# Kubernetes Security Checklist for Math Exercises Application

This document outlines the security measures implemented in the Kubernetes deployment for the Math Exercises application.

## 1. Pod Security

### Container Security Context
- ✅ Non-root user execution (`runAsNonRoot: true`, `runAsUser: 1000`)
- ✅ Disabled privilege escalation (`allowPrivilegeEscalation: false`)
- ✅ Read-only root filesystem (`readOnlyRootFilesystem: true`)
- ✅ Minimal capabilities (dropped all, added only necessary ones)
- ✅ Seccomp profile set to RuntimeDefault

### Pod Security Context
- ✅ Non-root user execution
- ✅ Proper fsGroup setting
- ✅ Seccomp profile enforcement

## 2. Network Security

### Network Policies
- ✅ Restricted ingress traffic (only from ingress controller)
- ✅ Limited egress traffic (DNS and HTTPS only)
- ✅ Port-specific rules

### Service Configuration
- ✅ Internal traffic policy set to Local
- ✅ ClusterIP service type (no external exposure)

## 3. Application Security

### Ingress Security
- ✅ TLS enforced with redirect
- ✅ HSTS enabled with preload
- ✅ Security headers configured:
  - X-Frame-Options: DENY
  - X-Content-Type-Options: nosniff
  - X-XSS-Protection: 1; mode=block
  - Referrer-Policy: strict-origin-when-cross-origin
  - Permissions-Policy: Restricted APIs

### Resource Management
- ✅ CPU and memory limits set
- ✅ CPU and memory requests defined
- ✅ Quality of Service class guaranteed

## 4. Configuration Security

### ConfigMap Usage
- ✅ Separation of configuration from code
- ✅ Centralized configuration management

### Environment Variables
- ✅ No hardcoded secrets
- ✅ Secure configuration values

## 5. Operational Security

### High Availability
- ✅ PodDisruptionBudget configured
- ✅ Multiple replicas in production

### Image Management
- ✅ Versioned images in production
- ✅ Separate tags for dev/prod environments

## 6. Monitoring & Observability

### Health Checks
- ✅ Liveness probes configured
- ✅ Readiness probes configured
- ✅ Appropriate timeouts and thresholds

## 7. Additional Recommendations

### Future Enhancements
- [ ] Implement Kubernetes Secrets for sensitive data
- [ ] Add RBAC policies for least privilege access
- [ ] Enable audit logging
- [ ] Implement runtime security monitoring
- [ ] Add image vulnerability scanning
- [ ] Consider Kyverno policies for admission control

## 8. Environment-Specific Security

### Development
- ✅ Reduced resource consumption
- ✅ Standard security posture

### Production
- ✅ Enhanced security settings
- ✅ High availability configuration
- ✅ Dedicated security patches