openvas-scanner VS gatekeeper

OpenVAS - https://github.com/greenbone/openvas-scanner

OWASP Zap, OWASP Amass, OpenVAS Scanner

And OpenVAS and OpenSSH and OpenBSD and OpenNN and OpenAFS and on and on and on

We can create an automation pipeline to patch the server using Foreman or Red Hat Satellite and for scanning, we can use OpenVAS or Nessus to get the list of vulnerabilities.

OpenVAS

I don't recommend cheaping out on vuln scanning, but if you really can't get any money there's always OpenVAS. That will allow you to do credentialed scanning and track vulnerabilities in your environment. It's no real substitute for Tenable or similar, but it's better than nothing.

When the Gatekeeper validatingwebhook came up, I was really worried that'd be the issue! Regardless I'd recommend anyone who cares about their cluster not collapsing to change the gatekeeper webhook to only intercept resources you care about: https://github.com/open-policy-agent/gatekeeper/pull/1806

Kyverno adds an extra layer of security where only the allowed type of manifest is deployed onto kubernetes, otherwise, it will reject or we can set validationFailureAction to audit which only logs the policy violation message for reporting. Kubewarden and Gatekeeper are alternative tools available to enforce policies on Kubernetes CRD.

Now, we have the hardest part resolved and let's turn our attention to the OPA Gatekeeper. Gatekeeper uses the OPA Constraint Framework to describe and enforce policy. Right now there are mainly 3 parts we should pay attention:

They enable you to establish the policies and regulations that govern cluster deployments and applications. Using predefined policies, policy engines can dynamically modify or create configurations. Policy engines such as Gatekeeper and Kyverno can be leveraged to meet legal and compliance requirements while maintaining operational flexibility and development speed.

Setup policy around what resource requirements can be requested by an app per environment. OPA and gatekeeper or kyverno can help. Setup access control for who can create or modify apps.

OPA Gatekeeper is an open source, general purpose policy engine. OPA decouples policy decisions from other responsibilities of an application, like those commonly referred to as business logic. OPA works equally well making decisions for Kubernetes, Microservices, functional application authorization and more, thanks to its single unified policy language.