src/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     bool is_subresource,
  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_(is_subresource) {
  38 }
  39
  40 SafeBrowsingResourceThrottle::~SafeBrowsingResourceThrottle() {
  41   if (state_ == STATE_CHECKING_URL)
  42     database_manager_->CancelCheck(this);
  43 }
  44
  45 void SafeBrowsingResourceThrottle::WillStartRequest(bool* defer) {
  46   // We need to check the new URL before starting the request.
  47   if (CheckUrl(request_->url()))
  48     return;
  49
  50   // If the URL couldn't be verified synchronously, defer starting the
  51   // request until the check has completed.
  52   defer_state_ = DEFERRED_START;
  53   *defer = true;
  54 }
  55
  56 void SafeBrowsingResourceThrottle::WillRedirectRequest(const GURL& new_url,
  57                                                        bool* defer) {
  58   CHECK(state_ == STATE_NONE);
  59   CHECK(defer_state_ == DEFERRED_NONE);
  60
  61   // Save the redirect urls for possible malware detail reporting later.
  62   redirect_urls_.push_back(new_url);
  63
  64   // We need to check the new URL before following the redirect.
  65   if (CheckUrl(new_url))
  66     return;
  67
  68   // If the URL couldn't be verified synchronously, defer following the
  69   // redirect until the SafeBrowsing check is complete. Store the redirect
  70   // context so we can pass it on to other handlers once we have completed
  71   // our check.
  72   defer_state_ = DEFERRED_REDIRECT;
  73   *defer = true;
  74 }
  75
  76 const char* SafeBrowsingResourceThrottle::GetNameForLogging() const {
  77   return "SafeBrowsingResourceThrottle";
  78 }
  79
  80 // SafeBrowsingService::Client implementation, called on the IO thread once
  81 // the URL has been classified.
  82 void SafeBrowsingResourceThrottle::OnCheckBrowseUrlResult(
  83     const GURL& url, SBThreatType threat_type) {
  84   CHECK(state_ == STATE_CHECKING_URL);
  85   CHECK(defer_state_ != DEFERRED_NONE);
  86   CHECK(url == url_being_checked_) << "Was expecting: " << url_being_checked_
  87                                    << " but got: " << url;
  88
  89   timer_.Stop();  // Cancel the timeout timer.
  90   threat_type_ = threat_type;
  91   state_ = STATE_NONE;
  92
  93   if (threat_type == SB_THREAT_TYPE_SAFE) {
  94     // Log how much time the safe browsing check cost us.
  95     ui_manager_->LogPauseDelay(base::TimeTicks::Now() - url_check_start_time_);
  96
  97     // Continue the request.
  98     ResumeRequest();
  99     return;
 100   }
 101
 102   if (request_->load_flags() & net::LOAD_PREFETCH) {
 103     // Don't prefetch resources that fail safe browsing, disallow
 104     // them.
 105     controller()->Cancel();
 106     return;
 107   }
 108
 109   const content::ResourceRequestInfo* info =
 110       content::ResourceRequestInfo::ForRequest(request_);
 111
 112   SafeBrowsingUIManager::UnsafeResource resource;
 113   resource.url = url;
 114   resource.original_url = request_->original_url();
 115   resource.redirect_urls = redirect_urls_;
 116   resource.is_subresource = is_subresource_;
 117   resource.threat_type = threat_type;
 118   resource.callback = base::Bind(
 119       &SafeBrowsingResourceThrottle::OnBlockingPageComplete, AsWeakPtr());
 120   resource.render_process_host_id = info->GetChildID();
 121   resource.render_view_id =  info->GetRouteID();
 122
 123   state_ = STATE_DISPLAYING_BLOCKING_PAGE;
 124
 125   content::BrowserThread::PostTask(
 126       content::BrowserThread::UI,
 127       FROM_HERE,
 128       base::Bind(&SafeBrowsingResourceThrottle::StartDisplayingBlockingPage,
 129                  AsWeakPtr(), ui_manager_, resource));
 130 }
 131
 132 void SafeBrowsingResourceThrottle::StartDisplayingBlockingPage(
 133     const base::WeakPtr<SafeBrowsingResourceThrottle>& throttle,
 134     scoped_refptr<SafeBrowsingUIManager> ui_manager,
 135     const SafeBrowsingUIManager::UnsafeResource& resource) {
 136   bool should_show_blocking_page = true;
 137
 138   content::RenderViewHost* rvh = content::RenderViewHost::FromID(
 139       resource.render_process_host_id, resource.render_view_id);
 140   if (rvh) {
 141     content::WebContents* web_contents =
 142         content::WebContents::FromRenderViewHost(rvh);
 143     prerender::PrerenderContents* prerender_contents =
 144         prerender::PrerenderContents::FromWebContents(web_contents);
 145     if (prerender_contents) {
 146       prerender_contents->Destroy(prerender::FINAL_STATUS_SAFE_BROWSING);
 147       should_show_blocking_page = false;
 148     }
 149
 150     if (should_show_blocking_page)  {
 151       ui_manager->DisplayBlockingPage(resource);
 152       return;
 153     }
 154   }
 155
 156   // Tab is gone or it's being prerendered.
 157   content::BrowserThread::PostTask(
 158       content::BrowserThread::IO,
 159       FROM_HERE,
 160       base::Bind(&SafeBrowsingResourceThrottle::Cancel, throttle));
 161 }
 162
 163 void SafeBrowsingResourceThrottle::Cancel() {
 164   controller()->Cancel();
 165 }
 166
 167 // SafeBrowsingService::UrlCheckCallback implementation, called on the IO
 168 // thread when the user has decided to proceed with the current request, or
 169 // go back.
 170 void SafeBrowsingResourceThrottle::OnBlockingPageComplete(bool proceed) {
 171   CHECK(state_ == STATE_DISPLAYING_BLOCKING_PAGE);
 172   state_ = STATE_NONE;
 173
 174   if (proceed) {
 175     threat_type_ = SB_THREAT_TYPE_SAFE;
 176     ResumeRequest();
 177   } else {
 178     controller()->Cancel();
 179   }
 180 }
 181
 182 bool SafeBrowsingResourceThrottle::CheckUrl(const GURL& url) {
 183   CHECK(state_ == STATE_NONE);
 184   bool succeeded_synchronously = database_manager_->CheckBrowseUrl(url, this);
 185   if (succeeded_synchronously) {
 186     threat_type_ = SB_THREAT_TYPE_SAFE;
 187     ui_manager_->LogPauseDelay(base::TimeDelta());  // No delay.
 188     return true;
 189   }
 190
 191   state_ = STATE_CHECKING_URL;
 192   url_being_checked_ = url;
 193
 194   // Record the start time of the check.
 195   url_check_start_time_ = base::TimeTicks::Now();
 196
 197   // Start a timer to abort the check if it takes too long.
 198   timer_.Start(FROM_HERE,
 199                base::TimeDelta::FromMilliseconds(kCheckUrlTimeoutMs),
 200                this, &SafeBrowsingResourceThrottle::OnCheckUrlTimeout);
 201
 202   return false;
 203 }
 204
 205 void SafeBrowsingResourceThrottle::OnCheckUrlTimeout() {
 206   CHECK(state_ == STATE_CHECKING_URL);
 207   CHECK(defer_state_ != DEFERRED_NONE);
 208
 209   database_manager_->CancelCheck(this);
 210   OnCheckBrowseUrlResult(url_being_checked_, SB_THREAT_TYPE_SAFE);
 211 }
 212
 213 void SafeBrowsingResourceThrottle::ResumeRequest() {
 214   CHECK(state_ == STATE_NONE);
 215   CHECK(defer_state_ != DEFERRED_NONE);
 216
 217   defer_state_ = DEFERRED_NONE;
 218   controller()->Resume();
 219 }