Manage cluster security, authentication, and authorization for the Konvoy cluster

As Konvoy is based on Kubernetes, it uses Kubernetes security mechanisms. This includes role-based access control (RBAC) for determining which resources a user can access.

Users are identified through an OpenID Connect interface, which supports login using multiple connectors, including GitHub, Google, and LDAP.

Operator credentials

The cluster operator gets initial access using the username and password provided after running konvoy up or, for a running cluster, konvoy get ops-portal. To use these credentials, select Launch Console.

This same username and password provides access to the Ops Portal, including multiple dashboards for management of the cluster.

Only these credentials provide access to the Ops Portal. Adding additional Ops Portal users may be provided in a future release.

Client tokens

To configure kubectl to access the Kubernetes cluster, obtain a token from the web landing page, by selecting Generate Kubectl Token. Select an identity provider and cluster. As many of the backends provide single-sign on (SSO), you may already be signed in. Otherwise, you will be redirected to your identity provider’s web page to login. Once you have signed in, a page will show the commands required to configure kubectl to access the Konvoy cluster.

When the token expires, it is necessary to repeat the above process to obtain a fresh token. When refreshing a token, only the kubectl config set-credentials command needs to be executed with the new token.

Adding login connectors

Konvoy uses Dex to provide OpenID Connect single sign-on to the cluster.

Dex can be configured to use multiple connectors, including GitHub, LDAP, and SAML 2.0. The Dex Connector documentation describes how to configure different connectors. The configuration can be added as the values field in the dex addon.

Examples of tested configurations are described in the External Providers section.

Kubernetes Dashboard

When accessing the dashboard at /ops/portal/kubernetes, the authenticated user’s username and groups are impersonated for all request. Impersonation applies existing RBAC policies which govern access to the API server (kubectl) to the dashboard. The operator user has the cluster-admin role and has full access to all resources exposed by the Kubernetes dashboard. Users which are authenticated by external identity providers have no privileges. External users must be bound to Roles and ClusterRoles by their username or by any groups which they are members of. More information about Kubernetes RBAC can be found in the Kubernetes Documentation.

Addon Application Security Notices

Konvoy clusters manage Addon applications through a tool called “Kubeaddons”. Kubeaddons is implemented via Kubernetes CRDs and Controllers.

Kubeaddons uses “drivers” under the hood to deploy and manage Addons via the Controller, the default currently is Helm V2. The server component of Helm V2 is “Tiller” which is known historically to architecturally introduce some security problems to the cluster its installed on.

While Helm V2 remains a supported driver (Helm V3 should take over these responsibilities in later releases) Kubeaddons inherits the security issues present in any Tiller installation on the cluster. Great care needs to be taken with RBAC permissions for users and service accounts on Konvoy clusters. Operators should not provide RBAC permissions to create or manage Addon or ClusterAddon resources as these permissions essentially provide that user with cluster-admin.