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Merge pull request #77 from buildplan/fail2ban_ignoreip
User-configurable ignoreip functionality for configure_fail2ban function. A few more key packages in package install.
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7506ce5d22
@ -7,9 +7,9 @@
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-----
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**Version:** v0.76
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**Version:** v0.77
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**Last Updated:** 2025-11-10
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**Last Updated:** 2025-11-17
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**Compatible With:**
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@ -87,12 +87,12 @@ sha256sum du_setup.sh
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Compare the output hash to the one below. They must match exactly.
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`09b6b710aa75119bf1205e7f2609c6ec43d695f589a1b66415baa464ca9e169b`
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`c0ba3b6fcb9022895c79f809b6e432fd4446f7464fc090d15d361508e234289e`
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Or echo the hash to check, it should output: `du_setup.sh: OK`
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```bash
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echo 09b6b710aa75119bf1205e7f2609c6ec43d695f589a1b66415baa464ca9e169b du_setup.sh | sha256sum --check
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echo c0ba3b6fcb9022895c79f809b6e432fd4446f7464fc090d15d361508e234289e du_setup.sh | sha256sum --check
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```
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### 3. Run the Script
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121
du_setup.sh
121
du_setup.sh
@ -1,8 +1,10 @@
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#!/bin/bash
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# Debian and Ubuntu Server Hardening Interactive Script
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# Version: 0.76 | 2025-11-10
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# Version: 0.77 | 2025-11-17
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# Changelog:
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# - v0.77: User-configurable ignoreip functionality for configure_fail2ban function.
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# Add a few more core packages in install_packages function.
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# - v0.76: Improve the flexibility of the built-in Docker daemon.json file to prevent any potential Docker issues.
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# - v0.75: Updated Docker daemon.json file to be more secure.
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# - v0.74: Add optional dtop (https://github.com/amir20/dtop) after docker installation.
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@ -81,7 +83,7 @@
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set -euo pipefail
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# --- Update Configuration ---
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CURRENT_VERSION="0.76"
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CURRENT_VERSION="0.77"
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SCRIPT_URL="https://raw.githubusercontent.com/buildplan/du_setup/refs/heads/main/du_setup.sh"
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CHECKSUM_URL="${SCRIPT_URL}.sha256"
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@ -232,7 +234,7 @@ print_header() {
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printf '%s\n' "${CYAN}╔═════════════════════════════════════════════════════════════════╗${NC}"
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printf '%s\n' "${CYAN}║ ║${NC}"
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printf '%s\n' "${CYAN}║ DEBIAN/UBUNTU SERVER SETUP AND HARDENING SCRIPT ║${NC}"
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printf '%s\n' "${CYAN}║ v0.76 | 2025-11-10 ║${NC}"
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printf '%s\n' "${CYAN}║ v0.77 | 2025-11-17 ║${NC}"
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printf '%s\n' "${CYAN}║ ║${NC}"
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printf '%s\n' "${CYAN}╚═════════════════════════════════════════════════════════════════╝${NC}"
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printf '\n'
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@ -2553,6 +2555,50 @@ validate_ufw_port() {
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[[ "$port" =~ ^[0-9]+(/tcp|/udp)?$ ]]
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}
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validate_ip_or_cidr() {
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local input="$1"
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# IPv4 address (simple check)
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if [[ "$input" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]]; then
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local -a octets
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IFS='.' read -ra octets <<< "$input"
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for octet in "${octets[@]}"; do
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if [[ "$octet" -gt 255 ]]; then
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return 1
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fi
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done
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return 0
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fi
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# IPv4 CIDR (e.g., 10.0.0.0/8)
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if [[ "$input" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]{1,2}$ ]]; then
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local ip="${input%/*}"
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local cidr="${input##*/}"
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local -a octets
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IFS='.' read -ra octets <<< "$ip"
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for octet in "${octets[@]}"; do
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if [[ "$octet" -gt 255 ]]; then
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return 1
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fi
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done
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if [[ "$cidr" -ge 0 && "$cidr" -le 32 ]]; then
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return 0
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fi
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return 1
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fi
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# IPv6 address (basic check)
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if [[ "$input" =~ ^[0-9a-fA-F:]+$ && "$input" == *":"* && "$input" != *"/"* ]]; then
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return 0
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fi
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# IPv6 CIDR (permissive check, allows compressed ::)
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if [[ "$input" =~ ^[0-9a-fA-F:]+/[0-9]{1,3}$ && "$input" == *":"* ]]; then
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local cidr="${input##*/}"
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if [[ "$cidr" -ge 0 && "$cidr" -le 128 ]]; then
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return 0
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fi
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return 1
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fi
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return 1
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}
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convert_to_bytes() {
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local size_upper="${1^^}" # Convert to uppercase for case-insensitivity
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local unit="${size_upper: -1}"
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@ -2811,6 +2857,7 @@ install_packages() {
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ufw fail2ban unattended-upgrades chrony \
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rsync wget vim htop iotop nethogs netcat-traditional ncdu \
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tree rsyslog cron jq gawk coreutils perl skopeo git \
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apt-listchanges ca-certificates gnupg logrotate \
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ssh openssh-client openssh-server; then
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print_error "Failed to install one or more essential packages."
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exit 1
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@ -3603,8 +3650,51 @@ configure_firewall() {
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configure_fail2ban() {
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print_section "Fail2Ban Configuration"
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# --- Collect User IPs to Ignore ---
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local IGNORE_IPS="127.0.0.1/8 ::1"
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local INVALID_IPS=""
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if confirm "Add custom IP addresses or ranges to Fail2Ban ignore list (e.g., your IP, Tailscale)?"; then
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print_info "Enter IP addresses or CIDR ranges to whitelist (space-separated)."
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print_info "Examples: 192.168.1.100 10.0.0.0/8 100.64.0.0/10"
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print_info "Tailscale range: 100.64.0.0/10"
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read -rp "$(printf '%s' "${CYAN}IPs to ignore: ${NC}")" CUSTOM_IPS
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if [[ -n "$CUSTOM_IPS" ]]; then
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# Validate each IP/CIDR in the input
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local VALID_IPS=""
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local INVALID_COUNT=0
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for ip in $CUSTOM_IPS; do
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if validate_ip_or_cidr "$ip"; then
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VALID_IPS="$VALID_IPS $ip"
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else
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print_error "Invalid format, skipping: $ip"
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INVALID_IPS="$INVALID_IPS $ip"
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((INVALID_COUNT++))
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fi
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done
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if [[ -n "$VALID_IPS" ]]; then
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IGNORE_IPS="$IGNORE_IPS $VALID_IPS"
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print_success "Added ${VALID_IPS// /, } to ignore list."
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log "Added custom Fail2Ban ignore IPs:$VALID_IPS"
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fi
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if [[ $INVALID_COUNT -gt 0 ]]; then
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print_warning "$INVALID_COUNT invalid IP(s) were skipped:$INVALID_IPS"
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print_info "Continuing with valid IPs only. You can add more IPs later."
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log "Skipped invalid IPs:$INVALID_IPS"
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fi
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else
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print_info "No custom IPs provided. Using defaults only."
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fi
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else
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print_info "Using default ignore IPs only (localhost)."
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fi
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# --- Define Desired Configurations ---
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# Define content of config file.
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local UFW_PROBES_CONFIG
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UFW_PROBES_CONFIG=$(cat <<'EOF'
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[Definition]
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@ -3617,7 +3707,7 @@ EOF
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local JAIL_LOCAL_CONFIG
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JAIL_LOCAL_CONFIG=$(cat <<EOF
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[DEFAULT]
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ignoreip = 127.0.0.1/8 ::1
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ignoreip = $IGNORE_IPS
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bantime = 1d
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findtime = 10m
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maxretry = 5
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@ -3641,7 +3731,6 @@ EOF
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local JAIL_LOCAL_PATH="/etc/fail2ban/jail.local"
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# --- Idempotency Check ---
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# This checks if the on-disk files are already identical to our desired configuration.
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if [[ -f "$UFW_FILTER_PATH" && -f "$JAIL_LOCAL_PATH" ]] && \
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cmp -s "$UFW_FILTER_PATH" <<<"$UFW_PROBES_CONFIG" && \
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cmp -s "$JAIL_LOCAL_PATH" <<<"$JAIL_LOCAL_CONFIG"; then
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@ -3651,7 +3740,6 @@ EOF
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fi
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# --- Apply Configuration ---
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# If the check above fails, we write the correct configuration files.
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print_info "Applying new Fail2Ban configuration..."
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mkdir -p /etc/fail2ban/filter.d
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echo "$UFW_PROBES_CONFIG" > "$UFW_FILTER_PATH"
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@ -3667,12 +3755,27 @@ EOF
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print_info "Enabling and restarting Fail2Ban to apply new rules..."
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systemctl enable fail2ban
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systemctl restart fail2ban
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sleep 2 # Give the service a moment to initialize.
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sleep 2
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if systemctl is-active --quiet fail2ban; then
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print_success "Fail2Ban is active with the new configuration."
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# Show the status of the enabled jails for confirmation.
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fail2ban-client status | tee -a "$LOG_FILE"
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# Show how to add IPs later
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if [[ $INVALID_COUNT -gt 0 ]] || confirm "Show instructions for adding IPs later?" "n"; then
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printf "\n"
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print_info "To add more IP addresses to Fail2Ban ignore list later:"
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printf "%s1. Edit the configuration file:%s\n" "$CYAN" "$NC"
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printf " %ssudo nano /etc/fail2ban/jail.local%s\n" "$BOLD" "$NC"
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printf "%s2. Update the 'ignoreip' line under [DEFAULT]:%s\n" "$CYAN" "$NC"
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printf " %signoreip = 127.0.0.1/8 ::1 YOUR_IP_HERE%s\n" "$BOLD" "$NC"
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printf "%s3. Restart Fail2Ban:%s\n" "$CYAN" "$NC"
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printf " %ssudo systemctl restart fail2ban%s\n" "$BOLD" "$NC"
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printf "%s4. Verify the configuration:%s\n" "$CYAN" "$NC"
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printf " %ssudo fail2ban-client status%s\n" "$BOLD" "$NC"
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printf "\n"
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log "Displayed post-installation Fail2Ban instructions."
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fi
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else
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print_error "Fail2Ban service failed to start. Check 'journalctl -u fail2ban' for errors."
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FAILED_SERVICES+=("fail2ban")
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@ -1 +1 @@
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09b6b710aa75119bf1205e7f2609c6ec43d695f589a1b66415baa464ca9e169b du_setup.sh
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c0ba3b6fcb9022895c79f809b6e432fd4446f7464fc090d15d361508e234289e du_setup.sh
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