LDAPAccountManager/lam/lib/security.inc

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<?php
/*
$Id$
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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
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* This file includes functions to perform several security checks on each page load.
*
* @package lib
* @author Roland Gruber
*/
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/** configuration options */
include_once('config.inc');
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/** ldap connection */
include_once('ldap.inc');
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// check client IP address
checkClientIP();
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/**
* Starts a session and checks the environment.
* The script is stopped if one of the checks fail.
*/
function startSecureSession() {
// start session
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);
// enable garbage collection (fix for Debian based systems)
if (@ini_get("session.gc_probability") == 0) {
@ini_set("session.gc_probability", 1);
}
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}
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@session_start();
// check session id
if (! isset($_SESSION["sec_session_id"]) || ($_SESSION["sec_session_id"] != session_id())) {
// session id is invalid
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logNewMessage(LOG_WARNING, "Invalid session ID, access denied (" . $_SERVER['REMOTE_ADDR'] . ")");
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die();
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}
// check if client IP has not changed
if (!isset($_SESSION["sec_client_ip"]) || ($_SESSION["sec_client_ip"] != $_SERVER['REMOTE_ADDR'])) {
// IP is invalid
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logNewMessage(LOG_WARNING, "Client IP changed, access denied (" . $_SERVER['REMOTE_ADDR'] . ")");
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die();
}
// check if session time has not expired
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if (($_SESSION['sec_sessionTime'] + (60 * $_SESSION['cfgMain']->sessionTimeout)) > time()) {
// ok, update time
$_SESSION['sec_sessionTime'] = time();
}
else {
// session expired, logoff user
logoffAndBackToLoginPage();
}
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}
/**
* Checks if the client's IP address is on the list of allowed IPs.
* The script is stopped if the host is not valid.
*
*/
function checkClientIP() {
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if (isset($_SESSION['cfgMain'])) $cfg = $_SESSION['cfgMain'];
else $cfg = new LAMCfgMain();
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$allowedHosts = $cfg->allowedHosts;
// skip test if no hosts are defined
if ($allowedHosts == "") return;
$allowedHosts = explode(",", $allowedHosts);
$grantAccess = false;
for ($i = 0; $i < sizeof($allowedHosts); $i++) {
$host = $allowedHosts[$i];
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$ipRegex = '/^[0-9a-z\\.:\\*]+$/i';
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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
$grantAccess = true;
}
}
// stop script is client may not access LAM
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if (!$grantAccess) {
logNewMessage(LOG_WARNING, "Invalid client IP, access denied (" . $_SERVER['REMOTE_ADDR'] . ")");
die();
}
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}
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/**
* Logs off the user and displays the login page.
*
*/
function logoffAndBackToLoginPage() {
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// log message
$ldapUser = $_SESSION['ldap']->decrypt_login();
logNewMessage(LOG_WARNING, 'Session of user ' . $ldapUser[0] . ' expired.');
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// delete key and iv in cookie
if (function_exists('mcrypt_create_iv')) {
setcookie("Key", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/");
setcookie("IV", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/");
}
// close LDAP connection
@$_SESSION["ldap"]->destroy();
// link back to login page
$paths = array('./', '../', '../../', '../../../');
$page = 'login.php';
for ($i = 0; $i < sizeof($paths); $i++) {
if (file_exists($paths[$i] . $page)) {
$page = $paths[$i] . $page;
break;
}
}
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$page .= "?expired=yes";
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echo $_SESSION['header'];
echo "<title></title>\n";
echo "</head>\n";
echo "<body>\n";
// print JavaScript refresh
echo "<script type=\"text/javascript\">\n";
echo "top.location.href = \"" . $page . "\";\n";
echo "</script>\n";
// print link if refresh does not work
echo "<p>\n";
echo "<a target=\"_top\" href=\"" . $page . "\">" . _("Your session expired, click here to go back to the login page.") . "</a>\n";
echo "</p>\n";
echo "</body>\n";
echo "</html>\n";
// destroy session
session_destroy();
unset($_SESSION);
die();
}
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/**
* Puts a new message in the log file.
*
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* @param string $level log level (LOG_DEBUG, LOG_NOTICE, LOG_WARNING, LOG_ERR)
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* @param string $message log message
*/
function logNewMessage($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!', $level);
if (isset($_SESSION['cfgMain'])) $cfg = $_SESSION['cfgMain'];
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else $cfg = new LAMCfgMain();
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// check if logging is disabled
if ($cfg->logDestination == 'NONE') return;
// check if log level is high enough
elseif ($cfg->logLevel < $level) return;
// ok to log, build log message
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$prefix = "LDAP Account Manager (" . session_id() . ' - ' . $_SERVER['REMOTE_ADDR'] . ") - " . $possibleLevels[$level] . ": ";
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$message = $prefix . $message;
// Syslog logging
if ($cfg->logDestination == 'SYSLOG') {
syslog($level, $message);
}
// log to file
else {
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@touch($cfg->logDestination);
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if (is_writable($cfg->logDestination)) {
$file = fopen($cfg->logDestination, 'a');
if ($file) {
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fwrite($file, date('Y-m-d H:i:s') . ': ' . $message . "\n");
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fclose($file);
}
}
else {
StatusMessage('ERROR', 'Unable to write to log file!', $cfg->logDestination);
}
}
}
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/**
* Checks if write access to LDAP is allowed.
*
* @return boolean true, if allowed
*/
function checkIfWriteAccessIsAllowed() {
if (!isset($_SESSION['config'])) {
return false;
}
if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_ALL) {
return true;
}
return false;
}
/**
* Checks if passwords may be changed.
*
* @return boolean true, if allowed
*/
function checkIfPasswordChangeIsAllowed() {
if (!isset($_SESSION['config'])) {
return false;
}
if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_PASSWORD_CHANGE) {
return true;
}
return false;
}
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/**
* Checks if the password fulfills the password policies.
*
* @param string $password password
* @return mixed true if ok, string with error message if not valid
*/
function checkPasswordStrength($password) {
if ($password == null) {
$password = "";
}
if (isset($_SESSION['cfgMain'])) $cfg = $_SESSION['cfgMain'];
else $cfg = new LAMCfgMain();
// check length
if (strlen($password) < $cfg->passwordMinLength) {
return sprintf(_('The password is too short. You have to enter at least %s characters.'), $cfg->passwordMinLength);
}
// get number of characers per character class
$lower = 0;
$upper = 0;
$numeric = 0;
$symbols = 0;
for ($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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if (preg_match("/[A-Z]/", $password[$i])) {
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$upper++;
}
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if (preg_match("/[0-9]/", $password[$i])) {
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$numeric++;
}
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if (preg_match("/[^a-z0-9]/i", $password[$i])) {
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$symbols++;
}
}
// check lower case
if ($lower < $cfg->passwordMinLower) {
return sprintf(_('The password is too weak. You have to enter at least %s lower case characters.'), $cfg->passwordMinLower);
}
// check upper case
if ($upper < $cfg->passwordMinUpper) {
return sprintf(_('The password is too weak. You have to enter at least %s upper case characters.'), $cfg->passwordMinUpper);
}
// check numeric
if ($numeric < $cfg->passwordMinNumeric) {
return sprintf(_('The password is too weak. You have to enter at least %s numeric characters.'), $cfg->passwordMinNumeric);
}
// check symbols
if ($symbols < $cfg->passwordMinSymbol) {
return sprintf(_('The password is too weak. You have to enter at least %s symbolic characters.'), $cfg->passwordMinSymbol);
}
// check classes
$classes = 0;
if ($lower > 0) {
$classes++;
}
if ($upper > 0) {
$classes++;
}
if ($numeric > 0) {
$classes++;
}
if ($symbols > 0) {
$classes++;
}
if ($classes < $cfg->passwordMinClasses) {
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);
}
return true;
}
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?>