chrome/renderer/safe_browsing/malware_dom_details.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/renderer/safe_browsing/malware_dom_details.h"
   6
   7 #include "base/compiler_specific.h"
   8 #include "chrome/common/chrome_constants.h"
   9 #include "chrome/common/safe_browsing/safebrowsing_messages.h"
  10 #include "content/public/renderer/render_view.h"
  11 #include "third_party/WebKit/public/platform/WebString.h"
  12 #include "third_party/WebKit/public/web/WebDocument.h"
  13 #include "third_party/WebKit/public/web/WebElement.h"
  14 #include "third_party/WebKit/public/web/WebElementCollection.h"
  15 #include "third_party/WebKit/public/web/WebFrame.h"
  16 #include "third_party/WebKit/public/web/WebView.h"
  17
  18 namespace safe_browsing {
  19
  20 // An upper limit on the number of nodes we collect.
  21 uint32 MalwareDOMDetails::kMaxNodes = 500;
  22
  23 // static
  24 MalwareDOMDetails* MalwareDOMDetails::Create(content::RenderView* render_view) {
  25   // Private constructor and public static Create() method to facilitate
  26   // stubbing out this class for binary-size reduction purposes.
  27   return new MalwareDOMDetails(render_view);
  28 }
  29
  30 MalwareDOMDetails::MalwareDOMDetails(content::RenderView* render_view)
  31     : content::RenderViewObserver(render_view) {
  32 }
  33
  34 MalwareDOMDetails::~MalwareDOMDetails() {
  35 }
  36
  37 bool MalwareDOMDetails::OnMessageReceived(const IPC::Message& message) {
  38   bool handled = true;
  39   IPC_BEGIN_MESSAGE_MAP(MalwareDOMDetails, message)
  40     IPC_MESSAGE_HANDLER(SafeBrowsingMsg_GetMalwareDOMDetails,
  41                         OnGetMalwareDOMDetails)
  42     IPC_MESSAGE_UNHANDLED(handled = false)
  43   IPC_END_MESSAGE_MAP()
  44   return handled;
  45 }
  46
  47 void MalwareDOMDetails::OnGetMalwareDOMDetails() {
  48   std::vector<SafeBrowsingHostMsg_MalwareDOMDetails_Node> resources;
  49   ExtractResources(&resources);
  50   // Notify the browser.
  51   render_view()->Send(new SafeBrowsingHostMsg_MalwareDOMDetails(
  52       render_view()->GetRoutingID(), resources));
  53 }
  54
  55 void MalwareDOMDetails::ExtractResources(
  56     std::vector<SafeBrowsingHostMsg_MalwareDOMDetails_Node>* resources) {
  57   blink::WebView* web_view = render_view()->GetWebView();
  58   if (!web_view) {
  59     NOTREACHED();
  60     return;
  61   }
  62   blink::WebFrame* frame = web_view->mainFrame();
  63   for (; frame; frame = frame->traverseNext(false /* don't wrap */)) {
  64     DCHECK(frame);
  65     SafeBrowsingHostMsg_MalwareDOMDetails_Node details_node;
  66     blink::WebDocument document = frame->document();
  67     details_node.url = GURL(document.url());
  68     if (document.isNull()) {
  69       // Nothing in this frame, move on to the next one.
  70       resources->push_back(details_node);
  71       continue;
  72     }
  73
  74     blink::WebElementCollection elements = document.all();
  75     blink::WebElement element = elements.firstItem();
  76     for (; !element.isNull(); element = elements.nextItem()) {
  77       if (element.hasTagName("iframe") || element.hasTagName("frame") ||
  78           element.hasTagName("embed") || element.hasTagName("script")) {
  79         HandleElement(element, &details_node, resources);
  80         if (resources->size() >= kMaxNodes) {
  81           // We have reached kMaxNodes, exit early.
  82           resources->push_back(details_node);
  83           return;
  84         }
  85       }
  86     }
  87
  88     resources->push_back(details_node);
  89   }
  90 }
  91
  92 void MalwareDOMDetails::HandleElement(
  93     const blink::WebElement& element,
  94     SafeBrowsingHostMsg_MalwareDOMDetails_Node* parent_node,
  95     std::vector<SafeBrowsingHostMsg_MalwareDOMDetails_Node>* resources) {
  96   if (!element.hasAttribute("src")) {
  97     return;
  98   }
  99
 100   // Retrieve the link and resolve the link in case it's relative.
 101   blink::WebURL full_url = element.document().completeURL(
 102       element.getAttribute("src"));
 103
 104   const GURL& child_url = GURL(full_url);
 105
 106   // Add to the parent node.
 107   parent_node->children.push_back(child_url);
 108
 109   // Create the child node.
 110   SafeBrowsingHostMsg_MalwareDOMDetails_Node child_node;
 111   child_node.url = child_url;
 112   child_node.tag_name = element.tagName().utf8();
 113   child_node.parent = parent_node->url;
 114   resources->push_back(child_node);
 115 }
 116
 117 }  // namespace safe_browsing