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ONTAP Tools 10: How to configure secure TLS Cipher Suites and Firewall Rules

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Applies to

  • ONTAP Tools for VMware vSphere (OTV) 10.x

Description

Note: There is a script available that will perform the steps outlined in the procedure.

This KB describes how to harden OTV 10.x by: 

  • Restricting access to sensitive Kubernetes/etcd ports using persistent host firewall rules
  • Configuring recommended TLS cipher suites for Kubernetes API server, kubelet, and etcd 

This covers ports: 

  • 6443/TCP - Kubernetes API server 
  • 9345/TCP - RKE2 supervisor / node registration 
  • 10250/TCP - kubelet API 
  • 2379/TCP - etcd client 
  • 2380/TCP - etcd peer 

Applicable OTV Network Addresses 

Depending on deployment and routing, these ports may be reachable on: 

  • OTV / ONTAP tools IP address (Gateway UI IP)
  • Node interconnect IP address (HA / internal)
  • Generic VM/node IP address 

Note: Use the IP(s) applicable to your setup when validating rules and TLS. 

Recommended Cipher Suites (Baseline) 

Use these strong TLS 1.2 AEAD cipher suites where supported: 

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256

Note: The certificate type presented by an endpoint affects which suites can be negotiated/observed. 

Note: Logging into the OTV10 remote diagnostics shell with the diag user will provide you the ability to perform the tasks outlined in this article

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