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authorDerek Jones <derek.jones@ellislab.com>2011-10-05 22:08:21 +0200
committerDerek Jones <derek.jones@ellislab.com>2011-10-05 22:08:21 +0200
commit4f0c8cb509f1a16e62bc1ddf23d035fcb06e0214 (patch)
treee0514a8f423613cfb31717e71c04ba186df1b0ae /user_guide/libraries/security.html
parent044a5221843cc2d88b936f3e658a1df4bc28cfe2 (diff)
parent57ccd441085a4d387a0c7acdd7eec00ff9c1077a (diff)
Merge branch 'develop' of github.com:EllisLab/CodeIgniter into develop
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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>
-<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>
-
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-<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 2.0.3</h1></td>
-<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
-</tr>
-</table>
-</div>
-<!-- END NAVIGATION -->
-
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-<!-- START BREADCRUMB -->
-<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
-<tr>
-<td id="breadcrumb">
-<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>
-</tr>
-</table>
-<!-- END BREADCRUMB -->
-
-<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>
-
-<p>If it is acceptable for the user input to include relative paths, e.g. <kbd>file/in/some/approved/folder.txt</kbd>, you can set the second optional parameter,
- <samp>$relative_path</samp> to TRUE.</p>
-
-<code>$filename = $this->security->sanitize_filename($this->input->post('filename'), TRUE);</code>
-
-<!-- @todo write docs for CSRF methods -->
-
-<h2>Cross-site request forgery (CSRF)</h2>
-
-<p>You can enable csrf protection by opening your <kbd>application/config/config.php</kbd> file and setting this:</p>
-<code>$config['csrf_protection'] = TRUE;</code>
-
-<p>If you use the <a href="../helpers/form_helper.html">form helper</a> the <var>form_open()</var> function will automatically insert a hidden csrf field in your forms.</p>
-
-<p>Select URIs can be whitelisted from csrf protection (for example API endpoints expecting externally POSTed content). You can add these URIs by editing the 'csrf_exclude_uris' config parameter:</p>
-<code>$config['csrf_exclude_uris'] = array('api/person/add');</code>
-
-</div>
-<!-- END CONTENT -->
-
-
-<div id="footer">
-<p>
-Previous Topic:&nbsp;&nbsp;<a href="pagination.html">Pagination Class</a>
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-</div>
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-</html> \ No newline at end of file