WindowsIdentity.Impersonate Método
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Permite al código suplantar a otro usuario de Windows.
Sobrecargas
| Impersonate() |
Suplanta al usuario representado por el objeto WindowsIdentity. |
| Impersonate(IntPtr) |
Suplanta al usuario representado por el token de usuario especificado. |
Impersonate()
Suplanta al usuario representado por el objeto WindowsIdentity.
public:
virtual System::Security::Principal::WindowsImpersonationContext ^ Impersonate();public virtual System.Security.Principal.WindowsImpersonationContext Impersonate ();abstract member Impersonate : unit -> System.Security.Principal.WindowsImpersonationContext
override this.Impersonate : unit -> System.Security.Principal.WindowsImpersonationContextPublic Overridable Function Impersonate () As WindowsImpersonationContextDevoluciones
Objeto que representa al usuario de Windows antes de la suplantación; se puede utilizar para revertirlo al contexto del usuario original.
Excepciones
Una identidad anónima intentó realizar una suplantación.
Error de Win32.
Ejemplos
En el ejemplo siguiente se muestra cómo obtener un token de cuenta de Windows mediante una llamada a la función Win32 LogonUser no administrada y cómo usar ese token para suplantar a otro usuario y, a continuación, revertir a la identidad original.
// This sample demonstrates the use of the WindowsIdentity class to impersonate a user.
// IMPORTANT NOTES:
// This sample requests the user to enter a password on the console screen.
// Because the console window does not support methods allowing the password to be masked,
// it will be visible to anyone viewing the screen.
// On Windows Vista and later this sample must be run as an administrator.
#using <System.dll>
using namespace System;
using namespace System::Runtime::InteropServices;
using namespace System::Security::Principal;
using namespace System::Security::Permissions;
[DllImport("advapi32.dll",SetLastError=true)]
bool LogonUser( String^ lpszUsername, String^ lpszDomain, String^ lpszPassword, int dwLogonType, int dwLogonProvider, IntPtr * phToken );
[DllImport("kernel32.dll",CharSet=CharSet::Auto)]
bool CloseHandle( IntPtr handle );
// Test harness.
// If you incorporate this code into a DLL, be sure to demand FullTrust.
[PermissionSetAttribute(SecurityAction::Demand,Name="FullTrust")]
int main()
{
IntPtr tokenHandle = IntPtr(0);
try
{
String^ userName;
String^ domainName;
// Get the user token for the specified user, domain, and password using the
// unmanaged LogonUser method.
// The local machine name can be used for the domain name to impersonate a user on this machine.
Console::Write( "Enter the name of the domain on which to log on: " );
domainName = Console::ReadLine();
Console::Write( "Enter the login of a user on {0} that you wish to impersonate: ", domainName );
userName = Console::ReadLine();
Console::Write( "Enter the password for {0}: ", userName );
const int LOGON32_PROVIDER_DEFAULT = 0;
//This parameter causes LogonUser to create a primary token.
const int LOGON32_LOGON_INTERACTIVE = 2;
const int SecurityImpersonation = 2;
tokenHandle = IntPtr::Zero;
// Call LogonUser to obtain a handle to an access token.
bool returnValue = LogonUser( userName, domainName, Console::ReadLine(), LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, &tokenHandle );
Console::WriteLine( "LogonUser called." );
if ( false == returnValue )
{
int ret = Marshal::GetLastWin32Error();
Console::WriteLine( "LogonUser failed with error code : {0}", ret );
throw gcnew System::ComponentModel::Win32Exception( ret );
}
Console::WriteLine( "Did LogonUser Succeed? {0}", (returnValue ? (String^)"Yes" : "No") );
Console::WriteLine( "Value of Windows NT token: {0}", tokenHandle );
// Check the identity.
Console::WriteLine( "Before impersonation: {0}", WindowsIdentity::GetCurrent()->Name );
// The token that is passed to the following constructor must
// be a primary token in order to use it for impersonation.
WindowsIdentity^ newId = gcnew WindowsIdentity( tokenHandle );
WindowsImpersonationContext^ impersonatedUser = newId->Impersonate();
// Check the identity.
Console::WriteLine( "After impersonation: {0}", WindowsIdentity::GetCurrent()->Name );
// Stop impersonating the user.
impersonatedUser->Undo();
// Check the identity.
Console::WriteLine( "After Undo: {0}", WindowsIdentity::GetCurrent()->Name );
// Free the tokens.
if ( tokenHandle != IntPtr::Zero )
CloseHandle( tokenHandle );
}
catch ( Exception^ ex )
{
Console::WriteLine( "Exception occurred. {0}", ex->Message );
}
}
// This sample demonstrates the use of the WindowsIdentity class to impersonate a user.
// IMPORTANT NOTES:
// This sample requests the user to enter a password on the console screen.
// Because the console window does not support methods allowing the password to be masked,
// it will be visible to anyone viewing the screen.
// On Windows Vista and later this sample must be run as an administrator.
using System;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Security.Permissions;
using Microsoft.Win32.SafeHandles;
using System.Runtime.ConstrainedExecution;
using System.Security;
public class ImpersonationDemo
{
[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword,
int dwLogonType, int dwLogonProvider, out SafeTokenHandle phToken);
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public extern static bool CloseHandle(IntPtr handle);
// Test harness.
// If you incorporate this code into a DLL, be sure to demand FullTrust.
[PermissionSetAttribute(SecurityAction.Demand, Name = "FullTrust")]
public static void Main(string[] args)
{
SafeTokenHandle safeTokenHandle;
try
{
string userName, domainName;
// Get the user token for the specified user, domain, and password using the
// unmanaged LogonUser method.
// The local machine name can be used for the domain name to impersonate a user on this machine.
Console.Write("Enter the name of the domain on which to log on: ");
domainName = Console.ReadLine();
Console.Write("Enter the login of a user on {0} that you wish to impersonate: ", domainName);
userName = Console.ReadLine();
Console.Write("Enter the password for {0}: ", userName);
const int LOGON32_PROVIDER_DEFAULT = 0;
//This parameter causes LogonUser to create a primary token.
const int LOGON32_LOGON_INTERACTIVE = 2;
// Call LogonUser to obtain a handle to an access token.
bool returnValue = LogonUser(userName, domainName, Console.ReadLine(),
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
out safeTokenHandle);
Console.WriteLine("LogonUser called.");
if (false == returnValue)
{
int ret = Marshal.GetLastWin32Error();
Console.WriteLine("LogonUser failed with error code : {0}", ret);
throw new System.ComponentModel.Win32Exception(ret);
}
using (safeTokenHandle)
{
Console.WriteLine("Did LogonUser Succeed? " + (returnValue ? "Yes" : "No"));
Console.WriteLine("Value of Windows NT token: " + safeTokenHandle);
// Check the identity.
Console.WriteLine("Before impersonation: "
+ WindowsIdentity.GetCurrent().Name);
// Use the token handle returned by LogonUser.
using (WindowsIdentity newId = new WindowsIdentity(safeTokenHandle.DangerousGetHandle()))
{
using (WindowsImpersonationContext impersonatedUser = newId.Impersonate())
{
// Check the identity.
Console.WriteLine("After impersonation: "
+ WindowsIdentity.GetCurrent().Name);
}
}
// Releasing the context object stops the impersonation
// Check the identity.
Console.WriteLine("After closing the context: " + WindowsIdentity.GetCurrent().Name);
}
}
catch (Exception ex)
{
Console.WriteLine("Exception occurred. " + ex.Message);
}
}
}
public sealed class SafeTokenHandle : SafeHandleZeroOrMinusOneIsInvalid
{
private SafeTokenHandle()
: base(true)
{
}
[DllImport("kernel32.dll")]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
[SuppressUnmanagedCodeSecurity]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool CloseHandle(IntPtr handle);
protected override bool ReleaseHandle()
{
return CloseHandle(handle);
}
}
' This sample demonstrates the use of the WindowsIdentity class to impersonate a user.
' IMPORTANT NOTES:
' This sample requests the user to enter a password on the console screen.
' Because the console window does not support methods allowing the password to be masked,
' it will be visible to anyone viewing the screen.
' On Windows Vista and later this sample must be run as an administrator.
Imports System.Runtime.InteropServices
Imports System.Security.Principal
Imports System.Security.Permissions
Imports Microsoft.Win32.SafeHandles
Imports System.Runtime.ConstrainedExecution
Imports System.Security
Module Module1
Public Class ImpersonationDemo
'Private Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As [String], _
' ByVal lpszDomain As [String], ByVal lpszPassword As [String], _
' ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, _
' ByRef phToken As IntPtr) As Boolean
Private Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As [String], _
ByVal lpszDomain As [String], ByVal lpszPassword As [String], _
ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, _
<Out()> ByRef phToken As SafeTokenHandle) As Boolean
Public Declare Auto Function CloseHandle Lib "kernel32.dll" (ByVal handle As IntPtr) As Boolean
' Test harness.
' If you incorporate this code into a DLL, be sure to demand FullTrust.
<PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _
Public Overloads Shared Sub Main(ByVal args() As String)
Dim safeTokenHandle As SafeTokenHandle = Nothing
Dim tokenHandle As New IntPtr(0)
Try
Dim userName, domainName As String
' Get the user token for the specified user, domain, and password using the
' unmanaged LogonUser method.
' The local machine name can be used for the domain name to impersonate a user on this machine.
Console.Write("Enter the name of a domain on which to log on: ")
domainName = Console.ReadLine()
Console.Write("Enter the login of a user on {0} that you wish to impersonate: ", domainName)
userName = Console.ReadLine()
Console.Write("Enter the password for {0}: ", userName)
Const LOGON32_PROVIDER_DEFAULT As Integer = 0
'This parameter causes LogonUser to create a primary token.
Const LOGON32_LOGON_INTERACTIVE As Integer = 2
' Call LogonUser to obtain a handle to an access token.
Dim returnValue As Boolean = LogonUser(userName, domainName, Console.ReadLine(), LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, safeTokenHandle)
Console.WriteLine("LogonUser called.")
If False = returnValue Then
Dim ret As Integer = Marshal.GetLastWin32Error()
Console.WriteLine("LogonUser failed with error code : {0}", ret)
Throw New System.ComponentModel.Win32Exception(ret)
Return
End If
Using safeTokenHandle
Dim success As String
If returnValue Then success = "Yes" Else success = "No"
Console.WriteLine(("Did LogonUser succeed? " + success))
Console.WriteLine(("Value of Windows NT token: " + safeTokenHandle.DangerousGetHandle().ToString()))
' Check the identity.
Console.WriteLine(("Before impersonation: " + WindowsIdentity.GetCurrent().Name))
' Use the token handle returned by LogonUser.
Using newId As New WindowsIdentity(safeTokenHandle.DangerousGetHandle())
Using impersonatedUser As WindowsImpersonationContext = newId.Impersonate()
' Check the identity.
Console.WriteLine(("After impersonation: " + WindowsIdentity.GetCurrent().Name))
' Free the tokens.
End Using
End Using
End Using
Catch ex As Exception
Console.WriteLine(("Exception occurred. " + ex.Message))
End Try
End Sub
End Class
End Module
Public NotInheritable Class SafeTokenHandle
Inherits SafeHandleZeroOrMinusOneIsInvalid
Private Sub New()
MyBase.New(True)
End Sub
Private Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As [String], _
ByVal lpszDomain As [String], ByVal lpszPassword As [String], _
ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, _
ByRef phToken As IntPtr) As Boolean
<DllImport("kernel32.dll"), ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success), SuppressUnmanagedCodeSecurity()> _
Private Shared Function CloseHandle(ByVal handle As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function
Protected Overrides Function ReleaseHandle() As Boolean
Return CloseHandle(handle)
End Function 'ReleaseHandle
End Class
Comentarios
En las plataformas Windows NT, el usuario actual debe tener derechos suficientes para permitir la suplantación.
Advertencia
Evite usar este método con el patrón async/await. En algunos casos, puede provocar problemas de confiabilidad debido a que no se revierte la suplantación, incluso si se elimina el resultado WindowsImpersonationContext . Utilice RunImpersonated en su lugar.
Notas a los autores de las llamadas
Después de usar Impersonate(), es importante llamar al Undo() método para finalizar la suplantación.
Se aplica a
Impersonate(IntPtr)
Suplanta al usuario representado por el token de usuario especificado.
public:
static System::Security::Principal::WindowsImpersonationContext ^ Impersonate(IntPtr userToken);public static System.Security.Principal.WindowsImpersonationContext Impersonate (IntPtr userToken);static member Impersonate : nativeint -> System.Security.Principal.WindowsImpersonationContextPublic Shared Function Impersonate (userToken As IntPtr) As WindowsImpersonationContextParámetros
- userToken
-
IntPtr
nativeint
Identificador de un token de cuenta de Windows. Normalmente, este token se recupera mediante una llamada a código no administrado, como puede ser una llamada a la función LogonUser de la API de Windows.
Devoluciones
Objeto que representa al usuario de Windows antes de la suplantación; se puede utilizar para revertir al contexto del usuario original.
Excepciones
Windows ha devuelto el código de estado de Windows NT STATUS_ACCESS_DENIED.
No hay suficiente memoria disponible.
El autor de llamada no dispone de los permisos requeridos.
Ejemplos
En el ejemplo siguiente se muestra cómo obtener un token de cuenta de Windows mediante una llamada a la función Win32 LogonUser no administrada y cómo usar ese token para suplantar a otro usuario y, a continuación, revertir a la identidad original.
// This sample demonstrates the use of the WindowsIdentity class to impersonate a user.
// IMPORTANT NOTES:
// This sample requests the user to enter a password on the console screen.
// Because the console window does not support methods allowing the password to be masked,
// it will be visible to anyone viewing the screen.
// On Windows Vista and later this sample must be run as an administrator.
using System;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Security.Permissions;
using Microsoft.Win32.SafeHandles;
using System.Runtime.ConstrainedExecution;
using System.Security;
public class ImpersonationDemo
{
[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword,
int dwLogonType, int dwLogonProvider, out SafeTokenHandle phToken);
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public extern static bool CloseHandle(IntPtr handle);
// Test harness.
// If you incorporate this code into a DLL, be sure to demand FullTrust.
[PermissionSetAttribute(SecurityAction.Demand, Name = "FullTrust")]
public static void Main(string[] args)
{
SafeTokenHandle safeTokenHandle;
try
{
string userName, domainName;
// Get the user token for the specified user, domain, and password using the
// unmanaged LogonUser method.
// The local machine name can be used for the domain name to impersonate a user on this machine.
Console.Write("Enter the name of the domain on which to log on: ");
domainName = Console.ReadLine();
Console.Write("Enter the login of a user on {0} that you wish to impersonate: ", domainName);
userName = Console.ReadLine();
Console.Write("Enter the password for {0}: ", userName);
const int LOGON32_PROVIDER_DEFAULT = 0;
//This parameter causes LogonUser to create a primary token.
const int LOGON32_LOGON_INTERACTIVE = 2;
// Call LogonUser to obtain a handle to an access token.
bool returnValue = LogonUser(userName, domainName, Console.ReadLine(),
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
out safeTokenHandle);
Console.WriteLine("LogonUser called.");
if (false == returnValue)
{
int ret = Marshal.GetLastWin32Error();
Console.WriteLine("LogonUser failed with error code : {0}", ret);
throw new System.ComponentModel.Win32Exception(ret);
}
using (safeTokenHandle)
{
Console.WriteLine("Did LogonUser Succeed? " + (returnValue ? "Yes" : "No"));
Console.WriteLine("Value of Windows NT token: " + safeTokenHandle);
// Check the identity.
Console.WriteLine("Before impersonation: "
+ WindowsIdentity.GetCurrent().Name);
// Use the token handle returned by LogonUser.
using (WindowsImpersonationContext impersonatedUser = WindowsIdentity.Impersonate(safeTokenHandle.DangerousGetHandle()))
{
// Check the identity.
Console.WriteLine("After impersonation: "
+ WindowsIdentity.GetCurrent().Name);
}
// Releasing the context object stops the impersonation
// Check the identity.
Console.WriteLine("After closing the context: " + WindowsIdentity.GetCurrent().Name);
}
}
catch (Exception ex)
{
Console.WriteLine("Exception occurred. " + ex.Message);
}
}
}
public sealed class SafeTokenHandle : SafeHandleZeroOrMinusOneIsInvalid
{
private SafeTokenHandle()
: base(true)
{
}
[DllImport("kernel32.dll")]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
[SuppressUnmanagedCodeSecurity]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool CloseHandle(IntPtr handle);
protected override bool ReleaseHandle()
{
return CloseHandle(handle);
}
}
' This sample demonstrates the use of the WindowsIdentity class to impersonate a user.
' IMPORTANT NOTES:
' This sample requests the user to enter a password on the console screen.
' Because the console window does not support methods allowing the password to be masked,
' it will be visible to anyone viewing the screen.
' On Windows Vista and later this sample must be run as an administrator.
Imports System.Runtime.InteropServices
Imports System.Security.Principal
Imports System.Security.Permissions
Imports Microsoft.Win32.SafeHandles
Imports System.Runtime.ConstrainedExecution
Imports System.Security
Module Module1
Public Class ImpersonationDemo
'Private Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As [String], _
' ByVal lpszDomain As [String], ByVal lpszPassword As [String], _
' ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, _
' ByRef phToken As IntPtr) As Boolean
Private Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As [String], _
ByVal lpszDomain As [String], ByVal lpszPassword As [String], _
ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, _
<Out()> ByRef phToken As SafeTokenHandle) As Boolean
Public Declare Auto Function CloseHandle Lib "kernel32.dll" (ByVal handle As IntPtr) As Boolean
' Test harness.
' If you incorporate this code into a DLL, be sure to demand FullTrust.
<PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _
Public Overloads Shared Sub Main(ByVal args() As String)
Dim safeTokenHandle As SafeTokenHandle
Dim tokenHandle As New IntPtr(0)
Try
Dim userName, domainName As String
' Get the user token for the specified user, domain, and password using the
' unmanaged LogonUser method.
' The local machine name can be used for the domain name to impersonate a user on this machine.
Console.Write("Enter the name of a domain on which to log on: ")
domainName = Console.ReadLine()
Console.Write("Enter the login of a user on {0} that you wish to impersonate: ", domainName)
userName = Console.ReadLine()
Console.Write("Enter the password for {0}: ", userName)
Const LOGON32_PROVIDER_DEFAULT As Integer = 0
'This parameter causes LogonUser to create a primary token.
Const LOGON32_LOGON_INTERACTIVE As Integer = 2
' Call LogonUser to obtain a handle to an access token.
Dim returnValue As Boolean = LogonUser(userName, domainName, Console.ReadLine(), LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, safeTokenHandle)
Console.WriteLine("LogonUser called.")
If False = returnValue Then
Dim ret As Integer = Marshal.GetLastWin32Error()
Console.WriteLine("LogonUser failed with error code : {0}", ret)
Throw New System.ComponentModel.Win32Exception(ret)
Return
End If
Using safeTokenHandle
Dim success As String
If returnValue Then success = "Yes" Else success = "No"
Console.WriteLine(("Did LogonUser succeed? " + success))
Console.WriteLine(("Value of Windows NT token: " + safeTokenHandle.DangerousGetHandle().ToString()))
' Check the identity.
Console.WriteLine(("Before impersonation: " + WindowsIdentity.GetCurrent().Name))
' Use the token handle returned by LogonUser.
Using impersonatedUser As WindowsImpersonationContext = WindowsIdentity.Impersonate(safeTokenHandle.DangerousGetHandle())
' Check the identity.
Console.WriteLine(("After impersonation: " + WindowsIdentity.GetCurrent().Name))
' Free the tokens.
End Using
End Using
Catch ex As Exception
Console.WriteLine(("Exception occurred. " + ex.Message))
End Try
End Sub
End Class
End Module
Public NotInheritable Class SafeTokenHandle
Inherits SafeHandleZeroOrMinusOneIsInvalid
Private Sub New()
MyBase.New(True)
End Sub
Private Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As [String], _
ByVal lpszDomain As [String], ByVal lpszPassword As [String], _
ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, _
ByRef phToken As IntPtr) As Boolean
<DllImport("kernel32.dll"), ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success), SuppressUnmanagedCodeSecurity()> _
Private Shared Function CloseHandle(ByVal handle As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function
Protected Overrides Function ReleaseHandle() As Boolean
Return CloseHandle(handle)
End Function 'ReleaseHandle
End Class
Comentarios
En las plataformas Windows NT, el usuario actual debe tener derechos suficientes para permitir la suplantación.
Nota
Llamar al Impersonate(IntPtr) método con un userToken valor de Zero equivale a llamar a la función Win32 RevertToSelf . Si otro usuario se está suplantando actualmente, el control se revierte al usuario original.
Para obtener más información sobre las llamadas a código no administrado, vea Consumo de funciones DLL no administradas.
Advertencia
Evite usar este método con el patrón async/await. En algunos casos, puede provocar problemas de confiabilidad debido a que no se revierte la suplantación, incluso si se elimina el resultado WindowsImpersonationContext . Utilice RunImpersonated en su lugar.
Notas a los autores de las llamadas
Después de usar Impersonate(IntPtr), es importante llamar al Undo() método para finalizar la suplantación.
Se aplica a
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