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Now, you d like to go to the confirm page without logging in to test your progress. But you just logged in not long ago, so how do you make the application forget that you logged in You could wait, say, 30 minutes so that the session is timed out, but a faster way is to close the browser and start a new one. Then JBoss will treat it as a new browser (and thus a new user and a new session). Try it, and it should display the login page. But how do you return the user to the right page once he has logged in You can store the original view ID in the UserHolder web bean before redirecting to the login page and let the login page return to there on a successful login (see Listing 4-42, Listing 4-43, and Listing 4-44).

Summary

Accounts that have Host values containing wildcards are more susceptible to attack than accounts with literal Host values, because attackers can attempt to connect from a broader range of machines For example, if an account has User and Host values of root and %, it means that you can connect as root from anywhere if you know the password An attacker must guess the password, but she may attempt to do so by connecting from any host By contrast, if the host name is localhost, the attacker can attempt to connect as the root user only after first gaining access to the server host.

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In this chapter, we told you what happens on the server when you click a link in your browser to view a new page. We then introduced servlet and JSP technologies and explained what role they play in a web server. We showed you a simple HTML page and how you can begin to add dynamic content to it with JSP Next, we described how JSP-based applications are structured. Using the Ebookshop . sample application, we showed a practical example of the MVC architecture. Finally, we introduced you to Tomcat and described how to install the Ebookshop application. We covered a lot of ground in this chapter, showing you all the parts of a small working web application. Don t worry if you re finding it a bit difficult to absorb it all. Everything will become clear as we proceed through the next chapters in a more systematic fashion.

... @Named("uh") @SessionScoped public class UserHolder implements Serializable { private User currentUser; private String originalViewId; public String getOriginalViewId() { return originalViewId; } public void setOriginalViewId(String originalViewId) { this.originalViewId = originalViewId; } public User getCurrentUser() { return currentUser; } public void setCurrentUser(User currentUser) { this.currentUser = currentUser; } }

To find existing accounts that contain the '%' wildcard character anywhere in the Host column of the user table, use the following query: mysql> SELECT * FROM user WHERE Host LIKE '%\%%'; If you discover a hostname value that is extremely broad (for example, very few accounts really require a value of % in the Host column), change it with UPDATE to something more restrictive Then check the other grant tables for rows with the corresponding User and Host values and change the Host columns of any such rows as well If you do modify any accounts, issue a FLUSH PRIVILEGES statement afterward to tell the server to reload the grant tables so the changes take effect When you create new accounts (with the GRANT statement), avoid host values that contain wildcards, or at least constrain them so they are only as broad as necessary.

n the previous chapter, we placed JSP in the context of web applications, described JSP in generic terms, and showed a couple of examples. In this chapter, we ll briefly introduce all the JSP components and then jump into more interesting examples. For more details on the JSP components, please refer to Appendix D. At the end of this chapter, we ll show you an alternative syntax for JSP pages, which makes them 100% XML-compliant.

public class ForceLoginPhaseListener implements PhaseListener { public PhaseId getPhaseId() { return PhaseId.RENDER_RESPONSE; } public void beforePhase(PhaseEvent event) { FacesContext context = FacesContext.getCurrentInstance(); String viewId = context.getViewRoot().getViewId(); if (viewId.equals("/confirm.xhtml")) { Application app = context.getApplication(); UserHolder uh = (UserHolder) app.evaluateExpressionGet(context, "#{uh}", UserHolder.class); if (uh.getCurrentUser() == null) { uh.setOriginalViewId(viewId); ViewHandler viewHandler = app.getViewHandler(); UIViewRoot viewRoot = viewHandler.createView(context, "/login.xhtml"); context.setViewRoot(viewRoot);

Hostname patterns can be convenient for setting up an account that can be accessed by a given user from a set of machines, but you shouldn't use them unless you really need to In particular, resist the temptation to simply create all accounts with % as the hostname..

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