aca-allowed-ingress-target-ports.json

{
  "properties": {
    "displayName": "Azure Container Apps allowed ingress target ports",
    "policyType": "Custom",
    "mode": "Indexed",
    "description": "This policy enables you to restrict the list of ingress target ports for Azure Container Apps.",
    "metadata": {
      "version": "1.0.0",
      "category": "Azure Container Apps"
    },
    "parameters": {
      "listOfAllowedIngressTargetPorts": {
        "type": "Array",
        "metadata": {
          "displayName": "Allowed container ports",
          "description": "The list of container ports that can be specified when deploying resources."
        },
        "defaultValue": [
          80,
          443
        ]
      },
      "effect": {
        "type": "String",
        "metadata": {
          "displayName": "Effect",
          "description": "Enable or disable the execution of the policy"
        },
        "allowedValues": [
          "Audit",
          "Deny",
          "Disabled"
        ],
        "defaultValue": "Audit"
      }
    },
    "policyRule": {
      "if": {
        "allOf": [{
            "field": "type",
            "equals": "Microsoft.App/containerApps"
          },
          {
            "field": "Microsoft.App/containerApps/configuration.ingress",
            "exists": true
          },
          {
            "not": {
              "field": "Microsoft.App/containerApps/configuration.ingress",
              "equals": ""
            }
          },
          {
            "field": "Microsoft.App/containerApps/configuration.ingress.targetPort",
            "notIn": "[parameters('listOfAllowedIngressTargetPorts')]"
          }
        ]
      },
      "then": {
        "effect": "[parameters('effect')]"
      }
    }
  }
}