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MutexSecurity.cs
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MutexSecurity.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
/*============================================================
**
**
**
** Purpose: Managed ACL wrapper for Win32 mutexes.
**
**
===========================================================*/
using System;
using System.Collections;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Threading;
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;
namespace System.Security.AccessControl
{
// Derive this list of values from winnt.h and MSDN docs:
// https://docs.microsoft.com/en-us/windows/desktop/sync/synchronization-object-security-and-access-rights
// 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)
{
}
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 Interop.Errors.ERROR_INVALID_NAME:
case Interop.Errors.ERROR_INVALID_HANDLE:
case Interop.Errors.ERROR_FILE_NOT_FOUND:
if ((name != null) && (name.Length != 0))
exception = new WaitHandleCannotBeOpenedException(SR.Format(SR.WaitHandleCannotBeOpenedException_InvalidHandle, name));
else
exception = new WaitHandleCannotBeOpenedException();
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); }
}
}
}