在 istio-proxy 和出口网关之间使用自定义 mTLS 为出口流量发起 mTLS

mTLS origination for egress traffic with custom mTLS between istio-proxy and egress gateway

我们的安全部门对出口流量的要求非常严格:POD 内的每个应用程序都必须使用应用程序的专用证书通过一些具有 mTLS 身份验证的代理(应用程序代理)。他们建议使用带隧道的 squid 来处理双重 mTLS(一个用于代理,另一个用于特定流量应用程序服务器),但随后我们强制该应用程序支持 ssl。 Istio 可以进来完成这项工作,但使用开箱即用的 ISTIO_MUTUAL 模式(在 istio-proxy 和出口网关之间)对我们来说不是这样。

因此,我尝试使用示例 Configure mutual TLS origination for egress traffic 对其进行如下修改(更改标记为 #- 和 #+):

apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: istio-egressgateway
spec:
  selector:
    istio: egressgateway
  servers:
  - port:
      number: 443
      name: https
      protocol: HTTPS
    hosts:
    - my-nginx.mesh-external.svc.cluster.local
    tls:
      #mode: ISTIO_MUTUAL #-
      mode: MUTUAL #+
      credentialName: egress-gateway-credential #+
---
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: egressgateway-for-nginx
spec:
  host: istio-egressgateway.istio-system.svc.cluster.local
  subsets:
  - name: nginx
    trafficPolicy:
      loadBalancer:
        simple: ROUND_ROBIN
      portLevelSettings:
      - port:
          number: 443
        tls:
          #mode: ISTIO_MUTUAL #-
          mode: MUTUAL #+
          credentialName: egress-app-credential #+
          sni: my-nginx.mesh-external.svc.cluster.local

创建秘密的位置:

kubectl create -n istio-system secret generic egress-app-credential \
--from-file=tls.key=client.app.key \
--from-file=tls.crt=client.app.crt \
--from-file=ca.crt=some-root.crt


kubectl create -n istio-system secret generic egress-gateway-credential \
--from-file=tls.key=egress.key \
--from-file=tls.crt=egress.crt \
--from-file=ca.crt=some-root.crt

我认为这在逻辑上是正确的,但可能不是因为我收到错误:

kubectl exec "$(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name})" -c sleep -- curl -vsS http://my-nginx.mesh-external.svc.cluster.local

*   Trying 10.98.10.231:80...
* Connected to my-nginx.mesh-external.svc.cluster.local (10.98.10.231) port 80 (#0)
> GET / HTTP/1.1
> Host: my-nginx.mesh-external.svc.cluster.local
> User-Agent: curl/7.77.0-DEV
> Accept: */*
> 
upstream connect error or disconnect/reset before headers. reset reason: connection termination* Mark bundle as not supporting multiuse
< HTTP/1.1 503 Service Unavailable
< content-length: 95
< content-type: text/plain
< date: Mon, 07 Jun 2021 11:01:08 GMT
< server: envoy
< 
{ [95 bytes data]
* Connection #0 to host my-nginx.mesh-external.svc.cluster.local left intact

附加信息(上述请求的 istio-egressgateway 日志):

  1. ISTIO_MUTUAL(示例 - 标准 istio 代码)

客户端 pod 日志:

istio-proxy [2021-06-08T09:18:02.777Z] "GET / HTTP/1.1" 200 - via_upstream - "-" 0 612 2 1 "-" "curl/7.77.0-DEV" "148be8db-5675-40eb-a246-26f51a5c73d2" "my-nginx.mesh-external.svc.cluste │
│ r.local" "172.17.0.7:8443" outbound|443|nginx|istio-egressgateway.istio-system.svc.cluster.local 172.17.0.5:37858 10.111.175.215:80 172.17.0.5:50610 - -

出口 pod 日志:

[2021-06-07T11:20:52.907Z] "GET / HTTP/1.1" 200 - via_upstream - "-" 0 612 2 1 "172.17.0.5" "curl/7.77.0-DEV" "f163fbb1-8c9d-4960-9814-fc7bf11549ff" "my-nginx.mesh-external.svc.c 
  1. 自定义 MUTUAL 设置(IP:172.17.0.8 是 istio-egress POD):

客户端 pod 日志:

[2021-06-07T12:02:20.626Z] "GET / HTTP/1.1" 503 UC upstream_reset_before_response_started{connection_termination} - "-" 0 95 1 - "-" "curl/7.77.0-DEV" "5fb31226-21fd-4c10-882c-f72bed3483e7" "my-nginx.mesh-external.svc.cluster.local" "172.17.0.8:8443" outbound|443|nginx|istio-egressgateway.istio-system.svc.cluster.local 172.17.0.5:49588 10.98.10.231:80 172.17.0.5:41028 - -

出口 pod 日志:

[2021-06-07T11:20:38.018Z] "- - -" 0 NR filter_chain_not_found - "-" 0 0 0 - "-" "-" "-" "-" "-" - - 172.17.0.8:8443 172.17.0.5:44558 - -                                         

任何帮助都是有价值的,因为我自己也在努力解决这个问题,也许我在某个地方犯了逻辑错误。

已编辑: 至于8443端口号:

istioctl x describe pod istio-egressgateway-79fcc9c54b-bnbzm -n istio-system                                                          
Pod: istio-egressgateway-79fcc9c54b-bnbzm
   Pod Ports: 8080 (istio-proxy), 8443 (istio-proxy), 15090 (istio-proxy)
Suggestion: add 'version' label to pod for Istio telemetry.
--------------------
Service: istio-egressgateway
   Port: http2 80/HTTP2 targets pod port 8080
   Port: https 443/HTTPS targets pod port 8443

测试于:

好的,我终于解决了。这里的关键点是 DestinationRule 规范的一部分,它说:

  • credentialName -> 注意:此字段目前仅适用于网关。 Sidecars 将继续使用证书路径。

所以我修改了以下清单:

sleep.yml 的客户端部署(安装证书)

kind: Deployment
metadata:
  name: sleep
 # putting it here does not work 
 # annotations:                                                                                       
 #   sidecar.istio.io/userVolumeMount: '[{"name":"app-certs", "mountPath":"/etc/istio/egress-app-credential", "readonly":true}]'
 #   sidecar.istio.io/userVolume: '[{"name":"app-certs", "secret":{"secretName":"egress-app-credential"}}]'
spec:
  replicas: 1
  selector:
    matchLabels:
      app: sleep
  template:
    metadata:
      annotations: #+                                                                                      
        sidecar.istio.io/userVolumeMount: '[{"name":"app-certs", "mountPath":"/etc/istio/egress-app-credential", "readonly":true}]' #+
        sidecar.istio.io/userVolume: '[{"name":"app-certs", "secret":{"secretName":"egress-app-credential"}}]' #+
      labels:
        app: sleep
...

egressgateway-for-nginx DR:

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: egressgateway-for-nginx
spec:
  host: istio-egressgateway.istio-system.svc.cluster.local
  subsets:
  - name: nginx
    trafficPolicy:
      loadBalancer:
        simple: ROUND_ROBIN
      portLevelSettings:
      - port:
          number: 443
        tls:
          # mode: ISTIO_MUTUAL #-
          mode: MUTUAL #+
          clientCertificate: /etc/istio/egress-app-credential/tls.crt #+
          privateKey: /etc/istio/egress-app-credential/tls.key #+
          caCertificates: /etc/istio/egress-app-credential/ca.crt #+
          sni: my-nginx.mesh-external.svc.cluster.local   

现在所有证书都已正确部署在我的客户端 POD 上:

istioctl proxy-config secret "$(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name})"
RESOURCE NAME                                                                                   TYPE           STATUS     VALID CERT     SERIAL NUMBER                                        NOT AFTER                NOT BEFORE
file-cert:/etc/istio/egress-app-credential/tls.crt~/etc/istio/egress-app-credential/tls.key     Cert Chain     ACTIVE     true           1                                                    2022-05-06T09:19:24Z     2021-05-06T09:19:24Z
default                                                                                         Cert Chain     ACTIVE     true           200416862686144849012679224886550934182              2021-06-10T07:41:17Z     2021-06-09T07:41:17Z
file-root:/etc/istio/egress-app-credential/ca.crt                                               CA             ACTIVE     true           422042020503057064387036627903001284930102376872     2022-05-06T08:07:57Z     2021-05-06T08:07:57Z
ROOTCA                                                                                          CA             ACTIVE     true           11126135119553711053963756442081214010               2031-06-06T07:45:55Z     2021-06-08T07:45:55Z

使用

对其进行测试
kubectl exec "$(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name})" -c sleep -- curl -sS http://my-nginx.mesh-external.svc.cluster.local

给出了预期的结果。