2.3. 保护 Service Mesh

授权策略和 mTLS 允许您保护 Service Mesh。

流程

确保租户的所有 Red Hat OpenShift Serverless 项目都与成员位于同一个 ServiceMeshMemberRoll 对象中：

apiVersion: maistra.io/v1
kind: ServiceMeshMemberRoll
metadata:
 name: default
 namespace: istio-system
spec:
 members:
   - knative-serving    # static value, needs to be here, see setup page
   - knative-eventing   # static value, needs to be here, see setup page
   - team-alpha-1       # example OpenShift project that belongs to the team-alpha tenant
   - team-alpha-2       # example OpenShift project that belongs th the team-alpha tenant
   - team-bravo-1       # example OpenShift project that belongs to the team-bravo tenant
   - team-bravo-2       # example OpenShift project that belongs th the team-bravo tenant

apiVersion: maistra.io/v1
kind: ServiceMeshMemberRoll
metadata:
 name: default
 namespace: istio-system
spec:
 members:
   - knative-serving    # static value, needs to be here, see setup page
   - knative-eventing   # static value, needs to be here, see setup page
   - team-alpha-1       # example OpenShift project that belongs to the team-alpha tenant
   - team-alpha-2       # example OpenShift project that belongs th the team-alpha tenant
   - team-bravo-1       # example OpenShift project that belongs to the team-bravo tenant
   - team-bravo-2       # example OpenShift project that belongs th the team-bravo tenant

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属于网格的所有项目都必须在严格的模式下强制使用 mTLS。这会强制 Istio 只接受与 client-certificate 存在的连接，并允许 Service Mesh sidecar 使用 AuthorizationPolicy 对象验证源。

使用 knative-serving 和 knative-eventing 命名空间中的 AuthorizationPolicy 对象创建配置：

knative-default-authz-policies.yaml 配置文件示例

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: deny-all-by-default
  namespace: knative-eventing
spec: { }
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: deny-all-by-default
  namespace: knative-serving
spec: { }
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-mt-channel-based-broker-ingress-to-imc-dispatcher
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "imc-dispatcher"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/mt-broker-ingress" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-mt-channel-based-broker-ingress-to-kafka-channel
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-channel-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/mt-broker-ingress" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-kafka-channel-to-mt-channel-based-broker-filter
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "broker-filter"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/knative-kafka-channel-data-plane" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-imc-to-mt-channel-based-broker-filter
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "broker-filter"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/imc-dispatcher" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-probe-kafka-broker-receiver
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-broker-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/kafka-controller" ]
      to:
        - operation:
            methods: [ "GET" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-probe-kafka-sink-receiver
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-sink-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/kafka-controller" ]
      to:
        - operation:
            methods: [ "GET" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-probe-kafka-channel-receiver
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-channel-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/kafka-controller" ]
      to:
        - operation:
            methods: [ "GET" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-traffic-to-activator
  namespace: knative-serving
spec:
  selector:
    matchLabels:
      app: activator
  action: ALLOW
  rules:
    - from:
        - source:
            namespaces: [ "knative-serving", "istio-system" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-traffic-to-autoscaler
  namespace: knative-serving
spec:
  selector:
    matchLabels:
      app: autoscaler
  action: ALLOW
  rules:
    - from:
        - source:
            namespaces: [ "knative-serving" ]

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: deny-all-by-default
  namespace: knative-eventing
spec: { }
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: deny-all-by-default
  namespace: knative-serving
spec: { }
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-mt-channel-based-broker-ingress-to-imc-dispatcher
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "imc-dispatcher"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/mt-broker-ingress" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-mt-channel-based-broker-ingress-to-kafka-channel
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-channel-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/mt-broker-ingress" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-kafka-channel-to-mt-channel-based-broker-filter
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "broker-filter"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/knative-kafka-channel-data-plane" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-imc-to-mt-channel-based-broker-filter
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "broker-filter"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/imc-dispatcher" ]
      to:
        - operation:
            methods: [ "POST" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-probe-kafka-broker-receiver
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-broker-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/kafka-controller" ]
      to:
        - operation:
            methods: [ "GET" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-probe-kafka-sink-receiver
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-sink-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/kafka-controller" ]
      to:
        - operation:
            methods: [ "GET" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-probe-kafka-channel-receiver
  namespace: knative-eventing
spec:
  action: ALLOW
  selector:
    matchLabels:
      app.kubernetes.io/component: "kafka-channel-receiver"
  rules:
    - from:
        - source:
            namespaces: [ "knative-eventing" ]
            principals: [ "cluster.local/ns/knative-eventing/sa/kafka-controller" ]
      to:
        - operation:
            methods: [ "GET" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-traffic-to-activator
  namespace: knative-serving
spec:
  selector:
    matchLabels:
      app: activator
  action: ALLOW
  rules:
    - from:
        - source:
            namespaces: [ "knative-serving", "istio-system" ]
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-traffic-to-autoscaler
  namespace: knative-serving
spec:
  selector:
    matchLabels:
      app: autoscaler
  action: ALLOW
  rules:
    - from:
        - source:
            namespaces: [ "knative-serving" ]

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这些策略限制 Serverless 系统组件之间网络通信的访问规则。具体来说，它们强制执行以下规则：

拒绝 knative-serving 和 knative-eventing 命名空间中未明确允许的所有流量
允许来自 istio-system 和 knative-serving 命名空间的流量来激活器
允许来自 knative-serving 命名空间的流量到自动扩展
允许 knative-eventing 命名空间中的 Apache Kafka 组件健康探测
允许 knative-eventing 命名空间中的基于频道的代理的内部流量

应用授权策略配置：

oc apply -f knative-default-authz-policies.yaml

$ oc apply -f knative-default-authz-policies.yaml

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定义哪些 OpenShift 项目可以相互通信。对于这个通信，一个租户的每个 OpenShift 项目都需要以下内容：

一个 AuthorizationPolicy 对象将传入的流量直接限制到租户的项目
一个 AuthorizationPolicy 对象使用在 knative-serving 项目中运行的 Serverless 的 activator 组件限制传入的流量
一个 AuthorizationPolicy 对象，允许 Kubernetes 在 Knative Services 上调用 PreStopHooks

安装 helm 工具并为每个租户创建所需资源，而不是手动创建这些策略：

安装 helm 工具

helm repo add openshift-helm-charts https://charts.openshift.io/

$ helm repo add openshift-helm-charts https://charts.openshift.io/

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为 团队 alpha创建示例配置

helm template openshift-helm-charts/redhat-knative-istio-authz --version 1.34.0 --set "name=team-alpha" --set "namespaces={team-alpha-1,team-alpha-2}" > team-alpha.yaml

$ helm template openshift-helm-charts/redhat-knative-istio-authz --version 1.34.0 --set "name=team-alpha" --set "namespaces={team-alpha-1,team-alpha-2}" > team-alpha.yaml

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为 团队 bravo创建示例配置

helm template openshift-helm-charts/redhat-knative-istio-authz --version 1.31.0 --set "name=team-bravo" --set "namespaces={team-bravo-1,team-bravo-2}" > team-bravo.yaml

$ helm template openshift-helm-charts/redhat-knative-istio-authz --version 1.31.0 --set "name=team-bravo" --set "namespaces={team-bravo-1,team-bravo-2}" > team-bravo.yaml

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应用授权策略配置：

oc apply -f team-alpha.yaml team-bravo.yaml

$ oc apply -f team-alpha.yaml team-bravo.yaml

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2.3. 保护 Service Mesh

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