Mutex.SetAccessControl(MutexSecurity) Yöntem
Tanım
Önemli
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Adlandırılmış bir sistem mutex'i için erişim denetimi güvenliğini ayarlar.
public:
void SetAccessControl(System::Security::AccessControl::MutexSecurity ^ mutexSecurity);public void SetAccessControl (System.Security.AccessControl.MutexSecurity mutexSecurity);member this.SetAccessControl : System.Security.AccessControl.MutexSecurity -> unitPublic Sub SetAccessControl (mutexSecurity As MutexSecurity)Parametreler
- mutexSecurity
- MutexSecurity
MutexSecurity Adlandırılmış sistem mutex'ine uygulanacak erişim denetimi güvenliğini temsil eden nesne.
Özel durumlar
mutexSecurity, null değeridir.
Kullanıcıda yok ChangePermissions.
-veya- Mutex ile ChangePermissionsaçılmadı.
Geçerli Mutex nesne adlandırılmış bir sistem mutex'ini temsil etmiyor.
Örnekler
Aşağıdaki kod örneği, erişim denetimi güvenliğine sahip adlandırılmış bir mutex'in işlemler arası davranışını gösterir. Örnek, adlandırılmış bir mutex'in varlığını test etmek için yöntem aşırı yüklemesini kullanır OpenExisting(String) .
Mutex yoksa, geçerli kullanıcıya mutex kullanma hakkını reddeden ancak mutex üzerinde okuma ve değiştirme izinleri veren ilk sahiplik ve erişim denetimi güvenliği ile oluşturulur.
Derlenmiş örneği iki komut penceresiyle çalıştırırsanız, ikinci kopya çağrısında OpenExisting(String)bir erişim ihlali özel durumu oluşturur. Özel durum yakalanır ve örnek, ve SetAccessControl yöntemlerini kullanarak izinleri okumak ve değiştirmek için gereken haklarla mutex'i açmak için yöntem aşırı yüklemesini GetAccessControl kullanırOpenExisting(String, MutexRights).
İzinler değiştirildikten sonra, mutex girmek ve serbest bırakmak için gereken haklarla açılır. Derlenmiş örneği üçüncü bir komut penceresinden çalıştırırsanız, yeni izinler kullanılarak çalıştırılır.
using namespace System;
using namespace System::Threading;
using namespace System::Security::AccessControl;
using namespace System::Security::Permissions;
public ref class Example
{
public:
[SecurityPermissionAttribute(SecurityAction::Demand,Flags=SecurityPermissionFlag::UnmanagedCode)]
static void Main()
{
String^ mutexName = L"MutexExample4";
Mutex^ m = nullptr;
bool doesNotExist = false;
bool unauthorized = false;
// The value of this variable is set by the mutex
// constructor. It is true if the named system mutex was
// created, and false if the named mutex already existed.
//
bool mutexWasCreated = false;
// Attempt to open the named mutex.
try
{
// Open the mutex with (MutexRights.Synchronize |
// MutexRights.Modify), to enter and release the
// named mutex.
//
m = Mutex::OpenExisting( mutexName );
}
catch ( WaitHandleCannotBeOpenedException^ )
{
Console::WriteLine( L"Mutex does not exist." );
doesNotExist = true;
}
catch ( UnauthorizedAccessException^ ex )
{
Console::WriteLine( L"Unauthorized access: {0}", ex->Message );
unauthorized = true;
}
// There are three cases: (1) The mutex does not exist.
// (2) The mutex exists, but the current user doesn't
// have access. (3) The mutex exists and the user has
// access.
//
if ( doesNotExist )
{
// The mutex does not exist, so create it.
// Create an access control list (ACL) that denies the
// current user the right to enter or release the
// mutex, but allows the right to read and change
// security information for the mutex.
//
String^ user = String::Concat( Environment::UserDomainName, L"\\",
Environment::UserName );
MutexSecurity^ mSec = gcnew MutexSecurity;
MutexAccessRule^ rule = gcnew MutexAccessRule( user,
static_cast<MutexRights>(
MutexRights::Synchronize |
MutexRights::Modify),
AccessControlType::Deny );
mSec->AddAccessRule( rule );
rule = gcnew MutexAccessRule( user,
static_cast<MutexRights>(
MutexRights::ReadPermissions |
MutexRights::ChangePermissions),
AccessControlType::Allow );
mSec->AddAccessRule( rule );
// Create a Mutex object that represents the system
// mutex named by the constant 'mutexName', with
// initial ownership for this thread, and with the
// specified security access. The Boolean value that
// indicates creation of the underlying system object
// is placed in mutexWasCreated.
//
m = gcnew Mutex( true,mutexName, mutexWasCreated,mSec );
// If the named system mutex was created, it can be
// used by the current instance of this program, even
// though the current user is denied access. The current
// program owns the mutex. Otherwise, exit the program.
//
if ( mutexWasCreated )
{
Console::WriteLine( L"Created the mutex." );
}
else
{
Console::WriteLine( L"Unable to create the mutex." );
return;
}
}
else if ( unauthorized )
{
// Open the mutex to read and change the access control
// security. The access control security defined above
// allows the current user to do this.
//
try
{
m = Mutex::OpenExisting( mutexName,
static_cast<MutexRights>(
MutexRights::ReadPermissions |
MutexRights::ChangePermissions) );
// Get the current ACL. This requires
// MutexRights.ReadPermissions.
MutexSecurity^ mSec = m->GetAccessControl();
String^ user = String::Concat( Environment::UserDomainName,
L"\\", Environment::UserName );
// First, the rule that denied the current user
// the right to enter and release the mutex must
// be removed.
MutexAccessRule^ rule = gcnew MutexAccessRule( user,
static_cast<MutexRights>(
MutexRights::Synchronize |
MutexRights::Modify),
AccessControlType::Deny );
mSec->RemoveAccessRule( rule );
// Now grant the user the correct rights.
//
rule = gcnew MutexAccessRule( user,
static_cast<MutexRights>(
MutexRights::Synchronize |
MutexRights::Modify),
AccessControlType::Allow );
mSec->AddAccessRule( rule );
// Update the ACL. This requires
// MutexRights.ChangePermissions.
m->SetAccessControl( mSec );
Console::WriteLine( L"Updated mutex security." );
// Open the mutex with (MutexRights.Synchronize
// | MutexRights.Modify), the rights required to
// enter and release the mutex.
//
m = Mutex::OpenExisting( mutexName );
}
catch ( UnauthorizedAccessException^ ex )
{
Console::WriteLine(
L"Unable to change permissions: {0}", ex->Message );
return;
}
}
// If this program created the mutex, it already owns
// the mutex.
//
if ( !mutexWasCreated )
{
// Enter the mutex, and hold it until the program
// exits.
//
try
{
Console::WriteLine( L"Wait for the mutex." );
m->WaitOne();
Console::WriteLine( L"Entered the mutex." );
}
catch ( UnauthorizedAccessException^ ex )
{
Console::WriteLine( L"Unauthorized access: {0}",
ex->Message );
}
}
Console::WriteLine( L"Press the Enter key to exit." );
Console::ReadLine();
m->ReleaseMutex();
m->Dispose();
}
};
int main()
{
Example::Main();
}
using System;
using System.Threading;
using System.Security.AccessControl;
internal class Example
{
internal static void Main()
{
const string mutexName = "MutexExample4";
Mutex m = null;
bool doesNotExist = false;
bool unauthorized = false;
// The value of this variable is set by the mutex
// constructor. It is true if the named system mutex was
// created, and false if the named mutex already existed.
//
bool mutexWasCreated = false;
// Attempt to open the named mutex.
try
{
// Open the mutex with (MutexRights.Synchronize |
// MutexRights.Modify), to enter and release the
// named mutex.
//
m = Mutex.OpenExisting(mutexName);
}
catch(WaitHandleCannotBeOpenedException)
{
Console.WriteLine("Mutex does not exist.");
doesNotExist = true;
}
catch(UnauthorizedAccessException ex)
{
Console.WriteLine("Unauthorized access: {0}", ex.Message);
unauthorized = true;
}
// There are three cases: (1) The mutex does not exist.
// (2) The mutex exists, but the current user doesn't
// have access. (3) The mutex exists and the user has
// access.
//
if (doesNotExist)
{
// The mutex does not exist, so create it.
// Create an access control list (ACL) that denies the
// current user the right to enter or release the
// mutex, but allows the right to read and change
// security information for the mutex.
//
string user = Environment.UserDomainName + "\\"
+ Environment.UserName;
var mSec = new MutexSecurity();
MutexAccessRule rule = new MutexAccessRule(user,
MutexRights.Synchronize | MutexRights.Modify,
AccessControlType.Deny);
mSec.AddAccessRule(rule);
rule = new MutexAccessRule(user,
MutexRights.ReadPermissions | MutexRights.ChangePermissions,
AccessControlType.Allow);
mSec.AddAccessRule(rule);
// Create a Mutex object that represents the system
// mutex named by the constant 'mutexName', with
// initial ownership for this thread, and with the
// specified security access. The Boolean value that
// indicates creation of the underlying system object
// is placed in mutexWasCreated.
//
m = new Mutex(true, mutexName, out mutexWasCreated, mSec);
// If the named system mutex was created, it can be
// used by the current instance of this program, even
// though the current user is denied access. The current
// program owns the mutex. Otherwise, exit the program.
//
if (mutexWasCreated)
{
Console.WriteLine("Created the mutex.");
}
else
{
Console.WriteLine("Unable to create the mutex.");
return;
}
}
else if (unauthorized)
{
// Open the mutex to read and change the access control
// security. The access control security defined above
// allows the current user to do this.
//
try
{
m = Mutex.OpenExisting(mutexName,
MutexRights.ReadPermissions | MutexRights.ChangePermissions);
// Get the current ACL. This requires
// MutexRights.ReadPermissions.
MutexSecurity mSec = m.GetAccessControl();
string user = Environment.UserDomainName + "\\"
+ Environment.UserName;
// First, the rule that denied the current user
// the right to enter and release the mutex must
// be removed.
MutexAccessRule rule = new MutexAccessRule(user,
MutexRights.Synchronize | MutexRights.Modify,
AccessControlType.Deny);
mSec.RemoveAccessRule(rule);
// Now grant the user the correct rights.
//
rule = new MutexAccessRule(user,
MutexRights.Synchronize | MutexRights.Modify,
AccessControlType.Allow);
mSec.AddAccessRule(rule);
// Update the ACL. This requires
// MutexRights.ChangePermissions.
m.SetAccessControl(mSec);
Console.WriteLine("Updated mutex security.");
// Open the mutex with (MutexRights.Synchronize
// | MutexRights.Modify), the rights required to
// enter and release the mutex.
//
m = Mutex.OpenExisting(mutexName);
}
catch(UnauthorizedAccessException ex)
{
Console.WriteLine("Unable to change permissions: {0}",
ex.Message);
return;
}
}
// If this program created the mutex, it already owns
// the mutex.
//
if (!mutexWasCreated)
{
// Enter the mutex, and hold it until the program
// exits.
//
try
{
Console.WriteLine("Wait for the mutex.");
m.WaitOne();
Console.WriteLine("Entered the mutex.");
}
catch(UnauthorizedAccessException ex)
{
Console.WriteLine("Unauthorized access: {0}", ex.Message);
}
}
Console.WriteLine("Press the Enter key to exit.");
Console.ReadLine();
m.ReleaseMutex();
m.Dispose();
}
}
Imports System.Threading
Imports System.Security.AccessControl
Friend Class Example
<MTAThread> _
Friend Shared Sub Main()
Const mutexName As String = "MutexExample4"
Dim m As Mutex = Nothing
Dim doesNotExist as Boolean = False
Dim unauthorized As Boolean = False
' The value of this variable is set by the mutex
' constructor. It is True if the named system mutex was
' created, and False if the named mutex already existed.
'
Dim mutexWasCreated As Boolean
' Attempt to open the named mutex.
Try
' Open the mutex with (MutexRights.Synchronize Or
' MutexRights.Modify), to enter and release the
' named mutex.
'
m = Mutex.OpenExisting(mutexName)
Catch ex As WaitHandleCannotBeOpenedException
Console.WriteLine("Mutex does not exist.")
doesNotExist = True
Catch ex As UnauthorizedAccessException
Console.WriteLine("Unauthorized access: {0}", ex.Message)
unauthorized = True
End Try
' There are three cases: (1) The mutex does not exist.
' (2) The mutex exists, but the current user doesn't
' have access. (3) The mutex exists and the user has
' access.
'
If doesNotExist Then
' The mutex does not exist, so create it.
' Create an access control list (ACL) that denies the
' current user the right to enter or release the
' mutex, but allows the right to read and change
' security information for the mutex.
'
Dim user As String = Environment.UserDomainName _
& "\" & Environment.UserName
Dim mSec As New MutexSecurity()
Dim rule As New MutexAccessRule(user, _
MutexRights.Synchronize Or MutexRights.Modify, _
AccessControlType.Deny)
mSec.AddAccessRule(rule)
rule = New MutexAccessRule(user, _
MutexRights.ReadPermissions Or _
MutexRights.ChangePermissions, _
AccessControlType.Allow)
mSec.AddAccessRule(rule)
' Create a Mutex object that represents the system
' mutex named by the constant 'mutexName', with
' initial ownership for this thread, and with the
' specified security access. The Boolean value that
' indicates creation of the underlying system object
' is placed in mutexWasCreated.
'
m = New Mutex(True, mutexName, mutexWasCreated, mSec)
' If the named system mutex was created, it can be
' used by the current instance of this program, even
' though the current user is denied access. The current
' program owns the mutex. Otherwise, exit the program.
'
If mutexWasCreated Then
Console.WriteLine("Created the mutex.")
Else
Console.WriteLine("Unable to create the mutex.")
Return
End If
ElseIf unauthorized Then
' Open the mutex to read and change the access control
' security. The access control security defined above
' allows the current user to do this.
'
Try
m = Mutex.OpenExisting(mutexName, _
MutexRights.ReadPermissions Or _
MutexRights.ChangePermissions)
' Get the current ACL. This requires
' MutexRights.ReadPermissions.
Dim mSec As MutexSecurity = m.GetAccessControl()
Dim user As String = Environment.UserDomainName _
& "\" & Environment.UserName
' First, the rule that denied the current user
' the right to enter and release the mutex must
' be removed.
Dim rule As New MutexAccessRule(user, _
MutexRights.Synchronize Or MutexRights.Modify, _
AccessControlType.Deny)
mSec.RemoveAccessRule(rule)
' Now grant the user the correct rights.
'
rule = New MutexAccessRule(user, _
MutexRights.Synchronize Or MutexRights.Modify, _
AccessControlType.Allow)
mSec.AddAccessRule(rule)
' Update the ACL. This requires
' MutexRights.ChangePermissions.
m.SetAccessControl(mSec)
Console.WriteLine("Updated mutex security.")
' Open the mutex with (MutexRights.Synchronize
' Or MutexRights.Modify), the rights required to
' enter and release the mutex.
'
m = Mutex.OpenExisting(mutexName)
Catch ex As UnauthorizedAccessException
Console.WriteLine("Unable to change permissions: {0}", _
ex.Message)
Return
End Try
End If
' If this program created the mutex, it already owns
' the mutex.
'
If Not mutexWasCreated Then
' Enter the mutex, and hold it until the program
' exits.
'
Try
Console.WriteLine("Wait for the mutex.")
m.WaitOne()
Console.WriteLine("Entered the mutex.")
Catch ex As UnauthorizedAccessException
Console.WriteLine("Unauthorized access: {0}", _
ex.Message)
End Try
End If
Console.WriteLine("Press the Enter key to exit.")
Console.ReadLine()
m.ReleaseMutex()
m.Dispose()
End Sub
End Class
Açıklamalar
Kullanıcının bu yöntemi çağırma haklarına sahip MutexRights.ChangePermissions olması ve mutex'in ile MutexRights.ChangePermissionsaçılmış olması gerekir.
Not
.NET Core ve .NET 5+ içinde eşdeğer yöntemdir SetAccessControl.