mirror of
https://github.com/ovh/debian-cis.git
synced 2024-11-22 13:37:02 +01:00
32886d3a3d
* Replace CIS_ROOT_DIR by a more flexible system * Try to adapt the logic change to the functional tests
98 lines
2.8 KiB
Bash
Executable File
98 lines
2.8 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# run-shellcheck
|
|
#
|
|
# CIS Debian Hardening
|
|
#
|
|
|
|
#
|
|
# 1.6.1 Ensure XD/NX support is enabled (Not 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 NoExecute/ExecuteDisable to prevent buffer overflow attacks."
|
|
|
|
PATTERN='NX[[:space:]]\(Execute[[:space:]]Disable\)[[:space:]]protection:[[:space:]]active'
|
|
|
|
# Check if the NX bit is supported and noexec=off hasn't been asked
|
|
nx_supported_and_enabled() {
|
|
if grep -q ' nx ' /proc/cpuinfo; then
|
|
# NX supported, but if noexec=off specified, it's not enabled
|
|
if $SUDO_CMD grep -qi 'noexec=off' /proc/cmdline; then
|
|
FNRET=1 # supported but disabled
|
|
else
|
|
FNRET=0 # supported and enabled
|
|
fi
|
|
else
|
|
FNRET=1 # not supported
|
|
fi
|
|
}
|
|
|
|
# This function will be called if the script status is on enabled / audit mode
|
|
audit() {
|
|
if [ "$IS_CONTAINER" -eq 1 ]; then
|
|
ok "Container detected, cannot read dmesg!"
|
|
else
|
|
does_pattern_exist_in_dmesg "$PATTERN"
|
|
if [ "$FNRET" != 0 ]; then
|
|
nx_supported_and_enabled
|
|
if [ "$FNRET" != 0 ]; then
|
|
crit "$PATTERN is not present in dmesg and NX seems unsupported or disabled"
|
|
else
|
|
ok "NX is supported and enabled"
|
|
fi
|
|
else
|
|
ok "$PATTERN is present in dmesg"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
# This function will be called if the script status is on enabled mode
|
|
apply() {
|
|
if [ "$IS_CONTAINER" -eq 1 ]; then
|
|
ok "Container detected, cannot read dmesg!"
|
|
else
|
|
does_pattern_exist_in_dmesg "$PATTERN"
|
|
if [ "$FNRET" != 0 ]; then
|
|
nx_supported_and_enabled
|
|
if [ "$FNRET" != 0 ]; then
|
|
crit "$PATTERN is not present in dmesg and NX seems unsupported or disabled"
|
|
else
|
|
ok "NX is supported and enabled"
|
|
fi
|
|
else
|
|
ok "$PATTERN is present in dmesg"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
# This function will check config parameters required
|
|
check_config() {
|
|
:
|
|
}
|
|
|
|
# Source Root Dir Parameter
|
|
if [ -r /etc/default/cis-hardening ]; then
|
|
# shellcheck source=../../debian/default
|
|
. /etc/default/cis-hardening
|
|
fi
|
|
if [ -z "$CIS_LIB_DIR" ]; then
|
|
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
|
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
|
exit 128
|
|
fi
|
|
|
|
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
|
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
|
# shellcheck source=../../lib/main.sh
|
|
. "${CIS_LIB_DIR}"/main.sh
|
|
else
|
|
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
|
exit 128
|
|
fi
|