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<?php
$connection = '';
if (!$drivers) {
page_header(lang('No extension'), lang('None of the supported PHP extensions (%s) are available.', implode(", ", $possible_drivers)), null);
page_footer("auth");
exit;
}
$token = $_SESSION["token"];
if (!$_SESSION["token"]) {
$_SESSION["token"] = rand(1, 1e6); // defense against cross-site request forgery
}
$permanent = array();
if ($_COOKIE["adminer_permanent"]) {
foreach (explode(" ", $_COOKIE["adminer_permanent"]) as $val) {
list($key) = explode(":", $val);
$permanent[$key] = $val;
}
}
if (isset($_POST["server"])) {
session_regenerate_id(); // defense against session fixation
$_SESSION["passwords"][$_POST["driver"]][$_POST["server"]][$_POST["username"]] = $_POST["password"];
if ($_POST["permanent"]) {
$key = base64_encode($_POST["driver"]) . "-" . base64_encode($_POST["server"]) . "-" . base64_encode($_POST["username"]);
$private = $adminer->permanentLogin();
$permanent[$key] = "$key:" . base64_encode($private ? encrypt_string($_POST["password"], $private) : "");
cookie("adminer_permanent", implode(" ", $permanent));
}
if (count($_POST) == ($_POST["permanent"] ? 5 : 4) // 4 - driver, server, username, password
|| DRIVER != $_POST["driver"]
|| SERVER != $_POST["server"]
|| $_GET["username"] !== $_POST["username"] // "0" == "00"
) {
redirect(auth_url($_POST["driver"], $_POST["server"], $_POST["username"]));
}
} elseif ($_POST["logout"]) {
if ($token && $_POST["token"] != $token) {
page_header(lang('Logout'), lang('Invalid CSRF token. Send the form again.'));
page_footer("db");
exit;
} else {
foreach (array("passwords", "databases", "history") as $key) {
set_session($key, null);
}
$key = base64_encode(DRIVER) . "-" . base64_encode(SERVER) . "-" . base64_encode($_GET["username"]);
if ($permanent[$key]) {
unset($permanent[$key]);
cookie("adminer_permanent", implode(" ", $permanent));
}
redirect(substr(preg_replace('~(username|db|ns)=[^&]*&~', '', ME), 0, -1), lang('Logout successful.'));
}
} elseif ($permanent && !$_SESSION["passwords"]) {
session_regenerate_id();
$private = $adminer->permanentLogin(); // try to decode even if not set
foreach ($permanent as $key => $val) {
list(, $cipher) = explode(":", $val);
list($driver, $server, $username) = array_map('base64_decode', explode("-", $key));
$_SESSION["passwords"][$driver][$server][$username] = decrypt_string($cipher, $private);
}
}
function auth_error($exception = null) {
global $connection, $adminer, $token;
$session_name = session_name();
$error = "";
if (!$_COOKIE[$session_name] && $_GET[$session_name] && ini_bool("session.use_only_cookies")) {
$error = lang('Session support must be enabled.');
} elseif (isset($_GET["username"])) {
if (($_COOKIE[$session_name] || $_GET[$session_name]) && !$token) {
$error = lang('Session expired, please login again.');
} else {
$password = &get_session("passwords");
if (isset($password)) {
$error = h($exception ? $exception->getMessage() : (is_string($connection) ? $connection : lang('Invalid credentials.')));
$password = null;
}
}
}
page_header(lang('Login'), $error, null);
echo "<form action='' method='post'>\n";
$adminer->loginForm();
echo "<div>";
hidden_fields($_POST, array("driver", "server", "username", "password", "permanent")); // expired session
echo "</div>\n";
echo "</form>\n";
page_footer("auth");
}
if (isset($_GET["username"]) && class_exists("Min_DB")) { // doesn't exists with passing wrong driver
$connection = connect();
}
if (is_string($connection) || !$adminer->login($_GET["username"], get_session("passwords"))) {
auth_error();
exit;
}
$token = $_SESSION["token"]; ///< @var string CSRF protection
if (isset($_POST["server"]) && $_POST["token"]) {
$_POST["token"] = $token; // reset token after explicit login
}
$error = ($_POST ///< @var string
? ($_POST["token"] == $token ? "" : lang('Invalid CSRF token. Send the form again.'))
: ($_SERVER["REQUEST_METHOD"] != "POST" ? "" : lang('Too big POST data. Reduce the data or increase the %s configuration directive.', '"post_max_size"')) // posted form with no data means that post_max_size exceeded because Adminer always sends token at least
);
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