eks-cluster-logging: Kubernetes Cluster Logging

id: eks-cluster-logging

info:
  name: Kubernetes Cluster Logging
  author: princechaddha
  severity: low
  description: |
    Ensure that your Amazon Elastic Kubernetes Service (EKS) clusters have control plane logs enabled to publish API, audit, controller manager, scheduler and authenticator logs to AWS CloudWatch Logs.
  impact: |
    Without control plane logging enabled, you lose visibility into API requests, authentication attempts, and cluster operations, making it difficult to monitor, troubleshoot, and audit cluster activities.
  remediation: |
    Enable control plane logging for your EKS cluster by configuring all log types (api, audit, authenticator, controllerManager, scheduler) in the cluster configuration.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/aws/EKS/cluster-logging.html
    - https://docs.aws.amazon.com/eks/latest/userguide/control-plane-logs.html
  tags: cloud,devops,aws,amazon,eks,aws-cloud-config

variables:
  region: "us-east-1"

flow: |
  code(1)
  for(let cluster of iterate(template.clusters)){
    set("cluster", cluster)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      aws eks list-clusters --region $region --query 'clusters' --output json

    extractors:
      - type: json
        name: clusters
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      aws eks describe-cluster --region $region --name $cluster --query 'cluster.logging.clusterLogging[*].enabled' --output json

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "false"

      - type: word
        words:
          - "true"
        negative: true

    extractors:
      - type: dsl
        dsl:
          - '"EKS cluster " + cluster + " does not have control plane logging enabled"'
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