Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / MS / Internal / Controls / webbrowsersite.cs / 1 / webbrowsersite.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
//
// Description:
// WebBrowserSite is a sub-class of ActiveXSite.
// Used to implement IDocHostUIHandler.
//
// Copied from WebBrowser.cs in winforms
//
// History
// 06/16/05 - marka - Created
// 04/24/08 - ChangoV - Implemented hosting the WebOC in the browser process for IE 7+ Protected Mode.
//
//-----------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using MS.Win32;
using System.Security ;
using MS.Internal.PresentationFramework;
using System.Windows.Controls;
using System.Windows.Interop;
using System.Windows.Input;
using System.Windows.Threading;
using System.Threading;
using IComDataObject = System.Runtime.InteropServices.ComTypes.IDataObject;
namespace MS.Internal.Controls
{
//
// WebBrowserSite class:
//
///
///
/// Provides a default WebBrowserSite implementation for use in the CreateWebBrowserSite
/// method in the WebBrowser class.
///
///
/// WebOCHostedInBrowserProcess - defense in depth:
/// These interface implementations are exposed across a security boundary. We must not allow a
/// compromised low-integrity-level browser process to gain elevation of privilege via our process or
/// tamper with its state. (Attacking the WebOC via this interface is not interesting, because the WebOC
/// is directly accessible in the browser process.) Each interface implementation method must be
/// carefully reviewed to ensure that it cannot be abused by disclosing protected resources or by passing
/// malicious data to it.
///
///
/// THREADING ISSUE: When WebBrowser.IsWebOCHostedInBrowserProcess, calls on the interfaces implemented here
/// (and on ActiveXSite) arrive on RPC worker threads. This is because CLR objects don't like to stick to
/// STA threads. Fortunately, most of the current implementation methods are okay to be called on any thread.
/// And if not, switching to the WebBrowser object's thread via the Dispatcher is usually possible & safe.
/// In a few scenarios, when we need to call a WebOC method from one of these callback interfaces, we get
/// RPC_E_CANTCALLOUT_ININPUTSYNCCALL, which happens because the CLR actually tries to switch to the right
/// thread to make the COM call, but that thread is already blocked on an outgoing call (to the WebOC).
/// One example is IOleInPlaceSite.OnInPlaceActivate().
/// These failures are silent and safely ignorable for now. If this threading issue becomes more troubling,
/// a solution like ActiveXHelper.CreateIDispatchSTAForwarder() is possible.
///
internal class WebBrowserSite : ActiveXSite,
UnsafeNativeMethods.IDocHostUIHandler,
UnsafeNativeMethods.IOleControlSite // partial override
{
///
///
/// WebBrowser implementation of ActiveXSite. Used to override GetHostInfo.
/// and "turn on" our redirect notifications.
///
///
/// Critical - calls base class ctor which is critical.
///
[ SecurityCritical ]
internal WebBrowserSite(WebBrowser host) : base(host)
{
}
#region IDocHostUIHandler Implementation
int UnsafeNativeMethods.IDocHostUIHandler.ShowContextMenu(int dwID, NativeMethods.POINT pt, object pcmdtReserved, object pdispReserved)
{
//
// Returning S_FALSE will allow the native control to do default processing,
// i.e., execute the shortcut key. Returning S_OK will cancel the context menu
//
return NativeMethods.S_FALSE;
}
///
/// Critical - calls critical code.
/// If you change this method - you could affect mitigations.
/// **Needs to be critical.**
/// TreatAsSafe - information returned from this method is innocous.
/// lists the set of browser features/options we've enabled.
///
[ SecurityCritical, SecurityTreatAsSafe ]
int UnsafeNativeMethods.IDocHostUIHandler.GetHostInfo(NativeMethods.DOCHOSTUIINFO info)
{
WebBrowser wb = (WebBrowser) Host;
info.dwDoubleClick = (int) NativeMethods.DOCHOSTUIDBLCLICK.DEFAULT;
//
// These are the current flags shdocvw uses. Assumed we want the same.
//
info.dwFlags = (int) ( NativeMethods.DOCHOSTUIFLAG.DISABLE_HELP_MENU |
NativeMethods.DOCHOSTUIFLAG.DISABLE_SCRIPT_INACTIVE |
NativeMethods.DOCHOSTUIFLAG.ENABLE_INPLACE_NAVIGATION |
NativeMethods.DOCHOSTUIFLAG.IME_ENABLE_RECONVERSION |
NativeMethods.DOCHOSTUIFLAG.THEME |
NativeMethods.DOCHOSTUIFLAG.ENABLE_FORMS_AUTOCOMPLETE |
NativeMethods.DOCHOSTUIFLAG.DISABLE_UNTRUSTEDPROTOCOL |
NativeMethods.DOCHOSTUIFLAG.LOCAL_MACHINE_ACCESS_CHECK |
NativeMethods.DOCHOSTUIFLAG.ENABLE_REDIRECT_NOTIFICATION |
NativeMethods.DOCHOSTUIFLAG.NO3DOUTERBORDER);
return NativeMethods.S_OK;
}
int UnsafeNativeMethods.IDocHostUIHandler.EnableModeless(bool fEnable)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.ShowUI(int dwID, UnsafeNativeMethods.IOleInPlaceActiveObject activeObject,
NativeMethods.IOleCommandTarget commandTarget, UnsafeNativeMethods.IOleInPlaceFrame frame,
UnsafeNativeMethods.IOleInPlaceUIWindow doc)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.HideUI()
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.UpdateUI() {
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.OnDocWindowActivate(bool fActivate)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.OnFrameWindowActivate(bool fActivate)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.ResizeBorder(NativeMethods.COMRECT rect, UnsafeNativeMethods.IOleInPlaceUIWindow doc, bool fFrameWindow)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.GetOptionKeyPath(string[] pbstrKey, int dw)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.GetDropTarget(UnsafeNativeMethods.IOleDropTarget pDropTarget, out UnsafeNativeMethods.IOleDropTarget ppDropTarget)
{
//
// Set to null no matter what we return, to prevent the marshaller
// from going crazy if the pointer points to random stuff.
ppDropTarget = null;
return NativeMethods.E_NOTIMPL;
}
///
/// Critical: This code access critical member Host.
/// TreatAsSafe: The object returned is sandboxed in the managed environment.
///
[SecurityCritical, SecurityTreatAsSafe]
int UnsafeNativeMethods.IDocHostUIHandler.GetExternal(out object ppDispatch)
{
WebBrowser wb = (WebBrowser) Host;
ppDispatch = wb.HostingAdaptor.ObjectForScripting;
return NativeMethods.S_OK;
}
///
/// Called by the WebOC whenever its IOleInPlaceActiveObject::TranslateAccelerator() is called.
/// See also the IOleControlSite.TranslateAccelerator() implementation here.
///
int UnsafeNativeMethods.IDocHostUIHandler.TranslateAccelerator(ref System.Windows.Interop.MSG msg, ref Guid group, int nCmdID)
{
//
// Returning S_FALSE will allow the native control to do default processing,
// i.e., execute the shortcut key. Returning S_OK will cancel the shortcut key.
/* WebBrowser wb = (WebBrowser)this.Host;
if (!wb.WebBrowserShortcutsEnabled)
{
int keyCode = (int)msg.wParam | (int)Control.ModifierKeys;
if (msg.message != NativeMethods.WM_CHAR
&& Enum.IsDefined(typeof(Shortcut), (Shortcut)keyCode)) {
return NativeMethods.S_OK;
}
return NativeMethods.S_FALSE;
}
*/
return NativeMethods.S_FALSE;
}
int UnsafeNativeMethods.IDocHostUIHandler.TranslateUrl(int dwTranslate, string strUrlIn, out string pstrUrlOut)
{
//
// Set to null no matter what we return, to prevent the marshaller
// from going crazy if the pointer points to random stuff.
pstrUrlOut = null;
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.FilterDataObject(IComDataObject pDO, out IComDataObject ppDORet)
{
//
// Set to null no matter what we return, to prevent the marshaller
// from going crazy if the pointer points to random stuff.
ppDORet = null;
return NativeMethods.E_NOTIMPL;
}
#endregion
/// See overview of keyboard input handling in WebBrowser.cs.
///
/// Critical: Access the critical Host property.
/// TAS: Host is not exposed.
/// WebOCHostedInBrowserProcess: Potential for input spoofing. Currently we handle only the Tab key,
/// which is safe.
///
[SecurityCritical, SecurityTreatAsSafe]
int UnsafeNativeMethods.IOleControlSite.TranslateAccelerator(ref MSG msg, int grfModifiers)
{
// Handle tabbing out of the WebOC
if (msg.message == NativeMethods.WM_KEYDOWN && (int)msg.wParam == NativeMethods.VK_TAB)
{
FocusNavigationDirection direction =
(grfModifiers & 1/*KEYMOD_SHIFT*/) != 0 ?
FocusNavigationDirection.Previous : FocusNavigationDirection.Next;
// For the WebOCHostedInBrowserProcess case, we need to switch to the right thread.
Host.Dispatcher.Invoke(
DispatcherPriority.Send, new SendOrPostCallback(MoveFocusCallback), direction);
return NativeMethods.S_OK;
}
return NativeMethods.S_FALSE;
}
///
/// Critical: Access the critical Host property.
/// TAS: Host is not exposed.
///
[SecurityCritical, SecurityTreatAsSafe]
private void MoveFocusCallback(object direction)
{
Host.MoveFocus(new TraversalRequest((FocusNavigationDirection)direction));
}
};
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
//
// Description:
// WebBrowserSite is a sub-class of ActiveXSite.
// Used to implement IDocHostUIHandler.
//
// Copied from WebBrowser.cs in winforms
//
// History
// 06/16/05 - marka - Created
// 04/24/08 - ChangoV - Implemented hosting the WebOC in the browser process for IE 7+ Protected Mode.
//
//-----------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using MS.Win32;
using System.Security ;
using MS.Internal.PresentationFramework;
using System.Windows.Controls;
using System.Windows.Interop;
using System.Windows.Input;
using System.Windows.Threading;
using System.Threading;
using IComDataObject = System.Runtime.InteropServices.ComTypes.IDataObject;
namespace MS.Internal.Controls
{
//
// WebBrowserSite class:
//
///
///
/// Provides a default WebBrowserSite implementation for use in the CreateWebBrowserSite
/// method in the WebBrowser class.
///
///
/// WebOCHostedInBrowserProcess - defense in depth:
/// These interface implementations are exposed across a security boundary. We must not allow a
/// compromised low-integrity-level browser process to gain elevation of privilege via our process or
/// tamper with its state. (Attacking the WebOC via this interface is not interesting, because the WebOC
/// is directly accessible in the browser process.) Each interface implementation method must be
/// carefully reviewed to ensure that it cannot be abused by disclosing protected resources or by passing
/// malicious data to it.
///
///
/// THREADING ISSUE: When WebBrowser.IsWebOCHostedInBrowserProcess, calls on the interfaces implemented here
/// (and on ActiveXSite) arrive on RPC worker threads. This is because CLR objects don't like to stick to
/// STA threads. Fortunately, most of the current implementation methods are okay to be called on any thread.
/// And if not, switching to the WebBrowser object's thread via the Dispatcher is usually possible & safe.
/// In a few scenarios, when we need to call a WebOC method from one of these callback interfaces, we get
/// RPC_E_CANTCALLOUT_ININPUTSYNCCALL, which happens because the CLR actually tries to switch to the right
/// thread to make the COM call, but that thread is already blocked on an outgoing call (to the WebOC).
/// One example is IOleInPlaceSite.OnInPlaceActivate().
/// These failures are silent and safely ignorable for now. If this threading issue becomes more troubling,
/// a solution like ActiveXHelper.CreateIDispatchSTAForwarder() is possible.
///
internal class WebBrowserSite : ActiveXSite,
UnsafeNativeMethods.IDocHostUIHandler,
UnsafeNativeMethods.IOleControlSite // partial override
{
///
///
/// WebBrowser implementation of ActiveXSite. Used to override GetHostInfo.
/// and "turn on" our redirect notifications.
///
///
/// Critical - calls base class ctor which is critical.
///
[ SecurityCritical ]
internal WebBrowserSite(WebBrowser host) : base(host)
{
}
#region IDocHostUIHandler Implementation
int UnsafeNativeMethods.IDocHostUIHandler.ShowContextMenu(int dwID, NativeMethods.POINT pt, object pcmdtReserved, object pdispReserved)
{
//
// Returning S_FALSE will allow the native control to do default processing,
// i.e., execute the shortcut key. Returning S_OK will cancel the context menu
//
return NativeMethods.S_FALSE;
}
///
/// Critical - calls critical code.
/// If you change this method - you could affect mitigations.
/// **Needs to be critical.**
/// TreatAsSafe - information returned from this method is innocous.
/// lists the set of browser features/options we've enabled.
///
[ SecurityCritical, SecurityTreatAsSafe ]
int UnsafeNativeMethods.IDocHostUIHandler.GetHostInfo(NativeMethods.DOCHOSTUIINFO info)
{
WebBrowser wb = (WebBrowser) Host;
info.dwDoubleClick = (int) NativeMethods.DOCHOSTUIDBLCLICK.DEFAULT;
//
// These are the current flags shdocvw uses. Assumed we want the same.
//
info.dwFlags = (int) ( NativeMethods.DOCHOSTUIFLAG.DISABLE_HELP_MENU |
NativeMethods.DOCHOSTUIFLAG.DISABLE_SCRIPT_INACTIVE |
NativeMethods.DOCHOSTUIFLAG.ENABLE_INPLACE_NAVIGATION |
NativeMethods.DOCHOSTUIFLAG.IME_ENABLE_RECONVERSION |
NativeMethods.DOCHOSTUIFLAG.THEME |
NativeMethods.DOCHOSTUIFLAG.ENABLE_FORMS_AUTOCOMPLETE |
NativeMethods.DOCHOSTUIFLAG.DISABLE_UNTRUSTEDPROTOCOL |
NativeMethods.DOCHOSTUIFLAG.LOCAL_MACHINE_ACCESS_CHECK |
NativeMethods.DOCHOSTUIFLAG.ENABLE_REDIRECT_NOTIFICATION |
NativeMethods.DOCHOSTUIFLAG.NO3DOUTERBORDER);
return NativeMethods.S_OK;
}
int UnsafeNativeMethods.IDocHostUIHandler.EnableModeless(bool fEnable)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.ShowUI(int dwID, UnsafeNativeMethods.IOleInPlaceActiveObject activeObject,
NativeMethods.IOleCommandTarget commandTarget, UnsafeNativeMethods.IOleInPlaceFrame frame,
UnsafeNativeMethods.IOleInPlaceUIWindow doc)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.HideUI()
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.UpdateUI() {
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.OnDocWindowActivate(bool fActivate)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.OnFrameWindowActivate(bool fActivate)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.ResizeBorder(NativeMethods.COMRECT rect, UnsafeNativeMethods.IOleInPlaceUIWindow doc, bool fFrameWindow)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.GetOptionKeyPath(string[] pbstrKey, int dw)
{
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.GetDropTarget(UnsafeNativeMethods.IOleDropTarget pDropTarget, out UnsafeNativeMethods.IOleDropTarget ppDropTarget)
{
//
// Set to null no matter what we return, to prevent the marshaller
// from going crazy if the pointer points to random stuff.
ppDropTarget = null;
return NativeMethods.E_NOTIMPL;
}
///
/// Critical: This code access critical member Host.
/// TreatAsSafe: The object returned is sandboxed in the managed environment.
///
[SecurityCritical, SecurityTreatAsSafe]
int UnsafeNativeMethods.IDocHostUIHandler.GetExternal(out object ppDispatch)
{
WebBrowser wb = (WebBrowser) Host;
ppDispatch = wb.HostingAdaptor.ObjectForScripting;
return NativeMethods.S_OK;
}
///
/// Called by the WebOC whenever its IOleInPlaceActiveObject::TranslateAccelerator() is called.
/// See also the IOleControlSite.TranslateAccelerator() implementation here.
///
int UnsafeNativeMethods.IDocHostUIHandler.TranslateAccelerator(ref System.Windows.Interop.MSG msg, ref Guid group, int nCmdID)
{
//
// Returning S_FALSE will allow the native control to do default processing,
// i.e., execute the shortcut key. Returning S_OK will cancel the shortcut key.
/* WebBrowser wb = (WebBrowser)this.Host;
if (!wb.WebBrowserShortcutsEnabled)
{
int keyCode = (int)msg.wParam | (int)Control.ModifierKeys;
if (msg.message != NativeMethods.WM_CHAR
&& Enum.IsDefined(typeof(Shortcut), (Shortcut)keyCode)) {
return NativeMethods.S_OK;
}
return NativeMethods.S_FALSE;
}
*/
return NativeMethods.S_FALSE;
}
int UnsafeNativeMethods.IDocHostUIHandler.TranslateUrl(int dwTranslate, string strUrlIn, out string pstrUrlOut)
{
//
// Set to null no matter what we return, to prevent the marshaller
// from going crazy if the pointer points to random stuff.
pstrUrlOut = null;
return NativeMethods.E_NOTIMPL;
}
int UnsafeNativeMethods.IDocHostUIHandler.FilterDataObject(IComDataObject pDO, out IComDataObject ppDORet)
{
//
// Set to null no matter what we return, to prevent the marshaller
// from going crazy if the pointer points to random stuff.
ppDORet = null;
return NativeMethods.E_NOTIMPL;
}
#endregion
/// See overview of keyboard input handling in WebBrowser.cs.
///
/// Critical: Access the critical Host property.
/// TAS: Host is not exposed.
/// WebOCHostedInBrowserProcess: Potential for input spoofing. Currently we handle only the Tab key,
/// which is safe.
///
[SecurityCritical, SecurityTreatAsSafe]
int UnsafeNativeMethods.IOleControlSite.TranslateAccelerator(ref MSG msg, int grfModifiers)
{
// Handle tabbing out of the WebOC
if (msg.message == NativeMethods.WM_KEYDOWN && (int)msg.wParam == NativeMethods.VK_TAB)
{
FocusNavigationDirection direction =
(grfModifiers & 1/*KEYMOD_SHIFT*/) != 0 ?
FocusNavigationDirection.Previous : FocusNavigationDirection.Next;
// For the WebOCHostedInBrowserProcess case, we need to switch to the right thread.
Host.Dispatcher.Invoke(
DispatcherPriority.Send, new SendOrPostCallback(MoveFocusCallback), direction);
return NativeMethods.S_OK;
}
return NativeMethods.S_FALSE;
}
///
/// Critical: Access the critical Host property.
/// TAS: Host is not exposed.
///
[SecurityCritical, SecurityTreatAsSafe]
private void MoveFocusCallback(object direction)
{
Host.MoveFocus(new TraversalRequest((FocusNavigationDirection)direction));
}
};
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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