this post was submitted on 18 Aug 2023
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Linux
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From Wikipedia, the free encyclopedia
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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Environments are per-process. Every program can have its own environment, so don't inject secrets where they're not needed.
I'm using bubblewrap to restrict access to FS.
I am not familiar with the software bubblewrap so I am just picturing your hard drives wrapped up inside your case.
That's an old white-hat trick. If the tables drop, the wrap helps them bounce.
There you go: https://wiki.archlinux.org/title/Bubblewrap
The environment of other processes is readable in procfs.
/proc/PID/environThanks to the permissions it's read-only, and only by the user with which the process runs, but it's still bad, I think
Don't all programs run as the user anyways? That changes nothing on a single user machine
A proper server should have one user per service.
yay password rotation month
Service users generally don’t have passwords
You don't login as service users, they're just a means of taking advantage of the user separation features. They have the login shell set to /bin/false typically.
Not
/bin/nologin/?From a quick search I've just done, the major difference is that
/bin/falsecan't return any text, the only thing it can do as specified via POSIX standards is returnfalse.So if you set someone's shell to
/bin/nologinthere can be some text that says "You're not allowed shell access", similar to what happens if you try to SSH into say GitHub.Of course, for a service account that won't be operated by a person, that doesn't matter - so whichever one you use is just whichever the operator thought of first, most likely.
true dat; false trends to CVE vs nologin
Some have their own users, like gitlab