New-AzPolicyDefinition Creation of Azure policy definition through PowerShell

Question

I am trying to create a Azure policy definition but getting error. This JSON code is taken from a built-in script from Azure policy "IP Forwarding on your virtual machine should be disabled" Below is my script

$Policy=
'{
  "properties": {
    "displayName": "Disable-IP-Forwarding",
    "policyType": "Custom",
    "mode": "All",
    "description": "Disable-IP-Forwarding-Test.",
    "metadata": {
      "version": "1.0.1",
      "category": "Security Center"
    },
    "parameters": {
      "effect": {
        "type": "String",
        "metadata": {
          "displayName": "Effect",
          "description": "Enable or disable the execution of the policy"
        },
        "allowedValues": [
          "AuditIfNotExists",
          "Disabled"
        ],
        "defaultValue": "AuditIfNotExists"
      }
    },
    "policyRule": {
      "if": {
        "field": "type",
        "in": [
          "Microsoft.Compute/virtualMachines",
          "Microsoft.ClassicCompute/virtualMachines"
        ]
      },
      "then": {
        "effect": "[parameters('effect')]",
        "details": {
          "type": "Microsoft.Security/complianceResults",
          "name": "disableIPForwarding",
          "existenceCondition": {
            "field": "Microsoft.Security/complianceResults/resourceStatus",
            "in": [
              "Monitored",
              "OffByPolicy",
              "Healthy"
            ]
          }
        }
      }
    }
  },
  "id": "/providers/Microsoft.Authorization/policyDefinitions/Disable-IP-Forwarding",
  "type": "Microsoft.Authorization/policyDefinitions",
  "name": "Disable-IP-Forwarding"
}'

$definition = New-AzPolicyDefinition    -Name "Disable-IP-Forwarding"  -Description "Disable-IP-Forwarding-Test." -Policy $Policy

Below are the pictures from Powershell showing error. 1 & 2

https://i.stack.imgur.com/Ttj4w.png https://i.stack.imgur.com/K0JCv.png

I also tried with removing single quotes in policy rule as in here(click Here)

**Error: After removing Single quote **

New-AzPolicyDefinition: InvalidPolicyRule: Failed to parse policy rule: 'Could not find member 'properties' on object of type 'PolicyRuleDefinition'. Path 'properties'.'. CorrelationId: 7e754d56-2e8e-4323-8650-ae620bb60573 At line:70 char:15

• ... efinition = New-AzPolicyDefinition -Name "Disable-IP-Forwarding"...

•  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  • CategoryInfo: CloseError: (:) [New-AzPolicyDefinition], ErrorResponseMessageException
  • FullyQualifiedErrorId: Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzurePolicyDefinitionCmdlet

Answer 1

As per the documentation , When you create the Policy definition using New-AzPolicyDefinition PowerShell Command. Your policy definition should be in the below format:

{
    "parameters": {
      "effect": {
        "type": "String",
        "metadata": {
          "displayName": "Effect",
          "description": "Enable or disable the execution of the policy"
        },
        "allowedValues": [
          "AuditIfNotExists",
          "Disabled"
        ],
        "defaultValue": "AuditIfNotExists"
      }
    },
    "policyRule": {
      "if": {
        "field": "type",
        "in": [
          "Microsoft.Compute/virtualMachines",
          "Microsoft.ClassicCompute/virtualMachines"
        ]
      },
      "then": {
        "effect": "[parameters('effect')]",
        "details": {
          "type": "Microsoft.Security/complianceResults",
          "name": "disableIPForwarding",
          "existenceCondition": {
            "field": "Microsoft.Security/complianceResults/resourceStatus",
            "in": [
              "Monitored",
              "OffByPolicy",
              "Healthy"
            ]
          }
        }
      }
    }
}

You can pass the description, mode, metadata, display name as the parameters in the command.

Another problem, removing the single quotes and passing "[parameters(effect)]" , this will give you another error. So the best way to pass the policy definition is saving it in the json file and pass the path to the command.

$definition = New-AzPolicyDefinition    -Name "Disable-IP-Forwarding"  -Description "Disable-IP-Forwarding-Test." -Policy "D:\Learning\policy1.json"

Answer 2

I figured it out as per in below link, used a Here-String for the JSON body: [link] (powershell.org/2019/04/hear-hear-for-here-strings)