nextcloud/apps/files_encryption/lib/helper.php

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<?php
/**
* ownCloud
*
* @author Florin Peter
* @copyright 2013 Florin Peter <owncloud@florin-peter.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Encryption;
/**
* @brief Class to manage registration of hooks an various helper methods
* @package OCA\Encryption
*/
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class Helper {
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private static $tmpFileMapping; // Map tmp files to files in data/user/files
/**
* @brief register share related hooks
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*
*/
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public static function registerShareHooks() {
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\OCP\Util::connectHook('OCP\Share', 'pre_shared', 'OCA\Encryption\Hooks', 'preShared');
\OCP\Util::connectHook('OCP\Share', 'post_shared', 'OCA\Encryption\Hooks', 'postShared');
\OCP\Util::connectHook('OCP\Share', 'post_unshare', 'OCA\Encryption\Hooks', 'postUnshare');
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}
/**
* @brief register user related hooks
*
*/
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public static function registerUserHooks() {
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\OCP\Util::connectHook('OC_User', 'post_login', 'OCA\Encryption\Hooks', 'login');
\OCP\Util::connectHook('OC_User', 'post_setPassword', 'OCA\Encryption\Hooks', 'setPassphrase');
\OCP\Util::connectHook('OC_User', 'pre_setPassword', 'OCA\Encryption\Hooks', 'preSetPassphrase');
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\OCP\Util::connectHook('OC_User', 'post_createUser', 'OCA\Encryption\Hooks', 'postCreateUser');
\OCP\Util::connectHook('OC_User', 'post_deleteUser', 'OCA\Encryption\Hooks', 'postDeleteUser');
}
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/**
* @brief register filesystem related hooks
*
*/
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public static function registerFilesystemHooks() {
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\OCP\Util::connectHook('OC_Filesystem', 'rename', 'OCA\Encryption\Hooks', 'preRename');
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\OCP\Util::connectHook('OC_Filesystem', 'post_rename', 'OCA\Encryption\Hooks', 'postRename');
\OCP\Util::connectHook('OC_Filesystem', 'post_delete', 'OCA\Encryption\Hooks', 'postDelete');
\OCP\Util::connectHook('OC_Filesystem', 'delete', 'OCA\Encryption\Hooks', 'preDelete');
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}
/**
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* @brief register app management related hooks
*
*/
public static function registerAppHooks() {
\OCP\Util::connectHook('OC_App', 'pre_disable', 'OCA\Encryption\Hooks', 'preDisable');
\OCP\Util::connectHook('OC_App', 'post_disable', 'OCA\Encryption\Hooks', 'postEnable');
}
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/**
* @brief setup user for files_encryption
*
* @param Util $util
* @param string $password
* @return bool
*/
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public static function setupUser($util, $password) {
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// Check files_encryption infrastructure is ready for action
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if (!$util->ready()) {
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\OCP\Util::writeLog('Encryption library', 'User account "' . $util->getUserId()
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. '" is not ready for encryption; configuration started', \OCP\Util::DEBUG);
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if (!$util->setupServerSide($password)) {
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return false;
}
}
return true;
}
/**
* @brief enable recovery
*
* @param $recoveryKeyId
* @param string $recoveryPassword
* @internal param \OCA\Encryption\Util $util
* @internal param string $password
* @return bool
*/
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public static function adminEnableRecovery($recoveryKeyId, $recoveryPassword) {
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$view = new \OC\Files\View('/');
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$appConfig = \OC::$server->getAppConfig();
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if ($recoveryKeyId === null) {
$recoveryKeyId = 'recovery_' . substr(md5(time()), 0, 8);
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$appConfig->setValue('files_encryption', 'recoveryKeyId', $recoveryKeyId);
}
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if (!$view->is_dir('/owncloud_private_key')) {
$view->mkdir('/owncloud_private_key');
}
if (
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(!$view->file_exists("/public-keys/" . $recoveryKeyId . ".public.key")
|| !$view->file_exists("/owncloud_private_key/" . $recoveryKeyId . ".private.key"))
) {
$keypair = \OCA\Encryption\Crypt::createKeypair();
\OC_FileProxy::$enabled = false;
// Save public key
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if (!$view->is_dir('/public-keys')) {
$view->mkdir('/public-keys');
}
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$view->file_put_contents('/public-keys/' . $recoveryKeyId . '.public.key', $keypair['publicKey']);
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// Encrypt private key empty passphrase
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$encryptedPrivateKey = \OCA\Encryption\Crypt::symmetricEncryptFileContent($keypair['privateKey'], $recoveryPassword);
// Save private key
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$view->file_put_contents('/owncloud_private_key/' . $recoveryKeyId . '.private.key', $encryptedPrivateKey);
\OC_FileProxy::$enabled = true;
// Set recoveryAdmin as enabled
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$appConfig->setValue('files_encryption', 'recoveryAdminEnabled', 1);
$return = true;
} else { // get recovery key and check the password
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$util = new \OCA\Encryption\Util(new \OC_FilesystemView('/'), \OCP\User::getUser());
$return = $util->checkRecoveryPassword($recoveryPassword);
if ($return) {
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$appConfig->setValue('files_encryption', 'recoveryAdminEnabled', 1);
}
}
return $return;
}
/**
* @brief Check if a path is a .part file
* @param string $path Path that may identify a .part file
* @return bool
*/
public static function isPartialFilePath($path) {
$extension = pathinfo($path, PATHINFO_EXTENSION);
if ( $extension === 'part') {
return true;
} else {
return false;
}
}
/**
* @brief Remove .path extension from a file path
* @param string $path Path that may identify a .part file
* @return string File path without .part extension
* @note this is needed for reusing keys
*/
public static function stripPartialFileExtension($path) {
$extension = pathinfo($path, PATHINFO_EXTENSION);
if ( $extension === 'part') {
$newLength = strlen($path) - 5; // 5 = strlen(".part") = strlen(".etmp")
$fPath = substr($path, 0, $newLength);
// if path also contains a transaction id, we remove it too
$extension = pathinfo($fPath, PATHINFO_EXTENSION);
if(substr($extension, 0, 12) === 'ocTransferId') { // 12 = strlen("ocTransferId")
$newLength = strlen($fPath) - strlen($extension) -1;
$fPath = substr($fPath, 0, $newLength);
}
return $fPath;
} else {
return $path;
}
}
/**
* @brief disable recovery
*
* @param string $recoveryPassword
* @return bool
*/
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public static function adminDisableRecovery($recoveryPassword) {
$util = new Util(new \OC_FilesystemView('/'), \OCP\User::getUser());
$return = $util->checkRecoveryPassword($recoveryPassword);
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if ($return) {
// Set recoveryAdmin as disabled
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\OC::$server->getAppConfig()->setValue('files_encryption', 'recoveryAdminEnabled', 0);
}
return $return;
}
/**
* @brief checks if access is public/anonymous user
* @return bool
*/
public static function isPublicAccess() {
if (\OCP\User::getUser() === false) {
return true;
} else {
return false;
}
}
/**
* @brief Format a path to be relative to the /user/files/ directory
* @param string $path the absolute path
* @return string e.g. turns '/admin/files/test.txt' into 'test.txt'
*/
public static function stripUserFilesPath($path) {
$trimmed = ltrim($path, '/');
$split = explode('/', $trimmed);
// it is not a file relative to data/user/files
if (count($split) < 3 || $split[1] !== 'files') {
return false;
}
$sliced = array_slice($split, 2);
$relPath = implode('/', $sliced);
return $relPath;
}
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/**
* @brief try to get the user from the path if no user is logged in
* @param string $path
* @return mixed user or false if we couldn't determine a user
*/
public static function getUser($path) {
$user = \OCP\User::getUser();
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// if we are logged in, then we return the userid
if ($user) {
return $user;
}
// if no user is logged in we try to access a publicly shared files.
// In this case we need to try to get the user from the path
$trimmed = ltrim($path, '/');
$split = explode('/', $trimmed);
// it is not a file relative to data/user/files
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if (count($split) < 2 || ($split[1] !== 'files' && $split[1] !== 'cache')) {
return false;
}
$user = $split[0];
if (\OCP\User::userExists($user)) {
return $user;
}
return false;
}
/**
* @brief get path to the corresponding file in data/user/files if path points
* to a version or to a file in cache
* @param string $path path to a version or a file in the trash
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* @return string path to corresponding file relative to data/user/files
*/
public static function getPathToRealFile($path) {
$trimmed = ltrim($path, '/');
$split = explode('/', $trimmed);
$result = false;
if (count($split) >= 3 && ($split[1] === "files_versions" || $split[1] === 'cache')) {
$sliced = array_slice($split, 2);
$result = implode('/', $sliced);
if ($split[1] === "files_versions") {
// we skip user/files
$sliced = array_slice($split, 2);
$relPath = implode('/', $sliced);
//remove the last .v
$result = substr($relPath, 0, strrpos($relPath, '.v'));
}
if ($split[1] === "cache") {
// we skip /user/cache/transactionId
$sliced = array_slice($split, 3);
$result = implode('/', $sliced);
//prepare the folders
self::mkdirr($path, new \OC\Files\View('/'));
}
}
return $result;
}
/**
* @brief create directory recursively
* @param string $path
* @param \OC\Files\View $view
*/
public static function mkdirr($path, $view) {
$dirname = \OC_Filesystem::normalizePath(dirname($path));
$dirParts = explode('/', $dirname);
$dir = "";
foreach ($dirParts as $part) {
$dir = $dir . '/' . $part;
if (!$view->file_exists($dir)) {
$view->mkdir($dir);
}
}
}
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/**
* @brief redirect to a error page
* @param Session $session
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*/
public static function redirectToErrorPage($session, $errorCode = null) {
if ($errorCode === null) {
$init = $session->getInitialized();
switch ($init) {
case \OCA\Encryption\Session::INIT_EXECUTED:
$errorCode = \OCA\Encryption\Crypt::ENCRYPTION_PRIVATE_KEY_NOT_VALID_ERROR;
break;
case \OCA\Encryption\Session::NOT_INITIALIZED:
$errorCode = \OCA\Encryption\Crypt::ENCRYPTION_NOT_INITIALIZED_ERROR;
break;
default:
$errorCode = \OCA\Encryption\Crypt::ENCRYPTION_UNKNOWN_ERROR;
}
}
$location = \OC_Helper::linkToAbsolute('apps/files_encryption/files', 'error.php');
$post = 0;
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if(count($_POST) > 0) {
$post = 1;
}
header('Location: ' . $location . '?p=' . $post . '&errorCode=' . $errorCode);
exit();
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}
/**
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* check requirements for encryption app.
* @return bool true if requirements are met
*/
public static function checkRequirements() {
$result = true;
//openssl extension needs to be loaded
$result &= extension_loaded("openssl");
// we need php >= 5.3.3
$result &= version_compare(phpversion(), '5.3.3', '>=');
return (bool) $result;
}
/**
* check some common errors if the server isn't configured properly for encryption
* @return bool true if configuration seems to be OK
*/
public static function checkConfiguration() {
if(self::getOpenSSLPkey()) {
return true;
} else {
while ($msg = openssl_error_string()) {
\OCP\Util::writeLog('Encryption library', 'openssl_pkey_new() fails: ' . $msg, \OCP\Util::ERROR);
}
return false;
}
}
/**
* Create an openssl pkey with config-supplied settings
* WARNING: This initializes a new private keypair, which is computationally expensive
* @return resource The pkey resource created
*/
public static function getOpenSSLPkey() {
return openssl_pkey_new(self::getOpenSSLConfig());
}
/**
* Return an array of OpenSSL config options, default + config
* Used for multiple OpenSSL functions
* @return array The combined defaults and config settings
*/
public static function getOpenSSLConfig() {
$config = array('private_key_bits' => 4096);
$config = array_merge(\OCP\Config::getSystemValue('openssl', array()), $config);
return $config;
}
/**
* @brief glob uses different pattern than regular expressions, escape glob pattern only
* @param string $path unescaped path
* @return string path
*/
public static function escapeGlobPattern($path) {
return preg_replace('/(\*|\?|\[)/', '[$1]', $path);
}
/**
* @brief remember from which file the tmp file (getLocalFile() call) was created
* @param string $tmpFile path of tmp file
* @param string $originalFile path of the original file relative to data/
*/
public static function addTmpFileToMapper($tmpFile, $originalFile) {
self::$tmpFileMapping[$tmpFile] = $originalFile;
}
/**
* @brief get the path of the original file
* @param string $tmpFile path of the tmp file
* @return string|false path of the original file or false
*/
public static function getPathFromTmpFile($tmpFile) {
if (isset(self::$tmpFileMapping[$tmpFile])) {
return self::$tmpFileMapping[$tmpFile];
}
return false;
}
}