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authorKyle Farris <kylefarris@kylefarris.gotdns.org>2011-10-14 21:43:25 +0200
committerKyle Farris <kylefarris@kylefarris.gotdns.org>2011-10-14 21:43:25 +0200
commitad17f4b932b3728c1e299b48f28b3ae0dbdd6b0b (patch)
treefdb357433e76000bdef60c4d18e5ab0540b07aeb /user_guide/libraries/security.html
parentdb46d02ac23b8e0bc2416e197494d3b795b57530 (diff)
parenta2125a5d830fd390b4cf35f77e9bb0558cfa2dd7 (diff)
Merged with development
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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' />
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-<script type="text/javascript" src="../nav/moo.fx.js"></script>
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-<td><h1>CodeIgniter User Guide Version 2.0.3</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 Class
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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 -->
-
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-<div id="footer">
-<p>
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