Re: LogonUser access denied

I'd expect to see a different error returned than what you are getting
(maybe there is some little coding difference), but the bottom line is that
you must either be running as SYSTEM or have the process account have the
"act as part of the operating system" OS privilege to call LogonUser on
Win2K.

Joe K.

--
Joe Kaplan-MS MVP Directory Services Programming
Co-author of "The .NET Developer's Guide to Directory Services Programming"
http://www.directoryprogramming.net
--
"Lee" <lee.walton@xxxxxxxxx> wrote in message
news:4C97245A-6820-4118-A674-31C90CCE52F4@xxxxxxxxxxxxxxxx
Thanks for your time guys, yes to confirm the OS is w2k

"Dominick Baier" wrote:

Hi,

which OS are you using? On W2K you need SYSTEM privileges to call
LogonUser...

dominick
www.leastprivilege.com

I am having problems trying to impersonate as a user in asp.net.

I get an access denied error on the LogonUser method of the following
code;

/// <summary>
/// Summary description for CustomWindowsIdentity.
/// </summary>
public class CustomWindowsIdentity : WindowsIdentity
{
[DllImport("advapi32.dll", SetLastError=true)]
private static extern int LogonUser(String lpszUsername, String
lpszDomain, String lpszPassword,
int dwLogonType, int dwLogonProvider, out int phToken);
[DllImport("kernel32.dll")]
private static extern int GetLastError();
public CustomWindowsIdentity( string domain, string username, string
password ) :
base( CustomWindowsIdentity.LogonUser(domain,username,password) )
{
}

//--------------------------------------------------------------------
------
// Impersonates as the supplied user.
// Domain must be in standard NT format: e.g. "DOMAIN"

//--------------------------------------------------------------------
------
public static WindowsImpersonationContext Impersonate( string
domain,
string username, string password )
{
IntPtr token = LogonUser( domain, username, password );
return WindowsIdentity.Impersonate( token );
}
private static IntPtr LogonUser( string domain, string username,
string
password )
{
int token = 0;
int loggedOn = LogonUser( username, domain, password,
0x8, 0x0,
//WindowsLogonType.NetworkClearText,
//WindowsLogonProvider.Default,
out token );
if (loggedOn==0 || token==0)
{
int ret = GetLastError();
//int ret = Marshal.GetLastWin32Error(); //GetLastError();
if (ret!=0)
{
WindowsIdentity currentUser = WindowsIdentity.GetCurrent();
throw new Win32Exception(ret,"DEBUG: " +
currentUser.Name.ToString());
}
}
IntPtr tokenOut = new IntPtr( token );

return tokenOut;
}
}
Its worth noting we are using a different user account for IIS
anonymous
authentication so the user that is trying to impersonate is
'DOMAIN\MY_READER'.
This same code block works on the production environment so my
thinking is
that its a permission or setting missing for the specific user on the
staging
server? Ive even tried having IIS use an administrator account for
anonymous
access but get the same error?
Any help, clues or pointers would be great.
many thanks






.

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