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By Chris Snyder Pro PHP Security: From Application Security by Chris Snyder, Thomas Myer, Michael Southwell

By Chris Snyder, Thomas Myer, Michael Southwell

Hypertext Preprocessor safety, similar to Hypertext Preprocessor itself, has complex. up-to-date for Hypertext Preprocessor 5.3, the second variation of this authoritative personal home page safety ebook covers foundational Hypertext Preprocessor defense issues like SQL injection, XSS, person authentication, and safe Hypertext Preprocessor improvement. Chris Snyder and Tom Myer additionally delve into contemporary advancements like cellular safeguard, the impression of JavaScript, and some great benefits of fresh Hypertext Preprocessor hardening efforts. professional personal home page safety, moment variation will function the complete consultant for taking protecting and proactive safety features inside of your personal home page purposes. newbies in safe programming will discover a lot of fabric on safe personal home page improvement, the fundamentals of encryption, safe protocols, in addition to how you can reconcile the calls for of server-side and internet program defense.

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Extra info for By Chris Snyder Pro PHP Security: From Application Security Principles to the Implementation of XSS Defenses (Expert (2nd Edition)

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The script that handles the form does not expect any value for the delete variable to be coming in from a regular user. But an attacker might very well be able to construct her own editObject form and try to use it to delete objects from the system. A more common example of a hidden interface might occur in an application that uses a value like $_GET['template'] to trigger the inclusion of a PHP script. template=debug just to see whether the developers happen to have left a debugging template around.

Numbers If you are expecting a number (like a year), receiving a nonnumeric response ought to raise red flags for you. Although it is true that PHP treats all form entries by default as string types, its automatic type casting permits you to determine whether the string that the user entered is capable of being interpreted as numeric (as it would have to be to be usable to your script). " ); Note that the error message here does not provide guidance to an attacker about exactly what has gone wrong with the attempt.

After listing the expected variables in an array, we step through them with a foreach() loop, pulling a value out of the $_POST array for each variable that exists in it. We use the ${$key} construct to assign each value to a variable named for the current value of that key (so, for example, when $key is pointing to the array value year, the assignment creates a variable $year that contains the value of the $_POST array contained in the key year). > A routine like this automatically excludes inappropriate values from the script, even if an attacker has figured out a way to submit them.

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