746 lines
22 KiB
PHP
746 lines
22 KiB
PHP
<?php
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/*
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This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
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Copyright (C) 2006 - 2019 Roland Gruber
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* This file includes functions to perform several security checks on each page load.
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*
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* @package lib
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* @author Roland Gruber
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*/
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/** configuration options */
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include_once('config.inc');
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/** ldap connection */
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include_once('ldap.inc');
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/** common functions */
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include_once('account.inc');
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// check client IP address
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checkClientIP();
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setLAMHeaders();
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/**
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* Starts a session and sets the cookie options.
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*/
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function lam_start_session() {
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$secureFlag = false;
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if (isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) === 'on') {
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$secureFlag = true;
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}
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session_set_cookie_params(0, '/', null, $secureFlag, true);
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session_start();
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}
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/**
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* Starts a session and checks the environment.
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* The script is stopped if one of the checks fail (timeout redirection may be overriden).
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*
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* @param boolean $redirectToLogin redirect user to login page (default: true)
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* @param boolean $initSecureData init verification data like session ID and client IP (default: false)
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* @return boolean true if all ok, false if session expired
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*/
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function startSecureSession($redirectToLogin = true, $initSecureData = false) {
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// start session
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if (isset($_SESSION)) {
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unset($_SESSION);
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}
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if (strtolower(session_module_name()) == 'files') {
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$sessionDir = dirname(__FILE__) . "/../sess";
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session_save_path($sessionDir);
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// enable garbage collection (fix for Debian based systems)
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if (@ini_get("session.gc_probability") == 0) {
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@ini_set("session.gc_probability", 1);
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}
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}
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lam_start_session();
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// init secure data if needed
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if ($initSecureData && !isset($_SESSION["sec_session_id"])) {
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$_SESSION["sec_session_id"] = session_id();
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$_SESSION["sec_client_ip"] = $_SERVER['REMOTE_ADDR'];
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$_SESSION['sec_sessionTime'] = time();
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$_SESSION['cfgMain'] = new LAMCfgMain();
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}
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// set error reporting
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if (empty($_SESSION['cfgMain']) || ($_SESSION['cfgMain']->errorReporting == LAMCfgMain::ERROR_REPORTING_DEFAULT)) {
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ini_set('error_reporting', 'E_ALL & ~E_NOTICE');
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}
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elseif ($_SESSION['cfgMain']->errorReporting == LAMCfgMain::ERROR_REPORTING_ALL) {
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ini_set('error_reporting', E_ALL | E_STRICT);
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ini_set('display_errors', 'On');
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}
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// check session id
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if (! isset($_SESSION["sec_session_id"]) || ($_SESSION["sec_session_id"] != session_id())) {
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// session id is invalid
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logNewMessage(LOG_WARNING, "Invalid session ID, access denied (" . getClientIPForLogging() . ")");
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if ($redirectToLogin) {
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logoffAndBackToLoginPage();
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}
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else {
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die();
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}
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}
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// check if client IP has not changed
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if (!isset($_SESSION["sec_client_ip"]) || ($_SESSION["sec_client_ip"] != $_SERVER['REMOTE_ADDR'])) {
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// IP is invalid
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logNewMessage(LOG_WARNING, "Client IP changed, access denied (" . getClientIPForLogging() . ")");
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die();
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}
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// check if session time has not expired
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if (($_SESSION['sec_sessionTime'] + (60 * $_SESSION['cfgMain']->sessionTimeout)) > time()) {
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// ok, update time
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$_SESSION['sec_sessionTime'] = time();
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}
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elseif ($redirectToLogin) {
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// session expired, logoff user
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logoffAndBackToLoginPage();
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}
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else {
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return false;
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}
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setSSLCaCert();
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return true;
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}
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/**
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* Checks if the client's IP address is on the list of allowed IPs.
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* The script is stopped if the host is not valid.
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*
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*/
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function checkClientIP() {
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if (isset($_SESSION['cfgMain'])) {
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$cfg = $_SESSION['cfgMain'];
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}
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else {
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$cfg = new LAMCfgMain();
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}
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$allowedHosts = $cfg->allowedHosts;
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$url = getCallingURL();
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if ((strpos($url, '/selfService/selfService') !== false) || ((strpos($url, '/misc/ajax.php?') !== false) && strpos($url, 'selfservice=1') !== false)) {
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// self service pages have separate IP list
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$allowedHosts = $cfg->allowedHostsSelfService;
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}
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// skip test if no hosts are defined
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if (empty($allowedHosts) || empty($_SERVER['REMOTE_ADDR'])) {
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return;
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}
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$allowedHosts = explode(",", $allowedHosts);
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$grantAccess = false;
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for ($i = 0; $i < sizeof($allowedHosts); $i++) {
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$host = $allowedHosts[$i];
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$ipRegex = '/^[0-9a-z\\.:\\*]+$/i';
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if (!preg_match($ipRegex, $host)) {
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continue;
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}
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$hostRegex = str_replace(".", "\\.", $host);
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$hostRegex = '/^' . str_replace("*", ".*", $hostRegex) . '$/';
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$clientIP = $_SERVER['REMOTE_ADDR'];
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if (preg_match($hostRegex, $clientIP)) {
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// client is allowed to access LAM
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$grantAccess = true;
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}
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}
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// stop script is client may not access LAM
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if (!$grantAccess) {
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logNewMessage(LOG_WARNING, "Invalid client IP, access denied (" . getClientIPForLogging() . ")");
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die();
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}
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}
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/**
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* Logs off the user and displays the login page.
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*
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*/
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function logoffAndBackToLoginPage() {
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// log message
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if (isset($_SESSION['ldap'])) {
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$ldapUser = $_SESSION['ldap']->decrypt_login();
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logNewMessage(LOG_WARNING, 'Session of user ' . $ldapUser[0] . ' expired.');
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// close LDAP connection
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@$_SESSION["ldap"]->destroy();
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}
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elseif (isset($_SESSION['selfService_clientDN']) || (strpos($_SERVER['REQUEST_URI'], '/selfService/') !== false)) {
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logNewMessage(LOG_WARNING, 'Self service session of DN ' . lamDecrypt($_SESSION['selfService_clientDN'], 'SelfService') . ' expired.');
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}
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// delete key and iv in cookie
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if (function_exists('openssl_random_pseudo_bytes')) {
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setcookie("Key", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/", null, null, true);
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setcookie("IV", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/", null, null, true);
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}
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// link back to login page
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$paths = array('./', '../', '../../', '../../../', '../../../../');
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$page = 'login.php';
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$pageSuffix = '?expired=yes';
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if (isset($_SESSION['selfService_clientDN']) || (strpos($_SERVER['REQUEST_URI'], '/selfService/') !== false)) {
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$scope = $_GET['scope'];
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$name = $_GET['name'];
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if (!preg_match('/^[0-9a-zA-Z _-]+$/', $scope) || !preg_match('/^[0-9a-zA-Z _-]+$/', $name)) {
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logNewMessage(LOG_ERR, 'GET parameters invalid: ' . $name . ' ' . $scope);
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die();
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}
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$page = 'selfServiceLogin.php';
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$pageSuffix = '?expired=yes&scope=' . $scope . '&name=' . $name;
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}
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for ($i = 0; $i < sizeof($paths); $i++) {
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if (file_exists($paths[$i] . $page)) {
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$page = $paths[$i] . $page;
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break;
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}
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}
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$page .= $pageSuffix;
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echo $_SESSION['header'];
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echo "<title></title>\n";
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echo "</head>\n";
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echo "<body>\n";
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// print JavaScript refresh
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echo "<script type=\"text/javascript\">\n";
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echo "top.location.href = \"" . $page . "\";\n";
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echo "</script>\n";
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// print link if refresh does not work
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echo "<p>\n";
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echo "<a target=\"_top\" href=\"" . $page . "\">" . _("Your session expired, click here to go back to the login page.") . "</a>\n";
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echo "</p>\n";
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echo "</body>\n";
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echo "</html>\n";
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// destroy session
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session_destroy();
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unset($_SESSION);
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die();
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}
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/**
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* Returns if debug messages are to be logged.
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*
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* @return boolean debug enabled
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*/
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function isDebugLoggingEnabled() {
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if (isset($_SESSION['cfgMain'])) {
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$cfg = $_SESSION['cfgMain'];
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}
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else {
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$cfg = new LAMCfgMain();
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}
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return $cfg->logLevel >= LOG_DEBUG;
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}
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/**
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* Puts a new message in the log file.
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*
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* @param string $level log level (LOG_DEBUG, LOG_NOTICE, LOG_WARNING, LOG_ERR)
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* @param string $message log message
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*/
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function logNewMessage($level, $message) {
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$possibleLevels = array(LOG_DEBUG => 'DEBUG', LOG_NOTICE => 'NOTICE', LOG_WARNING => 'WARNING', LOG_ERR => 'ERROR');
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if (!in_array($level, array_keys($possibleLevels))) {
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StatusMessage('ERROR', 'Invalid log level!', $level);
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}
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if (isset($_SESSION['cfgMain'])) {
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$cfg = $_SESSION['cfgMain'];
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}
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else {
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$cfg = new LAMCfgMain();
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}
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// check if logging is disabled
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if (($cfg->logDestination == 'NONE')
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// check if log level is high enough
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|| ($cfg->logLevel < $level)) {
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return;
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}
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// ok to log, build log message
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$prefix = "LDAP Account Manager (" . session_id() . ' - ' . getClientIPForLogging() . ") - " . $possibleLevels[$level] . ": ";
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$message = $prefix . $message;
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// Syslog logging
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if ($cfg->logDestination == 'SYSLOG') {
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syslog($level, $message);
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}
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// log to file
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else {
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@touch($cfg->logDestination);
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if (is_writable($cfg->logDestination)) {
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$file = fopen($cfg->logDestination, 'a');
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if ($file) {
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$timeZone = 'UTC';
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$sysTimeZone = @date_default_timezone_get();
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if (!empty($sysTimeZone)) {
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$timeZone = $sysTimeZone;
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}
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$time = new DateTime(null, new DateTimeZone($timeZone));
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fwrite($file, $time->format('Y-m-d H:i:s') . ': ' . $message . "\n");
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fclose($file);
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}
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}
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else {
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StatusMessage('ERROR', 'Unable to write to log file!', $cfg->logDestination);
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}
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}
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}
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/**
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* Checks if write access to LDAP is allowed.
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*
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* @param String $scope account type (e.g. user)
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* @return boolean true, if allowed
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*/
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function checkIfWriteAccessIsAllowed($scope = null) {
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if (!isset($_SESSION['config'])) {
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return false;
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}
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if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_ALL) {
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$typeSettings = $_SESSION['config']->get_typeSettings();
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if (($scope == null)
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// check if write for this type is allowed
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|| !isset($typeSettings['readOnly_' . $scope])
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|| !$typeSettings['readOnly_' . $scope]) {
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return true;
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}
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}
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return false;
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}
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/**
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* Checks if passwords may be changed.
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*
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* @return boolean true, if allowed
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*/
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function checkIfPasswordChangeIsAllowed() {
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if (!isset($_SESSION['config'])) {
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return false;
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}
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if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_PASSWORD_CHANGE) {
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return true;
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}
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return false;
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}
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/**
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* Checks if it is allowed to create new LDAP entries of the given type.
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* This also checks if general write access is enabled.
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*
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* @param String $scope account type (e.g. 'user')
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* @return boolean true, if new entries are allowed
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*/
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function checkIfNewEntriesAreAllowed($scope) {
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if (!isLAMProVersion()) {
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return true;
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}
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if (!isset($_SESSION['config']) || empty($scope)) {
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return false;
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}
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$typeSettings = $_SESSION['config']->get_typeSettings();
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if (isset($typeSettings['hideNewButton_' . $scope]) && $typeSettings['hideNewButton_' . $scope]) {
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return false;
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}
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return checkIfWriteAccessIsAllowed();
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}
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/**
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* Checks if it is allowed to delete LDAP entries of the given type.
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*
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* @param String $scope account type (e.g. 'user')
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* @return boolean true, if entries may be deleted
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*/
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function checkIfDeleteEntriesIsAllowed($scope) {
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if (!isLAMProVersion()) {
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return true;
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}
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if (!isset($_SESSION['config']) || empty($scope)) {
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return false;
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}
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$typeSettings = $_SESSION['config']->get_typeSettings();
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if (isset($typeSettings['hideDeleteButton_' . $scope]) && $typeSettings['hideDeleteButton_' . $scope]) {
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return false;
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}
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return checkIfWriteAccessIsAllowed();
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}
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/**
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* Checks if the password fulfills the password policies.
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*
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* @param String $password password
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* @param String $userName user name
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* @param array $otherUserAttrs user's first/last name
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* @return mixed true if ok, string with error message if not valid
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*/
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function checkPasswordStrength($password, $userName, $otherUserAttrs) {
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if ($password == null) {
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$password = "";
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}
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if (isset($_SESSION['cfgMain'])) {
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$cfg = $_SESSION['cfgMain'];
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}
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else {
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$cfg = new LAMCfgMain();
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}
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// check length
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if (strlen($password) < $cfg->passwordMinLength) {
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return sprintf(_('The password is too short. You have to enter at least %s characters.'), $cfg->passwordMinLength);
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}
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// get number of characers per character class
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$lower = 0;
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$upper = 0;
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$numeric = 0;
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$symbols = 0;
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for ($i = 0; $i < strlen($password); $i++) {
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if (preg_match("/[a-z]/", $password[$i])) {
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$lower++;
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}
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if (preg_match("/[A-Z]/", $password[$i])) {
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$upper++;
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}
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if (preg_match("/[0-9]/", $password[$i])) {
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$numeric++;
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}
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if (preg_match("/[^a-z0-9]/i", $password[$i])) {
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$symbols++;
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}
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}
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$rulesMatched = 0;
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$rulesFailed = 0;
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// check lower case
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if (($cfg->checkedRulesCount == -1) && ($lower < $cfg->passwordMinLower)) {
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return sprintf(_('The password is too weak. You have to enter at least %s lower case characters.'), $cfg->passwordMinLower);
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}
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if ($lower < $cfg->passwordMinLower) {
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$rulesFailed++;
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}
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else {
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$rulesMatched++;
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}
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// check upper case
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if (($cfg->checkedRulesCount == -1) && ($upper < $cfg->passwordMinUpper)) {
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return sprintf(_('The password is too weak. You have to enter at least %s upper case characters.'), $cfg->passwordMinUpper);
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}
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if ($upper < $cfg->passwordMinUpper) {
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$rulesFailed++;
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}
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else {
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$rulesMatched++;
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}
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// check numeric
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if (($cfg->checkedRulesCount == -1) && ($numeric < $cfg->passwordMinNumeric)) {
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return sprintf(_('The password is too weak. You have to enter at least %s numeric characters.'), $cfg->passwordMinNumeric);
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}
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if ($numeric < $cfg->passwordMinNumeric) {
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$rulesFailed++;
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}
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else {
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$rulesMatched++;
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}
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// check symbols
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if (($cfg->checkedRulesCount == -1) && ($symbols < $cfg->passwordMinSymbol)) {
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return sprintf(_('The password is too weak. You have to enter at least %s symbolic characters.'), $cfg->passwordMinSymbol);
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}
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if ($symbols < $cfg->passwordMinSymbol) {
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$rulesFailed++;
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}
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else {
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$rulesMatched++;
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}
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// check classes
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$classes = 0;
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if ($lower > 0) {
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$classes++;
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}
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if ($upper > 0) {
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$classes++;
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}
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if ($numeric > 0) {
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$classes++;
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}
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if ($symbols > 0) {
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$classes++;
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}
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if (($cfg->checkedRulesCount == -1) && ($classes < $cfg->passwordMinClasses)) {
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return sprintf(_('The password is too weak. You have to enter at least %s different character classes (upper/lower case, numbers and symbols).'), $cfg->passwordMinClasses);
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}
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if ($classes < $cfg->passwordMinClasses) {
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$rulesFailed++;
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}
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else {
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$rulesMatched++;
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}
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// check rules count
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if (($cfg->checkedRulesCount != -1) && ($rulesMatched < $cfg->checkedRulesCount)) {
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return sprintf(_('The password is too weak. It needs to match at least %s password complexity rules.'), $cfg->checkedRulesCount);
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}
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// check user name
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if (($cfg->passwordMustNotContainUser == 'true') && !empty($userName)) {
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$pwdLow = strtolower($password);
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$userLow = strtolower($userName);
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if (strpos($pwdLow, $userLow) !== false) {
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return _('The password is too weak. You may not use the user name as part of the password.');
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}
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}
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// check part of user name and additional attributes
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if (($cfg->passwordMustNotContain3Chars == 'true') && (!empty($userName) || !empty($otherUserAttrs))) {
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$pwdLow = strtolower($password);
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// check if contains part of user name
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if (!empty($userName) && (strlen($userName) > 2)) {
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$userLow = strtolower($userName);
|
|
for ($i = 0; $i < strlen($userLow) - 3; $i++) {
|
|
$part = substr($userLow, 0, 3);
|
|
if (strpos($pwdLow, $part) !== false) {
|
|
return _('The password is too weak. You may not use parts of the user name for the password.');
|
|
}
|
|
}
|
|
}
|
|
// check other attributes
|
|
foreach ($otherUserAttrs as $other) {
|
|
$low = strtolower($other);
|
|
for ($i = 0; $i < strlen($low) - 3; $i++) {
|
|
$part = substr($low, 0, 3);
|
|
if (strpos($pwdLow, $part) !== false) {
|
|
return _('The password is too weak. You may not use parts of user attributes for the password.');
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// check external password service
|
|
if (!checkPwdWithExternalPasswordService($cfg, $password)) {
|
|
return _('Your selected password is known to be insecure.');
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Checks the password against the external password service.
|
|
*
|
|
* @param LAMCfgMain $cfg main configuration
|
|
* @param string $password password
|
|
* @return boolean password accepted as secure
|
|
*/
|
|
function checkPwdWithExternalPasswordService($cfg, $password) {
|
|
if (!function_exists('curl_init') || empty($cfg->externalPwdCheckUrl)) {
|
|
return true;
|
|
}
|
|
$sha1 = sha1($password);
|
|
$sha1Prefix = substr($sha1, 0, 5);
|
|
$sha1Suffix = substr($sha1, 5);
|
|
$curl = curl_init();
|
|
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
|
|
$url = $cfg->externalPwdCheckUrl;
|
|
$url = str_replace('{SHA1PREFIX}', $sha1Prefix, $url);
|
|
curl_setopt($curl, CURLOPT_URL, $url);
|
|
$results = curl_exec($curl);
|
|
$code = curl_errno($curl);
|
|
if ($code) {
|
|
logNewMessage(LOG_ERR, 'Error calling the external password service at ' . $url
|
|
. '. ' . curl_error($curl));
|
|
return true;
|
|
}
|
|
curl_close($curl);
|
|
if (empty($results)) {
|
|
return true;
|
|
}
|
|
$results = explode("\n", $results);
|
|
foreach ($results as $result) {
|
|
if (stripos($result, $sha1Suffix . ':') !== false) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Checks if the given tool is active.
|
|
* Otherwise, an error message is logged and the execution is stopped (die()).
|
|
*
|
|
* @param String $tool tool class name (e.g. toolFileUpload)
|
|
*/
|
|
function checkIfToolIsActive($tool) {
|
|
$toolSettings = $_SESSION['config']->getToolSettings();
|
|
// check if hidden by config
|
|
if (isset($toolSettings['tool_hide_' . $tool]) && ($toolSettings['tool_hide_' . $tool] == 'true')) {
|
|
logNewMessage(LOG_ERR, 'Unauthorized access to tool ' . $tool . ' denied.');
|
|
die();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns if the user is logged in.
|
|
*
|
|
* @return boolean is logged in
|
|
*/
|
|
function isLoggedIn() {
|
|
return (isset($_SESSION['loggedIn']) && ($_SESSION['loggedIn'] === true));
|
|
}
|
|
|
|
/**
|
|
* Returns the client IP and comma separated proxy IPs if any (HTTP_X_FORWARDED_FOR, HTTP_X_REAL_IP).
|
|
*
|
|
* @return String client IP (e.g. 10.10.10.10,11.11.11.11)
|
|
*/
|
|
function getClientIPForLogging() {
|
|
$ip = empty($_SERVER['REMOTE_ADDR']) ? '' : $_SERVER['REMOTE_ADDR'];
|
|
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) && (strlen($_SERVER['HTTP_X_FORWARDED_FOR']) < 100)) {
|
|
$ip .= ',' . $_SERVER['HTTP_X_FORWARDED_FOR'];
|
|
}
|
|
if (!empty($_SERVER['HTTP_X_REAL_IP']) && (strlen($_SERVER['HTTP_X_REAL_IP']) < 100)) {
|
|
$ip .= ',' . $_SERVER['HTTP_X_REAL_IP'];
|
|
}
|
|
return $ip;
|
|
}
|
|
|
|
/**
|
|
* Adds a security token to the session to prevent CSRF attacks.
|
|
*
|
|
* @param boolean $overwrite overwrite existing token
|
|
*/
|
|
function addSecurityTokenToSession($overwrite = true) {
|
|
if (!empty($_SESSION[getSecurityTokenName()]) && !$overwrite) {
|
|
return;
|
|
}
|
|
$_SESSION[getSecurityTokenName()] = getRandomNumber();
|
|
}
|
|
|
|
/**
|
|
* Checks if the security token from SESSION matches POST data.
|
|
*/
|
|
function validateSecurityToken() {
|
|
if (empty($_POST)) {
|
|
return;
|
|
}
|
|
if (empty($_POST[getSecurityTokenName()]) || ($_POST[getSecurityTokenName()] != $_SESSION[getSecurityTokenName()])) {
|
|
logNewMessage(LOG_ERR, 'Security token does not match POST data.');
|
|
die();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Adds a hidden input field to the given meta HTML table.
|
|
* Should be used to add token at the end of table.
|
|
*
|
|
* @param htmlTable|htmlGroup|htmlResponsiveRow $container table
|
|
*/
|
|
function addSecurityTokenToMetaHTML(&$container) {
|
|
$token = new htmlHiddenInput(getSecurityTokenName(), $_SESSION[getSecurityTokenName()]);
|
|
if ($container instanceof htmlResponsiveRow) {
|
|
$container->add($token, 12);
|
|
return;
|
|
}
|
|
$container->addElement($token, true);
|
|
}
|
|
|
|
/**
|
|
* Returns the name of the security token parameter.
|
|
*
|
|
* @return String name
|
|
*/
|
|
function getSecurityTokenName() {
|
|
return 'sec_token';
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the security token parameter.
|
|
*
|
|
* @return String value
|
|
*/
|
|
function getSecurityTokenValue() {
|
|
return $_SESSION[getSecurityTokenName()];
|
|
}
|
|
|
|
/**
|
|
* Sets the X-Frame-Options and Content-Security-Policy header to prevent clickjacking.
|
|
*/
|
|
function setLAMHeaders() {
|
|
if (!headers_sent()) {
|
|
header('X-Frame-Options: sameorigin');
|
|
header('Content-Security-Policy: frame-ancestors \'self\'; form-action \'self\'; base-uri \'none\'; object-src \'none\'; frame-src \'self\'; worker-src \'self\'');
|
|
header('X-Content-Type-Options: nosniff');
|
|
header('X-XSS-Protection: 1; mode=block');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Encrypts a string
|
|
*
|
|
* @param string $data string to encrypt
|
|
* @param string $prefix prefix for cookie names
|
|
* @return object encrypted string
|
|
*/
|
|
function lamEncrypt($data, $prefix='') {
|
|
// use OpenSSL if available
|
|
if (function_exists('openssl_random_pseudo_bytes')) {
|
|
// OpenSSL may have been enabled in a running session
|
|
if (!isset($_COOKIE[$prefix . "IV"])
|
|
|| ($_COOKIE[$prefix . "IV"] == '')
|
|
|| ($_COOKIE[$prefix . "IV"] == "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")) {
|
|
return $data;
|
|
}
|
|
// read key and iv from cookie
|
|
$iv = base64_decode($_COOKIE[$prefix . "IV"]);
|
|
$key = base64_decode($_COOKIE[$prefix . "Key"]);
|
|
// encrypt string
|
|
return openssl_encrypt(base64_encode($data), lamEncryptionAlgo(), $key, 0, $iv);
|
|
}
|
|
// otherwise do not encrypt
|
|
else {
|
|
return $data;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Decrypts a string
|
|
*
|
|
* @param object $data string to decrypt
|
|
* @param string $prefix prefix for cookie names
|
|
* @return string decrypted string
|
|
*/
|
|
function lamDecrypt($data, $prefix='') {
|
|
// use OpenSSL if available
|
|
if (function_exists('openssl_random_pseudo_bytes')) {
|
|
// OpenSSL may have been enabled in a running session
|
|
if (!isset($_COOKIE[$prefix . "IV"])
|
|
|| ($_COOKIE[$prefix . "IV"] == '')
|
|
|| ($_COOKIE[$prefix . "IV"] == "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")) {
|
|
return $data;
|
|
}
|
|
// read key and iv from cookie
|
|
$iv = base64_decode($_COOKIE[$prefix . "IV"]);
|
|
$key = base64_decode($_COOKIE[$prefix . "Key"]);
|
|
// decrypt string
|
|
$ret = openssl_decrypt($data, lamEncryptionAlgo(), $key, 0, $iv);
|
|
return base64_decode(str_replace(chr(00), "", $ret));
|
|
}
|
|
// otherwise do not decrypt
|
|
else {
|
|
return $data;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the encryption algorithm to use.
|
|
*
|
|
* @return string algorithm name
|
|
*/
|
|
function lamEncryptionAlgo() {
|
|
$possibleAlgos = openssl_get_cipher_methods();
|
|
if (in_array('AES-256-CTR', $possibleAlgos)) {
|
|
return 'AES-256-CTR';
|
|
}
|
|
elseif (in_array('AES-256-CBC', $possibleAlgos)) {
|
|
return 'AES-256-CBC';
|
|
}
|
|
return 'AES256';
|
|
}
|
|
|
|
?>
|