Download e-book for kindle: Ajax Security by Billy Hoffman

By Billy Hoffman

ISBN-10: 0321491939

ISBN-13: 9780321491930

This ebook might be required interpreting for someone who's constructing, operating with, or perhaps handling an internet software. the appliance does not also have to take advantage of Ajax. lots of the techniques during this booklet are safety practices for non-Ajax purposes which were prolonged and utilized to Ajax; no longer the wrong way round. for instance, SQL injection assaults can exist no matter if an program makes use of Ajax or now not, yet Ajax offers an attacker different "entry issues" to attempt to assault your software. every one carrier, approach, and parameter is taken into account an access point.

The ebook itself is definitely written. the fashion of writing is enticing. the one non-exciting a part of the publication is the bankruptcy on customer part garage (i.e. cookies, Flash facts items, neighborhood storage), yet this isn't the authors' fault. the subject itself isn't interesting and that i discovered myself analyzing it speedy so i'll get to the following bankruptcy. some of the most fascinating chapters is the only on JavaScript worms, just like the Samy computer virus. additionally fascinating are the occasional mentions of experiences and discoveries within the defense neighborhood. for instance, the authors describe a proof-of-concept port scanner they wrote utilizing JavaScript by myself, which has the potential of scanning IP addresses and detecting the kind of internet server they run (using the JS photo object). one other attention-grabbing instance used to be utilizing the :hover CSS classification in addition to JavaScript to discover websites consumer has visited.

After analyzing this booklet, i'm discovering myself correcting defense error i'm in basic terms understand discovering in my initiatives. a few corrections i have made hindrance JSON, the GET vs. submit factor, and others. With the corrections made, i think that my functions are much more secure. This booklet helped make that occur.

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Example text

Eve just retrieved information about all of the users with a single request! net was susceptible to SQL Injection, but the fact that they used client-side transformation instead of server-side transformation means that Eve can steal their entire database with just a few queries instead of waiting a long time using an automated SQL Injection tool like Absinthe. Eve is very happy that she harvested a list of usernames and passwords. People often use the same username and password on other Web sites.

Unfortunately, this only gets us part of the way to where we want to go. The real problem with Web applications is not so much that it takes a long time for the application to respond to user input, but rather that the user is blocked from performing any useful action from the time he submits his request to the time the browser renders the response. The user basically has to simply sit and wait, as you can see in Figure 1-1. User Server Request page Wait for response Process request Return complete page Wait for request or handle other users Work on page Request new page Wait for response Figure 1-1 4 Process request Classic synchronous Web request/response model AN AJAX PRIMER Unless we can get round-trip response times in the hundredths-of-seconds range (which with today’s technology is simply impossible to accomplish), the synchronous request model will not be as responsive as a locally installed desktop application.

Php" method="GET"> The current time is: 21:46:02

Now, let’s look at the same application (see Figure 1-4) after it’s been “Ajaxified”: Figure 1-4 An Ajax-enabled Web application that displays the current time On the surface, the application looks exactly the same as its predecessor. Under the covers, however, it is very different. Pressing the Refresh button no longer causes a complete page refresh. Instead, it simply calls back to the server to get the current time.

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Ajax Security by Billy Hoffman

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