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<?php
/**
* Single signon for phpMyAdmin using OpenID
*
* This is just example how to use single signon with phpMyAdmin, it is
* not intended to be perfect code and look, only shows how you can
* integrate this functionality in your application.
*
* It uses OpenID pear package, see https://pear.php.net/package/OpenID
*
* User first authenticates using OpenID and based on content of $AUTH_MAP
* the login information is passed to phpMyAdmin in session data.
*/
declare(strict_types=1);
if (false === @include_once 'OpenID/RelyingParty.php') {
exit;
}
/* Change this to true if using phpMyAdmin over https */
$secure_cookie = false;
/**
* Map of authenticated users to MySQL user/password pairs.
*/
$AUTH_MAP = [
'https://launchpad.net/~username' => [
'user' => 'root',
'password' => '',
],
];
// phpcs:disable PSR1.Files.SideEffects,Squiz.Functions.GlobalFunction
/**
* Simple function to show HTML page with given content.
*
* @param string $contents Content to include in page
*/
function Show_page($contents): void
{
header('Content-Type: text/html; charset=utf-8');
echo '<?xml version="1.0" encoding="utf-8"?>' . "\n";
echo '<!DOCTYPE HTML>
<html lang="en" dir="ltr">
<head>
<link rel="icon" href="../favicon.ico" type="image/x-icon">
<link rel="shortcut icon" href="../favicon.ico" type="image/x-icon">
<meta charset="utf-8">
<title>phpMyAdmin OpenID signon example</title>
</head>
<body>';
if (isset($_SESSION['PMA_single_signon_error_message'])) {
echo '<p class="error">' . $_SESSION['PMA_single_signon_message'] . '</p>';
unset($_SESSION['PMA_single_signon_message']);
}
echo $contents;
echo '</body></html>';
}
/**
* Display error and exit
*
* @param Exception $e Exception object
*/
function Die_error($e): void
{
$contents = "<div class='relyingparty_results'>\n";
$contents .= '<pre>' . htmlspecialchars($e->getMessage()) . "</pre>\n";
$contents .= "</div class='relyingparty_results'>";
Show_page($contents);
exit;
}
// phpcs:enable
/* Need to have cookie visible from parent directory */
session_set_cookie_params(0, '/', '', $secure_cookie, true);
/* Create signon session */
$session_name = 'SignonSession';
session_name($session_name);
@session_start();
// Determine realm and return_to
$base = 'http';
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on') {
$base .= 's';
}
$base .= '://' . $_SERVER['SERVER_NAME'] . ':' . $_SERVER['SERVER_PORT'];
$realm = $base . '/';
$returnTo = $base . dirname($_SERVER['PHP_SELF']);
if ($returnTo[strlen($returnTo) - 1] !== '/') {
$returnTo .= '/';
}
$returnTo .= 'openid.php';
/* Display form */
if ((! count($_GET) && ! count($_POST)) || isset($_GET['phpMyAdmin'])) {
/* Show simple form */
$content = '<form action="openid.php" method="post">
OpenID: <input type="text" name="identifier"><br>
<input type="submit" name="start">
</form>';
Show_page($content);
exit;
}
/* Grab identifier */
$identifier = null;
if (isset($_POST['identifier']) && is_string($_POST['identifier'])) {
$identifier = $_POST['identifier'];
} elseif (isset($_SESSION['identifier']) && is_string($_SESSION['identifier'])) {
$identifier = $_SESSION['identifier'];
}
/* Create OpenID object */
try {
$o = new OpenID_RelyingParty($returnTo, $realm, $identifier);
} catch (Throwable $e) {
Die_error($e);
}
/* Redirect to OpenID provider */
if (isset($_POST['start'])) {
try {
$authRequest = $o->prepare();
} catch (Throwable $e) {
Die_error($e);
}
$url = $authRequest->getAuthorizeURL();
header('Location: ' . $url);
exit;
}
/* Grab query string */
if (! count($_POST)) {
[, $queryString] = explode('?', $_SERVER['REQUEST_URI']);
} else {
// Fetch the raw query body
$queryString = file_get_contents('php://input');
}
/* Check reply */
try {
$message = new OpenID_Message($queryString, OpenID_Message::FORMAT_HTTP);
} catch (Throwable $e) {
Die_error($e);
}
$id = $message->get('openid.claimed_id');
if (empty($id) || ! isset($AUTH_MAP[$id])) {
Show_page('<p>User not allowed!</p>');
exit;
}
$_SESSION['PMA_single_signon_user'] = $AUTH_MAP[$id]['user'];
$_SESSION['PMA_single_signon_password'] = $AUTH_MAP[$id]['password'];
$_SESSION['PMA_single_signon_HMAC_secret'] = hash('sha1', uniqid(strval(random_int(0, mt_getrandmax())), true));
session_write_close();
/* Redirect to phpMyAdmin (should use absolute URL here!) */
header('Location: ../index.php');