Vulnerability Discussion

OpenShift allows administrators to define resource quotas on a namespace basis. This allows tailoring of the shared resources based on a project needs. However, when a new project is created, unless a default project resource quota is configured, that project will not have any limits or quotas defined. This could allow someone to create a new project and then deploy services that exhaust or overuse the shared cluster resources. Thus, it is necessary to ensure that there is a default resource quota configured for all new projects. A Cluster Admin may increase resource quotas on a given project namespace, if that project requires additional resources at any time.

Check

Check for Resource Quota. Verify a default project template is defined by executing the following:

oc get project.config.openshift.io/cluster -o jsonpath="{.spec.projectRequestTemplate.name}"

If no project request template is in use by the project config, this is a finding.

Verify the project template includes a default resource quota.

oc get templates/ -n openshift-config -o jsonpath="{.objects[?(.kind=='ResourceQuota')]}{'\n'}"

Replace with the name of the project request template returned from the earlier query.

If the project template is not defined, or there are no ResourceQuota definitions in it, this is a finding.

Fix

Configure a default resource quota to protect resource over utilization by performing the following steps:

1. Create a bootstrap project template (if not already created) by executing the following:

oc adm create-bootstrap-project-template -o yaml > template.yaml

2. Edit the template and add a ResourceQuota object definition before the parameters section.

- apiVersion: v1
kind: ResourceQuota
metadata:
name: example
spec:
hard:
persistentvolumeclaims: "10"
requests.storage: "50Gi"
...
parameters:

3. Apply the project template to the cluster by executing the following:

oc create -f template.yaml -n openshift-config

4. Set the default cluster project request template by executing the following:

oc patch project.config.openshift.io/cluster --type=merge -p '{"spec":{"projectRequestTemplate":{"name": ""}}}'

Details regarding the configuration of resource quotas can be reviewed at https://docs.openshift.com/container-platform/4.8/applications/quotas/quotas-setting-per-project.html.