gcloud-bucket-lock-not-configured: Configure Retention Policies with Bucket Lock for Log Buckets

id: gcloud-bucket-lock-not-configured

info:
  name: Configure Retention Policies with Bucket Lock for Log Buckets
  author: princechaddha
  severity: medium
  description: |
    Ensure that all retention policies attached to your Google Cloud log sink buckets are configured with the Bucket Lock feature. This prevents logging data from being overwritten or deleted and ensures compliance with data retention policies by locking the retention configuration.
  impact: |
    Without the Bucket Lock feature, retention policies can be modified or removed, potentially leading to accidental or unauthorized deletion of critical logging data.
  remediation: |
    Enable Bucket Lock on your Google Cloud log sink buckets to enforce retention policies and prevent changes to the data retention duration.
  reference:
    - https://cloud.google.com/storage/docs/bucket-lock
  tags: cloud,devops,gcp,gcloud,google-cloud-logging,retention,bucket-lock,security,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let sink of iterate(template.sinks)){
      sink = JSON.parse(sink);
      set("bucketName", sink.name)
      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 logging sinks list --project=$projectId --format="json(name,destination)"

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

  - engine:
      - sh
      - bash
    source: |
      gsutil retention get gs://$bucketName

    matchers:
      - type: word
        words:
          - 'no Retention Policy'

    extractors:
      - type: dsl
        dsl:
          - '"The bucket " + bucketName + " in project " + projectId + " does not have a configured retention policy with Bucket Lock."'
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