mirror of https://github.com/CISOfy/lynis.git
316 lines
15 KiB
Bash
316 lines
15 KiB
Bash
#!/bin/sh
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#################################################################################
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#
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# Lynis
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# ------------------
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#
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# Copyright 2007-2015, Michael Boelen (michael@rootkit.nl), The Netherlands
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# Web site: http://www.rootkit.nl
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#
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# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
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# welcome to redistribute it under the terms of the GNU General Public License.
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# See LICENSE file for usage of this software.
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#
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#################################################################################
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#
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# Firewalls
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#
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#################################################################################
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#
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InsertSection "Software: firewalls"
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#
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#################################################################################
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#
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IPTABLES_ACTIVE=0
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IPTABLES_INKERNEL_ACTIVE=0
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IPTABLES_MODULE_ACTIVE=0
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FIREWALL_ACTIVE=0
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FIREWALL_SOFTWARE=""
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#
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#################################################################################
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#
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# YYY Improvement needed for iptables to check if kernel modules are used or not.
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# If they are not used and iptables is not found in configuration, no checks should be performed.
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#
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# Test : FIRE-4511
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# Description : Check iptables kernel module
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Register --test-no FIRE-4511 --os Linux --weight L --network NO --description "Check iptables kernel module"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=`lsmod | awk '{ print $1 }' | grep "^ip*_tables"`
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if [ ! "${FIND}" = "" ]; then
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FIREWALL_ACTIVE=1
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FIREWALL_SOFTWARE="iptables"
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IPTABLES_ACTIVE=1
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IPTABLES_MODULE_ACTIVE=1
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Display --indent 2 --text "- Checking iptables kernel module" --result FOUND --color GREEN
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logtext "Result: Found iptables in loaded kernel modules"
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for I in ${FIND}; do
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logtext "Found module: ${I}"
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done
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else
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Display --indent 2 --text "- Checking iptables kernel module" --result "NOT FOUND" --color WHITE
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# If we can't find an active module, try to find the Linux configuration file and check that
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if [ -f /proc/config.gz ]; then
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LINUXCONFIGFILE="/proc/config.gz"; tCATCMD="zcat";
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fi
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sLINUXCONFIGFILE="/boot/config-`uname -r`"
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if [ -f ${sLINUXCONFIGFILE} ]; then
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LINUXCONFIGFILE=${sLINUXCONFIGFILE}; tCATCMD="cat";
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fi
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# If we have a kernel configuration file, use it for testing
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# Do not perform test if we already found it in kernel module list, to avoid triggered it in the upcoming
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# tests, when using iptables --list
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if [ ! "${LINUXCONFIGFILE}" = "" ]; then
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if [ -f ${LINUXCONFIGFILE} -a ${IPTABLES_MODULE_ACTIVE} -eq 0 ]; then
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logtext "Result: found kernel configuration file (${LINUXCONFIGFILE})"
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FIND=`${tCATCMD} ${LINUXCONFIGFILE} | grep -v '^#' | grep "CONFIG_IP_NF_IPTABLES" | head -n 1`
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if [ ! "${FIND}" = "" ]; then
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HAVEMOD=`echo ${FIND} | cut -d '=' -f2`
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# Do not use iptables if it's compiled as a module (=m), since we already tested for it in the
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# active list.
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if [ "${HAVEMOD}" = "y" ]; then
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logtext "Result: iptables available as a module in the configuration"
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IPTABLES_ACTIVE=1
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IPTABLES_INKERNEL_ACTIVE=1
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FIREWALL_ACTIVE=1
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FIREWALL_SOFTWARE="iptables"
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Display --indent 2 --text "- Checking iptables in config file" --result FOUND --color GREEN
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else
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logtext "Result: no iptables found in Linux kernel config file"
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fi
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else
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logtext "Result: no Linux configuration file found"
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Display --indent 2 --text "- Checking iptables in config file" --result "NOT FOUND" --color WHITE
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fi
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fi
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fi
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4512
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# Description : Check iptables for empty ruleset
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if [ ! "${IPTABLESBINARY}" = "" -a ${IPTABLES_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FIRE-4512 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --root-only YES --description "Check iptables for empty ruleset"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=`${IPTABLESBINARY} --list --numeric | egrep -v "^(Chain|target|$)" | wc -l | tr -d ' '`
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if [ "${FIND}" = "0" ]; then
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# Firewall is active, but clearly needs configuration
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FIREWALL_ACTIVE=1
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logtext "Result: iptables ruleset is empty"
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Display --indent 4 --text "- Checking for empty ruleset" --result WARNING --color RED
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ReportWarning ${TEST_NO} "L" "iptables module(s) loaded, but no rules active"
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ReportSuggestion ${TEST_NO} "Disable iptables kernel module if not used or make sure rules are being used"
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else
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logtext "Result: one or more rules are available"
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Display --indent 4 --text "- Checking for empty ruleset" --result OK --color GREEN
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4513
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# Description : Check iptables for unused rules
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if [ ! "${IPTABLESBINARY}" = "" -a ${IPTABLES_ACTIVE} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FIRE-4513 --preqs-met ${PREQS_MET} --os Linux --weight L --network NO --root-only YES --description "Check iptables for unused rules"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=`${IPTABLESBINARY} --list --numeric --line-numbers --verbose | awk '{ if ($2=="0") print $1 }' | xargs`
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if [ "${FIND}" = "" ]; then
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Display --indent 4 --text "- Checking for unused rules" --result OK --color GREEN
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logtext "Result: There are no unused rules present"
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else
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Display --indent 4 --text "- Checking for unused rules" --result WARNING --color YELLOW
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logtext "Result: Found one or more possible unused rules"
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logtext "Description: Unused rules can be a sign that the firewall rules aren't optimized or up-to-date"
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logtext "Note: Sometimes rules aren't triggered but still in use. Keep this in mind before cleaning up rules."
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logtext "Output: iptables rule numbers: ${FIND}"
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#ReportWarning ${TEST_NO} "L" "Found possible unused iptables rules ($FIND)"
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ReportSuggestion ${TEST_NO} "Check iptables rules to see which rules are currently not used"
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logtext "Tip: iptables --list --numeric --line-numbers --verbose"
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4518
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# Description : Checking status of pf firewall components
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Register --test-no FIRE-4518 --weight L --network NO --description "Check pf firewall components"
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if [ ${SKIPTEST} -eq 0 ]; then
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PFFOUND=0; PFLOGDFOUND=0
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# Check status with pfctl
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logtext "Test: checking pf status via pfctl"
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if [ ! "${PFCTLBINARY}" = "" ]; then
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FIND=`${PFCTLBINARY} -sa 2>&1 | grep "^Status" | head -1 | awk '{ print $2 }'`
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if [ "${FIND}" = "Enabled" ]; then
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Display --indent 2 --text "- Checking pf status (pfctl)" --result ENABLED --color GREEN
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logtext "Result: pf is enabled"
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PFFOUND=1
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AddHP 3 3
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else
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if [ "${FIND}" = "Disabled" ]; then
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Display --indent 2 --text "- Checking pf status (pfctl)" --result DISABLED --color RED
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logtext "Result: pf is disabled"
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AddHP 0 3
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else
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Display --indent 2 --text "- Checking pf status (pfctl)" --result UNKNOWN --color YELLOW
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ReportException ${TEST_NO} "Unknown status of pf firewall"
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fi
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fi
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fi
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# If we didn't find the status to be enabled, stop searching
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if [ ${PFFOUND} -eq 0 ]; then
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# Check for pf kernel module (FreeBSD and similar)
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logtext "Test: searching for pf kernel module"
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if [ ! "${KLDSTATBINARY}" = "" ]; then
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FIND=`${KLDSTATBINARY} | grep 'pf.ko'`
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if [ "${FIND}" = "" ]; then
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logtext "Result: Can not find pf KLD"
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else
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logtext "Result: pf KLD loaded"
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PFFOUND=1
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fi
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else
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logtext "Result: no kldstat binary, skipping this part"
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fi
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IsRunning pflogd
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if [ ${RUNNING} -eq 1 ]; then
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logtext "Result: found pflog daemon in process list"
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Display --indent 4 --text "- Checking pflogd status" --result ACTIVE --color GREEN
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PFFOUND=1
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PFLOGDFOUND=1
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else
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logtext "Result: pflog daemon not found in process list"
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Display --indent 4 --text "- Checking pflogd status" --result "NOT FOUND" --color YELLOW
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fi
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fi
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if [ ${PFFOUND} -eq 1 ]; then
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FIREWALL_ACTIVE=1
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FIREWALL_SOFTWARE="pf"
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else
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logtext "Result: pf not running on this system"
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Display --indent 2 --text "- Checking pf" --result "NOT FOUND" --color WHITE
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4520
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# Description : Check pf configuration consistency
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if [ ${PFFOUND} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FIRE-4520 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check pf configuration consistency"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: check /etc/pf.conf"
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# Test for warnings (-n don't load the rules)
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if [ -f /etc/pf.conf ]; then
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logtext "Result: /etc/pf.conf exists"
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# Check results from pfctl
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PFWARNINGS=`pfctl -n -f /etc/pf.conf -vvv 2>&1 | grep -i 'warning'`
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if [ "${PFWARNINGS}" = "" ]; then
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Display --indent 4 --text "- Checking pf configuration consistency" --result OK --color GREEN
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logtext "Result: no pf filter warnings found"
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else
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Display --indent 4 --text "- Checking pf configuration consistency" --result WARNING --color RED
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logtext "Result: found one or more warnings in the pf filter rules"
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ReportWarning ${TEST_NO} "H" "Found one or more warnings in pf configuration file"
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ReportSuggestion ${TEST_NO} "Run 'pfctl -n -f /etc/pf.conf -vvv' to see available pf warnings"
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fi
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else
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logtext "Result: /etc/pf.conf does NOT exist"
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4522
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# Description : Check ipchains
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#
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#################################################################################
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#
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# Test : FIRE-4524
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# Description : Check for CSF (ConfigServer Security & Firewall)
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Register --test-no FIRE-4524 --weight L --network NO --description "Check for CSF presence"
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if [ ${SKIPTEST} -eq 0 ]; then
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FILE="/etc/csf/csf.conf"
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logtext "Test: check ${FILE}"
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if [ -f ${FILE} ]; then
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logtext "Result: ${FILE} exists"
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FIREWALL_ACTIVE=1
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FIREWALL_SOFTWARE="csf"
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Display --indent 2 --text "- Checking CSF status (configuration file)" --result FOUND --color GREEN
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else
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logtext "Result: ${FILE} does NOT exist"
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4526
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# Description : Check ipf (Solaris)
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if [ ! "${IPFBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no FIRE-4526 --os Solaris --preqs-met ${PREQS_MET} --weight L --network NO --description "Check ipf status"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=`${IPFBINARY} -n -V | grep "^Running" | awk '{ print $2 }'`
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if [ "${FIND}" = "yes" ]; then
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Display --indent 4 --text "- Checking ipf status" --result RUNNING --color GREEN
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logtext "Result: ipf is enabled and running"
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FIREWALL_ACTIVE=1
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FIREWALL_SOFTWARE="ipf"
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else
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Display --indent 4 --text "- Checking ipf status" --result "NOT RUNNING" --color YELLOW
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logtext "Result: ipf is not running"
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fi
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fi
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#
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#################################################################################
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#
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# Test : FIRE-4530
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# Description : Check ipfw
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#
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#################################################################################
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#
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# Test : FIRE-4590
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# Description : Check if at least one firewall if active
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Register --test-no FIRE-4590 --weight L --network NO --description "Check firewall status"
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if [ ${SKIPTEST} -eq 0 ]; then
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if [ ${FIREWALL_ACTIVE} -eq 1 ]; then
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Display --indent 2 --text "- Checking host based firewall" --result ACTIVE --color GREEN
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logtext "Result: host based firewall or packet filter is active"
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report "manual[]=Verify if there is a formal process for testing and applying firewall rules"
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report "manual[]=Verify all traffic is filtered the right way between the different security zones"
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report "manual[]=Verify if a list is available with all required services"
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# YYY Solaris ipf (determine default policy)
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report "manual[]=Make sure an explicit deny all is the default policy for all unmatched traffic"
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AddHP 5 5
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else
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Display --indent 2 --text "- Checking host based firewall" --result "NOT ACTIVE" --color YELLOW
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logtext "Result: no host based firewall/packet filter found or configured"
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ReportSuggestion ${TEST_NO} "Configure a firewall/packet filter to filter incoming and outgoing traffic"
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AddHP 0 5
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fi
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fi
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#
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#################################################################################
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#
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# Report firewall installed for now, if we found one active. Next step would be determining binaries first and apply additional checks.
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report "firewall_installed=${FIREWALL_ACTIVE}"
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report "firewall_active=${FIREWALL_ACTIVE}"
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report "firewall_software=${FIREWALL_SOFTWARE}"
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wait_for_keypress
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#
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#================================================================================
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# Lynis - Copyright 2007-2015, Michael Boelen, CISOfy - https://cisofy.com
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