Rulestacks and Rules on Cloud NGFW for AWS

Table of Contents

Rulestacks and Rules on Cloud NGFW for AWS

Author local rulestacks when you're assigned the LocalRuleStackAdmin role.

Where Can I Use This?	What Do I Need?
Cloud NGFW for AWS	Cloud NGFW subscription Palo Alto Networks Customer Support Account (CSP) AWS Marketplace account User role (either tenant or administrator)

Rulestacks defines access control (App-ID, URL Filtering) and threat prevention behavior of Cloud NGFW resources. A Cloud NGFW resource uses your rulestack definitions to protect the traffic by a two-step process. First, it enforces your rules on the to allow or deny your traffic. Second, it performs content inspection on the allowed traffic based on what you specify on the Security Profiles. A rulestack includes a set of security rules, associated objects, and profiles similar to devices groups on Panorama. There are two types of rulestacks.

Local rulestack—A Local rulestack consists of local rules and manages the local rules. A local account administrator can associate a local rulestack to an NGFW in their AWS account. To create and manage local rulestacks, you must have the Local rulestack admin role.
Global rulestack—The AWS Firewall Manager administrator can author a Firewall Manager Service (FMS) policy and associate a Global rulestack with it. AWS Firewall Manager manages the Global rulestack across all these NGFWs in different AWS accounts of an AWS Organization. A Global rulestack configures pre-rules and post-rules on each NGFW. To create and manage global rulestacks, you must have the Global rulestack admin role.
- Pre-rules—Rules added to the top of the rule order. These rules are evaluated first.
- Post-rules—Rules added at the bottom of the rule order. These rules are evaluated after the pre-rules and rules defined in a local rulestack applied to an individual NGFW.

When using the AWS Firewall Manager, a combination of local and global rulestacks allows you to create a hierarchical rules model. The pre-rules of a global rulestacks can act as global default rules for all associated firewalls. Then you can use a local rulestack to define rules for specific applications or users. The post-rules can be used to allow or deny traffic that does not match any pre-rules or those rules defined in the local rulestack.

One global rulestack and one local rulestack are applied to each NGFW.

If you're using Multi-Account Tenant or Multi-VPC, consider the following changes to rulestack behavior:

when a rulestack is created, it's mapped to a specific account.
you can now associate a rulestack with a firewall resource in any onboarded account.
permissions are still mapped to the account associated with the rulestack; any modifications to the rulestack are done by a user with LRA permissions in the rulestacks account.

Certificates from any onboarded account are mapped to a rulestack. For example, the certificate in account1 and the certificate in account2 are mapped to a rulestack in account3, which could be associated with a firewall resource in account4. In this scenario, all accounts (1-4) must be successfully onboarded.

Create a Rulestack on Cloud NGFW for AWS

In the Cloud NGFW tenant, you can author rulestacks if you are you assigned the LocalRuleStackAdmin or GlobalRulestackAdmin role. To author a global rulestack, you must have used the AWS Firewall Manager to create your Cloud NGFW tenant.

When you create a local rulestack, you must specify an AWS account. Apply the rulestack to NGFWs associated with that AWS account only. Complete the following procedure to create a rulestack.

Select RulestacksCreate Rulestack.
Select Local Rulestack or Global Rulestack (FMS deployment only) from the drop-down.
Enter a descriptive Name for your rulestack.
(Optional) Enter a Description for your rulestack.
(Local rulestack only) Select an AWS Account from the drop-down.
(Optional) Apply Tags.
1. Click the
  
  icon and select Add New.
2. Enter a Key and Value.
3. Click Add.
(Optional) Enable X-Forwarded-For for Security Policy. See X-Forwarded For for more information.
Click Save.
After creating the rulestack, deploy it to the firewall.