SemaphoreAccessRule 类

定义

public ref class SemaphoreAccessRule sealed : System::Security::AccessControl::AccessRule

public sealed class SemaphoreAccessRule : System.Security.AccessControl.AccessRule

[System.Security.SecurityCritical]
public sealed class SemaphoreAccessRule : System.Security.AccessControl.AccessRule

[System.Runtime.InteropServices.ComVisible(false)]
public sealed class SemaphoreAccessRule : System.Security.AccessControl.AccessRule

type SemaphoreAccessRule = class
    inherit AccessRule

[<System.Security.SecurityCritical>]
type SemaphoreAccessRule = class
    inherit AccessRule

[<System.Runtime.InteropServices.ComVisible(false)>]
type SemaphoreAccessRule = class
    inherit AccessRule

Public NotInheritable Class SemaphoreAccessRule
Inherits AccessRule

继承

Object

AuthorizationRule

AccessRule

SemaphoreAccessRule

属性

SecurityCriticalAttribute ComVisibleAttribute

示例

下面的代码示例演示了规则和Deny规则之间的Allow分离，并演示了兼容规则中权限的组合。 该示例创建一个 SemaphoreSecurity 对象，添加允许和拒绝当前用户的各种权限的规则，并显示生成的规则对。 然后，该示例为当前用户允许新权限并显示结果，显示新权限与现有 Allow 规则合并。

using System;
using System.Threading;
using System.Security.AccessControl;
using System.Security.Principal;

public class Example
{
    public static void Main()
    {
        // Create a string representing the current user.
        string user = Environment.UserDomainName + "\\" + 
            Environment.UserName;

        // Create a security object that grants no access.
        SemaphoreSecurity mSec = new SemaphoreSecurity();

        // Add a rule that grants the current user the 
        // right to enter or release the semaphore.
        SemaphoreAccessRule rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.Synchronize | SemaphoreRights.Modify, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        // Add a rule that denies the current user the 
        // right to change permissions on the semaphore.
        rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.ChangePermissions, 
            AccessControlType.Deny);
        mSec.AddAccessRule(rule);

        // Display the rules in the security object.
        ShowSecurity(mSec);

        // Add a rule that allows the current user the 
        // right to read permissions on the semaphore. This rule
        // is merged with the existing Allow rule.
        rule = new SemaphoreAccessRule(user, 
            SemaphoreRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        ShowSecurity(mSec);
    }

    private static void ShowSecurity(SemaphoreSecurity security)
    {
        Console.WriteLine("\r\nCurrent access rules:\r\n");

        foreach(SemaphoreAccessRule ar in 
            security.GetAccessRules(true, true, typeof(NTAccount)))
        {
            Console.WriteLine("        User: {0}", ar.IdentityReference);
            Console.WriteLine("        Type: {0}", ar.AccessControlType);
            Console.WriteLine("      Rights: {0}", ar.SemaphoreRights);
            Console.WriteLine();
        }
    }
}

/*This code example produces output similar to following:

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, Synchronize


Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, ReadPermissions, Synchronize
 */

Imports System.Threading
Imports System.Security.AccessControl
Imports System.Security.Principal

Public Class Example

    Public Shared Sub Main()

        ' Create a string representing the current user.
        Dim user As String = Environment.UserDomainName _ 
            & "\" & Environment.UserName

        ' Create a security object that grants no access.
        Dim mSec As New SemaphoreSecurity()

        ' Add a rule that grants the current user the 
        ' right to enter or release the semaphore.
        Dim rule As New SemaphoreAccessRule(user, _
            SemaphoreRights.Synchronize _
            Or SemaphoreRights.Modify, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ' Add a rule that denies the current user the 
        ' right to change permissions on the semaphore.
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.ChangePermissions, _
            AccessControlType.Deny)
        mSec.AddAccessRule(rule)

        ' Display the rules in the security object.
        ShowSecurity(mSec)

        ' Add a rule that allows the current user the 
        ' right to read permissions on the semaphore. This 
        ' rule is merged with the existing Allow rule.
        rule = New SemaphoreAccessRule(user, _
            SemaphoreRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ShowSecurity(mSec)

    End Sub 

    Private Shared Sub ShowSecurity(ByVal security As SemaphoreSecurity)
        Console.WriteLine(vbCrLf & "Current access rules:" & vbCrLf)

        For Each ar As SemaphoreAccessRule In _
            security.GetAccessRules(True, True, GetType(NTAccount))

            Console.WriteLine("        User: {0}", ar.IdentityReference)
            Console.WriteLine("        Type: {0}", ar.AccessControlType)
            Console.WriteLine("      Rights: {0}", ar.SemaphoreRights)
            Console.WriteLine()
        Next

    End Sub
End Class 

'This code example produces output similar to following:
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, Synchronize
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, ReadPermissions, Synchronize

注解

类SemaphoreAccessRule是.NET Framework提供的一组类之一，用于管理命名系统信号灯上的 Windows 访问控制安全性。 有关这些类及其与基础 Windows 访问控制结构的关系的概述，请参阅 SemaphoreSecurity。

若要获取当前应用于命名信号量的规则列表，请使用 Semaphore.GetAccessControl 方法获取 SemaphoreSecurity 对象，然后使用其 GetAccessRules 方法获取对象的集合 SemaphoreAccessRule 。

SemaphoreAccessRule 对象不会在基础自由访问控制列表中映射具有访问控制条目的一对一 (DACL) 。 获取信号灯的所有访问规则集时，该集包含当前表示所有访问控制条目所需的最小规则数。

使用 SemaphoreAccessRule 对象指定允许或拒绝用户或组的访问权限。 对象 SemaphoreAccessRule 始终表示允许的访问或拒绝的访问，从不同时表示这两者。

若要将规则应用于命名系统信号量，请使用 Semaphore.GetAccessControl 方法获取 SemaphoreSecurity 对象。 SemaphoreSecurity通过使用对象的方法添加规则来修改对象，然后使用 Semaphore.SetAccessControl 方法重新附加安全对象。

SemaphoreAccessRule 对象是不可变的。 信号灯的安全性是使用 类的 方法来添加或删除规则的 SemaphoreSecurity ;执行此操作时，会修改基础访问控制条目。

另请参阅

• SemaphoreSecurity