diff options
| author | Joël Cox <joel@joelcox.nl> | 2011-10-09 18:39:39 +0200 |
|---|---|---|
| committer | Joël Cox <joel@joelcox.nl> | 2011-10-09 18:39:39 +0200 |
| commit | f4fb1db458fab52d0493ead52c9ea7e01206eaa7 (patch) | |
| tree | c549600f342f4d3f0df75a2f2f7c265be0f1cc72 /user_guide/libraries/security.html | |
| parent | c4dd200c1155a118afa32cd91d9bd67bc243f83a (diff) | |
Moved tutorial to new user guide directory.
Diffstat (limited to 'user_guide/libraries/security.html')
| -rw-r--r-- | user_guide/libraries/security.html | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/user_guide/libraries/security.html b/user_guide/libraries/security.html deleted file mode 100644 index dd62a4386..000000000 --- a/user_guide/libraries/security.html +++ /dev/null @@ -1,135 +0,0 @@ -<!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 2.0.3</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> - -<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> - -</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 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> -</div> - -</body> -</html>
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