#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright (c) Michael Boelen, CISOfy, and many contributors.
#
# Website : https://cisofy.com
# Blog : https://linux-audit.com/
# GitHub : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
# Firewalls
#
#################################################################################
#
InsertSection "${SECTION_FIREWALLS}"
#
#################################################################################
#
IPTABLES_ACTIVE=0
IP6TABLES_ACTIVE=0
IPTABLES_INKERNEL_ACTIVE=0
IPTABLES_MODULE_ACTIVE=0
FIREWALL_ACTIVE=0
FIREWALL_EMPTY_RULESET=0
NFTABLES_ACTIVE=0
#
#################################################################################
#
# Test : FIRE-4502
# Description : Check iptables kernel module
Register --test-no FIRE-4502 --os Linux --weight L --network NO --category security --description "Check iptables kernel module"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=$(${LSMODBINARY} | ${AWKBINARY} '{ print $1 }' | ${GREPBINARY} "^ip*_tables")
if [ -n "${FIND}" ]; then
FIREWALL_ACTIVE=1
IPTABLES_ACTIVE=1
IPTABLES_MODULE_ACTIVE=1
Display --indent 2 --text "- Checking iptables kernel module" --result "${STATUS_FOUND}" --color GREEN
Report "firewall_software[]=iptables"
LogText "Result: Found iptables in loaded kernel modules"
for I in ${FIND}; do
if [ "${I}" = "ip6_tables" ]; then IP6TABLES_ACTIVE=1; Report "firewall_software[]=ip6tables"; fi
LogText "Found module: ${I}"
done
elif [ -f ${ROOTDIR}proc/net/ip_tables_names ]; then
FIREWALL_ACTIVE=1
Report "firewall_software[]=iptables"
IPTABLES_ACTIVE=1
Display --indent 2 --text "- Checking iptables support" --result "${STATUS_FOUND}" --color GREEN
elif [ -f ${ROOTDIR}proc/net/ip6_tables_names ]; then
FIREWALL_ACTIVE=1
IP6TABLES_ACTIVE=1
Report "firewall_software[]=ip6tables"
Display --indent 2 --text "- Checking ip6tables support" --result "${STATUS_FOUND}" --color GREEN
else
Display --indent 2 --text "- Checking iptables kernel module" --result "${STATUS_NOT_FOUND}" --color WHITE
# If we can't find an active module, try to find the Linux configuration file and check that
if [ -f /proc/config.gz ]; then LINUXCONFIGFILE="/proc/config.gz"; tCATCMD="zcat"; fi
sLINUXCONFIGFILE="/boot/config-$(uname -r)"
if [ -f ${sLINUXCONFIGFILE} ]; then LINUXCONFIGFILE=${sLINUXCONFIGFILE}; tCATCMD="cat"; fi
# If we have a kernel configuration file, use it for testing
# Do not perform test if we already found it in kernel module list, to avoid triggered it in the upcoming
# tests, when using iptables --list
if [ -n "${LINUXCONFIGFILE}" ]; then
if [ -f ${LINUXCONFIGFILE} -a ${IPTABLES_MODULE_ACTIVE} -eq 0 ]; then
LogText "Result: found kernel configuration file (${LINUXCONFIGFILE})"
FIND=$(${tCATCMD} ${LINUXCONFIGFILE} | ${GREPBINARY} -v '^#' | ${GREPBINARY} "CONFIG_IP_NF_IPTABLES" | head -n 1)
if [ -n "${FIND}" ]; then
HAVEMOD=$(echo ${FIND} | ${CUTBINARY} -d '=' -f2)
# Do not use iptables if it's compiled as a module (=m), since we already tested for it in the
# active list.
if [ "${HAVEMOD}" = "y" ]; then
LogText "Result: iptables available as a module in the configuration"
IPTABLES_ACTIVE=1
IPTABLES_INKERNEL_ACTIVE=1
FIREWALL_ACTIVE=1
Display --indent 2 --text "- Checking iptables in config file" --result "${STATUS_FOUND}" --color GREEN
else
LogText "Result: no iptables found in Linux kernel config file"
fi
else
LogText "Result: no Linux configuration file found"
Display --indent 2 --text "- Checking iptables in config file" --result "${STATUS_NOT_FOUND}" --color WHITE
fi
fi
fi
fi
fi
#
#################################################################################
#
# Test : FIRE-4508
# Description : Check iptables chain policies
# Notes : Suggestions are currently disabled, until related page and documentation is available
# TODO : grep -z is not supported on BusyBox
if [ ! "${IPTABLESBINARY}" = "" -a ${IPTABLES_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4508 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --root-only YES --category security --description "Check used policies of iptables chains"
if [ ${SKIPTEST} -eq 0 ]; then
Display --indent 4 --text "- Checking iptables policies of chains" --result "${STATUS_FOUND}" --color GREEN
IPTABLES_TABLES="filter nat mangle raw security"
for IPTABLES_TABLE in ${IPTABLES_TABLES}
do
${IPTABLESBINARY} -t "${IPTABLES_TABLE}" --list-rules --wait 1 2>/dev/zero |
{
IPTABLES_OUTPUT_QUEUE=""
while IFS="$(printf '\n')" read -r IPTABLES_LINES
do
set -- ${IPTABLES_LINES}
while [ $# -gt 0 ]; do
if [ "${1}" = "-P" ]; then
IPTABLES_CHAIN="${2}"
IPTABLES_TARGET="${3}"
shift 3
elif [ "${1}" = "-A" ] || [ "${1}" = "-N" ]; then
IPTABLES_CHAIN="${2}"
shift 2
elif [ "${1}" = "-j" ]; then
IPTABLES_TARGET="${2}"
shift
else
shift
fi
done
# logics
if [ "${IPTABLES_TABLE}" = "filter" ] || [ "${IPTABLES_TABLE}" = "security" ]; then
if [ "${IPTABLES_CHAIN}" = "INPUT" ]; then
if [ "${IPTABLES_TARGET}" = "ACCEPT" ]; then
IPTABLES_OUTPUT_QUEUE="${IPTABLES_OUTPUT_QUEUE}\n${IPTABLES_TABLE} ${IPTABLES_CHAIN} ${IPTABLES_TARGET} YELLOW 1 3"
elif [ "${IPTABLES_TARGET}" = "DROP" ]; then
IPTABLES_OUTPUT_QUEUE="${IPTABLES_OUTPUT_QUEUE}\n${IPTABLES_TABLE} ${IPTABLES_CHAIN} ${IPTABLES_TARGET} GREEN 3 3"
fi
fi
if [ "${IPTABLES_CHAIN}" = "INPUT" ] || [ "${IPTABLES_CHAIN}" = "FORWARD" ] || [ "${IPTABLES_CHAIN}" = "OUTPUT" ]; then
if [ "${IPTABLES_TARGET}" = "NFQUEUE" ]; then
IPTABLES_OUTPUT_QUEUE="${IPTABLES_OUTPUT_QUEUE}\n${IPTABLES_TABLE} ${IPTABLES_CHAIN} ${IPTABLES_TARGET} RED 0 3"
fi
fi
fi
done
if [ -n "${IPTABLES_OUTPUT_QUEUE}" ]; then
# Sort output if sort tool is available
if [ -n "${SORTBINARY}" ]; then
LogText "Info: sorting output"
IPTABLES_OUTPUT="$(printf '%b' "${IPTABLES_OUTPUT_QUEUE}" | ${SORTBINARY} -u )"
else
IPTABLES_OUTPUT="$(printf '%b' "${IPTABLES_OUTPUT_QUEUE}")"
fi
printf '%b\n' "${IPTABLES_OUTPUT}" | while IFS="$(printf '\n')" read -r IPTABLES_OUTPUT_LINE
do
if [ -n "$IPTABLES_OUTPUT_LINE" ]; then
set -- ${IPTABLES_OUTPUT_LINE}
while [ $# -gt 0 ]; do
LogText "Result: Found target '${3}' for chain '${2}' (table: ${1})"
Display --indent 6 --text "- Chain ${2} (table: ${1}, target: ${3})" --result "${3}" --color "${4}"
if [ "${3}" = "NFQUEUE" ]
then
ReportSuggestion "${TEST_NO}" "Consider avoid ${3} target if possible (iptables chain ${2}, table: ${1})"
fi
AddHP "${5}" "${6}"
shift 6
done
fi
done
fi
}
unset IPTABLES_TABLE
done
unset IPTABLES_TABLES
fi
unset PREQS_MET
#
#################################################################################
#
# Test : FIRE-4512
# Description : Check iptables for empty ruleset (should have at least 5 or more rules)
if [ -n "${IPTABLESBINARY}" -a ${IPTABLES_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4512 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --root-only YES --category security --description "Check iptables for empty ruleset"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=$(${IPTABLESBINARY} --list --numeric 2> /dev/null | ${GREPBINARY} -E -v "^(Chain|target|$)" | ${WCBINARY} -l | ${TRBINARY} -d ' ')
if [ -n "${FIND}" ]; then
FIREWALL_ACTIVE=1
if [ ${FIND} -le 5 ]; then
# Firewall is active, but needs configuration
FIREWALL_EMPTY_RULESET=1
LogText "Result: iptables ruleset seems to be empty (found ${FIND} rules)"
Display --indent 4 --text "- Checking for empty ruleset" --result "${STATUS_WARNING}" --color RED
ReportWarning "${TEST_NO}" "iptables module(s) loaded, but no rules active"
else
LogText "Result: one or more rules are available (${FIND} rules)"
Display --indent 4 --text "- Checking for empty ruleset" --result "${STATUS_OK}" --color GREEN
fi
fi
fi
#
#################################################################################
#
# Test : FIRE-4513
# Description : Check iptables for unused rules
if [ -n "${IPTABLESBINARY}" -a ${IPTABLES_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4513 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --root-only YES --category security --description "Check iptables for unused rules"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=$(${IPTABLESBINARY} --list --numeric --line-numbers --verbose | ${AWKBINARY} '{ if ($2=="0") print $1 }' | ${XARGSBINARY})
if IsEmpty "${FIND}"; then
Display --indent 4 --text "- Checking for unused rules" --result "${STATUS_OK}" --color GREEN
LogText "Result: There are no unused rules present"
else
Display --indent 4 --text "- Checking for unused rules" --result "${STATUS_FOUND}" --color YELLOW
LogText "Result: Found one or more possible unused rules"
LogText "Description: Unused rules can be a sign that the firewall rules aren't optimized or up-to-date"
LogText "Note: Sometimes rules aren't triggered but still in use. Keep this in mind before cleaning up rules."
LogText "Output: iptables rule numbers: ${FIND}"
ReportSuggestion "${TEST_NO}" "Check iptables rules to see which rules are currently not used"
LogText "Tip: iptables --list --numeric --line-numbers --verbose"
fi
fi
#
#################################################################################
#
# Test : FIRE-4514
# Notes :
# Check if ipv6 is active on any network interface
# If ip_tables is active, and ip6_tables is not, show warning about missing filtering
#
#################################################################################
#
# Test : FIRE-4518
# Description : Checking status of pf firewall components
# Notes : Use /dev/pf as first detection method if pf is available
if [ -e /dev/pf ]; then PREQS_MET="YES"; SKIPREASON=""; else PREQS_MET="NO"; SKIPREASON="No /dev/pf device"; fi
Register --test-no FIRE-4518 --preqs-met ${PREQS_MET} --skip-reason "${SKIPREASON}" --weight L --network NO --root-only YES --category security --description "Check pf firewall components"
if [ ${SKIPTEST} -eq 0 ]; then
PFFOUND=0; PFLOGDFOUND=0
# Check status with pfctl
LogText "Test: checking pf status via pfctl"
if [ -n "${PFCTLBINARY}" ]; then
FIND=$(${PFCTLBINARY} -sa 2>&1 | ${GREPBINARY} "^Status" | ${HEADBINARY} -1 | ${AWKBINARY} '{ print $2 }')
if [ "${FIND}" = "Disabled" ]; then
if IsVerbose; then Display --indent 2 --text "- Checking pf status (pfctl)" --result "${STATUS_DISABLED}" --color RED; fi
LogText "Result: pf is disabled"
AddHP 0 3
elif [ "${FIND}" = "Enabled" ]; then
Display --indent 2 --text "- Checking pf status (pfctl)" --result "${STATUS_ENABLED}" --color GREEN
LogText "Result: pf is enabled"
PFFOUND=1
AddHP 3 3
else
Display --indent 2 --text "- Checking pf status (pfctl)" --result "${STATUS_UNKNOWN}" --color YELLOW
ReportException ${TEST_NO} "Unknown status of pf firewall"
fi
fi
# If we didn't find the status to be enabled, stop searching
if [ ${PFFOUND} -eq 0 ]; then
# Check for pf kernel module (FreeBSD and similar)
LogText "Test: searching for pf kernel module"
if [ -n "${KLDSTATBINARY}" ]; then
FIND=$(${KLDSTATBINARY} | ${GREPBINARY} 'pf.ko')
if [ -z "${FIND}" ]; then
LogText "Result: Can not find pf KLD"
else
LogText "Result: pf KLD loaded"
PFFOUND=1
fi
else
LogText "Result: no kldstat binary, skipping this part"
fi
if IsRunning "pflogd"; then
LogText "Result: found pflog daemon in process list"
Display --indent 4 --text "- Checking pflogd status" --result "ACTIVE" --color GREEN
PFFOUND=1
PFLOGDFOUND=1
else
LogText "Result: pflog daemon not found in process list"
fi
fi
if [ ${PFFOUND} -eq 1 ]; then
FIREWALL_ACTIVE=1
Report "firewall_software[]=pf"
else
LogText "Result: pf not running on this system"
fi
fi
#
#################################################################################
#
# Test : FIRE-4520
# Description : Check pf configuration consistency
if [ ${PFFOUND} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4520 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check pf configuration consistency"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check /etc/pf.conf"
# Test for warnings (-n don't load the rules)
if [ -f /etc/pf.conf ]; then
LogText "Result: /etc/pf.conf exists"
# Check results from pfctl
PFWARNINGS=$(${PFCTLBINARY} -n -f /etc/pf.conf -vvv 2>&1 | ${GREPBINARY} -i 'warning')
if [ -z "${PFWARNINGS}" ]; then
Display --indent 4 --text "- Checking pf configuration consistency" --result "${STATUS_OK}" --color GREEN
LogText "Result: no pf filter warnings found"
else
Display --indent 4 --text "- Checking pf configuration consistency" --result "${STATUS_WARNING}" --color RED
LogText "Result: found one or more warnings in the pf filter rules"
ReportWarning "${TEST_NO}" "Found one or more warnings in pf configuration file" "/etc/pf.conf" "text:Run 'pfctl -n -f /etc/pf.conf -vvv' to see available pf warnings"
fi
else
LogText "Result: /etc/pf.conf does NOT exist"
fi
fi
#
#################################################################################
#
# Test : FIRE-4522
# Description : Check ipchains
#
#################################################################################
#
# Test : FIRE-4524
# Description : Check for CSF (ConfigServer Security & Firewall)
Register --test-no FIRE-4524 --weight L --network NO --category security --description "Check for CSF presence"
if [ ${SKIPTEST} -eq 0 ]; then
FILE="/etc/csf/csf.conf"
LogText "Test: check ${FILE}"
if [ -f ${FILE} ]; then
LogText "Result: ${FILE} exists"
FIREWALL_ACTIVE=1
Report "firewall_software[]=csf"
Display --indent 2 --text "- Checking CSF status (configuration file)" --result "${STATUS_FOUND}" --color GREEN
LogText "Test: check if CSF testing mode is disabled"
FIND=$(${GREPBINARY} -P "^TESTING(\s|=)" ${FILE} | ${CUTBINARY} -d= -f2 | ${XARGSBINARY})
if [ "${FIND}" = "0" ]; then
Display --indent 4 --text "- Check if CSF testing mode is disabled" --result "${STATUS_OK}" --color GREEN
else
Display --indent 4 --text "- Check if CSF testing mode is disabled" --result "${STATUS_WARNING}" --color RED
fi
LogText "Test: check if CSF is running"
if [ ! -f /etc/csf/csf.disable ]; then
Display --indent 4 --text "- Check if CSF is running" --result "${STATUS_OK}" --color GREEN
else
Display --indent 4 --text "- Check if CSF is running" --result "${STATUS_WARNING}" --color RED
fi
else
LogText "Result: ${FILE} does NOT exist"
fi
fi
#
#################################################################################
#
# Test : FIRE-4526
# Description : Check ipf (Solaris)
if [ ! "${IPFBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4526 --os Solaris --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check ipf status"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=$(${IPFBINARY} -n -V | ${GREPBINARY} "^Running" | ${AWKBINARY} '{ print $2 }')
if [ "${FIND}" = "yes" ]; then
Display --indent 4 --text "- Checking ipf status" --result "${STATUS_RUNNING}" --color GREEN
LogText "Result: ipf is enabled and running"
FIREWALL_ACTIVE=1
Report "firewall_software[]=ipf"
else
Display --indent 4 --text "- Checking ipf status" --result "${STATUS_NOT_RUNNING}" --color YELLOW
LogText "Result: ipf is not running"
fi
fi
#
#################################################################################
#
# Test : FIRE-4530
# Description : Check IPFW (FreeBSD)
Register --test-no FIRE-4530 --os FreeBSD --weight L --network NO --category security --description "Check IPFW status"
if [ ${SKIPTEST} -eq 0 ]; then
if [ -n "${SYSCTLBINARY}" ]; then
# For now, only check for IPv4.
FIND=$(${SYSCTLBINARY} net.inet.ip.fw.enable 2> /dev/null | ${AWKBINARY} '{ print $2 }')
if [ "${FIND}" = "1" ]; then
Display --indent 2 --text "- Checking IPFW status" --result "${STATUS_RUNNING}" --color GREEN
LogText "Result: IPFW is running for IPv4"
FIREWALL_ACTIVE=1
Report "firewall_software[]=ipfw"
IPFW_ENABLED=$(service -e | ${GREPBINARY} -o ipfw)
if [ "${IPFW_ENABLED}" = "ipfw" ]; then
Display --indent 4 --text "- IPFW enabled in /etc/rc.conf" --result "${STATUS_YES}" --color GREEN
LogText "Result: IPFW is enabled at start-up for IPv4"
else
Display --indent 4 --text "- ipfw enabled in /etc/rc.conf" --result "${STATUS_NO}" --color YELLOW
LogText "Result: IPFW is disabled at start-up for IPv4"
fi
else
if IsVerbose; then Display --indent 2 --text "- Checking IPFW status" --result "${STATUS_NOT_RUNNING}" --color YELLOW; fi
LogText "Result: IPFW is not running for IPv4"
fi
else
ReportException "${TEST_NO}:1" "No IPFW test available (sysctl missing)"
fi
fi
#
#################################################################################
#
# Test : FIRE-4532
# Description : Check Application Firewall in macOS
if [ -x /usr/libexec/ApplicationFirewall/socketfilterfw ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4532 --weight L --os "macOS" --preqs-met ${PREQS_MET} --network NO --category security --description "Check macOS application firewall"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=$(/usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate 2> /dev/null | ${GREPBINARY} "Firewall is enabled")
if [ -n "${FIND}" ]; then
Display --indent 2 --text "- Checking macOS: Application Firewall" --result "${STATUS_ENABLED}" --color GREEN
AddHP 3 3
LogText "Result: application firewall of macOS is enabled"
FIREWALL_ACTIVE=1
APPLICATION_FIREWALL_ACTIVE=1
Report "firewall_software[]=macosx-app-fw"
Report "app_fw[]=macosx-app-fw"
else
if IsVerbose; then Display --indent 2 --text "- Checking macOS: Application Firewall" --result "${STATUS_DISABLED}" --color YELLOW; fi
AddHP 1 3
LogText "Result: application firewall of macOS is disabled"
fi
fi
#
#################################################################################
#
# Test : FIRE-4534
# Description : Check outbound firewalls on macOS
Register --test-no FIRE-4534 --weight L --os "macOS" --network NO --category security --description "Check for presence of outbound firewalls on macOS"
if [ ${SKIPTEST} -eq 0 ]; then
FOUND=0
# Little Snitch Daemon (macOS)
LogText "Test: checking process Little Snitch Daemon"
if IsRunning --full "Little Snitch Daemon"; then
Display --indent 2 --text "- Checking Little Snitch Daemon" --result "${STATUS_ENABLED}" --color GREEN
LogText "Result: Little Snitch found"
FOUND=1
FIREWALL_ACTIVE=1
APPLICATION_FIREWALL_ACTIVE=1
Report "app_fw[]=little-snitch"
Report "firewall_software[]=little-snitch"
fi
# HandsOff! Daemon (macOS)
LogText "Test: checking process HandsOffDaemon"
if IsRunning "HandsOffDaemon"; then
Display --indent 2 --text "- Checking Hands Off! Daemon" --result "${STATUS_ENABLED}" --color GREEN
LogText "Result: Hands Off! found"
FOUND=1
FIREWALL_ACTIVE=1
APPLICATION_FIREWALL_ACTIVE=1
Report "app_fw[]=hands-off"
Report "firewall_software[]=hands-off"
fi
# LuLu Daemon (macOS)
LogText "Test: checking process LuLu"
if IsRunning "LuLu"; then
Display --indent 2 --text "- Checking LuLu Daemon" --result "${STATUS_ENABLED}" --color GREEN
LogText "Result: LuLu found"
FOUND=1
FIREWALL_ACTIVE=1
APPLICATION_FIREWALL_ACTIVE=1
Report "app_fw[]=lulu"
Report "firewall_software[]=lulu"
fi
# Radio Silence (macOS)
LogText "Test: checking process Radio Silence"
if IsRunning --full "Radio Silence"; then
Display --indent 2 --text "- Checking Radio Silence" --result "${STATUS_ENABLED}" --color GREEN
LogText "Result: Radio Silence found"
FOUND=1
FIREWALL_ACTIVE=1
APPLICATION_FIREWALL_ACTIVE=1
Report "app_fw[]=radio-silence"
Report "firewall_software[]=radio-silence"
fi
if [ ${FOUND} -eq 0 ]; then
LogText "Result: outbound firewall not found"
AddHP 1 3
else
LogText "Result: found one or more macOS outbound firewall"
AddHP 3 3
fi
fi
#
#################################################################################
#
# Test : FIRE-4536
# Description : Check nftables kernel module
if HasData "${NFTBINARY}"; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4536 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check nftables status"
if [ ${SKIPTEST} -eq 0 ]; then
FIND=$(${LSMODBINARY} | ${AWKBINARY} '{ print $1 }' | ${GREPBINARY} "^nf*_tables")
if [ -n "${FIND}" ]; then
LogText "Result: found nftables kernel module"
FIREWALL_ACTIVE=1
NFTABLES_ACTIVE=1
Report "firewall_software[]=nftables"
else
LogText "Result: no nftables kernel module found"
fi
fi
#
#################################################################################
#
# Test : FIRE-4538
# Description : Check nftables configuration
if HasData "${NFTBINARY}"; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4538 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check nftables basic configuration"
if [ ${SKIPTEST} -eq 0 ]; then
# Retrieve nft version
NFT_VERSION=$(${NFTBINARY} --version 2> /dev/null | ${AWKBINARY} '{ if ($1=="nftables") { print $2 }}' | ${TRBINARY} -d 'v')
Report "nft_version=${NFT_VERSION}"
LogText "Result: found version ${NFT_VERSION} of nft"
fi
#
#################################################################################
#
# Test : FIRE-4540
# Description : Check nftables configuration
if HasData "${NFTBINARY}"; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4540 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --root-only YES --category security --description "Check for empty nftables configuration"
if [ ${SKIPTEST} -eq 0 ]; then
# Check for empty ruleset
NFT_RULES_LENGTH=$(${NFTBINARY} --stateless list ruleset 2> /dev/null | ${GREPBINARY} -E -v "table|chain|;$|}$|^$" | ${WCBINARY} -l)
if [ ${NFT_RULES_LENGTH} -le 3 ]; then
FIREWALL_EMPTY_RULESET=1
LogText "Result: this firewall set has 3 rules or less and is considered to be empty"
else
LogText "Result: found ${NFT_RULES_LENGTH} rules in nftables configuration"
fi
fi
#
#################################################################################
#
# Test : FIRE-4586
# Description : Check firewall logging
if [ ${FIREWALL_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no FIRE-4586 --preqs-met ${PREQS_MET} --weight L --network NO --root-only YES --category security --description "Check firewall logging"
if [ ${SKIPTEST} -eq 0 ]; then
if [ ${IPTABLES_ACTIVE} -eq 1 ]; then
if [ -n "${IPTABLESSAVEBINARY}" ]; then
HAS_LOGGING=$(${IPTABLESSAVEBINARY} | ${GREPBINARY} "\-j LOG")
if [ -z "${HAS_LOGGING}" ]; then
Report "firewall_no_logging[]=iptables"
fi
fi
fi
fi
#
#################################################################################
#
# Test : FIRE-4590
# Description : Check if at least one firewall if active
Register --test-no FIRE-4590 --weight L --network NO --category security --description "Check firewall status"
if [ ${SKIPTEST} -eq 0 ]; then
if [ ${FIREWALL_ACTIVE} -eq 1 ]; then
Display --indent 2 --text "- Checking host based firewall" --result "${STATUS_ACTIVE}" --color GREEN
LogText "Result: host based firewall or packet filter is active"
Report "manual[]=Verify if there is a formal process for testing and applying firewall rules"
Report "manual[]=Verify all traffic is filtered the right way between the different security zones"
Report "manual[]=Verify if a list is available with all required services"
# YYY Solaris ipf (determine default policy)
Report "manual[]=Make sure an explicit deny all is the default policy for all unmatched traffic"
AddHP 5 5
else
Display --indent 2 --text "- Checking host based firewall" --result "${STATUS_NOT_ACTIVE}" --color YELLOW
LogText "Result: no host based firewall/packet filter found or configured"
ReportSuggestion "${TEST_NO}" "Configure a firewall/packet filter to filter incoming and outgoing traffic"
AddHP 0 5
fi
fi
#
#################################################################################
#
# Test : FIRE-4594
# Description : Check for APF (Advanced Policy Firewall)
Register --test-no FIRE-4594 --weight L --network NO --category security --description "Check for APF presence"
if [ -n "${IPTABLESBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
if [ ${SKIPTEST} -eq 0 ]; then
FILE="/etc/apf/conf.apf"
LogText "Test: check ${FILE}"
if [ -f ${FILE} ]; then
LogText "Result: ${FILE} exists"
FIREWALL_ACTIVE=1
Report "firewall_software[]=apf"
Display --indent 2 --text "- Checking APF status (configuration file)" --result "${STATUS_FOUND}" --color GREEN
LogText "Test: check if APF testing mode is disabled"
FIND=$(${GREPBINARY} -P "^DEVEL_MODE(\s|=)" ${FILE} | ${CUTBINARY} -d= -f2 | ${XARGSBINARY})
if [ "${FIND}" = "0" ]; then
Display --indent 4 --text "- Check if APF testing mode is disabled" --result "${STATUS_OK}" --color GREEN
else
Display --indent 4 --text "- Check if APF testing mode is disabled" --result "${STATUS_WARNING}" --color RED
fi
LogText "Test: check if APF is running"
FIND=$(${IPTABLESBINARY} -L -n | ${GREPBINARY} -iom1 sanity | ${WCBINARY} -l)
if [ "${FIND}" = "1" ]; then
Display --indent 4 --text "- Check if APF is running" --result "${STATUS_OK}" --color GREEN
else
Display --indent 4 --text "- Check if APF is running" --result "${STATUS_WARNING}" --color RED
fi
else
LogText "Result: ${FILE} does NOT exist"
fi
fi
#
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#
WaitForKeyPress
#
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#
# TODO
# Suggestion to disable iptables if nftables is enabled
# Check for specific features in nftables releases
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
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