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OAuth2 Authentication Using Google

This example will demonstrate how to configure external authentication in both TLS and non-TLS mode using Google as auth provider.

Example using Google (no TLS)

First configure google auth provider by following instructions provided here and generate client-id and client-secret.

In this example Authorized JavaScript origins is set to http://voyager.appscode.ninja and Authorized redirect URIs is set to http://voyager.appscode.ninja/oauth2/callback.

Now deploy and expose a test server:

$ kubectl run test-server --image=gcr.io/google_containers/echoserver:1.8
$ kubectl expose deployment test-server --port=80 --target-port=8080

Configure, deploy and expose oauth2-proxy:

$ kubectl apply -f oauth2-proxy.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: oauth2-proxy
  name: oauth2-proxy
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: oauth2-proxy
  template:
    metadata:
      labels:
        k8s-app: oauth2-proxy
    spec:
      containers:
      - args:
        - --provider=google
        - --email-domain=*
        - --upstream=file:///dev/null
        - --http-address=0.0.0.0:4180
        - --cookie-secure=false
        - --pass-authorization-header=true
        - --set-authorization-header=true
        - --set-xauthrequest=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: default
spec:
  ports:
  - name: http
    port: 4180
    protocol: TCP
    targetPort: 4180
  selector:
    k8s-app: oauth2-proxy

Here, --set-xauthrequest flag sets X-Auth-Request-User and X-Auth-Request-Email headers, which will be forwarded to backend. --pass-authorization-header and --set-authorization-header set OIDC IDToken via Authorization Bearer header and X-Auth-Request-Id-Token header.

Finally create the ingress:

$ kubectl apply -f auth-ingress.yaml

apiVersion: voyager.appscode.com/v1
kind: Ingress
metadata:
  name: auth-ingress
  namespace: default
spec:
  frontendRules:
  - port: 80
    auth:
      oauth:
      - host: voyager.appscode.ninja
        authBackend: auth-be
        authPath: /oauth2/auth
        signinPath: /oauth2/start
        paths: 
        - /app
  rules:
  - host: voyager.appscode.ninja
    http:
      paths:
      - path: /health
        backend:
          service:
            name: test-server
            port:
              number: 80
      - path: /app
        backend:
          service:
            name: test-server
            port:
              number: 80
      - path: /oauth2
        backend:
          name: auth-be
          service:
            name: oauth2-proxy
            port:
              number: 4180

Now browse the followings:

http://voyager.appscode.ninja/app (external-auth required)
http://voyager.appscode.ninja/health (external-auth not required)

Example using Google (with TLS)

First configure google auth provider by following instructions provided here and generate client-id and client-secret.

In this example Authorized JavaScript origins is set to https://voyager.appscode.ninja and Authorized redirect URIs is set to https://voyager.appscode.ninja/oauth2/callback.

Now deploy and expose a test server:

$ kubectl run test-server --image=gcr.io/google_containers/echoserver:1.8
$ kubectl expose deployment test-server --port=80 --target-port=8080

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

Configure, deploy and expose oauth2-proxy:

$ kubectl apply -f oauth2-proxy.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: oauth2-proxy
  name: oauth2-proxy
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: oauth2-proxy
  template:
    metadata:
      labels:
        k8s-app: oauth2-proxy
    spec:
      containers:
      - args:
        - --provider=google
        - --email-domain=*
        - --upstream=file:///dev/null
        - --http-address=0.0.0.0:4180
        - --cookie-secure=true
        - --set-xauthrequest=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: default
spec:
  ports:
  - name: http
    port: 4180
    protocol: TCP
    targetPort: 4180
  selector:
    k8s-app: oauth2-proxy

Finally create the ingress:

$ kubectl apply -f auth-ingress.yaml

apiVersion: voyager.appscode.com/v1
kind: Ingress
metadata:
  name: auth-ingress
  namespace: default
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: 
        - /app
  rules:
  - host: voyager.appscode.ninja
    http:
      paths:
      - path: /health
        backend:
          service:
            name: test-server
            port:
              number: 80
      - path: /app
        backend:
          service:
            name: test-server
            port:
              number: 80
      - path: /oauth2
        backend:
          name: auth-be
          service:
            name: oauth2-proxy
            port:
              number: 4180

Now browse the followings:

https://voyager.appscode.ninja/app (external-auth required)
https://voyager.appscode.ninja/health (external-auth not required)

KubeDB

Stash

KubeVault

Voyager

ConfigSyncer

Guard

RESOURCES

Ingress

Cert Manager

Voyager Operator

Voyager CLI

OAuth2 Authentication Using Google

Example using Google (no TLS)

Example using Google (with TLS)

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