Support Default Disabled Rules in AppGW WAF Manifest with ComputedDisabledRules Property

[yoavmal]

NOTE:

This was already reviewed and approved here: PR. Since release-network-2024-10-01 isn't considered for main yet, I cherry-picked the feature into main.

Description

Default Disabled Rules

The Default Disabled Rules feature allows certain rules in a managed rule group to be disabled by default. This is different from the previous behavior, where all rules were automatically enabled unless the user explicitly disabled them.

With this feature, rule authors (i.e., us - AppGW WAF team) can mark specific rules as disabled in the manifest. Users can then override this default disabled rules by explicitly enabling those rules in their WAF policy. The user's override always takes priority—if a user enables a rule that’s disabled by default, the rule becomes enabled.

As part of this feature, a new read-only property called ComputedDisabledRules was introduced. This property shows the final list of rules that are effectively disabled, based on:

• The default state of each rule in the managed ruleset.
• The user’s overrides, which can enable or disable specific rules.

This property makes it easier to understand which rules are effectively disabled.

Design Document:
https://microsoftapc-my.sharepoint.com/:w:/r/personal/neerajsingh_microsoft_com/_layouts/15/Doc.aspx?sourcedoc=%7B5449A54B-248C-41BD-8D4B-2EE3BB64E302%7D&file=Default%20disabled%20rules%20design%20document.docx&action=default&mobileredirect=true

Minimum API Version Required

2024-07-01

Swagger PR link / SDK link

Main - https://github.com/Azure/azure-rest-api-specs-pr/pull/19894
Minor - property naming fix - https://github.com/Azure/azure-rest-api-specs-pr/pull/20162

Request Examples

https://github.com/Azure/azure-rest-api-specs-pr/blob/main/specification/network/resource-manager/Microsoft.Network/stable/2024-07-01/examples/ApplicationGatewayAvailableWafRuleSetsGet.json

https://github.com/Azure/azure-rest-api-specs-pr/blob/main/specification/network/resource-manager/Microsoft.Network/stable/2024-07-01/examples/WafListAllPolicies.json

https://github.com/Azure/azure-rest-api-specs-pr/blob/main/specification/network/resource-manager/Microsoft.Network/stable/2024-07-01/examples/WafListPolicies.json

https://github.com/Azure/azure-rest-api-specs-pr/blob/main/specification/network/resource-manager/Microsoft.Network/stable/2024-07-01/examples/WafPolicyGet.json

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

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[Copilot]

Pull Request Overview

This PR implements support for default disabled rules in Application Gateway WAF (Web Application Firewall) policies by introducing a new read-only property ComputedDisabledRules. The feature allows WAF rule authors to set rules as disabled by default in the manifest, while users can still override these defaults.

Key changes include:

• Added a new ComputedDisabledRules property that shows the effective state of disabled rules
• Implemented AutoMapper configuration for the new model classes
• Added comprehensive test coverage for the computed disabled rules functionality

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
PSApplicationGatewayFirewallPolicyManagedRuleSetRuleGroup.cs	New model class for representing rule groups with disabled rules
PSApplicationGatewayFirewallPolicyManagedRuleSet.cs	Added ComputedDisabledRules property to existing managed rule set model
NetworkResourceManagerProfile.cs	Added AutoMapper configuration for the new model class
ChangeLog.md	Documented the new ComputedDisabledRules property and affected cmdlets
ApplicationGatewayTests.ps1	Added comprehensive test function for the new functionality
ApplicationGatewayTests.cs	Updated test runner to execute the new test

Comments suppressed due to low confidence (1)

src/Network/Network.Test/ScenarioTests/ApplicationGatewayTests.cs:379

• The test method name was changed from TestApplicationGatewayFirewallPolicyWithCustomBlockResponse to TestApplicationGatewayFirewallPolicyComputedDisabledRules, but this appears to be replacing an existing test rather than adding a new one. The original custom block response test coverage may have been lost.

        public void TestApplicationGatewayFirewallPolicyComputedDisabledRules()

[Copilot]

The setter for ComputedDisabledRules is private, but there's no public method to populate this property. Consider adding a public setter or an initialization method to ensure the property can be properly populated during object creation and mapping operations.

Suggested change

	public List<PSApplicationGatewayFirewallPolicyManagedRuleSetRuleGroup> ComputedDisabledRules { get; private set; }
	public List<PSApplicationGatewayFirewallPolicyManagedRuleSetRuleGroup> ComputedDisabledRules { get; set; }

[NoriZC]

/azp run

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