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!
SMK
Comments
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Hello SMK,
Are you sure you want to add a normal user to the root group? Is that a good idea? If you want to know why you can't access that directory you can see it here:
ls -l /
Regards,
Luis.
0 -
Hello Luis
Thank you for your response. I am attempting to add a normal user to the root group only to learn the concepts - would not do that on a live system.
If a user is in the root group, I believe they should have access to everything that root does. I see the output of ls -l / but that does not make it clear to me why I cannot access a folder /root/quotamnt.
Best Regards
SMK
0 -
Hello Luis
Thank you for your response. I am attempting to add a normal user to the root group only to learn the concepts - would not do that on a live system.
If a user is in the root group, I believe they should have access to everything that root does. I see the output of ls -l / but that does not make it clear to me why I cannot access a folder /root/quotamnt.
Best Regards
SMK
0 -
Hello Luis
Thank you for your response. I am attempting to add a normal user to the root group only to learn the concepts - would not do that on a live system.
If a user is in the root group, I believe they should have access to everything that root does. I see the output of ls -l / but that does not make it clear to me why I cannot access a folder /root/quotamnt.
Best Regards
SMK
0 -
Hello Sadamahan,
You may start studying Chapter 35. File permissions and ownership, I think that should be enough to understand this. If after that you still are unclear, please go back here.
Regards,
Luis.
0 -
Please try adding to another group, not root. Not only is this a very very bad idea, but exactly what would happen is likely to differ on different systems. I have never seen someone do this.
0
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