Validate username and password from AD

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Thread: Validate username and password from AD

  1. #1
    Join Date
    Jul 2004

    Validate username and password from AD

    Hi I am trying to validate a username and password against Active directory. Does any one have some sample code or point me in the right direction. It would need to work on both Winxp and 2000.

    The code below works fine on Winxp but not on Win2000 ??????

    I did get this code from an other site but can't get it to work on 2000

    Public Declare Function LogonUser Lib "Advapi32" Alias "LogonUserA" (ByVal _ 
        lpszUserName As String, ByVal lpszDomain As String, _ 
        ByVal lpszPassword As String, ByVal dwLogonType As Long, _ 
        ByVal dwLogonProvider As Long, phToken As Long) As Long 
    Public Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As _ 
    Const LOGON32_LOGON_NETWORK = 3& 
    ' Check whether a username/password pair is correct 
    ' if DOMAIN is omitted, it uses the local account database 
    ' and then asks trusted domains to search their account databases 
    ' until it finds the account or the search is exhausted 
    ' use DOMAIN="." to search only the local account database 
    '  IMPORTANT: works only under Windows NT and 2000 
    Public Function CheckWindowsUser(ByVal UserName As String, _ 
        ByVal Password As String, Optional ByVal Domain As String) As Boolean 
        Dim hToken As Long, ret As Long 
        ' provide a default for the Domain name 
        If Len(Domain) = 0 Then Domain = vbNullString 
        ' check the username/password pair 
        ' using LOGON32_LOGON_NETWORK delivers the best performance 
        ret = LogonUser(UserName, Domain, Password, LOGON32_LOGON_NETWORK, _ 
            LOGON32_PROVIDER_DEFAULT, hToken) 
        ' a non-zero value means success 
        If ret Then 
            CheckWindowsUser = True 
            CloseHandle hToken 
            do something
        End If 
    End Function

  2. #2
    Join Date
    Dec 2003
    Microsoft MVP (Visual Basic)

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