Patch Notes v2.1.6 - Maximum Bot Protection Update

️ Major Features
Multi-Tier Ban System

• NEW: Temporary ban system (10 minutes) for excessive failed attempts
• NEW: Permanent ban system for highly suspicious IPs (score ≥300)
• NEW: Automatic temporary ban removal after expiration
• IMPROVED: Ban tracking with concurrent data structures

Advanced Behavioral Analysis

• NEW: Pattern detection for bot-like uniform timing
• NEW: Action sequence tracking (last 50 actions)
• NEW: Repetitive behavior detection (80% threshold)
• NEW: Behavior diversity scoring system
• NEW: Automated analysis every 30 seconds

Enhanced DDoS Protection

• NEW: Three-tier rate limiting: per-second, per-minute, per-hour
• NEW: Hourly connection limit (300 connections/hour)
• NEW: Connection history tracking (last 100 connections)
• NEW: Suspicious connection pattern detection
• IMPROVED: Minimum connection interval enforcement (100ms)

Device Fingerprinting System

• NEW: SHA-256 based device fingerprinting
• NEW: Multi-account detection (max 3 accounts per device)
• NEW: IP association tracking per fingerprint
• NEW: Fingerprint abuse detection and penalties
• NEW: First-seen and last-seen timestamp tracking

Username Validation

• NEW: Bot pattern detection in usernames
• NEW: Suspicious keyword filtering (bot, test, hack, spam, flood)
• NEW: Numeric pattern analysis (4+ consecutive digits)
• NEW: Vowel ratio analysis (detects random character strings)
• NEW: Length validation (3-16 characters)

Token Bucket Rate Limiter

• NEW: Per-IP rate limiting with token bucket algorithm
• NEW: 10 tokens per IP with automatic refill every minute
• NEW: Prevents request flooding and spam attacks

Enhanced Scoring System
Penalty Values (Updated)

• INCREASED: Rapid login penalty: 40 → 50 points
• INCREASED: Limit exceeded penalty: 60 → 80 points
• NEW: Suspicious username penalty: 40 points
• NEW: Identical behavior penalty: 70 points
• NEW: Fingerprint abuse penalty: 60 points
• NEW: Pattern detection penalty: 70 points

Score Benefits

• NEW: Successful login reduces score by 10 points
• IMPROVED: Time decay bonus: 30 → 20 points (more gradual)
• NEW: Automatic score reset after reset interval

Technical Improvements
Thread Safety

• IMPROVED: All counters use atomic operations (AtomicInteger, AtomicLong)
• IMPROVED: ConcurrentHashMap for all data structures
• IMPROVED: Thread-safe cleanup operations
• NEW: Separate executor service for behavior analysis

Performance Optimizations

• NEW: Efficient pattern analysis using standard deviation
• NEW: Limited queue sizes to prevent memory issues
• NEW: Automatic cleanup of expired entries every 5 minutes
• IMPROVED: Reduced memory footprint with bounded collections

Monitoring & Statistics

• NEW: getProtectionStats(ip) - Detailed per-IP statistics
• NEW: getTopSuspiciousIPs(limit) - Find most dangerous IPs
• NEW: getGlobalStats() - Server-wide protection statistics
• NEW: Penalty reason tracking for debugging
• NEW: Bot flagging system with persistent markers

Statistics Tracked
Per-IP Statistics

• Total login attempts
• Failed login attempts
• Current suspicion score
• Bot flag status
• Active connections
• Ban status (temporary/permanent)
• Penalty reasons breakdown

Global Statistics

• Total tracked IPs
• Active temporary bans
• Active permanent bans
• Tracked device fingerprints
• Active behavior profiles
• IPs flagged as bots
• High-risk IPs (score ≥100)

Configuration Changes
New Configuration Options
yaml
enable-advanced-protection: true # Master switch for advanced features
enable-behavior-analysis: true # Real-time behavior pattern detection
enable-fingerprint-tracking: true # Device fingerprinting system
Updated Default Values

• max-attempts-per-ip: 5 → 3 (stricter)
• max-connections-per-second: 10 → 5 (stricter)
• max-connections-per-minute: 100 → 50 (stricter)
• min-connection-interval-ms: 50 → 100 (stricter)

Bug Fixes

• FIXED: Race conditions in attempt counting
• FIXED: Memory leaks in long-running servers
• FIXED: Improper cleanup of expired entries
• FIXED: Thread safety issues in score calculation
• FIXED: Window reset timing in connection tracking

⚠️ Breaking Changes
None. This update is fully backward compatible with existing configurations.

Migration Notes

1. Update your config.yml with new configuration options
2. Existing ban data will be preserved
3. New protection features activate automatically
4. Monitor logs for [AntiBotProtection] messages
5. Use /authpro stats to view protection statistics

Future Improvements

• Machine learning-based bot detection
• GeoIP-based risk assessment
• Proxy/VPN detection integration
• Captcha difficulty scaling
• Whitelist/blacklist management commands
• Real-time threat intelligence feeds

System Requirements

• Java Version: 17+
• Minecraft Server: Spigot/Paper 1.18+
• Recommended RAM: +256MB for protection system
• Recommended CPU: 2+ cores for behavior analysis

Performance Impact

• CPU Usage: +2-5% (with all features enabled)
• Memory Usage: ~50-100MB (depends on player count)
• Network Overhead: Minimal (<1%)