Add Istio authorization policy

[brettcurtis]

Summary by CodeRabbit

• New Features
  • Introduced a new Kubernetes manifest resource for an AuthorizationPolicy, enhancing security by defining access controls for the application.
  • Added a documentation entry for the kubernetes_manifest.gke_info_go resource, providing users with direct access to comprehensive resource information.

[coderabbitai]

Walkthrough

The changes introduce a new Kubernetes manifest resource, kubernetes_manifest.gke_info_go, which defines an AuthorizationPolicy for the gke-info-go application. This resource specifies access control rules, including allowed operations and source namespaces. Additionally, the documentation for the resource has been updated to include a reference link, enhancing the overall resource information available to users.

Changes

Files	Change Summary
deployments/regional/README.md	New entry for kubernetes_manifest.gke_info_go resource documentation link added.
deployments/regional/main.tf	New resource declaration for kubernetes_manifest.gke_info_go that specifies an AuthorizationPolicy.

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Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 26500ed and fc6b0fd.

Files selected for processing (2)

• deployments/regional/README.md (1 hunks)
• deployments/regional/main.tf (1 hunks)

Files skipped from review due to trivial changes (1)

• deployments/regional/README.md

Additional comments not posted (1)

deployments/regional/main.tf (1)

276-324: Ensure the AuthorizationPolicy is correctly defined and aligned with security best practices.

The addition of the kubernetes_manifest.gke_info_go resource is a significant step towards enhancing the security posture of the gke-info-go application by explicitly defining access controls. Here are some observations and suggestions:

1. Resource Definition:

   • The apiVersion and kind are correctly specified for an Istio AuthorizationPolicy.
   • The metadata section correctly identifies the resource within the Kubernetes namespace.

2. Policy Specification:

   • The action field is set to "ALLOW", which is appropriate for defining permissions rather than restrictions.
   • The rules are well-defined, specifying that only GET requests are allowed to specific endpoints. This is a good practice as it limits the potential for abuse by restricting the types of requests that can be made.

3. Source Namespace Restriction:

   • The policy restricts the source to the istio-ingress namespace. This is a prudent choice as it ensures that only traffic coming through the controlled ingress points is allowed, which enhances security.

4. Path Specificity:

   • The paths specified are limited to essential operational endpoints, which minimizes the exposure of sensitive endpoints. This is a good security practice.

5. Label Selector:

   • The selector uses matchLabels to apply the policy specifically to the gke-info-go app. This targeted approach helps in minimizing the scope of the policy to relevant resources only.

Recommendations:

• Documentation: Ensure that the documentation is updated to reflect these changes and to guide users on how to interact with the new security measures.
• Testing: It would be beneficial to include tests that verify the enforcement of this policy to ensure that it behaves as expected under various scenarios.

Overall, the configuration appears to be well-thought-out and aligns with best practices for Kubernetes security. However, continuous evaluation and adjustment of the policy based on observed traffic and threats are recommended to maintain a robust security posture.