Phabricator404Controller.php
a6c4117ec434production

Phabricator404Controller.php
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			<?php

			final class Phabricator404Controller extends PhabricatorController {

			public function shouldRequireLogin() {

			// NOTE: See T2102 for discussion. When a logged-out user requests a page,
			// we give them a login form and set a `next_uri` cookie so we send them
			// back to the page they requested after they login. However, some browsers
			// or extensions request resources which may not exist (like
			// "apple-touch-icon.png" and "humans.txt") and these requests may overwrite
			// the stored "next_uri" after the login page loads. Our options for dealing
			// with this are all bad:
			//
			// 1. We can't put the URI in the form because some login methods (OAuth2)
			// issue redirects to third-party sites. After T1536 we might be able
			// to.
			// 2. We could set the cookie only if it doesn't exist, but then a user who
			// declines to login will end up in the wrong place if they later do
			// login.
			// 3. We can blacklist all the resources browsers request, but this is a
			// mess.
			// 4. We can just allow users to access the 404 page without login, so
			// requesting bad URIs doesn't set the cookie.
			//
			// This implements (4). The main downside is that an attacker can now detect
			// if a URI is routable (i.e., some application is installed) by testing for
			// 404 vs login. If possible, we should implement T1536 in such a way that
			// we can pass the next URI through the login process.

			return false;
			}

			public function processRequest() {
			return new Aphront404Response();
			}

			}