Cómo: Agregar o quitar entradas de la lista de control de acceso

Para agregar o quitar entradas de la lista de control de acceso (ACL) de un archivo o directorio, obtenga el objeto FileSecurity o DirectorySecurity a partir del archivo o directorio. Modifique el objeto y, a continuación, vuelva a aplicarlo al archivo o directorio.

Desde un archivo

1. Llame al método FileSystemAclExtensions.GetAccessControl(FileInfo) (o, para aplicaciones de .NET Framework, FileInfo.GetAccessControl) para obtener un objeto FileSecurity que contenga las entradas de ACL actuales de un archivo.

2. Agregue o quite entradas de ACL del objeto FileSecurity obtenido en el paso 1.

3. Para aplicar los cambios, pase el objeto FileSecurity al FileSystemAclExtensions.SetAccessControl(FileInfo, FileSecurity) (o, para las aplicaciones de .NET Framework, FileInfo.SetAccessControl).

Desde un directorio

1. Llame al método FileSystemAclExtensions.GetAccessControl(DirectoryInfo) (o, para aplicaciones de .NET Framework, DirectoryInfo.GetAccessControl) para obtener un objeto DirectorySecurity que contenga las entradas de ACL actuales de un directorio.

2. Agregue o quite entradas de ACL del objeto DirectorySecurity obtenido en el paso 1.

3. Para aplicar los cambios, pase el objeto DirectorySecurity al FileSystemAclExtensions.SetAccessControl(DirectoryInfo, DirectorySecurity) (o, para las aplicaciones de .NET Framework, DirectoryInfo.SetAccessControl).

Ejemplo

Debe especificar una cuenta de usuario o grupo válida para ejecutar este ejemplo. En el ejemplo se usa un objeto FileInfo. Use el mismo procedimiento para la clase DirectoryInfo.

using System;
using System.IO;
using System.Security.AccessControl;

    class FileExample
    {
        public static void Main()
        {
            try
            {
                string fileName = "test.xml";

                Console.WriteLine($"Adding access control entry for {fileName}");

                // Add the access control entry to the file.
                AddFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);

                Console.WriteLine($"Removing access control entry from {fileName}");

                // Remove the access control entry from the file.
                RemoveFileSecurity(fileName, @"DomainName\AccountName",
                    FileSystemRights.ReadData, AccessControlType.Allow);

                Console.WriteLine("Done.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

        // Adds an ACL entry on the specified file for the specified account.
        public static void AddFileSecurity(string fileName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {
            FileInfo fileInfo = new(fileName);
            FileSecurity fSecurity = fileInfo.GetAccessControl();

            // Add the FileSystemAccessRule to the security settings.
            fSecurity.AddAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            fileInfo.SetAccessControl(fSecurity);
        }

        // Removes an ACL entry on the specified file for the specified account.
        public static void RemoveFileSecurity(string fileName, string account,
            FileSystemRights rights, AccessControlType controlType)
        {
            FileInfo fileInfo = new(fileName);
            FileSecurity fSecurity = fileInfo.GetAccessControl();

            // Remove the FileSystemAccessRule from the security settings.
            fSecurity.RemoveAccessRule(new FileSystemAccessRule(account,
                rights, controlType));

            // Set the new access settings.
            fileInfo.SetAccessControl(fSecurity);
        }
}

Imports System.IO
Imports System.Security.AccessControl

Module FileExample

    Sub Main()
        Try
            Dim fileName As String = "test.xml"

            Console.WriteLine("Adding access control entry for " & fileName)

            ' Add the access control entry to the file.
            AddFileSecurity(fileName, "DomainName\AccountName",
                FileSystemRights.ReadData, AccessControlType.Allow)

            Console.WriteLine("Removing access control entry from " & fileName)

            ' Remove the access control entry from the file.
            RemoveFileSecurity(fileName, "DomainName\AccountName",
                FileSystemRights.ReadData, AccessControlType.Allow)

            Console.WriteLine("Done.")
        Catch e As Exception
            Console.WriteLine(e)
        End Try

    End Sub

    ' Adds an ACL entry on the specified file for the specified account.
    Sub AddFileSecurity(ByVal fileName As String, ByVal account As String,
        ByVal rights As FileSystemRights, ByVal controlType As AccessControlType)

        Dim fileInfo As New FileInfo(fileName)
        Dim fSecurity As FileSecurity = fileInfo.GetAccessControl()

        ' Add the FileSystemAccessRule to the security settings. 
        Dim accessRule As New FileSystemAccessRule(account, rights, controlType)

        fSecurity.AddAccessRule(accessRule)

        ' Set the new access settings.
        fileInfo.SetAccessControl(fSecurity)

    End Sub

    ' Removes an ACL entry on the specified file for the specified account.
    Sub RemoveFileSecurity(ByVal fileName As String, ByVal account As String,
        ByVal rights As FileSystemRights, ByVal controlType As AccessControlType)

        Dim fileInfo As New FileInfo(fileName)
        Dim fSecurity As FileSecurity = fileInfo.GetAccessControl()

        ' Remove the FileSystemAccessRule from the security settings. 
        fSecurity.RemoveAccessRule(New FileSystemAccessRule(account,
            rights, controlType))

        ' Set the new access settings.
        fileInfo.SetAccessControl(fSecurity)

    End Sub
End Module