Control: ClusterRoles permissions for managing the configuration of validation or mutation admission webhooks should be minimized
Description
Minimize the permissions granted to ClusterRoles for managing admission webhooks. It is recommended to follow the principle of least privilege to enhance security.
Usage
Run the control in your terminal:
powerpipe control run kubernetes_compliance.control.cluster_role_with_validating_or_mutating_admission_webhook_configurations
Snapshot and share results via Turbot Pipes:
powerpipe loginpowerpipe control run kubernetes_compliance.control.cluster_role_with_validating_or_mutating_admission_webhook_configurations --share
SQL
This control uses a named query:
with role_with_escalate as ( select uid, count(*) as num from kubernetes_cluster_role, jsonb_array_elements(rules) rule where rule -> 'apiGroups' @> '["admissionregistration.k8s.io"]' and ( rule -> 'resources' @> '["mutatingwebhookconfigurations"]' or rule -> 'resources' @> '["validatingwebhookconfigurations"]' ) and rule -> 'verbs' @> '["create", "update", "patch"]' group by uid)select coalesce(r.uid, concat(r.path, ':', r.start_line)) as resource, case when e.num > 0 then 'alarm' else 'ok' end as status, case when e.num > 0 then name || ' contains ' || e.num || ' RBAC cluster role validating or mutating admission webhook configurations permissions.' else name || ' does not contain any bind role bindings or cluster role validating or mutating admission webhook configurations permissions.' end as reason, name as role_name , coalesce(context_name, '') as context_name, source_type, coalesce(path || ':' || start_line || '-' || end_line, '') as pathfrom kubernetes_cluster_role as r left join role_with_escalate as e on e.uid = r.uid;