Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Interop / BrowserInteropHelper.cs / 1305600 / BrowserInteropHelper.cs
//----------------------------------------------------------------------------
//
// File: BrowserInteropHelper.cs
//
// Description: Implements Avalon BrowserInteropHelper class, which helps
// interop with the browser
//
// Created: 08/02/05
//
// Copyright (C) by Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Threading;
using System.Security;
using System.Security.Permissions;
using System.Diagnostics;
using MS.Internal;
using MS.Win32;
using System.Windows.Input;
using MS.Internal.AppModel;
using MS.Internal.Interop;
using System.Threading;
using SafeSecurityHelper=MS.Internal.PresentationFramework.SafeSecurityHelper;
namespace System.Windows.Interop
{
///
/// Implements Avalon BrowserInteropHelper, which helps interop with the browser
///
public static class BrowserInteropHelper
{
///
/// Critical because it sets critical data.
/// Safe because it is the static ctor, and the data doesn't go anywhere.
///
[SecurityCritical, SecurityTreatAsSafe]
static BrowserInteropHelper()
{
SetBrowserHosted(false);
IsInitialViewerNavigation = true;
}
///
/// Returns the IOleClientSite interface
///
///
/// Callers must have UnmanagedCode permission to call this API.
///
///
/// Critical: Exposes a COM interface pointer to the IOleClientSite where the app is hosted
/// PublicOK: It is public, but there is a demand
///
public static object ClientSite
{
[SecurityCritical]
get
{
SecurityHelper.DemandUnmanagedCode();
object oleClientSite = null;
if (IsBrowserHosted)
{
Application.Current.BrowserCallbackServices.GetOleClientSite(out oleClientSite);
}
return oleClientSite;
}
}
///
/// Critical: Calls a COM interface method.
/// Calls the constructor of DynamicScriptObject.
/// Calls InitializeHostHtmlDocumentServiceProvider.
/// Safe: The browser's object model is safe for scripting.
/// The implementation of IHostBrowser.GetHostScriptObject() is responsible to block cross-domain access.
///
public static dynamic HostScript
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
// Allows to disable script interop through the registry in partial trust code.
EnsureScriptInteropAllowed();
// IE's marshaling proxy for the HTMLWindow object doesn't work in MTA.
Verify.IsApartmentState(ApartmentState.STA);
IHostBrowser2 hb2 = HostBrowser as IHostBrowser2;
if (hb2 == null)
return null; // One possibility is we are running under NPWPF v3.5.
try
{
var hostScriptObject = (UnsafeNativeMethods.IDispatch)hb2.HostScriptObject;
if (hostScriptObject == null)
return null;
var scriptObject = new DynamicScriptObject(hostScriptObject);
InitializeHostHtmlDocumentServiceProvider(scriptObject);
return scriptObject;
}
catch (UnauthorizedAccessException)
{
return null;
}
}
}
///
/// Returns true if the app is a browser hosted app.
///
///
/// Note that HostingFlags may not be set at the time this property is queried first.
/// That's why they are still separate. Also, this one is public.
///
public static bool IsBrowserHosted
{
get
{
return _isBrowserHosted.Value;
}
}
///
/// This is critical because setting the BrowserHosted status is a critical resource.
///
///
/// HostingFlags is set after this property.
///
[SecurityCritical]
internal static void SetBrowserHosted(bool value)
{
_isBrowserHosted.Value = value;
}
///
/// Critical: These flags are a critical resource because they are used in security decisions.
///
internal static HostingFlags HostingFlags
{
get { return _hostingFlags.Value; }
[SecurityCritical]
set { _hostingFlags.Value = value; }
}
///
/// Returns the Uri used to launch the application.
///
public static Uri Source
{
get
{
return SiteOfOriginContainer.BrowserSource;
}
}
///
/// Returns true if we are running the XAML viewer pseudo-application (what used to be XamlViewer.xbap).
/// This explicitly does not cover the case of XPS documents (MimeType.Document).
///
internal static bool IsViewer
{
get
{
Application app = Application.Current;
return app != null && app.MimeType == MimeType.Markup;
}
}
///
/// Returns true if avalon it top level.
/// Also returns true if not browser-hosted.
///
///
/// Critical: setting this information is a critical resource.
///
internal static bool IsAvalonTopLevel
{
get
{
if (!IsBrowserHosted)
return true;
return (HostingFlags & HostingFlags.hfHostedInFrame) == 0;
}
}
///
/// Returns true if the host browser is IE or the WebOC hosted in a standalone application.
/// Also returns false if not browser-hosted.
///
internal static bool IsHostedInIEorWebOC
{
get
{
return (HostingFlags & HostingFlags.hfHostedInIEorWebOC) != 0;
}
}
///
/// Returns true if we are in viewer mode AND this is the first time that a viewer has been navigated.
/// Including IsViewer is defense-in-depth in case somebody forgets to check IsViewer. There are other
/// reasons why both IsViewer and IsViewerNavigation are necessary, however.
///
///
/// Critical: setting this information is a critical resource.
///
internal static bool IsInitialViewerNavigation
{
get
{
return IsViewer && _isInitialViewerNavigation.Value;
}
[SecurityCritical]
set
{
_isInitialViewerNavigation.Value = value;
}
}
internal static IHostBrowser HostBrowser;
///
/// Critical: Calls Marshal.ReleaseComObject().
/// Drops the security critical service provider stored in _hostHtmlDocumentProvider.
///
[SecurityCritical]
internal static void ReleaseBrowserInterfaces()
{
if (HostBrowser != null)
{
Marshal.ReleaseComObject(HostBrowser);
HostBrowser = null;
}
if (_hostHtmlDocumentServiceProvider.Value != null)
{
Marshal.ReleaseComObject(_hostHtmlDocumentServiceProvider.Value);
_hostHtmlDocumentServiceProvider.Value = null;
}
}
///
/// Retrieves the IServiceProvider object for the browser we're hosted in.
/// This is used for IDispatchEx operations in the script interop feature.
///
internal static UnsafeNativeMethods.IServiceProvider HostHtmlDocumentServiceProvider
{
get
{
// HostHtmlDocumentServiceProvider is used by DynamicScriptObject for IDispatchEx
// operations in case of IE. During initialization we get the document node from
// the DOM to obtain the required service provider. During this short timeframe
// it's valid to have a null-value returned here. In all other cases, we make sure
// not to run with a null service provider for sake of security.
// See InitializeHostHtmlDocumentServiceProvider as well.
/* */
Invariant.Assert(!(_initializedHostScript.Value && _hostHtmlDocumentServiceProvider.Value == null));
return _hostHtmlDocumentServiceProvider.Value;
}
}
///
/// Critical: Sets the critical _hostHtmlDocumentServiceProvider field, which is used during script
/// interop to let Internet Explorer make security decisions with regards to zones. By
/// passing in another service provider it may be possible to interfere with this logic.
///
[SecurityCritical]
private static void InitializeHostHtmlDocumentServiceProvider(DynamicScriptObject scriptObject)
{
// The service provider is used for Internet Explorer IDispatchEx use.
if ( IsHostedInIEorWebOC
&& scriptObject.ScriptObject is UnsafeNativeMethods.IHTMLWindow4
&& _hostHtmlDocumentServiceProvider.Value == null)
{
// We use the IDispatch infrastructure to gain access to the document DOM node where
// the IServiceProvider lives that was recommended to us by IE people. Notice during
// this call the HostHtmlDocumentServiceProvider property here is still null, so this
// first request is made (and succeeds properly) without the service provider in place.
object document;
bool foundDoc = scriptObject.TryFindMemberAndInvokeNonWrapped("document",
NativeMethods.DISPATCH_PROPERTYGET,
true /* cache DISPID, why not? */,
null, /* arguments */
out document);
// The fact the host script is required to be a IHTMLWindow4 here ensures there is
// document property and because we're dealing with IE, we know it has a service
// provider on it.
Invariant.Assert(foundDoc);
_hostHtmlDocumentServiceProvider.Value = (UnsafeNativeMethods.IServiceProvider)document;
// See HostHtmlDocumentServiceProvider property get accessor for more information on the use of
// this field to ensure we got a valid service provider.
_initializedHostScript.Value = true;
}
}
///
/// Critical: this calls ForwardTranslateAccelerator, which is SUC'ed.
///
[SecurityCritical]
private static void HostFilterInput(ref MSG msg, ref bool handled)
{
WindowMessage message = (WindowMessage)msg.message;
// The host gets to see input, keyboard and mouse messages.
if (message == WindowMessage.WM_INPUT ||
(message >= WindowMessage.WM_KEYFIRST && message <= WindowMessage.WM_IME_KEYLAST) ||
(message >= WindowMessage.WM_MOUSEFIRST && message <= WindowMessage.WM_MOUSELAST))
{
if (MS.Win32.NativeMethods.S_OK == ForwardTranslateAccelerator(ref msg, false))
{
handled = true;
}
}
}
/// This hook gets a "last chance" to handle a key. Such applicaton-unhandled
/// keys are forwarded to the browser frame.
///
///
/// Critical: this calls ForwardTranslateAccelerator, which is SUC'ed.
///
[SecurityCritical]
internal static IntPtr PostFilterInput(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (!handled)
{
if ((WindowMessage)msg >= WindowMessage.WM_KEYFIRST && (WindowMessage)msg <= WindowMessage.WM_IME_KEYLAST)
{
MSG m = new MSG(hwnd, msg, wParam, lParam, SafeNativeMethods.GetMessageTime(), 0, 0);
if (MS.Win32.NativeMethods.S_OK == ForwardTranslateAccelerator(ref m, true))
{
handled = true;
}
}
}
return IntPtr.Zero;
}
///
/// Critical: this attaches an event to ThreadFilterMessage, which requires an assert
/// Safe: doesn't expose anything, just does some internal plumbing stuff
///
[SecurityCritical, SecurityTreatAsSafe]
internal static void InitializeHostFilterInput()
{
(new UIPermission(PermissionState.Unrestricted)).Assert(); // Blessed assert
try
{
ComponentDispatcher.ThreadFilterMessage +=
new ThreadMessageEventHandler(HostFilterInput);
}
finally
{
UIPermission.RevertAssert();
}
}
///
/// Critical: setting critical _isScriptInteropDisabled flag.
/// Safe: _isScriptInteropDisabled is set from a trusted source.
///
[SecurityCritical, SecurityTreatAsSafe]
private static void EnsureScriptInteropAllowed()
{
if (_isScriptInteropDisabled.Value == null)
{
_isScriptInteropDisabled.Value = SafeSecurityHelper.IsFeatureDisabled(SafeSecurityHelper.KeyToRead.ScriptInteropDisable);
}
// Similar approach as with WebBrowser.cs.
if (_isScriptInteropDisabled.Value.Value)
{
// Feature is disabled - demand unrestricted WebBrowserPermission to hand out the script object.
MS.Internal.PresentationFramework.SecurityHelper.DemandWebBrowserPermission();
}
else
{
// Feature is enabled - demand Safe level to hand out the script object, granted in Partial Trust by default.
(new WebBrowserPermission(WebBrowserPermissionLevel.Safe)).Demand();
}
}
private static SecurityCriticalDataForSet _isBrowserHosted;
private static SecurityCriticalDataForSet _hostingFlags;
private static SecurityCriticalDataForSet _isInitialViewerNavigation;
private static SecurityCriticalDataForSet _isScriptInteropDisabled;
private static SecurityCriticalDataForSet _hostHtmlDocumentServiceProvider;
private static SecurityCriticalDataForSet _initializedHostScript;
///
/// Critical - call is SUC'ed
///
[SecurityCritical, SuppressUnmanagedCodeSecurity]
[DllImport(ExternDll.PresentationHostDll, EntryPoint="ForwardTranslateAccelerator")]
private static extern int ForwardTranslateAccelerator(ref MSG pMsg, bool appUnhandled);
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
// File: BrowserInteropHelper.cs
//
// Description: Implements Avalon BrowserInteropHelper class, which helps
// interop with the browser
//
// Created: 08/02/05
//
// Copyright (C) by Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Threading;
using System.Security;
using System.Security.Permissions;
using System.Diagnostics;
using MS.Internal;
using MS.Win32;
using System.Windows.Input;
using MS.Internal.AppModel;
using MS.Internal.Interop;
using System.Threading;
using SafeSecurityHelper=MS.Internal.PresentationFramework.SafeSecurityHelper;
namespace System.Windows.Interop
{
///
/// Implements Avalon BrowserInteropHelper, which helps interop with the browser
///
public static class BrowserInteropHelper
{
///
/// Critical because it sets critical data.
/// Safe because it is the static ctor, and the data doesn't go anywhere.
///
[SecurityCritical, SecurityTreatAsSafe]
static BrowserInteropHelper()
{
SetBrowserHosted(false);
IsInitialViewerNavigation = true;
}
///
/// Returns the IOleClientSite interface
///
///
/// Callers must have UnmanagedCode permission to call this API.
///
///
/// Critical: Exposes a COM interface pointer to the IOleClientSite where the app is hosted
/// PublicOK: It is public, but there is a demand
///
public static object ClientSite
{
[SecurityCritical]
get
{
SecurityHelper.DemandUnmanagedCode();
object oleClientSite = null;
if (IsBrowserHosted)
{
Application.Current.BrowserCallbackServices.GetOleClientSite(out oleClientSite);
}
return oleClientSite;
}
}
///
/// Critical: Calls a COM interface method.
/// Calls the constructor of DynamicScriptObject.
/// Calls InitializeHostHtmlDocumentServiceProvider.
/// Safe: The browser's object model is safe for scripting.
/// The implementation of IHostBrowser.GetHostScriptObject() is responsible to block cross-domain access.
///
public static dynamic HostScript
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
// Allows to disable script interop through the registry in partial trust code.
EnsureScriptInteropAllowed();
// IE's marshaling proxy for the HTMLWindow object doesn't work in MTA.
Verify.IsApartmentState(ApartmentState.STA);
IHostBrowser2 hb2 = HostBrowser as IHostBrowser2;
if (hb2 == null)
return null; // One possibility is we are running under NPWPF v3.5.
try
{
var hostScriptObject = (UnsafeNativeMethods.IDispatch)hb2.HostScriptObject;
if (hostScriptObject == null)
return null;
var scriptObject = new DynamicScriptObject(hostScriptObject);
InitializeHostHtmlDocumentServiceProvider(scriptObject);
return scriptObject;
}
catch (UnauthorizedAccessException)
{
return null;
}
}
}
///
/// Returns true if the app is a browser hosted app.
///
///
/// Note that HostingFlags may not be set at the time this property is queried first.
/// That's why they are still separate. Also, this one is public.
///
public static bool IsBrowserHosted
{
get
{
return _isBrowserHosted.Value;
}
}
///
/// This is critical because setting the BrowserHosted status is a critical resource.
///
///
/// HostingFlags is set after this property.
///
[SecurityCritical]
internal static void SetBrowserHosted(bool value)
{
_isBrowserHosted.Value = value;
}
///
/// Critical: These flags are a critical resource because they are used in security decisions.
///
internal static HostingFlags HostingFlags
{
get { return _hostingFlags.Value; }
[SecurityCritical]
set { _hostingFlags.Value = value; }
}
///
/// Returns the Uri used to launch the application.
///
public static Uri Source
{
get
{
return SiteOfOriginContainer.BrowserSource;
}
}
///
/// Returns true if we are running the XAML viewer pseudo-application (what used to be XamlViewer.xbap).
/// This explicitly does not cover the case of XPS documents (MimeType.Document).
///
internal static bool IsViewer
{
get
{
Application app = Application.Current;
return app != null && app.MimeType == MimeType.Markup;
}
}
///
/// Returns true if avalon it top level.
/// Also returns true if not browser-hosted.
///
///
/// Critical: setting this information is a critical resource.
///
internal static bool IsAvalonTopLevel
{
get
{
if (!IsBrowserHosted)
return true;
return (HostingFlags & HostingFlags.hfHostedInFrame) == 0;
}
}
///
/// Returns true if the host browser is IE or the WebOC hosted in a standalone application.
/// Also returns false if not browser-hosted.
///
internal static bool IsHostedInIEorWebOC
{
get
{
return (HostingFlags & HostingFlags.hfHostedInIEorWebOC) != 0;
}
}
///
/// Returns true if we are in viewer mode AND this is the first time that a viewer has been navigated.
/// Including IsViewer is defense-in-depth in case somebody forgets to check IsViewer. There are other
/// reasons why both IsViewer and IsViewerNavigation are necessary, however.
///
///
/// Critical: setting this information is a critical resource.
///
internal static bool IsInitialViewerNavigation
{
get
{
return IsViewer && _isInitialViewerNavigation.Value;
}
[SecurityCritical]
set
{
_isInitialViewerNavigation.Value = value;
}
}
internal static IHostBrowser HostBrowser;
///
/// Critical: Calls Marshal.ReleaseComObject().
/// Drops the security critical service provider stored in _hostHtmlDocumentProvider.
///
[SecurityCritical]
internal static void ReleaseBrowserInterfaces()
{
if (HostBrowser != null)
{
Marshal.ReleaseComObject(HostBrowser);
HostBrowser = null;
}
if (_hostHtmlDocumentServiceProvider.Value != null)
{
Marshal.ReleaseComObject(_hostHtmlDocumentServiceProvider.Value);
_hostHtmlDocumentServiceProvider.Value = null;
}
}
///
/// Retrieves the IServiceProvider object for the browser we're hosted in.
/// This is used for IDispatchEx operations in the script interop feature.
///
internal static UnsafeNativeMethods.IServiceProvider HostHtmlDocumentServiceProvider
{
get
{
// HostHtmlDocumentServiceProvider is used by DynamicScriptObject for IDispatchEx
// operations in case of IE. During initialization we get the document node from
// the DOM to obtain the required service provider. During this short timeframe
// it's valid to have a null-value returned here. In all other cases, we make sure
// not to run with a null service provider for sake of security.
// See InitializeHostHtmlDocumentServiceProvider as well.
/* */
Invariant.Assert(!(_initializedHostScript.Value && _hostHtmlDocumentServiceProvider.Value == null));
return _hostHtmlDocumentServiceProvider.Value;
}
}
///
/// Critical: Sets the critical _hostHtmlDocumentServiceProvider field, which is used during script
/// interop to let Internet Explorer make security decisions with regards to zones. By
/// passing in another service provider it may be possible to interfere with this logic.
///
[SecurityCritical]
private static void InitializeHostHtmlDocumentServiceProvider(DynamicScriptObject scriptObject)
{
// The service provider is used for Internet Explorer IDispatchEx use.
if ( IsHostedInIEorWebOC
&& scriptObject.ScriptObject is UnsafeNativeMethods.IHTMLWindow4
&& _hostHtmlDocumentServiceProvider.Value == null)
{
// We use the IDispatch infrastructure to gain access to the document DOM node where
// the IServiceProvider lives that was recommended to us by IE people. Notice during
// this call the HostHtmlDocumentServiceProvider property here is still null, so this
// first request is made (and succeeds properly) without the service provider in place.
object document;
bool foundDoc = scriptObject.TryFindMemberAndInvokeNonWrapped("document",
NativeMethods.DISPATCH_PROPERTYGET,
true /* cache DISPID, why not? */,
null, /* arguments */
out document);
// The fact the host script is required to be a IHTMLWindow4 here ensures there is
// document property and because we're dealing with IE, we know it has a service
// provider on it.
Invariant.Assert(foundDoc);
_hostHtmlDocumentServiceProvider.Value = (UnsafeNativeMethods.IServiceProvider)document;
// See HostHtmlDocumentServiceProvider property get accessor for more information on the use of
// this field to ensure we got a valid service provider.
_initializedHostScript.Value = true;
}
}
///
/// Critical: this calls ForwardTranslateAccelerator, which is SUC'ed.
///
[SecurityCritical]
private static void HostFilterInput(ref MSG msg, ref bool handled)
{
WindowMessage message = (WindowMessage)msg.message;
// The host gets to see input, keyboard and mouse messages.
if (message == WindowMessage.WM_INPUT ||
(message >= WindowMessage.WM_KEYFIRST && message <= WindowMessage.WM_IME_KEYLAST) ||
(message >= WindowMessage.WM_MOUSEFIRST && message <= WindowMessage.WM_MOUSELAST))
{
if (MS.Win32.NativeMethods.S_OK == ForwardTranslateAccelerator(ref msg, false))
{
handled = true;
}
}
}
/// This hook gets a "last chance" to handle a key. Such applicaton-unhandled
/// keys are forwarded to the browser frame.
///
///
/// Critical: this calls ForwardTranslateAccelerator, which is SUC'ed.
///
[SecurityCritical]
internal static IntPtr PostFilterInput(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (!handled)
{
if ((WindowMessage)msg >= WindowMessage.WM_KEYFIRST && (WindowMessage)msg <= WindowMessage.WM_IME_KEYLAST)
{
MSG m = new MSG(hwnd, msg, wParam, lParam, SafeNativeMethods.GetMessageTime(), 0, 0);
if (MS.Win32.NativeMethods.S_OK == ForwardTranslateAccelerator(ref m, true))
{
handled = true;
}
}
}
return IntPtr.Zero;
}
///
/// Critical: this attaches an event to ThreadFilterMessage, which requires an assert
/// Safe: doesn't expose anything, just does some internal plumbing stuff
///
[SecurityCritical, SecurityTreatAsSafe]
internal static void InitializeHostFilterInput()
{
(new UIPermission(PermissionState.Unrestricted)).Assert(); // Blessed assert
try
{
ComponentDispatcher.ThreadFilterMessage +=
new ThreadMessageEventHandler(HostFilterInput);
}
finally
{
UIPermission.RevertAssert();
}
}
///
/// Critical: setting critical _isScriptInteropDisabled flag.
/// Safe: _isScriptInteropDisabled is set from a trusted source.
///
[SecurityCritical, SecurityTreatAsSafe]
private static void EnsureScriptInteropAllowed()
{
if (_isScriptInteropDisabled.Value == null)
{
_isScriptInteropDisabled.Value = SafeSecurityHelper.IsFeatureDisabled(SafeSecurityHelper.KeyToRead.ScriptInteropDisable);
}
// Similar approach as with WebBrowser.cs.
if (_isScriptInteropDisabled.Value.Value)
{
// Feature is disabled - demand unrestricted WebBrowserPermission to hand out the script object.
MS.Internal.PresentationFramework.SecurityHelper.DemandWebBrowserPermission();
}
else
{
// Feature is enabled - demand Safe level to hand out the script object, granted in Partial Trust by default.
(new WebBrowserPermission(WebBrowserPermissionLevel.Safe)).Demand();
}
}
private static SecurityCriticalDataForSet _isBrowserHosted;
private static SecurityCriticalDataForSet _hostingFlags;
private static SecurityCriticalDataForSet _isInitialViewerNavigation;
private static SecurityCriticalDataForSet _isScriptInteropDisabled;
private static SecurityCriticalDataForSet _hostHtmlDocumentServiceProvider;
private static SecurityCriticalDataForSet _initializedHostScript;
///
/// Critical - call is SUC'ed
///
[SecurityCritical, SuppressUnmanagedCodeSecurity]
[DllImport(ExternDll.PresentationHostDll, EntryPoint="ForwardTranslateAccelerator")]
private static extern int ForwardTranslateAccelerator(ref MSG pMsg, bool appUnhandled);
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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