last sync: 2021-Jul-23 16:37:57 UTC

Azure Policy definition

Kubernetes cluster pods should only use approved host network and port range

Name Kubernetes cluster pods should only use approved host network and port range
Azure Portal
Id 82985f06-dc18-4a48-bc1c-b9f4f0098cfe
Version 3.0.0
details on versioning
Category Kubernetes
Microsoft docs
Description Restrict pod access to the host network and the allowable host port range in a Kubernetes cluster. This recommendation is part of CIS 5.2.4 which is intended to improve the security of your Kubernetes environments. This policy is generally available for Kubernetes Service (AKS), and preview for AKS Engine and Azure Arc enabled Kubernetes. For more information, see https://aka.ms/kubepolicydoc.
Mode Microsoft.Kubernetes.Data
Type BuiltIn
Preview FALSE
Deprecated FALSE
Effect Default: audit
Allowed: (audit, deny, disabled)
Used RBAC Role none
History
Date/Time (UTC ymd) (i) Change type Change detail
2021-03-02 15:11:40 change Major (2.0.1 > 3.0.0)
2020-12-11 15:42:52 change Major (1.0.1 > 2.0.1)
2020-09-15 14:06:41 change Previous DisplayName: [Preview]: Kubernetes cluster pods should only use approved host network and port range
2020-07-08 14:28:08 add 82985f06-dc18-4a48-bc1c-b9f4f0098cfe
Used in Initiatives
Initiative DisplayName Initiative Id Initiative Category State
[Deprecated]: Azure Security Benchmark v2 bb522ac1-bc39-4957-b194-429bcd3bcb0b Regulatory Compliance Deprecated
[Preview]: CMMC Level 3 b5629c75-5c77-4422-87b9-2509e680f8de Regulatory Compliance Preview
[Preview]: NIST SP 800-53 Rev. 5 179d1daa-458f-4e47-8086-2a68d0d6c38f Regulatory Compliance Preview
Azure Security Benchmark 1f3afdf9-d0c9-4c3d-847f-89da613e70a8 Security Center GA
FedRAMP High d5264498-16f4-418a-b659-fa7ef418175f Regulatory Compliance GA
FedRAMP Moderate e95f5a9f-57ad-4d03-bb0b-b1d16db93693 Regulatory Compliance GA
Kubernetes cluster pod security baseline standards for Linux-based workloads a8640138-9b0a-4a28-b8cb-1666c838647d Kubernetes GA
Kubernetes cluster pod security restricted standards for Linux-based workloads 42b8ef37-b724-4e24-bbc8-7a7708edfe00 Kubernetes GA
NIST SP 800-53 Rev. 4 cf25b9c1-bd23-4eb6-bd2c-f4f3ac644a5f Regulatory Compliance GA
JSON Changes

JSON
{
  "properties": {
    "displayName": "Kubernetes cluster pods should only use approved host network and port range",
    "policyType": "BuiltIn",
    "mode": "Microsoft.Kubernetes.Data",
    "description": "Restrict pod access to the host network and the allowable host port range in a Kubernetes cluster. This recommendation is part of CIS 5.2.4 which is intended to improve the security of your Kubernetes environments. This policy is generally available for Kubernetes Service (AKS), and preview for AKS Engine and Azure Arc enabled Kubernetes. For more information, see https://aka.ms/kubepolicydoc.",
    "metadata": {
      "version": "3.0.0",
      "category": "Kubernetes"
    },
    "parameters": {
      "effect": {
        "type": "String",
        "metadata": {
          "displayName": "Effect",
          "description": "'Audit' allows a non-compliant resource to be created or updated, but flags it as non-compliant. 'Deny' blocks the non-compliant resource creation or update. 'Disabled' turns off the policy."
        },
        "allowedValues": [
          "audit",
          "deny",
          "disabled"
        ],
        "defaultValue": "audit"
      },
      "excludedNamespaces": {
        "type": "Array",
        "metadata": {
          "displayName": "Namespace exclusions",
          "description": "List of Kubernetes namespaces to exclude from policy evaluation."
        },
        "defaultValue": [
          "kube-system",
          "gatekeeper-system",
          "azure-arc"
        ]
      },
      "namespaces": {
        "type": "Array",
        "metadata": {
          "displayName": "Namespace inclusions",
          "description": "List of Kubernetes namespaces to only include in policy evaluation. An empty list means the policy is applied to all resources in all namespaces."
        },
        "defaultValue": [
          
        ]
      },
      "labelSelector": {
        "type": "Object",
        "metadata": {
          "displayName": "Kubernetes label selector",
          "description": "Label query to select Kubernetes resources for policy evaluation. An empty label selector matches all Kubernetes resources."
        },
        "defaultValue": {
          
        }
      },
      "allowHostNetwork": {
        "type": "Boolean",
        "metadata": {
          "displayName": "Allow host network usage",
          "description": "Set this value to true if pod is allowed to use host network otherwise false."
        },
        "defaultValue": false
      },
      "minPort": {
        "type": "Integer",
        "metadata": {
          "displayName": "Min host port",
          "description": "The minimum value in the allowable host port range that pods can use in the host network namespace."
        },
        "defaultValue": 0
      },
      "maxPort": {
        "type": "Integer",
        "metadata": {
          "displayName": "Max host port",
          "description": "The maximum value in the allowable host port range that pods can use in the host network namespace."
        },
        "defaultValue": 0
      }
    },
    "policyRule": {
      "if": {
        "field": "type",
        "in": [
          "AKS Engine",
          "Microsoft.Kubernetes/connectedClusters",
          "Microsoft.ContainerService/managedClusters"
        ]
      },
      "then": {
      "effect": "[parameters('effect')]",
        "details": {
          "constraintTemplate": "https://store.policy.core.windows.net/kubernetes/host-network-ports/v1/template.yaml",
          "constraint": "https://store.policy.core.windows.net/kubernetes/host-network-ports/v1/constraint.yaml",
        "excludedNamespaces": "[parameters('excludedNamespaces')]",
        "namespaces": "[parameters('namespaces')]",
        "labelSelector": "[parameters('labelSelector')]",
          "values": {
          "allowHostNetwork": "[parameters('allowHostNetwork')]",
          "minPort": "[parameters('minPort')]",
          "maxPort": "[parameters('maxPort')]"
          }
        }
      }
    }
  },
  "id": "/providers/Microsoft.Authorization/policyDefinitions/82985f06-dc18-4a48-bc1c-b9f4f0098cfe",
  "type": "Microsoft.Authorization/policyDefinitions",
  "name": "82985f06-dc18-4a48-bc1c-b9f4f0098cfe"
}