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Shawn Webb runs HardenedBSD

As a teenager, I immersed myself in learning the art of computer exploitation. Wading through buffer overflows and format string vulnerabilities, I learned the importance of exploit mitigations and system hardening practices.

To illustrate, free dial-up ISPs required the use of adware as the method of connecting to the internet. The adware would dial in, authenticate, and show you ads via an always-in-focus window. Since my family didn't have the means by which to pay for internet access, we were left to use these free dial-up ISPs. Fed up with the waste of precious 33.6Kbps bandwidth, I learned how to reverse engineer the adware and devised a solution for always-on, banner-free, and cost-free internet.

Back then, I used Red Hat Linux 6. Not RHEL, but Red Hat. The Red Hat distribution that you found attached to a geeky magazine at your local Barnes and Noble. By this time, I learned how to script and would auto-connect to the internet whenever the dial-up connection disconnected. Having only one phone line, my parents surely missed out on countless important calls.

Fellow hackers taught me the beauty of FreeBSD 4.0. Jails made their debut. I instantly fell in love with how coherent and organized FreeBSD was (and still is). During this time, I studied exploitation deeply on Linux and FreeBSD. I learned the importance of exploit mitigations, especially since software written by imperfect humans will always have imperfections.

Fast forward a few years. It's now 2005. I left the hacking scene for a couple of years to focus on religious studies and serve a mission. After coming back in 2007, I resumed computering.

Inspired by Andrew Griffiths' Binary Protection Schemes paper, I worked on a project called libhijack, a post-exploitation tool to make runtime process infection via ptrace abuse easy. Originally developed against Linux, I eventually ported the project to FreeBSD. The project is still active and now only targets FreeBSD amd64 and arm64 systems.

A few more years passed, and I felt the need to help increase the security of FreeBSD. In 2013, I set out to implement Address Space Layout Randomization (aka, ASLR). Oliver Pinter, who happened to be already working on an ASLR patch, caught wind of my desire for ASLR in FreeBSD. Oliver and I joined forces. HardenedBSD was officially formed in 2013, with the website being launched in 2014.

Originally, my efforts in HardenedBSD were meant to simply be a staging area. All features were to be merged upstream to FreeBSD. Unfortunately, that idea didn't pan out. Instead, HardenedBSD continues to this day to innovate with unique implementations and integrations of various exploit mitigations. ASLR was only the beginning and HardenedBSD has moved on to other exploit mitigations and security enhancements. The primary goal, yet to be achieved, is a clean-room reimplementation of the grsecurity patchset for the BSD community.

All of my systems (laptops, desktops, servers) run either HardenedBSD -CURRENT or HardenedBSD 11-STABLE. The only systems that don't run HardenedBSD are his Android devices (phone and tablet). My home is wired for multiple networks, including a fully Tor-ified network. To be behind Tor, all I have to do is plug in to a special network jack in the wall. All traffic automagically gets routed through Tor without any special configuration on the connected system. HardenedBSD is the only operating system I feel comfortable with in doing something like that.

I am currently researching Cross-DSO CFI (applying Control Flow Integrity to applications and shared objects alike) on amd64 and am porting SafeStack to arm64. I am also setting up the HardenedBSD Foundation, a 501(c)(3) not-for-profit, tax-exempt organization in the US. The Foundation will help ensure HardenedBSD remains successful and has the resources it needs to live on.

Find me on Twitter and Mastodon.
Contact me via Tor-ified Signal (subject to change) +1 443-546-8752

9 Aug 2018


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