By Ilia Alshanetsky, Rasmus Lerdorf
With the variety of protection flaws and exploits came upon and published each day regularly at the upward push, understanding how one can write safe and trustworthy functions is develop into increasingly more vital on a daily basis. Written by means of Ilia Alshanetsky, one of many best specialists on Hypertext Preprocessor safeguard on this planet, php|architect's consultant to Hypertext Preprocessor defense specializes in giving you the entire instruments and data you must either safe your present purposes and writing new platforms with defense in brain. This booklet supplies a step by step advisor to every security-related subject, supplying you with real-world examples of right coding practices and their implementation in Hypertext Preprocessor in a correct, concise and whole manner. presents thoughts acceptable to any model of personal home page, together with 4.x and 5.x incorporates a step by step consultant to securing your purposes incorporates a accomplished assurance of protection layout Teaches you the way to safeguard your self from hackers exhibits you ways to distract hackers with a "tar pit" that can assist you fend off capability assaults"
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Extra resources for php|architect's Guide to PHP Security
Example text
To reduce this overhead, you may want to consider using a different regex package available in PHP, the PCRE extension. PCRE provides an interface to a much more powerful, Perlcompatible regular expression library that offers a number of advantages over vanilla PHP regex. For example, PCRE stores the compiled regular expression after the first execution. Subsequent compares simply perform the match. For single byte character sets, the combination of a proper locale and [[:alpha:]] works just as it does in the standard PHP regex.
For instance, an entity does not need a trailing semicolon. ' is a perfectly valid entity that the browser happily displays as a single quote. But if the semicolon is optional, then all of the regular expressions shown previously could fail. To further complicate matters, the numeric value of an entity can be expressed as a hexadecimal value. So, @ Cross-Site Scripting Prevention also represents a single quote. ) Hexadecimal values aren’t covered by the regular expressions shown above either.
All of those “special” characters get converted to the equivalent HTML entities, such as & for ampersand, which effectively treat the character as a literal instead of part of the underlying page code. gif"></ a> As another example, < gets converted to <, useful because < typically opens an HTML tag. It’s best to encode even the simplest user input, lest something like < or > inadvertently corrupt the page structure. Handling Attributes While it may be obvious why the HTML tag open/close characters need to be escaped, many people don’t realize the importance of encoding the quoting characters.