Alauda Container Platform

Use OAuth Proxy with ALB

Overview

This document demonstrates how to use OAuth Proxy with ALB to implement external authentication.

Steps

Follow these steps to use the feature:

  1. Deploy kind
kind create cluster --name alb-auth --image=kindest/node:v1.28.0
kind get kubeconfig --name=alb-auth > ~/.kube/config
  1. Deploy alb
helm repo add alb https://alauda.github.io/alb/;helm repo update;helm search repo|grep alb
helm install alb-operator alb/alauda-alb2
alb_ip=$(docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' alb-auth-control-plane)
echo $alb_ip
cat <<EOF | kubectl apply -f -
apiVersion: crd.alauda.io/v2
kind: ALB2
metadata:
    name: alb-auth
spec:
    address: "$alb_ip"
    type: "nginx" 
    config:
        networkMode: host
        loadbalancerName: alb-demo
        projects:
        - ALL_ALL
        replicas: 1
EOF
  1. Deploy test application
  • Create github oauth app
    • Note that $GITHUB_CLIENT_ID $GITHUB_CLIENT_SECRET will be obtained in this step, which needs to be set in the environment variable
  • Configure dns
    • Here we use echo.com as the application domain, auth.alb.echo.com and alb.echo.com
  • Deploy oauth-proxy

oauth2-proxy needs to access github, which may require setting the HTTPS_PROXY environment variable

COOKIE_SECRET=$(python -c 'import os,base64; print(base64.urlsafe_b64encode(os.urandom(32)).decode())')
OAUTH2_PROXY_IMAGE="quay.io/oauth2-proxy/oauth2-proxy:v7.7.1"
kind load docker-image $OAUTH2_PROXY_IMAGE --name alb-auth
cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: oauth2-proxy
  name: oauth2-proxy
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: oauth2-proxy
  template:
    metadata:
      labels:
        k8s-app: oauth2-proxy
    spec:
      containers:
        - args:
            - --http-address=0.0.0.0:4180
            - --redirect-url=http://auth.alb.echo.com/oauth2/callback
            - --provider=github
            - --whitelist-domain=.alb.echo.com
            - --email-domain=*
            - --upstream=file:///dev/null
            - --cookie-domain=.alb.echo.com
            - --cookie-secure=false
            - --reverse-proxy=true
          env:
            - name: OAUTH2_PROXY_CLIENT_ID
              value: $GITHUB_CLIENT_ID
            - name: OAUTH2_PROXY_CLIENT_SECRET
              value: $GITHUB_CLIENT_SECRET
            - name: OAUTH2_PROXY_COOKIE_SECRET
              value: $COOKIE_SECRET
          image: $OAUTH2_PROXY_IMAGE
          imagePullPolicy: IfNotPresent
          name: oauth2-proxy
          ports:
          - containerPort: 4180
            name: http
            protocol: TCP
          - containerPort: 44180
            name: metrics
            protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: oauth2-proxy
  name: oauth2-proxy
spec:
 ports:
 - appProtocol: http
   name: http
   port: 80
   protocol: TCP
   targetPort: http
 - appProtocol: http
   name: metrics
   port: 44180
   protocol: TCP
   targetPort: metrics
 selector:
   k8s-app: oauth2-proxy
EOF
  1. Configure ingress
  • We will configure two ingresses, auth.alb.echo.com and alb.echo.com
cat <<EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/auth-url: "https://auth.alb.echo.com/oauth2/auth"
    nginx.ingress.kubernetes.io/auth-signin: "https://auth.alb.echo.com/oauth2/start?rd=http://\$host\$request_uri"
  name: echo-resty
spec:
  ingressClassName: alb-auth
  rules:
    - host: alb.echo.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: echo-resty
                port:
                  number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: oauth2-proxy
spec:
  ingressClassName: alb-auth
  rules:
    - host: auth.alb.echo.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: oauth2-proxy 
                port:
                  number: 80
EOF

Result

  • After the operation is complete, an alb, oauth-proxy, and test application will be deployed.
  • After accessing alb.echo.com, you will be redirected to the github authentication page, and after verification, you can see the output of the application
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