Linux ACL odd output

mr.aghazade · 07-16-2019, 02:19 AM

hi friends
i have a senario but i cant implement that
i create a file with some text in it & remove all permissions :

Code:

# echo "hi Linux" > myFile
# chmod a-rwx myFile
# ls -l myFile
---------- 1 root root 9 Jul 15 11:41 myFile

i have a user with name reza & i want only reza user can read this file & do this via ACL(Access Control List)

Code:

# setfacl -m u:reza:r myFile

output of ls -l is very ODD:

Code:

# ls -l myFile
----r-----+ 1 root root 9 Jul 15 11:41 myFile

read permission added for root group ,,,,what is it mean ?

Code:

# getfacl myFile
# file: myFile
# owner: root
# group: root
user::---
user:reza:r--
group::---
mask::r--
other::---

& in output of getfacl command, what is the mask ??

thank you for answring...

scasey · 07-16-2019, 10:46 AM

Code:

setfacl -m u:reza:r myFile

According to the man page, this grants read access to an "additional" user. Can that user now access the file?

See man getfacl for what the mask is/means.

mr.aghazade · 07-18-2019, 08:35 AM

Quote:

Originally Posted by scasey

Code:

setfacl -m u:reza:r myFile

According to the man page, this grants read access to an "additional" user. Can that user now access the file?

See man getfacl for what the mask is/means.

thank you for aswering...
yes,,the Additional user can access data ,

my question is about realation between ACL & group user.
because ACL permission shown as group permission...

scasey · 07-18-2019, 08:47 AM

It's my understanding that's what access control lists are about; group permissions.