Hey, we're the spinning-factory team, the folks behind Kloak.
Kloak runs as a Kubernetes controller. It swaps the secrets in your workloads for harmless placeholders we call kloaked secrets, then uses eBPF to substitute the real secrets back in at the last moment — right when your app makes a request to an allowed host.
Today, Kloak works with any app using OpenSSL 3.0–3.5 (statically or dynamically linked) or go-tls (Go 1.25 and 1.26). Support for more TLS libraries (GnuTLS, BoringSSL, and others) and additional Go versions is on the roadmap.
Kloak is open source under the AGPL, contributions are welcome! We are also happy to hear any feedback and answer any question for the HN community.
Secrets are detected before encryption in the user buffer but rewrites happen post encryption in the kernel buffer to be sent on the wire.
packets boundaries are not an issue because detection happen at the SSL write where we have the full secret in the buffer and its position so we can know at rewrite time that the secret is cross 2 packets and rewrite it in 2 separate operations. We also have to update the TLS session hash at the end to not corrupt the TLS frame.
This is fantastic! I need this. however, for my self-hosted home projects that are containerized but where I don't use Kubernetes, is there a way for me to use a version of Kloak that does the same eBPF magic on docker-compose or LXC/QEMU (Incus) stacks?
It's perfectly fine for you to say non-Kubernetes isn't either your focus or on your 90 day roadmap :)
Thank you! We appreciate your enthusiasm! :-)
From technology perspective nothing prevent kloak to do rewrite on any workload scheduler or even without a scheduler (native Linux). The main challenge is to find a flow to signal to kloak what to rewrite and how to inject kloaked secrets to the workload.
TBH supporting other technologies is not something we thought about but we can definitely consider if there is an ask for it from the community.
I think it is funny that it's sewer, because a sewer is also a underground way around things, which is a good description of the out of band solution here. So the name checks out.
It should work in cloud environments, We tested it on EKS and digital ocean cloud so far, and it works. The kloak controller is deployed as privileged daemonset that have access to the underlying host and can perform eBPF attachment operations on all the pods on that host.
Thank you!
Not really, the controller is not doing dataplane per-say, it only pushes eBPF programs to the kernel for the relevant apps/cgroups so that could be considered control-plane. The full data-plane run in eBPF.
packets boundaries are not an issue because detection happen at the SSL write where we have the full secret in the buffer and its position so we can know at rewrite time that the secret is cross 2 packets and rewrite it in 2 separate operations. We also have to update the TLS session hash at the end to not corrupt the TLS frame.
It's perfectly fine for you to say non-Kubernetes isn't either your focus or on your 90 day roadmap :)
https://discuss.linuxcontainers.org/t/how-to-best-ask-questi...
https://en.wikipedia.org/wiki/Cloaca_Maxima
The main thing I wonder is how well supported is it in cloud environements? AKS/EKS/etc?