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authorDerek Jones <derek.jones@ellislab.com>2010-03-10 21:04:17 +0100
committerDerek Jones <derek.jones@ellislab.com>2010-03-10 21:04:17 +0100
commit9898b892baed8d20f4138cb88c4f4ca3a082e444 (patch)
tree193fa662d5dd6bd4c634324cecd4ef7d4b44c556 /user_guide/libraries/security.html
parent5034e3fe8442fcb558225f6c528497227474c9ca (diff)
added Security class docs, cleaned up Input class for changes to both
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<title>Security Class : CodeIgniter User Guide</title>
+
+<style type='text/css' media='all'>@import url('../userguide.css');</style>
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+<div id="masthead">
+<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
+<tr>
+<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td>
+<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></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 Class
+</td>
+<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/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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+<!-- END BREADCRUMB -->
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+<br clear="all" />
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+<!-- START CONTENT -->
+<div id="content">
+
+
+<h1>Security Class</h1>
+
+<p>The Security Class contains methods that help you create a secure application, processing input data for security.</p>
+
+<h2>XSS Filtering</h2>
+
+<p>CodeIgniter comes with a Cross Site Scripting Hack prevention filter which can either run automatically to filter
+all POST and COOKIE data that is encountered, or you can run it on a per item basis. By default it does <strong>not</strong>
+run globally since it requires a bit of processing overhead, and since you may not need it in all cases.</p>
+
+<p>The XSS filter looks for commonly used techniques to trigger Javascript or other types of code that attempt to hijack cookies
+or do other malicious things. If anything disallowed is encountered it is rendered safe by converting the data to character entities.</p>
+
+<p>
+Note: This function should only be used to deal with data upon submission. It's not something that should be used for general runtime processing since it requires a fair amount of processing overhead.</p>
+
+
+<p>To filter data through the XSS filter use this function:</p>
+
+<h2>$this->security->xss_clean()</h2>
+
+<p>Here is an usage example:</p>
+
+<code>$data = $this->security->xss_clean($data);</code>
+
+<p>If you want the filter to run automatically every time it encounters POST or COOKIE data you can enable it by opening your
+<kbd>application/config/config.php</kbd> file and setting this:</p>
+
+<code>$config['global_xss_filtering'] = TRUE;</code>
+
+<p>Note: If you use the form validation class, it gives you the option of XSS filtering as well.</p>
+
+<p>An optional second parameter, <dfn>is_image</dfn>, allows this function to be used to test images for potential XSS attacks, useful for file upload security. When this second parameter is set to <dfn>TRUE</dfn>, instead of returning an altered string, the function returns TRUE if the image is safe, and FALSE if it contained potentially malicious information that a browser may attempt to execute.</p>
+
+<code>if ($this->security->xss_clean($file, TRUE) === FALSE)<br />
+{<br />
+&nbsp;&nbsp;&nbsp;&nbsp;// file failed the XSS test<br />
+}</code>
+
+
+<h2>$this->security->sanitize_filename()</h2>
+
+<p>When accepting filenames from user input, it is best to sanitize them to prevent directory traversal and other security related issues. To do so, use the <dfn>sanitize_filename()</dfn> method of the Security class. Here is an example:</p>
+
+<code>$filename = $this->security->sanitize_filename($this->input->post('filename'));</code>
+
+<!-- @todo write docs for CSRF methods -->
+
+</div>
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