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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).

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Elevate privileges between Python program ( and Inter-process_communication ) (programming.dev)

submitted 5 months ago by SpongeB0B@programming.dev to c/linux@lemmy.ml

5 comments fedilink hide all child comments

Hi everyone,

I have a Python program (A) that run under a regular user account. (good)

When some events occur in (A) I need to modify my nftables and only the root is allowed to do so.

I've come up with 3 ways to do that (if you know other please share) but I don't which would be the best.

Make a sudo call from (A) with from subprocess import run but I will need to store the password ! and I don't think is possible to keep it encrypted and decrypted when need it (it's a flaw)
.
Make (A) writing a file with the requests. Create a (B) daemon (that run as root) that check that file every X and do the necessary
.
Make (A) do an IPC ( Linux socket ) to (B) daemon (that run as root) and does the necessary.

I suppose that the solution 2 is less heavy that the 3 ? But if I'm not mistaken it will react also slower ?

Thanks.

🐧

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[–] axzxc1236@lemm.ee 7 points 5 months ago

If your command doesn't change (doesn't require dynamic input), sudoers file can make specific command+argument run without password required.

https://www.cyberciti.biz/faq/linux-unix-running-sudo-command-without-a-password/ (ctrl+f search "A better solution")

(You can also use wildcards in sudoers file but with nftables I imagine it's a big security risk)

[–] taaz@biglemmowski.win 4 points 5 months ago* (last edited 5 months ago) (1 children)

Is the usual solution, but instead of file use unix socket and user/group permissions as auth - the running user has to be part of some group so that the control client (A) can access the control socket of (B) daemon.

Alternatively you could use capabilities:

https://stackoverflow.com/a/414258

https://man7.org/linux/man-pages/man7/capabilities.7.html

[–] SpongeB0B@programming.dev 2 points 5 months ago (1 children)

Thank you very much @taaz

So you say 2 but with unix socket so it the same as my proposal number 3 ? no ?

I'll check capabilities

[–] taaz@biglemmowski.win 2 points 5 months ago

Yeah kinda, unix socket does count as ipc

[–] fubarx@lemmy.ml 1 points 5 months ago

Have you looked into the suid bit? You can set it on the file, then change the script owner to root and it runs in elevated mode: https://linuxhandbook.com/suid-sgid-sticky-bit/