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<?php
declare(strict_types=1);
namespace PhpMyAdmin;
use PhpMyAdmin\ConfigStorage\Relation;
use PhpMyAdmin\Dbal\DatabaseName;
use PhpMyAdmin\Dbal\TableName;
use PhpMyAdmin\Http\Factory\ServerRequestFactory;
use PhpMyAdmin\Http\ServerRequest;
use PhpMyAdmin\Plugins\AuthenticationPlugin;
use PhpMyAdmin\SqlParser\Lexer;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Webmozart\Assert\Assert;
use Webmozart\Assert\InvalidArgumentException;
use function __;
use function array_pop;
use function count;
use function date_default_timezone_get;
use function date_default_timezone_set;
use function define;
use function defined;
use function explode;
use function extension_loaded;
use function function_exists;
use function hash_equals;
use function htmlspecialchars;
use function implode;
use function ini_get;
use function ini_set;
use function is_array;
use function is_scalar;
use function mb_internal_encoding;
use function mb_strlen;
use function mb_strpos;
use function mb_strrpos;
use function mb_substr;
use function register_shutdown_function;
use function session_id;
use function strlen;
use function trigger_error;
use function urldecode;
use const E_USER_ERROR;
final class Common
{
/**
* Misc stuff and REQUIRED by ALL the scripts.
* MUST be included by every script
*
* Among other things, it contains the advanced authentication work.
*
* Order of sections:
*
* the authentication libraries must be before the connection to db
*
* ... so the required order is:
*
* LABEL_variables_init
* - initialize some variables always needed
* LABEL_parsing_config_file
* - parsing of the configuration file
* LABEL_loading_language_file
* - loading language file
* LABEL_setup_servers
* - check and setup configured servers
* LABEL_theme_setup
* - setting up themes
*
* - load of MySQL extension (if necessary)
* - loading of an authentication library
* - db connection
* - authentication work
*/
public static function run(): void
{
global $containerBuilder, $errorHandler, $config, $server, $dbi, $request;
global $lang, $cfg, $isConfigLoading, $auth_plugin, $route, $theme;
global $urlParams, $isMinimumCommon, $sql_query, $token_mismatch;
$request = ServerRequestFactory::createFromGlobals();
$route = Routing::getCurrentRoute();
if ($route === '/import-status') {
$isMinimumCommon = true;
}
$containerBuilder = Core::getContainerBuilder();
/** @var ErrorHandler $errorHandler */
$errorHandler = $containerBuilder->get('error_handler');
self::checkRequiredPhpExtensions();
self::configurePhpSettings();
self::cleanupPathInfo();
/* parsing configuration file LABEL_parsing_config_file */
/** @var bool $isConfigLoading Indication for the error handler */
$isConfigLoading = false;
register_shutdown_function([Config::class, 'fatalErrorHandler']);
/**
* Force reading of config file, because we removed sensitive values
* in the previous iteration.
*
* @var Config $config
*/
$config = $containerBuilder->get('config');
/**
* include session handling after the globals, to prevent overwriting
*/
if (! defined('PMA_NO_SESSION')) {
Session::setUp($config, $errorHandler);
}
$request = Core::populateRequestWithEncryptedQueryParams($request);
/**
* init some variables LABEL_variables_init
*/
/**
* holds parameters to be passed to next page
*
* @global array $urlParams
*/
$urlParams = [];
$containerBuilder->setParameter('url_params', $urlParams);
self::setGotoAndBackGlobals($containerBuilder, $config);
self::checkTokenRequestParam();
self::setDatabaseAndTableFromRequest($containerBuilder, $request);
/**
* SQL query to be executed
*
* @global string $sql_query
*/
$sql_query = '';
if ($request->isPost()) {
$sql_query = $request->getParsedBodyParam('sql_query', '');
}
$containerBuilder->setParameter('sql_query', $sql_query);
//$_REQUEST['set_theme'] // checked later in this file LABEL_theme_setup
//$_REQUEST['server']; // checked later in this file
//$_REQUEST['lang']; // checked by LABEL_loading_language_file
/* loading language file LABEL_loading_language_file */
/**
* lang detection is done here
*/
$language = LanguageManager::getInstance()->selectLanguage();
$language->activate();
/**
* check for errors occurred while loading configuration
* this check is done here after loading language files to present errors in locale
*/
$config->checkPermissions();
$config->checkErrors();
self::checkServerConfiguration();
self::checkRequest();
/* setup servers LABEL_setup_servers */
$config->checkServers();
/**
* current server
*
* @global integer $server
*/
$server = $config->selectServer();
$urlParams['server'] = $server;
$containerBuilder->setParameter('server', $server);
$containerBuilder->setParameter('url_params', $urlParams);
$cfg = $config->settings;
/* setup themes LABEL_theme_setup */
$theme = ThemeManager::initializeTheme();
/** @var DatabaseInterface $dbi */
$dbi = null;
if (isset($isMinimumCommon)) {
$config->loadUserPreferences();
$containerBuilder->set('theme_manager', ThemeManager::getInstance());
Tracker::enable();
return;
}
/**
* save some settings in cookies
*
* @todo should be done in PhpMyAdmin\Config
*/
$config->setCookie('pma_lang', (string) $lang);
ThemeManager::getInstance()->setThemeCookie();
$dbi = DatabaseInterface::load();
$containerBuilder->set(DatabaseInterface::class, $dbi);
$containerBuilder->setAlias('dbi', DatabaseInterface::class);
if (! empty($cfg['Server'])) {
$config->getLoginCookieValidityFromCache($server);
$auth_plugin = Plugins::getAuthPlugin();
$auth_plugin->authenticate();
/* Enable LOAD DATA LOCAL INFILE for LDI plugin */
if ($route === '/import' && ($_POST['format'] ?? '') === 'ldi') {
// Switch this before the DB connection is done
// phpcs:disable PSR1.Files.SideEffects
define('PMA_ENABLE_LDI', 1);
// phpcs:enable
}
self::connectToDatabaseServer($dbi, $auth_plugin);
$auth_plugin->rememberCredentials();
$auth_plugin->checkTwoFactor();
/* Log success */
Logging::logUser($cfg['Server']['user']);
if ($dbi->getVersion() < $cfg['MysqlMinVersion']['internal']) {
Core::fatalError(
__('You should upgrade to %s %s or later.'),
[
'MySQL',
$cfg['MysqlMinVersion']['human'],
]
);
}
// Sets the default delimiter (if specified).
$sqlDelimiter = $request->getParam('sql_delimiter', '');
if (strlen($sqlDelimiter) > 0) {
// phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
Lexer::$DEFAULT_DELIMITER = $sqlDelimiter;
}
// TODO: Set SQL modes too.
} else { // end server connecting
$response = ResponseRenderer::getInstance();
$response->getHeader()->disableMenuAndConsole();
$response->getFooter()->setMinimal();
}
$response = ResponseRenderer::getInstance();
/**
* There is no point in even attempting to process
* an ajax request if there is a token mismatch
*/
if ($response->isAjax() && $request->isPost() && $token_mismatch) {
$response->setRequestStatus(false);
$response->addJSON(
'message',
Message::error(__('Error: Token mismatch'))
);
exit;
}
Profiling::check($dbi, $response);
$containerBuilder->set('response', ResponseRenderer::getInstance());
// load user preferences
$config->loadUserPreferences();
$containerBuilder->set('theme_manager', ThemeManager::getInstance());
/* Tell tracker that it can actually work */
Tracker::enable();
if (empty($server) || ! isset($cfg['ZeroConf']) || $cfg['ZeroConf'] !== true) {
return;
}
/** @var Relation $relation */
$relation = $containerBuilder->get('relation');
$dbi->postConnectControl($relation);
}
/**
* Checks that required PHP extensions are there.
*/
private static function checkRequiredPhpExtensions(): void
{
/**
* Warning about mbstring.
*/
if (! function_exists('mb_detect_encoding')) {
Core::warnMissingExtension('mbstring');
}
/**
* We really need this one!
*/
if (! function_exists('preg_replace')) {
Core::warnMissingExtension('pcre', true);
}
/**
* JSON is required in several places.
*/
if (! function_exists('json_encode')) {
Core::warnMissingExtension('json', true);
}
/**
* ctype is required for Twig.
*/
if (! function_exists('ctype_alpha')) {
Core::warnMissingExtension('ctype', true);
}
/**
* hash is required for cookie authentication.
*/
if (function_exists('hash_hmac')) {
return;
}
Core::warnMissingExtension('hash', true);
}
/**
* Applies changes to PHP configuration.
*/
private static function configurePhpSettings(): void
{
/**
* Set utf-8 encoding for PHP
*/
ini_set('default_charset', 'utf-8');
mb_internal_encoding('utf-8');
/**
* Set precision to sane value, with higher values
* things behave slightly unexpectedly, for example
* round(1.2, 2) returns 1.199999999999999956.
*/
ini_set('precision', '14');
/**
* check timezone setting
* this could produce an E_WARNING - but only once,
* if not done here it will produce E_WARNING on every date/time function
*/
date_default_timezone_set(@date_default_timezone_get());
}
/**
* PATH_INFO could be compromised if set, so remove it from PHP_SELF
* and provide a clean PHP_SELF here
*/
public static function cleanupPathInfo(): void
{
global $PMA_PHP_SELF;
$PMA_PHP_SELF = Core::getenv('PHP_SELF');
if (empty($PMA_PHP_SELF)) {
$PMA_PHP_SELF = urldecode(Core::getenv('REQUEST_URI'));
}
$_PATH_INFO = Core::getenv('PATH_INFO');
if (! empty($_PATH_INFO) && ! empty($PMA_PHP_SELF)) {
$question_pos = mb_strpos($PMA_PHP_SELF, '?');
if ($question_pos != false) {
$PMA_PHP_SELF = mb_substr($PMA_PHP_SELF, 0, $question_pos);
}
$path_info_pos = mb_strrpos($PMA_PHP_SELF, $_PATH_INFO);
if ($path_info_pos !== false) {
$path_info_part = mb_substr($PMA_PHP_SELF, $path_info_pos, mb_strlen($_PATH_INFO));
if ($path_info_part == $_PATH_INFO) {
$PMA_PHP_SELF = mb_substr($PMA_PHP_SELF, 0, $path_info_pos);
}
}
}
$path = [];
foreach (explode('/', $PMA_PHP_SELF) as $part) {
// ignore parts that have no value
if (empty($part) || $part === '.') {
continue;
}
if ($part !== '..') {
// cool, we found a new part
$path[] = $part;
} elseif (count($path) > 0) {
// going back up? sure
array_pop($path);
}
// Here we intentionall ignore case where we go too up
// as there is nothing sane to do
}
$PMA_PHP_SELF = htmlspecialchars('/' . implode('/', $path));
}
private static function setGotoAndBackGlobals(ContainerInterface $container, Config $config): void
{
global $goto, $back, $urlParams;
// Holds page that should be displayed.
$goto = '';
$container->setParameter('goto', $goto);
if (isset($_REQUEST['goto']) && Core::checkPageValidity($_REQUEST['goto'])) {
$goto = $_REQUEST['goto'];
$urlParams['goto'] = $goto;
$container->setParameter('goto', $goto);
$container->setParameter('url_params', $urlParams);
} else {
if ($config->issetCookie('goto')) {
$config->removeCookie('goto');
}
unset($_REQUEST['goto'], $_GET['goto'], $_POST['goto']);
}
if (isset($_REQUEST['back']) && Core::checkPageValidity($_REQUEST['back'])) {
// Returning page.
$back = $_REQUEST['back'];
$container->setParameter('back', $back);
return;
}
if ($config->issetCookie('back')) {
$config->removeCookie('back');
}
unset($_REQUEST['back'], $_GET['back'], $_POST['back']);
}
/**
* Check whether user supplied token is valid, if not remove any possibly
* dangerous stuff from request.
*
* Check for token mismatch only if the Request method is POST.
* GET Requests would never have token and therefore checking
* mis-match does not make sense.
*/
public static function checkTokenRequestParam(): void
{
global $token_mismatch, $token_provided;
$token_mismatch = true;
$token_provided = false;
if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'POST') {
return;
}
if (isset($_POST['token']) && is_scalar($_POST['token']) && strlen((string) $_POST['token']) > 0) {
$token_provided = true;
$token_mismatch = ! @hash_equals($_SESSION[' PMA_token '], (string) $_POST['token']);
}
if (! $token_mismatch) {
return;
}
// Warn in case the mismatch is result of failed setting of session cookie
if (isset($_POST['set_session']) && $_POST['set_session'] !== session_id()) {
trigger_error(
__(
'Failed to set session cookie. Maybe you are using HTTP instead of HTTPS to access phpMyAdmin.'
),
E_USER_ERROR
);
}
/**
* We don't allow any POST operation parameters if the token is mismatched
* or is not provided.
*/
$allowList = ['ajax_request'];
Sanitize::removeRequestVars($allowList);
}
private static function setDatabaseAndTableFromRequest(
ContainerInterface $containerBuilder,
ServerRequest $request
): void {
global $db, $table, $urlParams;
try {
$db = DatabaseName::fromValue($request->getParam('db'))->getName();
} catch (InvalidArgumentException $exception) {
$db = '';
}
try {
Assert::stringNotEmpty($db);
$table = TableName::fromValue($request->getParam('table'))->getName();
} catch (InvalidArgumentException $exception) {
$table = '';
}
if (! is_array($urlParams)) {
$urlParams = [];
}
$urlParams['db'] = $db;
$urlParams['table'] = $table;
$containerBuilder->setParameter('db', $db);
$containerBuilder->setParameter('table', $table);
$containerBuilder->setParameter('url_params', $urlParams);
}
/**
* Check whether PHP configuration matches our needs.
*/
private static function checkServerConfiguration(): void
{
/**
* As we try to handle charsets by ourself, mbstring overloads just
* break it, see bug 1063821.
*
* We specifically use empty here as we are looking for anything else than
* empty value or 0.
*/
if (extension_loaded('mbstring') && ! empty(ini_get('mbstring.func_overload'))) {
Core::fatalError(
__(
'You have enabled mbstring.func_overload in your PHP '
. 'configuration. This option is incompatible with phpMyAdmin '
. 'and might cause some data to be corrupted!'
)
);
}
/**
* The ini_set and ini_get functions can be disabled using
* disable_functions but we're relying quite a lot of them.
*/
if (function_exists('ini_get') && function_exists('ini_set')) {
return;
}
Core::fatalError(
__(
'The ini_get and/or ini_set functions are disabled in php.ini. phpMyAdmin requires these functions!'
)
);
}
/**
* Checks request and fails with fatal error if something problematic is found
*/
private static function checkRequest(): void
{
if (isset($_REQUEST['GLOBALS']) || isset($_FILES['GLOBALS'])) {
Core::fatalError(__('GLOBALS overwrite attempt'));
}
/**
* protect against possible exploits - there is no need to have so much variables
*/
if (count($_REQUEST) <= 1000) {
return;
}
Core::fatalError(__('possible exploit'));
}
private static function connectToDatabaseServer(DatabaseInterface $dbi, AuthenticationPlugin $auth): void
{
global $cfg;
/**
* Try to connect MySQL with the control user profile (will be used to get the privileges list for the current
* user but the true user link must be open after this one so it would be default one for all the scripts).
*/
$controlLink = false;
if ($cfg['Server']['controluser'] !== '') {
$controlLink = $dbi->connect(DatabaseInterface::CONNECT_CONTROL);
}
// Connects to the server (validates user's login)
$userLink = $dbi->connect(DatabaseInterface::CONNECT_USER);
if ($userLink === false) {
$auth->showFailure('mysql-denied');
}
if ($controlLink) {
return;
}
/**
* Open separate connection for control queries, this is needed to avoid problems with table locking used in
* main connection and phpMyAdmin issuing queries to configuration storage, which is not locked by that time.
*/
$dbi->connect(DatabaseInterface::CONNECT_USER, null, DatabaseInterface::CONNECT_CONTROL);
}
}