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Get User WINNT Logon Name?

Posted on 2004-04-23
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Last Modified: 2010-04-11
I am writing an Intranet app and need to get the user WINNT login name to allow access to the application.  I am using ASP.NET to write the app.  How do I capture the users WINNT logon name?
Thus far I have the following and it is not working:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here

        Dim authUserName As String
        Dim aspUserName As String
        authUserName = User.Identity.Name
        aspUserName = Principal.WindowsIdentity.GetCurrent.Name
        Dim userNameOnly As String = authUserName
        userNameOnly = userNameOnly.Replace("XXXX9999\", "")

       
         If authUserName = "XXXX9999\ABC" Then
            ///*** Allow user to view page****\\\
        Else
            ///*** Display message not allowed to view page****\\\
           
        End If

    End Sub
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Thank you.

LadyGail
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Question by:LadyGail
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11 Comments
 
LVL 5

Expert Comment

by:bitter_chicken
ID: 10901298
Hey ladygail
I've used this code before, but it is VB6 - I have absolutely NO IDEA of the differences between VB6  <> VB.NET so I'll post it here unchanged, hope it helps.

----------------------------------------------------------------------------------------------

Option Explicit
'*******************************************************************
'* Project Location = C:\PROJECTX
'* This code is copyright (c), 1999 Andrea VB Programming News Group
'*******************************************************************
'************** API's
' Used to Get the logged on User Name - see GetPCUser Function
Public Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpBuffer As String, nSize As Long) As Long

'**********************
'* Public Variables etc
Public FileName As String   '* Hold the loaded project name
'* You can use an array but I found it better in this case to use the collection
Public LineHold1 As New Collection   '* collections to hold parsed information from .vbp file
Public LineHold2 As New Collection
'* Microsoft Word Object - Use Project on the menu then select
'* References then select Microsoft Office 9.0 Objects I have Office 2000
'* for Word 97 use 8.0 objects

Public Function GetPCUser() As String
Dim szBuffer As String, lBuffSize As Long, RetVal As Boolean

'* Create the buffer
szBuffer = Space(255)

lBuffSize = Len(szBuffer)

RetVal = GetUserName(szBuffer, lBuffSize)
If RetVal Then
    '* Strip off the null character on the User name
    GetPCUser = Left$(szBuffer, InStr(szBuffer, vbNullChar) - 1)
   
Else
    '* nope nothing there??
     GetPCUser = "UnknownUser"
End If
End Function

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Author Comment

by:LadyGail
ID: 10901471
Not really, it need the code to run in asp.net.
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LVL 5

Expert Comment

by:bitter_chicken
ID: 10901629
oh well sorry

)-;

bc
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LVL 14

Expert Comment

by:JohnK813
ID: 10902189
Don't know if you can access environmental variables in ASP, but you can give this a shot:

Environ("USERNAME")

(also, sometimes the username may be listed under the "USER" or "UNAME" environmental variables)
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Author Comment

by:LadyGail
ID: 10902324
Environ("USERNAME") writes--ASPNET to the browser.
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LVL 14

Expert Comment

by:JohnK813
ID: 10902917
OK, that's probably because it's looking at the USERNAME on your server (and ASPNET is considered the user here), not the USERNAME of the computer accessing your page.

Hmmm... I don't know how to do this, sorry.  You may want to look into capturing the IP address or hostname, and converting that into a username (assuming each person has their own computer and only use that computer).

Another idea would be to use a cookie - the user enters their username once, and it's stored for future use.
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Author Comment

by:LadyGail
ID: 10903038
Thank you.
I got it to work.
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LVL 14

Expert Comment

by:JohnK813
ID: 10903069
May I ask how?  Using Environ()?
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Author Comment

by:LadyGail
ID: 10903106
Initially, the code I posted was shared with me by a co-worker.
However, I was getting errors using his code as posted above.
At this suggestion I looked through ALL of the files in his project to determine which file would result in the script functioning properly. Thus I happened to the file(s) that made the above script work.  Which file, I don't know.
But it works.
0
 

Author Comment

by:LadyGail
ID: 12508789
My working solutions is listed:

            Dim authUserName As String
            Dim aspUserName As String
            authUserName = User.Identity.Name
            aspUserName = Principal.WindowsIdentity.GetCurrent.Name
            Dim userNameOnly As String = authUserName
            userNameOnly = userNameOnly.Replace("D0960001\", "")

            If Trim(userNameOnly) = Trim(DSPageData2.Tables("ViewUsers").Rows(0).Item("User1")) Then
                If Trim(userNameOnly) = Trim(DSPageData2.Tables("ViewUsers").Rows(0).Item("User2")) Then
                    If Trim(userNameOnly) = Trim(DSPageData2.Tables("ViewUsers").Rows(0).Item("User3")) Then
                        If Trim(userNameOnly) = Trim(DSPageData2.Tables("ViewUsers").Rows(0).Item("User4")) Then
                        Else
                            Response.Redirect("../ErrorMessage/UnauthorizedAccess.aspx")
                        End If
                    End If
            End If
        End If

Thank you.

LadyGail

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Accepted Solution

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modulo earned 0 total points
ID: 12535560
Closed, 125 points refunded.

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