chrome/browser/renderer_host/safe_browsing_resource_throttle.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/renderer_host/safe_browsing_resource_throttle.h"
   6
   7 #include "base/logging.h"
   8 #include "chrome/browser/browser_process.h"
   9 #include "chrome/browser/prerender/prerender_contents.h"
  10 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "content/public/browser/render_view_host.h"
  13 #include "content/public/browser/resource_controller.h"
  14 #include "content/public/browser/resource_request_info.h"
  15 #include "content/public/browser/web_contents.h"
  16 #include "net/base/load_flags.h"
  17 #include "net/url_request/url_request.h"
  18
  19 // Maximum time in milliseconds to wait for the safe browsing service to
  20 // verify a URL. After this amount of time the outstanding check will be
  21 // aborted, and the URL will be treated as if it were safe.
  22 static const int kCheckUrlTimeoutMs = 5000;
  23
  24 // TODO(eroman): Downgrade these CHECK()s to DCHECKs once there is more
  25 //               unit test coverage.
  26
  27 SafeBrowsingResourceThrottle::SafeBrowsingResourceThrottle(
  28     const net::URLRequest* request,
  29     content::ResourceType resource_type,
  30     SafeBrowsingService* safe_browsing)
  31     : state_(STATE_NONE),
  32       defer_state_(DEFERRED_NONE),
  33       threat_type_(SB_THREAT_TYPE_SAFE),
  34       database_manager_(safe_browsing->database_manager()),
  35       ui_manager_(safe_browsing->ui_manager()),
  36       request_(request),
  37       is_subresource_(resource_type != content::RESOURCE_TYPE_MAIN_FRAME),
  38       is_subframe_(resource_type == content::RESOURCE_TYPE_SUB_FRAME) {
  39 }
  40
  41 SafeBrowsingResourceThrottle::~SafeBrowsingResourceThrottle() {
  42   if (state_ == STATE_CHECKING_URL)
  43     database_manager_->CancelCheck(this);
  44 }
  45
  46 void SafeBrowsingResourceThrottle::WillStartRequest(bool* defer) {
  47   // We need to check the new URL before starting the request.
  48   if (CheckUrl(request_->url()))
  49     return;
  50
  51   // If the URL couldn't be verified synchronously, defer starting the
  52   // request until the check has completed.
  53   defer_state_ = DEFERRED_START;
  54   *defer = true;
  55 }
  56
  57 void SafeBrowsingResourceThrottle::WillRedirectRequest(const GURL& new_url,
  58                                                        bool* defer) {
  59   CHECK(state_ == STATE_NONE);
  60   CHECK(defer_state_ == DEFERRED_NONE);
  61
  62   // Save the redirect urls for possible malware detail reporting later.
  63   redirect_urls_.push_back(new_url);
  64
  65   // We need to check the new URL before following the redirect.
  66   if (CheckUrl(new_url))
  67     return;
  68
  69   // If the URL couldn't be verified synchronously, defer following the
  70   // redirect until the SafeBrowsing check is complete. Store the redirect
  71   // context so we can pass it on to other handlers once we have completed
  72   // our check.
  73   defer_state_ = DEFERRED_REDIRECT;
  74   *defer = true;
  75 }
  76
  77 const char* SafeBrowsingResourceThrottle::GetNameForLogging() const {
  78   return "SafeBrowsingResourceThrottle";
  79 }
  80
  81 // SafeBrowsingService::Client implementation, called on the IO thread once
  82 // the URL has been classified.
  83 void SafeBrowsingResourceThrottle::OnCheckBrowseUrlResult(
  84     const GURL& url,
  85     SBThreatType threat_type,
  86     const std::string& metadata) {
  87   CHECK(state_ == STATE_CHECKING_URL);
  88   CHECK(defer_state_ != DEFERRED_NONE);
  89   CHECK(url == url_being_checked_) << "Was expecting: " << url_being_checked_
  90                                    << " but got: " << url;
  91
  92 #if defined(OS_ANDROID)
  93   // Temporarily disable SB interstitial during Finch experiment.
  94   // The database check is still exercised, but the interstitial never shown.
  95   threat_type = SB_THREAT_TYPE_SAFE;
  96 #endif
  97
  98   timer_.Stop();  // Cancel the timeout timer.
  99   threat_type_ = threat_type;
 100   state_ = STATE_NONE;
 101
 102   if (threat_type == SB_THREAT_TYPE_SAFE) {
 103     // Log how much time the safe browsing check cost us.
 104     ui_manager_->LogPauseDelay(base::TimeTicks::Now() - url_check_start_time_);
 105
 106     // Continue the request.
 107     ResumeRequest();
 108     return;
 109   }
 110
 111   if (request_->load_flags() & net::LOAD_PREFETCH) {
 112     // Don't prefetch resources that fail safe browsing, disallow
 113     // them.
 114     controller()->Cancel();
 115     return;
 116   }
 117
 118   const content::ResourceRequestInfo* info =
 119       content::ResourceRequestInfo::ForRequest(request_);
 120
 121   SafeBrowsingUIManager::UnsafeResource resource;
 122   resource.url = url;
 123   resource.original_url = request_->original_url();
 124   resource.redirect_urls = redirect_urls_;
 125   resource.is_subresource = is_subresource_;
 126   resource.is_subframe = is_subframe_;
 127   resource.threat_type = threat_type;
 128   resource.threat_metadata = metadata;
 129   resource.callback = base::Bind(
 130       &SafeBrowsingResourceThrottle::OnBlockingPageComplete, AsWeakPtr());
 131   resource.render_process_host_id = info->GetChildID();
 132   resource.render_view_id =  info->GetRouteID();
 133
 134   state_ = STATE_DISPLAYING_BLOCKING_PAGE;
 135
 136   content::BrowserThread::PostTask(
 137       content::BrowserThread::UI,
 138       FROM_HERE,
 139       base::Bind(&SafeBrowsingResourceThrottle::StartDisplayingBlockingPage,
 140                  AsWeakPtr(), ui_manager_, resource));
 141 }
 142
 143 void SafeBrowsingResourceThrottle::StartDisplayingBlockingPage(
 144     const base::WeakPtr<SafeBrowsingResourceThrottle>& throttle,
 145     scoped_refptr<SafeBrowsingUIManager> ui_manager,
 146     const SafeBrowsingUIManager::UnsafeResource& resource) {
 147   bool should_show_blocking_page = true;
 148
 149   content::RenderViewHost* rvh = content::RenderViewHost::FromID(
 150       resource.render_process_host_id, resource.render_view_id);
 151   if (rvh) {
 152     content::WebContents* web_contents =
 153         content::WebContents::FromRenderViewHost(rvh);
 154     prerender::PrerenderContents* prerender_contents =
 155         prerender::PrerenderContents::FromWebContents(web_contents);
 156     if (prerender_contents) {
 157       prerender_contents->Destroy(prerender::FINAL_STATUS_SAFE_BROWSING);
 158       should_show_blocking_page = false;
 159     }
 160
 161     if (should_show_blocking_page)  {
 162       ui_manager->DisplayBlockingPage(resource);
 163       return;
 164     }
 165   }
 166
 167   // Tab is gone or it's being prerendered.
 168   content::BrowserThread::PostTask(
 169       content::BrowserThread::IO,
 170       FROM_HERE,
 171       base::Bind(&SafeBrowsingResourceThrottle::Cancel, throttle));
 172 }
 173
 174 void SafeBrowsingResourceThrottle::Cancel() {
 175   controller()->Cancel();
 176 }
 177
 178 // SafeBrowsingService::UrlCheckCallback implementation, called on the IO
 179 // thread when the user has decided to proceed with the current request, or
 180 // go back.
 181 void SafeBrowsingResourceThrottle::OnBlockingPageComplete(bool proceed) {
 182   CHECK(state_ == STATE_DISPLAYING_BLOCKING_PAGE);
 183   state_ = STATE_NONE;
 184
 185   if (proceed) {
 186     threat_type_ = SB_THREAT_TYPE_SAFE;
 187     ResumeRequest();
 188   } else {
 189     controller()->Cancel();
 190   }
 191 }
 192
 193 bool SafeBrowsingResourceThrottle::CheckUrl(const GURL& url) {
 194   CHECK(state_ == STATE_NONE);
 195   bool succeeded_synchronously = database_manager_->CheckBrowseUrl(url, this);
 196   if (succeeded_synchronously) {
 197     threat_type_ = SB_THREAT_TYPE_SAFE;
 198     ui_manager_->LogPauseDelay(base::TimeDelta());  // No delay.
 199     return true;
 200   }
 201
 202   state_ = STATE_CHECKING_URL;
 203   url_being_checked_ = url;
 204
 205   // Record the start time of the check.
 206   url_check_start_time_ = base::TimeTicks::Now();
 207
 208   // Start a timer to abort the check if it takes too long.
 209   timer_.Start(FROM_HERE,
 210                base::TimeDelta::FromMilliseconds(kCheckUrlTimeoutMs),
 211                this, &SafeBrowsingResourceThrottle::OnCheckUrlTimeout);
 212
 213   return false;
 214 }
 215
 216 void SafeBrowsingResourceThrottle::OnCheckUrlTimeout() {
 217   CHECK(state_ == STATE_CHECKING_URL);
 218   CHECK(defer_state_ != DEFERRED_NONE);
 219
 220   database_manager_->CancelCheck(this);
 221   OnCheckBrowseUrlResult(
 222       url_being_checked_, SB_THREAT_TYPE_SAFE, std::string());
 223 }
 224
 225 void SafeBrowsingResourceThrottle::ResumeRequest() {
 226   CHECK(state_ == STATE_NONE);
 227   CHECK(defer_state_ != DEFERRED_NONE);
 228
 229   defer_state_ = DEFERRED_NONE;
 230   controller()->Resume();
 231 }