Lab 6.3, file permissions issue! First post/question!
Hi everyone! This is my first post and I feel like its a super simple one, in lab 6.3 I've created a file and changed perissions for a new user to be able to write to that file when logged into. However I keep getting "-sh: 1: cannot create /tmp/afile: Permission denied" when I try to echo a new line into the file or save a new line with nano. Any ideas?
These are the files permissions:
getfacl: Removing leading '/' from absolute path names
file: tmp/afile
owner: thomas
group: thomas
user::rw-
user:rocky:rw-
group::rw-
mask::rw-
other::rw-
Thank you!!
Answers
-
Hello, coincidentally, I am on the same lab, 6.3, and am experiencing the same issue.
I can read the file with vi editor, but cannot write to it.
Also, echo This is a new line >> /tmp/afile is getting a permission denied result.My commands are:
setfacl -m u:testuser:rw /tmp/afilegetfacl /tmp/afile
file: tmp/afile
owner: janderson
group: janderson
user::rw-
user:testuser:rw-
group::rw-
mask::rw-
other::---testuser@Ubuntoo2204:~$ cat /tmp/afile
This is a filetestuser@Ubuntoo2204:~$ echo This is a new line >> /tmp/afile
-bash: /tmp/afile: Permission denied1 -
For some permissions on /tmp, it's not possible to modify the file. So I created a subdirectory called "test" on /tmp, so it's /tmp/test. I moved the "afile" file to the new directory, /tmp/test. Did the test again and it worked.
Please confirm if the workaround works for you.
Regards,
Luis.0 -
Okay, my thought was that the /tmp directory was not allowing x(executable) for the 'other' permission.
On the /tmp directory, I changed the 'other' or 'world' permission from t(sticky)bit to x via chmod o=rwx /tmp. The original for o was rwt.
I can now write to the afile file in the /tmp directory.I put the t(sticky)bit back onto the /tmp directory for I don't want to change any global/system settings on the directory.
I tried adding the testuser to the facl on the /tmp directory with rwx, still unable to write to the afile file just using the facl feature by itself.
I moved the afile to my home directory. My home directory is allowing x for 'world'.
I added testuser to the facl with rw- on the afile and am able to read/write to it.
When I remove testuser from the facl, rw permission is denied as expected.I don't know if using a system directory is the best way to test the facl feature. But, I'm new to all of this, so I may be way off.
0 -
Hi @jma0770,
Okay, my thought was that the /tmp directory was not allowing x(executable) for the 'other' >permission.
On the /tmp directory, I changed the 'other' or 'world' permission from t(sticky)bit to x via chmod >o=rwx /tmp. The original for o was rwt.
I can now write to the afile file in the /tmp directory.That looks too messy.
So, this is what I did on Ubuntu 22.04 LTS and worked for me:
In window 1:
1.- echo This is a file > /tmp/afile
2.- mkdir /tmp/test
3.- mv /tmp/afile /tmp/test
4.- setfacl -m u:fool:rw /tmp/test/afileIn window 2 with user "fool":
1.- echo another line > /tmp/test/afile
==> That worked.
Regards,
Luis.1 -
@luisviveropena
That worked for me as well!1 -
@jma0770 that's nice!!
Regards,
Luis.0 -
@luisviveropena This worked thank you! And the reason it wasn't working before is due to the permissions in the /tmp directory as a whole?
1 -
Hi @tpcm ,
This worked thank you!
It's a pleasure!
And the reason it wasn't working before is due to the permissions in the /tmp directory as a whole?
Yep, it's about the Sticky Bit on /tmp.
Regards,
Luis.0 -
How are you guys using the second window, after sudo su - fool, to even GET to the first window/user's directory? I can't cd in and ls tells me the directory doesn't exist (which is right, because I didn't make a home/fool dir).
Realized that I needed to cd into the directory BEFORE sudo su , then ls lists "afile".
0 -
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