MutexSecurity.RemoveAccessRuleAll(MutexAccessRule) Método

Definição

Namespace:

System.Security.AccessControl

Assembly:

System.Threading.AccessControl.dll

Pesquisa por todas as regras de controle de acesso com o mesmo usuário e AccessControlType (permitir ou negar) como a regra especificada e, se encontradas, remove-as.

public:
 void RemoveAccessRuleAll(System::Security::AccessControl::MutexAccessRule ^ rule);

public void RemoveAccessRuleAll (System.Security.AccessControl.MutexAccessRule rule);

override this.RemoveAccessRuleAll : System.Security.AccessControl.MutexAccessRule -> unit

Public Sub RemoveAccessRuleAll (rule As MutexAccessRule)

Parâmetros

rule

MutexAccessRule

Um MutexAccessRule que especifica o usuário e o AccessControlType pelos quais pesquisar. Todos os direitos especificados por essa regra são ignorados.

Exceções

ArgumentNullException

rule é null.

Exemplos

O exemplo de código a seguir mostra que o RemoveAccessRuleAll método remove todas as regras que correspondem ao usuário e AccessControlType, ignorando direitos.

O exemplo cria um MutexSecurity objeto, adiciona regras que permitem e negam vários direitos para o usuário atual e mescla direitos adicionais à Allow regra. Em seguida, o exemplo cria uma nova regra que permite que o usuário atual assuma a propriedade e usa essa regra para remover a Allow regra do MutexSecurity objeto.

Observação

Este exemplo não anexa o objeto de segurança a um Mutex objeto . Exemplos que anexam objetos de segurança podem ser encontrados em Mutex.GetAccessControl e Mutex.SetAccessControl.

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.
        MutexSecurity mSec = new MutexSecurity();

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

        // Add a rule that denies the current user the 
        // right to change permissions on the mutex.
        rule = new MutexAccessRule(user, 
            MutexRights.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 mutex. This rule
        // is merged with the existing Allow rule.
        rule = new MutexAccessRule(user, 
            MutexRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        ShowSecurity(mSec);

        // Create a rule that allows the current user to
        // change the owner of the mutex, and use that rule 
        // to remove the existing allow access rule from 
        // the MutexSecurity object, showing that the user
        // and access type must match, while the rights are
        // ignored.
        Console.WriteLine("Use RemoveAccessRuleAll to remove the Allow rule.");
        rule = new MutexAccessRule(user, 
            MutexRights.TakeOwnership, 
            AccessControlType.Allow);
        mSec.RemoveAccessRuleAll(rule);

        ShowSecurity(mSec);
    }

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

        foreach(MutexAccessRule 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.MutexRights);
            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

Use RemoveAccessRuleAll to remove the Allow rule.

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions
 */

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 MutexSecurity()

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

        ' Add a rule that denies the current user the 
        ' right to change permissions on the mutex.
        rule = New MutexAccessRule(user, _
            MutexRights.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 mutex. This rule
        ' is merged with the existing Allow rule.
        rule = New MutexAccessRule(user, _
            MutexRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ShowSecurity(mSec)

        ' Create a rule that allows the current user to
        ' change the owner of the mutex, and use that rule 
        ' to remove the existing allow access rule from 
        ' the MutexSecurity object, showing that the user
        ' and access type must match, while the rights are
        ' ignored.
        Console.WriteLine("Use RemoveAccessRuleAll to remove the Allow rule.")
        rule = New MutexAccessRule(user, _
            MutexRights.TakeOwnership, _
            AccessControlType.Allow)
        mSec.RemoveAccessRuleAll(rule)

        ShowSecurity(mSec)
        
    End Sub 

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

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

            Console.WriteLine("        User: {0}", ar.IdentityReference)
            Console.WriteLine("        Type: {0}", ar.AccessControlType)
            Console.WriteLine("      Rights: {0}", ar.MutexRights)
            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
'
'Use RemoveAccessRuleAll to remove the Allow rule.
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions

Comentários

O objeto atual MutexSecurity é pesquisado por regras que têm o mesmo usuário e o mesmo AccessControlType valor que rule. Todos os direitos especificados por rule são ignorados ao executar essa pesquisa. Se nenhuma regra de correspondência for encontrada, nenhuma ação será tomada.