By Barry Dorrans

Programmers: safeguard and protect your internet apps opposed to assault!

You could recognize ASP.NET, but when you do not know how to safe your functions, you would like this e-book. This very important advisor explores the often-overlooked subject of educating programmers how you can layout ASP.NET internet functions on the way to hinder on-line thefts and defense breaches.

You'll commence with a radical examine ASP.NET 3.5 fundamentals and spot occurs if you happen to ''don't'' enforce defense, together with a few striking examples. The ebook then delves into the advance of an internet program, jogging you thru the susceptible issues at each section. learn how to issue defense in from the floor up, find a wealth of assistance and top practices, and discover code libraries and extra assets supplied via Microsoft and others. exhibits you step-by-step the right way to enforce the very most modern protection innovations finds the secrets and techniques of secret-keeping--encryption, hashing, and ''not'' leaking info to start with Delves into authentication, authorizing, and securing classes Explains tips to safe net servers and net companies, together with WCF and ASMX Walks you thru danger modeling, so that you can expect difficulties deals most sensible practices, ideas, and developments you could positioned to take advantage of immediately

Defend and safe your ASP.NET 3.5 framework sites with this must-have consultant

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Extra info for Beginning ASP.NET Security

Sample text

You’ve already realized that you cannot trust input from a query string, but what about POST requests? They can’t be changed by simply changing the URL. Now let’s create a completely fake request using Fiddler. 1. In the request window in Fiddler, select the Request Builder tab. This tab allows to you create a request from scratch. 2. aspx. aspx, and on a new line, enter Content-Type: application/x-www-form-urlencoded. :12345 on a new line, which would tell a Web server hosting multiple sites which Web site to route the request to.

Example=Hello-World . FIGURE 2-4: A sample GET request 24 ❘ CHAPTER 2 HOW THE WEB WORKS 6. Now, change the value after example= in the address bar and press Enter to load the page. You will see that you have changed the parameters sent to the page without having to submit the form itself — your fi rst faked request. This demonstrates how easy it can be to send unexpected values to a Web page. You should never take any input into your application at face value, and should always check and validate it before using it.

Your application is often the last layer between an attacker and back-end systems such as a database or a fi le server, which, in turn, may be connected to a corporate network. If your application is hacked, then these systems may be exposed to the attacker. By using several layers of defensive techniques in your application such as input validation, secure SQL construction, and proper authentication and authorization, your application will be more resilient against attack. Never Trust Input As you discovered in the example attack earlier in this chapter, a simple change to an input into the application may result in a security breach.

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