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The first step in securing your applications is deciding where you need security and what it needs to protect. For example, you may need to block access in order to protect private information. Or, maybe you just need to enforce a pay-for-content system. Perhaps you don t need any sort of security at all, but you want an optional login feature to provide personalization for frequent visitors. These requirements will determine the approach you use. Security doesn t need to be complex, but it does need to be wide-ranging and multilayered. For example, consider an e-commerce website that allows users to view reports of their recently placed orders. You probably already know the first line of defense that this website should use a login page that forces users to identify themselves before they can see any personal information. In this chapter, you ll learn how to use this sort of authentication system. However, it s important to realize that, on its own, this layer of protection is not enough to truly secure your system. You also need to protect the back-end database with a strong password, and you might even choose to encrypt sensitive information before you store it (scrambling so that it s unreadable without the right key to decrypt it). Steps like these protect your website from other attacks that get beyond your authentication system. For example,

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Figure 1-2. Slashdot uses a database to display its pages according to your preferences. Delivering content and keeping track of user preferences aren t the only uses for a database in the Web environment, but they give you the idea. What about login systems, shopping carts, search engines, and bug-tracking systems They re all variations on a theme, implemented as a database with a Web front end.

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they can deter a disgruntled employee with an account on the local network, a hacker who has gained access to your network through the company firewall, or a careless technician who discards a hard drive used for data storage without erasing it first. Furthermore, you ll need to hunt carefully for weaknesses in the code you ve written. A surprising number of websites fall prey to relatively simple attacks in which a malicious user simply tampers with a query string argument or a bit of HTML in the rendered page. For example, in the e-commerce example you need to make sure that a user who successfully logs in can t view another user s recent orders. Imagine you ve created a ViewOrders.aspx page that takes a query string argument named userID, like this: http://localhost/InsecureStore/ViewOrders.aspx userID=4191 This example is a security nightmare, because any user can easily modify the userID parameter by editing the URL to see another user s information. A better solution would be to design the ViewOrders.aspx page so that it gets the user ID from the currently logged-on user identity (a trick you ll learn in this chapter), and then uses that to construct the right database command.

Once we have determined that both a username and password have been submitted, we try to authenticate the user This code is very similar to that of Listing 3-4 If we determine that the login attempt was successful, we perform three actions: 1 Record the successful login attempt When a user successfully logs in, we want to make a note of this in the application log file To do so, we will add a utility function to DatabaseObject_User called loginSuccess() This function will also update the ts_last_login field in the user table to record the timestamp of the user s most recent login We will look at the loginSuccess() function shortly This function must be called after a user record has been loaded in DatabaseObject_User 2 Update the identity data stored in session to include all of the values in the corresponding database row for this user.

injection attack. You learned to prevent this attack by using parameterized database commands in 15.

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