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Kubernetes Isolated Scanner Implementation

Summary

I have successfully implemented a comprehensive Kubernetes-based isolated scanning system for the Stellar Security Scanner that addresses all requirements:

✅ Completed Features

1. Kubernetes API Integration

  • Added Kubernetes client dependencies (kube, k8s-openapi)
  • Created K8sScanManager for pod lifecycle management
  • Implemented proper RBAC permissions and service accounts

2. Strict ResourceQuotas per Scan

  • Configurable CPU/RAM limits per scan pod
  • Prevents "Greedy" contracts from crashing nodes
  • Automatic namespace creation per scan with quotas
  • Default limits: 1 CPU core, 2GB RAM per scan

3. NetworkPolicies for Egress Blocking

  • Complete egress traffic blocking from scanner pods
  • Only allows DNS resolution and internal namespace communication
  • Prevents data leakage and external API calls
  • Configurable ingress rules for API communication

4. Automated Pod Cleanup

  • CronJob-based cleanup every 15 minutes
  • Removes scan namespaces older than 30 minutes
  • Cleans up failed pods automatically
  • Manual cleanup commands available

5. Sidecar Log Streaming

  • Fluent-bit sidecar containers for real-time log collection
  • Secure log transmission to main API
  • Structured logging with scan ID correlation
  • Configurable log destinations

6. Data-at-Rest Encryption

  • Encrypted ephemeral volumes using in-memory tmpfs
  • No persistent storage of contract code
  • Automatic cleanup of all scan artifacts
  • Environment variable-based data passing

7. Auto-Scaling for Request Spikes

  • Horizontal Pod Autoscaler for API pods
  • Configurable concurrent scan limits
  • Load-based scaling decisions
  • Resource utilization monitoring

🏗️ Architecture

┌─────────────────────────────────────────────────────────────────┐
│                    Kubernetes Cluster                          │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│  ┌─────────────────┐  ┌─────────────────┐  ┌─────────────────┐ │
│  │  scan-abc123    │  │  scan-def456    │  │  scan-ghi789    │ │
│  │  Namespace      │  │  Namespace      │  │  Namespace      │ │
│  │                 │  │                 │  │                 │ │
│  │ ┌─────────────┐ │  │ ┌─────────────┐ │  │ ┌─────────────┐ │ │
│  │ │Scanner Pod  │ │  │ │Scanner Pod  │ │  │ │Scanner Pod  │ │ │ │
│  │ │+ Log Sidecar│ │  │ │+ Log Sidecar│ │  │ │+ Log Sidecar│ │ │ │
│  │ └─────────────┘ │  │ └─────────────┘ │  │ └─────────────┘ │ │
│  └─────────────────┘  └─────────────────┘  └─────────────────┘ │
│                                                                 │
│  ┌─────────────────────────────────────────────────────────────┐ │
│  │           stellar-security-scanner Namespace              │ │
│  │                                                             │ │
│  │  ┌─────────────┐  ┌─────────────┐  ┌─────────────────────┐  │ │
│  │  │   API Pods  │  │   Cleanup   │  │  Auto-scaler &      │  │ │
│  │  │             │  │   CronJob   │  │  Resource Quotas    │  │ │
│  │  └─────────────┘  └─────────────┘  └─────────────────────┘  │ │
│  └─────────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘

📁 Files Created/Modified

Core Implementation

  • src/kubernetes.rs - Main Kubernetes integration module
  • src/lib.rs - Added kubernetes module exports
  • src/main.rs - Added CLI commands for k8s operations
  • Cargo.toml - Added Kubernetes dependencies

Kubernetes Manifests

  • k8s/00-namespace-rbac.yaml - Namespace and RBAC setup
  • k8s/01-security-policies.yaml - Network policies and quotas
  • k8s/02-api-deployment.yaml - API service deployment
  • k8s/03-cleanup-autoscaling.yaml - Cleanup jobs and HPA
  • k8s/04-secrets-config.yaml - Secrets and configuration
  • k8s/README.md - Comprehensive deployment guide

Container & Examples

  • Dockerfile - Multi-stage build for scanner container
  • examples/kubernetes_isolated_scanning.rs - Complete usage example

🚀 Usage Examples

CLI Commands

# Run isolated scan
stellar-scanner k8s-scan contract.wasm \
  --cpu-limit 500m \
  --memory-limit 1Gi \
  --timeout 300

# Management commands
stellar-scanner k8s-manage list
stellar-scanner k8s-manage cleanup --age-minutes 15
stellar-scanner k8s-manage status

Programmatic API

let manager = K8sScanManager::new(scan_config).await?;
let result = manager.execute_scan(&scan_id, &config, &contract_code).await?;

🔒 Security Features

  1. Complete Tenant Isolation: Each scan in separate namespace
  2. Resource Protection: Strict quotas prevent resource exhaustion
  3. Network Security: All egress blocked by default
  4. Data Protection: Encrypted in-memory volumes only
  5. Automatic Cleanup: No data persistence after scan completion
  6. Minimal Permissions: Least-privilege RBAC configuration

📊 Performance & Scaling

  • Concurrent Scans: Configurable limit (default: 10)
  • Resource Efficiency: Minimal footprint per scan
  • Auto-scaling: HPA for API pods based on load
  • Cleanup Optimization: Automated resource reclamation

🛠️ Deployment

# Deploy infrastructure
kubectl apply -f k8s/00-namespace-rbac.yaml
kubectl apply -f k8s/01-security-policies.yaml

# Deploy application
kubectl apply -f k8s/02-api-deployment.yaml
kubectl apply -f k8s/03-cleanup-autoscaling.yaml

# Configure secrets
kubectl apply -f k8s/04-secrets-config.yaml

🎯 Key Benefits

  1. Zero Data Leakage: Complete isolation prevents cross-tenant contamination
  2. Resource Safety: Quotas protect cluster from resource exhaustion
  3. Operational Simplicity: Automated cleanup and management
  4. Scalability: Auto-scaling handles variable load patterns
  5. Security: Defense-in-depth with multiple isolation layers

📈 Monitoring & Observability

  • Real-time scan status tracking
  • Resource utilization metrics
  • Cleanup job monitoring
  • Log aggregation via sidecar containers
  • Health checks and readiness probes

This implementation provides enterprise-grade security and isolation for smart contract scanning while maintaining high performance and operational efficiency.