153 lines
5.6 KiB
HTML
153 lines
5.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Security : CodeIgniter User Guide</title>
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<style type='text/css' media='all'>@import url('../userguide.css');</style>
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<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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<script type="text/javascript" src="../nav/nav.js"></script>
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<script type="text/javascript" src="../nav/prototype.lite.js"></script>
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<script type="text/javascript" src="../nav/moo.fx.js"></script>
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<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
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<meta http-equiv='expires' content='-1' />
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<meta http-equiv= 'pragma' content='no-cache' />
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<meta name='robots' content='all' />
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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</head>
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<body>
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<!-- START NAVIGATION -->
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<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>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 1.7.3</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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</tr>
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</table>
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</div>
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<!-- END NAVIGATION -->
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<!-- START BREADCRUMB -->
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Security
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</td>
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<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>
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</tr>
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</table>
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<!-- END BREADCRUMB -->
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>Security</h1>
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<p>This page describes some "best practices" regarding web security, and details
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CodeIgniter's internal security features.</p>
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<h2>URI Security</h2>
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<p>CodeIgniter is fairly restrictive regarding which characters it allows in your URI strings in order to help
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minimize the possibility that malicious data can be passed to your application. URIs may only contain the following:
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</p>
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<ul>
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<li>Alpha-numeric text</li>
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<li>Tilde: ~ </li>
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<li>Period: .</li>
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<li>Colon: :</li>
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<li>Underscore: _</li>
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<li>Dash: -</li>
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</ul>
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<h2>GET, POST, and COOKIE Data</h2>
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<p>GET data is simply disallowed by CodeIgniter since the system utilizes URI segments rather than traditional URL query strings (unless
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you have the query string option enabled in your config file). The global GET
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array is <strong>unset</strong> by the Input class during system initialization.</p>
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<h2>Register_globals</h2>
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<p>During system initialization all global variables are unset, except those found in the $_POST and $_COOKIE arrays. The unsetting
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routine is effectively the same as register_globals = off.</p>
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<h2>magic_quotes_runtime</h2>
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<p>The magic_quotes_runtime directive is turned off during system initialization so that you don't have to remove slashes when
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retrieving data from your database.</p>
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<h1>Best Practices</h1>
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<p>Before accepting any data into your application, whether it be POST data from a form submission, COOKIE data, URI data,
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XML-RPC data, or even data from the SERVER array, you are encouraged to practice this three step approach:</p>
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<ol>
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<li>Filter the data as if it were tainted.</li>
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<li>Validate the data to ensure it conforms to the correct type, length, size, etc. (sometimes this step can replace step one)</li>
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<li>Escape the data before submitting it into your database.</li>
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</ol>
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<p>CodeIgniter provides the following functions to assist in this process:</p>
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<ul>
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<li><h2>XSS Filtering</h2>
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<p>CodeIgniter comes with a Cross Site Scripting filter. This filter looks for commonly
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used techniques to embed malicious Javascript into your data, or other types of code that attempt to hijack cookies
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or do other malicious things. The XSS Filter is described <a href="../libraries/input.html">here</a>.
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</p>
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</li>
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<li><h2>Validate the data</h2>
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<p>CodeIgniter has a <a href="../libraries/form_validation.html">Form Validation Class</a> that assists you in validating, filtering, and prepping
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your data.</p>
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</li>
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<li><h2>Escape all data before database insertion</h2>
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<p>Never insert information into your database without escaping it. Please see the section that discusses
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<a href="../database/queries.html">queries</a> for more information.</p>
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</li>
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</ul>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="alternative_php.html">Alternative PHP</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="styleguide.html">PHP Style Guide</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2010 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
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</div>
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</body>
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</html>
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