Description

When you use Dataproc, cluster and job data is stored on Persistent Disks (PDs) associated with the Compute Engine VMs in your cluster and in a Cloud Storage staging bucket. This PD and bucket data is encrypted using a Google-generated data encryption key (DEK) and key encryption key (KEK). The CMEK feature allows you to create, use, and revoke the key encryption key (KEK). Google still controls the data encryption key (DEK).

Rationale

Cloud services offer the ability to protect data related to those services using encryption keys managed by the customer within Cloud KMS. These encryption keys are called customer-managed encryption keys (CMEK). When customers protect data in Google Cloud services with CMEK, the CMEK key is within the customer’s control.

Remediation

From the console

1. Log in to the GCP Console and navigate to the Dataproc Cluster page by visiting https://console.cloud.google.com/dataproc/clusters.
2. Select the project from the projects dropdown list.
3. On the Dataproc Cluster page, click on the Create Cluster to create a new cluster with customer-managed encryption keys.
4. On the Create a cluster page, perform the following steps:
   1. Inside Set up cluster section perform these steps:
      1. In the Name textbox, provide a name for your cluster.
      2. From Location select the location in which you want to deploy a cluster.
      3. Configure other configurations as per your requirements.
   2. Inside Configure Nodes and Customize cluster section configure the settings as per your requirements.
   3. Inside the Manage security section, perform these steps:
      1. From Encryption, select Customer-managed key.
      2. Select a customer-managed key from dropdown list.
      3. Ensure that the selected KMS Key has the Cloud KMS CryptoKey Encrypter/Decrypter role assigned to the Dataproc Cluster service account (serviceAccount:service-<project_number>@compute-system.iam.gserviceaccount.com).
      4. Click on Create to create a cluster.
5. Once the cluster is created, migrate all of your workloads from the old cluster to the new cluster and delete the old cluster by performing the following steps:
   1. On the Clusters page, select the old cluster and click on Delete cluster.
   2. On the Confirm deletion window, click Confirm to delete the cluster.
6. Repeat the steps above for other Dataproc clusters available in the selected project.
7. Change the project from the project dropdown list and repeat the remediation procedure for other Dataproc clusters available in other projects.

From the command line

Before creating a cluster, ensure that the selected KMS Key has the Cloud KMS CryptoKey Encrypter/Decrypter role assigned to the Dataproc Cluster service account (serviceAccount:service-<project_number>@compute-system.iam.gserviceaccount.com).

Run the clusters create command to create a new cluster with a customer-managed key:

gcloud dataproc clusters create <cluster_name> --region=us-central1 --gce-pd-kms-key=<key_resource_name>

The above command creates a new cluster in the selected region. After the cluster is created, migrate all your workloads from the older cluster to the new cluster and run the clusters delete command to delete the cluster:

gcloud dataproc clusters delete <cluster_name> --region=us-central1

Repeat step no. 1 to create a new Dataproc cluster. Change the project by running the following command and repeat the remediation procedure for other projects:

gcloud config set project <project_ID>

References

1. https://cloud.google.com/docs/security/encryption/default-encryption