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Derek Jones8917af72010-03-05 12:41:45 -0600[diff] [blame]31<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]32<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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43<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
44<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
45Security
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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>
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57
58<h1>Security</h1>
59
60<p>This page describes some "best practices" regarding web security, and details
61CodeIgniter's internal security features.</p>
62
63
64<h2>URI Security</h2>
65
66<p>CodeIgniter is fairly restrictive regarding which characters it allows in your URI strings in order to help
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
81<p>GET data is simply disallowed by CodeIgniter since the system utilizes URI segments rather than traditional URL query strings (unless
82you have the query string option enabled in your config file). The global GET
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
96<h1>Best Practices</h1>
97
98<p>Before accepting any data into your application, whether it be POST data from a form submission, COOKIE data, URI data,
99XML-RPC data, or even data from the SERVER array, you are encouraged to practice this three step approach:</p>
100
101<ol>
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
107<p>CodeIgniter provides the following functions to assist in this process:</p>
108
109<ul>
110
111<li><h2>XSS Filtering</h2>
112
113<p>CodeIgniter comes with a Cross Site Scripting filter. This filter looks for commonly
114used techniques to embed malicious Javascript into your data, or other types of code that attempt to hijack cookies
Derek Jones9898b892010-03-10 14:04:17 -0600[diff] [blame]115or do other malicious things. The XSS Filter is described <a href="../libraries/security.html">here</a>.
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]116</p>
117</li>
118
119<li><h2>Validate the data</h2>
120
121<p>CodeIgniter has a <a href="../libraries/form_validation.html">Form Validation Class</a> that assists you in validating, filtering, and prepping
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
128<a href="../database/queries.html">queries</a> for more information.</p>
129
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Derek Jonesd6d70e32010-03-29 10:10:27 -0500[diff] [blame]149<p><a href="http://codeigniter.com">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2006-2010 &nbsp;&middot;&nbsp; <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]150</div>
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