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LogonUser (advapi32)
 
.
Summary
allows you to programmatically log on a user.

C# Signature:

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
static extern int LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, LOGON_TYPE dwLogonType, LOGON_PROVIDER dwLogonProvider, out IntPtr phToken);

VB .NET Signature:

Declare Auto Function LogonUser Lib "advapi32.dll" (ByVal lpszUsername As String, _
   ByVal lpszDomain As String, ByVal lpszPassword As String, ByVal dwLogonType As Integer, _
   ByVal dwLogonProvider As Integer, ByRef phToken As IntPtr) As Integer

User-Defined Types:

LOGON_PROVIDER

LOGON_TYPE

Notes:

As always, only do SetLastError=true if you actually intend to call GetLastError.

Tips & Tricks:

Please add some!

Sample Code:

const int LOGON32_LOGON_INTERACTIVE       = 2;
const int LOGON32_LOGON_NETWORK       = 3;
const int LOGON32_LOGON_BATCH         = 4;
const int LOGON32_LOGON_SERVICE       = 5;
const int LOGON32_LOGON_UNLOCK        = 7;
const int LOGON32_LOGON_NETWORK_CLEARTEXT = 8;
const int LOGON32_LOGON_NEW_CREDENTIALS   = 9;

const int LOGON32_PROVIDER_DEFAULT    = 0;

IntPtr hToken;
IntPtr hTokenDuplicate;

if (LogonUser(username, domain, password,
     LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, out hToken))
{
     if (DuplicateToken(hToken, 2, out hTokenDuplicate))
     {
     windowsIdentity = new WindowsIdentity(hTokenDuplicate);
     impersonationContext = windowsIdentity.Impersonate();
     }
}

if (hToken != 0) CloseHandle(hToken);
if (hTokenDuplicate != 0) CloseHandle(hTokenDuplicate);

Alternative Managed API:

TODO

Documentation
LogonUser on MSDN

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