DENY-VMUnmanagedDiskPolicyAssignment.json

{
    "$schema": "https://schema.management.azure.com/schemas/2019-08-01/tenantDeploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "enforcementMode": {
            "type": "string",
            "allowedValues": [
                "Default",
                "DoNotEnforce"
            ],
            "defaultValue": "Default"
        },
        "nonComplianceMessagePlaceholder": {
            "type": "string",
            "defaultValue": "{enforcementMode}"
        }
    },
    "variables": {
        "policyDefinitions": {
            "denyVMUnmanagedDisk": "/providers/Microsoft.Authorization/policyDefinitions/06a78e20-9358-41c9-923c-fb736d382a4d"
        },
        "policyAssignmentNames": {
            "denyVMUnmanagedDisk": "Deny-UnmanagedDisk",
            "description": "Deny virtual machines that do not use managed disk. It checks the managed disk property on virtual machine OS Disk fields.",
            "displayName": "Deny virtual machines and virtual machine scale sets that do not use managed disk"
        },
        "nonComplianceMessage": {
            "message": "Virtual machines and virtual machine scales sets {enforcementMode} use a managed disk.",
            "Default": "must",
            "DoNotEnforce": "should"
        }
    },
    "resources": [
        {
            "type": "Microsoft.Authorization/policyAssignments",
            "apiVersion": "2022-06-01",
            "name": "[variables('policyAssignmentNames').denyVMUnmanagedDisk]",
            "properties": {
                "description": "[variables('policyAssignmentNames').description]",
                "displayName": "[variables('policyAssignmentNames').displayName]",
                "policyDefinitionId": "[variables('policyDefinitions').denyVMUnmanagedDisk]",
                "enforcementMode": "[parameters('enforcementMode')]",
                "nonComplianceMessages": [
                    {
                        "message": "[replace(variables('nonComplianceMessage').message, parameters('nonComplianceMessagePlaceholder'), variables('nonComplianceMessage')[parameters('enforcementMode')])]"
                    }
                ],
                "overrides":[
                    {
                        "kind": "policyEffect",
                        "value": "Deny"
                    }
                ]
            }
        }
    ],
    "outputs": {}
}