入口网关后面的单个服务的 istio JWT 身份验证

istio JWT authentication for single service behind ingress gateway

我在 AKS (v1.16.13) 上有 2 个服务 运行 并部署了以下 istio (v1.7.3) 配置。第一个是 UI,我在其中调用 OIDC 流程并获取 JWT 令牌,第二个是后端服务,它应该需要有效的 JWT 令牌。

apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: myapp-gateway
  namespace: "istio-system"
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - myapp.com
    port:
      name: http-myapp
      number: 80
      protocol: HTTP
    tls:
      httpsRedirect: true
  - hosts:
    - myapp.com
    port:
      name: https-myapp
      number: 443
      protocol: HTTPS
    tls:
      credentialName: myapp-credential
      mode: SIMPLE
---
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: myapp
  namespace: myapp
spec:
  gateways:
  - istio-system/myapp-gateway
  hosts:
  - myapp.com
  http:
  - match:
    - uri:
        prefix: /ui
    route:
    - destination:
        host: myapp-ui.myapp.svc.cluster.local
        port:
          number: 4200
  - match:
    - uri:
        prefix: /backend/
    rewrite:
      uri: /
    route:
    - destination:
        host: myapp-service-backend.myapp.svc.cluster.local
        port:
          number: 8080
---
apiVersion: security.istio.io/v1beta1
kind: RequestAuthentication
metadata:
  name: myapp-jwt-backend
  namespace: myapp
spec:
  jwtRules:
  - issuer: https://oktapreview.com
  selector:
    matchLabels:
      app: myapp-service-backend

使用该配置,如果我调用 myapp.com/backend,我希望得到 401,但事实并非如此。请求身份验证未启动。

经过进一步研究 (https://discuss.istio.io/t/cannot-use-jwt-policy-with-an-externalname-virtualservice-target/2794/3),我发现我无法在 VirtualService 上应用 RequestAuthentication,而只能在 Gateway 上应用,这对我来说很奇怪但没问题。我已将 RequestAuthentication 更改为以下内容,但在调用后端后仍然没有任何变化:

apiVersion: security.istio.io/v1beta1
kind: RequestAuthentication
metadata:
  name: myapp-jwt-backend
  namespace: istio-system
spec:
  jwtRules:
  - issuer: https://oktapreview.com
  selector:
    matchLabels:
      istio: myapp-gateway

您知道如何为我的用例设置 istio 吗?假设 RequestAuthentication 可以在网关上运行,我需要 2 个网关吗? 1 个用于 UI,第二个用于后端?好像有点矫枉过正了。

感谢 sachin 的评论并再次浏览文档让我意识到我需要在 RequestAuthentication 之上使用 AuthorizationPolicy:

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:    
  name: myapp-require-jwt-backend
spec:
  action: ALLOW
  rules:
  - from:
    - source:
        requestPrincipals:
        - https://xxx/*
  selector:
    matchLabels:
      app: myapp-service-backend

请求身份验证只是确保在提供 JWT 令牌时,它必须是有效的。如果没有token,就直接通过请求。