Need assistance on ACL

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Top Forums UNIX for Advanced & Expert Users Need assistance on ACL
# 1  
Old 08-10-2012
Need assistance on ACL

Hi Friends,

I went through the ACL threads that were posted in the past but none were matching to my requirement . Hence starting a new thread .

Challenge :
user : a
group : Test1

user: b
group: Test2

Say under user a i create dir /tmp/debug with the privilege of 755 and also setfacl as setfacl -m d:g:Test2:rwx /tmp/debug . Why is that i am still not able to create any files in the directory as the user b even though the group Test2 is been granted full access .

below is the demo for the same :
Oracle Linux Server release 6.2
[root tmp]# groupadd test1
[root tmp]# groupadd test2
[root tmp]# useradd -g test1 a
[root tmp]# useradd -g test2 b
[root tmp]# passwd a
Changing password for user a.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root tmp]# passwd b
Changing password for user b.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root tmp]# su - a
[a ~]$ cd /tmp
[a tmp]$ id a
uid=517(a) gid=1039(test1) groups=1039(test1)
[a tmp]$ id b
uid=518(b) gid=1042(test2) groups=1042(test2)
[a tmp]$ mkdir debug
[a tmp]$ ls -tld debug/
drwxr-xr-x 2 a test1 4096 Aug 10 16:02 debug/
[a tmp]$ chmod 755 debug
[a tmp]$ ls -tld debug/
drwxr-xr-x 2 a test1 4096 Aug 10 16:02 debug/
[a tmp]$ id
uid=517(a) gid=1039(test1) groups=1039(test1)
[a tmp]$ setfacl -m  d:g:test2:rwx /tmp/debug
[a tmp]$ getfacl /tmp/debug
# file: tmp/debug
# owner: a
# group: test1

[a tmp]$ id
uid=517(a) gid=1039(test1) groups=1039(test1)
[a tmp]$ su - b
[b ~]$ cd /tmp/debug/
[b debug]$ touch 1
touch: cannot touch `1': Permission denied
[b debug]$ pwd

Any early response would be highly appreciated.

Moderator's Comments:
Mod Comment Please view this code tag video for how to use code tags when posting code and data.

Last edited by Corona688; 08-10-2012 at 12:47 PM..
# 2  
Old 08-11-2012
Please post what Operating System and version you are running and what Shell you prefer.

The /tmp directory is special on all correctly-configured systems. It should stop one user interfering with the files of another user.

Please post:
ls -lad /tmp

# 3  
Old 08-14-2012
$ ls -lad /tmp
drwxrwxrwt 16 root root 4096 Aug 14 10:44 /tmp

Last edited by Scott; 08-14-2012 at 05:36 AM.. Reason: Code tags
# 4  
Old 08-19-2012
Though you omitted to mention the Operating System and version, on most modern versions of unix/Linux those permissions on /tmp will stop one user interfering with another user's files. See the special meaning of what used to be known as the "Sticky Bit" in your version of man chmod. When the "Sticky Bit" is set on /tmp the ls -lad /tmp shows a t attribute. You will be well advised to not change the permissions of /tmp.
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