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GCP Threats
Ensure Use Of VPC-Native Clusters
More Info:
Create Alias IPs for the node network CIDR range in order to subsequently configure IPbased policies and firewalling for pods. A cluster that uses Alias IPs is called a ‘VPC-native’ cluster
Risk Level
Medium
Address
Security, Reliability, Operational Excellence, Performance Efficiency
Compliance Standards
CISGKE
Triage and Remediation
Remediation
To remediate the misconfiguration of not using VPC-Native Clusters in GCP, you can follow the below steps using the GCP console:
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Open the GCP console and navigate to the Kubernetes Engine page.
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Select your cluster that you want to make VPC-native.
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Click on the “Edit” button at the top of the page.
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Scroll down to the “Networking” section and click on “Enable VPC-native (using alias IP)”.
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Select the VPC network that you want to use for your cluster.
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Select the subnet that you want to use for your cluster.
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Click on the “Save” button at the bottom of the page to apply the changes.
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Verify that the VPC-native configuration is applied by checking the “Networking” section of your cluster details page.
By following these steps, you will be able to remediate the misconfiguration of not using VPC-Native Clusters in GCP and ensure that your cluster is using VPC-native networking.
To remediate the misconfiguration “Ensure Use Of VPC-Native Clusters” for GCP using GCP CLI, follow the below steps:
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Open the GCP Cloud Shell.
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Run the following command to enable VPC-native clusters for the default network:
gcloud container clusters update [CLUSTER_NAME] --zone [ZONE] --enable-ip-alias
Replace [CLUSTER_NAME] with the name of the cluster that you want to update and [ZONE] with the zone in which the cluster is located.
- Run the following command to verify that the VPC-native clusters are enabled:
gcloud container clusters describe [CLUSTER_NAME] --zone [ZONE] | grep -i ipallocationpolicy
This command will display the IP allocation policy for the cluster. If the IP allocation policy is “Use IP aliases”, then VPC-native clusters are enabled.
- Repeat the above steps for all the GCP clusters in your environment.
By following the above steps, you can ensure the use of VPC-native clusters in GCP using GCP CLI.
To remediate the misconfiguration “Ensure Use Of VPC-Native Clusters” for GCP using Python, you can follow the below steps:
- Install the necessary Python libraries:
pip install google-auth google-auth-oauthlib google-auth-httplib2 google-cloud-container google-cloud-storage
- Authenticate with GCP using a service account:
from google.oauth2 import service_account
credentials = service_account.Credentials.from_service_account_file('path/to/service_account.json')
- Import the necessary libraries:
from google.cloud import container_v1
from google.cloud.container_v1.types import Cluster
client = container_v1.ClusterManagerClient(credentials=credentials)
- Get the list of existing clusters in the project:
project_id = 'your-project-id'
zone = 'your-zone'
cluster_list = client.list_clusters(project_id, zone)
- Check if each cluster is VPC-native or not:
for cluster in cluster_list.clusters:
if not cluster.ip_allocation_policy.use_ip_aliases:
# Update the cluster to use VPC-native
cluster.ip_allocation_policy.use_ip_aliases = True
update_request = Cluster(name=cluster.name, ip_allocation_policy=cluster.ip_allocation_policy)
operation = client.update_cluster(project_id, zone, update_request)
operation.result()
- After running the script, all the clusters that are not VPC-native would be updated to use VPC-native.
Note: Make sure to replace ‘your-project-id’ and ‘your-zone’ with the actual project ID and zone where your GKE clusters are located. Also, make sure to have the necessary permissions to update the clusters.