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How to Setup Transparent Squid Proxy Server in Ubuntu

Squid is a fully-featured HTTP/1.0 proxy. Squid offers a rich access control, authorization and logging environment to develop web proxy and content serving applications.

This is a short guide on how to set up a transparent squid proxy server. Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator.

Install Squid

Install squid and squid-common

sudo aptitude install squid squid-common

Edit the squid config file.

sudo vi /etc/squid/squid.conf

Set the allowed hosts.

acl internal_network src 192.168.0.0/24 http_access allow internal_network

Note: Where "192.168.0.0/24" is your IP range.

Set the correct permissions.

sudo chown -R proxy:proxy /var/log/squid/ sudo chown proxy:proxy /etc/squid/squid.conf

You will need to restart squid for the changes to take affect.

sudo /etc/init.d/squid restart

Now open up your browser and set your proxy to point to your new squid server on port 3128. Use WPAD for automatic configuration.

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Block Malware sites with Squid

Download the malware list from malware.hiperlinks.com.br:

wget -O - http://malware.hiperlinks.com.br/cgi/submit?action=list_squid > /etc/squid/malware_block_list.txt

Add the following lines to /etc/squid/squid.conf

# File which contains the list acl malware_block_list url_regex-i "/etc/squid/malware_block_list.txt" # Access Denied http_access deny malware_block_list # Redirect message - (You can make your own) deny_info http://malware.hiperlinks.com.br/denied.shtml malware_block_list

Add the following to your crontab:

* 00,06 * * * wget -O - http://malware.hiperlinks.com.br/cgi/submit?action=list_squid > /etc/squid/malware_block_list.txt

Reload squid configuration using one (1) of the lines below:

service squid reload /etc/init.d/squid reload squid -k reconfigure

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