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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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-<td><h1>CodeIgniter User Guide Version 2.2.0</h1></td>
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-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
-<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
-Security
-</td>
-<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="ellislab.com/codeigniter/user-guide/" />Search User Guide&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>
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-<!-- START CONTENT -->
-<div id="content">
-
-<h1>Security</h1>
-
-<p>This page describes some "best practices" regarding web security, and details
-CodeIgniter's internal security features.</p>
-
-
-<h2>URI Security</h2>
-
-<p>CodeIgniter is fairly restrictive regarding which characters it allows in your URI strings in order to help
-minimize the possibility that malicious data can be passed to your application. URIs may only contain the following:
-</p>
-
-<ul>
-<li>Alpha-numeric text</li>
-<li>Tilde: ~ </li>
-<li>Period: .</li>
-<li>Colon: :</li>
-<li>Underscore: _</li>
-<li>Dash: -</li>
-</ul>
-
-<h2>Register_globals</h2>
-
-<p>During system initialization all global variables are unset, except those found in the $_GET, $_POST, and $_COOKIE arrays. The unsetting
-routine is effectively the same as register_globals = off.</p>
-
-<a name="error_reporting"></a>
-<h2>error_reporting</h2>
-
-<p>
- In production environments, it is typically desirable to disable PHP's
- error reporting by setting the internal error_reporting flag to a value of 0. This disables native PHP
- errors from being rendered as output, which may potentially contain
- sensitive information.
-</p>
-
-<p>
- Setting CodeIgniter's <kbd>ENVIRONMENT</kbd> constant in index.php to a
- value of '<kbd>production</kbd>' will turn off these errors. In development
- mode, it is recommended that a value of '<kbd>development</kbd>' is used.
- More information about differentiating between environments can be found
- on the <a href="environments.html">Handling Environments</a> page.
-</p>
-
-<h2>magic_quotes_runtime</h2>
-
-<p>The magic_quotes_runtime directive is turned off during system initialization so that you don't have to remove slashes when
-retrieving data from your database.</p>
-
-<h1>Best Practices</h1>
-
-<p>Before accepting any data into your application, whether it be POST data from a form submission, COOKIE data, URI data,
-XML-RPC data, or even data from the SERVER array, you are encouraged to practice this three step approach:</p>
-
-<ol>
-<li>Filter the data as if it were tainted.</li>
-<li>Validate the data to ensure it conforms to the correct type, length, size, etc. (sometimes this step can replace step one)</li>
-<li>Escape the data before submitting it into your database.</li>
-</ol>
-
-<p>CodeIgniter provides the following functions to assist in this process:</p>
-
-<ul>
-
-<li><h2>XSS Filtering</h2>
-
-<p>CodeIgniter comes with a Cross Site Scripting filter. This filter looks for commonly
-used techniques to embed malicious Javascript into your data, or other types of code that attempt to hijack cookies
-or do other malicious things. The XSS Filter is described <a href="../libraries/security.html">here</a>.
-</p>
-</li>
-
-<li><h2>Validate the data</h2>
-
-<p>CodeIgniter has a <a href="../libraries/form_validation.html">Form Validation Class</a> that assists you in validating, filtering, and prepping
-your data.</p>
-</li>
-
-<li><h2>Escape all data before database insertion</h2>
-
-<p>Never insert information into your database without escaping it. Please see the section that discusses
-<a href="../database/queries.html">queries</a> for more information.</p>
-
-</li>
-
-</ul>
-
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