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<?php
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/**
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* Abstract class for the authentication plugins
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*/
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declare(strict_types=1);
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namespace PhpMyAdmin\Plugins;
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use PhpMyAdmin\Config;
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use PhpMyAdmin\Core;
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use PhpMyAdmin\IpAllowDeny;
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use PhpMyAdmin\Logging;
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use PhpMyAdmin\Message;
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use PhpMyAdmin\ResponseRenderer;
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use PhpMyAdmin\Session;
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use PhpMyAdmin\Template;
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use PhpMyAdmin\TwoFactor;
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use PhpMyAdmin\Url;
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use PhpMyAdmin\Util;
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use function __;
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use function array_keys;
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use function defined;
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use function htmlspecialchars;
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use function intval;
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use function max;
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use function min;
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use function session_destroy;
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use function session_unset;
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use function sprintf;
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use function time;
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/**
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* Provides a common interface that will have to be implemented by all of the
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* authentication plugins.
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*/
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abstract class AuthenticationPlugin
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{
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/**
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* Username
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*
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* @var string
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*/
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public $user = '';
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/**
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* Password
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*
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* @var string
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*/
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public $password = '';
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/** @var IpAllowDeny */
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protected $ipAllowDeny;
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/** @var Template */
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public $template;
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public function __construct()
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{
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$this->ipAllowDeny = new IpAllowDeny();
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$this->template = new Template();
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}
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/**
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* Displays authentication form
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*/
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abstract public function showLoginForm(): bool;
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/**
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* Gets authentication credentials
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*/
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abstract public function readCredentials(): bool;
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/**
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* Set the user and password after last checkings if required
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*/
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public function storeCredentials(): bool
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{
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global $cfg;
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$this->setSessionAccessTime();
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$cfg['Server']['user'] = $this->user;
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$cfg['Server']['password'] = $this->password;
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return true;
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}
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/**
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* Stores user credentials after successful login.
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*/
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public function rememberCredentials(): void
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{
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}
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/**
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* User is not allowed to login to MySQL -> authentication failed
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*
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* @param string $failure String describing why authentication has failed
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*/
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public function showFailure($failure): void
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{
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Logging::logUser($this->user, $failure);
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}
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/**
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* Perform logout
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*/
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public function logOut(): void
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{
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global $config;
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/* Obtain redirect URL (before doing logout) */
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if (! empty($GLOBALS['cfg']['Server']['LogoutURL'])) {
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$redirect_url = $GLOBALS['cfg']['Server']['LogoutURL'];
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} else {
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$redirect_url = $this->getLoginFormURL();
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}
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/* Clear credentials */
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$this->user = '';
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$this->password = '';
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/*
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* Get a logged-in server count in case of LoginCookieDeleteAll is disabled.
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*/
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$server = 0;
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if ($GLOBALS['cfg']['LoginCookieDeleteAll'] === false && $GLOBALS['cfg']['Server']['auth_type'] === 'cookie') {
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foreach (array_keys($GLOBALS['cfg']['Servers']) as $key) {
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if (! $config->issetCookie('pmaAuth-' . $key)) {
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continue;
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}
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$server = $key;
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}
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}
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if ($server === 0) {
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/* delete user's choices that were stored in session */
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if (! defined('TESTSUITE')) {
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session_unset();
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session_destroy();
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}
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/* Redirect to login form (or configured URL) */
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Core::sendHeaderLocation($redirect_url);
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} else {
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/* Redirect to other authenticated server */
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$_SESSION['partial_logout'] = true;
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Core::sendHeaderLocation(
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'./index.php?route=/' . Url::getCommonRaw(['server' => $server], '&')
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);
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}
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}
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/**
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* Returns URL for login form.
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*
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* @return string
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*/
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public function getLoginFormURL()
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{
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return './index.php?route=/';
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}
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/**
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* Returns error message for failed authentication.
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*
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* @param string $failure String describing why authentication has failed
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*
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* @return string
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*/
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public function getErrorMessage($failure)
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{
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global $dbi;
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if ($failure === 'empty-denied') {
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return __('Login without a password is forbidden by configuration (see AllowNoPassword)');
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}
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if ($failure === 'root-denied' || $failure === 'allow-denied') {
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return __('Access denied!');
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}
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if ($failure === 'no-activity') {
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return sprintf(
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__('You have been automatically logged out due to inactivity of %s seconds.'
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. ' Once you log in again, you should be able to resume the work where you left off.'),
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intval($GLOBALS['cfg']['LoginCookieValidity'])
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);
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}
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$dbi_error = $dbi->getError();
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if (! empty($dbi_error)) {
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return htmlspecialchars($dbi_error);
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}
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if (isset($GLOBALS['errno'])) {
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return '#' . $GLOBALS['errno'] . ' '
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. __('Cannot log in to the MySQL server');
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}
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return __('Cannot log in to the MySQL server');
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}
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/**
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* Callback when user changes password.
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*
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* @param string $password New password to set
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*/
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public function handlePasswordChange($password): void
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{
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}
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/**
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* Store session access time in session.
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*
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* Tries to workaround PHP 5 session garbage collection which
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* looks at the session file's last modified time
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*/
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public function setSessionAccessTime(): void
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{
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if (isset($_REQUEST['guid'])) {
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$guid = (string) $_REQUEST['guid'];
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} else {
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$guid = 'default';
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}
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if (isset($_REQUEST['access_time'])) {
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// Ensure access_time is in range <0, LoginCookieValidity + 1>
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// to avoid excessive extension of validity.
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//
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// Negative values can cause session expiry extension
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// Too big values can cause overflow and lead to same
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$time = time() - min(max(0, intval($_REQUEST['access_time'])), $GLOBALS['cfg']['LoginCookieValidity'] + 1);
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} else {
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$time = time();
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}
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$_SESSION['browser_access_time'][$guid] = $time;
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}
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/**
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* High level authentication interface
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*
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* Gets the credentials or shows login form if necessary
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*/
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public function authenticate(): void
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{
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$success = $this->readCredentials();
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/* Show login form (this exits) */
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if (! $success) {
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/* Force generating of new session */
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Session::secure();
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$this->showLoginForm();
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}
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/* Store credentials (eg. in cookies) */
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$this->storeCredentials();
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/* Check allow/deny rules */
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$this->checkRules();
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/* clear user cache */
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Util::clearUserCache();
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}
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/**
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* Check configuration defined restrictions for authentication
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*/
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public function checkRules(): void
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{
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global $cfg;
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// Check IP-based Allow/Deny rules as soon as possible to reject the
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// user based on mod_access in Apache
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if (isset($cfg['Server']['AllowDeny']['order'])) {
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$allowDeny_forbidden = false; // default
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if ($cfg['Server']['AllowDeny']['order'] === 'allow,deny') {
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$allowDeny_forbidden = true;
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if ($this->ipAllowDeny->allow()) {
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$allowDeny_forbidden = false;
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}
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if ($this->ipAllowDeny->deny()) {
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$allowDeny_forbidden = true;
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}
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} elseif ($cfg['Server']['AllowDeny']['order'] === 'deny,allow') {
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if ($this->ipAllowDeny->deny()) {
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$allowDeny_forbidden = true;
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}
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if ($this->ipAllowDeny->allow()) {
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$allowDeny_forbidden = false;
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}
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} elseif ($cfg['Server']['AllowDeny']['order'] === 'explicit') {
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if ($this->ipAllowDeny->allow() && ! $this->ipAllowDeny->deny()) {
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$allowDeny_forbidden = false;
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} else {
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$allowDeny_forbidden = true;
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}
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}
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// Ejects the user if banished
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if ($allowDeny_forbidden) {
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$this->showFailure('allow-denied');
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}
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}
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// is root allowed?
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if (! $cfg['Server']['AllowRoot'] && $cfg['Server']['user'] === 'root') {
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$this->showFailure('root-denied');
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}
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// is a login without password allowed?
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if ($cfg['Server']['AllowNoPassword'] || $cfg['Server']['password'] !== '') {
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return;
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}
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$this->showFailure('empty-denied');
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}
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/**
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* Checks whether two factor authentication is active
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* for given user and performs it.
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*/
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public function checkTwoFactor(): void
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{
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$twofactor = new TwoFactor($this->user);
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/* Do we need to show the form? */
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if ($twofactor->check()) {
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return;
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}
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$response = ResponseRenderer::getInstance();
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if ($response->loginPage()) {
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if (defined('TESTSUITE')) {
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return;
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}
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exit;
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}
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echo $this->template->render('login/header');
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echo Message::rawNotice(
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__('You have enabled two factor authentication, please confirm your login.')
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)->getDisplay();
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echo $this->template->render('login/twofactor', [
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'form' => $twofactor->render(),
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'show_submit' => $twofactor->showSubmit(),
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]);
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echo $this->template->render('login/footer');
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echo Config::renderFooter();
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if (! defined('TESTSUITE')) {
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exit;
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}
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}
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}
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