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Remove the (hopefully) obsolete "post_max_size" check during startup

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Summary:
Ref T13507. See that task for discussion. This check appears to be obsolete in all common cases and misfires if the client submits compressed requests.

Since the cases where it could still trigger correctly are extremely rare and should still have plausible behavior, just remove it.

Test Plan: Grepped for calls.

Maniphest Tasks: T13507

Differential Revision: https://secure.phabricator.com/D21077
This commit is contained in:
epriestley 2020-04-09 13:24:19 -07:00
parent 58fbf64a27
commit a2fb91b8af
1 changed files with 0 additions and 100 deletions
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100
support/startup/PhabricatorStartup.php
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@ -142,8 +142,6 @@ final class PhabricatorStartup {
self::verifyRewriteRules();
self::detectPostMaxSizeTriggered();
self::beginOutputCapture();
}
@ -583,104 +581,6 @@ final class PhabricatorStartup {
}
/**
* 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 )------------------------------------------------------ */