# Security Checklist for Asteroids Website

## ✅ Implemented Security Features

### 1. **Authentication & Session Security**
- ✅ Password hashing using `password_hash()` with PASSWORD_DEFAULT
- ✅ Session regeneration on login to prevent session fixation
- ✅ Secure session cookie settings (httponly, samesite=strict)
- ✅ Proper logout with complete session destruction
- ✅ Authentication checks on protected pages

### 2. **SQL Injection Protection**
- ✅ All database queries use prepared statements with PDO
- ✅ No direct SQL concatenation with user input
- ✅ Input validation before database operations
- ✅ PDO error mode set to EXCEPTION for proper error handling

### 3. **Cross-Site Scripting (XSS) Protection**
- ✅ `htmlspecialchars()` used for all user-generated output
- ✅ Content Security Policy (CSP) headers configured
- ✅ X-XSS-Protection header enabled
- ✅ Input sanitization using `filter_input()` for emails

### 4. **Cross-Site Request Forgery (CSRF) Protection**
- ✅ CSRF tokens generated for all forms
- ✅ Token validation on form submission
- ✅ Secure random token generation using `random_bytes()`
- ✅ Token comparison using `hash_equals()` to prevent timing attacks

### 5. **Rate Limiting**
- ✅ Login attempt rate limiting (5 attempts per 15 minutes)
- ✅ Game action rate limiting to prevent abuse
- ✅ IP-based tracking with proxy detection
- ✅ Automatic cleanup of old rate limit records

### 6. **Security Headers**
- ✅ Content-Security-Policy (CSP)
- ✅ X-Content-Type-Options: nosniff
- ✅ X-Frame-Options: SAMEORIGIN
- ✅ X-XSS-Protection: 1; mode=block
- ✅ Referrer-Policy: strict-origin-when-cross-origin
- ✅ Permissions-Policy (restricts device access)

### 7. **Game Security & Anti-Cheat**
- ✅ Server-side score validation
- ✅ Game ownership verification
- ✅ Round progression validation
- ✅ Maximum score per round limits (50,000)
- ✅ Active game limits (5 per hour)
- ✅ Input range validation for all game data

### 8. **Input Validation**
- ✅ Username minimum length (3 characters)
- ✅ Password minimum length (6 characters)
- ✅ Email validation and sanitization
- ✅ Numeric input range validation
- ✅ JSON input validation for API endpoints

### 9. **Error Handling**
- ✅ Generic error messages in production mode
- ✅ Database errors don't expose sensitive information
- ✅ Proper HTTP status codes for different errors
- ✅ Logging without exposing details to users

### 10. **Configuration Security**
- ✅ Sensitive configuration in `.env` file (gitignored)
- ✅ Environment-based configuration (dev/production)
- ✅ Database credentials not hardcoded
- ✅ Fallback values for missing configuration

## ⚠️ Pre-Deployment Checklist

### Critical Tasks:
- [ ] **Delete test files:**
  - [ ] Remove `test_db_connection.php`
  - [ ] Remove `security_audit.php`
  - [ ] Remove any other test/debug files

- [ ] **Update configuration:**
  - [ ] Set `ENVIRONMENT=production` in `config.env`
  - [ ] Change database password from default
  - [ ] Remove hardcoded fallback password in `db.php`
  - [ ] Verify all sensitive files are in `.gitignore`

- [ ] **HTTPS Configuration:**
  - [ ] Enable SSL/TLS certificate
  - [ ] Force HTTPS redirect in `.htaccess`
  - [ ] Enable secure cookie flag for HTTPS

- [ ] **Database Security:**
  - [ ] Use a strong database password
  - [ ] Create dedicated database user (not root)
  - [ ] Grant minimum required permissions
  - [ ] Regular database backups

- [ ] **Server Configuration:**
  - [ ] Disable directory listing
  - [ ] Hide PHP version headers
  - [ ] Set proper file permissions (644 for files, 755 for directories)
  - [ ] Enable mod_security if available

## 🔒 Additional Recommendations

### High Priority:
1. **Implement 2FA** - Add two-factor authentication for user accounts
2. **Add CAPTCHA** - Implement CAPTCHA on registration/login forms
3. **Email Verification** - Require email verification for new accounts
4. **Password Recovery** - Implement secure password reset functionality
5. **Account Lockout** - Temporary account lockout after failed attempts

### Medium Priority:
1. **Audit Logging** - Log all security events (login, logout, failed attempts)
2. **Password Strength** - Implement password strength requirements
3. **Session Timeout** - Add automatic session timeout after inactivity
4. **IP Whitelisting** - Option to restrict admin access by IP
5. **Security Monitoring** - Implement intrusion detection

### Low Priority:
1. **Password History** - Prevent reuse of recent passwords
2. **Geographic Restrictions** - Block access from certain countries
3. **Device Fingerprinting** - Track and verify user devices
4. **API Rate Limiting** - Implement per-user API limits
5. **Security Badges** - Display security features to users

## 📊 Security Testing

Run these tests before deployment:

1. **SQL Injection Testing:**
   - Try injecting SQL in all input fields
   - Test with tools like SQLMap (ethically)

2. **XSS Testing:**
   - Try injecting JavaScript in all input fields
   - Test stored and reflected XSS

3. **CSRF Testing:**
   - Try submitting forms without tokens
   - Test token reuse

4. **Authentication Testing:**
   - Test session hijacking prevention
   - Verify logout completely clears session

5. **Rate Limiting Testing:**
   - Verify login attempts are limited
   - Test game action rate limits

## 🚨 Incident Response Plan

If a security breach occurs:

1. **Immediate Actions:**
   - Take site offline if necessary
   - Change all passwords
   - Review access logs
   - Identify breach vector

2. **Investigation:**
   - Check for unauthorized database changes
   - Review user accounts for suspicious activity
   - Analyze server logs

3. **Recovery:**
   - Patch vulnerability
   - Reset all user sessions
   - Notify affected users
   - Implement additional security measures

4. **Post-Incident:**
   - Document incident
   - Update security procedures
   - Consider security audit
   - Monitor for related attacks

## 📝 Security Maintenance

### Weekly:
- Review error logs
- Check for failed login attempts
- Monitor rate limit triggers

### Monthly:
- Update dependencies
- Review security headers
- Test backup restoration
- Check for new vulnerabilities

### Quarterly:
- Security audit
- Penetration testing
- Update security documentation
- Review user permissions

## 🔐 Contact Information

**Security Issues:** Report security vulnerabilities privately to admin
**Never expose security issues publicly before patching**

---

**Last Updated:** November 2024
**Version:** 1.0
**Status:** Ready for Production Review
