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GNU/Linux UFW VPN kill switch tutorial

This is a quick guide for setting up a kill switch using UFW (Uncomplicated FireWall). It is assumed you are using OpenVPN and optionally Network-Manager with network-manager-openvpn.

1. (Optional) IP Addresses

Before we can start we're going to need the IP address (or the IP addresses) of your VPN so that we can whitelist those later on, write them down. They are obviously going to be different for every VPN and VPNs with multiple servers, so I'll leave this up to you.

2. Install UFW

On some systems UFW is installed and enabled by default (Ubuntu, for example). Installation procedure is going to be different for every distribution of GNU/Linux, but it's usually something like

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import { at } from 'lodash'

Vue.prototype.$t = function (translationKey, options) {
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  let translation = rawTranslation[0]

  for (let key in options) {
    translation = translation.replace(`%{${key}}`, options[key])
  }

defaye

mkdir aws_cli_installation_temp
cd aws_cli_installation_temp
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install
cd ..
rm -rf aws_cli_installation_temp

defaye

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# adapted from https://deanpcmad.com/2022/installing-older-ruby-versions-on-ubuntu-22-04/
mkdir ~/.openssl
wget https://www.openssl.org/source/openssl-1.1.1g.tar.gz
tar zxvf openssl-1.1.1g.tar.gz
cd openssl-1.1.1g
./config --prefix=/home/$USER/.openssl/openssl-1.1.1g --openssldir=/home/$USER/.openssl/openssl-1.1.1g
make
make test
make install
rm -rf ~/.openssl/openssl-1.1.1g/certs

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swap_pg_version() {
    if [ $# -ne 1 ]; then
        echo "Usage: swap_pg_version <version>"
        return 1
    fi

    TARGET_VERSION="postgresql@$1"
    
    # List all installed PostgreSQL versions
    INSTALLED_VERSIONS=$(brew list --formula | grep 'postgresql@')

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open_coverage_report() {
    # Find the coverage/index.html file, excluding node_modules and prioritizing higher-level directories
    local file=$(find . -type d -name "node_modules" -prune -o -type f -name "index.html" -path "*/coverage/*" -print | head -n 1)

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        # Open the file in the default browser or Firefox if the default is not set
        open -a "Firefox" "$file" || open "$file"
    else
        echo "No coverage/index.html file found in the current directory or its subdirectories."