Something

anonymous_enable=YES
anon_root=/public
anon_mkdir_write_enable=YES
anon_other_write_enable=YES
anon_upload_enable=YES
anon_umask=0775
3anon_world_readable_only=YES

file_open_mode=0755
local_enable=NO
write_enable=YES
dirmessage_enable=YES
chown_uploads=NO
xferlog_enable=YES
idle_session_timeout=600
data_connection_timeout=120
ascii_upload_enable=NO
ascii_download_enable=NO
chroot_list_enable=NO
chroot_list_file=/etc/vsftpd/vsftpd.chroot_list
background=YES
listen=YES
ls_recurse_enable=NO