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| <td><h1>Code Igniter User Guide Version 1.5.0b3</h1></td> | |
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| <h1>Security</h1> | |
| <p>This page describes some "best practices" regarding web security, and details | |
| Code Igniter's internal security features.</p> | |
| <h2>URI Security</h2> | |
| <p>Code Igniter is fairly restrictive regarding which characters it allows in your URI strings in order to help | |
| minimize the possibility that malicious data can be passed to your application. URIs may only contain the following: | |
| </p> | |
| <ul> | |
| <li>Alpha-numeric text</li> | |
| <li>Tilde: ~ </li> | |
| <li>Period: .</li> | |
| <li>Colon: :</li> | |
| <li>Underscore: _</li> | |
| <li>Dash: -</li> | |
| </ul> | |
| <h2>GET, POST, and COOKIE Data</h2> | |
| <p>GET data is simply disallowed by Code Igniter since the system utilizes URI segments rather than traditional URL query strings (unless | |
| you have the query string option enabled in your config file). The global GET | |
| array is <strong>unset</strong> by the Input class during system initialization.</p> | |
| <h2>Register_globals</h2> | |
| <p>During system initialization all global variables are unset, except those found in the $_POST and $_COOKIE arrays. The unsetting | |
| routine is effectively the same as register_globals = off.</p> | |
| <h2>magic_quotes_runtime</h2> | |
| <p>The magic_quotes_runtime directive is turned off during system initialization so that you don't have to remove slashes when | |
| retrieving data from your database.</p> | |
| <h1>Best Practices</h1> | |
| <p>Before accepting any data into your application, whether it be POST data from a form submission, COOKIE data, URI data, | |
| XML-RPC data, or even data from the SERVER array, you are encouraged to practice this three step approach:</p> | |
| <ol> | |
| <li>Filter the data as if it were tainted.</li> | |
| <li>Validate the data to ensure it conforms to the correct type, length, size, etc. (sometimes this step can replace step one)</li> | |
| <li>Escape the data before submitting it into your database.</li> | |
| </ol> | |
| Code Igniter provides the following functions to assist in this process:</p> | |
| <ul> | |
| <li><h2>XSS Filtering</h2> | |
| <p>Code Igniter comes with a Cross Site Scripting filter. This filter looks for commonly | |
| used techniques to embed malicious Javascript into your data, or other types of code that attempt to hijack cookies | |
| or do other malicious things. The XSS Filter is described <a href="../libraries/input.html">here</a>. | |
| </p> | |
| </li> | |
| <li><h2>Validate the data</h2> | |
| <p>Code Igniter has a <a href="../libraries/validation.html">Validation Class</a> that assists you in validating, filtering, and prepping | |
| your data.</p> | |
| </li> | |
| <li><h2>Escape all data before database insertion</h2> | |
| <p>Never insert information into your database without escaping it. Please see the section that discusses | |
| <a href="../database/queries.html">queries</a> for more information.</p> | |
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