SemaphoreSecurity.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Sys / System / Security / AccessControl / SemaphoreSecurity.cs / 1 / SemaphoreSecurity.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  SemaphoreSecurity 
**
** Purpose: Managed ACL wrapper for Win32 semaphores. 
**
** Date:  November 26, 2003
**
===========================================================*/ 

using System; 
using System.Collections; 
using System.Security.Permissions;
using System.Security.Principal; 
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;
using System.Runtime.InteropServices;
using System.IO; 
using System.Threading;
 
namespace System.Security.AccessControl 
{
    // Derive this list of values from winnt.h and MSDN docs: 
    // http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/synchronization_object_security_and_access_rights.asp

    // Win32's interesting values are SEMAPHORE_MODIFY_STATE (0x2) and
    // SEMAPHORE_ALL_ACCESS (0x1F0003).  I don't know what 0x1 is. 
    [Flags, ComVisible(false)]
    public enum SemaphoreRights 
    { 
        Modify               = 0x000002,
        Delete               = 0x010000, 
        ReadPermissions      = 0x020000,
        ChangePermissions    = 0x040000,
        TakeOwnership        = 0x080000,
        Synchronize          = 0x100000,  // SYNCHRONIZE 
        FullControl          = 0x1F0003
    } 
 
    [ComVisible(false)]
    public sealed class SemaphoreAccessRule : AccessRule 
    {
        // Constructor for creating access rules for registry objects

        public SemaphoreAccessRule(IdentityReference identity, SemaphoreRights eventRights, AccessControlType type) 
            : this(identity, (int) eventRights, false, InheritanceFlags.None, PropagationFlags.None, type)
        { 
        } 

        public SemaphoreAccessRule(String identity, SemaphoreRights eventRights, AccessControlType type) 
            : this(new NTAccount(identity), (int) eventRights, false, InheritanceFlags.None, PropagationFlags.None, type)
        {
        }
 
        //
        // Internal constructor to be called by public constructors 
        // and the access rule factory methods of {File|Folder}Security 
        //
        internal SemaphoreAccessRule( 
            IdentityReference identity,
            int accessMask,
            bool isInherited,
            InheritanceFlags inheritanceFlags, 
            PropagationFlags propagationFlags,
            AccessControlType type ) 
            : base( 
                identity,
                accessMask, 
                isInherited,
                inheritanceFlags,
                propagationFlags,
                type ) 
        {
        } 
 
        public SemaphoreRights SemaphoreRights {
            get { return (SemaphoreRights) base.AccessMask; } 
        }
    }

    [ComVisible(false)] 
    public sealed class SemaphoreAuditRule : AuditRule
    { 
        public SemaphoreAuditRule(IdentityReference identity, SemaphoreRights eventRights, AuditFlags flags) 
            : this(identity, (int) eventRights, false, InheritanceFlags.None, PropagationFlags.None, flags)
        { 
        }

        /*  // Not in the spec
        public SemaphoreAuditRule(string identity, SemaphoreRights eventRights, AuditFlags flags) 
            : this(new NTAccount(identity), (int) eventRights, false, InheritanceFlags.None, PropagationFlags.None, flags)
        { 
        } 
        */
 
        internal SemaphoreAuditRule(IdentityReference identity, int accessMask, bool isInherited, InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AuditFlags flags)
            : base(identity, accessMask, isInherited, inheritanceFlags, propagationFlags, flags)
        {
        } 

        public SemaphoreRights SemaphoreRights { 
            get { return (SemaphoreRights) base.AccessMask; } 
        }
    } 

    [ComVisible(false)]
    public sealed class SemaphoreSecurity : NativeObjectSecurity
    { 
        public SemaphoreSecurity()
            : base(true, ResourceType.KernelObject) 
        { 
        }
 
        public SemaphoreSecurity(String name, AccessControlSections includeSections)
            : base(true, ResourceType.KernelObject, name, includeSections, _HandleErrorCode, null)
        {
            // Let the underlying ACL API's demand unmanaged code permission. 
        }
 
        internal SemaphoreSecurity(SafeWaitHandle handle, AccessControlSections includeSections) 
            : base(true, ResourceType.KernelObject, handle, includeSections, _HandleErrorCode, null)
        { 
            // Let the underlying ACL API's demand unmanaged code permission.
        }

        private static Exception _HandleErrorCode(int errorCode, string name, SafeHandle handle, object context) 
        {
            System.Exception exception = null; 
 
            switch (errorCode) {
            case NativeMethods.ERROR_INVALID_NAME: 
            case NativeMethods.ERROR_INVALID_HANDLE:
            case NativeMethods.ERROR_FILE_NOT_FOUND:
                if ((name != null) && (name.Length != 0))
                    exception = new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle, name)); 
                else
                    exception = new WaitHandleCannotBeOpenedException(); 
                break; 

            default: 
                break;
            }

            return exception; 
        }
 
        public override AccessRule AccessRuleFactory(IdentityReference identityReference, int accessMask, bool isInherited, InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AccessControlType type) 
        {
            return new SemaphoreAccessRule(identityReference, accessMask, isInherited, inheritanceFlags, propagationFlags, type); 
        }

        public override AuditRule AuditRuleFactory(IdentityReference identityReference, int accessMask, bool isInherited, InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AuditFlags flags)
        { 
            return new SemaphoreAuditRule(identityReference, accessMask, isInherited, inheritanceFlags, propagationFlags, flags);
        } 
 
        internal AccessControlSections GetAccessControlSectionsFromChanges()
        { 
            AccessControlSections persistRules = AccessControlSections.None;
            if (AccessRulesModified)
                persistRules = AccessControlSections.Access;
            if (AuditRulesModified) 
                persistRules |= AccessControlSections.Audit;
            if (OwnerModified) 
                persistRules |= AccessControlSections.Owner; 
            if (GroupModified)
                persistRules |= AccessControlSections.Group; 
            return persistRules;
        }

        internal void Persist(SafeWaitHandle handle) 
        {
            // Let the underlying ACL API's demand unmanaged code. 
 
            WriteLock();
 
            try
            {
                AccessControlSections persistSections = GetAccessControlSectionsFromChanges();
                if (persistSections == AccessControlSections.None) 
                    return;  // Don't need to persist anything.
 
                base.Persist(handle, persistSections); 
                OwnerModified = GroupModified = AuditRulesModified = AccessRulesModified = false;
            } 
            finally
            {
                WriteUnlock();
            } 
        }
 
        public void AddAccessRule(SemaphoreAccessRule rule) 
        {
            base.AddAccessRule(rule); 
        }

        public void SetAccessRule(SemaphoreAccessRule rule)
        { 
            base.SetAccessRule(rule);
        } 
 
        public void ResetAccessRule(SemaphoreAccessRule rule)
        { 
            base.ResetAccessRule(rule);
        }

        public bool RemoveAccessRule(SemaphoreAccessRule rule) 
        {
            return base.RemoveAccessRule(rule); 
        } 

        public void RemoveAccessRuleAll(SemaphoreAccessRule rule) 
        {
            base.RemoveAccessRuleAll(rule);
        }
 
        public void RemoveAccessRuleSpecific(SemaphoreAccessRule rule)
        { 
            base.RemoveAccessRuleSpecific(rule); 
        }
 
        public void AddAuditRule(SemaphoreAuditRule rule)
        {
            base.AddAuditRule(rule);
        } 

        public void SetAuditRule(SemaphoreAuditRule rule) 
        { 
            base.SetAuditRule(rule);
        } 

        public bool RemoveAuditRule(SemaphoreAuditRule rule)
        {
            return base.RemoveAuditRule(rule); 
        }
 
        public void RemoveAuditRuleAll(SemaphoreAuditRule rule) 
        {
            base.RemoveAuditRuleAll(rule); 
        }

        public void RemoveAuditRuleSpecific(SemaphoreAuditRule rule)
        { 
            base.RemoveAuditRuleSpecific(rule);
        } 
 
        public override Type AccessRightType
        { 
            get { return typeof(SemaphoreRights); }
        }

        public override Type AccessRuleType 
        {
            get { return typeof(SemaphoreAccessRule); } 
        } 

        public override Type AuditRuleType 
        {
            get { return typeof(SemaphoreAuditRule); }
        }
    } 
}
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