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Network Security

Network Architecture​

Security Zones​

Firewall Configuration​

Network Security Groups​

security_groups:
  public_lb:
    name: public-lb-sg
    description: Public Load Balancer Security Group
    rules:
      ingress:
        - protocol: tcp
          ports: [80, 443]
          source: 0.0.0.0/0
          description: HTTP/HTTPS access
      egress:
        - protocol: tcp
          ports: [3000]
          destination: app-tier-sg
          description: Application access

  app_tier:
    name: app-tier-sg
    description: Application Tier Security Group
    rules:
      ingress:
        - protocol: tcp
          ports: [3000]
          source: public-lb-sg
          description: Load balancer access
      egress:
        - protocol: tcp
          ports: [5432, 6379]
          destination: data-tier-sg
          description: Database access

  data_tier:
    name: data-tier-sg
    description: Data Tier Security Group
    rules:
      ingress:
        - protocol: tcp
          ports: [5432, 6379]
          source: app-tier-sg
          description: Application access
      egress:
        - protocol: -1
          ports: []
          destination: 0.0.0.0/0
          description: Internet access for updates

Network Access Control​

Access Policies​

network_access:
  vpn_access:
    protocol: OpenVPN
    authentication:
      - certificate
      - mfa_token
    allowed_networks:
      - management_network
      - monitoring_network

  bastion_access:
    protocol: SSH
    authentication:
      - ssh_key
      - mfa_token
    allowed_users:
      - system_administrators
      - devops_engineers

  api_access:
    protocol: HTTPS
    authentication:
      - jwt_token
      - api_key
    rate_limiting:
      rate: 1000
      period: minute

DDoS Protection​

DDoS Configuration​

ddos_protection:
  rate_limiting:
    http:
      rate: 10000
      burst: 1000
      period: minute
    
    api:
      rate: 5000
      burst: 500
      period: minute

  blacklisting:
    threshold:
      requests: 1000
      period: minute
      status_codes: [400, 401, 403, 404]
    
    duration: 24h

  whitelisting:
    - trusted_partners
    - monitoring_services
    - internal_networks

SSL/TLS Configuration​

SSL Configuration​

ssl_configuration:
  certificates:
    provider: Let's Encrypt
    auto_renewal: true
    renewal_threshold: 30d
    
  protocols:
    minimum: TLS 1.2
    preferred: TLS 1.3
    
  ciphers:
    - TLS_AES_128_GCM_SHA256
    - TLS_AES_256_GCM_SHA384
    - TLS_CHACHA20_POLY1305_SHA256

  options:
    hsts: true
    ocsp_stapling: true
    session_tickets: false

Network Monitoring​

Monitoring Configuration​

network_monitoring:
  flow_logs:
    enabled: true
    retention: 30d
    destinations:
      - security_analytics
      - audit_logs

  metrics:
    collection_interval: 1m
    retention: 90d
    alerts:
      - high_error_rate
      - unusual_traffic
      - port_scanning

  security_events:
    sources:
      - waf_logs
      - vpc_flow_logs
      - security_groups
    retention: 365d

Best Practices​

Network Security​

  1. Defense in depth
  2. Least privilege access
  3. Network segmentation
  4. Regular security audits

Access Control​

  1. Strong authentication
  2. Role-based access
  3. Access monitoring
  4. Regular review

Encryption​

  1. In-transit encryption
  2. Strong protocols
  3. Certificate management
  4. Key rotation

Monitoring​

  1. Comprehensive logging
  2. Real-time monitoring
  3. Incident response
  4. Regular review