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Thread: shutdown without su priv

  1. #1
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    shutdown without su priv

    found anyone can pass shutdown commands with switches to ubuntu 16.04 without su
    just seems a big control issue

    shutdown -r now
    shutdown -h now

    Cheers c

  2. #2
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    Re: shutdown without su priv

    I admit I was surprised to see your post and immediately tried this out, and you are correct, with no query of "Are you sure?" or anything like that.

    I will investigate further.
    DISTRO: Xubuntu 20.04-64bit --- Code-tags --- Boot-Repair --- Grub2 wiki & Grub2 Basics --- RootSudo --- Wireless-Info --- SolvedThreads

  3. #3
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    Re: shutdown without su priv

    Not seeing any systemd bugs in Launchpad that match this description.
    Perhaps you are the first to discover....

  4. #4
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    Re: shutdown without su priv

    Here you go. It seems it is a feature, not a problem.

    http://askubuntu.com/questions/77474...s-in-ubuntu-16
    http://askubuntu.com/questions/78905...again-in-16-04

    It doesn't tell us why, but does seem to suggest it is a deliberate decision.
    DISTRO: Xubuntu 20.04-64bit --- Code-tags --- Boot-Repair --- Grub2 wiki & Grub2 Basics --- RootSudo --- Wireless-Info --- SolvedThreads

  5. #5
    Join Date
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    Re: shutdown without su priv

    Quote Originally Posted by colmax View Post
    found anyone can pass shutdown commands with switches to ubuntu 16.04 without su
    just seems a big control issue
    Why? Can't see any reason why shutting down or restarting should require root auth.

  6. #6
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    Xubuntu 20.04 Focal Fossa

    Re: shutdown without su priv

    Quote Originally Posted by mc4man View Post
    Why? Can't see any reason why shutting down or restarting should require root auth.
    You're thinking of a "typical" client desktop computer. I can think of several situations this could be quite bad on a server.

  7. #7
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    Re: shutdown without su priv

    And if more than one user was logged in it could be a problem in a desktop.

    Thinking about that; can more than one user be logged in at the same time? I have only one user on any of my computers so I don't know the answer to that question.
    DISTRO: Xubuntu 20.04-64bit --- Code-tags --- Boot-Repair --- Grub2 wiki & Grub2 Basics --- RootSudo --- Wireless-Info --- SolvedThreads

  8. #8
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    Re: shutdown without su priv

    Quote Originally Posted by ajgreeny View Post
    And if more than one user was logged in it could be a problem in a desktop.

    Thinking about that; can more than one user be logged in at the same time? I have only one user on any of my computers so I don't know the answer to that question.
    If another user is logged in the command won't complete & you're informed of such. It does also provide & inform of a systemctl command to override & do a shutdown/reboot if desired.
    It would be impracticable to require root auth to restart or shut down, how would a non admin user do so, wait until admin user was available?

  9. #9
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    Re: shutdown without su priv

    Quote Originally Posted by mc4man View Post
    <Snip>
    It would be impracticable to require root auth to restart or shut down, how would a non admin user do so, wait until admin user was available?
    The GUI allows shutdown and restart with no root authorisation, and always has done so, as far as I'm aware, but doing so in terminal or command-line TTYs, and perhaps therefore in most servers, has always in the past needed authorisation.
    DISTRO: Xubuntu 20.04-64bit --- Code-tags --- Boot-Repair --- Grub2 wiki & Grub2 Basics --- RootSudo --- Wireless-Info --- SolvedThreads

  10. #10
    Join Date
    Jan 2007
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    763
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    Ubuntu 18.04 Bionic Beaver

    Re: shutdown without su priv

    I just tried it in my 16.04 VM. If I launch a terminal from the desktop and run "shutdown -r now" it shuts down with no superuser privileges required.

    If I access a shell via ssh and run "shutdown -r now" it doesn't work without sudo.

    So, it's only when you're on the desktop itself that you can shutdown without privileges. Remote access still requires sudo.

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