Kubernetes - LDAP authentication with Dex

Kubernetes - LDAP authentication with Dex
- Docs
- Requirements
- Helm chart
- Login application
- Dex
  - CRD
  - Deployment

Docs

This deployment follows Dex by CoreOS & Kubernetes Documentations:

Requirements

DNS entries:
- dex.k8s.example.com --> Dex OIDC provider
- login.k8s.example.com --> Custom Login Application
Kubernetes cluster available with the following requirements:
- RBAC enabled
- OIDC authentication enabled. API server configuration:
  - --oidc-issuer-url=https://dex.k8s.example.com/dex: External Dex endpoint
  - --oidc-client-id=loginapp: ID for our Login Application
  - --oidc-ca-file=/etc/kubernetes/ssl/letsencrypt.pem: Letsencrypt CA file because we will use automatic certificate requests.
  - --oidc-username-claim=name: Map to nameAttr Dex configuration. This will be used by Kubernetes RBAC to authorize users based on their name.
  - oidc-groups-claim=groups: This will be used by Kubernetes RBAC to authorize users based on their groups.
- Ingress Controller available.
- Automatic certificate requests for Kubernetes (ex: https://github.com/jetstack/cert-manager)
An available LDAP server

Helm chart

Helm chart is available here.

Login application

Create the auth namespace:

kubectl create ns auth

Create resources:

# CA (letsencrypt) configmap
kubectl create -f ca-cm.yml
# Login App configuration
kubectl create -f loginapp-cm.yml
# Login App Ingress and SVC
kubectl create -f loginapp-ing-svc.yml
# Login App Deployment
kubectl create -f loginapp-deploy.yml

It should fail because Dex is not deployed.

Dex

CRD

We will use Kubernetes Custom Resource Definitions (https://kubernetes.io/docs/concepts/api-extension/custom-resources/) as Dex storage backend.

kubectl create -f dex-crd.yml

Deployment

Create Dex resources:

# Dex configuration
kubectl create -f dex-cm.yml
# Dex ingress and service
kubectl create -f dex-ing-svc.yml
# Dex deployment
kubectl create -f dex-deploy.yml

Now it should work: try https://login.k8s.example.org, login and retrieve k8s configuration.

kubectl --token=token get pods -n auth
Error from server (Forbidden): pods is forbidden: User "<oidc-issuer-url>#<name>" cannot list pods in the namespace "auth"

User prefix can be updated with the --oidc-username-prefix apiserver option.

Create ClusterRoleBinding resource:

kubectl create -f crb-all-auth.yml

Try again:

kubectl --token=$token get po
NAME                        READY     STATUS    RESTARTS   AGE
dex-6f6568d499-m89z6        1/1       Running   0          7m
loginapp-6474748f4b-gb5kb   1/1       Running   0          8m
loginapp-6474748f4b-prq25   1/1       Running   0          8m
loginapp-6474748f4b-vnvnb   1/1       Running   0          8m

License

ObjectifLibre/k8s-ldap

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