Building a Lightning Fast Firewall with Java & eBPF (JavaZone 2024)

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Building a Lightning Fast Firewall in Java & eBPF Mohammed Aboullaite @laytoun Sr Backend Engineer, Spotify Java Champion Google Developer Expert Johannes Bechberger mostlynerdless.de OpenJDK Developer, SAP Creator of hello-ebpf

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We have a simple web application

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We have a simple web application DDoS Attack

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The naïve way?

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Drop packets in your application

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Any Problems?

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Sockets https://mostlynerdless.de/blog/2024/08/13/hello-ebpf-a-packet-logger-in-pure-java-using-tc-and-xdp-hooks-13/

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Alternative: Use a Firewall

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How to improve it?

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https://blog.cloudflare.com/how-to-drop-10-million-packets/

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Become a 10x Firewall

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vs https://blog.cloudflare.com/how-to-drop-10-million-packets/

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Sockets Allocations XDP

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https://blog.cloudflare.com/how-to-drop-10-million-packets/ vs even faster with offloading

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Option 1: Change Kernel Traditional ways Option 2: Kernel Module

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Greg Kroah-Hartman “ https://www.kernel.org/doc/html/latest/process/stable-api-nonsense.html https://www.youtube.com/watch?v=agC5N9I6jRE You think you want a stable kernel interface, but you really do not, and you don’t even know it.

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Option 1: Change Kernel Traditional ways Option 2: Kernel Module

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Can we do better?

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eBPF is a crazy technology, it’s like putting JavaScript into the Linux kernel Brendan Gregg “ https://www.youtube.com/watch?v=tDacjrSCeq4

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https://www.facesofopensource.com/brendan-gregg/ eBPF is a crazy technology, it’s like putting JavaScript into the Linux kernel “ Brendan Gregg

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eBPF is making the Linux Kernel programmable at native execution speed!

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eBPF runtime

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eBPF runtime Safety and Security Efﬁciency Continuous delivery Standard

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How to share data? https://mostlynerdless.de/blog/2024/01/12/hello-ebpf-recording-data-in-basic-ebpf-maps-2/

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How to share data? Any Problems?

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How to share data? https://mostlynerdless.de/blog/2024/01/12/hello-ebpf-recording-data-in-basic-ebpf-maps-2/

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eBPF Maps

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eBPF Maps Map Types ● (LRU) Hash Maps ● Arrays ● Ring Buffers ● … https://mostlynerdless.de/blog/2024/03/12/hello-ebpf-ring-buffers-in-libbpf-6/

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eBPF hooks https://ebpf.io/what-is-ebpf/

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Tracing & Profiling

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Observability and Monitoring https://coralogix.com/blog/what-ebpf-why-important-for-observability/

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Security Control https://coralogix.com/blog/what-ebpf-why-important-for-observability/ https://ubuntu.com/wp-content/uploads/1e80/AppArmour.png

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https://commons.wikimedia.org/wiki/File:CrowdStrike_BSOD_at_LGA.jpg

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eBPF has bugs too (and kernel level access) https://nvd.nist.gov/vuln/

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eBPF Ecosystem https://ebpf.io

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https://github.com/parttimenerd/hello-ebpf eBPF Ecosystem

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eBPF is a crazy technology, it’s like putting JavaScript into the Linux kernel https://www.youtube.com/watch?v=tDacjrSCeq4 “ Brendan Gregg

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eBPF is a crazy technology, it’s like putting JavaScript into the Linux kernel https://www.youtube.com/watch?v=tDacjrSCeq4 “ Brendan Gregg

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https://www.youtube.com/watch?v=X3AWV5lJ6RY

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https://www.youtube.com/watch?v=X3AWV5lJ6RY user land

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Work in Progress

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Live Coding

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Live Coding Having fun with eBPF

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Firewall Demo

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XDP https://mostlynerdless.de/blog/2024/04/22/hello-ebpf-xdp-based-packet-filter-9

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Sockets XDP

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XDP https://mostlynerdless.de/blog/2024/04/22/hello-ebpf-xdp-based-packet-filter-9

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The only way of disco- vering the limits of the possible is to venture a little way past them into the impossible. Clarke’s second law “ https://www.flickr.com/photos/itupictures/16636142906

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Project Panama

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And for the compiler nerds https://godbolt.org/z/9xoMzsc4b

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Blog Posts A post every other week since January

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A glimpse into the future Java as a first class language for eBPF

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A glimpse into the future https://www.infoq.com/presentations/facebook-google-bpf-linux-kernel/ https://en.wikipedia.org/wiki/File:Pistachio_macro_whitebackground_NS.jpg Towards a Micro-Kernel

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A glimpse into the future Kernel Fixes Reimagined https://www.infoq.com/presentations/facebook-google-bpf-linux-kernel/

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A glimpse into the future Kernel Recipes 2023 - sched_ext: pluggable scheduling in the Linux kernel

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Final thoughts!

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Thank you Mohammed Aboullaite @laytoun [email protected] Thanks to Dylan Reimerink Resources Johannes Bechberger mostlynerdless.de @parttimen3rd @[email protected]