Ensure mail transfer agent is configured for local-only mode

MittelStufe 1Automatisiertros

Beschreibung

Mail Transfer Agents (MTA), such as sendmail and Postfix, are used to listen for incoming mail and transfer the messages to the appropriate user or mail server. If the system is not intended to be a mail server, it is recommended that the MTA be configured to only process local mail. The audit requires nothing to listen on port 25 except 127.0.0.1 and ::1 (ss). Host-level control from the CIS ROS Melodic benchmark (Ubuntu 18.04 robot hosts); run as root.

So wird geprüft

Prüfmethode: Shell-Befehl

shell

command -v ss >/dev/null 2>&1 || exit 1
l=$(ss -Hlntu 2>/dev/null | awk '$5 ~ /:25$/ {print $5}' | grep -Ev '^(127\.0\.0\.1|\[::1\]|::1):25$')
[ -z "$l" ] && echo compliant || echo "MTA listening on: $(printf '%s ' $l)"

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Edit /etc/postfix/main.cf and add the following line to the RECEIVING MAIL section. If the line already exists, change it to look like the line below: inet_interfaces = loopback-only Restart postfix: # systemctl restart postfix

Eigenschaften

Betriebssysteme: Beliebig
Tags: rosros1melodicservices
Referenz: CIS ROS Melodic Benchmark v1.0.0 - 2.2.15 Ensure mail transfer agent is configured for local-only mode

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shell

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