RegistryPermission.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Permissions / RegistryPermission.cs / 1 / RegistryPermission.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  RegistryPermission.cs
// 
 
namespace System.Security.Permissions
{ 
    using System;
    using SecurityElement = System.Security.SecurityElement;
#if !FEATURE_PAL
    using System.Security.AccessControl; 
#endif
    using System.Security.Util; 
    using System.IO; 
    using System.Globalization;
    using System.Runtime.Serialization; 

    [Flags,Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
    public enum RegistryPermissionAccess 
    {
        NoAccess = 0x00, 
        Read = 0x01, 
        Write = 0x02,
        Create = 0x04, 
        AllAccess = 0x07,
    }

[System.Runtime.InteropServices.ComVisible(true)] 
    [Serializable()] sealed public class RegistryPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission
    { 
        private StringExpressionSet m_read; 
        private StringExpressionSet m_write;
        private StringExpressionSet m_create; 
        [OptionalField(VersionAdded = 2)]
        private StringExpressionSet m_viewAcl;
        [OptionalField(VersionAdded = 2)]
        private StringExpressionSet m_changeAcl; 
        private bool m_unrestricted;
 
 
        public RegistryPermission(PermissionState state)
        { 
            if (state == PermissionState.Unrestricted)
            {
                m_unrestricted = true;
            } 
            else if (state == PermissionState.None)
            { 
                m_unrestricted = false; 
            }
            else 
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState"));
            }
        } 

        public RegistryPermission( RegistryPermissionAccess access, String pathList ) 
        { 
            SetPathList( access, pathList );
        } 

#if !FEATURE_PAL
        public RegistryPermission( RegistryPermissionAccess access, AccessControlActions control, String pathList )
        { 
            m_unrestricted = false;
            AddPathList( access, control, pathList ); 
        } 
#endif
 
        public void SetPathList( RegistryPermissionAccess access, String pathList )
        {
            VerifyAccess( access );
 
            m_unrestricted = false;
 
            if ((access & RegistryPermissionAccess.Read) != 0) 
                m_read = null;
 
            if ((access & RegistryPermissionAccess.Write) != 0)
                m_write = null;

            if ((access & RegistryPermissionAccess.Create) != 0) 
                m_create = null;
 
            AddPathList( access, pathList ); 
        }
 
#if !FEATURE_PAL
        internal void SetPathList( AccessControlActions control, String pathList )
        {
            m_unrestricted = false; 

            if ((control & AccessControlActions.View) != 0) 
                m_viewAcl = null; 

            if ((control & AccessControlActions.Change) != 0) 
                m_changeAcl = null;

            AddPathList( RegistryPermissionAccess.NoAccess, control, pathList );
        } 
#endif
 
 
        public void AddPathList( RegistryPermissionAccess access, String pathList )
        { 
#if !FEATURE_PAL
            AddPathList( access, AccessControlActions.None, pathList );
        }
 
        public void AddPathList( RegistryPermissionAccess access, AccessControlActions control, String pathList )
        { 
#endif 
            VerifyAccess( access );
 
            if ((access & RegistryPermissionAccess.Read) != 0)
            {
                if (m_read == null)
                    m_read = new StringExpressionSet(); 
                m_read.AddExpressions( pathList );
            } 
 
            if ((access & RegistryPermissionAccess.Write) != 0)
            { 
                if (m_write == null)
                    m_write = new StringExpressionSet();
                m_write.AddExpressions( pathList );
            } 

            if ((access & RegistryPermissionAccess.Create) != 0) 
            { 
                if (m_create == null)
                    m_create = new StringExpressionSet(); 
                m_create.AddExpressions( pathList );
            }

#if !FEATURE_PAL 
            if ((control & AccessControlActions.View) != 0)
            { 
                if (m_viewAcl == null) 
                    m_viewAcl = new StringExpressionSet();
                m_viewAcl.AddExpressions( pathList ); 
            }

            if ((control & AccessControlActions.Change) != 0)
            { 
                if (m_changeAcl == null)
                    m_changeAcl = new StringExpressionSet(); 
                m_changeAcl.AddExpressions( pathList ); 
            }
#endif 
        }

        public String GetPathList( RegistryPermissionAccess access )
        { 
            VerifyAccess( access );
            ExclusiveAccess( access ); 
 
            if ((access & RegistryPermissionAccess.Read) != 0)
            { 
                if (m_read == null)
                {
                    return "";
                } 
                return m_read.ToString();
            } 
 
            if ((access & RegistryPermissionAccess.Write) != 0)
            { 
                if (m_write == null)
                {
                    return "";
                } 
                return m_write.ToString();
            } 
 
            if ((access & RegistryPermissionAccess.Create) != 0)
            { 
                if (m_create == null)
                {
                    return "";
                } 
                return m_create.ToString();
            } 
 
            /* not reached */
 
            return "";
        }

        private void VerifyAccess( RegistryPermissionAccess access ) 
        {
            if ((access & ~RegistryPermissionAccess.AllAccess) != 0) 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_EnumIllegalVal"), (int)access)); 
        }
 
        private void ExclusiveAccess( RegistryPermissionAccess access )
        {
            if (access == RegistryPermissionAccess.NoAccess)
            { 
                throw new ArgumentException( Environment.GetResourceString("Arg_EnumNotSingleFlag") );
            } 
 
            if (((int) access & ((int)access-1)) != 0)
            { 
                throw new ArgumentException( Environment.GetResourceString("Arg_EnumNotSingleFlag") );
            }
        }
 
        private bool IsEmpty()
        { 
            return (!m_unrestricted && 
                    (this.m_read == null || this.m_read.IsEmpty()) &&
                    (this.m_write == null || this.m_write.IsEmpty()) && 
                    (this.m_create == null || this.m_create.IsEmpty()) &&
                    (this.m_viewAcl == null || this.m_viewAcl.IsEmpty()) &&
                    (this.m_changeAcl == null || this.m_changeAcl.IsEmpty()));
        } 

        //------------------------------------------------------ 
        // 
        // CODEACCESSPERMISSION IMPLEMENTATION
        // 
        //-----------------------------------------------------

        public bool IsUnrestricted()
        { 
            return m_unrestricted;
        } 
 
        //-----------------------------------------------------
        // 
        // IPERMISSION IMPLEMENTATION
        //
        //-----------------------------------------------------
 
        public override bool IsSubsetOf(IPermission target)
        { 
            if (target == null) 
            {
                return this.IsEmpty(); 
            }

            RegistryPermission operand = target as RegistryPermission;
            if (operand == null) 
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
 
            if (operand.IsUnrestricted()) 
                return true;
            else if (this.IsUnrestricted()) 
                return false;
            else
                return ((this.m_read == null || this.m_read.IsSubsetOf( operand.m_read )) &&
                        (this.m_write == null || this.m_write.IsSubsetOf( operand.m_write )) && 
                        (this.m_create == null || this.m_create.IsSubsetOf( operand.m_create )) &&
                        (this.m_viewAcl == null || this.m_viewAcl.IsSubsetOf( operand.m_viewAcl )) && 
                        (this.m_changeAcl == null || this.m_changeAcl.IsSubsetOf( operand.m_changeAcl ))); 
        }
 
        public override IPermission Intersect(IPermission target)
        {
            if (target == null)
            { 
                return null;
            } 
            else if (!VerifyType(target)) 
            {
                throw new 
                    ArgumentException(
                                    String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName)
                                     );
            } 
            else if (this.IsUnrestricted())
            { 
                return target.Copy(); 
            }
 
            RegistryPermission operand = (RegistryPermission)target;
            if (operand.IsUnrestricted())
            {
                return this.Copy(); 
            }
 
 
            StringExpressionSet intersectRead = this.m_read == null ? null : this.m_read.Intersect( operand.m_read );
            StringExpressionSet intersectWrite = this.m_write == null ? null : this.m_write.Intersect( operand.m_write ); 
            StringExpressionSet intersectCreate = this.m_create == null ? null : this.m_create.Intersect( operand.m_create );
            StringExpressionSet intersectViewAcl = this.m_viewAcl == null ? null : this.m_viewAcl.Intersect( operand.m_viewAcl );
            StringExpressionSet intersectChangeAcl = this.m_changeAcl == null ? null : this.m_changeAcl.Intersect( operand.m_changeAcl );
 
            if ((intersectRead == null || intersectRead.IsEmpty()) &&
                (intersectWrite == null || intersectWrite.IsEmpty()) && 
                (intersectCreate == null || intersectCreate.IsEmpty()) && 
                (intersectViewAcl == null || intersectViewAcl.IsEmpty()) &&
                (intersectChangeAcl == null || intersectChangeAcl.IsEmpty())) 
            {
                return null;
            }
 
            RegistryPermission intersectPermission = new RegistryPermission(PermissionState.None);
            intersectPermission.m_unrestricted = false; 
            intersectPermission.m_read = intersectRead; 
            intersectPermission.m_write = intersectWrite;
            intersectPermission.m_create = intersectCreate; 
            intersectPermission.m_viewAcl = intersectViewAcl;
            intersectPermission.m_changeAcl = intersectChangeAcl;

            return intersectPermission; 
        }
 
        public override IPermission Union(IPermission other) 
        {
            if (other == null) 
            {
                return this.Copy();
            }
            else if (!VerifyType(other)) 
            {
                throw new 
                    ArgumentException( 
                                    String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName)
                                     ); 
            }

            RegistryPermission operand = (RegistryPermission)other;
 
            if (this.IsUnrestricted() || operand.IsUnrestricted())
            { 
                return new RegistryPermission( PermissionState.Unrestricted ); 
            }
 
            StringExpressionSet unionRead = this.m_read == null ? operand.m_read : this.m_read.Union( operand.m_read );
            StringExpressionSet unionWrite = this.m_write == null ? operand.m_write : this.m_write.Union( operand.m_write );
            StringExpressionSet unionCreate = this.m_create == null ? operand.m_create : this.m_create.Union( operand.m_create );
            StringExpressionSet unionViewAcl = this.m_viewAcl == null ? operand.m_viewAcl : this.m_viewAcl.Union( operand.m_viewAcl ); 
            StringExpressionSet unionChangeAcl = this.m_changeAcl == null ? operand.m_changeAcl : this.m_changeAcl.Union( operand.m_changeAcl );
 
            if ((unionRead == null || unionRead.IsEmpty()) && 
                (unionWrite == null || unionWrite.IsEmpty()) &&
                (unionCreate == null || unionCreate.IsEmpty()) && 
                (unionViewAcl == null || unionViewAcl.IsEmpty()) &&
                (unionChangeAcl == null || unionChangeAcl.IsEmpty()))
            {
                return null; 
            }
 
            RegistryPermission unionPermission = new RegistryPermission(PermissionState.None); 
            unionPermission.m_unrestricted = false;
            unionPermission.m_read = unionRead; 
            unionPermission.m_write = unionWrite;
            unionPermission.m_create = unionCreate;
            unionPermission.m_viewAcl = unionViewAcl;
            unionPermission.m_changeAcl = unionChangeAcl; 

            return unionPermission; 
        } 

 
        public override IPermission Copy()
        {
            RegistryPermission copy = new RegistryPermission(PermissionState.None);
            if (this.m_unrestricted) 
            {
                copy.m_unrestricted = true; 
            } 
            else
            { 
                copy.m_unrestricted = false;
                if (this.m_read != null)
                {
                    copy.m_read = this.m_read.Copy(); 
                }
                if (this.m_write != null) 
                { 
                    copy.m_write = this.m_write.Copy();
                } 
                if (this.m_create != null)
                {
                    copy.m_create = this.m_create.Copy();
                } 
                if (this.m_viewAcl != null)
                { 
                    copy.m_viewAcl = this.m_viewAcl.Copy(); 
                }
                if (this.m_changeAcl != null) 
                {
                    copy.m_changeAcl = this.m_changeAcl.Copy();
                }
            } 
            return copy;
        } 
 
        public override SecurityElement ToXml()
        { 
            SecurityElement esd = CodeAccessPermission.CreatePermissionElement( this, "System.Security.Permissions.RegistryPermission" );
            if (!IsUnrestricted())
            {
                if (this.m_read != null && !this.m_read.IsEmpty()) 
                {
                    esd.AddAttribute( "Read", SecurityElement.Escape( m_read.ToString() ) ); 
                } 
                if (this.m_write != null && !this.m_write.IsEmpty())
                { 
                    esd.AddAttribute( "Write", SecurityElement.Escape( m_write.ToString() ) );
                }
                if (this.m_create != null && !this.m_create.IsEmpty())
                { 
                    esd.AddAttribute( "Create", SecurityElement.Escape( m_create.ToString() ) );
                } 
                if (this.m_viewAcl != null && !this.m_viewAcl.IsEmpty()) 
                {
                    esd.AddAttribute( "ViewAccessControl", SecurityElement.Escape( m_viewAcl.ToString() ) ); 
                }
                if (this.m_changeAcl != null && !this.m_changeAcl.IsEmpty())
                {
                    esd.AddAttribute( "ChangeAccessControl", SecurityElement.Escape( m_changeAcl.ToString() ) ); 
                }
            } 
            else 
            {
                esd.AddAttribute( "Unrestricted", "true" ); 
            }
            return esd;
        }
 
        public override void FromXml(SecurityElement esd)
        { 
            CodeAccessPermission.ValidateElement( esd, this ); 
            String et;
 
            if (XMLUtil.IsUnrestricted( esd ))
            {
                m_unrestricted = true;
                return; 
            }
 
            m_unrestricted = false; 
            m_read = null;
            m_write = null; 
            m_create = null;
            m_viewAcl = null;
            m_changeAcl = null;
 
            et = esd.Attribute( "Read" );
            if (et != null) 
            { 
                m_read = new StringExpressionSet( et );
            } 

            et = esd.Attribute( "Write" );
            if (et != null)
            { 
                m_write = new StringExpressionSet( et );
            } 
 
            et = esd.Attribute( "Create" );
            if (et != null) 
            {
                m_create = new StringExpressionSet( et );
            }
 
            et = esd.Attribute( "ViewAccessControl" );
            if (et != null) 
            { 
                m_viewAcl = new StringExpressionSet( et );
            } 

            et = esd.Attribute( "ChangeAccessControl" );
            if (et != null)
            { 
                m_changeAcl = new StringExpressionSet( et );
            } 
        } 

        ///  
        int IBuiltInPermission.GetTokenIndex()
        {
            return RegistryPermission.GetTokenIndex();
        } 

        internal static int GetTokenIndex() 
        { 
            return BuiltInPermissionIndex.RegistryPermissionIndex;
        } 

    }

}

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