Feat/153 network policy expansion accross namespaces

[benie-joy-possi]

Expand namespace isolation with explicit network policy coverage.

[github-actions]

The pull request Feat/153 network policy expansion accross namespaces introduces extensive NetworkPolicy coverage across multiple namespaces in the Helm charts.

Key Observations:

• Purpose: Enforces stronger network isolation by implementing default-deny-like structures and explicit allowed ingress/egress rules across various components (cert, core-gateway, librechart, mcps).
• Structure: The implementation uses Helm if blocks to conditionally enable these policies based on .Values.networkPolicy.enabled or specific keys in .Values.policies. This allows for flexible adoption.
• Granularity: Policies are well-defined with specific namespaceSelector and podSelector criteria, adhering to principles of least privilege.
• Egress Control: Egress is strictly controlled, generally allowing DNS (kube-system), intra-namespace traffic, and specific dependencies (like API servers or other services).
• Changes:
  • Adds several new networkpolicy.yaml templates across charts.
  • Updates values.yaml files to support these new configurations.
  • Refactors models-proxy by removing an existing policy template and integrating it into the new structure via values.yaml updates.

Potential Considerations:

1. Default Deny: Ensure that enabling these policies does not break existing traffic flows if not all required communication paths are accounted for in the ingress/egress rules.
2. Naming Consistency: The naming conventions for network policies seem consistent across the added files.
3. Complexity: The core-gateway/templates/networkpolicy.yaml file is quite large (500+ lines) due to containing multiple policy definitions. While functional, it might be beneficial to consider splitting these into smaller, modular files if maintenance becomes difficult.

Overall, this is a significant enhancement to the security posture of the infrastructure. The implementation appears systematic and follows Kubernetes best practices for network isolation.

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