Add a policy for disabling the stripping of PAC URLs.

chrome/common/pref_names.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
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 #if BUILDFLAG(ANDROID_JAVA_UI)
 // A list of partner bookmark rename/remove mappings.
 // Each list item is a dictionary containing a "url", a "provider_title" and
 // "mapped_title" entries, detailing the bookmark target URL (if any), the title
 // given by the PartnerBookmarksProvider and either the user-visible renamed
 // title or an empty string if the bookmark node was removed.
 const char kPartnerBookmarkMappings[] = "partnerbookmarks.mappings";
 #endif
 
 // Whether DNS Quick Check is disabled in proxy resolution.
+//
+// This is a performance optimization for WPAD (Web Proxy
+// Auto-Discovery) which places a 1 second timeout on resolving the
+// DNS for PAC script URLs.
+//
+// It is on by default, but can be disabled via the Policy option
+// "WPADQuickCheckEnbled". There is no other UI for changing this
+// preference.
+//
+// For instance, if the DNS resolution for 'wpad' takes longer than 1
+// second, auto-detection will give up and fallback to the next proxy
+// configuration (which could be manually configured proxy server
+// rules, or an implicit fallback to DIRECT connections).
 const char kQuickCheckEnabled[] = "proxy.quick_check_enabled";
 
+// Whether PAC scripts are given a stripped https:// URL (enabled), or
+// the full URL for https:// (disabled).
+//
+// This is a security feature which is on by default, and prevents PAC
+// scripts (which may have been sourced in an untrusted manner) from
+// having access to data that is ordinarily protected by a TLS channel
+// (i.e. the path and query components of an https:// URL).
+//
+// This preference is not exposed in the UI, but is overridable using
+// a Policy (PacHttpsUrlStrippingEnabled), or using a commandline
+// flag --unsafe-pac-url.
+//
+// The ability to turn off this security feature is not intended to be
+// a long-lived feature, but rather an escape-hatch for enterprises
+// while rolling out the change to PAC.
+const char kPacHttpsUrlStrippingEnabled[] =
+    "proxy.pac_https_url_stripping_enabled";
+
 // Whether Guest Mode is enabled within the browser.
 const char kBrowserGuestModeEnabled[] = "profile.browser_guest_enabled";
 
 // Whether Adding a new Person is enabled within the user manager.
 const char kBrowserAddPersonEnabled[] = "profile.add_person_enabled";
 
 // Device identifier used by Easy Unlock stored in local state. This id will be
 // combined with a user id, before being registered with the CryptAuth server,
 // so it can't correlate users on the same device.
 const char kEasyUnlockDeviceId[] = "easy_unlock.device_id";
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 const char kMediaRouterEnableCloudServices[] =
     "media_router.cloudservices.enabled";
 #endif  // defined(GOOGLE_CHROME_BUILD)
 // Whether or not the Media Router first run flow has been acknowledged by the
 // user.
 const char kMediaRouterFirstRunFlowAcknowledged[] =
     "media_router.firstrunflow.acknowledged";
 #endif
 
 }  // namespace prefs