<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ --> 

<book xml:id="book.taint" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <?phpdoc extension-membership="pecl" ?>
 <title>Taint</title>
 <titleabbrev>Taint</titleabbrev>

 <preface xml:id="intro.taint">
  &reftitle.intro;
  <para>
   Taint is an extension, which is used for detecting XSS codes(tainted
   string).
   And also can be used to spot sql injection vulnerabilities, and shell
   inject, etc.
  </para>
  <para>
   When taint is enabled, if you pass a tainted string (comes from $_GET,
   $_POST or $_COOKIE) to some functions, taint will warn you about that.
  </para>
  <example>
   <title><function>Taint</function>example</title>
   <programlisting role="php">
<![CDATA[
<?php
$a = trim($_GET['a']);

$file_name = '/tmp' .  $a;
$output    = "Welcome, {$a} !!!";
$var       = "output";
$sql       = "Select *  from " . $a;
$sql      .= "ooxx";

echo $output;

print $$var;

include($file_name);

mysql_query($sql);
?>
]]>
   </programlisting>
   &example.outputs.similar;
   <screen>
<![CDATA[
Warning: main() [function.echo]: Attempt to echo a string that might be tainted

Warning: main() [function.echo]: Attempt to print a string that might be tainted

Warning: include() [function.include]: File path contains data that might be tainted

Warning: mysql_query() [function.mysql-query]: SQL statement contains data that might be tainted
]]>
   </screen>
  </example>
 </preface>

 &reference.taint.setup;
 &reference.taint.detail;
 &reference.taint.reference;

</book>

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