Include script that RemoteV2 interacts with.
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<?php
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// this is the source for the script that RemoteV2 interacts with
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define('SRV_REQ_SEC', 'secret key goes here');
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define('SRV_REQ_LIFE', 60);
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define('SRV_DIR_FMT', '/srv/minecraft/%s');
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function base64url_encode(string $input): string {
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return rtrim(strtr(base64_encode($input), '+/', '-_'), '=');
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}
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function base64url_decode(string $input): string {
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return base64_decode(str_pad(strtr($input, '-_', '+/'), strlen($input) % 4, '=', STR_PAD_RIGHT));
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}
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function rcon_open(int $port) {
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$conn = fsockopen('localhost', $port, $code, $message, 2);
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return $conn;
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}
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function rcon_close($conn) {
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if(is_resource($conn))
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fclose($conn);
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}
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function rcon_recv($conn): array {
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if(!is_resource($conn))
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return ['error' => ':rcon:conn'];
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extract(unpack('Vlength', fread($conn, 4)));
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if($length < 10)
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return ['error' => ':rcon:length'];
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extract(unpack('VreqId/Vopcode', fread($conn, 8)));
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$body = substr(fread($conn, $length - 8), 0, -2);
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return compact('reqId', 'opcode', 'body');
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}
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function rcon_send($conn, int $opcode, string $text): int {
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if(!is_resource($conn))
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return -1;
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$length = 10 + strlen($text);
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$reqId = random_int(1, 0x7FFFFFFF);
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fwrite($conn, pack('VVV', $length, $reqId, $opcode) . $text . "\0\0");
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return $reqId;
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}
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function rcon_send_large($conn, int $opcode, string $text): array {
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if(!is_resource($conn))
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return ['error' => ':rcon:conn'];
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$reqId = rcon_send($conn, $opcode, $text);
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if($reqId < 1) return ['error' => ':rcon:request'];
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$trailer = rcon_send($conn, 2, 'time query gametime');
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if($trailer < 1) return ['error' => ':rcon:trailer'];
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$opcode = 0;
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$body = '';
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for(;;) {
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$resp = rcon_recv($conn);
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if(!empty($resp['error']))
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return $resp;
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if($resp['reqId'] === $trailer) break;
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if($resp['reqId'] !== $reqId) continue;
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if($resp['opcode'] !== 0)
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return ['error' => ':rcon:opcode'];
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$body .= $resp['body'];
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}
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return compact('reqId', 'trailer', 'opcode', 'body');
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}
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function rcon_open_props(array $props) {
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if(empty($props['rcon.port']))
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die('{"error":":conf:rcon-port"}');
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if(empty($props['rcon.password']))
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die('{"error":":conf:rcon-passwd"}');
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return rcon_open($props['rcon.port']);
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}
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function rcon_auth_props($conn, array $props): void {
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if(empty($props['rcon.password']))
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die('{"error":":conf:rcon-passwd"}');
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rcon_send($conn, 3, $props['rcon.password']);
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$resp = rcon_recv($conn);
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if(!empty($resp['error']))
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die(json_encode(['error' => $resp['error']]));
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}
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function rcon_get_whitelist($conn): array {
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$resp = rcon_send_large($conn, 2, 'whitelist list');
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if(!empty($resp['error'])) return $resp;
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$halfs = explode(':', $resp['body'], 2);
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if(empty($halfs[1])) return [];
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$names = explode(',', $halfs[1]);
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foreach($names as &$name)
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$name = trim($name);
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return array_values(array_filter($names));
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}
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function rcon_add_whitelist($conn, array $userNames): array {
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$results = [];
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foreach($userNames as $name) {
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rcon_send($conn, 2, 'whitelist add ' . $name); // todo: sanitise username
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$resp = rcon_recv($conn);
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$results[$name] = [
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'success' => str_starts_with($resp['body'], 'Added '),
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'message' => $resp['body'],
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];
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}
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rcon_send($conn, 2, 'whitelist reload');
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rcon_recv($conn); // discard reload message
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return compact('results');
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}
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function rcon_remove_whitelist($conn, array $userNames): array {
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$results = [];
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foreach($userNames as $name) {
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rcon_send($conn, 2, 'whitelist remove ' . $name); // todo: sanitise username
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$resp = rcon_recv($conn);
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$results[$name] = [
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'success' => str_starts_with($resp['body'], 'Removed '),
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'message' => $resp['body'],
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];
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}
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rcon_send($conn, 2, 'whitelist reload');
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rcon_recv($conn); // discard reload message
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return compact('results');
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}
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function read_server_props(string $serverPath, string $fileName = 'server.properties'): array {
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$props = [];
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$path = realpath($serverPath . '/' . $fileName);
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if(is_file($path)) {
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$lines = file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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foreach($lines as $line) {
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if(empty($line) || str_starts_with($line, '#'))
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continue;
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$parts = explode('=', $line, 2);
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if(count($parts) == 2) {
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$value = $parts[1];
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if($value === 'false' || $value === 'true')
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$value = $value === 'true';
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elseif(ctype_digit($value))
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$value = (int)$value;
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elseif(is_numeric($value))
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$value = (float)$value;
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$props[$parts[0]] = $value;
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}
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}
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}
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return $props;
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}
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function create_request_hash(int $time = -1, ?array $params = null, ?string $method = null, ?string $path = null): string {
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if($time < 0)
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$time = time();
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if($params === null)
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$params = $_REQUEST ?? [];
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if($method === null)
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$method = $GLOBALS['reqMethod'] ?? '';
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if($path === null)
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$path = $GLOBALS['reqPath'] ?? '';
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ksort($params);
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$compare = [];
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$stringify = null; // use() gets sad if it's not defined yet
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$stringify = function(array $arr, string $prefix = '') use(&$compare, &$stringify) {
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foreach($arr as $name => $value) {
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if(is_array($value))
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$stringify($value, $name . ';');
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else
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$compare[] = "{$name}:{$value}";
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}
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};
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$stringify($params);
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$input = "{$time}%{$method} {$path}%" . implode('#', $compare);
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return hash_hmac('sha256', $input, SRV_REQ_SEC, true);
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}
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function verify_request_hash(): bool {
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$realTime = time();
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$lifeTimeHalf = (int)ceil(SRV_REQ_LIFE / 2);
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$userHash = base64url_decode((string)filter_input(INPUT_SERVER, 'HTTP_X_MINCE_SIGNATURE'));
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$userTime = (int)filter_input(INPUT_SERVER, 'HTTP_X_MINCE_TIMESTAMP', FILTER_SANITIZE_NUMBER_INT);
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if(strlen($userHash) !== 32 || $userTime < ($realTime - $lifeTimeHalf) || $userTime > ($realTime + $lifeTimeHalf))
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return false;
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return hash_equals(create_request_hash($userTime), $userHash);
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}
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function get_server_path(string $serverId): string {
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if(empty($serverId) || !ctype_alnum($serverId))
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die('{"error":":req:id"}');
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$path = sprintf(SRV_DIR_FMT, $serverId);
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if(!is_dir($path))
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die('{"error":":req:server"}');
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return $path;
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}
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$reqMethod = (string)filter_input(INPUT_SERVER, 'REQUEST_METHOD');
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$reqPath = '/' . trim(parse_url((string)filter_input(INPUT_SERVER, 'REQUEST_URI'), PHP_URL_PATH), '/');
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header('Content-Type: application/json; charset=utf-8');
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if(!verify_request_hash())
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die('{"error":":request:verification"}');
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if($reqMethod === 'GET' && $reqPath === '/') {
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$dirs = glob(__DIR__ . '/../*');
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$servers = [];
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foreach($dirs as $dir)
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if(is_file($dir . '/server.properties') && !is_file($dir . '/.dead'))
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$servers[] = basename($dir);
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echo json_encode(compact('servers'));
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return;
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}
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if($reqMethod === 'GET' && $reqPath === '/whitelist') {
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$sPath = get_server_path((string)filter_input(INPUT_GET, 'server'));
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$sProps = read_server_props($sPath);
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$rcon = rcon_open_props($sProps);
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try {
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rcon_auth_props($rcon, $sProps);
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echo json_encode(['list' => rcon_get_whitelist($rcon)]);
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} finally {
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rcon_close($rcon);
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}
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return;
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}
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if($reqMethod === 'POST' && $reqPath === '/whitelist') {
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$wNames = json_decode((string)filter_input(INPUT_POST, 'names'));
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$sPath = get_server_path((string)filter_input(INPUT_POST, 'server'));
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$sProps = read_server_props($sPath);
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$rcon = rcon_open_props($sProps);
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try {
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rcon_auth_props($rcon, $sProps);
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echo json_encode(rcon_add_whitelist($rcon, $wNames));
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} finally {
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rcon_close($rcon);
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}
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return;
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}
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if($reqMethod === 'DELETE' && $reqPath === '/whitelist') {
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$wNames = json_decode((string)filter_input(INPUT_GET, 'names'));
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$sPath = get_server_path((string)filter_input(INPUT_GET, 'server'));
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$sProps = read_server_props($sPath);
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$rcon = rcon_open_props($sProps);
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try {
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rcon_auth_props($rcon, $sProps);
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echo json_encode(rcon_remove_whitelist($rcon, $wNames));
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} finally {
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rcon_close($rcon);
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}
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return;
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}
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echo '{"error":":request:notfound"}';
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