Win32.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / AccessControl / Win32.cs / 1305376 / Win32.cs
                        
                        
                            using Microsoft.Win32; 
using Microsoft.Win32.SafeHandles;
using System;
using System.Collections;
using System.Runtime.CompilerServices; 
using System.Runtime.InteropServices;
#if FEATURE_CORRUPTING_EXCEPTIONS 
using System.Runtime.ExceptionServices; 
#endif // FEATURE_CORRUPTING_EXCEPTIONS
using System.Runtime.Versioning; 
using System.Security;
using System.Security.Permissions;
using System.Security.Principal;
using System.Diagnostics.Contracts; 

namespace System.Security.AccessControl 
{ 
    internal static class Win32
    { 
        internal const System.Int32 TRUE = 1;

        //
        // Wrapper around advapi32.ConvertSecurityDescriptorToStringSecurityDescriptorW 
        //
 
        [System.Security.SecurityCritical]  // auto-generated 
        [SecurityPermission( SecurityAction.Assert, UnmanagedCode=true )]
        internal static int ConvertSdToSddl( 
            byte[] binaryForm,
            int requestedRevision,
            SecurityInfos si,
            out string resultSddl ) 
        {
            int errorCode; 
            IntPtr ByteArray; 
            uint ByteArraySize = 0;
 
            if ( TRUE != Win32Native.ConvertSdToStringSd( binaryForm, ( uint )requestedRevision, ( uint )si, out ByteArray, ref ByteArraySize ))
            {
                errorCode = Marshal.GetLastWin32Error();
                goto Error; 
            }
 
            // 
            // Extract data from the returned pointer
            // 

            resultSddl = Marshal.PtrToStringUni( ByteArray );

            // 
            // Now is a good time to get rid of the returned pointer
            // 
 
            Win32Native.LocalFree( ByteArray );
 
            return 0;

        Error:
 
            resultSddl = null;
 
            if ( errorCode == Win32Native.ERROR_NOT_ENOUGH_MEMORY ) 
            {
                throw new OutOfMemoryException(); 
            }

            return errorCode;
        } 

        // 
        // Wrapper around advapi32.GetSecurityInfo 
        //
 
        [System.Security.SecurityCritical]  // auto-generated
#if FEATURE_CORRUPTING_EXCEPTIONS
        [HandleProcessCorruptedStateExceptions] //
#endif // FEATURE_CORRUPTING_EXCEPTIONS 

        internal static int GetSecurityInfo( 
            ResourceType resourceType, 
            string name,
            SafeHandle handle, 
            AccessControlSections accessControlSections,
            out RawSecurityDescriptor resultSd
            )
        { 
            resultSd = null;
 
            // 
            // Demand unmanaged code permission
            // The integrator layer is free to assert this permission 
            // and, in turn, demand another permission of its caller
            //

            new SecurityPermission( SecurityPermissionFlag.UnmanagedCode ).Demand(); 

            int errorCode; 
            IntPtr SidOwner, SidGroup, Dacl, Sacl, ByteArray; 
            SecurityInfos SecurityInfos = 0;
            Privilege privilege = null; 

            if (( accessControlSections & AccessControlSections.Owner ) != 0 )
            {
                SecurityInfos |= SecurityInfos.Owner; 
            }
 
            if (( accessControlSections & AccessControlSections.Group ) != 0 ) 
            {
                SecurityInfos |= SecurityInfos.Group; 
            }

            if (( accessControlSections & AccessControlSections.Access ) != 0 )
            { 
                SecurityInfos |= SecurityInfos.DiscretionaryAcl;
            } 
 
            if (( accessControlSections & AccessControlSections.Audit ) != 0 )
            { 
                SecurityInfos |= SecurityInfos.SystemAcl;
                privilege = new Privilege( Privilege.Security );
            }
 
            // Ensure that the finally block will execute
            RuntimeHelpers.PrepareConstrainedRegions(); 
 
            try
            { 
                if ( privilege != null )
                {
                    try
                    { 
                        privilege.Enable();
                    } 
                    catch (PrivilegeNotHeldException) 
                    {
                        // we will ignore this exception and press on just in case this is a remote resource 
                    }
                }

                if ( name != null ) 
                {
                    errorCode = ( int )Win32Native.GetSecurityInfoByName( name, ( uint )resourceType, ( uint )SecurityInfos, out SidOwner, out SidGroup, out Dacl, out Sacl, out ByteArray ); 
                } 
                else if (handle != null)
                { 
                    if (handle.IsInvalid)
                    {
                        throw new ArgumentException(
                            Environment.GetResourceString( "Argument_InvalidSafeHandle" ), 
                            "handle" );
                    } 
                    else 
                    {
                        errorCode = ( int )Win32Native.GetSecurityInfoByHandle( handle, ( uint )resourceType, ( uint )SecurityInfos, out SidOwner, out SidGroup, out Dacl, out Sacl, out ByteArray ); 
                    }
                }
                else
                { 
                    // both are null, shouldn't happen
                    throw new SystemException(); 
                } 

                if ( errorCode == Win32Native.ERROR_SUCCESS && IntPtr.Zero.Equals(ByteArray) ) 
                {
                    //
                    // This means that the object doesn't have a security descriptor. And thus we throw
                    // a specific exception for the caller to catch and handle properly. 
                    //
                    throw new InvalidOperationException(Environment.GetResourceString( "InvalidOperation_NoSecurityDescriptor" )); 
                } 
                else if (errorCode == Win32Native.ERROR_NOT_ALL_ASSIGNED ||
                         errorCode == Win32Native.ERROR_PRIVILEGE_NOT_HELD) 
                {
                    throw new PrivilegeNotHeldException( Privilege.Security );
                }
                else if ( errorCode == Win32Native.ERROR_ACCESS_DENIED || 
                    errorCode == Win32Native.ERROR_CANT_OPEN_ANONYMOUS )
                { 
                    throw new UnauthorizedAccessException(); 
                }
 
                if ( errorCode != Win32Native.ERROR_SUCCESS )
                {
                    goto Error;
                } 
            }
            catch 
            { 
                // protection against exception filter-based luring attacks
                if ( privilege != null ) 
                {
                    privilege.Revert();
                }
                throw; 
            }
            finally 
            { 
                if ( privilege != null )
                { 
                    privilege.Revert();
                }
            }
 
            //
            // Extract data from the returned pointer 
            // 

            uint Length = Win32Native.GetSecurityDescriptorLength( ByteArray ); 

            byte[] BinaryForm = new byte[Length];

            Marshal.Copy( ByteArray, BinaryForm, 0, ( int )Length ); 

            Win32Native.LocalFree( ByteArray ); 
 
            resultSd = new RawSecurityDescriptor( BinaryForm, 0 );
 
            return Win32Native.ERROR_SUCCESS;

        Error:
 
            if ( errorCode == Win32Native.ERROR_NOT_ENOUGH_MEMORY )
            { 
                throw new OutOfMemoryException(); 
            }
 
            return errorCode;
        }

        // 
        // Wrapper around advapi32.SetNamedSecurityInfoW and advapi32.SetSecurityInfo
        // 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
#if FEATURE_CORRUPTING_EXCEPTIONS
        [HandleProcessCorruptedStateExceptions] //
#endif // FEATURE_CORRUPTING_EXCEPTIONS 
        internal static int SetSecurityInfo(
            ResourceType type, 
            string name, 
            SafeHandle handle,
            SecurityInfos securityInformation, 
            SecurityIdentifier owner,
            SecurityIdentifier group,
            GenericAcl sacl,
            GenericAcl dacl ) 
        {
            int errorCode; 
            int Length; 
            byte[] OwnerBinary = null, GroupBinary = null, SaclBinary = null, DaclBinary = null;
            Privilege securityPrivilege = null; 

            //
            // Demand unmanaged code permission
            // The integrator layer is free to assert this permission 
            // and, in turn, demand another permission of its caller
            // 
 
            new SecurityPermission( SecurityPermissionFlag.UnmanagedCode ).Demand();
 
            if ( owner != null )
            {
                Length = owner.BinaryLength;
                OwnerBinary = new byte[Length]; 
                owner.GetBinaryForm( OwnerBinary, 0 );
            } 
 
            if ( group != null )
            { 
                Length = group.BinaryLength;
                GroupBinary = new byte[Length];
                group.GetBinaryForm( GroupBinary, 0 );
            } 

            if ( dacl != null ) 
            { 
                Length = dacl.BinaryLength;
                DaclBinary = new byte[Length]; 
                dacl.GetBinaryForm( DaclBinary, 0 );
            }

            if ( sacl != null ) 
            {
                Length = sacl.BinaryLength; 
                SaclBinary = new byte[Length]; 
                sacl.GetBinaryForm( SaclBinary, 0 );
            } 

            if ( ( securityInformation & SecurityInfos.SystemAcl ) != 0 )
            {
                // 
                // Enable security privilege if trying to set a SACL.
                // Note: even setting it by handle needs this privilege enabled! 
                // 

                securityPrivilege = new Privilege( Privilege.Security ); 
            }

            // Ensure that the finally block will execute
            RuntimeHelpers.PrepareConstrainedRegions(); 

            try 
            { 
                if ( securityPrivilege != null )
                { 
                    try
                    {
                        securityPrivilege.Enable();
                    } 
                    catch (PrivilegeNotHeldException)
                    { 
                        // we will ignore this exception and press on just in case this is a remote resource 
                    }
                } 

                if ( name != null )
                {
                    errorCode = ( int )Win32Native.SetSecurityInfoByName( name, ( uint )type, ( uint )securityInformation, OwnerBinary, GroupBinary, DaclBinary, SaclBinary ); 
                }
                else if (handle != null) 
                { 
                    if (handle.IsInvalid)
                    { 
                        throw new ArgumentException(
                            Environment.GetResourceString( "Argument_InvalidSafeHandle" ),
                            "handle" );
                    } 
                    else
                    { 
                        errorCode = ( int )Win32Native.SetSecurityInfoByHandle( handle, ( uint )type, ( uint )securityInformation, OwnerBinary, GroupBinary, DaclBinary, SaclBinary ); 
                    }
                } 
                else
                {
                    // both are null, shouldn't happen
                    Contract.Assert( false, "Internal error: both name and handle are null" ); 
                    throw new InvalidProgramException();
                } 
 
                if (errorCode == Win32Native.ERROR_NOT_ALL_ASSIGNED ||
                    errorCode == Win32Native.ERROR_PRIVILEGE_NOT_HELD) 
                {
                    throw new PrivilegeNotHeldException( Privilege.Security );
                }
                else if ( errorCode == Win32Native.ERROR_ACCESS_DENIED || 
                    errorCode == Win32Native.ERROR_CANT_OPEN_ANONYMOUS )
                { 
                    throw new UnauthorizedAccessException(); 
                }
                else if ( errorCode != Win32Native.ERROR_SUCCESS ) 
                {
                    goto Error;
                }
            } 
            catch
            { 
                // protection against exception filter-based luring attacks 
                if ( securityPrivilege != null )
                { 
                    securityPrivilege.Revert();
                }
                throw;
            } 
            finally
            { 
                if ( securityPrivilege != null ) 
                {
                    securityPrivilege.Revert(); 
                }
            }

            return 0; 

        Error: 
 
            if ( errorCode == Win32Native.ERROR_NOT_ENOUGH_MEMORY )
            { 
                throw new OutOfMemoryException();
            }

            return errorCode; 
        }
    } 
} 

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