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Linux-Server-Management-Too…/modules/security/bot-blocker.sh
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cschantz 8a4d70c37c Standardize bot-blocker.sh menu validation, colors, and yes/no prompts 
IMPROVEMENTS:
- Added input validation for menu choice (0-5) with retry loop
- Added color codes to menu options (${CYAN}1)${NC} and ${RED}0)${NC})
- Removed wildcard case that accepted invalid input silently
- Standardized yes/no prompts to use confirm() library function
- Improved user prompt to show valid range (0-5)

VALIDATION DETAILS:
- Menu choice: Only accepts 0-5, rejects invalid with clear error message
- Retry loop: User stays in menu until valid choice is entered
- Yes/no prompts: Now use confirm() function for consistency
  - Line 45: "Create directory?"
  - Line 146: "Re-apply configuration?"

MENU STANDARDS COMPLIANCE:
✓ Input validation (CRITICAL)
✓ Color codes (IMPORTANT - standardized to CYAN/RED)
✓ Error messages on invalid input (IMPORTANT)
✓ Retry logic for failed validation (IMPORTANT)
✓ Standardized yes/no prompts (IMPORTANT)

Lines modified: ~30 (validation, colors, confirm() function)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
2026-02-17 18:42:04 -05:00

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#!/bin/bash
################################################################################
# Bot Blocker - Apache User-Agent Blocking Manager
################################################################################
# Blocks malicious bots, scrapers, and AI crawlers at Apache level
# Safe implementation with backup, validation, and rollback
################################################################################
# Source common functions
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../../lib/common-functions.sh" 2>/dev/null || {
echo "[ERROR] Cannot load common-functions.sh"
exit 1
}
# Detect control panel and system (optional)
if type -t detect_system &>/dev/null; then
detect_system
fi
# Configuration
APACHE_CONF="/etc/apache2/conf.d/includes/pre_main_global.conf"
BACKUP_DIR="/root/.bot-blocker-backups"
MARKER_START="# BEGIN Bot Blocker - Managed by Server Toolkit"
MARKER_END="# END Bot Blocker"
# Default bot list (security scanners, aggressive SEO bots, AI crawlers)
DEFAULT_BOT_LIST="nikto|nmap|masscan|sqlmap|havij|acunetix|nessus|burp|metasploit|AhrefsBot|SemrushBot|MJ12bot|DotBot|Meta-ExternalAgent|Go-http-client|ChatGPT-User|GPTBot|Google-Extended|anthropic-ai|Claude-Web|CCBot|Omgilibot|FacebookBot|Bytespider|PerplexityBot"
################################################################################
# Helper Functions
################################################################################
check_apache_installed() {
if ! command -v httpd &>/dev/null; then
print_error "Apache is not installed"
return 1
fi
return 0
}
check_apache_config_exists() {
local conf_dir=$(dirname "$APACHE_CONF")
if [ ! -d "$conf_dir" ]; then
print_warning "Apache config directory doesn't exist: $conf_dir"
echo ""
if ! confirm "Create directory?"; then
return 1
fi
mkdir -p "$conf_dir"
print_success "Created directory: $conf_dir"
fi
if [ ! -f "$APACHE_CONF" ]; then
print_info "Config file doesn't exist, will be created: $APACHE_CONF"
touch "$APACHE_CONF"
fi
return 0
}
is_bot_blocking_enabled() {
if [ ! -f "$APACHE_CONF" ]; then
return 1
fi
grep -q "$MARKER_START" "$APACHE_CONF" 2>/dev/null
}
create_backup() {
mkdir -p "$BACKUP_DIR"
local backup_file="$BACKUP_DIR/pre_main_global.conf.$(date +%Y%m%d_%H%M%S)"
if [ -f "$APACHE_CONF" ]; then
cp "$APACHE_CONF" "$backup_file"
print_success "Backup created: $backup_file"
echo "$backup_file"
else
# No existing file to backup
echo ""
fi
}
validate_apache_syntax() {
print_info "Validating Apache configuration..."
if httpd -t 2>&1 | grep -q "Syntax OK"; then
print_success "Apache configuration syntax is valid"
return 0
else
print_error "Apache configuration has syntax errors:"
echo ""
httpd -t 2>&1 | grep -v "Syntax OK"
return 1
fi
}
restart_apache() {
print_info "Restarting Apache..."
if systemctl restart httpd; then
print_success "Apache restarted successfully"
return 0
else
print_error "Failed to restart Apache"
return 1
fi
}
restore_backup() {
local backup_file="$1"
if [ -f "$backup_file" ]; then
cp "$backup_file" "$APACHE_CONF"
print_success "Configuration restored from backup"
restart_apache
else
print_error "Backup file not found: $backup_file"
fi
}
################################################################################
# Core Functions
################################################################################
enable_bot_blocking() {
print_banner "Enable Bot Blocking"
# Check prerequisites
if ! check_apache_installed; then
press_enter
return 1
fi
if ! check_apache_config_exists; then
press_enter
return 1
fi
# Check if already enabled
if is_bot_blocking_enabled; then
print_warning "Bot blocking is already enabled"
echo ""
if ! confirm "Re-apply configuration?"; then
return 0
fi
disable_bot_blocking_silent
fi
echo ""
echo "Bot Blocking Configuration:"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""
echo "This will block the following types of bots:"
echo ""
echo " 🔴 Security Scanners:"
echo " nikto, nmap, masscan, sqlmap, havij, acunetix, nessus, burp, metasploit"
echo ""
echo " 🟡 Aggressive SEO Bots:"
echo " AhrefsBot, SemrushBot, MJ12bot, DotBot"
echo ""
echo " 🟣 AI Crawlers:"
echo " ChatGPT-User, GPTBot, Google-Extended, Claude-Web, anthropic-ai"
echo ""
echo " 🔵 Generic Scrapers:"
echo " Go-http-client, Meta-ExternalAgent, CCBot, Omgilibot, FacebookBot,"
echo " Bytespider, PerplexityBot"
echo ""
echo "Configuration file: $APACHE_CONF"
echo ""
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""
read -p "Proceed with enabling bot blocking? (yes/no): " confirm
if [ "$confirm" != "yes" ]; then
echo "Cancelled."
press_enter
return 0
fi
# Create backup
echo ""
local backup_file=$(create_backup)
# Add bot blocking rules
echo ""
print_info "Adding bot blocking rules..."
# Build the configuration with variables expanded
local timestamp=$(date '+%Y-%m-%d %H:%M:%S')
cat >> "$APACHE_CONF" <<EOF
# BEGIN Bot Blocker - Managed by Server Toolkit
# Blocks malicious bots, scrapers, and AI crawlers
# Last updated: ${timestamp}
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} "(${DEFAULT_BOT_LIST})" [NC]
RewriteRule ^ - [F,L]
</IfModule>
# END Bot Blocker
EOF
print_success "Bot blocking rules added"
# Validate syntax
echo ""
if ! validate_apache_syntax; then
print_error "Configuration validation failed!"
echo ""
read -p "Rollback to previous configuration? (yes/no): " rollback
if [ "$rollback" = "yes" ] && [ -n "$backup_file" ]; then
restore_backup "$backup_file"
fi
press_enter
return 1
fi
# Restart Apache
echo ""
if restart_apache; then
echo ""
print_success "═══════════════════════════════════════════════════════"
print_success "Bot blocking enabled successfully!"
print_success "═══════════════════════════════════════════════════════"
echo ""
echo "What happens now:"
echo " ✓ Blocked bots receive HTTP 403 Forbidden"
echo " ✓ Legitimate traffic is unaffected"
echo " ✓ Configuration survives Apache restarts"
echo ""
echo "To disable: Use option 2 from the menu"
echo ""
else
print_error "Failed to restart Apache"
if [ -n "$backup_file" ]; then
echo ""
read -p "Rollback to previous configuration? (yes/no): " rollback
if [ "$rollback" = "yes" ]; then
restore_backup "$backup_file"
fi
fi
fi
press_enter
}
disable_bot_blocking_silent() {
# Silent version for internal use (re-apply scenario)
if [ -f "$APACHE_CONF" ]; then
sed -i "/$MARKER_START/,/$MARKER_END/d" "$APACHE_CONF"
fi
}
disable_bot_blocking() {
print_banner "Disable Bot Blocking"
# Check if enabled
if ! is_bot_blocking_enabled; then
print_warning "Bot blocking is not currently enabled"
press_enter
return 0
fi
echo ""
echo "This will remove bot blocking rules from:"
echo " $APACHE_CONF"
echo ""
read -p "Proceed with disabling bot blocking? (yes/no): " confirm
if [ "$confirm" != "yes" ]; then
echo "Cancelled."
press_enter
return 0
fi
# Create backup
echo ""
local backup_file=$(create_backup)
# Remove bot blocking rules
echo ""
print_info "Removing bot blocking rules..."
sed -i "/$MARKER_START/,/$MARKER_END/d" "$APACHE_CONF"
print_success "Bot blocking rules removed"
# Validate syntax
echo ""
if ! validate_apache_syntax; then
print_error "Configuration validation failed!"
echo ""
read -p "Rollback to previous configuration? (yes/no): " rollback
if [ "$rollback" = "yes" ] && [ -n "$backup_file" ]; then
restore_backup "$backup_file"
fi
press_enter
return 1
fi
# Restart Apache
echo ""
if restart_apache; then
echo ""
print_success "Bot blocking disabled successfully"
echo ""
else
print_error "Failed to restart Apache"
if [ -n "$backup_file" ]; then
echo ""
read -p "Rollback to previous configuration? (yes/no): " rollback
if [ "$rollback" = "yes" ]; then
restore_backup "$backup_file"
fi
fi
fi
press_enter
}
view_configuration() {
print_banner "Current Bot Blocking Configuration"
if ! is_bot_blocking_enabled; then
print_warning "Bot blocking is not currently enabled"
echo ""
echo "Use option 1 to enable bot blocking"
press_enter
return 0
fi
echo ""
echo "Status: ${GREEN}Enabled${NC}"
echo "Config file: $APACHE_CONF"
echo ""
echo "Current rules:"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
# Extract and display bot blocking section
sed -n "/$MARKER_START/,/$MARKER_END/p" "$APACHE_CONF"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""
# Parse and display bot list
local bot_list=$(sed -n "/$MARKER_START/,/$MARKER_END/p" "$APACHE_CONF" | grep "RewriteCond.*HTTP_USER_AGENT" | sed 's/.*"(\(.*\))".*/\1/')
if [ -n "$bot_list" ]; then
echo "Blocked User-Agents:"
echo ""
echo "$bot_list" | tr '|' '\n' | nl | column -t
echo ""
fi
press_enter
}
test_configuration() {
print_banner "Test Apache Configuration"
echo ""
print_info "Running Apache syntax check..."
echo ""
if validate_apache_syntax; then
echo ""
print_success "Configuration is valid and ready to apply"
else
echo ""
print_error "Configuration has errors - fix before applying"
fi
echo ""
press_enter
}
manage_backups() {
print_banner "Backup Management"
if [ ! -d "$BACKUP_DIR" ] || [ -z "$(ls -A "$BACKUP_DIR" 2>/dev/null)" ]; then
print_warning "No backups found"
echo ""
echo "Backups are created automatically when you enable/disable bot blocking"
press_enter
return 0
fi
echo ""
echo "Available backups:"
echo ""
local count=1
while IFS= read -r backup; do
local size=$(du -h "$backup" | cut -f1)
local date=$(basename "$backup" | sed 's/pre_main_global.conf.//')
echo " $count) $date ($size)"
count=$((count + 1))
done < <(ls -t "$BACKUP_DIR"/*.conf.* 2>/dev/null)
echo ""
echo " 0) Back to menu"
echo ""
read -p "Select backup to restore (or 0 to cancel): " selection
if [ "$selection" = "0" ]; then
return 0
fi
local backup_file=$(ls -t "$BACKUP_DIR"/*.conf.* 2>/dev/null | sed -n "${selection}p")
if [ -z "$backup_file" ]; then
print_error "Invalid selection"
press_enter
return 1
fi
echo ""
echo "Selected backup: $(basename "$backup_file")"
echo ""
read -p "Restore this backup? (yes/no): " confirm
if [ "$confirm" = "yes" ]; then
restore_backup "$backup_file"
echo ""
print_success "Backup restored successfully"
fi
press_enter
}
################################################################################
# Main Menu
################################################################################
show_menu() {
clear
print_banner "Bot Blocker - Apache User-Agent Management"
# Show status
if is_bot_blocking_enabled; then
echo -e "Status: ${GREEN}●${NC} Enabled"
else
echo -e "Status: ${RED}○${NC} Disabled"
fi
echo ""
echo -e "${BOLD}Configuration:${NC}"
echo ""
echo -e " ${CYAN}1)${NC} Enable Bot Blocking - Block malicious bots and scrapers"
echo -e " ${CYAN}2)${NC} Disable Bot Blocking - Remove blocking rules"
echo -e " ${CYAN}3)${NC} View Configuration - Show current rules"
echo ""
echo -e "${BOLD}Maintenance:${NC}"
echo ""
echo -e " ${CYAN}4)${NC} Test Configuration - Validate Apache syntax"
echo -e " ${CYAN}5)${NC} Manage Backups - View and restore backups"
echo ""
echo -e " ${RED}0)${NC} Back to Security Menu"
echo ""
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo -n "Select option (0-5): "
}
main() {
while true; do
show_menu
# Validate choice input
while true; do
read -r choice
if ! [[ "$choice" =~ ^[0-5]$ ]]; then
echo ""
print_error "Invalid choice. Please enter 0-5"
echo ""
continue
fi
break
done
case $choice in
1) enable_bot_blocking ;;
2) disable_bot_blocking ;;
3) view_configuration ;;
4) test_configuration ;;
5) manage_backups ;;
0)
clear
exit 0
;;
esac
done
}
# Run main menu
main
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