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| using System;
using System.Security.Principal;
namespace WebApp.Util
{
public class ImpersonateUser : System.IDisposable
{
protected const int LOGON32_PROVIDER_DEFAULT = 0;
protected const int LOGON32_LOGON_INTERACTIVE = 2;
public WindowsIdentity Identity = null;
private System.IntPtr m_accessToken;
[System.Runtime.InteropServices.DllImport("advapi32.dll", SetLastError = true)]
private static extern bool LogonUser(string lpszUsername, string lpszDomain,
string lpszPassword, int dwLogonType, int dwLogonProvider, ref System.IntPtr phToken);
[System.Runtime.InteropServices.DllImport("kernel32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
private extern static bool CloseHandle(System.IntPtr handle);
public ImpersonateUser()
{
this.Identity = WindowsIdentity.GetCurrent();
}
public ImpersonateUser(string username, string domain, string password)
{
Login(username, domain, password);
}
public void Login(string username, string domain, string password)
{
if (this.Identity != null)
{
this.Identity.Dispose();
this.Identity = null;
}
try
{
this.m_accessToken = new System.IntPtr(0);
Logout();
this.m_accessToken = System.IntPtr.Zero;
bool logonSuccessfull = LogonUser(
username,
domain,
password,
LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT,
ref this.m_accessToken);
if (!logonSuccessfull)
{
int error = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
throw new System.ComponentModel.Win32Exception(error);
}
Identity = new WindowsIdentity(this.m_accessToken);
}
catch
{
throw;
}
}
public void Logout()
{
if (this.m_accessToken != System.IntPtr.Zero)
CloseHandle(m_accessToken);
this.m_accessToken = System.IntPtr.Zero;
if (this.Identity != null)
{
this.Identity.Dispose();
this.Identity = null;
}
}
void System.IDisposable.Dispose()
{
Logout();
}
}
} |
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