LogonUser issues
From: BLiTZWiNG (BLiTZWiNG_at_discussions.microsoft.com)
Date: 01/27/05
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Date: Wed, 26 Jan 2005 19:07:01 -0800
Having a few strage behaviours with this function, mainly in that when I try
to logon to another computer with a different name/pass to the current user
of the local machine, it tries to impersonate me, not the credentials I gave
it.
LogonUser succeeds only when using LOGON32_LOGON_NEW_CREDENTIALS (9). Any
other LogonType causes error 126: Specified module could not be found -
whatever that means...
The initial WindowsIdentity.GetCurrent() reveals "DELLWING\Trent" as the
user, which is my local account. Upon success of LogonUser I create a new
WindowsIdentity with the received token. Printing out the details reveals
"DELLWING\Trent" as the user, even though I supplied "Administrator" and the
password of the remote box. I then get "Unable to Impersonate User" when
trying Impersonate().
Why would the token come back represent me when I specified a whole nother
user and computer?
My code looks like this currently (thanks to Willy Denoyette).
-----------------------
using System;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Security.Permissions;
namespace SecurityTest
{
/// <summary>
/// Summary description for Class1.
/// </summary>
class SecurityTest
{
[DllImport("advapi32.DLL")]
public static extern int LogonUser(string lpszUsername, string lpszDomain,
string lpszPassword, int dwLogonType, int dwLogonProvider, out IntPtr
phToken);
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
IntPtr admin_token;
// This works fine
WindowsIdentity wid_current = WindowsIdentity.GetCurrent();
Console.WriteLine("Current Name: " + wid_current.Name);
Console.WriteLine("Current Token: " + wid_current.Token);
if (LogonUser("Administrator", "192.168.0.5", "password", 9, 0, out
admin_token) != 0)
{
WindowsIdentity wid_admin = new WindowsIdentity(admin_token);
Console.WriteLine("Remote Name: " + wid_admin.Name);
Console.WriteLine("Remote Token: " + wid_admin.Token);
WindowsImpersonationContext wic = null;
try
{
wic = wid_admin.Impersonate();
// Always get an exception here after Impersonate
System.IO.File.Copy("C:\\test_read\\test.txt",
"\\\\192.168.0.5\\trent\\test.txt", true);
}
catch (System.Exception se)
{
Console.WriteLine(se.Message);
}
finally
{
if (wic != null) wic.Undo();
}
}
else
{
int ret = Marshal.GetLastWin32Error();
Console.WriteLine(ret.ToString(), "Error");
}
}
}
- Next message: Meenu Mehta: "utf-8 and ascii"
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