how to create a login page using login control in asp.net using windows authentication.?

Dear Laxmi,

The question itself saying that you are on right track fo .net. please go thro following link you will never forget.

https://forums.asp.net

Hi,

See this link,

http://weblogs.asp.net/scottgu/archive/2006/07/12/Recipe_3A00_-Enabling-Windows-Authentication-within-an-Intranet-ASP.NET-Web-application.aspx

P Narasimha17y

Hi Lakshimi,

Plz gothrough this code i think it is usefull .

Here is what the web.config looks like:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.web>
<authentication mode="Windows">
<forms name="imper2" protection="All" timeout="80" loginUrl="login.aspx" path="/"></forms>
</authentication>
<identity impersonate="true"></identity>
<authorization>
<deny users="?"></deny>
</authorization>
</system.web>
</configuration>

Here is what the login.aspx looks like

  <%@ Language=VBScript Debug="True" %>
  <%@ Import Namespace="System.Web" %>
  <%@ Import Namespace="System.Security.Principal" %>
  <%@ Import Namespace="System.Runtime.InteropServices" %>
  <%@ Import Namespace="System" %>
<html>
    <head>
        <script runat="server">
            Dim LOGON32_LOGON_INTERACTIVE As Integer = 3
            Dim LOGON32_PROVIDER_DEFAULT As Integer = 0
            
            Declare Auto Function LogonUser Lib "advapi32.dll" (lpszUsername As String, _
            lpszDomain As String, _
            lpszPassword As String, _
            dwLogonType As Integer, _
            dwLogonProvider As Integer, _
            ByRef phToken As IntPtr) As Integer
            
            Declare Auto Function DuplicateToken Lib "advapi32.dll" (ByVal ExistingTokenHandle As IntPtr, _
            ImpersonationLevel As Integer, _
            ByRef DuplicateTokenHandle As IntPtr) As Integer
            
            Instantiate a WindowsImpersonationContext
            Dim impersonationContext As WindowsImpersonationContext
            Dim currentWindowsIdentity As WindowsIdentity
            
            The page load function this page loads on startup
            Sub Button_Click(s As Object, e As EventArgs)
                If impersonateValidUser(txtUsername.Text, txtDomain.Text, txtPassword.Text) Then
                    Response.Write(User.Identity.Name)
                    undoImpersonation()
                Else
                    Response.Write("We're sorry, we were not able to impersonate you!")            
                End If    
            End Sub
            
            Private function impersonateValidUser() returns a boolean indicating
            if the function call was successful or failed
            Private Function impersonateValidUser(userName As String, domain As String, password As String) As Boolean
                'Dim userName As String = txtUsername.Text
                'Dim domain As String = txtDomain.Text
                'Dim password As String = txtPassword.Text
                
                Dim tempWindowsIdentity As WindowsIdentity
                Dim token As IntPtr
                Dim    tokenDuplicate As IntPtr
                
                If LogonUser("teacher", "mydomain", "*****", LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, token) <> 0 Then
                    If DuplicateToken (token, 3, tokenDuplicate) <> 0 Then
                        tempWindowsIdentity = New WindowsIdentity(tokenDuplicate)
                        impersonationContext = tempWindowsIdentity.Impersonate()
                        If impersonationContext is Nothing Then
                            impersonateValidUser = false
                        Else
                            impersonateValidUser = true
                        End If
                    Else 
                        impersonateValidUser = false
                    End If
                Else
                    impersonateValidUser = false
                End If
            End Function
        
        'reverse the impersonation operation and go back to the original permissions
        Private Sub undoImpersonation()
            impersonationContext.Undo()
        End Sub
        </script>
        <meta name="GENERATOR" Content="Microsoft Visual Studio.NET 7.0">
    </head>
    <body>
        <form runat="server">
            <h3>Please login here:</h3>
            <hr>
            Username:
            <asp:TextBox Runat="server" ID="txtUsername" TextMode=SingleLine></asp:TextBox>
            <br>
            Domain:
            <asp:TextBox Runat="server" ID="txtDomain" TextMode=SingleLine></asp:TextBox>
            <br>
            Password:
            <asp:TextBox Runat="server" ID="txtPassword" TextMode=Password></asp:TextBox>
            <br>
            <asp:Button Runat="server" Text="Login" OnClick="Button_Click"></asp:Button>
        </form>
    </body>
</html>

Thanks
Narasima

P Narasimha17y

Hi lakshmi
we have a login control in toolbox
u just drag and drop to webpage.then u open web.config file. in that we have seen that
<forms authentication mode="windows"/>
if u can change authentication mode into <forms authentication mode="forms"/>
-> u can go to website menu. in that we have a option websiteadminisration tool-> u can go to->security tab.-> then create users who ar logged into page.

17y

pls help me, its very urgent.

regards,

swathi

lakshmi17y

how to create a login page using login control in asp.net using windows authentication.?

5 Answers