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      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 #ifndef CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
      6 #define CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
      7 
      8 #include <map>
      9 #include <set>
     10 
     11 #include "chrome/common/content_settings.h"
     12 #include "content/public/renderer/render_frame_observer.h"
     13 #include "content/public/renderer/render_frame_observer_tracker.h"
     14 #include "extensions/common/permissions/api_permission.h"
     15 #include "third_party/WebKit/public/web/WebPermissionClient.h"
     16 
     17 class GURL;
     18 
     19 namespace blink {
     20 class WebFrame;
     21 class WebSecurityOrigin;
     22 class WebURL;
     23 }
     24 
     25 namespace extensions {
     26 class Dispatcher;
     27 class Extension;
     28 }
     29 
     30 // Handles blocking content per content settings for each RenderFrame.
     31 class ContentSettingsObserver
     32     : public content::RenderFrameObserver,
     33       public content::RenderFrameObserverTracker<ContentSettingsObserver>,
     34       public blink::WebPermissionClient {
     35  public:
     36   ContentSettingsObserver(content::RenderFrame* render_frame,
     37                           extensions::Dispatcher* extension_dispatcher);
     38   virtual ~ContentSettingsObserver();
     39 
     40   // Sets the content setting rules which back |AllowImage()|, |AllowScript()|,
     41   // and |AllowScriptFromSource()|. |content_setting_rules| must outlive this
     42   // |ContentSettingsObserver|.
     43   void SetContentSettingRules(
     44       const RendererContentSettingRules* content_setting_rules);
     45 
     46   bool IsPluginTemporarilyAllowed(const std::string& identifier);
     47 
     48   // Sends an IPC notification that the specified content type was blocked.
     49   void DidBlockContentType(ContentSettingsType settings_type);
     50 
     51   // blink::WebPermissionClient implementation.
     52   virtual bool allowDatabase(const blink::WebString& name,
     53                              const blink::WebString& display_name,
     54                              unsigned long estimated_size) OVERRIDE;
     55   virtual void requestFileSystemAccessAsync(
     56       const blink::WebPermissionCallbacks& callbacks) OVERRIDE;
     57   virtual bool allowImage(bool enabled_per_settings,
     58                           const blink::WebURL& image_url) OVERRIDE;
     59   virtual bool allowIndexedDB(const blink::WebString& name,
     60                               const blink::WebSecurityOrigin& origin) OVERRIDE;
     61   virtual bool allowPlugins(bool enabled_per_settings) OVERRIDE;
     62   virtual bool allowScript(bool enabled_per_settings) OVERRIDE;
     63   virtual bool allowScriptFromSource(bool enabled_per_settings,
     64                                      const blink::WebURL& script_url) OVERRIDE;
     65   virtual bool allowStorage(bool local) OVERRIDE;
     66   virtual bool allowReadFromClipboard(bool default_value) OVERRIDE;
     67   virtual bool allowWriteToClipboard(bool default_value) OVERRIDE;
     68   virtual bool allowWebComponents(bool default_value) OVERRIDE;
     69   virtual bool allowMutationEvents(bool default_value) OVERRIDE;
     70   virtual bool allowPushState() OVERRIDE;
     71   virtual void didNotAllowPlugins() OVERRIDE;
     72   virtual void didNotAllowScript() OVERRIDE;
     73   virtual bool allowDisplayingInsecureContent(
     74       bool allowed_per_settings,
     75       const blink::WebSecurityOrigin& context,
     76       const blink::WebURL& url) OVERRIDE;
     77   virtual bool allowRunningInsecureContent(
     78       bool allowed_per_settings,
     79       const blink::WebSecurityOrigin& context,
     80       const blink::WebURL& url) OVERRIDE;
     81 
     82   // This is used for cases when the NPAPI plugins malfunction if used.
     83   bool AreNPAPIPluginsBlocked() const;
     84 
     85  private:
     86   FRIEND_TEST_ALL_PREFIXES(ContentSettingsObserverTest, WhitelistedSchemes);
     87   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest,
     88                            ContentSettingsInterstitialPages);
     89   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest, PluginsTemporarilyAllowed);
     90 
     91   // RenderFrameObserver implementation.
     92   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     93   virtual void DidCommitProvisionalLoad(bool is_new_navigation) OVERRIDE;
     94 
     95   // Message handlers.
     96   void OnLoadBlockedPlugins(const std::string& identifier);
     97   void OnSetAsInterstitial();
     98   void OnNPAPINotSupported();
     99   void OnSetAllowDisplayingInsecureContent(bool allow);
    100   void OnSetAllowRunningInsecureContent(bool allow);
    101   void OnReloadFrame();
    102   void OnRequestFileSystemAccessAsyncResponse(int request_id, bool allowed);
    103 
    104   // Resets the |content_blocked_| array.
    105   void ClearBlockedContentSettings();
    106 
    107   // If |origin| corresponds to an installed extension, returns that extension.
    108   // Otherwise returns NULL.
    109   const extensions::Extension* GetExtension(
    110       const blink::WebSecurityOrigin& origin) const;
    111 
    112   // Helpers.
    113   // True if |frame| contains content that is white-listed for content settings.
    114   static bool IsWhitelistedForContentSettings(blink::WebFrame* frame);
    115   static bool IsWhitelistedForContentSettings(
    116       const blink::WebSecurityOrigin& origin,
    117       const GURL& document_url);
    118 
    119   // Owned by ChromeContentRendererClient and outlive us.
    120   extensions::Dispatcher* extension_dispatcher_;
    121 
    122   // Insecure content may be permitted for the duration of this render view.
    123   bool allow_displaying_insecure_content_;
    124   bool allow_running_insecure_content_;
    125 
    126   // A pointer to content setting rules stored by the renderer. Normally, the
    127   // |RendererContentSettingRules| object is owned by
    128   // |ChromeRenderProcessObserver|. In the tests it is owned by the caller of
    129   // |SetContentSettingRules|.
    130   const RendererContentSettingRules* content_setting_rules_;
    131 
    132   // Stores if images, scripts, and plugins have actually been blocked.
    133   bool content_blocked_[CONTENT_SETTINGS_NUM_TYPES];
    134 
    135   // Caches the result of AllowStorage.
    136   typedef std::pair<GURL, bool> StoragePermissionsKey;
    137   std::map<StoragePermissionsKey, bool> cached_storage_permissions_;
    138 
    139   // Caches the result of |AllowScript|.
    140   std::map<blink::WebFrame*, bool> cached_script_permissions_;
    141 
    142   std::set<std::string> temporarily_allowed_plugins_;
    143   bool is_interstitial_page_;
    144   bool npapi_plugins_blocked_;
    145 
    146   int current_request_id_;
    147   typedef std::map<int, blink::WebPermissionCallbacks> PermissionRequestMap;
    148   PermissionRequestMap permission_requests_;
    149 
    150   DISALLOW_COPY_AND_ASSIGN(ContentSettingsObserver);
    151 };
    152 
    153 #endif  // CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
    154