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b9a1260ef5
Summary: Depends on D20137. Ref T13250. Ref T12101. In versions of PHP beyond 7, various engine errors are gradually changing from internal fatals or internal errors to `Throwables`, a superclass of `Exception`. This is generally a good change, but code written against PHP 5.x before `Throwable` was introduced may not catch these errors, even when the code is intended to be a top-level exception handler. (The double-catch pattern here and elsewhere is because `Throwable` does not exist in older PHP, so `catch (Throwable $ex)` catches nothing. The `Exception $ex` clause catches everything in old PHP, the `Throwable $ex` clause catches everything in newer PHP.) Generalize some `Exception` into `Throwable`. Test Plan: - Added a bogus function call to the rendering stack. - Before change: got a blank page. - After change: nice exception page. {F6205012} Reviewers: amckinley Reviewed By: amckinley Maniphest Tasks: T13250, T12101 Differential Revision: https://secure.phabricator.com/D20138
828 lines
24 KiB
PHP
828 lines
24 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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* Rate Limiting
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* =============
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*
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* Phabricator limits the rate at which clients can request pages, and issues
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* HTTP 429 "Too Many Requests" responses if clients request too many pages too
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* quickly. Although this is not a complete defense against high-volume attacks,
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* it can protect an install against aggressive crawlers, security scanners,
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* and some types of malicious activity.
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*
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* To perform rate limiting, each page increments a score counter for the
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* requesting user's IP. The page can give the IP more points for an expensive
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* request, or fewer for an authetnicated request.
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*
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* Score counters are kept in buckets, and writes move to a new bucket every
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* minute. After a few minutes (defined by @{method:getRateLimitBucketCount}),
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* the oldest bucket is discarded. This provides a simple mechanism for keeping
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* track of scores without needing to store, access, or read very much data.
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*
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* Users are allowed to accumulate up to 1000 points per minute, averaged across
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* all of the tracked buckets.
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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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* @task ratelimit Rate Limiting
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* @task phases Startup Phase Timers
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*/
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final class PhabricatorStartup {
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private static $startTime;
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private static $debugTimeLimit;
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private static $accessLog;
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private static $capturingOutput;
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private static $rawInput;
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private static $oldMemoryLimit;
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private static $phases;
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private static $limits = array();
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/* -( Accessing Request Information )-------------------------------------- */
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/**
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* @task info
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*/
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public static function getStartTime() {
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return self::$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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// This is the same as "phutil_microseconds_since()", but we may not have
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// loaded libphutil yet.
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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 setAccessLog($access_log) {
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self::$accessLog = $access_log;
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}
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/**
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* @task info
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*/
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public static function getRawInput() {
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if (self::$rawInput === null) {
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$stream = new AphrontRequestStream();
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if (isset($_SERVER['HTTP_CONTENT_ENCODING'])) {
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$encoding = trim($_SERVER['HTTP_CONTENT_ENCODING']);
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$stream->setEncoding($encoding);
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}
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$input = '';
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do {
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$bytes = $stream->readData();
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if ($bytes === null) {
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break;
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}
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$input .= $bytes;
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} while (true);
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self::$rawInput = $input;
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}
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return self::$rawInput;
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}
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/* -( Startup Hooks )------------------------------------------------------ */
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/**
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* @param float Request start time, from `microtime(true)`.
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* @task hook
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*/
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public static function didStartup($start_time) {
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self::$startTime = $start_time;
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self::$phases = array();
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self::$accessLog = null;
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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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$registered = true;
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}
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self::setupPHP();
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self::verifyPHP();
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// If we've made it this far, the environment isn't completely broken so
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// we can switch over to relying on our own exception recovery mechanisms.
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ini_set('display_errors', 0);
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self::connectRateLimits();
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self::normalizeInput();
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self::verifyRewriteRules();
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self::detectPostMaxSizeTriggered();
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self::beginOutputCapture();
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}
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/**
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* @task hook
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*/
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public static function didShutdown() {
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// Disconnect any active rate limits before we shut down. If we don't do
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// this, requests which exit early will lock a slot in any active
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// connection limits, and won't count for rate limits.
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self::disconnectRateLimits(array());
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$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(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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/* -( Debug Time Limit )--------------------------------------------------- */
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/**
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* Set a time limit (in seconds) for the current script. After time expires,
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* the script fatals.
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*
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* This works like `max_execution_time`, but prints out a useful stack trace
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* when the time limit expires. This is primarily intended to make it easier
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* to debug pages which hang by allowing extraction of a stack trace: set a
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* short debug limit, then use the trace to figure out what's happening.
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*
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* The limit is implemented with a tick function, so enabling it implies
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* some accounting overhead.
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*
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* @param int Time limit in seconds.
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* @return void
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*/
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public static function setDebugTimeLimit($limit) {
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self::$debugTimeLimit = $limit;
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static $initialized;
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if (!$initialized) {
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declare(ticks=1);
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register_tick_function(array(__CLASS__, 'onDebugTick'));
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}
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}
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/**
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* Callback tick function used by @{method:setDebugTimeLimit}.
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*
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* Fatals with a useful stack trace after the time limit expires.
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*
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* @return void
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*/
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public static function onDebugTick() {
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$limit = self::$debugTimeLimit;
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if (!$limit) {
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return;
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}
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$elapsed = (microtime(true) - self::getStartTime());
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if ($elapsed > $limit) {
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$frames = array();
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foreach (debug_backtrace() as $frame) {
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$file = isset($frame['file']) ? $frame['file'] : '-';
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$file = basename($file);
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$line = isset($frame['line']) ? $frame['line'] : '-';
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$class = isset($frame['class']) ? $frame['class'].'->' : null;
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$func = isset($frame['function']) ? $frame['function'].'()' : '?';
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$frames[] = "{$file}:{$line} {$class}{$func}";
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}
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self::didFatal(
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"Request aborted by debug time limit after {$limit} seconds.\n\n".
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"STACK TRACE\n".
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implode("\n", $frames));
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}
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}
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/* -( In Case of Apocalypse )---------------------------------------------- */
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/**
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* Fatal the request completely in response to an exception, sending a plain
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* text message to the client. Calls @{method:didFatal} internally.
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*
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* @param string Brief description of the exception context, like
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* `"Rendering Exception"`.
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* @param Throwable The exception itself.
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* @param bool True if it's okay to show the exception's stack trace
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* to the user. The trace will always be logged.
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* @return exit This method **does not return**.
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*
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* @task apocalypse
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*/
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public static function didEncounterFatalException(
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$note,
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$ex,
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$show_trace) {
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$message = '['.$note.'/'.get_class($ex).'] '.$ex->getMessage();
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$full_message = $message;
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$full_message .= "\n\n";
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$full_message .= $ex->getTraceAsString();
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if ($show_trace) {
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$message = $full_message;
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}
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self::didFatal($message, $full_message);
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}
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/**
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* Fatal the request completely, sending a plain text message to the client.
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*
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* @param string Plain text message to send to the client.
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* @param string Plain text message to send to the error log. If not
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* provided, the client message is used. You can pass a more
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* detailed message here (e.g., with stack traces) to avoid
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* showing it to users.
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* @return exit This method **does not return**.
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*
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* @task apocalypse
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*/
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public static function didFatal($message, $log_message = null) {
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if ($log_message === null) {
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$log_message = $message;
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}
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self::endOutputCapture();
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$access_log = self::$accessLog;
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if ($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($log_message);
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echo $message."\n";
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exit(1);
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}
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/* -( Validation )--------------------------------------------------------- */
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/**
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* @task validation
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*/
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private static function setupPHP() {
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error_reporting(E_ALL | E_STRICT);
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self::$oldMemoryLimit = ini_get('memory_limit');
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ini_set('memory_limit', -1);
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// If we have libxml, disable the incredibly dangerous entity loader.
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if (function_exists('libxml_disable_entity_loader')) {
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libxml_disable_entity_loader(true);
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}
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// See T13060. If the locale for this process (the parent process) is not
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// a UTF-8 locale we can encounter problems when launching subprocesses
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// which receive UTF-8 parameters in their command line argument list.
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@setlocale(LC_ALL, 'en_US.UTF-8');
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}
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/**
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* @task validation
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*/
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public static function getOldMemoryLimit() {
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return self::$oldMemoryLimit;
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}
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/**
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* @task validation
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*/
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private static function normalizeInput() {
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// Replace superglobals with unfiltered versions, disrespect php.ini (we
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// filter ourselves).
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// NOTE: We don't filter INPUT_SERVER because we don't want to overwrite
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// changes made in "preamble.php".
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// NOTE: WE don't filter INPUT_POST because we may be constructing it
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// lazily if "enable_post_data_reading" is disabled.
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$filter = array(
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INPUT_GET,
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INPUT_ENV,
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INPUT_COOKIE,
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);
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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 ($type) {
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case INPUT_GET:
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$_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, $filtered);
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break;
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case INPUT_ENV;
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$env = array_merge($_ENV, $filtered);
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$_ENV = self::filterEnvSuperglobal($env);
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break;
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}
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}
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self::rebuildRequest();
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}
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/**
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* @task validation
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*/
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public static function rebuildRequest() {
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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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// $_REQUEST will be empty, so leave it alone.
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return;
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}
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$_REQUEST = array();
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for ($ii = 0; $ii < strlen($order); $ii++) {
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switch ($order[$ii]) {
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case 'G':
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$_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 $_REQUEST.
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break;
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}
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}
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}
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/**
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* Adjust `$_ENV` before execution.
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*
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* Adjustments here primarily impact the environment as seen by subprocesses.
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* The environment is forwarded explicitly by @{class:ExecFuture}.
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*
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* @param map<string, wild> Input `$_ENV`.
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* @return map<string, string> Suitable `$_ENV`.
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* @task validation
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*/
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private static function filterEnvSuperglobal(array $env) {
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// In some configurations, we may get "argc" and "argv" set in $_ENV.
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// These are not real environmental variables, and "argv" may have an array
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// value which can not be forwarded to subprocesses. Remove these from the
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// environment if they are present.
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unset($env['argc']);
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unset($env['argv']);
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return $env;
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}
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|
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/**
|
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* @task validation
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|
*/
|
|
private static function verifyPHP() {
|
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$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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|
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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 ".
|
|
"feature is 'highly discouraged' by PHP's developers and you must ".
|
|
"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 ".
|
|
"cause Phabricator to fatal unrecoverably with nonsense errors). ".
|
|
"Downgrade to version 3.1.13.");
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}
|
|
}
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|
|
if (isset($_SERVER['HTTP_PROXY'])) {
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self::didFatal(
|
|
'This HTTP request included a "Proxy:" header, poisoning the '.
|
|
'environment (CVE-2016-5385 / httpoxy). Declining to process this '.
|
|
'request. For details, see: https://phurl.io/u/httpoxy');
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* @task validation
|
|
*/
|
|
private static function verifyRewriteRules() {
|
|
if (isset($_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 '/'.");
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* 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 "enable_post_data_reading" is off, we won't have $_POST and this
|
|
// condition is effectively impossible.
|
|
if (!ini_get('enable_post_data_reading')) {
|
|
return;
|
|
}
|
|
|
|
// If there's POST data, clearly we're in good shape.
|
|
if ($_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.
|
|
|
|
$config = ini_get('post_max_size');
|
|
self::didFatal(
|
|
"As received by the server, this request had a nonzero content length ".
|
|
"but no POST data.\n\n".
|
|
"Normally, this indicates that it exceeds the 'post_max_size' setting ".
|
|
"in the PHP configuration on the server. Increase the 'post_max_size' ".
|
|
"setting or reduce the size of the request.\n\n".
|
|
"Request size according to 'Content-Length' was '{$length}', ".
|
|
"'post_max_size' is set to '{$config}'.");
|
|
}
|
|
|
|
|
|
/* -( Rate Limiting )------------------------------------------------------ */
|
|
|
|
|
|
/**
|
|
* Add a new client limits.
|
|
*
|
|
* @param PhabricatorClientLimit New limit.
|
|
* @return PhabricatorClientLimit The limit.
|
|
*/
|
|
public static function addRateLimit(PhabricatorClientLimit $limit) {
|
|
self::$limits[] = $limit;
|
|
return $limit;
|
|
}
|
|
|
|
|
|
/**
|
|
* Apply configured rate limits.
|
|
*
|
|
* If any limit is exceeded, this method terminates the request.
|
|
*
|
|
* @return void
|
|
* @task ratelimit
|
|
*/
|
|
private static function connectRateLimits() {
|
|
$limits = self::$limits;
|
|
|
|
$reason = null;
|
|
$connected = array();
|
|
foreach ($limits as $limit) {
|
|
$reason = $limit->didConnect();
|
|
$connected[] = $limit;
|
|
if ($reason !== null) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we're killing the request here, disconnect any limits that we
|
|
// connected to try to keep the accounting straight.
|
|
if ($reason !== null) {
|
|
foreach ($connected as $limit) {
|
|
$limit->didDisconnect(array());
|
|
}
|
|
|
|
self::didRateLimit($reason);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Tear down rate limiting and allow limits to score the request.
|
|
*
|
|
* @param map<string, wild> Additional, freeform request state.
|
|
* @return void
|
|
* @task ratelimit
|
|
*/
|
|
public static function disconnectRateLimits(array $request_state) {
|
|
$limits = self::$limits;
|
|
|
|
// Remove all limits before disconnecting them so this works properly if
|
|
// it runs twice. (We run this automatically as a shutdown handler.)
|
|
self::$limits = array();
|
|
|
|
foreach ($limits as $limit) {
|
|
$limit->didDisconnect($request_state);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Emit an HTTP 429 "Too Many Requests" response (indicating that the user
|
|
* has exceeded application rate limits) and exit.
|
|
*
|
|
* @return exit This method **does not return**.
|
|
* @task ratelimit
|
|
*/
|
|
private static function didRateLimit($reason) {
|
|
header(
|
|
'Content-Type: text/plain; charset=utf-8',
|
|
$replace = true,
|
|
$http_error = 429);
|
|
|
|
echo $reason;
|
|
|
|
exit(1);
|
|
}
|
|
|
|
|
|
/* -( Startup Timers )----------------------------------------------------- */
|
|
|
|
|
|
/**
|
|
* Record the beginning of a new startup phase.
|
|
*
|
|
* For phases which occur before @{class:PhabricatorStartup} loads, save the
|
|
* time and record it with @{method:recordStartupPhase} after the class is
|
|
* available.
|
|
*
|
|
* @param string Phase name.
|
|
* @task phases
|
|
*/
|
|
public static function beginStartupPhase($phase) {
|
|
self::recordStartupPhase($phase, microtime(true));
|
|
}
|
|
|
|
|
|
/**
|
|
* Record the start time of a previously executed startup phase.
|
|
*
|
|
* For startup phases which occur after @{class:PhabricatorStartup} loads,
|
|
* use @{method:beginStartupPhase} instead. This method can be used to
|
|
* record a time before the class loads, then hand it over once the class
|
|
* becomes available.
|
|
*
|
|
* @param string Phase name.
|
|
* @param float Phase start time, from `microtime(true)`.
|
|
* @task phases
|
|
*/
|
|
public static function recordStartupPhase($phase, $time) {
|
|
self::$phases[$phase] = $time;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get information about startup phase timings.
|
|
*
|
|
* Sometimes, performance problems can occur before we start the profiler.
|
|
* Since the profiler can't examine these phases, it isn't useful in
|
|
* understanding their performance costs.
|
|
*
|
|
* Instead, the startup process marks when it enters various phases using
|
|
* @{method:beginStartupPhase}. A later call to this method can retrieve this
|
|
* information, which can be examined to gain greater insight into where
|
|
* time was spent. The output is still crude, but better than nothing.
|
|
*
|
|
* @task phases
|
|
*/
|
|
public static function getPhases() {
|
|
return self::$phases;
|
|
}
|
|
|
|
}
|