How do you do Impersonation in .NET?

Question

Is there a simple out of the box way to impersonate a user in .NET?

So far I\'ve been using this class from code project for all my impersonation requirements.

Answer 1

View more detail from my previous answer I have created an nuget package Nuget

Code on Github

sample : you can use :

           string login = "";
           string domain = "";
           string password = "";

           using (UserImpersonation user = new UserImpersonation(login, domain, password))
           {
               if (user.ImpersonateValidUser())
               {
                   File.WriteAllText("test.txt", "your text");
                   Console.WriteLine("File writed");
               }
               else
               {
                   Console.WriteLine("User not connected");
               }
           }

Vieuw the full code :

using System;
using System.Runtime.InteropServices;
using System.Security.Principal;


/// 

/// Object to change the user authticated
/// 
public class UserImpersonation : IDisposable
{
    /// 

    /// Logon method (check athetification) from advapi32.dll
    /// 
    /// 
    /// 
    /// 
    /// 
    /// 
    /// 
    /// 
    [DllImport("advapi32.dll")]
    private static extern bool LogonUser(String lpszUserName,
        String lpszDomain,
        String lpszPassword,
        int dwLogonType,
        int dwLogonProvider,
        ref IntPtr phToken);

    /// 

    /// Close
    /// 
    /// 
    /// 
    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    public static extern bool CloseHandle(IntPtr handle);

    private WindowsImpersonationContext _windowsImpersonationContext;
    private IntPtr _tokenHandle;
    private string _userName;
    private string _domain;
    private string _passWord;

    const int LOGON32_PROVIDER_DEFAULT = 0;
    const int LOGON32_LOGON_INTERACTIVE = 2;

    /// 

    /// Initialize a UserImpersonation
    /// 
    /// 
    /// 
    /// 
    public UserImpersonation(string userName, string domain, string passWord)
    {
        _userName = userName;
        _domain = domain;
        _passWord = passWord;
    }

    /// 

    /// Valiate the user inforamtion
    /// 
    /// 
    public bool ImpersonateValidUser()
    {
        bool returnValue = LogonUser(_userName, _domain, _passWord,
                LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
                ref _tokenHandle);

        if (false == returnValue)
        {
            return false;
        }

        WindowsIdentity newId = new WindowsIdentity(_tokenHandle);
        _windowsImpersonationContext = newId.Impersonate();
        return true;
    }

    #region IDisposable Members

    /// 

    /// Dispose the UserImpersonation connection
    /// 
    public void Dispose()
    {
        if (_windowsImpersonationContext != null)
            _windowsImpersonationContext.Undo();
        if (_tokenHandle != IntPtr.Zero)
            CloseHandle(_tokenHandle);
    }

    #endregion
}