Configure Squid Proxy in Redhat Linux/CentOS | Restrict Websites, Hours, Files & Downloads by Squid

Squid Proxy Server:
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Squid is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching web, DNS and other computer network lookups for a group of people sharing network resources, and aiding security by filtering traffic. Although primarily used for HTTP and FTP, Squid includes limited support for several other protocols including Internet Gopher, SSL,[6] TLS and HTTPS. Squid does not support the SOCKS protocol, unlike Privoxy, with which Squid can be used in order to provide SOCKS support.

(Credits: wikipedia.com)

Configure Squid Proxy Server in Redhat Enterprise Linux 7/8:
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1. Login in server as the root user and configure local yum repository if not configured earlier.
yum repolist
(if you don't know how to configure it, you can watch our videos by clicking on links provided below.)

Yum configure in RHEL 7:
   • Configure Local Yum Repository in RHE...  

Yum configure in RHEL 8:
   • Configure Local DNF / YUM Repository ...  

2. Now install squid packages from yum repository in the server.
yum install -y squid*

3. Start the squid service and enable it.
systemctl start squid
systemctl enable squid

4. Add the squid port in firewall and restart it.
firewall-cmd --permanent --add-port=3128/tcp
firewall-cmd --reload

5. Note down your server local ip address.
ifconfig

6. Now make chages in the configuration file of squid as shown below.
vim /etc/squid/squid.conf
acl localnet src 192.168.1.10/24
http_access allow localnet

7. If you want to block some of the specific website in your LAN then make the entry of blocksites file in squid configuration file.
vim /etc/squid/squid.conf
acl blocksites url_regex "/etc/squid/blocksites"
http_access deny blocksites

Make the entry of block sites in /etc/squid/blocksites to block the sites.
vim /etc/squid/blocksites

.facebook.com
.twitter.com
.flipkart.com

8. Restart the squid service.
systemctl restart squid

9. Now open firefox and make required changes.
firefox
Firefox -) Settings -) Preferences -) Advance -) Network -) Connections -) Select Manual Proxy Conf -) Provide the IP of your server which you have noted down & Port Number (3128).

10. Open firefox and test whether caching imporves your surffing experience & whether you can still access the blocked sites or not?
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You can also block files with the help of squid servers.
Make rules for the same in configuration file.
vim /etc/squid/squid.conf
acl blockfiles urlpath_regex "/etc/squid/blockfiles.acl"
http_access deny blockfiles

Now open /etc/squid/blockfiles.acl in vi editor and make an entry for the files to be blocked.
\.torrent$
\.mp3.*$
\.3gp.*$
\.mp4.*$
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Set work hours.
vim /etc/squid/squid.conf
acl work_hours time 10:00-19:00
http_access deny work_hours

Set download speed.
vim /etc/squid/squid.conf
acl speedcontrol src 192.168.1.109/24
delay_pools 1
delay_class 1 2
delay_parameters 1 524288/524288 52428/52428
delay_access 1 allow speedcontrol

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