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Groups > linux.debian.user > #189609 > unrolled thread

Embarrassing security bug in systemd

Started byUrs Thuermann <urs@isnogud.escape.de>
First post2017-12-06 23:20 +0100
Last post2017-12-07 08:50 +0100
Articles 7 on this page of 127 — 38 participants

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Contents

  Embarrassing security bug in systemd Urs Thuermann <urs@isnogud.escape.de> - 2017-12-06 23:20 +0100
    Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-06 23:50 +0100
      Re: Embarrassing security bug in systemd Ben Caradoc-Davies <ben@transient.nz> - 2017-12-07 00:40 +0100
        Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 03:50 +0100
          Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-07 07:30 +0100
    Re: Embarrassing security bug in systemd Ben Caradoc-Davies <ben@transient.nz> - 2017-12-06 23:50 +0100
      Re: Embarrassing security bug in systemd Dave Sherohman <dave@sherohman.org> - 2017-12-07 10:40 +0100
        Re: Embarrassing security bug in systemd Tixy <tixy@yxit.co.uk> - 2017-12-07 11:30 +0100
          Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-07 11:50 +0100
            Re: Embarrassing security bug in systemd Jimmy Johnson <field.engineer@gmail.com> - 2017-12-09 03:50 +0100
              Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 17:50 +0100
                Re: Embarrassing security bug in systemd Jimmy Johnson <field.engineer@gmail.com> - 2017-12-10 10:00 +0100
                  Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-10 20:40 +0100
        Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-07 11:40 +0100
        Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 16:00 +0100
          Re: Embarrassing security bug in systemd Michael Biebl <biebl@debian.org> - 2017-12-07 20:30 +0100
            Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-08 09:20 +0100
            Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-08 12:40 +0100
              Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-08 13:40 +0100
                Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-08 21:40 +0100
              Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-08 17:10 +0100
                Re: Embarrassing security bug in systemd Curt <curty@free.fr> - 2017-12-08 19:10 +0100
                Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-08 19:40 +0100
                Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-08 19:50 +0100
                  Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-08 20:50 +0100
                    Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-08 21:20 +0100
                      Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 09:10 +0100
                        Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 11:20 +0100
                          Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 19:40 +0100
                            Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-09 20:30 +0100
                              Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 22:00 +0100
                                Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-10 00:40 +0100
                                  Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-10 10:40 +0100
                                    Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-10 11:20 +0100
                                      Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-10 12:40 +0100
                                        Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-10 16:10 +0100
                                          Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-11 15:10 +0100
                            Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-09 21:10 +0100
                            Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 21:10 +0100
                    Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-08 21:50 +0100
                      Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-08 22:30 +0100
                        Re: Embarrassing security bug in systemd Glenn English <ghe2001@gmail.com> - 2017-12-09 02:50 +0100
                          Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-09 06:50 +0100
                          Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 09:20 +0100
                      Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 09:10 +0100
                      Re: Embarrassing security bug in systemd Christian Seiler <christian@iwakd.de> - 2017-12-15 13:30 +0100
                        Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-15 14:10 +0100
                          Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-15 16:00 +0100
                  Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-08 21:50 +0100
                    Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-08 22:40 +0100
                      Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-09 00:30 +0100
                        Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-09 10:00 +0100
          Re: Embarrassing security bug in systemd Dave Sherohman <dave@sherohman.org> - 2017-12-08 10:00 +0100
        Re: Embarrassing security bug in systemd Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-12-08 23:40 +0100
          Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-09 00:30 +0100
            Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 01:20 +0100
              Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-09 11:40 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 15:30 +0100
                  Re: Embarrassing security bug in systemd The Wanderer <wanderer@fastmail.fm> - 2017-12-10 01:00 +0100
                    Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-10 22:20 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-09 17:50 +0100
                  Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 18:20 +0100
                    Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-09 21:20 +0100
                  Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-10 12:00 +0100
                    Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-10 17:10 +0100
                      Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-10 20:40 +0100
                        Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-10 21:30 +0100
                          Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-10 23:10 +0100
                            Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-11 00:10 +0100
                              Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 00:50 +0100
                                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-11 12:30 +0100
                                  Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 13:40 +0100
                                    Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-11 14:40 +0100
                        Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-10 21:50 +0100
                          Re: Embarrassing security bug in systemd Eduardo M KALINOWSKI <eduardo@kalinowski.com.br> - 2017-12-11 13:00 +0100
                            Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-11 13:40 +0100
                            Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 16:30 +0100
                        Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-10 23:10 +0100
                          Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 01:30 +0100
                            Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 04:40 +0100
                              Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 06:10 +0100
                                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 07:40 +0100
                                  Rust? (and a wordsmithing question) (was: Re: Embarrassing security bug in systemd) rhkramer@gmail.com - 2017-12-11 15:40 +0100
                                    Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing  security bug in systemd) Darac Marjal <mailinglist@darac.org.uk> - 2017-12-11 16:00 +0100
                                      Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing security bug in systemd) rhkramer@gmail.com - 2017-12-11 18:30 +0100
                                    Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing  security bug in systemd) Joe <joe@jretrading.com> - 2017-12-11 16:30 +0100
                                      Re: Rust? (and a wordsmithing question) "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-12-11 17:40 +0100
                                        Re: Rust? (and a wordsmithing question) David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 20:10 +0100
                                        Re: Rust? (and a wordsmithing question) <tomas@tuxteam.de> - 2017-12-12 09:30 +0100
                                          Re: Rust? (and a wordsmithing question) "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-12-12 17:30 +0100
                                            Re: Rust? (and a wordsmithing question) <tomas@tuxteam.de> - 2017-12-12 17:50 +0100
                                              Re: Rust? (and a wordsmithing question) Curt <curty@free.fr> - 2017-12-12 18:20 +0100
                                                Re: Rust? (and a wordsmithing question) Richard Hector <richard@walnut.gen.nz> - 2017-12-13 04:40 +0100
                                      Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing security bug in systemd) rhkramer@gmail.com - 2017-12-11 18:30 +0100
                                    Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing  security bug in systemd) David Wright <deblis@lionunicorn.co.uk> - 2017-12-12 19:10 +0100
                              UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Jason <electron@emypeople.net> - 2018-01-09 05:10 +0100
                                Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Christian Groessler <chris@groessler.org> - 2018-01-09 16:00 +0100
                                  Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Roberto C. Sánchez <roberto@debian.org> - 2018-01-09 16:30 +0100
                                    Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Christian Groessler <chris@groessler.org> - 2018-01-09 18:10 +0100
                                  Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Erik Christiansen <dvalin@internode.on.net> - 2018-01-10 04:50 +0100
            Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-09 01:40 +0100
              Re: Embarrassing security bug in systemd Mark Fletcher <mark27q1@gmail.com> - 2017-12-09 03:10 +0100
                Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-09 10:50 +0100
          Re: Embarrassing security bug in systemd Ric Moore <wayward4now@gmail.com> - 2017-12-09 16:40 +0100
            Re: Embarrassing security bug in systemd Tom Furie <tom@furie.org.uk> - 2017-12-09 17:10 +0100
              Re: Embarrassing security bug in systemd Ben Caradoc-Davies <ben@transient.nz> - 2017-12-09 22:10 +0100
            Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 18:20 +0100
    Re: Embarrassing security bug in systemd Michael Stone <mstone@debian.org> - 2017-12-07 00:00 +0100
      Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-07 09:40 +0100
    Re: Embarrassing security bug in systemd Glenn English <ghe2001@gmail.com> - 2017-12-07 00:10 +0100
    Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-07 00:10 +0100
      Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 03:50 +0100
    Re: Embarrassing security bug in systemd Michael Lange <klappnase@freenet.de> - 2017-12-07 00:20 +0100
      Re: Embarrassing security bug in systemd "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-12-07 00:50 +0100
        Re: Embarrassing security bug in systemd Michael Stone <mstone@debian.org> - 2017-12-07 01:20 +0100
          Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 03:50 +0100
        Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-07 02:10 +0100
          Re: Embarrassing security bug in systemd Nicholas Geovanis <nickgeovanis@gmail.com> - 2017-12-07 03:40 +0100
            Re: Embarrassing security bug in systemd Eric S Fraga <e.fraga@ucl.ac.uk> - 2017-12-07 08:30 +0100
      Re: Embarrassing security bug in systemd Michael Biebl <biebl@debian.org> - 2017-12-07 00:50 +0100
        Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-07 02:40 +0100
        Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-08 10:40 +0100
          Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-08 13:40 +0100
            Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-08 20:10 +0100
    Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-07 01:10 +0100
    Re: Embarrassing security bug in systemd Eric S Fraga <e.fraga@ucl.ac.uk> - 2017-12-07 08:30 +0100
    Re: Embarrassing security bug in systemd David Baron <dbaron770@gmail.com> - 2017-12-07 08:50 +0100

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#189623

FromDejan Jocic <jodejka@gmail.com>
Date2017-12-07 02:40 +0100
Message-ID<uTTkm-7UR-19@gated-at.bofh.it>
In reply to#189619
On 07-12-17, Michael Biebl wrote:
> 
> As has already been mentioned, active, local users can shutdown/reboot
> the system without requiring a password. This is intended behaviour (for
> the reasons already mentioned) and can indeed be overridden by custom
> polkit rules.
> 

Is there anywhere in Debian documentation example, or explanation how to
override anything with custom polkit rules? I could not find it, but
guess that it is possible that somehow I've missed it.



> 
> -- 
> Why is it that all of the instruments seeking intelligent life in the
> universe are pointed away from Earth?
> 

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#189668

FromMenelaos Maglis <mmaglis@metacom.gr>
Date2017-12-08 10:40 +0100
Message-ID<uUnip-2dT-3@gated-at.bofh.it>
In reply to#189619
>>> I wonder how can such a severe bug make it into a Debian stable
>>> distribution?  And is this just an insane default setting on Debian's
>>> side or is it yet another instance of brain-dead systemd behavior?
>> 
>> Maybe I am just a brain-dead loony, but personally I prefer to be able to
>> shut down or reboot my system without having to type a password. If you
>> do not like this behavior you might have to learn how to define
>> polkit rules.
>
> For the interested reader, see
> /usr/share/polkit-1/actions/org.freedesktop.login1.policy
>
> org.freedesktop.login1.power-off has the following defaults
>
>     <defaults>
>       <allow_any>auth_admin_keep</allow_any>
>       <allow_inactive>auth_admin_keep</allow_inactive>
>       <allow_active>yes</allow_active>
>     </defaults>
>
> As has already been mentioned, active, local users can shutdown/reboot
> the system without requiring a password. This is intended behaviour (for
> the reasons already mentioned) and can indeed be overridden by custom
> polkit rules.

It is an improvement to have a consistent (central) way to configure
this behavior.

It is probably a "good thing" to allow users with physical access to
reboot/shutdown a desktop/laptop system.

It is probably not a preferred solution for a multi-user/server system.

One user group can say to the other "go an change the default policy",
or the installer can pick the "the right thing to do" based on the
installation profile...

Regards,
Menelaos Maglis

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#189671

FromRoberto C. Sánchez <roberto@debian.org>
Date2017-12-08 13:40 +0100
Message-ID<uUq6B-40S-5@gated-at.bofh.it>
In reply to#189668
On Fri, Dec 08, 2017 at 10:17:36AM +0100, Menelaos Maglis wrote:
> 
> It is an improvement to have a consistent (central) way to configure
> this behavior.
> 
> It is probably a "good thing" to allow users with physical access to
> reboot/shutdown a desktop/laptop system.
> 
> It is probably not a preferred solution for a multi-user/server system.
> 
It is a definitely a bad thing to silently change/break an existing
configuration.

That is really the problem that I have with this while issue that was
brought up.  I get that it is a "sensible" default to allow users on the
console (TTY or via DM) permission to reboot the machine.  However, when
an admin has configured the system to disallow that sort of thing, it is
frustrating to have a new thing come along and not respect the
configuration.  It is even more frustrating when the fact that the new
thing ignores the configuration is not even documented where one would
expect it (i.e., the Debian release notes in this case).

Regards,

-Roberto

-- 
Roberto C. Sánchez

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#189685

Fromdeloptes <deloptes@gmail.com>
Date2017-12-08 20:10 +0100
Message-ID<uUwc1-842-5@gated-at.bofh.it>
In reply to#189671
Roberto C. Sánchez wrote:

> That is really the problem that I have with this while issue that was
> brought up.  I get that it is a "sensible" default to allow users on the
> console (TTY or via DM) permission to reboot the machine.  However, when
> an admin has configured the system to disallow that sort of thing, it is
> frustrating to have a new thing come along and not respect the
> configuration.  It is even more frustrating when the fact that the new
> thing ignores the configuration is not even documented where one would
> expect it (i.e., the Debian release notes in this case).

This is also my problem with systemd and the main reason to either deny it
or use it with caution.
This is also typical to some of the developers standing behind it. Which is
one more reason

regards

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#189620

FromDavid Wright <deblis@lionunicorn.co.uk>
Date2017-12-07 01:10 +0100
Message-ID<uTRVf-79B-11@gated-at.bofh.it>
In reply to#189609
On Wed 06 Dec 2017 at 22:52:17 (+0100), Urs Thuermann wrote:
> Yesterday, my 10 years old son logged into my laptop running Debian
> jessie using his account, and curiously asked if he is allowed to try
> the /sbin/reboot command.  Knowing I have a Linux system as opposed to
> some crappy Win machine, I replied "sure, go ahead and try".  Seconds
> later I was completely shocked when the machine actually rebooted...

That's a lot of typing! I just type Ctrl-Alt-Backspace Ctrl-Alt-Del
to reboot, or tap the power button to shut down. I've also noticed
that I don't need to type any password to close the lid.
Presumably your son has progressed beyond mischievously holding down
the power button.

Cheers,
David.

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#189632

FromEric S Fraga <e.fraga@ucl.ac.uk>
Date2017-12-07 08:30 +0100
Message-ID<uTYN4-33Y-11@gated-at.bofh.it>
In reply to#189609

[Multipart message — attachments visible in raw view] — view raw

On Wednesday,  6 Dec 2017 at 22:52, Urs Thuermann wrote:
> Yesterday, my 10 years old son logged into my laptop running Debian
> jessie using his account, and curiously asked if he is allowed to try
> the /sbin/reboot command.

Security issues etc. aside, I love the fact that your 10 year old is
asking such a question!
-- 
Eric S Fraga via Emacs 27.0.50, org 9.1.4

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#189633

FromDavid Baron <dbaron770@gmail.com>
Date2017-12-07 08:50 +0100
Message-ID<uTZ6p-3bI-1@gated-at.bofh.it>
In reply to#189609
On יום רביעי, 6 בדצמבר 2017 22:52:17 IST Urs Thuermann wrote:
> Yesterday, my 10 years old son logged into my laptop running Debian
> jessie using his account, and curiously asked if he is allowed to try
> the /sbin/reboot command.  Knowing I have a Linux system as opposed to
> some crappy Win machine, I replied "sure, go ahead and try".  Seconds
> later I was completely shocked when the machine actually rebooted...
> 
> Of course, my son doesn't have any special privileges, no entry in
> /etc/sudoers, etc.  But then I see
> 
>     $ ls -l /sbin/reboot
>     lrwxrwxrwx 1 root root 14 Apr  8  2017 /sbin/reboot -> /bin/systemctl
>     $ ls -l /bin/systemctl
>     -rwxr-xr-x 1 root root 538904 Apr  8  2017 /bin/systemctl
>     $ dpkg -S /bin/systemctl
>     systemd: /bin/systemctl
> 
> The /bin/systemctl binary is not suid root, so I assume[1] it
> communicates to systemd which then reboots the machine without
> checking what user the request comes from.
> 
> I wonder how can such a severe bug make it into a Debian stable
> distribution?  And is this just an insane default setting on Debian's
> side or is it yet another instance of brain-dead systemd behavior?
> 
> Searching the man pages I couldn't find a way to fix this.  How can
> that be stopped?
> 
> [1] Of course, this is not docuemented in systemctl(1) as usual with
>     systemd.  Also, according to the man page, systemctl must be
>     called with a "COMMAND" argument which /sbin/reboot doesn't do.
>     Obviously, systemctl looks at the name it was called and somehow
>     uses that as command.  The admin shall guess about this.
> 
> 
> urs

I find I need to use "sudo" to shutdown or reboot. That is using those 
(pseudo?) commands. Maybe their scripts check before going to sysemctl

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