[systemd-devel] How to prevent users form seeing other user processes with loginctl/systemctl ?

[antisimus]

Hello,

Is there a way to hide process information (pids, command line) and prevent
one user accessing other user processes information.

On a shared system this can be a potential security risk and I really do
not like idea users inspecting each other's running processes.
Here I have user *bob *accessing user *alice *process info but same can be
done even to inspect *root *users processes

systemd 247 (247.3-7+deb11u2)
Linux systemd-vps 5.10.0-23-amd64 #1 SMP Debian 5.10.179-1 (2023-05-12)
x86_64 GNU/Linux

bob at systemd-vps:~$ loginctl user-status alice
alice (1002)
           Since: Sun 2023-06-04 08:37:18 UTC; 2min 39s ago
           State: active
        Sessions: *7
          Linger: no
            Unit: user-1002.slice
                  ├─session-7.scope
                  │ ├─1025 sshd: alice [priv]
                  │ ├─1046 sshd: alice at pts/1
                  │ ├─1047 -bash
                  │ ├─1305 bash myapp.sh
                  │ └─1306 sleep 5
                  └─user at 1002.service
                    └─init.scope
                      ├─1028 /lib/systemd/systemd --user
                      └─1029 (sd-pam)



 bob at systemd-vps:~$ loginctl user-status root
root (0)
           Since: Sun 2023-06-04 09:43:03 UTC; 3min 45s ago
           State: active
        Sessions: 5 *1
          Linger: no
            Unit: user-0.slice
                  ├─session-1.scope
                  │ ├─740 sshd: root at pts/0
                  │ ├─765 -bash
                  │ ├─769 su - bob
                  │ ├─770 -bash
                  │ ├─877 loginctl user-status root
                  │ └─878 less
                  ├─session-5.scope
                  │ ├─820 sshd: root at pts/2
                  │ ├─826 -bash
                  │ └─872 sleep 100
                  └─user at 0.service
                    └─init.scope
                      ├─747 /lib/systemd/systemd --user
                      └─748 (sd-pam)


Best regards,
Ante
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/systemd-devel/attachments/20230604/9c53dfa2/attachment.htm>