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Tip of the Day
Language: NT
Expertise: Beginner
Oct 21, 1998

Reset NT password with 'User Must Change Password'

Question:
We are trying to reset the NT password using structure USER_INFO_1003. Everything worked fine. Then we also needed to set 'User Must Change Password at Next Logon' option. There is no structure just to change that. What I can find is that the only structure I can use is USER_INFO_3. This means that I have to user NetUserGetInfo() API to get all the user info using USER_INFO_3 and then use NetUserSetInfo() API to reset everything back except 'usri3_password_expired' value. This seems like a lot of work just to change one data value. On top of everything, I haven't been able to get this to work using both APIs. I get an error code 87: invalid parameter value. I am using VB6 for this.

Answer:
It may be a lot of work, but it is the way you will have to do it. The following will reset the "Test guest account" to force a password change on the next logon. Note that this will work on a LOCAL machine. If you want to do it remotely, you must pass the Server name to the function.

IN FORM:
Private Sub Command1_Click()
   Dim p_strUserName          As String
   
   p_strUserName = "Test guest account"
   
   If Module1.MustChangePassword(p_strUserName) = True Then
      MsgBox "Successfully set 'Must Change Password' for user '" & _
         p_strUserName & "'."
   Else
      MsgBox "Failed setting 'Must Change Password' for user '" & _
         p_strUserName & "'."
   End If
   
End Sub

IN BAS or CLS file:
Option Explicit

Public Declare Sub CopyMem Lib "kernel32" Alias _
   "RtlMoveMemory" (pTo As Any, pFrom As Any, _
   ByVal lCount As Long)
Private Declare Function NetApiBufferFree _
   Lib "netapi32.dll" _
   (ByVal lngPtrBuffer As Long) As Long
Private Declare Function NetUserSetInfo _
   Lib "netapi32" _
   (psServer As Byte, _
    psUser As Byte, _
    ByVal lLevel As Long, _
    ByVal pPtrBuffer As Long, _
    ParmErr As Long) As Long
Private Declare Function NetUserGetInfo _
   Lib "netapi32" _
   (ServerName As Byte, _
    UserName As Byte, _
    ByVal Level As Long, _
    lpBuffer As Long) As Long

Private Const NERR_Success As Long = 0&
Private Const UserInfo3 As Long = 3&

Private Type USER_INFO_3_API
   usri3_name              As Long
   usri3_password          As Long
   usri3_password_age      As Long
   usri3_priv              As Long
   usri3_home_dir          As Long
   usri3_comment           As Long
   usri3_flags             As Long
   usri3_script_path       As Long
   usri3_auth_flags        As Long
   usri3_full_name         As Long
   usri3_usr_comment       As Long
   usri3_parms             As Long
   usri3_workstations      As Long
   usri3_lastlogon         As Long
   usri3_lastlogoff        As Long
   usri3_acct_expires      As Long
   usri3_max_storage       As Long
   usri3_units_per_week    As Long
   usri3_logon_hours       As Long
   usri3_bad_pw_count      As Long
   usri3_num_logons        As Long
   usri3_logon_server      As Long
   usri3_country_code      As Long
   usri3_code_page         As Long
   usri3_user_id           As Long
   usri3_primary_group_id  As Long
   usri3_profile           As Long
   usri3_home_dir_drive    As Long
   usri3_password_expired  As Long
End Type

Public Function MustChangePassword(ByVal xi_strUserName As String) As Boolean
   Dim p_typUserInfo3API   As USER_INFO_3_API
   Dim p_bytSvrName()      As Byte
   Dim p_bytUserName()     As Byte
   Dim p_strServerName     As String
   Dim p_lngBuffer         As Long
   Dim p_lngParmErr        As Long
   Dim p_lngRtn            As Long
   
   ' ------------------------------------------
   ' Convert the server name to byte array
   ' ------------------------------------------
   p_strServerName = vbNullChar
   p_bytSvrName = p_strServerName
   
   ' ------------------------------------------
   ' Convert the user name to a byte array
   ' ------------------------------------------
   If Len(Trim$(xi_strUserName)) = 0 Then
      Exit Function 'Handle the error
   Else
      p_bytUserName = xi_strUserName & vbNullChar
   End If
   
   ' ------------------------------------------
   ' Get the current info
   ' ------------------------------------------
   p_lngRtn = NetUserGetInfo(p_bytSvrName(0), _
                             p_bytUserName(0), _
                             UserInfo3, _
                             p_lngBuffer)
   If p_lngRtn = NERR_Success Then
      CopyMem p_typUserInfo3API, _
              ByVal p_lngBuffer, _
              Len(p_typUserInfo3API)
   Else
      MsgBox "Error Number: " & p_lngRtn
   End If
   
   ' ------------------------------------------
   ' Set the current info
   ' ------------------------------------------
   p_typUserInfo3API.usri3_password_expired = 1
   p_lngBuffer = VarPtr(p_typUserInfo3API)
   
   p_lngRtn = NetUserSetInfo(p_bytSvrName(0), _
                             p_bytUserName(0), _
                             UserInfo3, _
                             p_lngBuffer, _
                             p_lngParmErr)
   If p_lngRtn = NERR_Success Then
      CopyMem p_typUserInfo3API, _
              ByVal p_lngBuffer, _
              Len(p_typUserInfo3API)
      MustChangePassword = True
   Else
      MsgBox "Error Number: " & p_lngRtn
   End If
      
   ' ------------------------------------------
   ' Clear the buffer
   ' ------------------------------------------
   If p_lngBuffer Then
      NetApiBufferFree p_lngBuffer
   End If
      
End Function
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