RBAC For kubernetes Dashboard - kubernetes

Question

I have a User "A". I have namespaces X,Y,Z. I have created a RBAC user role and role binding for user "A" who has access to Namespace "X".
I wanted to give the user "A" access to kubernetes dashboard (which is a role and role binding for Kube-System). But when I give the access for dashboard, user "A" is able to see all the namespaces.
But I want him to see only namespace X which he has access).
How could I go about this?

Answer 1

What's the version of your Dashboard? As far as I know, from 1.7 on, Dashboard has used more secure setup, It means, that by default it has the minimal set of privileges, that are required to make Dashboard work.
Anyway, you can check the privileges of the sa that used by Dashboard, make sure it has the minimal privileges, like this:
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: kubernetes-dashboard-minimal
namespace: kube-system
rules:
# Allow Dashboard to create 'kubernetes-dashboard-key-holder' secret.
- apiGroups: [""]
resources: ["secrets"]
verbs: ["create"]
# Allow Dashboard to create 'kubernetes-dashboard-settings' config map.
- apiGroups: [""]
resources: ["configmaps"]
verbs: ["create"]
# Allow Dashboard to get, update and delete Dashboard exclusive secrets.
- apiGroups: [""]
resources: ["secrets"]
resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs"]
verbs: ["get", "update", "delete"]
# Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map.
- apiGroups: [""]
resources: ["configmaps"]
resourceNames: ["kubernetes-dashboard-settings"]
verbs: ["get", "update"]
# Allow Dashboard to get metrics from heapster.
- apiGroups: [""]
resources: ["services"]
resourceNames: ["heapster"]
verbs: ["proxy"]
- apiGroups: [""]
resources: ["services/proxy"]
resourceNames: ["heapster", "http:heapster:", "https:heapster:"]
verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: kubernetes-dashboard-minimal
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: kubernetes-dashboard-minimal
subjects:
- kind: ServiceAccount
name: kubernetes-dashboard
namespace: kube-system
Then, create RBAC rules to give the full privileges for namespace X to A:
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
name: user-A-admin
namespace: X
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: A
Make sure user A doesn't have any other RBAC rules.