diff --git a/bin/hardening/3.2.6_enable_bad_error_message_protection.sh b/bin/hardening/3.2.6_enable_bad_error_message_protection.sh new file mode 100755 index 0000000..0be1c5f --- /dev/null +++ b/bin/hardening/3.2.6_enable_bad_error_message_protection.sh @@ -0,0 +1,76 @@ +#!/bin/bash + +# +# CIS Debian Hardening +# + +# +# 3.2.6 Ensure bogus ICMP responses are ignored (Scored) +# + +set -e # One error, it's over +set -u # One variable unset, it's over + +HARDENING_LEVEL=2 +DESCRIPTION="Enable bad error message protection to prevent logfiles fillup." + +SYSCTL_PARAMS='net.ipv4.icmp_ignore_bogus_error_responses=1' + +# This function will be called if the script status is on enabled / audit mode +audit () { + for SYSCTL_VALUES in $SYSCTL_PARAMS; do + SYSCTL_PARAM=$(echo $SYSCTL_VALUES | cut -d= -f 1) + SYSCTL_EXP_RESULT=$(echo $SYSCTL_VALUES | cut -d= -f 2) + debug "$SYSCTL_PARAM should be set to $SYSCTL_EXP_RESULT" + has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT + if [ $FNRET != 0 ]; then + crit "$SYSCTL_PARAM was not set to $SYSCTL_EXP_RESULT" + elif [ $FNRET = 255 ]; then + warn "$SYSCTL_PARAM does not exist -- Typo?" + else + ok "$SYSCTL_PARAM correctly set to $SYSCTL_EXP_RESULT" + fi + done +} + +# This function will be called if the script status is on enabled mode +apply () { + for SYSCTL_VALUES in $SYSCTL_PARAMS; do + SYSCTL_PARAM=$(echo $SYSCTL_VALUES | cut -d= -f 1) + SYSCTL_EXP_RESULT=$(echo $SYSCTL_VALUES | cut -d= -f 2) + debug "$SYSCTL_PARAM should be set to $SYSCTL_EXP_RESULT" + has_sysctl_param_expected_result $SYSCTL_PARAM $SYSCTL_EXP_RESULT + if [ $FNRET != 0 ]; then + warn "$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 + elif [ $FNRET = 255 ]; then + warn "$SYSCTL_PARAM does not exist -- Typo?" + else + ok "$SYSCTL_PARAM correctly set to $SYSCTL_EXP_RESULT" + fi + done +} + +# This function will check config parameters required +check_config() { + : +} + +# Source Root Dir Parameter +if [ -r /etc/default/cis-hardening ]; then + . /etc/default/cis-hardening +fi +if [ -z "$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 $CIS_ROOT_DIR in /etc/default/cis-hardening" + exit 128 +fi \ No newline at end of file diff --git a/tests/hardening/3.2.6_enable_bad_error_message_protection.sh b/tests/hardening/3.2.6_enable_bad_error_message_protection.sh new file mode 100755 index 0000000..b333419 --- /dev/null +++ b/tests/hardening/3.2.6_enable_bad_error_message_protection.sh @@ -0,0 +1,10 @@ +# run-shellcheck +test_audit() { + describe Running on blank host + register_test retvalshouldbe 0 + dismiss_count_for_test + # shellcheck disable=2154 + run blank /opt/debian-cis/bin/hardening/"${script}".sh --audit-all + + # TODO fill comprehensive tests +}