k8s-etcd-files-set: Ensure etcd cert and key set

id: k8s-etcd-files-set

info:
  name: Ensure etcd cert and key set
  author: princechaddha
  severity: medium
  description: Checks if the etcd-certfile and etcd-keyfile arguments are properly set in the etcd server configuration, crucial for secure communication.
  impact: |
    If the etcd-certfile and etcd-keyfile arguments are not set, the etcd server might not encrypt its communications, potentially allowing unauthorized access to sensitive data.
  remediation: |
    Configure the etcd server to use etcd-certfile and etcd-keyfile arguments that point to valid certificate and key files respectively. This ensures that communications to and from the etcd server are properly encrypted.
  reference:
    - https://etcd.io/docs/v3.4.0/op-guide/security/
  tags: cloud,devops,kubernetes,devsecops,etcd,k8s,k8s-cluster-security

variables:
  argument: "etcd-certfile or etcd-keyfile"

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      kubectl get pods -n kube-system -l component=etcd -o jsonpath="{.items[*].spec.containers[*].command}"

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'etcd'

      - type: word
        words:
          - "etcd-certfile"
          - "etcd-keyfile"
        negative: true

    extractors:
      - type: dsl
        dsl:
          - '"etcd server configuration is missing the " + argument + " arguments."'
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