mirror of
https://github.com/ovh/debian-cis.git
synced 2024-11-25 15:01:22 +01:00
82 lines
2.7 KiB
Bash
Executable File
82 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# run-shellcheck
|
|
#
|
|
# CIS Debian Hardening
|
|
#
|
|
|
|
#
|
|
# 3.2.8 Ensure TCP SYN Cookies is enabled (Scored)
|
|
#
|
|
|
|
set -e # One error, it's over
|
|
set -u # One variable unset, it's over
|
|
|
|
# shellcheck disable=2034
|
|
HARDENING_LEVEL=2
|
|
# shellcheck disable=2034
|
|
DESCRIPTION="Enable TCP-SYN cookie to prevent TCP-SYN flood attack."
|
|
|
|
SYSCTL_PARAMS='net.ipv4.tcp_syncookies=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 $SYSCTL_EXP_RESULT"
|
|
fi
|
|
done
|
|
}
|
|
|
|
# This function will check config parameters required
|
|
check_config() {
|
|
:
|
|
}
|
|
|
|
# Source Root Dir Parameter
|
|
if [ -r /etc/default/cis-hardening ]; then
|
|
# shellcheck source=../../debian/default
|
|
. /etc/default/cis-hardening
|
|
fi
|
|
if [ -z "$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
|