k8s-etcd-cafile-set: Ensure etcd-cafile argument set

id: k8s-etcd-cafile-set

info:
  name: Ensure etcd-cafile argument set
  author: princechaddha
  severity: medium
  description: Checks if the etcd-cafile argument is properly set in the etcd configuration, crucial for secure client connections to etcd.
  impact: |
    Without specifying the etcd-cafile argument, etcd might not establish secure and authenticated connections, leading to potential security breaches.
  remediation: |
    Configure etcd to use an etcd-cafile argument that points to a valid CA certificate bundle. This setting should be part of the etcd startup arguments or in its configuration file.
  reference:
    - https://etcd.io/docs/v3.5/op-guide/security/
  tags: cloud,devops,kubernetes,devsecops,etcd,k8s,k8s-cluster-security

variables:
  argument: "etcd-cafile"

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-cafile"
        negative: true

    extractors:
      - type: dsl
        dsl:
          - '"Etcd configuration is missing the " + argument + " argument"'
# digest: 4a0a00473045022100aa97336e7c860d64a098b48246981195a861cb3f16038a6a77881a0ce5af138602204efe8d546f3b736154378a7e2accc9dbbe807ecc77c3cefc8d8468be51ed96e6:922c64590222798bb761d5b6d8e72950