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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Is multi user nix safe? (mander.xyz)

submitted 13 hours ago by ranzispa@mander.xyz to c/linux@lemmy.ml

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I'm thinking of setting up multi user nix on a compute cluster. The advantage would be to have a shared storage where common packages are reused, this is a great advantage compared to conda where every environment duplicates storage and inodes.

However, the packages are installed as root. As such I'm a bit wary of whether a user installing something could have the system run malware as root by installing a package.

What are the safeguards in place and how do I know I can trust them?

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[–] kevincox@lemmy.ml 2 points 10 hours ago* (last edited 10 hours ago) (1 children)

In theory it is safe. When a Nix package is built it isn't "installed". Unless root is running/installing random packages out of the Nix store there is no problem. As long as the user's aren't added to the trusted-users option they shouldn't be able to cause any problems for other users.

However like any multi-user system you are sharing a Linux kernel. A kernel is a very complex piece of software with a huge attack surface. Privileged escalation vulnerabilities are commonly found. (This also applies to the nix-daemon, but it is a bit smaller attack surface but vulnerabilities are still occasionally found.) So you shouldn't assume strong security isolation. I would say that a setup like this is acceptable for mostly-trusted people like coworkers or friends that are not expected to actively exploit vulnerabilities but definitely wouldn't let random unknown users use the system.

So if you want strong isolation use a VM or separate hardware, but then you won't be able to share the builds and packages defeating the point in this case.

[–] ranzispa@mander.xyz 1 points 9 hours ago

Thank you for the clear explanation. This is good enough for me I guess then. What I am most afraid is not really a colleague building a malicious package on purpose, but rather them installing something which is then run as root and gets access to the whole system. I understand packages are built by unprivileged users, but in the end they are owned by root.

What I wonder is whether in the way it is possible that something is run as root without someone specifically deciding it should be.