#!/bin/bash

#
# harbian-audit for Debian GNU/Linux 7/8/9/10 or CentOS Hardening
#

#
# 7.1.1 Disable IP Forwarding (Scored)
#

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

HARDENING_LEVEL=3
HARDENING_EXCEPTION=gw

SYSCTL_PARAM='net.ipv4.ip_forward'
SYSCTL_EXP_RESULT=0

# This function will be called if the script status is on enabled / audit mode
audit () {
    has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT
    if [ $FNRET != 0 ]; then
        if [ $ISEXCEPTION -eq 1 ]; then
            warn "$PACKAGE is installed! But Exception is set to 1, so it's pass!"
        else
            crit "$SYSCTL_PARAM was not set to $SYSCTL_EXP_RESULT"
        fi
    elif [ $FNRET = 255 ]; then
        warn "$SYSCTL_PARAM does not exist -- Typo?"
    else
        ok "$SYSCTL_PARAM correctly set to $SYSCTL_EXP_RESULT"
    fi
}

# This function will be called if the script status is on enabled mode
apply () {
    has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT
    if [ $FNRET != 0 ]; then
        if [ $ISEXCEPTION -eq 1 ]; then
            warn "$PACKAGE is installed! But the exception is set to true, so don't need any operate."
        else
            warn "$SYSCTL_PARAM was not set to $SYSCTL_EXP_RESULT -- Fixing"
            set_sysctl_param $SYSCTL_PARAM $SYSCTL_EXP_RESULT
            sysctl -w net.ipv4.route.flush=1 > /dev/null
        fi
    elif [ $FNRET = 255 ]; then
        warn "$SYSCTL_PARAM does not exist -- Typo?"
    else
        ok "$SYSCTL_PARAM correctly set to $SYSCTL_EXP_RESULT"
    fi
}

# This function will create the config file for this check with default values
create_config() {
cat <<EOF
status=disabled
# Put here exception to pass this case, if set is 1, don't need apply, let to pass.
ISEXCEPTION=0
EOF
}

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

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
    . /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
    . $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