diff options
| author | Derek Jones <derek.jones@ellislab.com> | 2010-03-10 21:04:17 +0100 |
|---|---|---|
| committer | Derek Jones <derek.jones@ellislab.com> | 2010-03-10 21:04:17 +0100 |
| commit | 9898b892baed8d20f4138cb88c4f4ca3a082e444 (patch) | |
| tree | 193fa662d5dd6bd4c634324cecd4ef7d4b44c556 /user_guide/libraries/security.html | |
| parent | 5034e3fe8442fcb558225f6c528497227474c9ca (diff) | |
added Security class docs, cleaned up Input class for changes to both
Diffstat (limited to 'user_guide/libraries/security.html')
| -rw-r--r-- | user_guide/libraries/security.html | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/user_guide/libraries/security.html b/user_guide/libraries/security.html new file mode 100644 index 000000000..d5d725381 --- /dev/null +++ b/user_guide/libraries/security.html @@ -0,0 +1,123 @@ +<!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> +<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /> + +<script type="text/javascript" src="../nav/nav.js"></script> +<script type="text/javascript" src="../nav/prototype.lite.js"></script> +<script type="text/javascript" src="../nav/moo.fx.js"></script> +<script type="text/javascript" src="../nav/user_guide_menu.js"></script> + +<meta http-equiv='expires' content='-1' /> +<meta http-equiv= 'pragma' content='no-cache' /> +<meta name='robots' content='all' /> +<meta name='author' content='ExpressionEngine Dev Team' /> +<meta name='description' content='CodeIgniter User Guide' /> + +</head> +<body> + +<!-- START NAVIGATION --> +<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> +<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div> +<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> +</tr> +</table> +</div> +<!-- END NAVIGATION --> + + +<!-- START BREADCRUMB --> +<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> +<tr> +<td id="breadcrumb"> +<a href="http://codeigniter.com/">CodeIgniter Home</a> › +<a href="../index.html">User Guide Home</a> › +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 <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td> +</tr> +</table> +<!-- END BREADCRUMB --> + +<br clear="all" /> + + +<!-- 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($file, TRUE) === FALSE)<br /> +{<br /> + // file failed the XSS test<br /> +}</code> + + +<h2>$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> +<!-- END CONTENT --> + + +<div id="footer"> +<p> +Previous Topic: <a href="pagination.html">Pagination Class</a> + · +<a href="#top">Top of Page</a> · +<a href="../index.html">User Guide Home</a> · +Next Topic: <a href="sessions.html">Session Class</a> +</p> +<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2010 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p> +</div> + +</body> +</html>
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