Squid is the most popular Proxy server for Unix-like operating systems. It is also used for web filtering. Squid also useful as caching proxy server for the HTTP, HTTPS, and FTP protocols.
This article will help you to set up Squid Proxy Server on Ubuntu 18.10, 18.04 LTS, 16.04 LTS, and 14.04 LTS systems.
Step 1 – Install Package
Squid packages are available in default yum repositories. Execute the below command on your server to install the SQUID proxy server.
sudo apt update sudo apt install squid
Step 2 – Configure Squid Port
The default port for the Squid proxy servers is 3128. You can change this as per the requirements. To set up Squid on different port, Edit squid configuration file and change http_port value with new port.
After making changes let’s restart the Squid service to reload the configuration changes
sudo service squid restart
The next steps will help you to set up Squid Proxy Server on Ubuntu systems. Use only those settings, which is required for your proxy server.
Step 3 – Allow All Traffic
Sometimes you are required to allow all traffic on your proxy server. In Squid server open Squid configuration file. Comment the http_access deny all line and add the http_access allow all entry this file.
http_access allow all #http_access deny all
Step 4 – Block Specific Website with Squid
Let’s start with the additional configuration like blocking any website using a squid proxy server. Add below rules to block specific websites before any allow all rules. The below example will block yahoo.com and www.rediff.com.
acl blocksite1 dstdomain yahoo.com acl blocksite2 dstdomain www.rediff.com http_access deny blocksite1 http_access deny blocksite2
If you have a long list of domain names, Create a file /etc/squid/blockwebsites.lst and put domain names one per line and add the below rule in the squid configuration file.
acl blocksitelist dstdomain "/etc/squid/blockwebsites.lst" http_access deny blocksitelist
blockwebsites.lst file content example:
cat /etc/squid/blockwebsites.lst yahoo.com www.rediff.com
Step 5 – Block Specific Keyword with Squid
Add below rules to block specific websites before any allow all rules. The below example will block all pages having the keyword yahoo or Gmail.
acl blockkeyword1 url_regex yahoo acl blockkeyword2 url_regex gmail http_access deny blockkeyword1 http_access deny blockkeyword2
If you have a long list of keywords, Create a file /etc/squid/blockkeywords.lst and put keywords one per line and add the below rule in the squid configuration file.
acl blockkeywordlist url_regex "/etc/squid/blockkeywords.lst" http_access deny blockkeywordlist
blockkeywords.lst file content example:
cat /etc/squid/blockkeywords.lst yahoo gmail facebook
Congratulation’s you have successfully install and configured Squid proxy server. Read next article to Configure Squid for Mac Address Based Filtering.