gcloud-gke-workload-identity-disabled: GKE Clusters Without Workload Identity Federation

id: gcloud-gke-workload-identity-disabled

info:
  name: GKE Clusters Without Workload Identity Federation
  author: princechaddha
  severity: medium
  description: |
    Ensure that Workload Identity Federation is enabled for your Google Kubernetes Engine (GKE) clusters to securely connect to Google Cloud APIs from Kubernetes workloads. Workload Identity Federation enhances security, simplifies access management, and eliminates the need for less secure methods like service account keys.
  impact: |
    Without Workload Identity Federation enabled, applications may rely on less secure authentication methods like service account keys, increasing the risk of credential exposure and unauthorized access to Google Cloud resources.
  remediation: |
    Enable Workload Identity Federation for your GKE clusters using:
    gcloud container clusters update CLUSTER_NAME --region=REGION --workload-pool=PROJECT_ID.svc.id.goog
  reference:
    - https://cloud.google.com/kubernetes-engine/docs/how-to/workload-identity
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/GKE/enable-workload-identity.html
  tags: cloud,devops,gcp,gcloud,gke,kubernetes,security,iam,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let cluster of iterate(template.clusters)){
      cluster = JSON.parse(cluster)
      set("clusterName", cluster.name)
      set("location", cluster.location)
      code(3)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud container clusters list --project $projectId --format="json(name,location)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud container clusters describe $clusterName --location $location --project $projectId --format="json(workloadIdentityConfig)"

    matchers:
      - type: word
        words:
          - "null"

    extractors:
      - type: dsl
        dsl:
          - '"GKE cluster " + clusterName + " in " + location + " of project " + projectId + " does not have Workload Identity Federation enabled"'
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