initial bash based debian vps bootstrapper

debian-vps-boostrap/vps_bootstrap.sh

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+#!/bin/bash
+
+########################
+# Missing ohmyzsh
+########################
+
+clear
+
+# Set variable holding the Debian version codename
+DEBIAN_VERSION="bookworm"
+DOCKER_USER="docker-user"
+SYSTEM_HOSTNAME="vps02.carlossousa.tech"
+SSH_PUBLIC_KEY="ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDW0ryhGvQwtXEQvP2+RV4PanS+TahMTj98WQqH0Dpe8 contabo-vps-m-me@carlosousa.tech"
+
+
+# Create custom_sources file with deb and deb-src entries
+cat <<EOF > /etc/apt/sources.list.d/custom_sources.list
+# Main
+deb http://deb.debian.org/debian/ $DEBIAN_VERSION main contrib non-free
+deb-src http://deb.debian.org/debian/ $DEBIAN_VERSION main contrib non-free
+
+# Security
+#deb http://deb.debian.org/debian/ ${DEBIAN_VERSION}-security main contrib non-free
+#deb-src http://deb.debian.org/debian/ ${DEBIAN_VERSION}-security main contrib non-free
+
+# Backports
+deb http://deb.debian.org/debian/ ${DEBIAN_VERSION}-backports main contrib non-free
+deb-src http://deb.debian.org/debian/ ${DEBIAN_VERSION}-backports main contrib non-free
+
+# Updates
+deb http://deb.debian.org/debian/ ${DEBIAN_VERSION}-updates main contrib non-free
+deb-src http://deb.debian.org/debian/ ${DEBIAN_VERSION}-updates main contrib non-free
+
+# Sid (the Unstable Distribution)
+deb http://deb.debian.org/debian/ sid main
+deb-src http://deb.debian.org/debian/ sid main
+EOF
+
+
+cat <<EOF > /etc/apt/preferences.d/custom_preferences
+# Package pinning to prefer stable, then unstable, then testing
+
+# Stable packages get the highest priority
+Package: *
+Pin: release a=stable
+Pin-Priority: 900
+
+# Unstable packages get medium priority
+Package: *
+Pin: release a=unstable
+Pin-Priority: 600
+
+# Testing packages get the lowest priority
+Package: *
+Pin: release a=testing
+Pin-Priority: 300
+EOF
+
+# Stop script if any command returns a non-zero status
+set -e
+
+
+# Set Hostname
+hostnamectl set-hostname "$SYSTEM_HOSTNAME"
+
+
+# Check for updates and update the system using apt
+apt update -y
+apt upgrade -y
+
+
+# Info: if some package can't be installed due to missing dependencies (eg: package is from unstable, but stable has a lower dependency version only)
+#   apt install -t unstable <dependency>
+
+# Install Packages
+apt install \
+    btop \
+    curl \
+    docker \
+    docker-compose \
+    duf \
+    fail2ban \
+    fastfetch \
+    fzf \
+    git \
+    ncdu \
+    neovim \
+    rsync \
+    sudo \
+    tmux \
+    vim \
+    wget \
+    zsh \
+    -y
+
+# Docker Setup
+if ! getent group docker > /dev/null 2>&1; then
+  groupadd docker
+fi
+
+if ! id "$DOCKER_USER" > /dev/null 2>&1; then
+  useradd -m "$DOCKER_USER"
+fi
+
+su -c "mkdir -p /home/$DOCKER_USER/.ssh" - $DOCKER_USER
+su -c "chmod 700 /home/$DOCKER_USER/.ssh" - $DOCKER_USER
+
+auth_keys="/home/$DOCKER_USER/.ssh/authorized_keys"
+su -c "touch $auth_keys" - $DOCKER_USER
+su -c "cat <<EOF > $auth_keys
+$SSH_PUBLIC_KEY
+EOF
+" - $DOCKER_USER
+
+su -c "chmod 600 $auth_keys" - $DOCKER_USER
+
+
+usermod -aG docker "$DOCKER_USER"
+usermod -aG sudo "$DOCKER_USER"
+
+# Fail2Ban Setup
+cat <<EOF > /etc/fail2ban/fail2ban.local
+[DEFAULT]
+allowipv6 = auto
+EOF
+
+cat <<EOF > /etc/fail2ban/jail.local
+[DEFAULT]
+# Debian 12 has no log files, needs to use journalctl
+backend = systemd
+
+# Configure nftables
+banaction = nftables-multiport
+chain = input
+banaction_allports = nftables[type=allports]
+
+# Regular Banning
+bantime = 24h
+findtime = 600
+maxretry = 5
+
+bantime.increment = true
+bantime.rndtime = 30m
+
+
+dbpurgeage = 30d
+
+[sshd]
+enabled = true
+mode = aggressive
+backend = systemd
+maxretry = 5
+EOF
+
+cat <<EOF > /etc/ssh/sshd_config.d/99-custom-hardening.conf
+PermitRootLogin no
+MaxAuthTries 3
+Protocol 2
+PermitEmptyPasswords no
+PasswordAuthentication no
+AuthenticationMethods publickey
+StrictModes yes
+EOF
+
+systemctl start fail2ban
+systemctl enable fail2ban
+systemctl restart sshd
+
+# Clean system
+apt autoremove -y
+
+
+# Show status of fail2ban service
+echo -e "\n\n\n\n\n\n\n\n\n\n"
+echo "=================================="
+echo "==== fail2ban service status ===="
+echo "=================================="
+echo
+systemctl status fail2ban --no-pager
+
+echo -e "\n\n\n"
+# Show information about the user stored in DOCKER_USER variable
+if [ -z "$DOCKER_USER" ]; then
+    echo "DOCKER_USER variable is not set."
+else
+    echo "=================================="
+    echo "==== Information for user: $DOCKER_USER ===="
+    echo "=================================="
+    echo
+    id "$DOCKER_USER" || echo "User $DOCKER_USER not found."
+    echo
+fi
+