Restrict FTP Use

So wird geprüft

Prüfmethode: Shell-Befehl

command -v logins >/dev/null 2>&1 || exit 1; out=$( { for user in $(logins -s | awk '{ print $1 }') aiuser noaccess nobody nobody4; do grep -w "$user" /etc/ftpd/ftpusers >/dev/null 2>&1 || echo "User $user not in /etc/ftpd/ftpusers."; done ; } 2>/dev/null ); [ -z "$out" ] && echo compliant || printf '%s\n' "$out" | head -n 20

Erwartete Ausgabe

compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Perform the following to implement the recommended state: # cd /etc/ftpd # cp ftpusers ftpusers.orig # for user in `logins -s | awk '{ print $1 }'` aiuser noaccess nobody nobody4; do $(echo $user >> ftpusers) done # sort -u ftpusers > ftpusers.CIS # mv ftpusers.CIS ftpusers If your site policy states that users have to be authorized to use FTP, consider placing all users in the /etc/ftpd/ftpusers file and then explicitly removing those who are permitted to use the service. To accomplish this, use the command: # getent passwd | cut -f1 -d":" > /etc/ftpd/ftpusers This prohibits any user on the system from using ftp unless they are explicitly removed from the file. Note that this file will need to be updated as users are added to or removed from the system.

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