deny_nic_public_ip.json

{
  "type": "Microsoft.Authorization/policyDefinitions",
  "name": "deny_nic_public_ip",
  "properties": {
    "metadata": {
      "category": "Network"
    },
    "parameters": {
      "effect": {
        "type": "String",
        "defaultValue": "Deny",
        "allowedValues": [
          "Audit",
          "Deny",
          "Disabled"
        ],
        "metadata": {
          "displayName": "Effect",
          "description": "The effect determines what happens when the policy rule is evaluated to match"
        }
      }
    },
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Network/networkInterfaces"
          },
          {
            "not": {
              "field": "Microsoft.Network/networkInterfaces/ipconfigurations[*].publicIpAddress.id",
              "notLike": "*"
            }
          }
        ]
      },
      "then": {
        "effect": "[parameters('effect')]"
      }
    }
  }
}