WinFormsSecurity.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / WinFormsSecurity.cs / 2 / WinFormsSecurity.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms {
 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System;
    using System.IO; 
    using System.Security.Permissions;
    using System.Security; 
    using System.Drawing.Printing; 

    internal static class IntSecurity { 
        public static readonly TraceSwitch SecurityDemand = new TraceSwitch("SecurityDemand", "Trace when security demands occur.");
#if DEBUG
        public static readonly BooleanSwitch MapSafeTopLevelToSafeSub = new BooleanSwitch("MapSafeTopLevelToSafeSub", "Maps the SafeTopLevelWindow UI permission to SafeSubWindow permission. Must restart to take effect.");
#endif 

        private static CodeAccessPermission adjustCursorClip; 
        private static CodeAccessPermission affectMachineState; 
        private static CodeAccessPermission affectThreadBehavior;
        private static CodeAccessPermission allPrinting; 
        private static PermissionSet        allPrintingAndUnmanagedCode; // Can't assert twice in the same method
        private static CodeAccessPermission allWindows;
        private static CodeAccessPermission clipboardRead;
        private static CodeAccessPermission clipboardOwn; 
        private static PermissionSet        clipboardWrite; // Can't assert twice in the same method
        private static CodeAccessPermission changeWindowRegionForTopLevel; 
        private static CodeAccessPermission controlFromHandleOrLocation; 
        private static CodeAccessPermission createAnyWindow;
        private static CodeAccessPermission createGraphicsForControl; 
        private static CodeAccessPermission defaultPrinting;
        private static CodeAccessPermission fileDialogCustomization;
        private static CodeAccessPermission fileDialogOpenFile;
        private static CodeAccessPermission fileDialogSaveFile; 
        private static CodeAccessPermission getCapture;
        private static CodeAccessPermission getParent; 
        private static CodeAccessPermission manipulateWndProcAndHandles; 
        private static CodeAccessPermission modifyCursor;
        private static CodeAccessPermission modifyFocus; 
        private static CodeAccessPermission objectFromWin32Handle;
        private static CodeAccessPermission safePrinting;
        private static CodeAccessPermission safeSubWindows;
        private static CodeAccessPermission safeTopLevelWindows; 
        private static CodeAccessPermission sendMessages;
        private static CodeAccessPermission sensitiveSystemInformation; 
        private static CodeAccessPermission transparentWindows; 
        private static CodeAccessPermission topLevelWindow;
        private static CodeAccessPermission unmanagedCode; 
        private static CodeAccessPermission unrestrictedWindows;
        private static CodeAccessPermission windowAdornmentModification;

        /* Unused permissions 
        private static CodeAccessPermission win32HandleManipulation;
        private static CodeAccessPermission minimizeWindowProgrammatically; 
        private static CodeAccessPermission restrictedWebBrowserPermission; 
        private static CodeAccessPermission noPrinting;
        private static CodeAccessPermission topMostWindow; 
        private static CodeAccessPermission unrestrictedEnvironment;
        private static CodeAccessPermission autoComplete;
        private static CodeAccessPermission defaultWebBrowserPermission;
        private static CodeAccessPermission screenDC; 
        */
 
        // 
        // Property accessors for permissions.  Don't allocate permissions up front -- always
        // demand create them.  A great many codepaths never need all these permissions so it is wasteful to 
        // create them.
        //

 
        public static CodeAccessPermission AdjustCursorClip {
            get { 
                if (adjustCursorClip == null) { 
                    adjustCursorClip = AllWindows;
                } 
                return adjustCursorClip;
            }
        }
 
        public static CodeAccessPermission AdjustCursorPosition {
            get { 
                return AllWindows; 
            }
        } 

        public static CodeAccessPermission AffectMachineState {
            get {
                if (affectMachineState == null) { 
                    affectMachineState = UnmanagedCode;
                } 
                return affectMachineState; 
            }
        } 

        public static CodeAccessPermission AffectThreadBehavior {
            get {
                if (affectThreadBehavior == null) { 
                    affectThreadBehavior = UnmanagedCode;
                } 
                return affectThreadBehavior; 
            }
        } 

        public static CodeAccessPermission AllPrinting {
            get {
                if (allPrinting == null) { 
                    allPrinting = new PrintingPermission(PrintingPermissionLevel.AllPrinting);
                } 
                return allPrinting; 
            }
        } 

        public static PermissionSet AllPrintingAndUnmanagedCode { // Can't assert twice in the same method. See ASURT 52788.
            get {
                if (allPrintingAndUnmanagedCode == null) { 
                    PermissionSet temp = new PermissionSet(PermissionState.None);
                    temp.SetPermission(IntSecurity.UnmanagedCode); 
                    temp.SetPermission(IntSecurity.AllPrinting); 
                    allPrintingAndUnmanagedCode = temp;
                } 
                return allPrintingAndUnmanagedCode;
            }
        }
 
        public static CodeAccessPermission AllWindows {
            get { 
                if (allWindows == null) { 
                    allWindows = new UIPermission(UIPermissionWindow.AllWindows);
                } 
                return allWindows;
            }
        }
 
        public static CodeAccessPermission ClipboardRead {
            get { 
                if (clipboardRead == null) { 
                    clipboardRead = new UIPermission(UIPermissionClipboard.AllClipboard);
                } 
                return clipboardRead;
            }
        }
 
        public static CodeAccessPermission ClipboardOwn {
            get { 
                if (clipboardOwn == null) { 
                    clipboardOwn = new UIPermission(UIPermissionClipboard.OwnClipboard);
                } 
                return clipboardOwn;
            }
        }
 
        public static PermissionSet ClipboardWrite { // Can't assert OwnClipboard & UnmanagedCode in the same context, need permission set.
            get { 
                if (clipboardWrite == null) { 
                    clipboardWrite = new PermissionSet(PermissionState.None);
                    clipboardWrite.SetPermission(IntSecurity.UnmanagedCode); 
                    clipboardWrite.SetPermission(IntSecurity.ClipboardOwn);
                }
                return clipboardWrite;
            } 
        }
 
        public static CodeAccessPermission ChangeWindowRegionForTopLevel { 
            get {
                if (changeWindowRegionForTopLevel == null) { 
                    changeWindowRegionForTopLevel = AllWindows;
                }
                return changeWindowRegionForTopLevel;
            } 
        }
 
        public static CodeAccessPermission ControlFromHandleOrLocation { 
            get {
                if (controlFromHandleOrLocation == null) { 
                    controlFromHandleOrLocation = AllWindows;
                }
                return controlFromHandleOrLocation;
            } 
        }
 
        public static CodeAccessPermission CreateAnyWindow { 
            get {
                if (createAnyWindow == null) { 
                    createAnyWindow = SafeSubWindows;
                }
                return createAnyWindow;
            } 
        }
 
        public static CodeAccessPermission CreateGraphicsForControl { 
            get {
                if (createGraphicsForControl == null) { 
                    createGraphicsForControl = SafeSubWindows;
                }
                return createGraphicsForControl;
            } 
        }
 
        public static CodeAccessPermission DefaultPrinting { 
            get {
                if (defaultPrinting == null) { 
                    defaultPrinting = new PrintingPermission(PrintingPermissionLevel.DefaultPrinting);
                }
                return defaultPrinting;
            } 
        }
 
        public static CodeAccessPermission FileDialogCustomization { 
            get {
                if (fileDialogCustomization == null) { 
                    fileDialogCustomization = new FileIOPermission(PermissionState.Unrestricted);
                }
                return fileDialogCustomization;
            } 
        }
 
        public static CodeAccessPermission FileDialogOpenFile { 
            get {
                if (fileDialogOpenFile == null) { 
                    fileDialogOpenFile = new FileDialogPermission(FileDialogPermissionAccess.Open);
                }
                return fileDialogOpenFile;
            } 
        }
 
        public static CodeAccessPermission FileDialogSaveFile { 
            get {
                if (fileDialogSaveFile == null) { 
                    fileDialogSaveFile = new FileDialogPermission(FileDialogPermissionAccess.Save);
                }
                return fileDialogSaveFile;
            } 
        }
 
        /* Unused 
        public static CodeAccessPermission RestrictedWebBrowserPermission {
            get { 
                if (restrictedWebBrowserPermission == null) {
                    restrictedWebBrowserPermission = new WebBrowserPermission(WebBrowserPermissionLevel.Restricted);
                }
                return restrictedWebBrowserPermission; 
            }
        } 
 
        public static CodeAccessPermission DefaultWebBrowserPermission {
            get { 
                if (defaultWebBrowserPermission == null) {
                    defaultWebBrowserPermission = new WebBrowserPermission(WebBrowserPermissionLevel.Default);
                }
                return defaultWebBrowserPermission; 
            }
        } 
        */ 

        public static CodeAccessPermission GetCapture { 
            get {
                if (getCapture == null) {
                    getCapture = AllWindows;
                } 
                return getCapture;
            } 
        } 

        public static CodeAccessPermission GetParent { 
            get {
                if (getParent == null) {
                    getParent = AllWindows;
                } 
                return getParent;
            } 
        } 

        public static CodeAccessPermission ManipulateWndProcAndHandles { 
            get {
                if (manipulateWndProcAndHandles == null) {
                    manipulateWndProcAndHandles = AllWindows;
                } 
                return manipulateWndProcAndHandles;
            } 
        } 

        /* Unused 
        public static CodeAccessPermission MinimizeWindowProgrammatically {
            get {
                if (minimizeWindowProgrammatically == null) {
                    minimizeWindowProgrammatically = AllWindows; 
                }
                return minimizeWindowProgrammatically; 
            } 
        }
        */ 

        public static CodeAccessPermission ModifyCursor {
            get {
                if (modifyCursor == null) { 
                    modifyCursor = SafeSubWindows;
                } 
                return modifyCursor; 
            }
        } 

        public static CodeAccessPermission ModifyFocus {
            get {
                if (modifyFocus == null) { 
                    modifyFocus = AllWindows;
                } 
                return modifyFocus; 
            }
        } 

        /* Unused
        public static CodeAccessPermission NoPrinting {
            get { 
                if (noPrinting == null) {
                    noPrinting = new PrintingPermission(PrintingPermissionLevel.NoPrinting); 
                } 
                return noPrinting;
            } 
        }
        */

        public static CodeAccessPermission ObjectFromWin32Handle { 
            get {
                if (objectFromWin32Handle == null) { 
                    objectFromWin32Handle = UnmanagedCode; 
                }
                return objectFromWin32Handle; 
            }
        }

        public static CodeAccessPermission SafePrinting { 
            get {
                if (safePrinting == null) { 
                    safePrinting = new PrintingPermission(PrintingPermissionLevel.SafePrinting); 
                }
                return safePrinting; 
            }
        }

        public static CodeAccessPermission SafeSubWindows { 
            get {
                if (safeSubWindows == null) { 
                    safeSubWindows = new UIPermission(UIPermissionWindow.SafeSubWindows); 
                }
                return safeSubWindows; 
            }
        }

        public static CodeAccessPermission SafeTopLevelWindows { 
            get {
                if (safeTopLevelWindows == null) { 
                    safeTopLevelWindows = new UIPermission(UIPermissionWindow.SafeTopLevelWindows); 
                }
                return safeTopLevelWindows; 
            }
        }

        public static CodeAccessPermission SendMessages { 
            get {
                if (sendMessages == null) { 
                    sendMessages = UnmanagedCode; 
                }
                return sendMessages; 
            }
        }

        public static CodeAccessPermission SensitiveSystemInformation { 
            get {
                if (sensitiveSystemInformation == null) { 
                    sensitiveSystemInformation = new EnvironmentPermission(PermissionState.Unrestricted); 
                }
                return sensitiveSystemInformation; 
            }
        }

        /* Unused 
        public static CodeAccessPermission ScreenDC {
            get { 
                if (screenDC == null) { 
                    screenDC = AllWindows;
                } 
                return screenDC;
            }
        }
        */ 

        public static CodeAccessPermission TransparentWindows { 
            get { 
                if (transparentWindows == null) {
                    transparentWindows = AllWindows; 
                }
                return transparentWindows;
            }
        } 

        public static CodeAccessPermission TopLevelWindow { 
            get { 
                if (topLevelWindow == null) {
                    topLevelWindow = SafeTopLevelWindows; 
                }
                return topLevelWindow;
            }
        } 

        /* Unused 
        public static CodeAccessPermission TopMostWindow { 
            get {
                if (topMostWindow == null) { 
                    topMostWindow = AllWindows;
                }
                return topMostWindow;
            } 
        }
        */ 
 
        public static CodeAccessPermission UnmanagedCode {
            get { 
                if (unmanagedCode == null) {
                    unmanagedCode = new SecurityPermission(SecurityPermissionFlag.UnmanagedCode);
                }
                return unmanagedCode; 
            }
        } 
 
        /*
        public static CodeAccessPermission UnrestrictedEnvironment { 
            get {
                if (unrestrictedEnvironment == null) {
                    unrestrictedEnvironment = new EnvironmentPermission(PermissionState.Unrestricted);
                } 
                return unrestrictedEnvironment;
            } 
        } 
        */
 
        public static CodeAccessPermission UnrestrictedWindows {
            get {
                if (unrestrictedWindows == null) {
                    unrestrictedWindows = AllWindows; 
                }
                return unrestrictedWindows; 
            } 
        }
 
        /* FXCop avoid unused code
        public static CodeAccessPermission Win32HandleManipulation {
            get {
                if (win32HandleManipulation == null) { 
                    win32HandleManipulation = UnmanagedCode;
                } 
                return win32HandleManipulation; 
            }
        } 
        */

        public static CodeAccessPermission WindowAdornmentModification {
            get { 
                if (windowAdornmentModification == null) {
                    windowAdornmentModification = AllWindows; 
                } 
                return windowAdornmentModification;
            } 
        }

        /* unused
        public static CodeAccessPermission AutoComplete { 
            get {
                if (autoComplete == null) { 
                    autoComplete = UnmanagedCode; 
                }
                return autoComplete; 
            }
        }
        */
 
        internal static string UnsafeGetFullPath(string fileName) {
            string full = fileName; 
 
            FileIOPermission fiop = new FileIOPermission( PermissionState.None );
            fiop.AllFiles = FileIOPermissionAccess.PathDiscovery; 
            fiop.Assert();
            try {
                full = Path.GetFullPath(fileName);
            } 
            finally {
                CodeAccessPermission.RevertAssert(); 
            } 
            return full;
        } 

        /// SECREVIEW: ReviewImperativeSecurity
        ///   vulnerability to watch out for: A method uses imperative security and might be constructing the permission using state information or return values that can change while the demand is active.
        ///   reason for exclude: fileName is a local variable and not subject to race conditions. 
        [SuppressMessage("Microsoft.Security", "CA2103:ReviewImperativeSecurity")]
        internal static void DemandFileIO(FileIOPermissionAccess access, string fileName) { 
            new FileIOPermission(access, UnsafeGetFullPath(fileName)).Demand(); 
        }
    } 
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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