Date : 05 juin 2020 à 10:30 — 15 min.
As application security engineers, we are always looking for new ways of securing our services and reducing their privileges to what they absolutely need. When it comes to networking, cutting egress to the world and reducing internal access on a per service basis have always been two of the top priorities. However, as cloud computing services and container-orchestration systems (like Kubernetes) spread, static IP based solutions are becoming obsolete. The goal of this paper is to show how a new generation of security tools based on eBPF could help solve this problem.
More specifically, this paper proposes a network access control solution based on eBPF, that performs process level network security monitoring and enforcement. Although multiple tools already leverage eBPF to monitor and enforce networking rules (such as Cilium in Kubernetes), most of them only apply those rules at the interface level. By introducing a more fine-grained solution, malicious network activity can be mapped back to specific processes. This drastically improves investigation efforts, refines enforcement accuracy to avoid unnecessary downtime, and paves the way to a faster incident response time.
Source code: https://github.com/Gui774ume/network-security-probe