debian-cis/bin/hardening/11.1_warning_banners.sh

#!/bin/bash

#
# CIS Debian 7 Hardening
#

#
# 11.1 Set Warning Banner for Standard Login Services (Scored)
#

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

PERMISSIONS='644'
USER='root'
GROUP='root'
FILES='/etc/motd /etc/issue /etc/issue.net'

# This function will be called if the script status is on enabled / audit mode
audit () {
    for FILE in $FILES; do
        has_file_correct_ownership $FILE $USER $GROUP
        if [ $FNRET = 0 ]; then
            ok "$FILE has correct ownership"
        else
            crit "$FILE is not $USER:$GROUP ownership set"
        fi
        has_file_correct_permissions $FILE $PERMISSIONS
        if [ $FNRET = 0 ]; then
            ok "$FILE has correct permissions"
        else
            crit "$FILE has not $PERMISSIONS permissions set"
        fi
    done
}

# This function will be called if the script status is on enabled mode
apply () {
    for FILE in $FILES; do
        does_file_exist $FILE
        if [ $FNRET != 0 ]; then
            info "$FILE does not exist"
            touch $FILE
        fi
        has_file_correct_ownership $FILE $USER $GROUP
        if [ $FNRET = 0 ]; then
            ok "$FILE has correct ownership"
        else
            warn "$FILE is not $USER:$GROUP ownership set"
            chown $USER:$GROUP $FILE
        fi
        has_file_correct_permissions $FILE $PERMISSIONS
        if [ $FNRET = 0 ]; then
            ok "$FILE has correct permissions"
        else
            info "fixing $FILE permissions to $PERMISSIONS"
            chmod 0$PERMISSIONS $FILE
        fi
    done
}

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

# Source Root Dir Parameter
if [ ! -r /etc/default/cis-hardening ]; then
    echo "There is no /etc/default/cis-hardening file, cannot source CIS_ROOT_DIR variable, aborting"
    exit 128
else
    . /etc/default/cis-hardening
    if [ -z ${CIS_ROOT_DIR:-} ]; then
        echo "No CIS_ROOT_DIR variable, aborting"
        exit 128
    fi
fi 

# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then
    . $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