Semaphore.GetAccessControl 메서드
정의
중요
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명명된 시스템 세마포에 대한 액세스 제어 보안을 가져옵니다.
public:
System::Security::AccessControl::SemaphoreSecurity ^ GetAccessControl();public System.Security.AccessControl.SemaphoreSecurity GetAccessControl ();member this.GetAccessControl : unit -> System.Security.AccessControl.SemaphoreSecurityPublic Function GetAccessControl () As SemaphoreSecurity반환
명명된 시스템 세마포에 대한 액세스 제어 보안을 나타내는 SemaphoreSecurity 개체입니다.
예외
현재 Semaphore 개체가 명명된 시스템 세마포를 나타내며 사용자에게 ReadPermissions 권한이 없는 경우
또는 현재 Semaphore 개체가 명명된 시스템 세마포를 나타내며 ReadPermissions 권한으로 열리지 않은 경우
예제
다음 코드 예제에서는 액세스 제어 보안을 사용하여 명명된 세마포의 교차 프로세스 동작을 보여 줍니다. 이 예제에서는 메서드 오버로드를 사용하여 OpenExisting(String) 명명된 세마포가 있는지 테스트합니다.
세마포가 없으면 최대 개수 2개와 현재 사용자에게 세마포 사용 권한을 거부하지만 세마포에 대한 읽기 및 변경 권한을 부여하는 액세스 제어 보안으로 생성됩니다.
두 명령 창에서 컴파일된 예제를 실행하는 경우 두 번째 복사본은 메서드 호출에 대한 액세스 위반 예외를 OpenExisting(String) throw합니다. 예외가 catch되고, 이 예제에서는 메서드 오버로드를 사용하여 OpenExisting(String, SemaphoreRights) 사용 권한을 읽고 변경하는 데 필요한 권한으로 세마포를 엽니다. 시스템 세마포에 대한 액세스 제어 보안은 메서드를 사용하여 GetAccessControl 가져옵니다.
사용 권한이 변경되면 세마포가 열리고 입력 및 해제에 필요한 권한이 있습니다. 세 번째 명령 창에서 컴파일된 예제를 실행하면 새 권한을 사용하여 실행됩니다.
#using <System.dll>
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^ semaphoreName = L"SemaphoreExample5";
Semaphore^ sem = nullptr;
bool doesNotExist = false;
bool unauthorized = false;
// Attempt to open the named semaphore.
try
{
// Open the semaphore with (SemaphoreRights.Synchronize
// | SemaphoreRights.Modify), to enter and release the
// named semaphore.
//
sem = Semaphore::OpenExisting( semaphoreName );
}
catch ( WaitHandleCannotBeOpenedException^ ex )
{
Console::WriteLine( L"Semaphore does not exist." );
doesNotExist = true;
}
catch ( UnauthorizedAccessException^ ex )
{
Console::WriteLine( L"Unauthorized access: {0}", ex->Message );
unauthorized = true;
}
// There are three cases: (1) The semaphore does not exist.
// (2) The semaphore exists, but the current user doesn't
// have access. (3) The semaphore exists and the user has
// access.
//
if ( doesNotExist )
{
// The semaphore does not exist, so create it.
//
// The value of this variable is set by the semaphore
// constructor. It is true if the named system semaphore was
// created, and false if the named semaphore already existed.
//
bool semaphoreWasCreated;
// Create an access control list (ACL) that denies the
// current user the right to enter or release the
// semaphore, but allows the right to read and change
// security information for the semaphore.
//
String^ user = String::Concat( Environment::UserDomainName,
L"\\", Environment::UserName );
SemaphoreSecurity^ semSec = gcnew SemaphoreSecurity;
SemaphoreAccessRule^ rule = gcnew SemaphoreAccessRule( user,
static_cast<SemaphoreRights>(
SemaphoreRights::Synchronize |
SemaphoreRights::Modify ),
AccessControlType::Deny );
semSec->AddAccessRule( rule );
rule = gcnew SemaphoreAccessRule( user,
static_cast<SemaphoreRights>(
SemaphoreRights::ReadPermissions |
SemaphoreRights::ChangePermissions ),
AccessControlType::Allow );
semSec->AddAccessRule( rule );
// Create a Semaphore object that represents the system
// semaphore named by the constant 'semaphoreName', with
// maximum count three, initial count three, and the
// specified security access. The Boolean value that
// indicates creation of the underlying system object is
// placed in semaphoreWasCreated.
//
sem = gcnew Semaphore( 3,3,semaphoreName,semaphoreWasCreated,semSec );
// If the named system semaphore was created, it can be
// used by the current instance of this program, even
// though the current user is denied access. The current
// program enters the semaphore. Otherwise, exit the
// program.
//
if ( semaphoreWasCreated )
{
Console::WriteLine( L"Created the semaphore." );
}
else
{
Console::WriteLine( L"Unable to create the semaphore." );
return;
}
}
else if ( unauthorized )
{
// Open the semaphore to read and change the access
// control security. The access control security defined
// above allows the current user to do this.
//
try
{
sem = Semaphore::OpenExisting( semaphoreName,
static_cast<SemaphoreRights>(
SemaphoreRights::ReadPermissions |
SemaphoreRights::ChangePermissions ));
// Get the current ACL. This requires
// SemaphoreRights.ReadPermissions.
SemaphoreSecurity^ semSec = sem->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 semaphore must
// be removed.
SemaphoreAccessRule^ rule = gcnew SemaphoreAccessRule( user,
static_cast<SemaphoreRights>(
SemaphoreRights::Synchronize |
SemaphoreRights::Modify ),
AccessControlType::Deny );
semSec->RemoveAccessRule( rule );
// Now grant the user the correct rights.
//
rule = gcnew SemaphoreAccessRule( user,
static_cast<SemaphoreRights>(
SemaphoreRights::Synchronize |
SemaphoreRights::Modify ),
AccessControlType::Allow );
semSec->AddAccessRule( rule );
// Update the ACL. This requires
// SemaphoreRights.ChangePermissions.
sem->SetAccessControl( semSec );
Console::WriteLine( L"Updated semaphore security." );
// Open the semaphore with (SemaphoreRights.Synchronize
// | SemaphoreRights.Modify), the rights required to
// enter and release the semaphore.
//
sem = Semaphore::OpenExisting( semaphoreName );
}
catch ( UnauthorizedAccessException^ ex )
{
Console::WriteLine( L"Unable to change permissions: {0}", ex->Message );
return;
}
}
// Enter the semaphore, and hold it until the program
// exits.
//
try
{
sem->WaitOne();
Console::WriteLine( L"Entered the semaphore." );
Console::WriteLine( L"Press the Enter key to exit." );
Console::ReadLine();
sem->Release();
}
catch ( UnauthorizedAccessException^ ex )
{
Console::WriteLine( L"Unauthorized access: {0}", ex->Message );
}
}
};
using System;
using System.Threading;
using System.Security.AccessControl;
internal class Example
{
internal static void Main()
{
const string semaphoreName = "SemaphoreExample5";
Semaphore sem = null;
bool doesNotExist = false;
bool unauthorized = false;
// Attempt to open the named semaphore.
try
{
// Open the semaphore with (SemaphoreRights.Synchronize
// | SemaphoreRights.Modify), to enter and release the
// named semaphore.
//
sem = Semaphore.OpenExisting(semaphoreName);
}
catch(WaitHandleCannotBeOpenedException)
{
Console.WriteLine("Semaphore does not exist.");
doesNotExist = true;
}
catch(UnauthorizedAccessException ex)
{
Console.WriteLine("Unauthorized access: {0}", ex.Message);
unauthorized = true;
}
// There are three cases: (1) The semaphore does not exist.
// (2) The semaphore exists, but the current user doesn't
// have access. (3) The semaphore exists and the user has
// access.
//
if (doesNotExist)
{
// The semaphore does not exist, so create it.
//
// The value of this variable is set by the semaphore
// constructor. It is true if the named system semaphore was
// created, and false if the named semaphore already existed.
//
bool semaphoreWasCreated;
// Create an access control list (ACL) that denies the
// current user the right to enter or release the
// semaphore, but allows the right to read and change
// security information for the semaphore.
//
string user = Environment.UserDomainName + "\\"
+ Environment.UserName;
SemaphoreSecurity semSec = new SemaphoreSecurity();
SemaphoreAccessRule rule = new SemaphoreAccessRule(
user,
SemaphoreRights.Synchronize | SemaphoreRights.Modify,
AccessControlType.Deny);
semSec.AddAccessRule(rule);
rule = new SemaphoreAccessRule(
user,
SemaphoreRights.ReadPermissions | SemaphoreRights.ChangePermissions,
AccessControlType.Allow);
semSec.AddAccessRule(rule);
// Create a Semaphore object that represents the system
// semaphore named by the constant 'semaphoreName', with
// maximum count three, initial count three, and the
// specified security access. The Boolean value that
// indicates creation of the underlying system object is
// placed in semaphoreWasCreated.
//
sem = new Semaphore(3, 3, semaphoreName,
out semaphoreWasCreated, semSec);
// If the named system semaphore was created, it can be
// used by the current instance of this program, even
// though the current user is denied access. The current
// program enters the semaphore. Otherwise, exit the
// program.
//
if (semaphoreWasCreated)
{
Console.WriteLine("Created the semaphore.");
}
else
{
Console.WriteLine("Unable to create the semaphore.");
return;
}
}
else if (unauthorized)
{
// Open the semaphore to read and change the access
// control security. The access control security defined
// above allows the current user to do this.
//
try
{
sem = Semaphore.OpenExisting(
semaphoreName,
SemaphoreRights.ReadPermissions
| SemaphoreRights.ChangePermissions);
// Get the current ACL. This requires
// SemaphoreRights.ReadPermissions.
SemaphoreSecurity semSec = sem.GetAccessControl();
string user = Environment.UserDomainName + "\\"
+ Environment.UserName;
// First, the rule that denied the current user
// the right to enter and release the semaphore must
// be removed.
SemaphoreAccessRule rule = new SemaphoreAccessRule(
user,
SemaphoreRights.Synchronize | SemaphoreRights.Modify,
AccessControlType.Deny);
semSec.RemoveAccessRule(rule);
// Now grant the user the correct rights.
//
rule = new SemaphoreAccessRule(user,
SemaphoreRights.Synchronize | SemaphoreRights.Modify,
AccessControlType.Allow);
semSec.AddAccessRule(rule);
// Update the ACL. This requires
// SemaphoreRights.ChangePermissions.
sem.SetAccessControl(semSec);
Console.WriteLine("Updated semaphore security.");
// Open the semaphore with (SemaphoreRights.Synchronize
// | SemaphoreRights.Modify), the rights required to
// enter and release the semaphore.
//
sem = Semaphore.OpenExisting(semaphoreName);
}
catch(UnauthorizedAccessException ex)
{
Console.WriteLine("Unable to change permissions: {0}", ex.Message);
return;
}
}
// Enter the semaphore, and hold it until the program
// exits.
//
try
{
sem.WaitOne();
Console.WriteLine("Entered the semaphore.");
Console.WriteLine("Press the Enter key to exit.");
Console.ReadLine();
sem.Release();
}
catch(UnauthorizedAccessException ex)
{
Console.WriteLine("Unauthorized access: {0}", ex.Message);
}
}
}
Imports System.Threading
Imports System.Security.AccessControl
Friend Class Example
<MTAThread> _
Friend Shared Sub Main()
Const semaphoreName As String = "SemaphoreExample5"
Dim sem As Semaphore = Nothing
Dim doesNotExist as Boolean = False
Dim unauthorized As Boolean = False
' Attempt to open the named semaphore.
Try
' Open the semaphore with (SemaphoreRights.Synchronize
' Or SemaphoreRights.Modify), to enter and release the
' named semaphore.
'
sem = Semaphore.OpenExisting(semaphoreName)
Catch ex As WaitHandleCannotBeOpenedException
Console.WriteLine("Semaphore 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 semaphore does not exist.
' (2) The semaphore exists, but the current user doesn't
' have access. (3) The semaphore exists and the user has
' access.
'
If doesNotExist Then
' The semaphore does not exist, so create it.
'
' The value of this variable is set by the semaphore
' constructor. It is True if the named system semaphore was
' created, and False if the named semaphore already existed.
'
Dim semaphoreWasCreated As Boolean
' Create an access control list (ACL) that denies the
' current user the right to enter or release the
' semaphore, but allows the right to read and change
' security information for the semaphore.
'
Dim user As String = Environment.UserDomainName _
& "\" & Environment.UserName
Dim semSec As New SemaphoreSecurity()
Dim rule As New SemaphoreAccessRule(user, _
SemaphoreRights.Synchronize Or SemaphoreRights.Modify, _
AccessControlType.Deny)
semSec.AddAccessRule(rule)
rule = New SemaphoreAccessRule(user, _
SemaphoreRights.ReadPermissions Or _
SemaphoreRights.ChangePermissions, _
AccessControlType.Allow)
semSec.AddAccessRule(rule)
' Create a Semaphore object that represents the system
' semaphore named by the constant 'semaphoreName', with
' maximum count three, initial count three, and the
' specified security access. The Boolean value that
' indicates creation of the underlying system object is
' placed in semaphoreWasCreated.
'
sem = New Semaphore(3, 3, semaphoreName, _
semaphoreWasCreated, semSec)
' If the named system semaphore was created, it can be
' used by the current instance of this program, even
' though the current user is denied access. The current
' program enters the semaphore. Otherwise, exit the
' program.
'
If semaphoreWasCreated Then
Console.WriteLine("Created the semaphore.")
Else
Console.WriteLine("Unable to create the semaphore.")
Return
End If
ElseIf unauthorized Then
' Open the semaphore to read and change the access
' control security. The access control security defined
' above allows the current user to do this.
'
Try
sem = Semaphore.OpenExisting(semaphoreName, _
SemaphoreRights.ReadPermissions Or _
SemaphoreRights.ChangePermissions)
' Get the current ACL. This requires
' SemaphoreRights.ReadPermissions.
Dim semSec As SemaphoreSecurity = sem.GetAccessControl()
Dim user As String = Environment.UserDomainName _
& "\" & Environment.UserName
' First, the rule that denied the current user
' the right to enter and release the semaphore must
' be removed.
Dim rule As New SemaphoreAccessRule(user, _
SemaphoreRights.Synchronize Or SemaphoreRights.Modify, _
AccessControlType.Deny)
semSec.RemoveAccessRule(rule)
' Now grant the user the correct rights.
'
rule = New SemaphoreAccessRule(user, _
SemaphoreRights.Synchronize Or SemaphoreRights.Modify, _
AccessControlType.Allow)
semSec.AddAccessRule(rule)
' Update the ACL. This requires
' SemaphoreRights.ChangePermissions.
sem.SetAccessControl(semSec)
Console.WriteLine("Updated semaphore security.")
' Open the semaphore with (SemaphoreRights.Synchronize
' Or SemaphoreRights.Modify), the rights required to
' enter and release the semaphore.
'
sem = Semaphore.OpenExisting(semaphoreName)
Catch ex As UnauthorizedAccessException
Console.WriteLine("Unable to change permissions: {0}", _
ex.Message)
Return
End Try
End If
' Enter the semaphore, and hold it until the program
' exits.
'
Try
sem.WaitOne()
Console.WriteLine("Entered the semaphore.")
Console.WriteLine("Press the Enter key to exit.")
Console.ReadLine()
sem.Release()
Catch ex As UnauthorizedAccessException
Console.WriteLine("Unauthorized access: {0}", _
ex.Message)
End Try
End Sub
End Class
설명
이 메서드는 GetAccessControl 다음과 같은 플래그 조합(비트 OR 연산을 사용하여 결합됨)을 사용하여 사용 권한을 검색합니다. AccessControlSections.OwnerAccessControlSections.AccessAccessControlSections.Group
사용자에게 이 메서드를 호출할 수 있는 권한이 있어야 SemaphoreRights.ReadPermissions 하며, 세마포가 권한으로 SemaphoreRights.ReadPermissions 열렸어야 합니다.
로컬 세마포에서 액세스 제어 보안은 관련이 없습니다. 개체가 Semaphore 명명된 시스템 세마포를 나타내지 않으면 이 메서드는 모든 사용자에게 모든 권한을 부여하는 개체를 반환 SemaphoreSecurity 합니다.