294 lines
8.7 KiB
PHP
294 lines
8.7 KiB
PHP
<?php
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/*
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$Id$
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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 - 2010 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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// check client IP address
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checkClientIP();
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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.
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*/
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function startSecureSession() {
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// start session
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if (isset($_SESSION)) unset($_SESSION);
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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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@session_start();
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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 (" . $_SERVER['REMOTE_ADDR'] . ")");
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die();
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}
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// check if client IP has not changed
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if (!isset($_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 (" . $_SERVER['REMOTE_ADDR'] . ")");
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die();
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}
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// check if session time has not expired
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if (($_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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else {
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// session expired, logoff user
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logoffAndBackToLoginPage();
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}
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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'])) $cfg = $_SESSION['cfgMain'];
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else $cfg = new LAMCfgMain();
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$allowedHosts = $cfg->allowedHosts;
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// skip test if no hosts are defined
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if ($allowedHosts == "") return;
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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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$ipRegex = '/^[0-9\\.\\*]+$/';
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if (!preg_match($ipRegex, $host)) continue;
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$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 (" . $_SERVER['REMOTE_ADDR'] . ")");
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die();
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}
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}
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/**
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* Logs off the user and displays the login page.
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*
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*/
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function logoffAndBackToLoginPage() {
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// log message
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$ldapUser = $_SESSION['ldap']->decrypt_login();
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logNewMessage(LOG_WARNING, 'Session of user ' . $ldapUser[0] . ' expired.');
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// delete key and iv in cookie
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if (function_exists('mcrypt_create_iv')) {
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setcookie("Key", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/");
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setcookie("IV", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/");
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}
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// close LDAP connection
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@$_SESSION["ldap"]->destroy();
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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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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 .= "?expired=yes";
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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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* 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))) StatusMessage('ERROR', 'Invalid log level!', $level);
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if (isset($_SESSION['cfgMain'])) $cfg = $_SESSION['cfgMain'];
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else $cfg = new LAMCfgMain();
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// check if logging is disabled
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if ($cfg->logDestination == 'NONE') return;
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// check if log level is high enough
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elseif ($cfg->logLevel < $level) return;
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// ok to log, build log message
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$prefix = "LDAP Account Manager (" . session_id() . ' - ' . $_SERVER['REMOTE_ADDR'] . ") - " . $possibleLevels[$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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fwrite($file, date('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!', $cfg->logDestination);
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}
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}
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}
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/**
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* Checks if write access to LDAP is allowed.
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*
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* @return boolean true, if allowed
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*/
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function checkIfWriteAccessIsAllowed() {
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if (!isset($_SESSION['config'])) {
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return false;
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}
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if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_ALL) {
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return true;
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}
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return false;
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}
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/**
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* Checks if passwords may be changed.
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*
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* @return boolean true, if allowed
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*/
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function checkIfPasswordChangeIsAllowed() {
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if (!isset($_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 the password fulfills the password policies.
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*
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* @param string $password password
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* @return mixed true if ok, string with error message if not valid
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*/
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function checkPasswordStrength($password) {
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if ($password == null) {
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$password = "";
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}
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if (isset($_SESSION['cfgMain'])) $cfg = $_SESSION['cfgMain'];
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else $cfg = new LAMCfgMain();
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// check length
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if (strlen($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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$symbols++;
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}
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}
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// check lower case
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if ($lower < $cfg->passwordMinLower) {
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return sprintf(_('The password is too weak. You have to enter at least %s lower case characters.'), $cfg->passwordMinLower);
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}
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// check upper case
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if ($upper < $cfg->passwordMinUpper) {
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return sprintf(_('The password is too weak. You have to enter at least %s upper case characters.'), $cfg->passwordMinUpper);
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}
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// check numeric
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if ($numeric < $cfg->passwordMinNumeric) {
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return sprintf(_('The password is too weak. You have to enter at least %s numeric characters.'), $cfg->passwordMinNumeric);
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}
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// check symbols
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if ($symbols < $cfg->passwordMinSymbol) {
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return sprintf(_('The password is too weak. You have to enter at least %s symbolic characters.'), $cfg->passwordMinSymbol);
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}
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// check classes
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$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 ($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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return true;
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}
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?>
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