hykocx
8383612fe8
- drop DO_SSH flag, --no-ssh option, and setup_ssh() function entirely - replace inline sshd_config port read with sshd_effective_port() that also scans sshd_config.d drop-ins - replace raw DEBIAN_FRONTEND export with apt_noninteractive helper and add wait_for_apt guard - replace hardcoded separator strings with show_separator calls
166 lines
7.2 KiB
Bash
Executable File
166 lines
7.2 KiB
Bash
Executable File
#!/bin/bash
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# LXS - Server Hardening
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# Description: Apply baseline security hardening (UFW + fail2ban + unattended-upgrades)
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# Author: LXS
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# Date: 2025
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# Load LXS common library (colors, separator, run_spinner, loggers, helpers)
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LXS_RAW_BASE="${LXS_RAW_BASE:-https://git.hyko.cx/hykocx/lxs/raw/branch/main}"
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_lib=$(curl -fsSL "${LXS_RAW_BASE}/lib/common.sh") || { echo "Failed to fetch lib/common.sh" >&2; exit 1; }
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eval "$_lib"
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unset _lib
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export LXS_LOG_FILE="/tmp/lxs_harden.log"
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require_root "$0" "$@"
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set -u
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# ═══════════════════════════════════════════════════════════════════════════
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# Configuration
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# ═══════════════════════════════════════════════════════════════════════════
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DO_UFW=1
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DO_FAIL2BAN=1
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DO_UNATTENDED=1
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ASSUME_YES=0
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for arg in "$@"; do
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case "$arg" in
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--no-ufw) DO_UFW=0 ;;
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--no-fail2ban) DO_FAIL2BAN=0 ;;
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--no-unattended) DO_UNATTENDED=0 ;;
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-y|--yes) ASSUME_YES=1 ;;
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-h|--help)
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cat <<EOF
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Usage: harden.sh [options]
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Options:
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--no-ufw Skip UFW firewall setup
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--no-fail2ban Skip fail2ban setup
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--no-unattended Skip unattended-upgrades setup
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-y, --yes Skip confirmation prompt
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-h, --help Show this help
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EOF
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exit 0
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;;
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*)
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echo -e "${RED}Unknown option: $arg${NC}" >&2
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exit 1
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;;
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esac
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done
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# ═══════════════════════════════════════════════════════════════════════════
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# Pre-checks
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# ═══════════════════════════════════════════════════════════════════════════
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require_debian_ubuntu || exit 1
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# Read the effective Port from sshd_config + any drop-in under sshd_config.d/
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sshd_effective_port() {
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local files=(/etc/ssh/sshd_config)
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if compgen -G "/etc/ssh/sshd_config.d/*.conf" >/dev/null; then
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files+=(/etc/ssh/sshd_config.d/*.conf)
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fi
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awk '/^[[:space:]]*Port[[:space:]]+/ {print $2}' "${files[@]}" 2>/dev/null | tail -1
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}
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SSH_PORT=$(sshd_effective_port)
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SSH_PORT=${SSH_PORT:-22}
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echo -e "${WHITE}${BOLD}LXS Server Hardening${NC}"
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show_separator
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echo "The following actions will be applied to this server:"
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[ $DO_UFW -eq 1 ] && echo " • UFW firewall: default deny incoming, allow SSH on port ${SSH_PORT}"
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[ $DO_FAIL2BAN -eq 1 ] && echo " • fail2ban: enable sshd jail (bantime 1h, maxretry 5)"
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[ $DO_UNATTENDED -eq 1 ] && echo " • unattended-upgrades: enable automatic security updates"
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show_separator
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if [ $ASSUME_YES -ne 1 ]; then
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read -r -p "Proceed? [y/N] " reply
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case "$reply" in
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[yY]|[yY][eE][sS]) ;;
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*) info "Aborted."; exit 0 ;;
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esac
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fi
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apt_noninteractive
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wait_for_apt || exit 1
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# ═══════════════════════════════════════════════════════════════════════════
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# UFW
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# ═══════════════════════════════════════════════════════════════════════════
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setup_ufw() {
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info "Installing and configuring UFW..."
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apt-get update -qq
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apt-get install -y -qq ufw
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ufw --force reset >/dev/null
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ufw default deny incoming
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ufw default allow outgoing
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ufw allow "${SSH_PORT}/tcp" comment 'SSH'
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ufw --force enable
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ok "UFW enabled (SSH on ${SSH_PORT}/tcp allowed)"
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}
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# ═══════════════════════════════════════════════════════════════════════════
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# fail2ban
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# ═══════════════════════════════════════════════════════════════════════════
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setup_fail2ban() {
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info "Installing and configuring fail2ban..."
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apt-get install -y -qq fail2ban
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cat > /etc/fail2ban/jail.local <<EOF
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[DEFAULT]
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bantime = 1h
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findtime = 10m
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maxretry = 5
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backend = systemd
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[sshd]
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enabled = true
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port = ${SSH_PORT}
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EOF
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systemctl enable --now fail2ban
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systemctl restart fail2ban
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ok "fail2ban enabled (sshd jail active)"
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}
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# ═══════════════════════════════════════════════════════════════════════════
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# unattended-upgrades
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# ═══════════════════════════════════════════════════════════════════════════
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setup_unattended() {
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info "Installing and enabling unattended-upgrades..."
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apt-get install -y -qq unattended-upgrades apt-listchanges
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cat > /etc/apt/apt.conf.d/20auto-upgrades <<'EOF'
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APT::Periodic::Update-Package-Lists "1";
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APT::Periodic::Unattended-Upgrade "1";
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APT::Periodic::AutocleanInterval "7";
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EOF
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systemctl enable --now unattended-upgrades
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ok "unattended-upgrades enabled (security updates only by default)"
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}
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# ═══════════════════════════════════════════════════════════════════════════
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# Run
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# ═══════════════════════════════════════════════════════════════════════════
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[ $DO_UFW -eq 1 ] && setup_ufw
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[ $DO_FAIL2BAN -eq 1 ] && setup_fail2ban
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[ $DO_UNATTENDED -eq 1 ] && setup_unattended
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# ═══════════════════════════════════════════════════════════════════════════
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# Summary
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# ═══════════════════════════════════════════════════════════════════════════
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echo ""
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echo -e "${WHITE}${BOLD}Summary${NC}"
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show_separator
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command -v ufw >/dev/null && echo "UFW: $(ufw status | head -1)"
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systemctl is-active fail2ban >/dev/null 2>&1 && echo "fail2ban: active" || echo "fail2ban: inactive"
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systemctl is-active unattended-upgrades >/dev/null 2>&1 && echo "unattended-upgrades: active" || echo "unattended-upgrades: inactive"
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echo ""
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ok "Hardening complete."
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