《OpenShift 4.x HOL教程汇总》
本文在 OpenShift4.9 + RAHACS 环境中进行验证。

创建 RHACS 的 Policy

创建一个 Policy 的 JSON 文件，内容如下。Policy 只针对 OpenShift 的 Production 项目中的资源识别容器是否运行 curl 命令，一旦发现有 curl 命令运行，立即终止 Pod 运行。

{
    "policies": [
        {
            "id": "e0a224d9-ca08-48c7-8164-7325245257d8",
            "name": "有 Curl 运行",
            "description": "在容器中运行了 Curl 命令",
            "rationale": "Curl 有可能下载能具有风险的文件",
            "remediation": "可以删除镜像中的 Curl 以便提升安全性",
            "disabled": false,
            "categories": [
                "Security Best Practices"
            ],
            "fields": null,
            "lifecycleStages": [
                "RUNTIME"
            ],
            "eventSource": "DEPLOYMENT_EVENT",
            "whitelists": [],
            "exclusions": [],
            "scope": [
                {
                    "cluster": "",
                    "namespace": "production",
                    "label": null
                }
            ],
            "severity": "LOW_SEVERITY",
            "enforcementActions": [
                "KILL_POD_ENFORCEMENT",
                "FAIL_KUBE_REQUEST_ENFORCEMENT"
            ],
            "notifiers": [],
            "lastUpdated": "2022-01-15T10:30:09.564919243Z",
            "SORTName": "",
            "SORTLifecycleStage": "",
            "SORTEnforcement": false,
            "policyVersion": "1.1",
            "policySections": [
                {
                    "sectionName": "Policy Section 1",
                    "policyGroups": [
                        {
                            "fieldName": "Process Name",
                            "booleanOperator": "OR",
                            "negate": false,
                            "values": [
                                {
                                    "value": "curl"
                                }
                            ]
                        }
                    ]
                }
            ],
            "mitreAttackVectors": [],
            "criteriaLocked": false,
            "mitreVectorsLocked": false,
            "isDefault": false
        }
    ]
}

在 RHACS 控制台中进入 Platform Configuration 的 System Policies，然后通过 “Import a policy” 图标将以下 JSON 内容导入到 RHACS。

部署测试应用

在 OpenShift 中创建 development 和 production 项目。

oc new-project development
oc new-project production

分别在 development 和 production 项目中部署 “registry.access.redhat.com/rhscl/httpd-24-rhel7” 镜像。

oc new-app --image=registry.access.redhat.com/rhscl/httpd-24-rhel7 --name=httpd-development -n development
oc new-app --image=registry.access.redhat.com/rhscl/httpd-24-rhel7 --name=httpd-production -n production

验证

先在 development 项目中的 Pod 运行 curl 命令，确认可以正常运行。

$ oc project development
$ oc exec deploy/httpd-development -- curl http://www.baidu.com -o /dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2381  100  2381    0     0   7369      0 --:--:-- --:--:-- --:--:--  7394

然后在 production 项目中的 Pod 运行 curl 命令，确认最后会提示 “command terminated with exit code 143”。

$ oc project production
$ oc exec deploy/httpd-production -- curl http://www.baidu.com -o /dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0command terminated with exit code 143

查看 httpd-production 部署的 Event，确认有提示 Pod 因违反 ““有 Curl 运行”” 的策略被 killed。

$ oc describe deploy httpd-production -n production
。。。
Events:
  Type     Reason                Age    From                   Message
  ----     ------                ----   ----                   -------
  Normal   ScalingReplicaSet     140m   deployment-controller  Scaled up replica set httpd-production-6fbdfc6465 to 1
  Warning  StackRox enforcement  122m   stackrox/sensor        A pod (httpd-production-6fbdfc6465-9gnpq) violated StackRox policy "有 Curl 运行" and was killed