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What Are Proxy Servers And Why Use Them
Following Wikipedia description, “a proxy server is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource available from a different server and the proxy server evaluates the request as a way to simplify and control its complexity“. A descriptive picture is also showed in the same page:
Proxy server are useful in many contexts:
- in Office context: to control internet traffic by blocking some websites or some keywords, to manage contact with external internet from a single point or to optimize internet bandwidth usage by caching pages at proxy level
- in Home context: for example to control family internet access to block dangerous websites for childrens
- in Personal use context: for example to use an anonymous connection or to bypass network ISP blocks
What We Need
As usual, I suggest adding from now to your favourite ecommerce shopping chart all needed hardware, so that at the end you will be able to evaluate overall costs and decide if continuing with the project or removing them from shopping chart. So, hardware will be only:
- Raspberry Pi Zero W (including proper power supply or using a smartphone micro usb charger with at least 3A)
- micro SD card (at least 16 GB, at least class 10)
Following picture summarizes the procedure:
In this guide we are going to use default Raspbian Buster Lite as OS. Then we’ll install Squid (the most popular open source Proxy) and configure it.
I’ll configure Squid to manage access for all clients on a 192.168.1.0/24 private network to internet. You will need to modify this network depending on your needs and networking configurations.
Install OS And Squid
Start from a fresh Raspbian Buster Lite installation.
Make sure you OS is updated:
sudo apt-get update sudo apt-get upgrade
Simply install Squid by using Raspbian repository:
sudo apt-get install squid
At installation end, check that squid service is active:
sudo systemctl status squid.service
and you should see the following:
● squid.service – Squid Web Proxy Server
Loaded: loaded (/lib/systemd/system/squid.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2019-09-29 11:46:06 BST; 1min 39s ago
Main PID: 5481 (squid)
├─5481 /usr/sbin/squid -sYC
├─5483 (squid-1) –kid squid-1 -sYC
├─5486 (logfile-daemon) /var/log/squid/access.log
Squid file and locations you should be aware of are:
- Squid configuration file: /etc/squid/squid.conf
- Squid Access log: /var/log/squid/access.log
- Squid Cache log: /var/log/squid/cache.log
Edit configuration file:
sudo nano /etc/squid/squid.conf
in this file I’ll leave the default port used from clients to use proxy. If you want to change it, identify and edit the following line:
to restrict networks allowed to use squid proxy, I will comment all lines starting with “acl localnet src” just by adding an ashtag (#) at the start of line. I’m going to allow my network by typing the following configuration line:
acl localnet src 192.168.1.0/24
Finally identify default rule which is blocking http access:
http_access deny all
and change it to:
http_access allow all
to start using your Squid proxy server.
Close and save the file. Restart Squid service:
sudo systemctl restart squid.service
Configure Your Client To Use Proxy Server
Now you need to configure you client to use proxy server for internet connections. You have to check this depending on your client OS. For example, on Windows clients you should go on Settings -> Network & Internet -> Proxy. Move On “Use a proxy server” switch and insert your RPI IP address in address field and 3128 in port field.
Close and open again your browser. Now you are using your Squid proxy.