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/)
Copyright (C) 2006 - 2016 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');
/** common functions */
include_once('account.inc');
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// check client IP address
checkClientIP();
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setLAMHeaders();
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/**
* Starts a session and checks the environment.
* The script is stopped if one of the checks fail (timeout redirection may be overriden).
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*
* @param boolean $redirectToLogin redirect user to login page (default: true)
* @param boolean $initSecureData init verification data like session ID and client IP (default: false)
* @return boolean true if all ok, false if session expired
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*/
function startSecureSession($redirectToLogin = true, $initSecureData = false) {
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// start session
if (isset($_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($sessionDir);
// enable garbage collection (fix for Debian based systems)
if (@ini_get("session.gc_probability") == 0) {
@ini_set("session.gc_probability", 1);
}
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}
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@session_start();
// init secure data if needed
if ($initSecureData && !isset($_SESSION["sec_session_id"])) {
$_SESSION["sec_session_id"] = session_id();
$_SESSION["sec_client_ip"] = $_SERVER['REMOTE_ADDR'];
$_SESSION['sec_sessionTime'] = time();
$_SESSION['cfgMain'] = new LAMCfgMain();
}
// set error reporting
if (empty($_SESSION['cfgMain']) || ($_SESSION['cfgMain']->errorReporting == LAMCfgMain::ERROR_REPORTING_DEFAULT)) {
ini_set('error_reporting', 'E_ALL & ~E_NOTICE');
}
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elseif ($_SESSION['cfgMain']->errorReporting == LAMCfgMain::ERROR_REPORTING_ALL) {
ini_set('error_reporting', E_ALL | E_STRICT);
ini_set('display_errors', 'On');
}
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// check session id
if (! isset($_SESSION["sec_session_id"]) || ($_SESSION["sec_session_id"] != session_id())) {
// session id is invalid
logNewMessage(LOG_WARNING, "Invalid session ID, access denied (" . getClientIPForLogging() . ")");
if ($redirectToLogin) {
logoffAndBackToLoginPage();
}
else {
die();
}
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}
// check if client IP has not changed
if (!isset($_SESSION["sec_client_ip"]) || ($_SESSION["sec_client_ip"] != $_SERVER['REMOTE_ADDR'])) {
// IP is invalid
logNewMessage(LOG_WARNING, "Client IP changed, access denied (" . getClientIPForLogging() . ")");
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die();
}
// check if session time has not expired
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if (($_SESSION['sec_sessionTime'] + (60 * $_SESSION['cfgMain']->sessionTimeout)) > time()) {
// ok, update time
$_SESSION['sec_sessionTime'] = time();
}
elseif ($redirectToLogin) {
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// session expired, logoff user
logoffAndBackToLoginPage();
}
else {
return false;
}
setSSLCaCert();
return true;
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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;
$url = getCallingURL();
if ((strpos($url, '/selfService/selfService') !== false) || ((strpos($url, '/misc/ajax.php?') !== false) && strpos($url, 'selfservice=1') !== false)) {
// self service pages have separate IP list
$allowedHosts = $cfg->allowedHostsSelfService;
}
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// skip test if no hosts are defined
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if (empty($allowedHosts) || empty($_SERVER['REMOTE_ADDR'])) {
return;
}
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$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 (" . getClientIPForLogging() . ")");
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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
if (isset($_SESSION['ldap'])) {
$ldapUser = $_SESSION['ldap']->decrypt_login();
logNewMessage(LOG_WARNING, 'Session of user ' . $ldapUser[0] . ' expired.');
// close LDAP connection
@$_SESSION["ldap"]->destroy();
}
elseif (isset($_SESSION['selfService_clientDN']) || (strpos($_SERVER['REQUEST_URI'], '/selfService/') !== false)) {
logNewMessage(LOG_WARNING, 'Self service session of DN ' . lamDecrypt($_SESSION['selfService_clientDN'], 'SelfService') . ' expired.');
}
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// delete key and iv in cookie
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if (function_exists('openssl_random_pseudo_bytes')) {
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setcookie("Key", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/", null, null, true);
setcookie("IV", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0, "/", null, null, true);
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}
// link back to login page
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$paths = array('./', '../', '../../', '../../../', '../../../../');
$page = 'login.php';
$pageSuffix = '?expired=yes';
if (isset($_SESSION['selfService_clientDN']) || (strpos($_SERVER['REQUEST_URI'], '/selfService/') !== false)) {
$scope = $_GET['scope'];
$name = $_GET['name'];
if (!preg_match('/^[0-9a-zA-Z _-]+$/', $scope) || !preg_match('/^[0-9a-zA-Z _-]+$/', $name)) {
logNewMessage(LOG_ERR, 'GET parameters invalid: ' . $name . ' ' . $scope);
die();
}
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$page = 'selfServiceLogin.php';
$pageSuffix = '?expired=yes&scope=' . $scope . '&name=' . $name;
}
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for ($i = 0; $i < sizeof($paths); $i++) {
if (file_exists($paths[$i] . $page)) {
$page = $paths[$i] . $page;
break;
}
}
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$page .= $pageSuffix;
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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
$prefix = "LDAP Account Manager (" . session_id() . ' - ' . getClientIPForLogging() . ") - " . $possibleLevels[$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 ($file) {
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$timeZone = 'UTC';
$sysTimeZone = @date_default_timezone_get();
if (!empty($sysTimeZone)) {
$timeZone = $sysTimeZone;
}
$time = new DateTime(null, new DateTimeZone($timeZone));
fwrite($file, $time->format('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.
*
* @param String $scope account type (e.g. user)
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* @return boolean true, if allowed
*/
function checkIfWriteAccessIsAllowed($scope = null) {
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if (!isset($_SESSION['config'])) {
return false;
}
if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_ALL) {
$typeSettings = $_SESSION['config']->get_typeSettings();
if ($scope == null) {
return true;
}
elseif (!isset($typeSettings['readOnly_' . $scope]) || !$typeSettings['readOnly_' . $scope]) {
// check if write for this type is allowed
return true;
}
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}
return false;
}
/**
* Checks if passwords may be changed.
*
* @return boolean true, if allowed
*/
function checkIfPasswordChangeIsAllowed() {
if (!isset($_SESSION['config'])) {
return false;
}
if ($_SESSION['config']->getAccessLevel() >= LAMConfig::ACCESS_PASSWORD_CHANGE) {
return true;
}
return false;
}
/**
* Checks if it is allowed to create new LDAP entries of the given type.
* This also checks if general write access is enabled.
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*
* @param String $scope account type (e.g. 'user')
* @return boolean true, if new entries are allowed
*/
function checkIfNewEntriesAreAllowed($scope) {
if (!isLAMProVersion()) {
return true;
}
if (!isset($_SESSION['config']) || empty($scope)) {
return false;
}
$typeSettings = $_SESSION['config']->get_typeSettings();
if (isset($typeSettings['hideNewButton_' . $scope]) && $typeSettings['hideNewButton_' . $scope]) {
return false;
}
return checkIfWriteAccessIsAllowed();
}
/**
* Checks if it is allowed to delete LDAP entries of the given type.
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*
* @param String $scope account type (e.g. 'user')
* @return boolean true, if entries may be deleted
*/
function checkIfDeleteEntriesIsAllowed($scope) {
if (!isLAMProVersion()) {
return true;
}
if (!isset($_SESSION['config']) || empty($scope)) {
return false;
}
$typeSettings = $_SESSION['config']->get_typeSettings();
if (isset($typeSettings['hideDeleteButton_' . $scope]) && $typeSettings['hideDeleteButton_' . $scope]) {
return false;
}
return checkIfWriteAccessIsAllowed();
}
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/**
* Checks if the password fulfills the password policies.
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*
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* @param String $password password
* @param String $userName user name
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* @param array $otherUserAttrs user's first/last name
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* @return mixed true if ok, string with error message if not valid
*/
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function checkPasswordStrength($password, $userName, $otherUserAttrs) {
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if ($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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$symbols++;
}
}
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$rulesMatched = 0;
$rulesFailed = 0;
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// check lower case
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if (($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.'), $cfg->passwordMinLower);
}
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if ($lower < $cfg->passwordMinLower) {
$rulesFailed++;
}
else {
$rulesMatched++;
}
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// check upper case
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if (($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.'), $cfg->passwordMinUpper);
}
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if ($upper < $cfg->passwordMinUpper) {
$rulesFailed++;
}
else {
$rulesMatched++;
}
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// check numeric
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if (($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.'), $cfg->passwordMinNumeric);
}
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if ($numeric < $cfg->passwordMinNumeric) {
$rulesFailed++;
}
else {
$rulesMatched++;
}
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// check symbols
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if (($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.'), $cfg->passwordMinSymbol);
}
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if ($symbols < $cfg->passwordMinSymbol) {
$rulesFailed++;
}
else {
$rulesMatched++;
}
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// check classes
$classes = 0;
if ($lower > 0) {
$classes++;
}
if ($upper > 0) {
$classes++;
}
if ($numeric > 0) {
$classes++;
}
if ($symbols > 0) {
$classes++;
}
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if (($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).'), $cfg->passwordMinClasses);
}
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if ($classes < $cfg->passwordMinClasses) {
$rulesFailed++;
}
else {
$rulesMatched++;
}
// check rules count
if (($cfg->checkedRulesCount != -1) && ($rulesMatched < $cfg->checkedRulesCount)) {
return sprintf(_('The password is too weak. It needs to match at least %s password complexity rules.'), $cfg->checkedRulesCount);
}
// check user name
if (($cfg->passwordMustNotContainUser == 'true') && !empty($userName)) {
$pwdLow = strtolower($password);
$userLow = strtolower($userName);
if (strpos($pwdLow, $userLow) !== false) {
return _('The password is too weak. You may not use the user name as part of the password.');
}
}
// check part of user name and additional attributes
if (($cfg->passwordMustNotContain3Chars == 'true') && (!empty($userName) || !empty($otherUserAttrs))) {
$pwdLow = strtolower($password);
// check if contains part of user name
if (!empty($userName) && (strlen($userName) > 2)) {
$userLow = strtolower($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.');
}
}
}
}
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return true;
}
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/**
* Checks if the given tool is active.
* Otherwise, an error message is logged and the execution is stopped (die()).
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*
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* @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 ' . $tool . ' denied.');
die();
}
}
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/**
* Returns if the user is logged in.
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*
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* @return boolean is logged in
*/
function isLoggedIn() {
return (isset($_SESSION['loggedIn']) && ($_SESSION['loggedIn'] === true));
}
/**
* Returns the client IP and comma separated proxy IPs if any (HTTP_X_FORWARDED_FOR, HTTP_X_REAL_IP).
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*
* @return String client IP (e.g. 10.10.10.10,11.11.11.11)
*/
function getClientIPForLogging() {
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$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;
}
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/**
* Adds a security token to the session to prevent CSRF attacks.
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*
* @param boolean $overwrite overwrite existing token
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*/
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function addSecurityTokenToSession($overwrite = true) {
if (!empty($_SESSION[getSecurityTokenName()]) && !$overwrite) {
return;
}
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$_SESSION[getSecurityTokenName()] = getRandomNumber();
}
/**
* Checks if the security token from SESSION matches POST data.
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*
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* @param $post use POST, set to false for GET (default: true)
*/
function validateSecurityToken($post = true) {
$vars = $post ? $_POST : $_GET;
if (empty($vars)) {
return;
}
if (empty($vars[getSecurityTokenName()]) || ($vars[getSecurityTokenName()] != $_SESSION[getSecurityTokenName()])) {
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$method = $post ? 'POST' : 'GET';
logNewMessage(LOG_ERR, 'Security token does not match ' . $method . ' data.');
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die();
}
}
/**
* Adds a hidden input field to the given meta HTML table.
* Should be used to add token at the end of table.
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*
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* @param htmlTable|htmlGroup $container table
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*/
function addSecurityTokenToMetaHTML(&$container) {
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$token = new htmlHiddenInput(getSecurityTokenName(), $_SESSION[getSecurityTokenName()]);
$container->addElement($token, true);
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}
/**
* Returns the name of the security token parameter.
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*
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* @return String name
*/
function getSecurityTokenName() {
return 'sec_token';
}
/**
* Returns the value of the security token parameter.
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*
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* @return String value
*/
function getSecurityTokenValue() {
return $_SESSION[getSecurityTokenName()];
}
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/**
* 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\'');
}
}
/**
* Encrypts a string
*
* @param string $data string to encrypt
* @param string $prefix prefix for cookie names
* @return object encrypted string
*/
function lamEncrypt($data, $prefix='') {
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// use OpenSSL if available
if (function_exists('openssl_random_pseudo_bytes')) {
// OpenSSL may have been enabled in a running session
if (!isset($_COOKIE[$prefix . "IV"]) || ($_COOKIE[$prefix . "IV"] == '')) return $data;
if ($_COOKIE[$prefix . "IV"] == "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx") {
return $data;
}
// read key and iv from cookie
$iv = base64_decode($_COOKIE[$prefix . "IV"]);
$key = base64_decode($_COOKIE[$prefix . "Key"]);
// encrypt string
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return openssl_encrypt(base64_encode($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, $prefix='') {
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// use OpenSSL if available
if (function_exists('openssl_random_pseudo_bytes')) {
// OpenSSL may have been enabled in a running session
if (!isset($_COOKIE[$prefix . "IV"]) || ($_COOKIE[$prefix . "IV"] == '')) return $data;
if ($_COOKIE[$prefix . "IV"] == "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx") {
return $data;
}
// read key and iv from cookie
$iv = base64_decode($_COOKIE[$prefix . "IV"]);
$key = base64_decode($_COOKIE[$prefix . "Key"]);
// decrypt string
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$ret = openssl_decrypt($data, lamEncryptionAlgo(), $key, 0, $iv);
$ret = base64_decode(str_replace(chr(00), "", $ret));
return $ret;
}
// otherwise do not decrypt
else {
return $data;
}
}
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/**
* 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';
}
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?>