k8s-cpu-limits-not-set: CPU limits not set in Deployments

id: k8s-cpu-limits-not-set

info:
  name: CPU limits not set in Deployments
  author: princechaddha
  severity: medium
  description: Checks for missing CPU limits in Kubernetes Deployments, which can lead to excessive CPU usage and affect other applications
  impact: |
    Missing CPU limits in Kubernetes Deployments can cause excessive CPU usage that can starve other applications, leading to performance degradation across the cluster.
  remediation: |
    Set CPU limits for all containers in Kubernetes Deployments to ensure fair CPU resource distribution and prevent performance issues.
  reference:
    - https://kubernetes.io/docs/tasks/configure-pod-container/assign-cpu-resource/
  tags: cloud,devops,kubernetes,k8s,devsecops,deployments,k8s-cluster-security

flow: |
  code(1);
  for (let deployment of template.items) {
    set("deployment",deployment)
    javascript(1);
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: kubectl get deployments --all-namespaces --output=json
    extractors:
      - type: json
        name: items
        internal: true
        json:
          - '.items[]'

javascript:
  - code: |
        deployment = JSON.parse(template.deployment);
        if (!deployment.spec.template.spec.containers.some(container => container.resources && container.resources.limits && container.resources.limits.cpu)) {
          let result = (`Deployment '${deployment.metadata.name}' in namespace '${deployment.metadata.namespace}' lacks CPU limits.`);
          Export(result);
        }

    extractors:
      - type: dsl
        dsl:
          - response
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