May 26, 2017

Access control through group membership

Hello Everyone

Can someone please help me understand why user smk cannot access a folder /root/quotamnt when user smk belongs to a valid group (root) that is authorized to access the folder (/root/quotamnt).

Have a folder /root/quotamnt that allows users in group "root": 

root@SandBox1:~# ls /root/quotamnt

drwxr-xr-x  3 root root 1.0K May 24 14:41 quotamnt

Then added user smk to group "root":

smk@SandBox1:~$ sudo usermod -a -G root smk

Verify it exists:

smk@SandBox1:~$ groups smk
smk : smk root adm cdrom sudo dip plugdev lpadmin sambashare

Logged out and logged back in as smk.

Why can't smk access /root/quotamnt:

smk@SandBox1:~$ ls /root/quotamnt
ls: cannot access '/root/quotamnt': Permission denied

Thanks in advance!




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