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<?php
/**
* HTTP Authentication plugin for phpMyAdmin.
* NOTE: Requires PHP loaded as a Apache module.
*/
declare(strict_types=1);
namespace PhpMyAdmin\Plugins\Auth;
use PhpMyAdmin\Config;
use PhpMyAdmin\Core;
use PhpMyAdmin\Message;
use PhpMyAdmin\Plugins\AuthenticationPlugin;
use PhpMyAdmin\ResponseRenderer;
use function __;
use function base64_decode;
use function defined;
use function hash_equals;
use function preg_replace;
use function sprintf;
use function strcmp;
use function strpos;
use function substr;
/**
* Handles the HTTP authentication methods
*/
class AuthenticationHttp extends AuthenticationPlugin
{
/**
* Displays authentication form and redirect as necessary
*
* @return bool always true (no return indeed)
*/
public function showLoginForm(): bool
{
$response = ResponseRenderer::getInstance();
if ($response->isAjax()) {
$response->setRequestStatus(false);
// reload_flag removes the token parameter from the URL and reloads
$response->addJSON('reload_flag', '1');
if (defined('TESTSUITE')) {
return true;
}
exit;
}
return $this->authForm();
}
/**
* Displays authentication form
*/
public function authForm(): bool
{
if (empty($GLOBALS['cfg']['Server']['auth_http_realm'])) {
if (empty($GLOBALS['cfg']['Server']['verbose'])) {
$server_message = $GLOBALS['cfg']['Server']['host'];
} else {
$server_message = $GLOBALS['cfg']['Server']['verbose'];
}
$realm_message = 'phpMyAdmin ' . $server_message;
} else {
$realm_message = $GLOBALS['cfg']['Server']['auth_http_realm'];
}
$response = ResponseRenderer::getInstance();
// remove non US-ASCII to respect RFC2616
$realm_message = preg_replace('/[^\x20-\x7e]/i', '', $realm_message);
$response->header('WWW-Authenticate: Basic realm="' . $realm_message . '"');
$response->setHttpResponseCode(401);
/* HTML header */
$footer = $response->getFooter();
$footer->setMinimal();
$header = $response->getHeader();
$header->setTitle(__('Access denied!'));
$header->disableMenuAndConsole();
$header->setBodyId('loginform');
$response->addHTML('<h1>');
$response->addHTML(sprintf(__('Welcome to %s'), ' phpMyAdmin'));
$response->addHTML('</h1>');
$response->addHTML('<h3>');
$response->addHTML(
Message::error(
__('Wrong username/password. Access denied.')
)->getDisplay()
);
$response->addHTML('</h3>');
$response->addHTML(Config::renderFooter());
if (! defined('TESTSUITE')) {
exit;
}
return false;
}
/**
* Gets authentication credentials
*/
public function readCredentials(): bool
{
// Grabs the $PHP_AUTH_USER variable
if (isset($GLOBALS['PHP_AUTH_USER'])) {
$this->user = $GLOBALS['PHP_AUTH_USER'];
}
if (empty($this->user)) {
if (Core::getenv('PHP_AUTH_USER')) {
$this->user = Core::getenv('PHP_AUTH_USER');
} elseif (Core::getenv('REMOTE_USER')) {
// CGI, might be encoded, see below
$this->user = Core::getenv('REMOTE_USER');
} elseif (Core::getenv('REDIRECT_REMOTE_USER')) {
// CGI, might be encoded, see below
$this->user = Core::getenv('REDIRECT_REMOTE_USER');
} elseif (Core::getenv('AUTH_USER')) {
// WebSite Professional
$this->user = Core::getenv('AUTH_USER');
} elseif (Core::getenv('HTTP_AUTHORIZATION')) {
// IIS, might be encoded, see below
$this->user = Core::getenv('HTTP_AUTHORIZATION');
} elseif (Core::getenv('Authorization')) {
// FastCGI, might be encoded, see below
$this->user = Core::getenv('Authorization');
}
}
// Grabs the $PHP_AUTH_PW variable
if (isset($GLOBALS['PHP_AUTH_PW'])) {
$this->password = $GLOBALS['PHP_AUTH_PW'];
}
if (empty($this->password)) {
if (Core::getenv('PHP_AUTH_PW')) {
$this->password = Core::getenv('PHP_AUTH_PW');
} elseif (Core::getenv('REMOTE_PASSWORD')) {
// Apache/CGI
$this->password = Core::getenv('REMOTE_PASSWORD');
} elseif (Core::getenv('AUTH_PASSWORD')) {
// WebSite Professional
$this->password = Core::getenv('AUTH_PASSWORD');
}
}
// Sanitize empty password login
if ($this->password === null) {
$this->password = '';
}
// Avoid showing the password in phpinfo()'s output
unset($GLOBALS['PHP_AUTH_PW'], $_SERVER['PHP_AUTH_PW']);
// Decode possibly encoded information (used by IIS/CGI/FastCGI)
// (do not use explode() because a user might have a colon in their password
if (strcmp(substr($this->user, 0, 6), 'Basic ') == 0) {
$usr_pass = base64_decode(substr($this->user, 6));
if (! empty($usr_pass)) {
$colon = strpos($usr_pass, ':');
if ($colon) {
$this->user = substr($usr_pass, 0, $colon);
$this->password = substr($usr_pass, $colon + 1);
}
unset($colon);
}
unset($usr_pass);
}
// sanitize username
$this->user = Core::sanitizeMySQLUser($this->user);
// User logged out -> ensure the new username is not the same
$old_usr = $_REQUEST['old_usr'] ?? '';
if (! empty($old_usr) && (isset($this->user) && hash_equals($old_usr, $this->user))) {
$this->user = '';
}
// Returns whether we get authentication settings or not
return ! empty($this->user);
}
/**
* User is not allowed to login to MySQL -> authentication failed
*
* @param string $failure String describing why authentication has failed
*/
public function showFailure($failure): void
{
global $dbi;
parent::showFailure($failure);
$error = $dbi->getError();
if ($error && $GLOBALS['errno'] != 1045) {
Core::fatalError($error);
} else {
$this->authForm();
}
}
/**
* Returns URL for login form.
*
* @return string
*/
public function getLoginFormURL()
{
return './index.php?route=/&old_usr=' . $this->user;
}
}
|
