You can centrally define role-based authorization within Kommander to control resource access on the management cluster and a set or all of the target clusters. These resources are similar to Kubernetes RBAC but with crucial differences, and they make it possible to define the roles and policies once and have them federated to clusters within a given scope.
Kommander has two conceptual groups of resources that are used to manage access control:
- Kommander Roles: control access to resources on the management cluster.
- Cluster Roles: control access to resources on all target clusters in scope.
Use these two groups of resources to manage access control within 3 levels of scope:
|Context||Kommander Roles||Cluster Roles|
|Global||Create ClusterRoles on the management cluster.||Federates ClusterRoles on all target clusters across all workspaces.|
|Workspace||Create namespaced Roles on the management cluster in the workspace namespace.||Federates ClusterRoles on all target clusters in the workspace.|
|Project||Create namespaced Roles on the management cluster in the project namespace.||Federates namespaced Roles on all target clusters in the project in the project namespace.|
The policies for each level and type create RoleBindings or ClusterRoleBindings on the clusters that apply to each category.
This approach gives you maximum flexibility over who has access to what resources, conveniently mapped to your existing identity providers’ claims.
Special Limitation for Kommander Roles
In addition to granting a Kommander Role, you must also grant the appropriate dkp role to allow external users and groups into the UI. See RBAC - Kommander Dashboard Authorization for details about the built-in dkp roles. Here are examples of ClusterRoleBindings that grant an IDP group admin access to the Kommander routes:
--- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: eng-kommander-dashboard labels: "workspaces.kommander.mesosphere.io/rbac": "" roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: dkp-kommander-admin subjects: - apiGroup: rbac.authorization.k8s.io kind: Group name: oidc:engineering --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: eng-dkp-routes labels: "workspaces.kommander.mesosphere.io/rbac": "" roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: dkp-admin subjects: - apiGroup: rbac.authorization.k8s.io kind: Group name: oidc:engineering
Types of Access Control Objects
Kubernetes role-based access control can be controlled with three different object categories: Groups, Roles and Policies, as explained in more detail below.
You can map group and user claims made by your configured identity providers to Kommander groups by clicking the Groups tab under Administration / Identity providers on the global level.
ClusterRoles are named collections of rules defining which verbs can be applied to which resources.
- Kommander Roles apply specifically to resources on the management cluster.
- Cluster Roles apply to target clusters within their scope: at the global level, this is all target clusters in all workspaces, at the workspace level this is all target clusters in the workspace, at the project level this is all target clusters that have been added to the project.
Propagating Workspace Roles to Projects
By default, users granted the Kommander Workspace Admin, Edit, or View roles will also be granted the equivalent Kommander Project Admin, Edit, or View role for any project created in the workspace. Other workspace roles are not automatically propagated to the equivalent role for a project in the workspace.
Each workspace has roles defined using
Automatic propagation is controlled using the annotation
"workspace.kommander.mesosphere.io/sync-to-project": "true" on a
You can manage this only by using the CLI.
kubectl get kommanderworkspaceroles -n test-qznrn-6sz52
NAME DISPLAY NAME AGE kommander-workspace-admin Kommander Workspace Admin Role 2m18s kommander-workspace-edit Kommander Workspace Edit Role 2m18s kommander-workspace-view Kommander Workspace View Role 2m18s
To prevent propagation of the
kommander-workspace-view role, remove this annotation from the
kubectl annotate kommanderworkspacerole -n test-qznrn-6sz52 kommander-workspace-view workspace.kommander.mesosphere.io/sync-to-project-
To enable propagation of the role, add this annotation to the relevant
kubectl annotate kommanderworkspacerole -n test-qznrn-6sz52 kommander-workspace-view workspace.kommander.mesosphere.io/sync-to-project=true
Special Limitation for Workspace > Project Role Inheritance
When granting users access to a workspace, you must manually grant access to the projects within that workspace.
Each project is created with a set of admin/edit/view roles, and you can choose to add an additional RoleBinding to each group or user of the workspace for one of these project roles.
Usually these are prefixed
Here is an example RoleBinding that grants the Kommander Project Admin role for the project namespace to the engineering group:
apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: workspace-admin-project1-admin namespace: my-project-namespace-xxxxx roleRef: apiGroup: rbac.authorization.k8s.io kind: Role name: kommander-project-admin-xxxxx subjects: - apiGroup: rbac.authorization.k8s.io kind: Group name: oidc:engineering
Kommander policies, cluster policies and project policies bind a Kommander group to any number of roles. All groups that have been defined in the groups tab will be present at the global, workspace, or project level and are ready for you to assign roles to them.