#!/bin/sh

apt upgrade || exit 10
apt install -y tmux ufw || exit 15

sed -i '/PubkeyAuthentication/c\PubkeyAuthentication yes' /etc/ssh/sshd_config
sed -i '/PasswordAuthentication/c\PasswordAuthentication no' /etc/ssh/sshd_config
sed -i '/PermitRootLogin/c\PermitRootLogin prohibit-password' /etc/ssh/sshd_config
systemctl restart sshd

ufw allow ssh || exit 20
yes | ufw enable