In previous posts we discussed how to install Squid + squidGuard and how to configure squid to properly handle or restrict access requests. Please make sure you go over those two tutorials and install both Squid and squidGuard before proceeding as they set the background and the context for what we will cover in this post: integrating squidguard in a working squid environment to implement blacklist rules and content control over the proxy server. Requirements • • What Can / Cannot I use SquidGuard For?

Though squidGuard will certainly boost and enhance Squid’s features, it is important to highlight what it can and what it cannot do. SquidGuard can be used to: • limit the allowed web access for some users to a list of accepted/well known web servers and/or URLs only, while denying access to other blacklisted web servers and/or URLs.

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• block access to sites (by IP address or domain name) matching a list of regular expressions or words for some users. • require the use of domain names/prohibit the use of IP address in URLs. • redirect blocked URLs to error or info pages. • use distinct access rules based on time of day, day of the week, date etc.

• implement different rules for distinct user groups. However, neither squidGuard nor Squid can be used to: • analyze text inside documents and act in result.

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• detect or block embedded scripting languages like JavaScript, Python, or VBscript inside HTML code. BlackLists – The Basics Blacklists are an essential part of squidGuard. Basically, they are plain text files that will allow you to implement content filters based on specific keywords. There are both freely available and commercial blacklists, and you can find the download links in the project’s website. In this tutorial I will show you how to integrate the blacklists provided by to your squidGuard installation. These blacklists are free for personal / non-commercial use and are updated on a daily basis. They include, as of today, over 1,700,000 entries.

For our convenience, let’s create a directory to download the blacklist package. # mkdir /opt/3rdparty # cd /opt/3rdparty # wget The latest download link is always available as highlighted below. SquidGuard Blacklist Urls Domains Installing Blacklists Installation of the whole blacklist package, or of individual categories, is performed by copying the BL directory, or one of its subdirectories, respectively, to the /var/lib/squidguard/db directory. Of course you could have downloaded the blacklist tarball to this directory in the first place, but the approach explained earlier gives you more control over what categories should be blocked (or not) at a specific time. Next, I will show you how to install the anonvpn, hacking, and chat blacklists and how to configure squidGuard to use them. Step 1: Copy recursively the anonvpn, hacking, and chat directories from /opt/3rdparty/BL to /var/lib/squidguard/db. # cp -a /opt/3rdparty/BL/anonvpn /var/lib/squidguard/db # cp -a /opt/3rdparty/BL/hacking /var/lib/squidguard/db # cp -a /opt/3rdparty/BL/chat /var/lib/squidguard/db Step 2: Use the domains and urls files to create squidguard’s database files.

Please note that the following command will work for creating.db files for all the installed blacklists – even when a certain category has 2 or more subcategories. # squidGuard -C all Step 3: Change the ownership of the /var/lib/squidguard/db/ directory and its contents to the proxy user so that Squid can read the database files. # chown -R proxy:proxy /var/lib/squidguard/db/ Step 4: Configure Squid to use squidGuard. We will use Squid’s url_rewrite_program directive in /etc/squid/squid.conf to tell Squid to use squidGuard as a URL rewriter / redirector. Add the following line to squid.conf, making sure that /usr/bin/squidGuard is the right absolute path in your case. # which squidGuard # echo 'url_rewrite_program $(which squidGuard)' >> /etc/squid/squid.conf # tail -n 1 /etc/squid/squid.conf.