Ubuntu 26.04

How to Install Squid on Ubuntu 26.04

To install Squid on Ubuntu 26.04, listen on 3128 with basic auth. Change 104.248.238.191 to this server's public IP.

Step 1 : Update.

sudo apt update

Step 2 : Install Squid and htpasswd.

sudo apt install squid apache2-utils

Step 3 : Check status.

sudo systemctl status squid

Step 4 : Create proxyuser and set a password.

sudo htpasswd -c /etc/squid/passwd proxyuser
sudo chown proxy:proxy /etc/squid/passwd
sudo chmod 640 /etc/squid/passwd

Step 5 : include conf.d is read before deny all. Do not use allow localnet or allow all.

sudo tee /etc/squid/conf.d/auth.conf <<'EOF'
auth_param basic program /usr/lib/squid/basic_ncsa_auth /etc/squid/passwd
auth_param basic realm Squid proxy
auth_param basic credentialsttl 2 hours
acl authenticated proxy_auth REQUIRED
http_access allow authenticated
EOF

Step 6 : Allow the proxy port.

sudo ufw allow 3128/tcp

Step 7 : Restart.

sudo systemctl restart squid

Step 8 : From the client (another network). Change 104.248.238.191 to this server's public IP. Put the password from step 4 in the proxy URL.

curl -4 -s -x http://proxyuser:strong_password@104.248.238.191:3128 http://icanhazip.com

Restrict port 3128 in the cloud firewall to your client. Basic auth is not a reason to publish an open proxy on the internet.

You have installed Squid on Ubuntu 26.04.