istio从ext-auth排除服务

问题描述

大家好，我在minikube上设置了istio并在网关上设置了envoy ext-auth过滤器。我有两个运行在不同Pod中的微服务，将虚拟服务/ auther和/ appone暴露给外界。我设置的ext-auth过滤器会将每个单个请求发送到/ auther / auth进行身份验证，如果响应为200，则让该请求通过并到达其他所需的服务。 问题是istio正在向所有端点（甚至/ auther）验证每个单个请求。我想排除发送到/ auther的请求进行身份验证的请求（因为auther服务将自行处理身份验证）。但是它不起作用。 所以这是我的ext-auth过滤器：

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
Metadata:
  name: authn-filter
  namespace: istio-system
spec:
  workloadSelector:
    labels:
      istio: ingressgateway
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: GATEWAY
        listener:
          filterChain:
            filter:
              name: "envoy.http_connection_manager"
              subFilter:
                name: "envoy.router"
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.ext_authz
          typed_config:
            "@type": "type.googleapis.com/envoy.config.filter.http.ext_authz.v2.ExtAuthz"
            http_service:
              server_uri:
                uri: http://auther.default.svc.cluster.local
                cluster: outbound|3000||auther.default.svc.cluster.local
                timeout: 1.5s
              path_prefix: /auther/auth?user=
              authorizationRequest:
                allowedHeaders:
                  patterns:
                    - exact: "cookie"
                    - exact: "authorization"
              authorizationResponse:
                allowedClientHeaders:
                  patterns:
                    - exact: "set-cookie"
                    - exact: "authorization"

这是我试图实现的异常过滤器：

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
Metadata:
  name: bypass-filter
  namespace: default
spec:
  configPatches:
    # The first patch adds the lua filter to the listener/http connection manager
    - applyTo: HTTP_ROUTE
      match:
        context: GATEWAY
        routeConfiguration:
          vhost:
            name: auther
            route:
              name: auther
      patch:
        operation: MERGE
        value:
          typed_per_filter_config:
            envoy.ext_authz:
              "@type": type.googleapis.com/envoy.config.filter.http.ext_authz.v2.ExtAuthzPerRoute
              disabled: true

第一个过滤器工作正常。但是第二个将从身份验证ext-filter排除身份验证服务的服务无效。

解决方法

您已将@type设置为envoy.config.filter.http.ext_authz.v2.ExtAuthzPerRoute，但是正确的路径是envoy.extensions.filters.http.ext_authz.v3.ExtAuthzPerRoute。

此外，路由名称必须与虚拟服务中的名称匹配。并且必须将其作为istio-system部署到authn-filter命名空间。此配置对我有用：

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: bypass-authn
  namespace: istio-system
spec:
  workloadSelector:
    labels:
      istio: ingressgateway
  configPatches:
    - applyTo: HTTP_ROUTE
      match:
        routeConfiguration:
          vhost:
            route:
              name: my-route #from virtual service http route name
      patch:
        operation: MERGE
        value:
          name: envoy.ext_authz_disabled
          typed_per_filter_config:
            envoy.ext_authz:
              "@type": type.googleapis.com/envoy.extensions.filters.http.ext_authz.v3.ExtAuthzPerRoute
              disabled: true