impersonateValidUser = True
End If
End If
End If
End If
If Not tokenDuplicate.Equals(IntPtr.Zero) Then
CloseHandle(tokenDuplicate)
End If
If Not token.Equals(IntPtr.Zero) Then
CloseHandle(token)
End If
End Function
Private Sub undoImpersonation()
impersonationContext.Undo()
End Sub
</script>
Visual C# .NET
<%@ Page Language="C#"%>
<%@ Import Namespace = "System.Web" %>
<%@ Import Namespace = "System.Web.Security" %>
<%@ Import Namespace = "System.Security.Principal" %>
<%@ Import Namespace = "System.Runtime.InteropServices" %>
<script runat=server>
public const int LOGON32_LOGON_INTERACTIVE = 2;
public const int LOGON32_PROVIDER_DEFAULT = 0;
WindowsImpersonationContext impersonationContext;
[DllImport("advapi32.dll")]
public static extern int LogonUserA(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern int DuplicateToken(IntPtr hToken,
int impersonationLevel,
ref IntPtr hNewToken);
[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern bool RevertToSelf();
[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
public static extern bool CloseHandle(IntPtr handle);
public void Page_Load(Object s, EventArgs e)
{
if(impersonateValidUser("username", "domain", "password"))
{
//Insert your code that runs under the security context of a specific user here.
undoImpersonation();
}
else
{
//Your impersonation failed. Therefore, include a fail-safe mechanism here.
}
}
private bool impersonateValidUser(String userName, String domain, String password)
{
WindowsIdentity tempWindowsIdentity;
IntPtr token = IntPtr.Zero;
IntPtr tokenDuplicate = IntPtr.Zero;
if(RevertToSelf())
{
if(LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT, ref token) != 0)
{
if(DuplicateToken(token, 2, ref tokenDuplicate) != 0)
{
tempWindowsIdentity = new WindowsIdentity(tokenDuplicate);
impersonationContext = tempWindowsIdentity.Impersonate();
if (impersonationContext != null)
{
CloseHandle(token);
CloseHandle(tokenDuplicate);
return true;
}
}
}
}
if(token!= IntPtr.Zero)
CloseHandle(token);
if(tokenDuplicate!=IntPtr.Zero)
CloseHandle(tokenDuplicate);
return false;
}
private void undoImpersonation()
{
impersonationContext.Undo();
}
</script>
Visual J# .NET
<%@ Page language="VJ#" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Security.Principal" %>
<%@ Import Namespace="System.Runtime.InteropServices" %>
<script runat=server>
public static int LOGON32_LOGON_INTERACTIVE = 2;
public static int LOGON32_PROVIDER_DEFAULT = 0;
WindowsImpersonationContext impersonationContext;
/** @attribute DllImport("advapi32.dll") */
public static native int LogonUserA(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
System.IntPtr[] phToken);
/** @attribute DllImport("advapi32.dll",
CharSet=CharSet.Auto, SetLastError=true) */
public static native int DuplicateToken(System.IntPtr hToken,
int impersonationLevel,
System.IntPtr[] hNewToken);
/** @attribute DllImport("kernel32.dll",CharSet=CharSet.Auto) */
public static native boolean CloseHandle(System.IntPtr[] handle);
/** @attribute DllImport("advapi32.dll",
CharSet=CharSet.Auto,SetLastError=true) */
public static native boolean RevertToSelf();
public void Page_Load(Object s, System.EventArgs e)
{
if(impersonateValidUser("username", "domain", " password"))
{
//Insert your code that runs under the security context of a specific user here.
undoImpersonation();
}
else
{
//Your impersonation failed. Therefore, include a fail-safe mechanism here.
}
}
private boolean impersonateValidUser(String userName, String domain, String password)
{
WindowsIdentity tempWindowsIdentity;
System.IntPtr[] token = new System.IntPtr[1];
System.IntPtr[] tokenDuplicate = new System.IntPtr[1];
if(RevertToSelf())
{
if(LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT, token) != 0)
{
if(DuplicateToken(token[0], 2, tokenDuplicate) != 0)
{
tempWindowsIdentity = new WindowsIdentity(tokenDuplicate[0]);
impersonationContext = tempWindowsIdentity.Impersonate();
if (impersonationContext != null)
{
CloseHandle(tokenDuplicate);
CloseHandle(token);
return true;
}
}
}
}
if(!token[0].Equals(System.IntPtr.Zero))
CloseHandle(token);
if(!tokenDuplicate[0].Equals(System.IntPtr.Zero))
CloseHandle(tokenDuplicate);
return false;
}
private void undoImpersonation()
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