filesystem::initMountPoints( $fileOwnerUid );
|
||
|
||
// If the file owner is the currently logged in user
|
||
if ( $fileOwnerUid == $this->userId ) {
|
||
|
||
// Assume the path supplied is correct
|
||
$filename = $path;
|
||
|
||
} else {
|
||
|
||
$info = $view->getFileInfo( $path );
|
||
$ownerView = new \OC\Files\View( '/' . $fileOwnerUid . '/files' );
|
||
|
||
// Fetch real file path from DB
|
||
$filename = $ownerView->getPath( $info['fileid'] ); // TODO: Check that this returns a path without including the user data dir
|
||
|
||
}
|
||
|
||
// Make path relative for use by $view
|
||
$relpath = \OC\Files\Filesystem::normalizePath($fileOwnerUid . '/' . $this->fileFolderName . '/' . $filename);
|
||
|
||
// Check that the filename we're using is working
|
||
if ( $this->view->file_exists( $relpath ) ) {
|
||
|
||
return array ( $fileOwnerUid, $filename );
|
||
|
||
} else {
|
||
|
||
return false;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief geo recursively through a dir and collect all files and sub files.
|
||
* @param type $dir relative to the users files folder
|
||
* @return array with list of files relative to the users files folder
|
||
*/
|
||
public function getAllFiles( $dir ) {
|
||
|
||
$result = array();
|
||
|
||
$content = $this->view->getDirectoryContent( $this->userFilesDir . $dir );
|
||
|
||
// handling for re shared folders
|
||
$path_split = explode( '/', $dir );
|
||
$shared = '';
|
||
|
||
if( $path_split[1] === 'Shared' ) {
|
||
|
||
$shared = '/Shared';
|
||
|
||
}
|
||
|
||
foreach ( $content as $c ) {
|
||
|
||
$sharedPart = $path_split[sizeof( $path_split )-1];
|
||
$targetPathSplit = array_reverse( explode( '/', $c['path'] ) );
|
||
|
||
$path = '';
|
||
|
||
// rebuild path
|
||
foreach ( $targetPathSplit as $pathPart ) {
|
||
|
||
if ( $pathPart !== $sharedPart ) {
|
||
|
||
$path = '/' . $pathPart . $path;
|
||
|
||
} else {
|
||
|
||
break;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
$path = $dir.$path;
|
||
|
||
if ($c['type'] === "dir" ) {
|
||
|
||
$result = array_merge( $result, $this->getAllFiles( $path ) );
|
||
|
||
} else {
|
||
|
||
$result[] = $path;
|
||
|
||
}
|
||
}
|
||
|
||
return $result;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief get shares parent.
|
||
* @param int $id of the current share
|
||
* @return array of the parent
|
||
*/
|
||
public static function getShareParent( $id ) {
|
||
|
||
$query = \OC_DB::prepare( 'SELECT `file_target`, `item_type`'
|
||
.' FROM `*PREFIX*share`'
|
||
.' WHERE `id` = ?' );
|
||
|
||
$result = $query->execute( array( $id ) );
|
||
|
||
$row = $result->fetchRow();
|
||
|
||
return $row;
|
||
|
||
}
|
||
|
||
/**
|
||
* @brief get owner of the shared files.
|
||
* @param int $Id of a share
|
||
* @return owner
|
||
*/
|
||
public function getOwnerFromSharedFile( $id ) {
|
||
|
||
$query = \OC_DB::prepare( 'SELECT `parent`, `uid_owner` FROM `*PREFIX*share` WHERE `id` = ?', 1 );
|
||
$source = $query->execute( array( $id ) )->fetchRow();
|
||
|
||
if ( isset($source['parent'] ) ) {
|
||
|
||
$parent = $source['parent'];
|
||
|
||
while ( isset( $parent ) ) {
|
||
|
||
$query = \OC_DB::prepare( 'SELECT `parent`, `uid_owner` FROM `*PREFIX*share` WHERE `id` = ?', 1 );
|
||
$item = $query->execute( array( $parent ) )->fetchRow();
|
||
|
||
if ( isset( $item['parent'] ) ) {
|
||
|
||
$parent = $item['parent'];
|
||
|
||
} else {
|
||
|
||
$fileOwner = $item['uid_owner'];
|
||
|
||
break;
|
||
|
||
}
|
||
}
|
||
|
||
} else {
|
||
|
||
$fileOwner = $source['uid_owner'];
|
||
|
||
}
|
||
|
||
return $fileOwner;
|
||
|
||
}
|
||
|
||
}
|