K8s Cluster Access Gcr Remediation

Triage and Remediation

Remediation

Remediation

Using Console

To minimize cluster access to read-only for GCR in GCP, you can follow the below steps:

Open the Google Cloud Console and select the GKE cluster for which you want to minimize the access.
Click on the "Edit" button for the cluster.
Scroll down to the "Security" section and click on "Add item" under the "Container Registry" subsection.
In the "Add members" field, enter the email addresses of the users or service accounts that you want to grant read-only access to.
In the "Role" field, select "Storage Object Viewer" from the dropdown menu.
Click on the "Save" button to save the changes.
Repeat steps 4-6 for each user or service account that you want to grant read-only access to.
Once you have added all the users or service accounts, click on the "Save" button to save the changes to the cluster.

By following these steps, you will be able to minimize the cluster access to read-only for GCR in GCP using the GCP console.

Using CLI

To minimize cluster access to read-only for GCR, you can follow these steps:

Open the Cloud Shell in your GCP console.

Run the following command to create a new Kubernetes cluster role:

kubectl create clusterrole read-only --verb=get,list,watch --resource=pods,endpoints,services,secrets

Run the following command to create a new Kubernetes cluster role binding:
```
kubectl create clusterrolebinding read-only-binding --clusterrole=read-only --user=<your-email-address>
```
Replace <your-email-address> with your GCP account email address.
Run the following command to grant the Kubernetes service account read-only access to the Google Container Registry:
```
gcloud projects add-iam-policy-binding <your-project-id> --member=serviceAccount:<your-project-id>@cloudbuild.gserviceaccount.com --role=roles/storage.objectViewer
```
Replace <your-project-id> with your GCP project ID.
Run the following command to verify that the Kubernetes service account has read-only access to the Google Container Registry:
```
gcloud auth activate-service-account --key-file=/var/run/secrets/kubernetes.io/serviceaccount/token
gcloud container images list
```
This will list all the images in your project's Google Container Registry. If you can see the list of images, it means that the Kubernetes service account has read-only access to the Google Container Registry.

By following these steps, you have minimized cluster access to read-only for GCR in GCP using GCP CLI.

Using Python

To minimize cluster access to read-only for GCR in GCP, you can follow these steps:

Open the Cloud Shell in your GCP console.
Install the necessary Python libraries by running the following command:
```
pip install google-cloud-storage google-auth
```

Create a Python script and import the necessary libraries:

from google.cloud import storage
from google.oauth2 import service_account

Set up the credentials for your GCP account:

credentials = service_account.Credentials.from_service_account_file(
    '/path/to/your/credentials.json')

Create a storage client using the credentials:

client = storage.Client(credentials=credentials)

Get the bucket that contains your GCR images:
```
bucket = client.get_bucket('gcr.io')
```

Set the bucket's IAM policy to allow read-only access for the cluster:

policy = bucket.get_iam_policy(requested_policy_version=3)
policy.bindings.append(
    {
        "role": "roles/storage.objectViewer",
        "members": {
            "serviceAccount:my-cluster-sa@my-project.iam.gserviceaccount.com"
        }
    }
)
bucket.set_iam_policy(policy)

Note: Replace my-cluster-sa@my-project.iam.gserviceaccount.com with the service account of your cluster.

Save the Python script and run it using the following command:
```
python <script_name>.py
```

This will minimize cluster access to read-only for GCR in GCP.

Using Terraform

# Service account used by your GKE nodes / cluster
resource "google_service_account" "gke_cluster_sa" {
  account_id   = "GKE_CLUSTER_SA_ID"        # e.g. "gke-node-sa"
  display_name = "GKE Cluster Service Account"
  project      = "PROJECT_ID"               # replace with your GCP project ID
}

# Grant read-only access to Container Registry (GCR) by giving
# Storage Object Viewer on the project to the cluster service account
resource "google_project_iam_member" "gke_gcr_readonly" {
  project = "PROJECT_ID"                    # replace with your GCP project ID
  role    = "roles/storage.objectViewer"
  member  = "serviceAccount:${google_service_account.gke_cluster_sa.email}"
}

This change does not force replacement of the cluster or the service account; it only adds an IAM binding.

Verification: terraform plan should show one new google_project_iam_member.gke_gcr_readonly to be added with role = "roles/storage.objectViewer" and member = "serviceAccount:...@...iam.gserviceaccount.com".

Triage and Remediation​

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Triage and Remediation

Remediation