Attach cloudarmor policies to load balancers

[beets]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @beets, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the security posture of our load-balanced services by attaching a specific Cloud Armor policy. The "botcrawl-throttle" policy is now configured to protect the backend services, aiming to mitigate unwanted bot traffic and improve overall system resilience against automated attacks. This change is implemented across both templated and direct Kubernetes configurations.

Highlights

• Cloud Armor Policy Integration: This pull request integrates a Cloud Armor security policy named "botcrawl-throttle" directly into the load balancer backend configurations.
• Configuration Updates: The securityPolicy field has been added to both the Helm chart template for single cluster deployments and the standalone BackendConfig resource, ensuring consistent application of the policy.

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[gemini-code-assist]

Code Review

This pull request adds a Cloud Armor security policy, botcrawl-throttle, to the backend configuration for the main website service. My review highlights two main points. First, the policy name is hardcoded in the Kubernetes manifests; I've suggested making this configurable, especially in the Helm chart, to improve maintainability. Second, the policy is only applied to one of several backends exposed by the load balancer. I've raised a question about whether other backends (Node.js, mixer) should also be protected by this policy to ensure complete coverage.

[gemini-code-assist]

I have a couple of points regarding this change:

• Hardcoded value: The security policy name botcrawl-throttle is hardcoded. In Helm charts, it's best practice to make such values configurable via values.yaml. This improves reusability and simplifies management across different environments. You could add a value like website.securityPolicyName to values.yaml and reference it here.
• Incomplete coverage?: This change adds the security policy only to the main website-service's BackendConfig. However, backendconfig-nodejs and website-mixer-backendconfig are also defined in this chart and exposed via the same Ingress. Should they also be protected by this Cloud Armor policy? If so, the securityPolicy block should be added to them as well.

  securityPolicy:
    name: {{ .Values.website.securityPolicyName }}

[gmechali]

Should we do this?

[gemini-code-assist]

I have a couple of points regarding this change:

• Hardcoded value: The security policy name botcrawl-throttle is hardcoded. If you are using a tool like Kustomize, it would be better to manage this value as a variable to improve maintainability. If not, a comment indicating this might need manual changes could be helpful.
• Incomplete coverage?: The security policy is applied to the main service's backendconfig, but not to backendconfig-nodejs in the same file. Should the Node.js backend also be protected? If so, the securityPolicy should be added there too.