# oauth2-proxy — GitHub OAuth login in front of the dsh-gateway.
#
# Runs as a reverse proxy: it authenticates the browser against GitHub
# (restricted to a configured organization), then forwards the request to
# the dsh-gateway Service with the authenticated identity in X-Forwarded-User
# (plus X-Auth-Request-* via --set-xauthrequest). The gateway trusts that
# header only when AUTH_PROXY_HEADER is set on its Deployment.
#
# ENABLING SSO TAKES BOTH SIDES (see ../../../exposure/README.md):
#   1. Set AUTH_PROXY_HEADER=X-Forwarded-User on deploy/dsh-gateway, otherwise
#      the gateway ignores the header and the login is cosmetic:
#        kubectl -n dsh-demo set env deploy/dsh-gateway \
#          AUTH_PROXY_HEADER=X-Forwarded-User COOKIE_SECURE=true
#   2. Make dsh-gateway reachable ONLY through this proxy: keep the Service
#      ClusterIP, route browser traffic through 71-httproute.yaml, and do not
#      apply ../ingress/ (or anything else that reaches the gateway). A
#      client that can reach dsh-gateway:8080 can spoof X-Forwarded-User and
#      impersonate any user.
#
# 75-networkpolicies.yaml enforces that boundary at the network layer: the
# gateway accepts traffic only from oauth2-proxy pods, oauth2-proxy only from
# the Gateway implementation, and oauth2-proxy egress is limited to DNS,
# public HTTPS and the gateway. Apply it with this variant.
#
# TLS terminates at the Gateway listener (70-gateway.yaml); keep
# --cookie-secure=true and COOKIE_SECURE=true on the gateway.
#
# The image is pinned to quay.io/oauth2-proxy/oauth2-proxy:v7.15.5
# (versions.env: OAUTH2_PROXY_IMAGE). Credentials come from the
# "oauth2-proxy" Secret (see 73-oauth2-proxy-secret.yaml.example); this
# manifest never carries secrets.
apiVersion: apps/v1
kind: Deployment
metadata:
  name: oauth2-proxy
  namespace: dsh-demo
  labels:
    app: oauth2-proxy
    app.kubernetes.io/part-of: dsh-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: oauth2-proxy
  template:
    metadata:
      labels:
        app: oauth2-proxy
        app.kubernetes.io/part-of: dsh-demo
    spec:
      # OPTIONAL: run the proxy under gVisor and/or pin it to a node pool.
      # See ../../../docs/optional-hardening.md.
      # runtimeClassName: gvisor
      # nodeSelector:
      #   dsh.example.com/node-pool: dsh
      securityContext:
        runAsNonRoot: true
        runAsUser: 2000
        runAsGroup: 2000
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: oauth2-proxy
          image: quay.io/oauth2-proxy/oauth2-proxy:v7.15.5
          imagePullPolicy: IfNotPresent
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop: ["ALL"]
          args:
            - --http-address=0.0.0.0:4180
            - --provider=github
            # TODO: replace with the GitHub organization allowed to sign in.
            - --github-org=your-github-org
            - --email-domain=*
            # Reverse-proxy target: the gateway backend Service.
            - --upstream=http://dsh-gateway:8080
            # Public callback (TLS terminates at the Gateway listener).
            # TODO: replace with the actual public FQDN.
            - --redirect-url=https://dsh-demo.example.com/oauth2/callback
            - --cookie-secure=true
            - --cookie-name=_oauth2_proxy
            # Also expose X-Auth-Request-User/Email/Groups upstream.
            - --set-xauthrequest
            # Single provider: skip the provider-selection page.
            - --skip-provider-button
          env:
            - name: OAUTH2_PROXY_CLIENT_ID
              valueFrom:
                secretKeyRef:
                  name: oauth2-proxy
                  key: client-id
            - name: OAUTH2_PROXY_CLIENT_SECRET
              valueFrom:
                secretKeyRef:
                  name: oauth2-proxy
                  key: client-secret
            - name: OAUTH2_PROXY_COOKIE_SECRET
              valueFrom:
                secretKeyRef:
                  name: oauth2-proxy
                  key: cookie-secret
          ports:
            - name: http
              containerPort: 4180
          livenessProbe:
            httpGet:
              path: /ping
              port: http
            initialDelaySeconds: 5
            periodSeconds: 10
            timeoutSeconds: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /ready
              port: http
            initialDelaySeconds: 5
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          resources:
            requests:
              cpu: 10m
              memory: 32Mi
            limits:
              cpu: 200m
              memory: 128Mi
---
apiVersion: v1
kind: Service
metadata:
  name: oauth2-proxy
  namespace: dsh-demo
  labels:
    app: oauth2-proxy
    app.kubernetes.io/part-of: dsh-demo
spec:
  selector:
    app: oauth2-proxy
  ports:
    - name: http
      port: 4180
      targetPort: http