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183 lines
8.9 KiB
183 lines
8.9 KiB
<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>Chamilo Security Guide</title>
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<link rel="stylesheet" href="../../build/legacy_app.css" />
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<link rel="stylesheet" href="../../build/app.css" />
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<link rel="stylesheet" href="../../build/vue.css" />
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<link rel="stylesheet" href="default.css" />
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<script src="../../build/legacy_app.js"></script>
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</head>
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<body>
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<div class="container">
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<h1>Chamilo LMS: Security Guide</h1>
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<a href="index.html">Documentation</a> > Security Guide
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<p>We recommend you don't take security issues too lightly. Chamilo is security-audited at least once a year,
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but you're never too sure. This list is a work in progress. Feel free to recommend additional measures by
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sending us an e-mail at info@chamilo.org.</p>
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<h2><b>Contents</b></h2>
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<ol>
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<li><a href="#1.Disclosing-server-info">Disclosing server info</a></li>
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<li><a href="#2.Keeping-up-to-date">Keeping up to date</a></li>
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<li><a href="#3.Using-safe-browsers">Using safe browsers</a></li>
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<li><a href="#4.Moving-config-file">Moving your configuration file out of the web directory</a></li>
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<li><a href="#5.Files-permissions">Restricting files permissions</a></li>
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<li><a href="#6.HSTS">HTTP Headers Security</a></li>
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</ol>
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<h2><a id="1.Disclosing-server-info"></a>1. Disclosing server info</h2>
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<p>
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It is considered a safer behaviour not to disclose server information from your Chamilo page. In order to avoid
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both web server and PHP information disclosure, you might want to take the following actions:
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</p>
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<ul>
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<li>Locate the <i>ServerTokens</i> setting inside your Apache configuration and set it to "Prod"</li>
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<li>Locate the <i>ServerSignature</i> setting inside your Apache configuration and set it to "Off"</li>
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<li>Locate the <i>expose_php</i> setting inside your PHP configuration and set it to "Off"</li>
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<li>Reload Apache</li>
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</ul>
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<h2><a id="2.Keeping-up-to-date"></a>2. Keeping up to date</h2>
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<p>
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Make sure you check <a href="http://support.chamilo.org/projects/chamilo-18/wiki/Security_issues">our security
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issues page</a> from time to time.
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Subscribe to our free security alerts mailing-list:
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<a href="http://lists.chamilo.org/listinfo/security">http://lists.chamilo.org/listinfo/security</a> or that you
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follow our security Twitter feed: <a href="http://twitter.com/chamilosecurity">http://twitter.com/chamilosecurity</a>.
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</p>
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<h2><a id="3.Using-safe-browsers"></a>3. Using safe browsers</h2>
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<p> Additionally to lacking the implementation of features that really improve the quality of your browsing the
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Internet, older browsers tend to have many unresolved security flaws. Using an old browser, you put in danger the
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security of your computer and the data it contains, but you can also put others in danger by letting crackers take
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control of it and attacking others.</p>
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<p>To avoid being a risk to yourself and others, you should download and install a recent browser. We recommend
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<a href="http://www.getfirefox.com" target="_blank">the latest stable version of Firefox</a>.</p>
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<h2><a id="4.Moving-config-file"></a>4. Moving your configuration file out of the web directory</h2>
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<p>It is considered unsafe to leave the configuration file inside the app/config/ directory, as it will be directly
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accessible for all users, which could lead crackers to download it, uninterpreted, and read through your
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configuration, which could lead to illicit
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access to your database if that one isn't well protected and many other stuff we'd prefer to avoid. To secure it,
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move the configuration file out of your web directory. If your Chamilo installation is in /var/www/, move your
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configuration to /etc/chamilo/configuration.php, for example. Then create a new app/config/configuration.php
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file, open it, and write the following:</p>
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<pre>
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<?php
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require '/etc/chamilo/configuration.php';
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</pre>
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<p>
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This will prevent direct access to your settings and make it seem totally the same to Chamilo.
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</p>
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<h2><a id="5.Files-permissions"></a>5. Restricting files permissions</h2>
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<p>Making all the Chamilo files world-writable will help you install quickly, and it solves many
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issues for people without much admin experience. However, it's more
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secure to make a distinct user owner of all the chamilo files and folders,
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and only give read access to the web server to all files, and write access
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only to the directories previously mentioned.</p>
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<p>This way, these files need
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only be readable and writable by the Apache process owner, not by the
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entire world. It would also be advisable to make all writable directory
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refuse the interpretation of PHP files (except for the root of the courses
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directories).</p>
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<p>Don't hesitate to hire an experienced administrator to do that,
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it might be a bit more expensive now, but you'll be happy not to have to loose
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all of your data to a hacker who attacked your site.</p>
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<p>Only the following directories have required (or optional) write
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permissions from the web server:<br />
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<ul>
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<li>app/cache/</li>
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<li>app/courses/</li>
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<li>app/home/</li>
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<li>app/logs/</li>
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<li>app/upload/</li>
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<li>main/default_course_document/images/</li>
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<li>main/lang/ (optional, only for sublanguages)</li>
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<li>web/css/ (optional, only for switching CSS through the web)</li>
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</ul>
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<br />
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Because these directories have "write by the web server" permissions,
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it is important to prevent the execution of PHP scripts from those
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directories (because a specially-crafted attack could end up allowing
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the upload of a PHP script to one of these). To do that, taking into
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account we authorize overrides through .htaccess, we need to set
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something that a .htaccess file cannot revert, and we need to set it
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for each of those directories. This can be done as follows inside
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your VirtualHost definition in Apache, where "/var/www/URL/" is the path of your VirtualHost web root:<br />
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<pre>
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<Directory /var/www/URL/app/cache>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/app/courses>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/app/home>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/app/logs>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/app/upload>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/app/Resources/public/css>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/main/default_course_document/images>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/main/lang>
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php_admin_value engine Off
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</Directory>
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<Directory /var/www/URL/web/css>
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php_admin_value engine Off
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</Directory>
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</pre>
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For Nginx, this would look like the following rules. However, do
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remember that Nginx interprets rules in order of appearance, so these
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rules would have to be at the top of your location rules to take the
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highest priority:
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<pre>
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location ~ ^/app/(cache|courses|home|logs|upload|Resources/public/css)/.*\.ph(p[3457]?|t|tml|ar)$ {
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deny all;
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}
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location ~ ^/main/default_course_document/images/.*\.ph(p[3457]?|t|tml|ar)$ {
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deny all;
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}
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location ~ ^/main/lang/.*\.ph(p[3457]?|t|tml|ar)$ {
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deny all;
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}
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location ~ ^/web/css/.*\.ph(p[3457]?|t|tml|ar)$ {
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deny all;
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}
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</pre>
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<br />
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<hr />
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<h2><a id="6.HSTS">HTTP Headers Security</a></h2>
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<p>A relatively recent development in web security, HTTP headers can be modified either
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from the web server or from the application (like Chamilo) to increase the security
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of your visitors.</p>
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<p>These implies several aspects, from simple to complex, to deal with, from stuff like
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indicating which websites you say media or libraries can be loaded from, to adding
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extra info about your SSL certificate to make sure a hacked certification authority
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will not immediately make your certificate useless.</p>
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<p>In Chamilo 1.11.6, we have added several parameters, together with recommendations,
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to main/install/configuration.dist.php, that you are free to use or ignore,
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depending on the level of security you want to achieve.</p>>
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<p>To check your portal for possible improvements in terms of headers security,
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we highly recommend the <a href="https://securityheaders.io/">securityheaders.io</a>
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website. If you want to read more about CSP and all related headers
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security techniques, check <a href="https://scotthelme.co.uk/">Scott Helme's blog</a>.
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<h2>Authors</h2>
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<ul>
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<li>Yannick Warnier, Zend Certified PHP Engineer, BeezNest Belgium SPRL,
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<a href="mailto:yannick.warnier@beeznest.com">yannick.warnier@beeznest.com</a></li>
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</ul>
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</div>
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</body>
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</html>
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