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560 lines
15 KiB
PHP
560 lines
15 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Bjoern Schiessle
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* @copyright 2012 Bjoern Schiessle <schiessle@owncloud.com>
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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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namespace OCA\Encryption;
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/**
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* Class to manage storage and retrieval of encryption keys
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* @note Where a method requires a view object, it's root must be '/'
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*/
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class Keymanager {
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/**
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* retrieve the ENCRYPTED private key from a user
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*
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* @param \OC\Files\View $view
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* @param string $user
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* @return string private key or false (hopefully)
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* @note the key returned by this method must be decrypted before use
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*/
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public static function getPrivateKey(\OC\Files\View $view, $user) {
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$path = '/' . $user . '/' . 'files_encryption' . '/' . $user . '.private.key';
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$key = false;
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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if ($view->file_exists($path)) {
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$key = $view->file_get_contents($path);
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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return $key;
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}
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/**
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* retrieve public key for a specified user
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* @param \OC\Files\View $view
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* @param string $userId
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* @return string public key or false
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*/
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public static function getPublicKey(\OC\Files\View $view, $userId) {
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$result = $view->file_get_contents('/public-keys/' . $userId . '.public.key');
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
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* Retrieve a user's public and private key
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* @param \OC\Files\View $view
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* @param string $userId
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* @return array keys: privateKey, publicKey
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*/
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public static function getUserKeys(\OC\Files\View $view, $userId) {
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return array(
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'publicKey' => self::getPublicKey($view, $userId),
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'privateKey' => self::getPrivateKey($view, $userId)
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);
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}
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/**
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* Retrieve public keys for given users
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* @param \OC\Files\View $view
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* @param array $userIds
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* @return array of public keys for the specified users
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*/
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public static function getPublicKeys(\OC\Files\View $view, array $userIds) {
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$keys = array();
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foreach ($userIds as $userId) {
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$keys[$userId] = self::getPublicKey($view, $userId);
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}
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return $keys;
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}
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/**
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* store file encryption key
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*
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* @param \OC\Files\View $view
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* @param \OCA\Encryption\Util $util
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* @param string $path relative path of the file, including filename
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* @param string $catfile keyfile content
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* @return bool true/false
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* @note The keyfile is not encrypted here. Client code must
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* asymmetrically encrypt the keyfile before passing it to this method
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*/
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public static function setFileKey(\OC\Files\View $view, $util, $path, $catfile) {
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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list($owner, $filename) = $util->getUidAndFilename($path);
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// in case of system wide mount points the keys are stored directly in the data directory
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if ($util->isSystemWideMountPoint($filename)) {
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$basePath = '/files_encryption/keyfiles';
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} else {
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$basePath = '/' . $owner . '/files_encryption/keyfiles';
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}
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$targetPath = self::keySetPreparation($view, $filename, $basePath, $owner);
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if (!$view->is_dir($basePath . '/' . $targetPath)) {
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// create all parent folders
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$info = pathinfo($basePath . '/' . $targetPath);
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$keyfileFolderName = $view->getLocalFolder($info['dirname']);
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if (!file_exists($keyfileFolderName)) {
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mkdir($keyfileFolderName, 0750, true);
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}
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}
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// try reusing key file if part file
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if (Helper::isPartialFilePath($targetPath)) {
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$result = $view->file_put_contents(
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$basePath . '/' . Helper::stripPartialFileExtension($targetPath) . '.key', $catfile);
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} else {
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$result = $view->file_put_contents($basePath . '/' . $targetPath . '.key', $catfile);
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
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* retrieve keyfile for an encrypted file
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* @param \OC\Files\View $view
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* @param \OCA\Encryption\Util $util
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* @param string|false $filePath
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* @internal param \OCA\Encryption\file $string name
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* @return string file key or false
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* @note The keyfile returned is asymmetrically encrypted. Decryption
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* of the keyfile must be performed by client code
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*/
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public static function getFileKey($view, $util, $filePath) {
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list($owner, $filename) = $util->getUidAndFilename($filePath);
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$filename = Helper::stripPartialFileExtension($filename);
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$filePath_f = ltrim($filename, '/');
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// in case of system wide mount points the keys are stored directly in the data directory
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if ($util->isSystemWideMountPoint($filename)) {
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$keyfilePath = '/files_encryption/keyfiles/' . $filePath_f . '.key';
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} else {
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$keyfilePath = '/' . $owner . '/files_encryption/keyfiles/' . $filePath_f . '.key';
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}
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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if ($view->file_exists($keyfilePath)) {
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$result = $view->file_get_contents($keyfilePath);
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} else {
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$result = false;
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
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* Delete a keyfile
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*
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* @param \OC\Files\View $view
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* @param string $path path of the file the key belongs to
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* @param string $userId the user to whom the file belongs
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* @return bool Outcome of unlink operation
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* @note $path must be relative to data/user/files. e.g. mydoc.txt NOT
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* /data/admin/files/mydoc.txt
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*/
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public static function deleteFileKey($view, $path, $userId=null) {
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$trimmed = ltrim($path, '/');
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if ($trimmed === '') {
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\OCP\Util::writeLog('Encryption library',
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'Can\'t delete file-key empty path given!', \OCP\Util::ERROR);
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return false;
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}
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if ($userId === null) {
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$userId = Helper::getUser($path);
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}
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$util = new Util($view, $userId);
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if($util->isSystemWideMountPoint($path)) {
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$keyPath = '/files_encryption/keyfiles/' . $trimmed;
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} else {
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$keyPath = '/' . $userId . '/files_encryption/keyfiles/' . $trimmed;
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}
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$result = false;
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if ($view->is_dir($keyPath)) {
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$result = $view->unlink($keyPath);
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} else {
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if ($view->file_exists($keyPath . '.key')) {
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$result = $view->unlink($keyPath . '.key');
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}
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}
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if (!$result) {
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\OCP\Util::writeLog('Encryption library',
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'Could not delete keyfile; does not exist: "' . $keyPath, \OCP\Util::ERROR);
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}
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return $result;
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}
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/**
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* store private key from the user
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* @param string $key
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* @return bool
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* @note Encryption of the private key must be performed by client code
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* as no encryption takes place here
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*/
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public static function setPrivateKey($key) {
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$user = \OCP\User::getUser();
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$view = new \OC\Files\View('/' . $user . '/files_encryption');
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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if (!$view->file_exists(''))
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$view->mkdir('');
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$result = $view->file_put_contents($user . '.private.key', $key);
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
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* store share key
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*
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* @param \OC\Files\View $view
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* @param string $path where the share key is stored
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* @param string $shareKey
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* @return bool true/false
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* @note The keyfile is not encrypted here. Client code must
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* asymmetrically encrypt the keyfile before passing it to this method
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*/
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private static function setShareKey(\OC\Files\View $view, $path, $shareKey) {
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$result = $view->file_put_contents($path, $shareKey);
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\OC_FileProxy::$enabled = $proxyStatus;
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if (is_int($result) && $result > 0) {
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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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* store multiple share keys for a single file
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* @param \OC\Files\View $view
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* @param \OCA\Encryption\Util $util
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* @param string $path
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* @param array $shareKeys
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* @return bool
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*/
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public static function setShareKeys(\OC\Files\View $view, $util, $path, array $shareKeys) {
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// $shareKeys must be an array with the following format:
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// [userId] => [encrypted key]
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list($owner, $filename) = $util->getUidAndFilename($path);
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// in case of system wide mount points the keys are stored directly in the data directory
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if ($util->isSystemWideMountPoint($filename)) {
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$basePath = '/files_encryption/share-keys';
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} else {
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$basePath = '/' . $owner . '/files_encryption/share-keys';
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}
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$shareKeyPath = self::keySetPreparation($view, $filename, $basePath, $owner);
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$result = true;
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foreach ($shareKeys as $userId => $shareKey) {
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// try reusing key file if part file
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if (Helper::isPartialFilePath($shareKeyPath)) {
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$writePath = $basePath . '/' . Helper::stripPartialFileExtension($shareKeyPath) . '.' . $userId . '.shareKey';
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} else {
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$writePath = $basePath . '/' . $shareKeyPath . '.' . $userId . '.shareKey';
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}
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if (!self::setShareKey($view, $writePath, $shareKey)) {
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// If any of the keys are not set, flag false
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$result = false;
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}
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}
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// Returns false if any of the keys weren't set
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return $result;
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}
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/**
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* retrieve shareKey for an encrypted file
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* @param \OC\Files\View $view
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* @param string $userId
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* @param \OCA\Encryption\Util $util
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* @param string $filePath
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* @return string file key or false
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* @note The sharekey returned is encrypted. Decryption
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* of the keyfile must be performed by client code
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*/
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public static function getShareKey(\OC\Files\View $view, $userId, $util, $filePath) {
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// try reusing key file if part file
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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list($owner, $filename) = $util->getUidAndFilename($filePath);
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$filename = Helper::stripPartialFileExtension($filename);
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// in case of system wide mount points the keys are stored directly in the data directory
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if ($util->isSystemWideMountPoint($filename)) {
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$shareKeyPath = '/files_encryption/share-keys/' . $filename . '.' . $userId . '.shareKey';
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} else {
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$shareKeyPath = '/' . $owner . '/files_encryption/share-keys/' . $filename . '.' . $userId . '.shareKey';
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}
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if ($view->file_exists($shareKeyPath)) {
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$result = $view->file_get_contents($shareKeyPath);
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} else {
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$result = false;
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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return $result;
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}
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/**
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* delete all share keys of a given file
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* @param \OC\Files\View $view
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* @param string $userId owner of the file
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* @param string $filePath path to the file, relative to the owners file dir
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*/
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public static function delAllShareKeys($view, $userId, $filePath) {
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$filePath = ltrim($filePath, '/');
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if ($filePath === '') {
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\OCP\Util::writeLog('Encryption library',
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'Can\'t delete share-keys empty path given!', \OCP\Util::ERROR);
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return false;
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}
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$util = new util($view, $userId);
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if ($util->isSystemWideMountPoint($filePath)) {
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$baseDir = '/files_encryption/share-keys/';
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} else {
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$baseDir = $userId . '/files_encryption/share-keys/';
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}
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if ($view->is_dir($baseDir . $filePath)) {
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$view->unlink($baseDir . $filePath);
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} else {
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$parentDir = dirname($baseDir . $filePath);
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$filename = pathinfo($filePath, PATHINFO_BASENAME);
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foreach($view->getDirectoryContent($parentDir) as $content) {
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$path = $content['path'];
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if (self::getFilenameFromShareKey($content['name']) === $filename) {
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$view->unlink('/' . $userId . '/' . $path);
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}
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}
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}
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}
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/**
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* Delete a single user's shareKey for a single file
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*/
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public static function delShareKey(\OC\Files\View $view, $userIds, $filePath) {
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$proxyStatus = \OC_FileProxy::$enabled;
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\OC_FileProxy::$enabled = false;
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$userId = Helper::getUser($filePath);
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$util = new Util($view, $userId);
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list($owner, $filename) = $util->getUidAndFilename($filePath);
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if ($util->isSystemWideMountPoint($filename)) {
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$shareKeyPath = \OC\Files\Filesystem::normalizePath('/files_encryption/share-keys/' . $filename);
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} else {
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$shareKeyPath = \OC\Files\Filesystem::normalizePath('/' . $owner . '/files_encryption/share-keys/' . $filename);
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}
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if ($view->is_dir($shareKeyPath)) {
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$localPath = \OC\Files\Filesystem::normalizePath($view->getLocalFolder($shareKeyPath));
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self::recursiveDelShareKeys($localPath, $userIds);
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} else {
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foreach ($userIds as $userId) {
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if (!$view->unlink($shareKeyPath . '.' . $userId . '.shareKey')) {
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\OCP\Util::writeLog('Encryption library',
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'Could not delete shareKey; does not exist: "' . $shareKeyPath . '.' . $userId
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. '.shareKey"', \OCP\Util::ERROR);
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}
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}
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}
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\OC_FileProxy::$enabled = $proxyStatus;
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}
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/**
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* recursively delete share keys from given users
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*
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* @param string $dir directory
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* @param array $userIds user ids for which the share keys should be deleted
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*/
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private static function recursiveDelShareKeys($dir, $userIds) {
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foreach ($userIds as $userId) {
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$extension = '.' . $userId . '.shareKey';
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$escapedDir = Helper::escapeGlobPattern($dir);
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$escapedExtension = Helper::escapeGlobPattern($extension);
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$matches = glob($escapedDir . '/*' . $escapedExtension);
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}
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/** @var $matches array */
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foreach ($matches as $ma) {
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if (!unlink($ma)) {
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\OCP\Util::writeLog('Encryption library',
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'Could not delete shareKey; does not exist: "' . $ma . '"', \OCP\Util::ERROR);
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}
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}
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$subdirs = $directories = glob($escapedDir . '/*', GLOB_ONLYDIR);
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foreach ($subdirs as $subdir) {
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self::recursiveDelShareKeys($subdir, $userIds);
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}
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}
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/**
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* Make preparations to vars and filesystem for saving a keyfile
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* @param string|boolean $path
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* @param string $basePath
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*/
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public static function keySetPreparation(\OC\Files\View $view, $path, $basePath, $userId) {
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$targetPath = ltrim($path, '/');
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$path_parts = pathinfo($targetPath);
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// If the file resides within a subdirectory, create it
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if (
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isset($path_parts['dirname'])
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&& !$view->file_exists($basePath . '/' . $path_parts['dirname'])
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) {
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$sub_dirs = explode(DIRECTORY_SEPARATOR, $basePath . '/' . $path_parts['dirname']);
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$dir = '';
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foreach ($sub_dirs as $sub_dir) {
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$dir .= '/' . $sub_dir;
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if (!$view->is_dir($dir)) {
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$view->mkdir($dir);
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}
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}
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}
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return $targetPath;
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}
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/**
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* extract filename from share key name
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* @param string $shareKey (filename.userid.sharekey)
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* @return string|false filename or false
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*/
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protected static function getFilenameFromShareKey($shareKey) {
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$parts = explode('.', $shareKey);
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$filename = false;
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if(count($parts) > 2) {
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$filename = implode('.', array_slice($parts, 0, count($parts)-2));
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}
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return $filename;
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}
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}
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