debian-cis/bin/hardening/2.2.11_disable_imap_pop.sh

#!/bin/bash

# run-shellcheck
#
# CIS Debian Hardening
#

#
# 2.2.11 Ensure IMAP and POP server is not installed (Scored)
#

set -e # One error, it's over
set -u # One variable unset, it's over

# shellcheck disable=2034
HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Ensure IMAP and POP servers are not installed"
# shellcheck disable=2034
HARDENING_EXCEPTION=mail

# Based on aptitude search '~Pimap-server' and  aptitude search '~Ppop3-server'
PACKAGES='citadel-server courier-imap cyrus-imapd-2.4 dovecot-imapd mailutils-imap4d courier-pop cyrus-pop3d-2.4 dovecot-pop3d heimdal-servers mailutils-pop3d popa3d solid-pop3d xmail'

# This function will be called if the script status is on enabled / audit mode
audit () {
    for PACKAGE in $PACKAGES; do
        is_pkg_installed "$PACKAGE"
        if [ "$FNRET" = 0 ]; then
            crit "$PACKAGE is installed!"
        else
            ok "$PACKAGE is absent"
        fi
    done
}

# This function will be called if the script status is on enabled mode
apply () {
    for PACKAGE in $PACKAGES; do
        is_pkg_installed "$PACKAGE"
        if [ "$FNRET" = 0 ]; then
            crit "$PACKAGE is installed, purging it"
            apt-get purge "$PACKAGE" -y
            apt-get autoremove -y
        else
            ok "$PACKAGE is absent"
        fi
    done
}

# This function will check config parameters required
check_config() {
    :
}

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default
    . /etc/default/cis-hardening
fi
if [ -z "$CIS_ROOT_DIR" ]; then
     echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
     echo "Cannot source CIS_ROOT_DIR variable, aborting."
    exit 128
fi

# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
# shellcheck source=../../lib/main.sh
    . "$CIS_ROOT_DIR"/lib/main.sh
else
    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
    exit 128
fi