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/redirect_info.h"
  18 #include "net/url_request/url_request.h"
  19
  20 // Maximum time in milliseconds to wait for the safe browsing service to
  21 // verify a URL. After this amount of time the outstanding check will be
  22 // aborted, and the URL will be treated as if it were safe.
  23 static const int kCheckUrlTimeoutMs = 5000;
  24
  25 // TODO(eroman): Downgrade these CHECK()s to DCHECKs once there is more
  26 //               unit test coverage.
  27
  28 SafeBrowsingResourceThrottle::SafeBrowsingResourceThrottle(
  29     const net::URLRequest* request,
  30     content::ResourceType resource_type,
  31     SafeBrowsingService* safe_browsing)
  32     : state_(STATE_NONE),
  33       defer_state_(DEFERRED_NONE),
  34       threat_type_(SB_THREAT_TYPE_SAFE),
  35       database_manager_(safe_browsing->database_manager()),
  36       ui_manager_(safe_browsing->ui_manager()),
  37       request_(request),
  38       is_subresource_(resource_type != content::RESOURCE_TYPE_MAIN_FRAME),
  39       is_subframe_(resource_type == content::RESOURCE_TYPE_SUB_FRAME) {
  40 }
  41
  42 SafeBrowsingResourceThrottle::~SafeBrowsingResourceThrottle() {
  43   if (state_ == STATE_CHECKING_URL)
  44     database_manager_->CancelCheck(this);
  45 }
  46
  47 void SafeBrowsingResourceThrottle::WillStartRequest(bool* defer) {
  48   // We need to check the new URL before starting the request.
  49   if (CheckUrl(request_->url()))
  50     return;
  51
  52   // If the URL couldn't be verified synchronously, defer starting the
  53   // request until the check has completed.
  54   defer_state_ = DEFERRED_START;
  55   *defer = true;
  56 }
  57
  58 void SafeBrowsingResourceThrottle::WillRedirectRequest(
  59     const net::RedirectInfo& redirect_info,
  60     bool* defer) {
  61   CHECK(state_ == STATE_NONE);
  62   CHECK(defer_state_ == DEFERRED_NONE);
  63
  64   // Save the redirect urls for possible malware detail reporting later.
  65   redirect_urls_.push_back(redirect_info.new_url);
  66
  67   // We need to check the new URL before following the redirect.
  68   if (CheckUrl(redirect_info.new_url))
  69     return;
  70
  71   // If the URL couldn't be verified synchronously, defer following the
  72   // redirect until the SafeBrowsing check is complete. Store the redirect
  73   // context so we can pass it on to other handlers once we have completed
  74   // our check.
  75   defer_state_ = DEFERRED_REDIRECT;
  76   *defer = true;
  77 }
  78
  79 const char* SafeBrowsingResourceThrottle::GetNameForLogging() const {
  80   return "SafeBrowsingResourceThrottle";
  81 }
  82
  83 // SafeBrowsingService::Client implementation, called on the IO thread once
  84 // the URL has been classified.
  85 void SafeBrowsingResourceThrottle::OnCheckBrowseUrlResult(
  86     const GURL& url,
  87     SBThreatType threat_type,
  88     const std::string& metadata) {
  89   CHECK(state_ == STATE_CHECKING_URL);
  90   CHECK(defer_state_ != DEFERRED_NONE);
  91   CHECK(url == url_being_checked_) << "Was expecting: " << url_being_checked_
  92                                    << " but got: " << url;
  93
  94 #if defined(OS_ANDROID)
  95   // Temporarily disable SB interstitial during Finch experiment.
  96   // The database check is still exercised, but the interstitial never shown.
  97   threat_type = SB_THREAT_TYPE_SAFE;
  98 #endif
  99
 100   timer_.Stop();  // Cancel the timeout timer.
 101   threat_type_ = threat_type;
 102   state_ = STATE_NONE;
 103
 104   if (threat_type == SB_THREAT_TYPE_SAFE) {
 105     // Log how much time the safe browsing check cost us.
 106     ui_manager_->LogPauseDelay(base::TimeTicks::Now() - url_check_start_time_);
 107
 108     // Continue the request.
 109     ResumeRequest();
 110     return;
 111   }
 112
 113   if (request_->load_flags() & net::LOAD_PREFETCH) {
 114     // Don't prefetch resources that fail safe browsing, disallow
 115     // them.
 116     controller()->Cancel();
 117     return;
 118   }
 119
 120   const content::ResourceRequestInfo* info =
 121       content::ResourceRequestInfo::ForRequest(request_);
 122
 123   SafeBrowsingUIManager::UnsafeResource resource;
 124   resource.url = url;
 125   resource.original_url = request_->original_url();
 126   resource.redirect_urls = redirect_urls_;
 127   resource.is_subresource = is_subresource_;
 128   resource.is_subframe = is_subframe_;
 129   resource.threat_type = threat_type;
 130   resource.threat_metadata = metadata;
 131   resource.callback = base::Bind(
 132       &SafeBrowsingResourceThrottle::OnBlockingPageComplete, AsWeakPtr());
 133   resource.render_process_host_id = info->GetChildID();
 134   resource.render_view_id =  info->GetRouteID();
 135
 136   state_ = STATE_DISPLAYING_BLOCKING_PAGE;
 137
 138   content::BrowserThread::PostTask(
 139       content::BrowserThread::UI,
 140       FROM_HERE,
 141       base::Bind(&SafeBrowsingResourceThrottle::StartDisplayingBlockingPage,
 142                  AsWeakPtr(), ui_manager_, resource));
 143 }
 144
 145 void SafeBrowsingResourceThrottle::StartDisplayingBlockingPage(
 146     const base::WeakPtr<SafeBrowsingResourceThrottle>& throttle,
 147     scoped_refptr<SafeBrowsingUIManager> ui_manager,
 148     const SafeBrowsingUIManager::UnsafeResource& resource) {
 149   bool should_show_blocking_page = true;
 150
 151   content::RenderViewHost* rvh = content::RenderViewHost::FromID(
 152       resource.render_process_host_id, resource.render_view_id);
 153   if (rvh) {
 154     content::WebContents* web_contents =
 155         content::WebContents::FromRenderViewHost(rvh);
 156     prerender::PrerenderContents* prerender_contents =
 157         prerender::PrerenderContents::FromWebContents(web_contents);
 158     if (prerender_contents) {
 159       prerender_contents->Destroy(prerender::FINAL_STATUS_SAFE_BROWSING);
 160       should_show_blocking_page = false;
 161     }
 162
 163     if (should_show_blocking_page)  {
 164       ui_manager->DisplayBlockingPage(resource);
 165       return;
 166     }
 167   }
 168
 169   // Tab is gone or it's being prerendered.
 170   content::BrowserThread::PostTask(
 171       content::BrowserThread::IO,
 172       FROM_HERE,
 173       base::Bind(&SafeBrowsingResourceThrottle::Cancel, throttle));
 174 }
 175
 176 void SafeBrowsingResourceThrottle::Cancel() {
 177   controller()->Cancel();
 178 }
 179
 180 // SafeBrowsingService::UrlCheckCallback implementation, called on the IO
 181 // thread when the user has decided to proceed with the current request, or
 182 // go back.
 183 void SafeBrowsingResourceThrottle::OnBlockingPageComplete(bool proceed) {
 184   CHECK(state_ == STATE_DISPLAYING_BLOCKING_PAGE);
 185   state_ = STATE_NONE;
 186
 187   if (proceed) {
 188     threat_type_ = SB_THREAT_TYPE_SAFE;
 189     ResumeRequest();
 190   } else {
 191     controller()->Cancel();
 192   }
 193 }
 194
 195 bool SafeBrowsingResourceThrottle::CheckUrl(const GURL& url) {
 196   CHECK(state_ == STATE_NONE);
 197   bool succeeded_synchronously = database_manager_->CheckBrowseUrl(url, this);
 198   if (succeeded_synchronously) {
 199     threat_type_ = SB_THREAT_TYPE_SAFE;
 200     ui_manager_->LogPauseDelay(base::TimeDelta());  // No delay.
 201     return true;
 202   }
 203
 204   state_ = STATE_CHECKING_URL;
 205   url_being_checked_ = url;
 206
 207   // Record the start time of the check.
 208   url_check_start_time_ = base::TimeTicks::Now();
 209
 210   // Start a timer to abort the check if it takes too long.
 211   timer_.Start(FROM_HERE,
 212                base::TimeDelta::FromMilliseconds(kCheckUrlTimeoutMs),
 213                this, &SafeBrowsingResourceThrottle::OnCheckUrlTimeout);
 214
 215   return false;
 216 }
 217
 218 void SafeBrowsingResourceThrottle::OnCheckUrlTimeout() {
 219   CHECK(state_ == STATE_CHECKING_URL);
 220   CHECK(defer_state_ != DEFERRED_NONE);
 221
 222   database_manager_->CancelCheck(this);
 223   OnCheckBrowseUrlResult(
 224       url_being_checked_, SB_THREAT_TYPE_SAFE, std::string());
 225 }
 226
 227 void SafeBrowsingResourceThrottle::ResumeRequest() {
 228   CHECK(state_ == STATE_NONE);
 229   CHECK(defer_state_ != DEFERRED_NONE);
 230
 231   defer_state_ = DEFERRED_NONE;
 232   controller()->Resume();
 233 }