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www.giggi.me / code-igniter-v3-giggi / 43e0fbb650d05466cd2568b8a2cc1c38849a6b52 / . / user_guide / general / security.html
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adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Derek Allardafd99ac2008-01-19 19:59:14 +0000[diff] [blame]2<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]3<head>
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Derek Allard8039d4c2008-05-31 02:47:56 +0000[diff] [blame]5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
Derek Jonesfd93d222008-05-06 15:18:50 +0000[diff] [blame]6<title>Security : CodeIgniter User Guide</title>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]7
8<style type='text/css' media='all'>@import url('../userguide.css');</style>
9<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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Derek Allard3d879d52008-01-18 19:41:32 +0000[diff] [blame]19<meta name='author' content='ExpressionEngine Dev Team' />
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]20<meta name='description' content='CodeIgniter User Guide' />
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]21
22</head>
23<body>
24
25<!-- START NAVIGATION -->
26<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
Rick Ellis7cdef032008-08-26 18:44:54 +0000[diff] [blame]27<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>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]28<div id="masthead">
29<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
30<tr>
Derek Jones1ca3fc42008-06-27 00:19:33 +0000[diff] [blame]31<td><h1>CodeIgniter User Guide Version 1.6.3</h1></td>
adminc0d5d522006-10-30 19:40:35 +0000[diff] [blame]32<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]33</tr>
34</table>
35</div>
36<!-- END NAVIGATION -->
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38
39<!-- START BREADCRUMB -->
40<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
41<tr>
42<td id="breadcrumb">
Derek Jones7a9193a2008-01-21 18:39:20 +0000[diff] [blame]43<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]44<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
45Security
46</td>
Derek Allardbc030912007-06-24 18:25:29 +0000[diff] [blame]47<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>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]48</tr>
49</table>
50<!-- END BREADCRUMB -->
51
52<br clear="all" />
53
54
55<!-- START CONTENT -->
56<div id="content">
57
58<h1>Security</h1>
59
60<p>This page describes some "best practices" regarding web security, and details
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]61CodeIgniter's internal security features.</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]62
63
64<h2>URI Security</h2>
65
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]66<p>CodeIgniter is fairly restrictive regarding which characters it allows in your URI strings in order to help
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]67minimize the possibility that malicious data can be passed to your application. URIs may only contain the following:
68</p>
69
70<ul>
71<li>Alpha-numeric text</li>
72<li>Tilde: ~ </li>
73<li>Period: .</li>
74<li>Colon: :</li>
75<li>Underscore: _</li>
76<li>Dash: -</li>
77</ul>
78
79<h2>GET, POST, and COOKIE Data</h2>
80
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]81<p>GET data is simply disallowed by CodeIgniter since the system utilizes URI segments rather than traditional URL query strings (unless
admine334c472006-10-21 19:44:22 +0000[diff] [blame]82you have the query string option enabled in your config file). The global GET
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]83array is <strong>unset</strong> by the Input class during system initialization.</p>
84
85<h2>Register_globals</h2>
86
87<p>During system initialization all global variables are unset, except those found in the $_POST and $_COOKIE arrays. The unsetting
88routine is effectively the same as register_globals = off.</p>
89
90
91<h2>magic_quotes_runtime</h2>
92
93<p>The magic_quotes_runtime directive is turned off during system initialization so that you don't have to remove slashes when
94retrieving data from your database.</p>
95
admin78ce3cc2006-10-02 02:58:03 +0000[diff] [blame]96<h1>Best Practices</h1>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]97
admine334c472006-10-21 19:44:22 +0000[diff] [blame]98<p>Before accepting any data into your application, whether it be POST data from a form submission, COOKIE data, URI data,
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]99XML-RPC data, or even data from the SERVER array, you are encouraged to practice this three step approach:</p>
100
101<ol>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]102<li>Filter the data as if it were tainted.</li>
103<li>Validate the data to ensure it conforms to the correct type, length, size, etc. (sometimes this step can replace step one)</li>
104<li>Escape the data before submitting it into your database.</li>
105</ol>
106
Derek Allardce66d152008-03-04 20:55:55 +0000[diff] [blame]107<p>CodeIgniter provides the following functions to assist in this process:</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]108
109<ul>
110
111<li><h2>XSS Filtering</h2>
112
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]113<p>CodeIgniter comes with a Cross Site Scripting filter. This filter looks for commonly
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]114used techniques to embed malicious Javascript into your data, or other types of code that attempt to hijack cookies
admine334c472006-10-21 19:44:22 +0000[diff] [blame]115or do other malicious things. The XSS Filter is described <a href="../libraries/input.html">here</a>.
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]116</p>
117</li>
118
119<li><h2>Validate the data</h2>
120
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]121<p>CodeIgniter has a <a href="../libraries/validation.html">Validation Class</a> that assists you in validating, filtering, and prepping
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]122your data.</p>
123</li>
124
125<li><h2>Escape all data before database insertion</h2>
126
127<p>Never insert information into your database without escaping it. Please see the section that discusses
admin58083462006-09-24 17:58:27 +0000[diff] [blame]128<a href="../database/queries.html">queries</a> for more information.</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]129
130</li>
131
132</ul>
133
134
135
136
137</div>
138<!-- END CONTENT -->
139
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142<p>
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Derek Allardc6441282007-07-04 23:54:32 +0000[diff] [blame]148</p>
Derek Jones07870432008-02-13 03:49:26 +0000[diff] [blame]149<p><a href="http://codeigniter.com">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2006-2008 &nbsp;&middot;&nbsp; <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
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