Win32.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / AccessControl / Win32.cs / 1 / Win32.cs
                        
                        
                            using Microsoft.Win32; 
using Microsoft.Win32.SafeHandles;
using System;
using System.Collections;
using System.Runtime.CompilerServices; 
using System.Runtime.InteropServices;
using System.Runtime.Versioning; 
using System.Security; 
using System.Security.Permissions;
using System.Security.Principal; 

namespace System.Security.AccessControl
{
    internal static class Win32 
    {
        internal const System.Int32 TRUE = 1; 
 
        private static bool _isConversionSupported;
 
        static Win32()
        {
            //
            // SDDL-to-binary conversion only supported on W2K, XP and above 
            //
 
            Win32Native.OSVERSIONINFO osvi = new Win32Native.OSVERSIONINFO(); 

            if ( !Win32Native.GetVersionEx( osvi )) 
            {
                BCLDebug.Assert( false, "OSVersion native call failed" );
                throw new SystemException( Environment.GetResourceString( "InvalidOperation_GetVersion" ));
            } 

            if ( osvi.PlatformId == Win32Native.VER_PLATFORM_WIN32_NT && 
                osvi.MajorVersion >= 5 ) 
            {
                _isConversionSupported = true; 
            }
            else
            {
                _isConversionSupported = false; 
            }
        } 
 
        internal static bool IsSddlConversionSupported()
        { 
            return _isConversionSupported;
        }

        internal static bool IsLsaPolicySupported() 
        {
            return _isConversionSupported; 
        } 

        // 
        // Wrapper around advapi32.ConvertSecurityDescriptorToStringSecurityDescriptorW
        //

        [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 ( !IsSddlConversionSupported()) 
            { 
                throw new PlatformNotSupportedException( Environment.GetResourceString( "PlatformNotSupported_Win9x" ));
            } 

            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
        // 

        internal static int GetSecurityInfo(
            ResourceType resourceType,
            string name, 
            SafeHandle handle,
            AccessControlSections accessControlSections, 
            out RawSecurityDescriptor resultSd 
            )
        { 
            resultSd = null;

            if (!IsLsaPolicySupported())
            { 
                throw new PlatformNotSupportedException( Environment.GetResourceString( "PlatformNotSupported_RequiresNT" ));
            } 
 
            //
            // 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 
        // 

        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        internal static int SetSecurityInfo(
            ResourceType type,
            string name, 
            SafeHandle handle,
            SecurityInfos securityInformation, 
            SecurityIdentifier owner, 
            SecurityIdentifier group,
            GenericAcl sacl, 
            GenericAcl dacl )
        {
            if (!IsLsaPolicySupported())
            { 
                throw new PlatformNotSupportedException( Environment.GetResourceString( "PlatformNotSupported_RequiresNT" ));
            } 
 
            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
                    BCLDebug.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; 
        } 
    }
}
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