this works for me, full working example (I wish more people would do this):
//logon impersonation
using System.Runtime.InteropServices; // DllImport
using System.Security.Principal; // WindowsImpersonationContext
using System.Security.Permissions; // PermissionSetAttribute
...
class Program {
// obtains user token
[DllImport("advapi32.dll", SetLastError = true)]
public static extern bool LogonUser(string pszUsername, string pszDomain, string pszPassword,
int dwLogonType, int dwLogonProvider, ref IntPtr phToken);
// closes open handes returned by LogonUser
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public extern static bool CloseHandle(IntPtr handle);
public void DoWorkUnderImpersonation() {
//elevate privileges before doing file copy to handle domain security
WindowsImpersonationContext impersonationContext = null;
IntPtr userHandle = IntPtr.Zero;
const int LOGON32_PROVIDER_DEFAULT = 0;
const int LOGON32_LOGON_INTERACTIVE = 2;
string domain = ConfigurationManager.AppSettings["ImpersonationDomain"];
string user = ConfigurationManager.AppSettings["ImpersonationUser"];
string password = ConfigurationManager.AppSettings["ImpersonationPassword"];
try {
Console.WriteLine("windows identify before impersonation: " + WindowsIdentity.GetCurrent().Name);
// if domain name was blank, assume local machine
if (domain == "")
domain = System.Environment.MachineName;
// Call LogonUser to get a token for the user
bool loggedOn = LogonUser(user,
domain,
password,
LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT,
ref userHandle);
if (!loggedOn) {
Console.WriteLine("Exception impersonating user, error code: " + Marshal.GetLastWin32Error());
return;
}
// Begin impersonating the user
impersonationContext = WindowsIdentity.Impersonate(userHandle);
Console.WriteLine("Main() windows identify after impersonation: " + WindowsIdentity.GetCurrent().Name);
//run the program with elevated privileges (like file copying from a domain server)
DoWork();
} catch (Exception ex) {
Console.WriteLine("Exception impersonating user: " + ex.Message);
} finally {
// Clean up
if (impersonationContext != null) {
impersonationContext.Undo();
}
if (userHandle != IntPtr.Zero) {
CloseHandle(userHandle);
}
}
}
private void DoWork() {
//everything in here has elevated privileges
//example access files on a network share through e$
string[] files = System.IO.Directory.GetFiles(@"\\domainserver\e$\images", "*.jpg");
}
}