gcloud-data-access-audit-logs-not-enabled: Enable Data Access Audit Logs for Cloud Storage

id: gcloud-data-access-audit-logs-not-enabled

info:
  name: Enable Data Access Audit Logs for Cloud Storage
  author: princechaddha
  severity: medium
  description: |
    Ensure that Data Access audit logs are enabled for your Google Cloud Storage buckets and objects to track read, write, and admin operations. Data Access audit logs provide insights into resource usage and help ensure security, compliance, and effective troubleshooting.
  impact: |
    Without Data Access audit logs, tracking operations on storage resources becomes difficult, increasing the risk of undetected unauthorized access or non-compliance with security policies.
  remediation: |
    Enable Data Access audit logs for the "storage.googleapis.com" service in your project to monitor all read, write, and admin activities on Cloud Storage resources.
  reference:
    - https://cloud.google.com/logging/docs/audit
  tags: cloud,devops,gcp,gcloud,google-cloud-storage,audit-logs,security,gcp-cloud-config

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

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 projects get-iam-policy $projectId --format="json(auditConfigs)" | jq -r '.auditConfigs[]?.auditLogConfigs[]?.logType // "null"'

    matchers:
      - type: word
        words:
          - 'ADMIN_READ'
          - 'DATA_READ'
          - 'DATA_WRITE'
        condition: and

      - type: word
        words:
          - '"service": "allServices"'
        negative: true

    extractors:
      - type: dsl
        dsl:
          - '"Data Access audit logs are not enabled for the \"storage.googleapis.com\" service in project " + projectId'
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