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https://we.phorge.it/source/phorge.git
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7298589c86
Summary: Ref T3684 for discussion. This could be cleaned up a bit (it would be nice to draw entropy once per request, for instance, and maybe respect CSRF_TOKEN_LENGTH more closely) but should effectively mitigate BREACH. Test Plan: Submitted forms; submitted forms after mucking with CSRF and observed CSRF error. Verified that source now has "B@..." tokens. Reviewers: btrahan Reviewed By: btrahan CC: aran Maniphest Tasks: T3684 Differential Revision: https://secure.phabricator.com/D6686
474 lines
13 KiB
PHP
474 lines
13 KiB
PHP
<?php
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/**
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* Handle request startup, before loading the environment or libraries. This
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* class bootstraps the request state up to the point where we can enter
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* Phabricator code.
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*
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* NOTE: This class MUST NOT have any dependencies. It runs before libraries
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* load.
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*
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* @task info Accessing Request Information
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* @task hook Startup Hooks
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* @task apocalypse In Case Of Apocalypse
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* @task validation Validation
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*/
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final class PhabricatorStartup {
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private static $startTime;
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private static $globals = array();
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private static $capturingOutput;
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private static $rawInput;
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/* -( Accessing Request Information )-------------------------------------- */
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/**
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* @task info
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*/
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public static function getStartTime() {
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return self::$startTime;
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}
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/**
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* @task info
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*/
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public static function getMicrosecondsSinceStart() {
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return (int)(1000000 * (microtime(true) - self::getStartTime()));
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}
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/**
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* @task info
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*/
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public static function setGlobal($key, $value) {
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self::validateGlobal($key);
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self::$globals[$key] = $value;
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}
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/**
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* @task info
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*/
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public static function getGlobal($key, $default = null) {
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self::validateGlobal($key);
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if (!array_key_exists($key, self::$globals)) {
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return $default;
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}
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return self::$globals[$key];
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}
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/**
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* @task info
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*/
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public static function getRawInput() {
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return self::$rawInput;
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}
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/* -( Startup Hooks )------------------------------------------------------ */
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/**
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* @task hook
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*/
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public static function didStartup() {
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self::$startTime = microtime(true);
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self::$globals = array();
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static $registered;
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if (!$registered) {
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// NOTE: This protects us against multiple calls to didStartup() in the
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// same request, but also against repeated requests to the same
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// interpreter state, which we may implement in the future.
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register_shutdown_function(array(__CLASS__, 'didShutdown'));
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$registered = true;
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}
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self::setupPHP();
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self::verifyPHP();
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self::normalizeInput();
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self::verifyRewriteRules();
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self::detectPostMaxSizeTriggered();
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self::beginOutputCapture();
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self::$rawInput = (string)file_get_contents('php://input');
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}
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/**
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* @task hook
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*/
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public static function didShutdown() {
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$event = error_get_last();
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if (!$event) {
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return;
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}
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switch ($event['type']) {
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case E_ERROR:
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case E_PARSE:
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case E_COMPILE_ERROR:
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break;
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default:
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return;
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}
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$msg = ">>> UNRECOVERABLE FATAL ERROR <<<\n\n";
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if ($event) {
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// Even though we should be emitting this as text-plain, escape things
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// just to be sure since we can't really be sure what the program state
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// is when we get here.
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$msg .= htmlspecialchars(
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$event['message']."\n\n".$event['file'].':'.$event['line'],
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ENT_QUOTES,
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'UTF-8');
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}
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// flip dem tables
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$msg .= "\n\n\n";
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$msg .= "\xe2\x94\xbb\xe2\x94\x81\xe2\x94\xbb\x20\xef\xb8\xb5\x20\xc2\xaf".
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"\x5c\x5f\x28\xe3\x83\x84\x29\x5f\x2f\xc2\xaf\x20\xef\xb8\xb5\x20".
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"\xe2\x94\xbb\xe2\x94\x81\xe2\x94\xbb";
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self::didFatal($msg);
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}
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public static function loadCoreLibraries() {
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$phabricator_root = dirname(dirname(__FILE__));
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$libraries_root = dirname($phabricator_root);
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$root = null;
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if (!empty($_SERVER['PHUTIL_LIBRARY_ROOT'])) {
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$root = $_SERVER['PHUTIL_LIBRARY_ROOT'];
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}
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ini_set(
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'include_path',
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$libraries_root.PATH_SEPARATOR.ini_get('include_path'));
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@include_once $root.'libphutil/src/__phutil_library_init__.php';
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if (!@constant('__LIBPHUTIL__')) {
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self::didFatal(
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"Unable to load libphutil. Put libphutil/ next to phabricator/, or ".
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"update your PHP 'include_path' to include the parent directory of ".
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"libphutil/.");
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}
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phutil_load_library('arcanist/src');
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// Load Phabricator itself using the absolute path, so we never end up doing
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// anything surprising (loading index.php and libraries from different
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// directories).
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phutil_load_library($phabricator_root.'/src');
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}
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/* -( Output Capture )----------------------------------------------------- */
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public static function beginOutputCapture() {
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if (self::$capturingOutput) {
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self::didFatal("Already capturing output!");
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}
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self::$capturingOutput = true;
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ob_start();
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}
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public static function endOutputCapture() {
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if (!self::$capturingOutput) {
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return null;
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}
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self::$capturingOutput = false;
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return ob_get_clean();
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}
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/* -( In Case of Apocalypse )---------------------------------------------- */
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/**
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* @task apocalypse
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*/
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public static function didFatal($message) {
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self::endOutputCapture();
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$access_log = self::getGlobal('log.access');
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if ($access_log) {
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// We may end up here before the access log is initialized, e.g. from
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// verifyPHP().
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$access_log->setData(
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array(
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'c' => 500,
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));
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$access_log->write();
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}
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header(
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'Content-Type: text/plain; charset=utf-8',
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$replace = true,
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$http_error = 500);
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error_log($message);
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echo $message;
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exit(1);
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}
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/* -( Validation )--------------------------------------------------------- */
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/**
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* @task validation
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*/
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private static function setupPHP() {
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error_reporting(E_ALL | E_STRICT);
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ini_set('memory_limit', -1);
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}
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/**
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* @task validation
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*/
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private static function normalizeInput() {
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// Replace superglobals with unfiltered versions, disrespect php.ini (we
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// filter ourselves)
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$filter = array(INPUT_GET, INPUT_POST,
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INPUT_SERVER, INPUT_ENV, INPUT_COOKIE);
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foreach ($filter as $type) {
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$filtered = filter_input_array($type, FILTER_UNSAFE_RAW);
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if (!is_array($filtered)) {
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continue;
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}
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switch ($type) {
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case INPUT_SERVER:
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$_SERVER = array_merge($_SERVER, $filtered);
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break;
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case INPUT_GET:
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$_GET = array_merge($_GET, $filtered);
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break;
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case INPUT_COOKIE:
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$_COOKIE = array_merge($_COOKIE, $filtered);
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break;
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case INPUT_POST:
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$_POST = array_merge($_POST, $filtered);
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break;
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case INPUT_ENV;
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$_ENV = array_merge($_ENV, $filtered);
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break;
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}
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}
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// rebuild $_REQUEST, respecting order declared in ini files
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$order = ini_get('request_order');
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if (!$order) {
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$order = ini_get('variables_order');
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}
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if (!$order) {
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// $_REQUEST will be empty, leave it alone
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return;
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}
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$_REQUEST = array();
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for ($i = 0; $i < strlen($order); $i++) {
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switch ($order[$i]) {
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case 'G':
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$_REQUEST = array_merge($_REQUEST, $_GET);
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break;
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case 'P':
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$_REQUEST = array_merge($_REQUEST, $_POST);
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break;
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case 'C':
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$_REQUEST = array_merge($_REQUEST, $_COOKIE);
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break;
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default:
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// $_ENV and $_SERVER never go into $_REQUEST
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break;
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}
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}
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}
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/**
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* @task validation
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*/
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private static function verifyPHP() {
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$required_version = '5.2.3';
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if (version_compare(PHP_VERSION, $required_version) < 0) {
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self::didFatal(
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"You are running PHP version '".PHP_VERSION."', which is older than ".
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"the minimum version, '{$required_version}'. Update to at least ".
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"'{$required_version}'.");
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}
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if (get_magic_quotes_gpc()) {
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self::didFatal(
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"Your server is configured with PHP 'magic_quotes_gpc' enabled. This ".
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"feature is 'highly discouraged' by PHP's developers and you must ".
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"disable it to run Phabricator. Consult the PHP manual for ".
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"instructions.");
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}
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if (extension_loaded('apc')) {
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$apc_version = phpversion('apc');
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$known_bad = array(
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'3.1.14' => true,
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'3.1.15' => true,
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'3.1.15-dev' => true,
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);
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if (isset($known_bad[$apc_version])) {
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self::didFatal(
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"You have APC {$apc_version} installed. This version of APC is ".
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"known to be bad, and does not work with Phabricator (it will ".
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"cause Phabricator to fatal unrecoverably with nonsense errors). ".
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"Downgrade to version 3.1.13.");
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}
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}
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}
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/**
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* @task validation
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*/
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private static function verifyRewriteRules() {
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if (isset($_REQUEST['__path__']) && strlen($_REQUEST['__path__'])) {
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return;
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}
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if (php_sapi_name() == 'cli-server') {
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// Compatibility with PHP 5.4+ built-in web server.
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$url = parse_url($_SERVER['REQUEST_URI']);
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$_REQUEST['__path__'] = $url['path'];
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return;
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}
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if (!isset($_REQUEST['__path__'])) {
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self::didFatal(
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"Request parameter '__path__' is not set. Your rewrite rules ".
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"are not configured correctly.");
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}
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if (!strlen($_REQUEST['__path__'])) {
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self::didFatal(
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"Request parameter '__path__' is set, but empty. Your rewrite rules ".
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"are not configured correctly. The '__path__' should always ".
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"begin with a '/'.");
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}
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}
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/**
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* @task validation
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*/
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private static function validateGlobal($key) {
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static $globals = array(
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'log.access' => true,
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'csrf.salt' => true,
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);
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if (empty($globals[$key])) {
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throw new Exception("Access to unknown startup global '{$key}'!");
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}
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}
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/**
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* Detect if this request has had its POST data stripped by exceeding the
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* 'post_max_size' PHP configuration limit.
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*
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* PHP has a setting called 'post_max_size'. If a POST request arrives with
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* a body larger than the limit, PHP doesn't generate $_POST but processes
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* the request anyway, and provides no formal way to detect that this
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* happened.
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*
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* We can still read the entire body out of `php://input`. However according
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* to the documentation the stream isn't available for "multipart/form-data"
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* (on nginx + php-fpm it appears that it is available, though, at least) so
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* any attempt to generate $_POST would be fragile.
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*
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* @task validation
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*/
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private static function detectPostMaxSizeTriggered() {
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// If this wasn't a POST, we're fine.
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if ($_SERVER['REQUEST_METHOD'] != 'POST') {
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return;
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}
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// If there's POST data, clearly we're in good shape.
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if ($_POST) {
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return;
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}
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// For HTML5 drag-and-drop file uploads, Safari submits the data as
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// "application/x-www-form-urlencoded". For most files this generates
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// something in POST because most files decode to some nonempty (albeit
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// meaningless) value. However, some files (particularly small images)
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// don't decode to anything. If we know this is a drag-and-drop upload,
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// we can skip this check.
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if (isset($_REQUEST['__upload__'])) {
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return;
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}
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// PHP generates $_POST only for two content types. This routing happens
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// in `main/php_content_types.c` in PHP. Normally, all forms use one of
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// these content types, but some requests may not -- for example, Firefox
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// submits files sent over HTML5 XMLHTTPRequest APIs with the Content-Type
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// of the file itself. If we don't have a recognized content type, we
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// don't need $_POST.
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//
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// NOTE: We use strncmp() because the actual content type may be something
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// like "multipart/form-data; boundary=...".
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//
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// NOTE: Chrome sometimes omits this header, see some discussion in T1762
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// and http://code.google.com/p/chromium/issues/detail?id=6800
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$content_type = isset($_SERVER['CONTENT_TYPE'])
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? $_SERVER['CONTENT_TYPE']
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: '';
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$parsed_types = array(
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'application/x-www-form-urlencoded',
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'multipart/form-data',
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);
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$is_parsed_type = false;
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foreach ($parsed_types as $parsed_type) {
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if (strncmp($content_type, $parsed_type, strlen($parsed_type)) === 0) {
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$is_parsed_type = true;
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break;
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}
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}
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if (!$is_parsed_type) {
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return;
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}
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// Check for 'Content-Length'. If there's no data, we don't expect $_POST
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// to exist.
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$length = (int)$_SERVER['CONTENT_LENGTH'];
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if (!$length) {
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return;
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}
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// Time to fatal: we know this was a POST with data that should have been
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// populated into $_POST, but it wasn't.
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$config = ini_get('post_max_size');
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PhabricatorStartup::didFatal(
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"As received by the server, this request had a nonzero content length ".
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"but no POST data.\n\n".
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"Normally, this indicates that it exceeds the 'post_max_size' setting ".
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"in the PHP configuration on the server. Increase the 'post_max_size' ".
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"setting or reduce the size of the request.\n\n".
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"Request size according to 'Content-Length' was '{$length}', ".
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"'post_max_size' is set to '{$config}'.");
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}
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}
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