I'm using Raspbian Stretch Lite and I followed an official tutorial from RapberryPi.org to set up Pure-FTPd. So now I have a virtual user that can create files through FTP owned by ftpuser:ftpgroup.
I also add pi user in ftpgroup with following command :
usermod -a -G ftpgroup pi
But when I try to delete a file created by ftpuser it says
Operation not permitted
Here is a copy of my console :
pi@raspberry(rw):/var/ftp$ ls -la
total 4
drwxrwxrwt 2 root root 60 Jun 20 15:58 .
drwxr-xr-x 11 root root 4096 May 7 17:04 ..
-rwxrwxrwx 1 ftpuser ftpgroup 0 Jun 20 16:03 test
pi@raspberry(rw):/var/ftp$ whoami
pi
pi@raspberry(rw):/var/ftp$ grep -i --color 'ftpgroup' /etc/group
ftpgroup:x:1001:pi
pi@raspberry(rw):/var/ftp$ rm test
rm: cannot remove 'test': Operation not permitted
I don't understand why I can't remove test file if I'm in the ftpgroup and group has write permission.
You need write permissions om the directory as well. You change the TOC.
To illustrate this:
[ronald@lion tmp]$ ls -la
total 0
drwxr-xr-x. 2 root root 19 Jun 20 15:48 .
drwx------. 6 ronald ronald 195 Jun 20 15:48 ..
-rw-r--r--. 1 ronald ronald 0 Jun 20 15:48 hallo
[ronald@lion tmp]$ rm hallo
rm: cannot remove ‘hallo’: Permission denied
[ronald@lion tmp]$ id
uid=1000(ronald) gid=1000(ronald) groups=1000(ronald) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[ronald@lion tmp]$ su
Password:
[root@lion tmp]# chmod 777 .
[root@lion tmp]# exit
[ronald@lion tmp]$ ls -la
total 0
drwxrwxrwx. 2 root root 19 Jun 20 15:48 .
drwx------. 6 ronald ronald 195 Jun 20 15:48 ..
-rw-r--r--. 1 ronald ronald 0 Jun 20 15:48 hallo
[ronald@lion tmp]$ rm hallo
[ronald@lion tmp]$