I want to allow an external user to access my unix system(through ftp) and drop/read files from one particular directory. for example the ftp user can go to directory /A/B/C and drop files to this directory or pick files from this directory.
The issue here that this after logging in using the ftp user id and password, this user can go to the root by doing a cd/ and once there, can access any files/directories that have the 666(rw_rw_rw) permissions.
How can I prevent this ftp user from accessing/seeing any directory other than /A/B/C??