Namespace access control

Introduction

In authentication strategies other than anonymous Kiali supports limiting the namespaces that are accessible on a per-user basis. The anonymous authentication strategy does not support this, although you can still limit privileges when using an OpenShift cluster. See the access control section in Anonymous strategy.

To authorize namespaces, the standard Roles resources (or ClusterRoles) and RoleBindings resources (or ClusterRoleBindings) are used.

Kiali can only restrict or grant read access to namespaces as a whole. So, keep in mind that while the RBAC capabilities of the cluster are used to give access, Kiali won’t offer the same privilege granularity that the cluster supports. For example, a user that does not have privileges to get Kubernetes Deployments via typical tools (e.g. kubectl) would still be able to get some details of Deployments through Kiali when listing Workloads or when viewing detail pages, or in the Graph.

Some features allow creating or changing resources in the cluster (for example, the Wizards). For these write operations which may be sensitive, the users will need to have the required privileges in the cluster to perform updates - i.e. the cluster RBAC takes effect.

Granting access to namespaces

In general, Kiali will give read access to namespaces where the logged in user is allowed to “GET” its definition – i.e. the user is allowed to do a GET call to the api/v1/namespaces/{namespace-name} endpoint of the cluster API. Users granted the LIST verb would get access to all namespaces of the cluster (that’s a GET call to the api/v1/namespaces endpoint of the cluster API).

You, probably, will want to have this small ClusterRole to help you in authorizing individual namespaces in Kiali:

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: kiali-namespace-authorization
rules:
- apiGroups: [""]
  resources:
  - namespaces
  - pods/log
  verbs:
  - get

Once you have created this ClusterRole, you would authorize a namespace foobar to user john with the following RoleBinding:

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: authorize-ns-foobar-to-john
  namespace: foobar
subjects:
- kind: User
  name: john
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: kiali-namespace-authorization # The name of the ClusterRole created previously
  apiGroup: rbac.authorization.k8s.io

If you want to authorize a user to access all namespaces in the cluster, the most efficient way to do it is by creating a ClusterRole with the list verb for namespaces and bind it to the user using a ClusterRoleBinding:

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: kiali-all-namespaces-authorization
rules:
- apiGroups: [""]
  resources:
  - namespaces
  - pods/log
  verbs:
  - get
  - list
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: authorize-all-namespaces-to-john
subjects:
- kind: User
  name: john
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: kiali-all-namespaces-authorization
  apiGroup: rbac.authorization.k8s.io

Alternatively, you could also use the previously mentioned kiali-namespace-authorization rather than creating a new one with the list privilege, and it will work. However, Kiali will perform better if you grant the list privilege.

Granting write privileges to namespaces

Changing resources in the cluster can be a sensitive operation. Because of this, the logged in user will need to be given the needed privileges to perform any updates through Kiali. The following ClusterRole contains all read and write privileges that may be used in Kiali:

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: kiali-write-privileges
rules:
- apiGroups: [""]
  resources:
  - namespaces
  - pods
  - replicationcontrollers
  - services
  verbs:
  - patch
- apiGroups: ["extensions", "apps"]
  resources:
  - daemonsets
  - deployments
  - replicasets
  - statefulsets
  verbs:
  - patch
- apiGroups: ["batch"]
  resources:
  - cronjobs
  - jobs
  verbs:
  - patch
- apiGroups:
  - networking.istio.io
  - security.istio.io
  - extensions.istio.io
  - telemetry.istio.io
  - gateway.networking.k8s.io
  resources: ["*"]
  verbs:
  - get
  - list
  - watch
  - create
  - delete
  - patch

Similarly to giving access to namespaces, you can either use a RoleBinding to give read and write privileges only to specific namespaces, or use a ClusterRoleBinding to give privileges to all namespaces.