chrome/browser/extensions/api/web_request/web_request_permissions.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/api/web_request/web_request_permissions.h"
   6
   7 #include "base/strings/string_util.h"
   8 #include "base/strings/stringprintf.h"
   9 #include "chrome/browser/extensions/extension_renderer_state.h"
  10 #include "chrome/common/extensions/extension_constants.h"
  11 #include "chrome/common/url_constants.h"
  12 #include "content/public/browser/resource_request_info.h"
  13 #include "extensions/browser/info_map.h"
  14 #include "extensions/common/constants.h"
  15 #include "extensions/common/extension.h"
  16 #include "extensions/common/permissions/permissions_data.h"
  17 #include "net/url_request/url_request.h"
  18 #include "url/gurl.h"
  19
  20 using content::ResourceRequestInfo;
  21
  22 namespace {
  23
  24 // Returns true if the URL is sensitive and requests to this URL must not be
  25 // modified/canceled by extensions, e.g. because it is targeted to the webstore
  26 // to check for updates, extension blacklisting, etc.
  27 bool IsSensitiveURL(const GURL& url) {
  28   // TODO(battre) Merge this, CanExtensionAccessURL and
  29   // PermissionsData::CanExecuteScriptOnPage into one function.
  30   bool sensitive_chrome_url = false;
  31   const std::string host = url.host();
  32   const char kGoogleCom[] = ".google.com";
  33   const char kClient[] = "clients";
  34   if (EndsWith(host, kGoogleCom, true)) {
  35     // Check for "clients[0-9]*.google.com" hosts.
  36     // This protects requests to several internal services such as sync,
  37     // extension update pings, captive portal detection, fraudulent certificate
  38     // reporting, autofill and others.
  39     if (StartsWithASCII(host, kClient, true)) {
  40       bool match = true;
  41       for (std::string::const_iterator i = host.begin() + strlen(kClient),
  42                end = host.end() - strlen(kGoogleCom); i != end; ++i) {
  43         if (!isdigit(*i)) {
  44           match = false;
  45           break;
  46         }
  47       }
  48       sensitive_chrome_url = sensitive_chrome_url || match;
  49     }
  50     // This protects requests to safe browsing, link doctor, and possibly
  51     // others.
  52     sensitive_chrome_url = sensitive_chrome_url ||
  53         EndsWith(url.host(), ".clients.google.com", true) ||
  54         url.host() == "sb-ssl.google.com" ||
  55         (url.host() ==  "chrome.google.com" &&
  56              StartsWithASCII(url.path(), "/webstore", true));
  57   }
  58   GURL::Replacements replacements;
  59   replacements.ClearQuery();
  60   replacements.ClearRef();
  61   GURL url_without_query = url.ReplaceComponents(replacements);
  62   return sensitive_chrome_url ||
  63       extension_urls::IsWebstoreUpdateUrl(url_without_query) ||
  64       extension_urls::IsBlacklistUpdateUrl(url);
  65 }
  66
  67 // Returns true if the scheme is one we want to allow extensions to have access
  68 // to. Extensions still need specific permissions for a given URL, which is
  69 // covered by CanExtensionAccessURL.
  70 bool HasWebRequestScheme(const GURL& url) {
  71   return (url.SchemeIs(content::kAboutScheme) ||
  72           url.SchemeIs(content::kFileScheme) ||
  73           url.SchemeIs(content::kFileSystemScheme) ||
  74           url.SchemeIs(content::kFtpScheme) ||
  75           url.SchemeIs(content::kHttpScheme) ||
  76           url.SchemeIs(content::kHttpsScheme) ||
  77           url.SchemeIs(extensions::kExtensionScheme));
  78 }
  79
  80 }  // namespace
  81
  82 // static
  83 bool WebRequestPermissions::HideRequest(
  84     const extensions::InfoMap* extension_info_map,
  85     const net::URLRequest* request) {
  86   // Hide requests from the Chrome WebStore App or signin process.
  87   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
  88   if (info) {
  89     int process_id = info->GetChildID();
  90     int route_id = info->GetRouteID();
  91     ExtensionRendererState::WebViewInfo webview_info;
  92     // Never hide requests from guest processes.
  93     if (ExtensionRendererState::GetInstance()->GetWebViewInfo(
  94         process_id, route_id, &webview_info)) {
  95       return false;
  96     }
  97     if (extension_info_map && (
  98         extension_info_map->IsSigninProcess(process_id) ||
  99         extension_info_map->process_map().Contains(
 100             extension_misc::kWebStoreAppId, process_id))) {
 101       return true;
 102     }
 103   }
 104
 105   const GURL& url = request->url();
 106   return IsSensitiveURL(url) || !HasWebRequestScheme(url);
 107 }
 108
 109 // static
 110 bool WebRequestPermissions::CanExtensionAccessURL(
 111     const extensions::InfoMap* extension_info_map,
 112     const std::string& extension_id,
 113     const GURL& url,
 114     bool crosses_incognito,
 115     HostPermissionsCheck host_permissions_check) {
 116   // extension_info_map can be NULL in testing.
 117   if (!extension_info_map)
 118     return true;
 119
 120   const extensions::Extension* extension =
 121       extension_info_map->extensions().GetByID(extension_id);
 122   if (!extension)
 123     return false;
 124
 125   // Check if this event crosses incognito boundaries when it shouldn't.
 126   if (crosses_incognito && !extension_info_map->CanCrossIncognito(extension))
 127     return false;
 128
 129   switch (host_permissions_check) {
 130     case DO_NOT_CHECK_HOST:
 131       break;
 132     case REQUIRE_HOST_PERMISSION:
 133       // about: URLs are not covered in host permissions, but are allowed
 134       // anyway.
 135       if (!((url.SchemeIs(content::kAboutScheme) ||
 136              extensions::PermissionsData::HasHostPermission(extension, url) ||
 137              url.GetOrigin() == extension->url()))) {
 138         return false;
 139       }
 140       break;
 141     case REQUIRE_ALL_URLS:
 142       if (!extensions::PermissionsData::HasEffectiveAccessToAllHosts(extension))
 143         return false;
 144       break;
 145   }
 146
 147   return true;
 148 }