Authenticate when user clicks back button after logging out

Hi All,
Is there a way that the user can be forced to authenticate, if he has just logged out, and then clicks the back button.
I have a situation where a user who is working on relatively sensitive data logs out (yeees they should close the browser and all, but they never obey instructions... ) and someone else can come around and click the back button, and see what what he had been working on.
Is there a way to disable this behaviour, or otherwise force a reload/re-authentication.
Thanks.

Hi there,
You can accomplish this by writing this code in each page of your application
Write this in your html header:
<script type="text/javascript">
javascript:history.go(1);
</script>and write this in Page HTML Body Attribute:
onunload="javascript:history.go(1)";It will not allow your users to go back.
Thanks
Tauceef

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Invalidate session when user clicks back button

I want to invalidate the session when user clicks back button, so that user cannot refresh and reload a page.
Any suggestions will be highly appreciated.
Message was edited by:
sam_amc

* SessionInvalidator.java
* Created on October 27, 2006, 9:18 AM
package web;
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
* @author javious
* @version
public class SessionInvalidator extends HttpServlet {
    /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String reposted = request.getParameter("reposted");
        if("true".equals(reposted))
            HttpSession session = request.getSession(false);
            if(session == null)
                // This is step 4 and beyond
                out.println("<html>");
                out.println("<head>");
                out.println("<title>Servlet SessionInvalidator</title>");
                out.println("</head>");
                out.println("<body>");
                out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
                out.println("I said, your session is now invalid! Now where are those Duke Dollars at?");
                out.println("</body>");
                out.println("</html>");
            else
                Integer hitCount = (Integer)session.getAttribute("hitCount");
                if(hitCount == null)
                    // This is step 2 (the "good" - "stay" page.)
                    out.println("<html>");
                    out.println("<head>");
                    out.println("<title>Servlet SessionInvalidator</title>");
                    out.println("</head>");
                    out.println("<body>");
                    out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
                    out.println("Your session is good.<br>");
                    out.println("If you click the browser's back button, you will invalidate your session.");
                    out.println("</body>");
                    out.println("</html>");
                    hitCount = 1;
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                else
                    //We've used up our good visit
                    session.invalidate();
                    // This is step 3
                    out.println("<html>");
                    out.println("<head>");
                    out.println("<title>Servlet SessionInvalidator</title>");
                    out.println("</head>");
                    out.println("<body>");
                    out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
                    out.println("Your session is now invalid");
                    out.println("</body>");
                    out.println("</html>");
        else
            // because the javascript in the following output will never allow a user
            // to continue clicking back any further than this, we can safely create the session.
            // (or perhaps the session can already be created here and this may not be necessary).
            // A problem lies where if the user chooses to "select" a page back in history they thereby
            // potentially skip back "over" this functionality, thus defeating the purpose of it.
            request.getSession(true);
            // This is step 1 (indirection)
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet SessionInvalidator</title>");
            out.println("</head>");
            out.println("<body onload=\"document.getElementById('invalidatorForm').submit()\">");
            out.println("<h1>Servlet SessionInvalidator at " + request.getContextPath () + "</h1>");
            out.println("<form id=\"invalidatorForm\" action=\"SessionInvalidator\" method=\"POST\">");
            out.println("<input type=\"hidden\" name=\"reposted\" value=\"true\">");
            out.println("</form>");
            out.println("</body>");
            out.println("</html>");
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    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
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}The problem with even attempting to do this is that with today's browser capabilities, users can optionally choose to jump to a particular page in the browser history and this may not necessarily be the most recent page. In this case, you would also want to invalidate the user's session after already having been there (whatever page that may be). Then you have situations when the user may wish to jump back in history to external pages they were visiting before they reached your own site's pages. Then what happens when they start clicking forward, forward, etc... from there? This is why I prefer writing Swing Clients as alternatives to browser applications. There are soo many possible ways break web applications made for standard web browsers both maliciously and simply by accident or irregular user patterns. Regardless, this servlet would work based on the assumption that all the user(s) would "ever" do aside from moving logically forward is clicking on the browser's "back" button.
cheers!
Message was edited by:
javious

Stop user from cliking back button after logging out

How can I stop the user from clicking the back when they had clicked the log out link...?
<%@ page language="java" %>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
</body>
<script language="JavaScript" type="text/JavaScript">
function refreshIt() {
setTimeout('window.parent.location.reload()', 7 * 1000);
<%
session.removeAttribute("username");
session.invalidate();
response.sendRedirect( response.encodeRedirectUrl("index.jsp?message=You had logged out from the system"));
%>
document.onload = refreshIt();
</script>
</html>

You can NOT stop the user from clicking the "back" button.
However, all is not lost.
Since you're invalidating the session, simply have every page that requires the user to be logged in check for a valid session before proceeding. Put that code into an "include" file. If the session is invalidated, redirect the user back to the "Please Login" page. Do this IMMEDIATELY before doing ANYTHING.
Another technique, but is essentially the same thing, is to "logout" to a page with javascript that redirects the user to the "You are Now Logged Out" page, with either a "redirect" or a "window.forward()" call. When the user clicks "back", they'll return to the page with the javascript that redirects the user to the "You are Now Logged Out" page. The only problem with that is that savvy users using IE can click the "history" portion of the "back" button, and go back 2, 3, 4, etc. pages if they want to.
Therefore, you'll still have to write the code at the beginning of every page that kicks the user back to "Please Login" if the session was invalidated.

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Any suggestion? 1:57 am, my local time.......

I just use:
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Message was edited by: Hari Kiran

Triggering POPUP to SAVE when user Presses BACK Button

h4.
Hi Friends,
h4.
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h4.
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Authenticate when user clicks back button after logging out

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