How to configure Squid to work with a SquidGuard for URL filtering?

Heya,

Here’s a basic guide on how you can integrate Squid and SquidGuard.

First, let’s configure Squid to use SquidGuard.

Open the Squid configuration file. It’s typically located at /etc/squid/squid.conf.

sudo nano /etc/squid/squid.conf

Add the following lines to the file. This will tell Squid to use SquidGuard as a URL rewriter:

url_rewrite_program /usr/bin/squidGuard

Next, let’s configure SquidGuard.

Open the SquidGuard configuration file. It’s typically located at /etc/squidguard/squidGuard.conf.

sudo nano /etc/squidguard/squidGuard.conf

In this file, you can define access control lists (ACLs) and redirect rules. Here’s an example configuration:

dbhome /var/lib/squidguard/db
logdir /var/log/squidguard

dest block {
  domainlist block/domains
  urllist block/urls
}

acl {
  default {
    pass !block all
    redirect http://localhost/block.html
  }
}

This configuration blocks the domains and URLs listed in the block/domains and block/urls files. All blocked requests are redirected to http://localhost/block.html.

Create the block blacklist and populate the domains and urls files:

sudo mkdir /var/lib/squidguard/db/block
echo "badwebsite.com" | sudo tee /var/lib/squidguard/db/block/domains
echo "badurl.com/badcontent" | sudo tee /var/lib/squidguard/db/block/urls

Update SquidGuard’s blacklist database:

sudo squidGuard -C all -d

Change the ownership of the SquidGuard db directory to the proxy user (usually proxy or squid):

sudo chown -R proxy:proxy /var/lib/squidguard/db
sudo systemctl restart squid

That’s it! Now, Squid should be using SquidGuard for URL filtering. Remember to replace "badwebsite.com" and "badurl.com/badcontent" with the actual domains and URLs you want to block. Also, replace "http://localhost/block.html" with the actual URL where you host your block page.