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https://github.com/ovh/debian-cis.git
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c17d04ecc2
I added shellcheck prefixes to fix: * SC1091 (following sourced files) * SC2034 (unused variables)
90 lines
2.5 KiB
Bash
Executable File
90 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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# run-shellcheck
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#
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# CIS Debian Hardening
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#
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#
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# 1.5.2 Ensure XD/NX support is enabled (Not Scored)
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#
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set -e # One error, it's over
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set -u # One variable unset, it's over
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# shellcheck disable=2034
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HARDENING_LEVEL=2
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# shellcheck disable=2034
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DESCRIPTION="Enable NoExecute/ExecuteDisable to prevent buffer overflow attacks."
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PATTERN='NX[[:space:]]\(Execute[[:space:]]Disable\)[[:space:]]protection:[[:space:]]active'
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# Check if the NX bit is supported and noexec=off hasn't been asked
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nx_supported_and_enabled() {
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if grep -q ' nx ' /proc/cpuinfo; then
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# NX supported, but if noexec=off specified, it's not enabled
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if $SUDO_CMD grep -qi 'noexec=off' /proc/cmdline; then
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FNRET=1 # supported but disabled
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else
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FNRET=0 # supported and enabled
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fi
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else
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FNRET=1 # not supported
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fi
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}
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# This function will be called if the script status is on enabled / audit mode
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audit () {
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does_pattern_exist_in_dmesg $PATTERN
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if [ $FNRET != 0 ]; then
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nx_supported_and_enabled
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if [ $FNRET != 0 ]; then
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crit "$PATTERN is not present in dmesg and NX seems unsupported or disabled"
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else
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ok "NX is supported and enabled"
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fi
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else
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ok "$PATTERN is present in dmesg"
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply () {
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does_pattern_exist_in_dmesg $PATTERN
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if [ $FNRET != 0 ]; then
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nx_supported_and_enabled
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if [ $FNRET != 0 ]; then
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crit "$PATTERN is not present in dmesg and NX seems unsupported or disabled"
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else
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ok "NX is supported and enabled"
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fi
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else
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ok "$PATTERN is present in dmesg"
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then
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# shellcheck source=../../lib/main.sh
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. $CIS_ROOT_DIR/lib/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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