On 26Oct2018 03:10, Patrick Dupre <pdupre@xxxxxxx> wrote:
On 10/25/18 4:55 PM, Patrick Dupre wrote:
> On Thu, Oct 25, 2018 at 10:40 AM Patrick Dupre <pdupre@xxxxxxx
> <mailto:pdupre@xxxxxxx>> wrote:
> I do not understand this error message:
> /sbin/shutdown -h +70
> Failed to set wall message, ignoring: Interactive authentication
> required.
> Failed to call ScheduleShutdown in logind, proceeding with immediate
> shutdown: Interactive authentication required.
>
> Did you run it as root or with sudo?
>
> In visudo, I have
> pdupre localhost=/sbin/shutdown -h +70
That wasn't the question. Did you "sudo /sbin/shutdown -h +70" or did
you simply run it as yourself ("/sbin/shutdown -h +70")?
If the latter, you're not root (nor are you sudo'd to root). Both
wall messages to all users (the first message) and shutdown (the second
message) can only be done by someone with root privileges. If a normal
user tries either, they must authenticate and they must be members of
the "wheel" group (admins).
Really!!
Here is my understanding.
The setting of visudo also the user pdupre to run the line command without being root.
(just /sbin/shutdown -h 70)
This is incorrect. The visudo line says you may _use sudo_ to invoke
shutdown as root.
Actually, in 90% of the cases the line command works without complain, but sometimes
it does not work and I do not understand why.
We'd need to see the complaint. But maybe shutdown itself has a list of
users (probably via a group) who may run it? See "man shutdown" to find
out. It should say.
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
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