RegistrySecurity.RemoveAccessRuleSpecific(RegistryAccessRule) Metode

Definisi

Ruang nama:

System.Security.AccessControl

Rakitan:

Microsoft.Win32.Registry.dll

Mencari aturan kontrol akses yang sama persis dengan aturan yang ditentukan dan, jika ditemukan, akan menghapusnya.

public:
 void RemoveAccessRuleSpecific(System::Security::AccessControl::RegistryAccessRule ^ rule);

public void RemoveAccessRuleSpecific (System.Security.AccessControl.RegistryAccessRule rule);

override this.RemoveAccessRuleSpecific : System.Security.AccessControl.RegistryAccessRule -> unit

Public Sub RemoveAccessRuleSpecific (rule As RegistryAccessRule)

Parameter

rule

RegistryAccessRule

yang RegistryAccessRule akan dihapus.

Pengecualian

ArgumentNullException

ruleadalah null.

Contoh

Contoh kode berikut menunjukkan bahwa RemoveAccessRuleSpecific metode menghapus aturan hanya jika cocok dengan tepat.

Contohnya membuat dua aturan yang memungkinkan hak yang berbeda. Aturan memiliki bendera pewarisan dan penyebaran yang kompatibel, jadi ketika aturan kedua ditambahkan, aturan tersebut bergabung dengan yang pertama. Contoh memanggil RemoveAccessRuleSpecific metode , menentukan aturan pertama, tetapi karena aturan digabungkan tidak ada aturan yang cocok. Contoh kemudian memanggil RemoveAccessRule metode ke hapus aturan kedua dari aturan gabungan, dan akhirnya memanggil RemoveAccessRuleSpecific metode untuk menghapus aturan pertama.

Catatan

Contoh ini tidak melampirkan objek keamanan ke RegistryKey objek. RegistryKey.GetAccessControl Lihat metode dan RegistryKey.SetAccessControl metode .

using System;
using System.Security.AccessControl;
using System.Security.Principal;
using System.Security;
using Microsoft.Win32;

public class Example
{
    public static void Main()
    {
        string user = Environment.UserDomainName + "\\"
            + Environment.UserName;

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

        // Add a rule that grants the current user the right
        // to read and enumerate the name/value pairs in a key, 
        // to read its access and audit rules, to enumerate
        // its subkeys, to create subkeys, and to delete the key. 
        // The rule is inherited by all contained subkeys.
        //
        RegistryAccessRule rule1 = new RegistryAccessRule(user, 
            RegistryRights.ReadKey | RegistryRights.WriteKey
                | RegistryRights.Delete, 
            InheritanceFlags.ContainerInherit, 
            PropagationFlags.None, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule1);

        // Add a rule that allows the current user the right
        // right to take ownership of a key, using the same 
        // inheritance and propagation flags. This rule 
        // merges with the first rule.
        RegistryAccessRule rule2 = new RegistryAccessRule(user, 
            RegistryRights.ChangePermissions, 
            InheritanceFlags.ContainerInherit,
            PropagationFlags.None, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule2);

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

        // Attempt to use RemoveRuleSpecific to remove the
        // first rule. The removal fails, because the rule
        // in the RegistrySecurity object has been altered.
        mSec.RemoveAccessRuleSpecific(rule1);

        // Show that the rule was not removed.
        ShowSecurity(mSec);

        // Use the RemoveAccessRule method to remove rule2,
        // and then use RemoveAccessRuleSpecific to remove
        // rule1.
        mSec.RemoveAccessRule(rule2);
        mSec.RemoveAccessRuleSpecific(rule1);

        // Show that the rules have been removed.
        ShowSecurity(mSec);
    }

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

        foreach( RegistryAccessRule 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.RegistryRights);
            Console.WriteLine(" Inheritance: {0}", ar.InheritanceFlags);
            Console.WriteLine(" Propagation: {0}", ar.PropagationFlags);
            Console.WriteLine("   Inherited? {0}", ar.IsInherited);
            Console.WriteLine();
        }
    }
}

/* This code example produces output similar to following:

Current access rules:

        User: TestDomain\TestUser
        Type: Allow
      Rights: SetValue, CreateSubKey, Delete, ReadKey, ChangePermissions
 Inheritance: ContainerInherit
 Propagation: None
   Inherited? False


Current access rules:

        User: TestDomain\TestUser
        Type: Allow
      Rights: SetValue, CreateSubKey, Delete, ReadKey, ChangePermissions
 Inheritance: ContainerInherit
 Propagation: None
   Inherited? False


Current access rules:

*/

Option Explicit
Imports System.Security.AccessControl
Imports System.Security.Principal
Imports System.Security
Imports Microsoft.Win32

Public Class Example

    Public Shared Sub Main()

        Dim user As String = Environment.UserDomainName _ 
            & "\" & Environment.UserName

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

        ' Add a rule that grants the current user the right
        ' to read and enumerate the name/value pairs in a key, 
        ' to read its access and audit rules, to enumerate
        ' its subkeys, to create subkeys, and to delete the key. 
        ' The rule is inherited by all contained subkeys.
        '
        Dim rule1 As New RegistryAccessRule(user, _
            RegistryRights.ReadKey Or RegistryRights.WriteKey _
                Or RegistryRights.Delete, _
            InheritanceFlags.ContainerInherit, _
            PropagationFlags.None, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule1)

        ' Add a rule that allows the current user the right
        ' right to take ownership of a key, using the same 
        ' inheritance and propagation flags. This rule 
        ' merges with the first rule.
        Dim rule2 As New RegistryAccessRule(user, _
            RegistryRights.ChangePermissions, _
            InheritanceFlags.ContainerInherit, _
            PropagationFlags.None, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule2)

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

        ' Attempt to use RemoveRuleSpecific to remove the
        ' first rule. The removal fails, because the rule
        ' in the RegistrySecurity object has been altered.
        mSec.RemoveAccessRuleSpecific(rule1)

        ' Show that the rule was not removed.
        ShowSecurity(mSec)

        ' Use the RemoveAccessRule method to remove rule2,
        ' and then use RemoveAccessRuleSpecific to remove
        ' rule1.
        mSec.RemoveAccessRule(rule2)
        mSec.RemoveAccessRuleSpecific(rule1)

        ' Show that the rules have been removed.
        ShowSecurity(mSec)

    End Sub 

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

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

            Console.WriteLine("        User: {0}", ar.IdentityReference)
            Console.WriteLine("        Type: {0}", ar.AccessControlType)
            Console.WriteLine("      Rights: {0}", ar.RegistryRights)
            Console.WriteLine(" Inheritance: {0}", ar.InheritanceFlags)
            Console.WriteLine(" Propagation: {0}", ar.PropagationFlags)
            Console.WriteLine("   Inherited? {0}", ar.IsInherited)
            Console.WriteLine()
        Next

    End Sub
End Class 

'This code example produces output similar to following:
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: SetValue, CreateSubKey, Delete, ReadKey, ChangePermissions
' Inheritance: ContainerInherit
' Propagation: None
'   Inherited? False
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: SetValue, CreateSubKey, Delete, ReadKey, ChangePermissions
' Inheritance: ContainerInherit
' Propagation: None
'   Inherited? False
'
'
'Current access rules:
'

Keterangan

Aturan dihapus hanya jika persis cocok rule di semua detail, termasuk bendera. Aturan lain dengan pengguna yang sama dan AccessControlType tidak terpengaruh.

Penting

Aturan mewakili satu atau beberapa entri kontrol akses (ACE) yang mendasarinya, dan entri ini dipisahkan atau digabungkan seperlunya saat Anda mengubah aturan keamanan akses untuk pengguna. Dengan demikian, aturan mungkin tidak lagi ada dalam bentuk tertentu yang dimilikinya ketika ditambahkan, dan dalam hal RemoveAccessRuleSpecific ini metode tidak dapat menghapusnya.