this post was submitted on 10 Feb 2025
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    I didn't know you were supposed to disable root user... (linux.community)
    submitted 1 month ago by Tablaste@linux.community to c/linuxmemes@lemmy.world
    175 comments fedilink hide all child comments
     

    Background: 15 years of experience in software and apparently spoiled because it was already set up correctly.

    Been practicing doing my own servers, published a test site and 24 hours later, root was compromised.

    Rolled back to the backup before I made it public and now I have a security checklist.

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    [–] electric_nan@lemmy.ml 43 points 1 month ago (3 children)

    Do not allow username/password login for ssh. Force certificate authentication only!

    [–] LordCrom@lemmy.world 12 points 1 month ago (1 children)

    If it's public facing, how about dont turn on ssh to the public, open it to select ips or ranges. Use a non standard port, use a cert or even a radius with TOTP like privacyIdea. How about a port knocker to open the non standard port as well. Autoban to lock out source ips.

    That's just off the top of my head.

    There's a lot you can do to harden a host.

    [–] Faresh@lemmy.ml 2 points 1 month ago (1 children)

    dont turn on ssh to the public, open it to select ips or ranges

    What if you don't have a static IP, do you ask your ISP in what range their public addresses fall?

    [–] LordCrom@lemmy.world 2 points 1 month ago

    Sure. My ISP gave me this range for this exact reason.

    [–] SpaceCadet@feddit.nl 3 points 1 month ago

    Do not allow username/password login for ssh

    This is disabled by default for the root user.

    $ man sshd_config

...
       PermitRootLogin
               Specifies whether root  can  log  in  using  ssh(1).   The  argument  must  be  yes,  prohibit-password,
               forced-commands-only, or no.  The default is prohibit-password.
...
    [–] sommerset@thelemmy.club 0 points 1 month ago

    Why though? If u have a strong password, it will take eternity to brute force