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lynis/include/tests_firewalls
chr0mag 06bf77cb30 [FIRE-4540] Modify test to better measure rules (#636) 
This test was previously measuring the number of bytes (wc -c)
in the exported JSON which is likely not what was intended and
will lead to false positives anytime the number of bytes exceeds
16.

The export feature is poorly documented and requires the jansson
package on the target system to export as JSON - which may not
always be the case.

Lastly, 16 is an arbitrary and uncessarily high number. A simple
workstation firewall can have only 3 rules and be effective.

This commit makes use of 'nft list ruleset' instead of the export
command, strips out blank lines as well as table & chain headers
before measuring the number of lines in the output. Any result
with more than 3 rules is now considered non-empty. This is more
consistent with the equivalent iptables test case.
2019-03-05 18:57:58 +01:00

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#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2019, CISOfy
#
# Website : https://cisofy.com
# Blog : http://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 "Software: 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 }' | ${GREPBINARY} "^ip*_tables")
if [ ! -z "${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 [ ! -z "${LINUXCONFIGFILE}" ]; then
if [ -f ${LINUXCONFIGFILE} -a ${IPTABLES_MODULE_ACTIVE} -eq 0 ]; then
LogText "Result: found kernel configuration file (${LINUXCONFIGFILE})"
FIND=$(${tCATCMD} ${LINUXCONFIGFILE} | ${GREPBINARY} -v '^#' | ${GREPBINARY} "CONFIG_IP_NF_IPTABLES" | head -n 1)
if [ ! -z "${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
TABLES="filter"
for TABLE in ${TABLES}; do
LogText "Test: gathering information from table ${TABLE}"
FIND="$FIND""\n"$(${IPTABLESBINARY} -t ${TABLE} --numeric --list | ${EGREPBINARY} -z -o -w '[A-Z]+' | tr -d '\0' | ${AWKBINARY} -v t=${TABLE} 'NR%2 {printf "%s %s ",t, $0 ; next;}1')
done
echo "${FIND}" | while read line; do
table=$(echo ${line} | ${AWKBINARY} '{ print $1 }')
chainname=$(echo ${line} | ${AWKBINARY} '{ print $2 }')
policy=$(echo ${line} | ${AWKBINARY} '{ print $3 }')
LogText "Result: iptables ${table} -- ${chainname} policy is ${policy}."
LogText "Result: ${policy}"
if [ "${TABLE}" = "filter" ]; then
if [ "${chainname}" = "INPUT" ]; then
case ${policy} in
"ACCEPT")
LogText "Result: Found ACCEPT for ${chainname} (table: ${table})"
Display --indent 6 --text "- Checking chain ${chainname} (table: ${table}, policy ${policy})" --result "ACCEPT" --color YELLOW
#ReportSuggestion ${TEST_NO} "Consider settings default chain policy to DROP (iptables chain ${chainname}, table: ${table})"
AddHP 1 3
;;
"DROP")
LogText "Result: Found DROP for ${chainname} (table: ${table})"
Display --indent 6 --text "- Checking chain ${chainname} (table: ${table}, policy ${policy})" --result "DROP" --color GREEN
AddHP 3 3
;;
*)
Display --indent 6 --text "- Checking chain ${chainname} (table: ${table}, policy ${policy})" --result "other" --color YELLOW
LogText "Result: Unknown policy: ${policy}"
#ReportSuggestion ${TEST_NO} "Check iptables ${chainname} (table: ${table}) chain policy"
;;
esac
fi
fi
done
fi
#
#################################################################################
#
# Test : FIRE-4512
# Description : Check iptables for empty ruleset (should have at least 5 or more rules)
if [ ! -z "${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 | ${EGREPBINARY} -v "^(Chain|target|$)" | ${WCBINARY} -l | ${TRBINARY} -d ' ')
if [ ! -z "${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 "${STATUS_OK}" --color GREEN
fi
fi
fi
#
#################################################################################
#
# Test : FIRE-4513
# Description : Check iptables for unused rules
if [ ! -z "${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 [ ${SKIPTEST} -eq 0 ]; then
PFFOUND=0; PFLOGDFOUND=0
# Check status with pfctl
LogText "Test: checking pf status via pfctl"
if [ ! -z "${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 [ ${PFFOUND} -eq 0 ]; then
# Check for pf kernel module (FreeBSD and similar)
LogText "Test: searching for pf kernel module"
if [ ! -z "${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
IsRunning pflogd
if [ ${RUNNING} -eq 1 ]; 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 [ ${SKIPTEST} -eq 0 ]; then
if [ ! -z "${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 | ${GREPBINARY} "Firewall is enabled")
if [ ! -z "${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
# Little Snitch Daemon (macOS)
LogText "Test: checking process Little Snitch Daemon"
IsRunning --full "Little Snitch Daemon"
if [ ${RUNNING} -eq 1 ]; then
Display --indent 2 --text "- Checking Little Snitch Daemon" --result "${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"
IsRunning HandsOffDaemon
if [ ${RUNNING} -eq 1 ]; then
Display --indent 2 --text "- Checking Hands Off! Daemon" --result "${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"
IsRunning LuLu
if [ ${RUNNING} -eq 1 ]; then
Display --indent 2 --text "- Checking LuLu Daemon" --result "${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"
IsRunning --full "Radio Silence"
if [ ${RUNNING} -eq 1 ]; then
Display --indent 2 --text "- Checking Radio Silence" --result "${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 }' | ${GREPBINARY} "^nf*_tables")
if [ ! -z "${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} list ruleset --stateless 2> /dev/null | ${EGREPBINARY} -v "table|chain|;$|}$|^$" | ${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 [ ${IPTABLES_ACTIVE} -eq 1 ]; then
if [ ! -z "${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 "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 "NOT ACTIVE" --color YELLOW
LogText "Result: no host based firewall/packet filter found or configured"
ReportSuggestion ${TEST_NO} "Configure a firewall/packet filter to filter incoming and outgoing traffic"
AddHP 0 5
fi
fi
#
#################################################################################
#
# Test : FIRE-4594
# Description : Check for APF (Advanced Policy Firewall)
Register --test-no FIRE-4594 --weight L --network NO --category security --description "Check for APF presence"
if [ ! -z "${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: ${FILE} does NOT exist"
fi
fi
#
#################################################################################
#
# Report firewall installed for now, if we found one active. Next step would be determining binaries first and apply additional checks.
Report "firewall_active=${FIREWALL_ACTIVE}"
Report "firewall_empty_ruleset=${FIREWALL_EMPTY_RULESET}"
Report "firewall_installed=${FIREWALL_ACTIVE}"
WaitForKeyPress
#
#################################################################################
#
# 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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