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Post #422 3.44K
AWS Gazo bot.

Scripts to create, customize and upload AWS images to the cloud. This is a work in progress, I'm trying to create OpenBSD images from Linux, specially using arm64 and riscv64 for AWS since OpenBSD has no vmm support for arm64 nor riscv64 yet...

https://github.com/csaltos/aws-gazo-bot

Based on the scripts created by Antoine Jacoutot at https://github.com/ajacoutot/aws-openbsd

#aws #cloud #install
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Post #421 7.44K
#art (c)
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Post #419
Channel photo updated
Post #418 3.08K
Synthetic Memory Protections.

Theo de Raadt (derradt@) was scheduled to present at CanSecWest. That's now happened, and slides of Theo's presentation, Synthetic Memory Protections, can be found in the usual place. Video is available on the bird site.

#security #video
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Post #417 2.67K
Launch OpenBSD vmd Guests on Demand from SSH.

I’d been kicking around the idea of using an ssh ProxyCommand to launch transient EC2 instances connected to long-lived EBS volumes so I figured – why not implement this for vmd hosts? I could forward Linux X11 apps to my desktop & be able to use Signal...

https://jonwillia.ms/2023/03/20/vmctl-ssh

#vmd #virtualization #openssh
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Post #415 2.68K
Is OpenBSD for you?

This blog post is a step by step wizard for those who think about using OpenBSD as a primary OS and daily driver, but don't know if it meets the requirements. I am trying to focus on desktop/laptop use in this case...

https://mizik.eu/blog/is-openbsd-for-you/index.html

#system #hardware #install
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Post #414 3.01K
How To Set Up a Wireguard VPN Server with Unbound on OpenBSD.

Some months ago, I published an article on how to set up a Wireguard server with adblocking capabilities on GNU/Linux systems, focusing Debian and PiHole specifically. Recently I wanted to reproduce the same setup on an OpenBSD server(since the Wireguard protocol is available on *BSD systems as well) and, while PiHole is not currently available for *BSD systems, I managed to accomplish the same result using the DNS resolver unbound(8) and unbound-adblock to fetch updated blocklists every day. In this guide, I will show you how to achieve the same result...

https://marcocetica.com/posts/wireguard_openbsd/

#wirequard #vpn #security
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Post #412 1.98K
Initial support for guided disk encryption in the installer.

The OpenBSD installer now has basic support for configuring disk encryption during the regular installation process. Previously, disk encryption needed to be set up manually by dropping to the shell from the installer. Initial support, likely to be expanded upon, was committed by Klemens Nanni (kn@) on March 7, 2023...

https://undeadly.org/cgi?action=article;sid=20230308063109

#security #encryption #install
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Post #409 2.37K
Analysis of Speedup Gain of Undefined Behavior Optimizations in OpenBSD.

The ISO C Standard added the undefined behavior notion as a mean to portability. State-of-the-art compilers such as GCC and Clang/LLVM use it to issue aggressive optimizations that break the the intention of the progammer. We argue that the performance impact of undefined behavior (UB) optimizations in operating systems, such as OpenBSD, is low. Furthermore they introduce unobservable and undocumented effects that have great impact of program robustness and security. To test our hypothesis we take the compiler implementation used in OpenBSD, i.e.Clang/LLVM, and disable all undefined behavior optimizations.Then we compare the performance of the system on multiple hardware architectures with the above mentioned optimizations turned on and off...

https://tildegit.org/lucic71/dissertation/src/branch/master/TSW/tsw.pdf

#system #optimizations
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Post #408 2.15K
🎄Happy New Year, folks!
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Post #405 1.7K
🎄 Merry Christmas! ✨
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Post #404 1.93K
GCC now includes Modula-2 and Rust. Do they work on OpenBSD?

Two new language frontends have been added to GCC: Modula-2 and Rust. I think this is great news on both accounts: having a Wirth language in GCC fills my childhood heart with joy (though I do wish GNU Pascal can one day be revived and mainlined, as Pascal was the first non-BASIC language I learned). And Rust appears here to stay, so having more than just the one official compiler seemed all but inevitable. I think both languages make sense for GCC and am glad to see that they will be making the upcoming GCC 13.1. Let's see how they fare on OpenBSD...

https://briancallahan.net/blog/20221219.html

#gcc #modula2 #rust
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Post #403 2.03K
mimmutable() for OpenBSD.

Virtual-memory systems provide a great deal of flexibility in how memory can be mapped and protected. Unfortunately, memory-management flexibility can also be useful to attackers bent on compromising a system. In the OpenBSD world, a new system call is being added to reduce this flexibility; it is, though, a system call that almost no code is expected to use.

https://lwn.net/SubscriberLink/915640/53bc300d11179c62/

#security #system #memory
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