File permissions

[Verónica Muñoz Segovia]

Hi everybody,

I'm trying to restrict some files permissions to an account on my system. But I even deny all the permissions to the files and the user can delete them. For example:

I have the file hola.txt without any kind of permissions (000), and when the user type rm hola.txt, I have the follow message:

hola.txt: 0 mode ? (y/n)

And if the user pulse y, he can delete the file, somebody could tell me why? and how can I avoid this? The only permisson that he could have is the execute permisson.

Thank you.

[Jitendra_1 · Accepted solution]

Thats perfectly normal. The file with 000 permission can be removed as long as the directory has write permissions for that user. Tighten your directory permissions to something like 755.

[James R. Ferguson]

Veronica:

If the sticky bit is set on the directory, then users can only remove files for which they have explicit write permission as the owner. 'root', of course, can remove anything.

A directory with the sticky bit set will look like "dXXXXXXXXt" -- note the "t".

For instance, to set the sticky bit on /xxx, do:

# ls -l /xxx #...gives drwxr-xr-x
# chmod 1755 /xxx
# ls -l /xxx #...shows drwxr-xr-t

See the man pages for 'chmod'.

...JRF...

[Verónica Muñoz Segovia]

Thank you for the answers, this is what I did,
I change the owner of the user directory, now the will cannot delete any file.

Veronica