public static bool DoWorkUnderImpersonation(Func <bool> action, DomainAuthentication domainAuthentication)
{
if (domainAuthentication == null)
{
throw new Exception("Domain credentials must be provided.");
}
// 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;
try
{
// File.AppendAllText(@"C:\doc\impersonation.txt", "Windows identify before impersonation: " + WindowsIdentity.GetCurrent().Name);
// Call LogonUser to get a token for the user
bool loggedOn = LogonUser(domainAuthentication.Username,
domainAuthentication.Domain,
domainAuthentication.Password,
LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT,
ref userHandle);
if (!loggedOn)
{
// File.AppendAllText(@"C:\doc\impersonation.txt", "Exception impersonating user, error code: " + Marshal.GetLastWin32Error());
return(false);
}
// Begin impersonating the user
impersonationContext = WindowsIdentity.Impersonate(userHandle);
// File.AppendAllText(@"C:\doc\impersonation.txt", "Main() windows identify after impersonation: " + WindowsIdentity.GetCurrent().Name);
// Run the provided action using the provided user's handle.
return(action());
}
catch (Exception)
{
// File.AppendAllText(@"C:\doc\impersonation.txt", "Exception impersonating user: " + ex.Message);
return(false);
}
finally
{
// Clean up
if (impersonationContext != null)
{
impersonationContext.Undo();
}
if (userHandle != IntPtr.Zero)
{
CloseHandle(userHandle);
}
}
}
/// <summary>
/// Opens the download window that download the update and execute the installer when download completes.
/// </summary>
public static bool DownloadUpdate(UpdateInfoEventArgs args)
{
using (var downloadDialog = new DownloadUpdateDialog(args))
{
try
{
if (UseImpersonation)
{
DomainAuthentication domainAuthentication = new DomainAuthentication(ImpersonationUser, ImpersonationPassword, ImpersonationDomain);
return(Impersonator.DoWorkUnderImpersonation(() => downloadDialog.ShowDialog().Equals(DialogResult.OK), domainAuthentication));
}
else
{
return(downloadDialog.ShowDialog().Equals(DialogResult.OK));
}
}
catch (TargetInvocationException)
{
}
}
return(false);
}
