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Securing Kubernetes Dashboard Using GitHub Oauth
In this example we will deploy kubernetes dashboard and access it through ingress. Also secure the access with voyager external auth using github as auth provider.
Deploy Dashboard
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v1.8.3/src/deploy/recommended/kubernetes-dashboard.yaml
By default the dashboard configures HTTPS with a self signed certificate. We need to apply ingress.appscode.com/backend-tls: ssl verify none
annotation to kubernetes-dashboard
service so that haproxy pod can establish HTTPS connection with dashboard pod.
$ kubectl annotate service kubernetes-dashboard -n voyager ingress.appscode.com/backend-tls='ssl verify none'
Configure GitHub Oauth App
Configure github auth provider by following instructions provided here and generate client-id and client-secret.
Set Authorization callback URL
to https://<host:port>/oauth2/callback
. In this example it is set to https://voyager.appscode.ninja
.
Configure and Deploy Oauth Proxy
$ kubectl apply -f oauth2-proxy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
k8s-app: oauth2-proxy
name: oauth2-proxy
namespace: voyager
spec:
replicas: 1
selector:
matchLabels:
k8s-app: oauth2-proxy
template:
metadata:
labels:
k8s-app: oauth2-proxy
spec:
containers:
- args:
- --provider=github
- --email-domain=*
- --upstream=file:///dev/null
- --http-address=0.0.0.0:4180
- --cookie-secure=true
env:
- name: OAUTH2_PROXY_CLIENT_ID
value: ...
- name: OAUTH2_PROXY_CLIENT_SECRET
value: ...
- name: OAUTH2_PROXY_COOKIE_SECRET
value: ...
image: quay.io/pusher/oauth2_proxy:v3.1.0
imagePullPolicy: Always
name: oauth2-proxy
ports:
- containerPort: 4180
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: oauth2-proxy
name: oauth2-proxy
namespace: voyager
spec:
ports:
- name: http
port: 4180
protocol: TCP
targetPort: 4180
selector:
k8s-app: oauth2-proxy
Create TLS Secret
$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /tmp/tls.key -out /tmp/tls.crt -subj "/CN=voyager.appscode.ninja"
$ kubectl create secret tls tls-secret --key /tmp/tls.key --cert /tmp/tls.crt -n voyager
Deploy Ingress
$ kubectl apply -f auth-ingress.yaml
apiVersion: voyager.appscode.com/v1
kind: Ingress
metadata:
name: auth-ingress
namespace: voyager
spec:
tls:
- secretName: tls-secret
hosts:
- voyager.appscode.ninja
frontendRules:
- port: 443
auth:
oauth:
- host: voyager.appscode.ninja
authBackend: auth-be
authPath: /oauth2/auth
signinPath: /oauth2/start
paths:
- /
rules:
- host: voyager.appscode.ninja
http:
paths:
- path: /
backend:
service:
name: kubernetes-dashboard
port:
number: 443
- path: /oauth2
backend:
name: auth-be
service:
name: oauth2-proxy
port:
number: 4180
Access DashBoard
Now browse https://voyager.appscode.ninja, it will redirect you to GitHub login page. After successful login, it will redirect you to dashboard login page.
We will use token of an existing service-account replicaset-controller
to login dashboard. It should have permissions to see Replica Sets in the cluster. You can also create your own service-account with different roles.
$ kubectl describe serviceaccount -n voyager replicaset-controller
Name: replicaset-controller
Namespace: voyager
Labels: <none>
Annotations: <none>
Image pull secrets: <none>
Mountable secrets: replicaset-controller-token-b5mgw
Tokens: replicaset-controller-token-b5mgw
Events: <none>
$ kubectl describe secret replicaset-controller-token-b5mgw -n voyager
Name: replicaset-controller-token-b5mgw
Namespace: voyager
Labels: <none>
Annotations: kubernetes.io/service-account.name=replicaset-controller
kubernetes.io/service-account.uid=b53b12b6-693c-11e8-9cb8-8ee164da275a
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1006 bytes
namespace: 11 bytes
token: ...
Now use the token to login dashboard.