Linux

53128 readers

1342 users here now

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.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

[email protected]

Why disable ssh login with root on a server if I only log in with keys, not password? (sh.itjust.works)

submitted 4 days ago* (last edited 4 days ago) by [email protected] to c/[email protected]

81 comments fedilink hide all child comments

On a server I have a public key auth only for root account. Is there any point of logging in with a different account?

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 6 points 4 days ago* (last edited 4 days ago) (1 children)

Also double check that sudo is the right command, by doing which sudo. Something I just learned to be paranoid of in this thread.

Unless which is also compromised, my god…

[–] [email protected] 3 points 3 days ago* (last edited 3 days ago) (1 children)

which sudo will check $PATH directories and return the first match, true. however when you type sudo and hit enter your shell will look for aliases and shell functions before searching $PATH.

to see how your shell will execute 'sudo', say type sudo (zsh/bash). to skip aliases/functions/builtins say command sudo

meh nvm none of these work if your shell is compromised. you're sending bytes to the attacker at that point. they can make you believe anything

[–] [email protected] 1 points 3 days ago (2 children)

Maybe if you escaped the command like \\type sudo?

[–] [email protected] 2 points 3 days ago

no, if the attacker can change files in your account, they can read every byte you type in and respond with anything, including pretending to be a normal shell. im not sure how to prevent ssh from running commands in your shell

[–] [email protected] 1 points 3 days ago

You assume the shell isn't compromised.