mirror of
https://we.phorge.it/source/phorge.git
synced 2024-11-30 10:42:41 +01:00
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
|
|
|
|
/**
|
|
* Handle request startup, before loading the environment or libraries. This
|
|
* class bootstraps the request state up to the point where we can enter
|
|
* Phabricator code.
|
|
*
|
|
* NOTE: This class MUST NOT have any dependencies. It runs before libraries
|
|
* load.
|
|
*
|
|
* @task info Accessing Request Information
|
|
* @task hook Startup Hooks
|
|
* @task apocalypse In Case Of Apocalypse
|
|
* @task validation Validation
|
|
*/
|
|
final class PhabricatorStartup {
|
|
|
|
private static $startTime;
|
|
private static $globals = array();
|
|
private static $capturingOutput;
|
|
private static $rawInput;
|
|
|
|
|
|
/* -( Accessing Request Information )-------------------------------------- */
|
|
|
|
|
|
/**
|
|
* @task info
|
|
*/
|
|
public static function getStartTime() {
|
|
return self::$startTime;
|
|
}
|
|
|
|
|
|
/**
|
|
* @task info
|
|
*/
|
|
public static function getMicrosecondsSinceStart() {
|
|
return (int)(1000000 * (microtime(true) - self::getStartTime()));
|
|
}
|
|
|
|
|
|
/**
|
|
* @task info
|
|
*/
|
|
public static function setGlobal($key, $value) {
|
|
self::validateGlobal($key);
|
|
|
|
self::$globals[$key] = $value;
|
|
}
|
|
|
|
|
|
/**
|
|
* @task info
|
|
*/
|
|
public static function getGlobal($key, $default = null) {
|
|
self::validateGlobal($key);
|
|
|
|
if (!array_key_exists($key, self::$globals)) {
|
|
return $default;
|
|
}
|
|
|
|
return self::$globals[$key];
|
|
}
|
|
|
|
/**
|
|
* @task info
|
|
*/
|
|
public static function getRawInput() {
|
|
return self::$rawInput;
|
|
}
|
|
|
|
|
|
/* -( Startup Hooks )------------------------------------------------------ */
|
|
|
|
|
|
/**
|
|
* @task hook
|
|
*/
|
|
public static function didStartup() {
|
|
self::$startTime = microtime(true);
|
|
self::$globals = array();
|
|
|
|
static $registered;
|
|
if (!$registered) {
|
|
// NOTE: This protects us against multiple calls to didStartup() in the
|
|
// same request, but also against repeated requests to the same
|
|
// interpreter state, which we may implement in the future.
|
|
register_shutdown_function(array(__CLASS__, 'didShutdown'));
|
|
$registered = true;
|
|
}
|
|
|
|
self::setupPHP();
|
|
self::verifyPHP();
|
|
|
|
self::normalizeInput();
|
|
|
|
self::verifyRewriteRules();
|
|
|
|
self::detectPostMaxSizeTriggered();
|
|
|
|
self::beginOutputCapture();
|
|
|
|
self::$rawInput = (string)file_get_contents('php://input');
|
|
}
|
|
|
|
|
|
/**
|
|
* @task hook
|
|
*/
|
|
public static function didShutdown() {
|
|
$event = error_get_last();
|
|
|
|
if (!$event) {
|
|
return;
|
|
}
|
|
|
|
switch ($event['type']) {
|
|
case E_ERROR:
|
|
case E_PARSE:
|
|
case E_COMPILE_ERROR:
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
$msg = ">>> UNRECOVERABLE FATAL ERROR <<<\n\n";
|
|
if ($event) {
|
|
// Even though we should be emitting this as text-plain, escape things
|
|
// just to be sure since we can't really be sure what the program state
|
|
// is when we get here.
|
|
$msg .= htmlspecialchars(
|
|
$event['message']."\n\n".$event['file'].':'.$event['line'],
|
|
ENT_QUOTES,
|
|
'UTF-8');
|
|
}
|
|
|
|
// flip dem tables
|
|
$msg .= "\n\n\n";
|
|
$msg .= "\xe2\x94\xbb\xe2\x94\x81\xe2\x94\xbb\x20\xef\xb8\xb5\x20\xc2\xaf".
|
|
"\x5c\x5f\x28\xe3\x83\x84\x29\x5f\x2f\xc2\xaf\x20\xef\xb8\xb5\x20".
|
|
"\xe2\x94\xbb\xe2\x94\x81\xe2\x94\xbb";
|
|
|
|
self::didFatal($msg);
|
|
}
|
|
|
|
public static function loadCoreLibraries() {
|
|
$phabricator_root = dirname(dirname(__FILE__));
|
|
$libraries_root = dirname($phabricator_root);
|
|
|
|
$root = null;
|
|
if (!empty($_SERVER['PHUTIL_LIBRARY_ROOT'])) {
|
|
$root = $_SERVER['PHUTIL_LIBRARY_ROOT'];
|
|
}
|
|
|
|
ini_set(
|
|
'include_path',
|
|
$libraries_root.PATH_SEPARATOR.ini_get('include_path'));
|
|
|
|
@include_once $root.'libphutil/src/__phutil_library_init__.php';
|
|
if (!@constant('__LIBPHUTIL__')) {
|
|
self::didFatal(
|
|
"Unable to load libphutil. Put libphutil/ next to phabricator/, or ".
|
|
"update your PHP 'include_path' to include the parent directory of ".
|
|
"libphutil/.");
|
|
}
|
|
|
|
phutil_load_library('arcanist/src');
|
|
|
|
// Load Phabricator itself using the absolute path, so we never end up doing
|
|
// anything surprising (loading index.php and libraries from different
|
|
// directories).
|
|
phutil_load_library($phabricator_root.'/src');
|
|
}
|
|
|
|
/* -( Output Capture )----------------------------------------------------- */
|
|
|
|
|
|
public static function beginOutputCapture() {
|
|
if (self::$capturingOutput) {
|
|
self::didFatal("Already capturing output!");
|
|
}
|
|
self::$capturingOutput = true;
|
|
ob_start();
|
|
}
|
|
|
|
|
|
public static function endOutputCapture() {
|
|
if (!self::$capturingOutput) {
|
|
return null;
|
|
}
|
|
self::$capturingOutput = false;
|
|
return ob_get_clean();
|
|
}
|
|
|
|
|
|
/* -( In Case of Apocalypse )---------------------------------------------- */
|
|
|
|
|
|
/**
|
|
* @task apocalypse
|
|
*/
|
|
public static function didFatal($message) {
|
|
self::endOutputCapture();
|
|
$access_log = self::getGlobal('log.access');
|
|
|
|
if ($access_log) {
|
|
// We may end up here before the access log is initialized, e.g. from
|
|
// verifyPHP().
|
|
$access_log->setData(
|
|
array(
|
|
'c' => 500,
|
|
));
|
|
$access_log->write();
|
|
}
|
|
|
|
header(
|
|
'Content-Type: text/plain; charset=utf-8',
|
|
$replace = true,
|
|
$http_error = 500);
|
|
|
|
error_log($message);
|
|
echo $message;
|
|
|
|
exit(1);
|
|
}
|
|
|
|
|
|
/* -( Validation )--------------------------------------------------------- */
|
|
|
|
|
|
/**
|
|
* @task validation
|
|
*/
|
|
private static function setupPHP() {
|
|
error_reporting(E_ALL | E_STRICT);
|
|
ini_set('memory_limit', -1);
|
|
}
|
|
|
|
/**
|
|
* @task validation
|
|
*/
|
|
private static function normalizeInput() {
|
|
// Replace superglobals with unfiltered versions, disrespect php.ini (we
|
|
// filter ourselves)
|
|
$filter = array(INPUT_GET, INPUT_POST,
|
|
INPUT_SERVER, INPUT_ENV, INPUT_COOKIE);
|
|
foreach ($filter as $type) {
|
|
$filtered = filter_input_array($type, FILTER_UNSAFE_RAW);
|
|
if (!is_array($filtered)) {
|
|
continue;
|
|
}
|
|
switch ($type) {
|
|
case INPUT_SERVER:
|
|
$_SERVER = array_merge($_SERVER, $filtered);
|
|
break;
|
|
case INPUT_GET:
|
|
$_GET = array_merge($_GET, $filtered);
|
|
break;
|
|
case INPUT_COOKIE:
|
|
$_COOKIE = array_merge($_COOKIE, $filtered);
|
|
break;
|
|
case INPUT_POST:
|
|
$_POST = array_merge($_POST, $filtered);
|
|
break;
|
|
case INPUT_ENV;
|
|
$_ENV = array_merge($_ENV, $filtered);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// rebuild $_REQUEST, respecting order declared in ini files
|
|
$order = ini_get('request_order');
|
|
if (!$order) {
|
|
$order = ini_get('variables_order');
|
|
}
|
|
if (!$order) {
|
|
// $_REQUEST will be empty, leave it alone
|
|
return;
|
|
}
|
|
$_REQUEST = array();
|
|
for ($i = 0; $i < strlen($order); $i++) {
|
|
switch ($order[$i]) {
|
|
case 'G':
|
|
$_REQUEST = array_merge($_REQUEST, $_GET);
|
|
break;
|
|
case 'P':
|
|
$_REQUEST = array_merge($_REQUEST, $_POST);
|
|
break;
|
|
case 'C':
|
|
$_REQUEST = array_merge($_REQUEST, $_COOKIE);
|
|
break;
|
|
default:
|
|
// $_ENV and $_SERVER never go into $_REQUEST
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @task validation
|
|
*/
|
|
private static function verifyPHP() {
|
|
$required_version = '5.2.3';
|
|
if (version_compare(PHP_VERSION, $required_version) < 0) {
|
|
self::didFatal(
|
|
"You are running PHP version '".PHP_VERSION."', which is older than ".
|
|
"the minimum version, '{$required_version}'. Update to at least ".
|
|
"'{$required_version}'.");
|
|
}
|
|
|
|
if (get_magic_quotes_gpc()) {
|
|
self::didFatal(
|
|
"Your server is configured with PHP 'magic_quotes_gpc' enabled. This ".
|
|
"feature is 'highly discouraged' by PHP's developers and you must ".
|
|
"disable it to run Phabricator. Consult the PHP manual for ".
|
|
"instructions.");
|
|
}
|
|
|
|
if (extension_loaded('apc')) {
|
|
$apc_version = phpversion('apc');
|
|
$known_bad = array(
|
|
'3.1.14' => true,
|
|
'3.1.15' => true,
|
|
'3.1.15-dev' => true,
|
|
);
|
|
if (isset($known_bad[$apc_version])) {
|
|
self::didFatal(
|
|
"You have APC {$apc_version} installed. This version of APC is ".
|
|
"known to be bad, and does not work with Phabricator (it will ".
|
|
"cause Phabricator to fatal unrecoverably with nonsense errors). ".
|
|
"Downgrade to version 3.1.13.");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* @task validation
|
|
*/
|
|
private static function verifyRewriteRules() {
|
|
if (isset($_REQUEST['__path__']) && strlen($_REQUEST['__path__'])) {
|
|
return;
|
|
}
|
|
|
|
if (php_sapi_name() == 'cli-server') {
|
|
// Compatibility with PHP 5.4+ built-in web server.
|
|
$url = parse_url($_SERVER['REQUEST_URI']);
|
|
$_REQUEST['__path__'] = $url['path'];
|
|
return;
|
|
}
|
|
|
|
if (!isset($_REQUEST['__path__'])) {
|
|
self::didFatal(
|
|
"Request parameter '__path__' is not set. Your rewrite rules ".
|
|
"are not configured correctly.");
|
|
}
|
|
|
|
if (!strlen($_REQUEST['__path__'])) {
|
|
self::didFatal(
|
|
"Request parameter '__path__' is set, but empty. Your rewrite rules ".
|
|
"are not configured correctly. The '__path__' should always ".
|
|
"begin with a '/'.");
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* @task validation
|
|
*/
|
|
private static function validateGlobal($key) {
|
|
static $globals = array(
|
|
'log.access' => true,
|
|
'csrf.salt' => true,
|
|
);
|
|
|
|
if (empty($globals[$key])) {
|
|
throw new Exception("Access to unknown startup global '{$key}'!");
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Detect if this request has had its POST data stripped by exceeding the
|
|
* 'post_max_size' PHP configuration limit.
|
|
*
|
|
* PHP has a setting called 'post_max_size'. If a POST request arrives with
|
|
* a body larger than the limit, PHP doesn't generate $_POST but processes
|
|
* the request anyway, and provides no formal way to detect that this
|
|
* happened.
|
|
*
|
|
* We can still read the entire body out of `php://input`. However according
|
|
* to the documentation the stream isn't available for "multipart/form-data"
|
|
* (on nginx + php-fpm it appears that it is available, though, at least) so
|
|
* any attempt to generate $_POST would be fragile.
|
|
*
|
|
* @task validation
|
|
*/
|
|
private static function detectPostMaxSizeTriggered() {
|
|
// If this wasn't a POST, we're fine.
|
|
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
|
|
return;
|
|
}
|
|
|
|
// If there's POST data, clearly we're in good shape.
|
|
if ($_POST) {
|
|
return;
|
|
}
|
|
|
|
// For HTML5 drag-and-drop file uploads, Safari submits the data as
|
|
// "application/x-www-form-urlencoded". For most files this generates
|
|
// something in POST because most files decode to some nonempty (albeit
|
|
// meaningless) value. However, some files (particularly small images)
|
|
// don't decode to anything. If we know this is a drag-and-drop upload,
|
|
// we can skip this check.
|
|
if (isset($_REQUEST['__upload__'])) {
|
|
return;
|
|
}
|
|
|
|
// PHP generates $_POST only for two content types. This routing happens
|
|
// in `main/php_content_types.c` in PHP. Normally, all forms use one of
|
|
// these content types, but some requests may not -- for example, Firefox
|
|
// submits files sent over HTML5 XMLHTTPRequest APIs with the Content-Type
|
|
// of the file itself. If we don't have a recognized content type, we
|
|
// don't need $_POST.
|
|
//
|
|
// NOTE: We use strncmp() because the actual content type may be something
|
|
// like "multipart/form-data; boundary=...".
|
|
//
|
|
// NOTE: Chrome sometimes omits this header, see some discussion in T1762
|
|
// and http://code.google.com/p/chromium/issues/detail?id=6800
|
|
$content_type = isset($_SERVER['CONTENT_TYPE'])
|
|
? $_SERVER['CONTENT_TYPE']
|
|
: '';
|
|
|
|
$parsed_types = array(
|
|
'application/x-www-form-urlencoded',
|
|
'multipart/form-data',
|
|
);
|
|
|
|
$is_parsed_type = false;
|
|
foreach ($parsed_types as $parsed_type) {
|
|
if (strncmp($content_type, $parsed_type, strlen($parsed_type)) === 0) {
|
|
$is_parsed_type = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$is_parsed_type) {
|
|
return;
|
|
}
|
|
|
|
// Check for 'Content-Length'. If there's no data, we don't expect $_POST
|
|
// to exist.
|
|
$length = (int)$_SERVER['CONTENT_LENGTH'];
|
|
if (!$length) {
|
|
return;
|
|
}
|
|
|
|
// Time to fatal: we know this was a POST with data that should have been
|
|
// populated into $_POST, but it wasn't.
|
|
|
|
$config = ini_get('post_max_size');
|
|
PhabricatorStartup::didFatal(
|
|
"As received by the server, this request had a nonzero content length ".
|
|
"but no POST data.\n\n".
|
|
"Normally, this indicates that it exceeds the 'post_max_size' setting ".
|
|
"in the PHP configuration on the server. Increase the 'post_max_size' ".
|
|
"setting or reduce the size of the request.\n\n".
|
|
"Request size according to 'Content-Length' was '{$length}', ".
|
|
"'post_max_size' is set to '{$config}'.");
|
|
}
|
|
|
|
}
|