MutexSecurity.cs source code in C# .NET

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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / AccessControl / MutexSecurity.cs / 1 / MutexSecurity.cs

                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  MutexSecurity 
**
** 
** Purpose: Managed ACL wrapper for Win32 mutexes.
**
**
===========================================================*/ 

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

    // In order to call ReleaseMutex, you must have an ACL granting you
    // MUTEX_MODIFY_STATE rights (0x0001).  The other interesting value 
    // in a Mutex's ACL is MUTEX_ALL_ACCESS (0x1F0001).
    // You need SYNCHRONIZE to be able to open a handle to a mutex. 
    [Flags] 
    public enum MutexRights
    { 
        Modify               = 0x000001,
        Delete               = 0x010000,
        ReadPermissions      = 0x020000,
        ChangePermissions    = 0x040000, 
        TakeOwnership        = 0x080000,
        Synchronize          = 0x100000,  // SYNCHRONIZE 
        FullControl          = 0x1F0001 
    }
 

    public sealed class MutexAccessRule : AccessRule
    {
        // Constructor for creating access rules for registry objects 

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

        public MutexAccessRule(String identity, MutexRights 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 MutexAccessRule(
            IdentityReference identity,
            int accessMask, 
            bool isInherited,
            InheritanceFlags inheritanceFlags, 
            PropagationFlags propagationFlags, 
            AccessControlType type )
            : base( 
                identity,
                accessMask,
                isInherited,
                inheritanceFlags, 
                propagationFlags,
                type ) 
        { 
        }
 
        public MutexRights MutexRights {
            get { return (MutexRights) base.AccessMask; }
        }
    } 

 
    public sealed class MutexAuditRule : AuditRule 
    {
        public MutexAuditRule(IdentityReference identity, MutexRights eventRights, AuditFlags flags) 
            : this(identity, (int) eventRights, false, InheritanceFlags.None, PropagationFlags.None, flags)
        {
        }
 
        /*  // Not in the spec
        public MutexAuditRule(string identity, MutexRights eventRights, AuditFlags flags) 
            : this(new NTAccount(identity), (int) eventRights, false, InheritanceFlags.None, PropagationFlags.None, flags) 
        {
        } 
        */

        internal MutexAuditRule(IdentityReference identity, int accessMask, bool isInherited, InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AuditFlags flags)
            : base(identity, accessMask, isInherited, inheritanceFlags, propagationFlags, flags) 
        {
        } 
 
        public MutexRights MutexRights {
            get { return (MutexRights) base.AccessMask; } 
        }
    }

 
    public sealed class MutexSecurity : NativeObjectSecurity
    { 
        public MutexSecurity() 
            : base(true, ResourceType.KernelObject)
        { 
        }

        public MutexSecurity(String name, AccessControlSections includeSections)
            : base(true, ResourceType.KernelObject, name, includeSections, _HandleErrorCode, null) 
        {
            // Let the underlying ACL API's demand unmanaged code permission. 
        } 

        internal MutexSecurity(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 Win32Native.ERROR_INVALID_NAME:
            case Win32Native.ERROR_INVALID_HANDLE:
            case Win32Native.ERROR_FILE_NOT_FOUND: 
                if ((name != null) && (name.Length != 0))
                    exception = new WaitHandleCannotBeOpenedException(Environment.GetResourceString("Threading.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 MutexAccessRule(identityReference, accessMask, isInherited, inheritanceFlags, propagationFlags, type);
        }
 
        public override AuditRule AuditRuleFactory(IdentityReference identityReference, int accessMask, bool isInherited, InheritanceFlags inheritanceFlags, PropagationFlags propagationFlags, AuditFlags flags)
        { 
            return new MutexAuditRule(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(MutexAccessRule rule) 
        {
            base.AddAccessRule(rule);
        }
 
        public void SetAccessRule(MutexAccessRule rule)
        { 
            base.SetAccessRule(rule); 
        }
 
        public void ResetAccessRule(MutexAccessRule rule)
        {
            base.ResetAccessRule(rule);
        } 

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

        public void RemoveAccessRuleAll(MutexAccessRule rule)
        {
            base.RemoveAccessRuleAll(rule); 
        }
 
        public void RemoveAccessRuleSpecific(MutexAccessRule rule) 
        {
            base.RemoveAccessRuleSpecific(rule); 
        }

        public void AddAuditRule(MutexAuditRule rule)
        { 
            base.AddAuditRule(rule);
        } 
 
        public void SetAuditRule(MutexAuditRule rule)
        { 
            base.SetAuditRule(rule);
        }

        public bool RemoveAuditRule(MutexAuditRule rule) 
        {
            return base.RemoveAuditRule(rule); 
        } 

        public void RemoveAuditRuleAll(MutexAuditRule rule) 
        {
            base.RemoveAuditRuleAll(rule);
        }
 
        public void RemoveAuditRuleSpecific(MutexAuditRule rule)
        { 
            base.RemoveAuditRuleSpecific(rule); 
        }
 
        public override Type AccessRightType
        {
            get { return typeof(MutexRights); }
        } 

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

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

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