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<?php
/**
* Cookie Authentication plugin for phpMyAdmin
*/
declare(strict_types=1);
namespace PhpMyAdmin\Plugins\Auth;
use PhpMyAdmin\Config;
use PhpMyAdmin\Core;
use PhpMyAdmin\LanguageManager;
use PhpMyAdmin\Message;
use PhpMyAdmin\Plugins\AuthenticationPlugin;
use PhpMyAdmin\ResponseRenderer;
use PhpMyAdmin\Server\Select;
use PhpMyAdmin\Session;
use PhpMyAdmin\Url;
use PhpMyAdmin\Util;
use PhpMyAdmin\Utils\SessionCache;
use ReCaptcha;
use Throwable;
use function __;
use function array_keys;
use function base64_decode;
use function base64_encode;
use function count;
use function defined;
use function explode;
use function function_exists;
use function in_array;
use function ini_get;
use function intval;
use function is_array;
use function is_string;
use function json_decode;
use function json_encode;
use function mb_strlen;
use function mb_substr;
use function preg_match;
use function random_bytes;
use function session_id;
use function sodium_crypto_secretbox;
use function sodium_crypto_secretbox_open;
use function strlen;
use function time;
use const SODIUM_CRYPTO_SECRETBOX_KEYBYTES;
use const SODIUM_CRYPTO_SECRETBOX_NONCEBYTES;
/**
* Handles the cookie authentication method
*/
class AuthenticationCookie extends AuthenticationPlugin
{
/**
* Displays authentication form
*
* this function MUST exit/quit the application
*
* @global string $conn_error the last connection error
*/
public function showLoginForm(): bool
{
global $conn_error, $route;
$response = ResponseRenderer::getInstance();
/**
* When sending login modal after session has expired, send the
* new token explicitly with the response to update the token
* in all the forms having a hidden token.
*/
$session_expired = isset($_REQUEST['check_timeout']) || isset($_REQUEST['session_timedout']);
if (! $session_expired && $response->loginPage()) {
if (defined('TESTSUITE')) {
return true;
}
exit;
}
/**
* When sending login modal after session has expired, send the
* new token explicitly with the response to update the token
* in all the forms having a hidden token.
*/
if ($session_expired) {
$response->setRequestStatus(false);
$response->addJSON('new_token', $_SESSION[' PMA_token ']);
}
/**
* logged_in response parameter is used to check if the login,
* using the modal was successful after session expiration.
*/
if (isset($_REQUEST['session_timedout'])) {
$response->addJSON('logged_in', 0);
}
// No recall if blowfish secret is not configured as it would produce
// garbage
if ($GLOBALS['cfg']['LoginCookieRecall'] && ! empty($GLOBALS['cfg']['blowfish_secret'])) {
$default_user = $this->user;
$default_server = $GLOBALS['pma_auth_server'];
$hasAutocomplete = true;
} else {
$default_user = '';
$default_server = '';
$hasAutocomplete = false;
}
// wrap the login form in a div which overlays the whole page.
if ($session_expired) {
$loginHeader = $this->template->render('login/header', [
'add_class' => ' modal_form',
'session_expired' => 1,
]);
} else {
$loginHeader = $this->template->render('login/header', [
'add_class' => '',
'session_expired' => 0,
]);
}
$errorMessages = '';
// Show error message
if (! empty($conn_error)) {
$errorMessages = Message::rawError((string) $conn_error)->getDisplay();
} elseif (isset($_GET['session_expired']) && intval($_GET['session_expired']) == 1) {
$errorMessages = Message::rawError(
__('Your session has expired. Please log in again.')
)->getDisplay();
}
$languageManager = LanguageManager::getInstance();
$availableLanguages = [];
if (empty($GLOBALS['cfg']['Lang']) && $languageManager->hasChoice()) {
$availableLanguages = $languageManager->sortedLanguages();
}
$serversOptions = '';
$hasServers = count($GLOBALS['cfg']['Servers']) > 1;
if ($hasServers) {
$serversOptions = Select::render(false, false);
}
$_form_params = [];
if (isset($route)) {
$_form_params['route'] = $route;
}
if (strlen($GLOBALS['db'])) {
$_form_params['db'] = $GLOBALS['db'];
}
if (strlen($GLOBALS['table'])) {
$_form_params['table'] = $GLOBALS['table'];
}
$errors = '';
if ($GLOBALS['errorHandler']->hasDisplayErrors()) {
$errors = $GLOBALS['errorHandler']->getDispErrors();
}
// close the wrapping div tag, if the request is after session timeout
if ($session_expired) {
$loginFooter = $this->template->render('login/footer', ['session_expired' => 1]);
} else {
$loginFooter = $this->template->render('login/footer', ['session_expired' => 0]);
}
$configFooter = Config::renderFooter();
echo $this->template->render('login/form', [
'login_header' => $loginHeader,
'is_demo' => $GLOBALS['cfg']['DBG']['demo'],
'error_messages' => $errorMessages,
'available_languages' => $availableLanguages,
'is_session_expired' => $session_expired,
'has_autocomplete' => $hasAutocomplete,
'session_id' => session_id(),
'is_arbitrary_server_allowed' => $GLOBALS['cfg']['AllowArbitraryServer'],
'default_server' => $default_server,
'default_user' => $default_user,
'has_servers' => $hasServers,
'server_options' => $serversOptions,
'server' => $GLOBALS['server'],
'lang' => $GLOBALS['lang'],
'has_captcha' => ! empty($GLOBALS['cfg']['CaptchaApi'])
&& ! empty($GLOBALS['cfg']['CaptchaRequestParam'])
&& ! empty($GLOBALS['cfg']['CaptchaResponseParam'])
&& ! empty($GLOBALS['cfg']['CaptchaLoginPrivateKey'])
&& ! empty($GLOBALS['cfg']['CaptchaLoginPublicKey']),
'use_captcha_checkbox' => ($GLOBALS['cfg']['CaptchaMethod'] ?? '') === 'checkbox',
'captcha_api' => $GLOBALS['cfg']['CaptchaApi'],
'captcha_req' => $GLOBALS['cfg']['CaptchaRequestParam'],
'captcha_resp' => $GLOBALS['cfg']['CaptchaResponseParam'],
'captcha_key' => $GLOBALS['cfg']['CaptchaLoginPublicKey'],
'form_params' => $_form_params,
'errors' => $errors,
'login_footer' => $loginFooter,
'config_footer' => $configFooter,
]);
if (! defined('TESTSUITE')) {
exit;
}
return true;
}
/**
* Gets authentication credentials
*
* this function DOES NOT check authentication - it just checks/provides
* authentication credentials required to connect to the MySQL server
* usually with $dbi->connect()
*
* it returns false if something is missing - which usually leads to
* showLoginForm() which displays login form
*
* it returns true if all seems ok which usually leads to auth_set_user()
*
* it directly switches to showFailure() if user inactivity timeout is reached
*/
public function readCredentials(): bool
{
global $conn_error;
// Initialization
/**
* @global $GLOBALS['pma_auth_server'] the user provided server to
* connect to
*/
$GLOBALS['pma_auth_server'] = '';
$this->user = $this->password = '';
$GLOBALS['from_cookie'] = false;
if (isset($_POST['pma_username']) && strlen($_POST['pma_username']) > 0) {
// Verify Captcha if it is required.
if (
! empty($GLOBALS['cfg']['CaptchaApi'])
&& ! empty($GLOBALS['cfg']['CaptchaRequestParam'])
&& ! empty($GLOBALS['cfg']['CaptchaResponseParam'])
&& ! empty($GLOBALS['cfg']['CaptchaLoginPrivateKey'])
&& ! empty($GLOBALS['cfg']['CaptchaLoginPublicKey'])
) {
if (empty($_POST[$GLOBALS['cfg']['CaptchaResponseParam']])) {
$conn_error = __('Missing reCAPTCHA verification, maybe it has been blocked by adblock?');
return false;
}
$captchaSiteVerifyURL = $GLOBALS['cfg']['CaptchaSiteVerifyURL'] ?? '';
$captchaSiteVerifyURL = empty($captchaSiteVerifyURL) ? null : $captchaSiteVerifyURL;
if (function_exists('curl_init')) {
$reCaptcha = new ReCaptcha\ReCaptcha(
$GLOBALS['cfg']['CaptchaLoginPrivateKey'],
new ReCaptcha\RequestMethod\CurlPost(null, $captchaSiteVerifyURL)
);
} elseif (ini_get('allow_url_fopen')) {
$reCaptcha = new ReCaptcha\ReCaptcha(
$GLOBALS['cfg']['CaptchaLoginPrivateKey'],
new ReCaptcha\RequestMethod\Post($captchaSiteVerifyURL)
);
} else {
$reCaptcha = new ReCaptcha\ReCaptcha(
$GLOBALS['cfg']['CaptchaLoginPrivateKey'],
new ReCaptcha\RequestMethod\SocketPost(null, $captchaSiteVerifyURL)
);
}
// verify captcha status.
$resp = $reCaptcha->verify(
$_POST[$GLOBALS['cfg']['CaptchaResponseParam']],
Core::getIp()
);
// Check if the captcha entered is valid, if not stop the login.
if ($resp == null || ! $resp->isSuccess()) {
$codes = $resp->getErrorCodes();
if (in_array('invalid-json', $codes)) {
$conn_error = __('Failed to connect to the reCAPTCHA service!');
} else {
$conn_error = __('Entered captcha is wrong, try again!');
}
return false;
}
}
// The user just logged in
$this->user = Core::sanitizeMySQLUser($_POST['pma_username']);
$password = $_POST['pma_password'] ?? '';
if (strlen($password) >= 1000) {
$conn_error = __('Your password is too long. To prevent denial-of-service attacks, ' .
'phpMyAdmin restricts passwords to less than 1000 characters.');
return false;
}
$this->password = $password;
if ($GLOBALS['cfg']['AllowArbitraryServer'] && isset($_REQUEST['pma_servername'])) {
if ($GLOBALS['cfg']['ArbitraryServerRegexp']) {
$parts = explode(' ', $_REQUEST['pma_servername']);
if (count($parts) === 2) {
$tmp_host = $parts[0];
} else {
$tmp_host = $_REQUEST['pma_servername'];
}
$match = preg_match($GLOBALS['cfg']['ArbitraryServerRegexp'], $tmp_host);
if (! $match) {
$conn_error = __('You are not allowed to log in to this MySQL server!');
return false;
}
}
$GLOBALS['pma_auth_server'] = Core::sanitizeMySQLHost($_REQUEST['pma_servername']);
}
/* Secure current session on login to avoid session fixation */
Session::secure();
return true;
}
// At the end, try to set the $this->user
// and $this->password variables from cookies
// check cookies
$serverCookie = $GLOBALS['config']->getCookie('pmaUser-' . $GLOBALS['server']);
if (empty($serverCookie)) {
return false;
}
$value = $this->cookieDecrypt(
$serverCookie,
$this->getEncryptionSecret()
);
if ($value === null) {
return false;
}
$this->user = $value;
// user was never logged in since session start
if (empty($_SESSION['browser_access_time'])) {
return false;
}
// User inactive too long
$last_access_time = time() - $GLOBALS['cfg']['LoginCookieValidity'];
foreach ($_SESSION['browser_access_time'] as $key => $value) {
if ($value >= $last_access_time) {
continue;
}
unset($_SESSION['browser_access_time'][$key]);
}
// All sessions expired
if (empty($_SESSION['browser_access_time'])) {
SessionCache::remove('is_create_db_priv');
SessionCache::remove('is_reload_priv');
SessionCache::remove('db_to_create');
SessionCache::remove('dbs_where_create_table_allowed');
SessionCache::remove('dbs_to_test');
SessionCache::remove('db_priv');
SessionCache::remove('col_priv');
SessionCache::remove('table_priv');
SessionCache::remove('proc_priv');
$this->showFailure('no-activity');
if (! defined('TESTSUITE')) {
exit;
}
return false;
}
// check password cookie
$serverCookie = $GLOBALS['config']->getCookie('pmaAuth-' . $GLOBALS['server']);
if (empty($serverCookie)) {
return false;
}
$value = $this->cookieDecrypt(
$serverCookie,
$this->getSessionEncryptionSecret()
);
if ($value === null) {
return false;
}
$auth_data = json_decode($value, true);
if (! is_array($auth_data) || ! isset($auth_data['password'])) {
return false;
}
$this->password = $auth_data['password'];
if ($GLOBALS['cfg']['AllowArbitraryServer'] && ! empty($auth_data['server'])) {
$GLOBALS['pma_auth_server'] = $auth_data['server'];
}
$GLOBALS['from_cookie'] = true;
return true;
}
/**
* Set the user and password after last checkings if required
*
* @return bool always true
*/
public function storeCredentials(): bool
{
global $cfg;
if ($GLOBALS['cfg']['AllowArbitraryServer'] && ! empty($GLOBALS['pma_auth_server'])) {
/* Allow to specify 'host port' */
$parts = explode(' ', $GLOBALS['pma_auth_server']);
if (count($parts) === 2) {
$tmp_host = $parts[0];
$tmp_port = $parts[1];
} else {
$tmp_host = $GLOBALS['pma_auth_server'];
$tmp_port = '';
}
if ($cfg['Server']['host'] != $GLOBALS['pma_auth_server']) {
$cfg['Server']['host'] = $tmp_host;
if (! empty($tmp_port)) {
$cfg['Server']['port'] = $tmp_port;
}
}
unset($tmp_host, $tmp_port, $parts);
}
return parent::storeCredentials();
}
/**
* Stores user credentials after successful login.
*/
public function rememberCredentials(): void
{
global $route;
// Name and password cookies need to be refreshed each time
// Duration = one month for username
$this->storeUsernameCookie($this->user);
// Duration = as configured
// Do not store password cookie on password change as we will
// set the cookie again after password has been changed
if (! isset($_POST['change_pw'])) {
$this->storePasswordCookie($this->password);
}
// any parameters to pass?
$url_params = [];
if (isset($route)) {
$url_params['route'] = $route;
}
if (strlen($GLOBALS['db']) > 0) {
$url_params['db'] = $GLOBALS['db'];
}
if (strlen($GLOBALS['table']) > 0) {
$url_params['table'] = $GLOBALS['table'];
}
// user logged in successfully after session expiration
if (isset($_REQUEST['session_timedout'])) {
$response = ResponseRenderer::getInstance();
$response->addJSON('logged_in', 1);
$response->addJSON('success', 1);
$response->addJSON('new_token', $_SESSION[' PMA_token ']);
if (! defined('TESTSUITE')) {
exit;
}
return;
}
// Set server cookies if required (once per session) and, in this case,
// force reload to ensure the client accepts cookies
if ($GLOBALS['from_cookie']) {
return;
}
/**
* Clear user cache.
*/
Util::clearUserCache();
ResponseRenderer::getInstance()->disable();
Core::sendHeaderLocation(
'./index.php?route=/' . Url::getCommonRaw($url_params, '&'),
true
);
if (! defined('TESTSUITE')) {
exit;
}
}
/**
* Stores username in a cookie.
*
* @param string $username User name
*/
public function storeUsernameCookie($username): void
{
// Name and password cookies need to be refreshed each time
// Duration = one month for username
$GLOBALS['config']->setCookie(
'pmaUser-' . $GLOBALS['server'],
$this->cookieEncrypt(
$username,
$this->getEncryptionSecret()
)
);
}
/**
* Stores password in a cookie.
*
* @param string $password Password
*/
public function storePasswordCookie($password): void
{
$payload = ['password' => $password];
if ($GLOBALS['cfg']['AllowArbitraryServer'] && ! empty($GLOBALS['pma_auth_server'])) {
$payload['server'] = $GLOBALS['pma_auth_server'];
}
// Duration = as configured
$GLOBALS['config']->setCookie(
'pmaAuth-' . $GLOBALS['server'],
$this->cookieEncrypt(
(string) json_encode($payload),
$this->getSessionEncryptionSecret()
),
null,
(int) $GLOBALS['cfg']['LoginCookieStore']
);
}
/**
* User is not allowed to login to MySQL -> authentication failed
*
* prepares error message and switches to showLoginForm() which display the error
* and the login form
*
* this function MUST exit/quit the application,
* currently done by call to showLoginForm()
*
* @param string $failure String describing why authentication has failed
*/
public function showFailure($failure): void
{
global $conn_error;
parent::showFailure($failure);
// Deletes password cookie and displays the login form
$GLOBALS['config']->removeCookie('pmaAuth-' . $GLOBALS['server']);
$conn_error = $this->getErrorMessage($failure);
$response = ResponseRenderer::getInstance();
// needed for PHP-CGI (not need for FastCGI or mod-php)
$response->header('Cache-Control: no-store, no-cache, must-revalidate');
$response->header('Pragma: no-cache');
$this->showLoginForm();
}
/**
* Returns blowfish secret or generates one if needed.
*/
private function getEncryptionSecret(): string
{
$key = $GLOBALS['cfg']['blowfish_secret'] ?? null;
if (is_string($key) && mb_strlen($key, '8bit') === SODIUM_CRYPTO_SECRETBOX_KEYBYTES) {
return $key;
}
return $this->getSessionEncryptionSecret();
}
/**
* Returns blowfish secret or generates one if needed.
*/
private function getSessionEncryptionSecret(): string
{
$key = $_SESSION['encryption_key'] ?? null;
if (is_string($key) && mb_strlen($key, '8bit') === SODIUM_CRYPTO_SECRETBOX_KEYBYTES) {
return $key;
}
$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);
$_SESSION['encryption_key'] = $key;
return $key;
}
public function cookieEncrypt(string $data, string $secret): string
{
try {
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox($data, $nonce, $secret);
} catch (Throwable $throwable) {
return '';
}
return base64_encode($nonce . $ciphertext);
}
public function cookieDecrypt(string $encryptedData, string $secret): ?string
{
$encrypted = base64_decode($encryptedData);
$nonce = mb_substr($encrypted, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit');
$ciphertext = mb_substr($encrypted, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit');
try {
$decrypted = sodium_crypto_secretbox_open($ciphertext, $nonce, $secret);
} catch (Throwable $throwable) {
return null;
}
if (! is_string($decrypted)) {
return null;
}
return $decrypted;
}
/**
* Callback when user changes password.
*
* @param string $password New password to set
*/
public function handlePasswordChange($password): void
{
$this->storePasswordCookie($password);
}
/**
* Perform logout
*/
public function logOut(): void
{
global $config;
// -> delete password cookie(s)
if ($GLOBALS['cfg']['LoginCookieDeleteAll']) {
foreach (array_keys($GLOBALS['cfg']['Servers']) as $key) {
$config->removeCookie('pmaAuth-' . $key);
if (! $config->issetCookie('pmaAuth-' . $key)) {
continue;
}
$config->removeCookie('pmaAuth-' . $key);
}
} else {
$cookieName = 'pmaAuth-' . $GLOBALS['server'];
$config->removeCookie($cookieName);
if ($config->issetCookie($cookieName)) {
$config->removeCookie($cookieName);
}
}
parent::logOut();
}
}