lynis/include/tests_networking

#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2020, 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.
#
#################################################################################
#
# Networking
#
#################################################################################
#
    FOUNDPROMISC=0                                  # Promiscuous interfaces
    LOCAL_DNSRESOLVER_FOUND=0                       # Local DNS resolver
    NUMBERACTIVENS=0                                # Number of active nameservers
    DHCP_CLIENT_RUNNING=0                           # DHCP client availability
    ARPWATCH_RUNNING=0                              # ARP-cache based attack monitoring software
    ARPON_RUNNING=0                                 # ARP-cache based attack monitoring software
#
#################################################################################
#
    InsertSection "Networking"
#
#################################################################################
#
    # Test        : NETW-2600
    # Description : Gather IPv6 configuration
    Register --test-no NETW-2600 --os "Linux" --weight L --network YES --category security --description "Checking IPv6 configuration"
    if [ ${SKIPTEST} -eq 0 ]; then
        IPV6_CONFIGURED=0
        IPV6_ACCEPT_RA=255
        IPV6_ACCEPT_REDIRECTS=255
        IPV6_MANUAL_CONFIGURED=255
        IPV6_ONLY=255
        IPV6_MISCONFIGURED=0
        IPV6_MISCONFIGURED_MTU=0
        FIND=$(sysctl -a 2> /dev/null | ${GREPBINARY} "^net.ipv6" | ${SEDBINARY} "s/ = /=/")
        if [ -n "${FIND}" ]; then
            IPV6_CONFIGURED=1
            for I in ${FIND}; do
                SYSCTL_KEY=$(echo ${I} | ${AWKBINARY} -F= '{ print $1 }')
                SYSCTL_VALUE=$(echo ${I} | ${AWKBINARY} -F= '{ print $2 }')
                case ${SYSCTL_KEY} in
                    "net.ipv6.conf.default.accept_ra")
                        if [ "${SYSCTL_VALUE}" = "1" ]; then IPV6_ACCEPT_RA=1; else IPV6_ACCEPT_RA=0; fi
                    ;;
                    "net.ipv6.conf.default.accept_redirects")
                        if [ "${SYSCTL_VALUE}" = "1" ]; then IPV6_ACCEPT_REDIRECTS=1; else IPV6_ACCEPT_REDIRECTS=0; fi
                    ;;
                    "net.ipv6.bindv6only")
                        if [ "${SYSCTL_VALUE}" = "1" ]; then IPV6_ONLY=1; else IPV6_ONLY=0; fi
                    ;;
                    "net.ipv6.conf.all.mtu" | "net.ipv6.conf.default.mtu")
                        if [ ${SYSCTL_VALUE} -lt 1280 ]; then IPV6_MISCONFIGURED_MTU=1; fi
                    ;;

                    #if TestValue --function equals --value "${SYSCTL_VALUE}" --search "1"; then
                    #     echo "Found ${SYSCTL_VALUE}"
                    #else
                    #     echo "Not found"
                    #fi
                esac
            done
        else
            IPV6_MODE="disabled"
        fi
        # Check if we are manually configured (not accepting automatic configuration)
        if [ ${IPV6_ACCEPT_RA} -eq 0 -a ${IPV6_ACCEPT_REDIRECTS} -eq 0 ]; then
            IPV6_MANUAL_CONFIGURED=1
            IPV6_MODE="manual"
        elif [ ${IPV6_ACCEPT_RA} -eq 1 -o ${IPV6_ACCEPT_REDIRECTS} -eq 1 ]; then
            IPV6_MODE="auto"
        else
            IPV6_MODE="disabled"
        fi

        LogText "Result: IPV6 mode is ${IPV6_MODE}"
        if [ ${IPV6_CONFIGURED} -eq 1 ]; then
            Display --indent 2 --text "- Checking IPv6 configuration" --result "${STATUS_ENABLED}" --color WHITE
            STATUS=$(echo ${IPV6_MODE} | ${TRBINARY} '[:lower:]' '[:upper:]')
            Display --indent 6 --text "Configuration method" --result "${STATUS}" --color WHITE
            if [ ${IPV6_ONLY} -eq 1 ]; then STATUS="YES"; else STATUS="NO"; fi
            LogText "Result: IPv6 only configuration: ${STATUS}"
            Display --indent 6 --text "IPv6 only" --result "${STATUS}" --color WHITE
        else
            Display --indent 2 --text "- Checking IPv6 configuration" --result "${STATUS_DISABLED}" --color WHITE
        fi
        # Configuration errors
        if [ ${IPV6_MISCONFIGURED_MTU} -eq 1 ]; then
            IPV6_MISCONFIGURED=1
            LogText "Result: MTU of IPv6 interfaces should be 1280 or higher"
            Display --indent 6 --text "Error: MTU is too low" --result "${STATUS_WARNING}" --color RED
            ReportSuggestion "${TEST_NO}" "Check your MTU configuration of IPv6 interfaces"
        fi

        # Possible improvements:
        # - Check if we found IPv6 enabled nameservers

        # Report
        Report "ipv6_mode=${IPV6_MODE}"
        Report "ipv6_only=${IPV6_ONLY}"
    fi
#
#################################################################################
#
    # Test        : NETW-2704
    # Description : Basic nameserver configuration tests (connectivity)
    Register --test-no NETW-2704 --weight L --network YES --category security --description "Basic nameserver configuration tests"
    if [ ${SKIPTEST} -eq 0 ]; then
        Display --indent 2 --text "- Checking configured nameservers"
        LogText "Test: Checking /etc/resolv.conf file"
        if [ -f /etc/resolv.conf ]; then
            LogText "Result: Found /etc/resolv.conf file"
            FIND=$(${GREPBINARY} '^nameserver' /etc/resolv.conf | ${TRBINARY} -d '\t' | ${SEDBINARY} 's/nameserver*//g' | uniq | ${CUTBINARY} -d# -f1)
            if [ -n "${FIND}" ]; then
                Display --indent 4 --text "- Testing nameservers"
                LogText "Test: Querying nameservers"
                for I in ${FIND}; do
                    LogText "Found nameserver: ${I}"
                    Report "nameserver[]=${I}"
                    # Check if a local resolver is available (like DNSMasq)
                    if [ "${I}" = "::1" -o "${I}" = "127.0.0.1" -o "${I}" = "127.0.0.53" -o "${I}" = "127.0.1.1" -o "${I}" = "0.0.0.0" ]; then
                        LOCAL_DNSRESOLVER_FOUND=1
                    fi
                    if [ -n "${DIGBINARY}" ]; then
                        # See if we can query something at the nameserver
                        # 0=good, other=bad
                        DNSRESPONSE=$(${DIGBINARY} +noall +time=3 +retry=0 @${I} ${FQDN} > /dev/null ; echo $?)
                        if [ "${DNSRESPONSE}" = "0" ]; then
                            Display --indent 8 --text "Nameserver: ${I}" --result "${STATUS_OK}" --color GREEN
                            LogText "Nameserver ${I} seems to respond to queries from this host."
                            # Count responsive nameservers
                            NUMBERACTIVENS=$((NUMBERACTIVENS + 1))
                        else
                            Display --indent 8 --text "Nameserver: ${I}" --result "NO RESPONSE" --color RED
                            LogText "Result: nameserver ${I} does NOT respond"
                            LogText "Exit-code from dig: ${DNSRESPONSE}"
                            ReportSuggestion "${TEST_NO}" "Check connection to this nameserver and make sure no outbound DNS queries are blocked (port 53 UDP and TCP)."
                            ReportWarning "${TEST_NO}" "Nameserver ${I} does not respond"
                        fi
                    else
                        LogText "Result: Nameserver test for ${I} skipped, 'dig' not installed"
                        Display --indent 6 --text "Nameserver: ${I}" --result "${STATUS_SKIPPED}" --color YELLOW
                    fi
                done
            fi
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-2705
    # Description : Basic nameserver configuration tests (connectivity)
    if [ ${LOCAL_DNSRESOLVER_FOUND} -eq 0 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-2705 --preqs-met ${PREQS_MET} --weight L --network YES --category security --description "Check availability two nameservers"
    if [ ${SKIPTEST} -eq 0 ]; then
        SKIP=0
        if [ -n "${DIGBINARY}" ]; then
            if [ ${NUMBERACTIVENS} -lt 2 ]; then
                Display --indent 4 --text "- Minimal of 2 responsive nameservers" --result "${STATUS_WARNING}" --color RED
                LogText "Result: less than 2 responsive nameservers found"
                ReportWarning "${TEST_NO}" "Couldn't find 2 responsive nameservers"
                LogText "Note: Non responsive nameservers can give problems for your system(s). Like the lack of recursive lookups, bad connectivity to update servers etc."
                ReportSuggestion "${TEST_NO}" "Check your resolv.conf file and fill in a backup nameserver if possible"
                AddHP 1 2
            else
                Display --indent 4 --text "- Minimal of 2 responsive nameservers" --result "${STATUS_OK}" --color GREEN
                LogText "Result: found at least 2 responsive nameservers"
                AddHP 3 3
            fi
        else
            Display --indent 4 --text "- Minimal of 2 responsive nameservers" --result "${STATUS_SKIPPED}" --color YELLOW
            LogText "Result: dig not installed, test can't be fully performed"
        fi
    else
        LogText "Result: Test most likely skipped due having local resolver in /etc/resolv.conf"
    fi
#
#################################################################################
#
    # Test        : NETW-2706
    # Description : Check systemd-resolved and upstream DNSSEC status
    if [ -n "${RESOLVECTLBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-2706 --preqs-met ${PREQS_MET} --weight L --network YES --category security --description "Check systemd-resolved and upstream DNSSEC status"
    if [ ${SKIPTEST} -eq 0 ]; then
        SKIP=0
        if [ -n "${RESOLVECTLBINARY}" ]; then
            DNSSEC_STATUS=$(${RESOLVECTLBINARY} statistics 2> /dev/null | ${AWKBINARY} -F ":" '/DNSSEC supported/ { print $2 }' | ${TRBINARY} -d ' ')
            if [ "${DNSSEC_STATUS}" = "yes" ]; then
                Display --indent 4 --text "- DNSSEC supported (systemd-resolved)" --result "${STATUS_OK}" --color GREEN
                LogText "Result: DNSSEC supported by systemd-resolved and upstream DNS servers"
            else
                Display --indent 4 --text "- DNSSEC supported (systemd-resolved)" --result "${STATUS_WARNING}" --color RED
                LogText "Result: DNSSEC not supported by systemd-resolved or upstream DNS servers"
            fi
        else
            Display --indent 4 --text "- DNSSEC supported (systemd-resolved)" --result "${STATUS_SKIPPED}" --color YELLOW
            LogText "Result: resolvectl not installed, test can't be fully performed"
        fi
    else
        LogText "Result: Test most likely skipped due to not having resolvectl"
    fi
#
#################################################################################
#
    # Test        : NETW-3001
    # Description : Find default gateway (route)
    # More info   : BSD: ^default   Linux: 0.0.0.0
    if [ -n "${NETSTATBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-3001 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Find default gateway (route)"
    if [ $SKIPTEST -eq 0 ]; then
        LogText "Test: Searching default gateway(s)"
        FIND=$(${NETSTATBINARY} -rn | ${EGREPBINARY} "^0.0.0.0|default" | ${TRBINARY} -s ' ' | ${CUTBINARY} -d ' ' -f2)
        if [ -n "${FIND}" ]; then
            for I in ${FIND}; do
                LogText "Result: Found default gateway ${I}"
                Report "default_gateway[]=${I}"
            done
            Display --indent 2 --text "- Checking default gateway" --result "${STATUS_DONE}" --color GREEN
        else
            LogText "Result: No default gateway found"
            Display --indent 2 --text "- Checking default gateway" --result "NONE FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3004
    # Description : Find available network interfaces
    Register --test-no NETW-3004 --weight L --network NO --category security --description "Search for available network interfaces"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""
        case ${OS} in
            AIX)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${GREPBINARY} "flags=" | ${AWKBINARY} -F ":" '{ print  $1 }')
            ;;
            Linux)
                if [ -n "${IPBINARY}" ]; then
                    FIND=$(${IPBINARY} link show 2> /dev/null | ${GREPBINARY} "^[0-9]" | ${AWKBINARY} '{ print $2 }' | ${SEDBINARY} 's/://g')
                elif [ -n "${IFCONFIGBINARY}" ]; then
                    FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ( $2 == "Link" ) { print  $1 }}')
                fi
            ;;
            DragonFly|FreeBSD|macOS|NetBSD)
                FIND=$(${IFCONFIGBINARY} -l 2> /dev/null)
            ;;
            OpenBSD|Solaris)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${GREPBINARY} "flags=" | ${AWKBINARY} -F ": " '{ print  $1 }')
            ;;
            *)
                # Having a system currently unsupported? Share your details to determine network interfaces
                ReportException "${TEST_NO}:1" "No support for this OS (${OS}) to find available network interfaces"
            ;;
        esac
        if HasData "${FIND}"; then
            for ITEM in ${FIND}; do
                NETWORK_INTERFACES="${NETWORK_INTERFACES}|${ITEM}"
                LogText "Found network interface: ${ITEM}"
                Report "network_interface[]=${ITEM}"
            done
        else
            ReportException "${TEST_NO}:1" "No interfaces found on this system (OS=${OS})"
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3006
    # Description : Get network MAC addresses
    Register --test-no NETW-3006 --weight L --network NO --category security --description "Get network MAC addresses"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""
        case ${OS} in
            AIX)
                FIND=$(lscfg -vl ent* | ${GREPBINARY} "Network Address" | ${CUTBINARY} -d"." -f14 | ${AWKBINARY} '{ ctr=1; i=1; while (ctr <= 6) { d[ctr++]=substr($0,i,2);i=i+2 } printf("%s:%s:%s:%s:%s:%s\n",d[1],d[2],d[3],d[4],d[5],d[6]) }')
                ;;
            DragonFly|FreeBSD)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="ether") print $2 }' | ${SORTBINARY} -u)
                ;;
            Linux)
                if [ -n "${IFCONFIGBINARY}" ]; then
                    FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${GREPBINARY} "HWaddr" | ${AWKBINARY} '{ if ($4=="HWaddr") print $5 }' | ${SORTBINARY} -u)
                    # CentOS 7.x and others may return nothing. Let's retry with 'ether' field.
                    if [ -z "${FIND}" ]; then
                        FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="ether") print $2 }' | ${SORTBINARY} -u)
                    fi
                else
                    if [ -n "${IPBINARY}" ]; then
                        LogText "Test: Using ip binary to gather hardware addresses"
                        FIND=$(${IPBINARY} link 2> /dev/null | ${GREPBINARY} "link/ether" | ${AWKBINARY} '{ print $2 }')
                    else
                        ReportException "${TEST_NO}:2" "Missing ifconfig or ip command to collect hardware address (MAC)"
                    fi
                fi
                ;;
            macOS)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="lladdr" || $1=="ether") print $2 }' | ${SORTBINARY} -u)
                ;;
            NetBSD)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="address:") print $2 }' | ${SORTBINARY} -u)
                ;;
            OpenBSD)
                FIND=$(${IFCONFIGBINARY} -A 2> /dev/null | ${AWKBINARY} '{ if ($1=="lladdr") print $2 }' | ${SORTBINARY} -u)
                ;;
            Solaris)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="ether") print $2 }' | ${SORTBINARY} -u)
                ;;
            *)
                # Having a system currently unsupported? Share your details to determine MAC information
                ReportException "${TEST_NO}:1" "No support for this OS (${OS}) to find MAC information"
                ;;
        esac
        for ITEM in ${FIND}; do
            LogText "Found MAC address: ${ITEM}"
            Report "network_mac_address[]=${ITEM}"
        done
    fi
#
#################################################################################
#
    # Test        : NETW-3008
    # Description : Get network IPv4/6 addresses
    Register --test-no NETW-3008 --weight L --network NO --category security --description "Get network IP addresses"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""; FIND2=""
        case ${OS} in
            AIX)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") print $2 }')
                FIND2=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6") print $2 }')
                ;;
            DragonFly|FreeBSD|NetBSD)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") print $2 }')
                FIND2=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6") print $2 }')
                ;;
            Linux)
                if [ -n "${IFCONFIGBINARY}" ]; then
                    FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") print $2 }' | ${CUTBINARY} -d ':' -f2)
                    # Version which works for multiple types of ifconfig (e.g. Slackware)
                    FIND2=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6" && $2=="addr:") { print $3 } else { if ($1=="inet6" && $3=="prefixlen") { print $2 } } }')
                else
                    if [ -n "${IPBINARY}" ]; then
                        LogText "Test: Using ip binary to gather IP addresses"
                        FIND=$(${IPBINARY} addr 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") { print $2 }}' | ${SEDBINARY} 's/\/.*//')
                        FIND2=$(${IPBINARY} addr 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6") { print $2 }}' | ${SEDBINARY} 's/\/.*//')
                    else
                        ReportException "${TEST_NO}:2" "Missing ifconfig or ip command to collect hardware address (MAC)"
                    fi
                fi
                ;;
            macOS)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") print $2 }')
                FIND2=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6") print $2 }')
                ;;
            OpenBSD)
                FIND=$(${IFCONFIGBINARY} -A 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") print $2 }')
                FIND2=$(${IFCONFIGBINARY} -A 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6") print $2 }')
                ;;
            Solaris)
                FIND=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet") print $2 }')
                FIND2=$(${IFCONFIGBINARY} -a 2> /dev/null | ${AWKBINARY} '{ if ($1=="inet6") print $2 }')
                ;;
            *)
                LogText "Result: no support yet for this OS (${OS}) to find IP address information. You can help improving this test by submitting your details."
                ReportException "${TEST_NO}:1" "IP address information test not implemented for this operating system"
                ;;
        esac

        # IPv4
        for ITEM in ${FIND}; do
            LogText "Found IPv4 address: ${ITEM}"
            Report "network_ipv4_address[]=${ITEM}"
        done
        # IPv6
        for ITEM in ${FIND2}; do
            LogText "Found IPv6 address: ${ITEM}"
            Report "network_ipv6_address[]=${ITEM}"
        done
    fi
#
#################################################################################
#
    # Test        : NETW-3012
    # Description : Check listening ports
    Register --test-no NETW-3012 --weight L --network NO --category security --description "Check listening ports"
    if [ ${SKIPTEST} -eq 0 ]; then
        DATA=""
        FIND=""; FIND2=""
        COUNT=0
        case ${OS} in
            DragonFly | FreeBSD)
                if [ -n "${SOCKSTATBINARY}" ]; then
                    FIND=$(${SOCKSTATBINARY} | ${AWKBINARY} '{ if ($7 ~ /\*:\*/) print $5"|"$6"|"$2"|" }' | ${SORTBINARY} -u)
                    # To strip off IP's: ${SEDBINARY} 's/|.*:/|/'
                else
                    FIND=""
                fi
                FIND2=""
            ;;
            Linux)
                if [ -n "${SSBINARY}" ]; then
                    LogText "Test: Retrieving ss information to find listening ports"
                    DATA=$(${SSBINARY} --query=udp,tcp -plnt | ${AWKBINARY} '{ if ($1!="Netid") { print "raw,ss,v1|"$1"|"$5"|"$7"|" }}' | ${SEDBINARY} 's/pid=[0-9]\{1,\},fd=[0-9]\{1,\}//g' | ${SEDBINARY} 's/users://' | ${SEDBINARY} 's/,)//g' | ${TRBINARY} -d '()"')
                elif [ -n "${NETSTATBINARY}" ]; then
                    LogText "Test: Retrieving netstat information to find listening ports"
                    # UDP
                    FIND=$(${NETSTATBINARY} -nlp 2> /dev/null | ${GREPBINARY} "^udp" | ${AWKBINARY} '{ print $4"|"$1"|"$6"|" }' | ${SEDBINARY} 's:|[0-9]*/:|:')
                    # TCP
                    FIND2=$(${NETSTATBINARY} -nlp 2> /dev/null  | ${GREPBINARY} "^tcp" | ${AWKBINARY} '{ if($6=="LISTEN") { print $4"|"$1"|"$7"|" }}' | ${SEDBINARY} 's:|[0-9]*/:|:')
                else
                    ReportException "${TEST_NO}:1" "netstat and ss binary missing to gather listening ports"
                fi
            ;;

            macOS)
                if [ -n "${LSOFBINARY}" ]; then
                    LogText "Test: Retrieving lsof information to find listening ports"
                    # UDP and TCP combined
                    FIND=$(${LSOFBINARY}${LSOF_EXTRA_OPTIONS} -i -P | ${AWKBINARY} '{ print $9"|"$8"|"$1"|" }' | ${SEDBINARY} 's/\(.*\)\-\>.*\(\|.*\)/\1\2/' | ${SEDBINARY} 's/\*/'$IP'/' | ${SORTBINARY} -u | ${GREPBINARY} -v "NAME")
                else
                    FIND=""
                fi
                # Not needed as we have a combined test
                FIND2=""
            ;;
            NetBSD)
                if [ -n "${SOCKSTATBINARY}" ]; then
                    LogText "Test: Retrieving sockstat information to find listening ports"
                    FIND=$(${SOCKSTATBINARY} 2> /dev/null | ${AWKBINARY} '{ if ($7 ~ /\*.\*/) print $5"|"$6"|"$2"|" }' | ${SORTBINARY} -u)
                else
                    FIND=""
                fi
                FIND2=""
            ;;
            OpenBSD)
                if [ -n "${NETSTATBINARY}" ]; then
                    LogText "Test: Retrieving netstat information to find listening ports"
                    # UDP
                    FIND=$(${NETSTATBINARY} -an 2> /dev/null | ${GREPBINARY} "^udp" | ${AWKBINARY} '{ print $4"|"$1"||" }')
                    # TCP
                    FIND2=$(${NETSTATBINARY} -an 2> /dev/null  | ${GREPBINARY} "^tcp" | ${AWKBINARY} '{ if($6=="LISTEN") { print $4"|"$1"||" }}')
                else
                    ReportException "${TEST_NO}:3" "netstat missing to gather listening ports"
                fi
            ;;
            *)
                # Got this exception? Provide your details and output of netstat or any other tool to determine this information.
                ReportException "${TEST_NO}:2" "Unclear what method to use, to determine listening port information"
            ;;
        esac

        if [ -n "${DATA}" ]; then
            for ITEM in ${DATA}; do
                COUNT=$((COUNT + 1))
                Report "network_listen[]=${ITEM}"
            done
        fi

        if [ -n "${FIND}" ]; then
            for ITEM in ${FIND}; do
                COUNT=$((COUNT + 1))
                LogText "Found listening info: ${ITEM}"
                Report "network_listen_port[]=${ITEM}"
            done
        fi

        if [ -n "${FIND2}" ]; then
            for ITEM in ${FIND2}; do
                COUNT=$((COUNT + 1))
                LogText "Found listening info: ${ITEM}"
                Report "network_listen_port[]=${ITEM}"
            done
        fi
        if [ -z "${DATA}" -a -z "${FIND}" ]; then
            Display --indent 2 --text "- Getting listening ports (TCP/UDP)" --result "${STATUS_SKIPPED}" --color YELLOW
        else
            Display --indent 2 --text "- Getting listening ports (TCP/UDP)" --result "${STATUS_DONE}" --color GREEN
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3014
    # Description : Checking promiscuous interfaces (BSD)
    # Note        : FreeBSD and others
    if [ "${OS}" = "DragonFly" -o "${OS}" = "FreeBSD" -o "${OS}" = "NetBSD" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-3014 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking promiscuous interfaces (BSD)"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking promiscuous interfaces (FreeBSD)"
        FIND=$(${IFCONFIGBINARY} 2> /dev/null | ${GREPBINARY} PROMISC | ${CUTBINARY} -d ':' -f1)
        if HasData "${FIND}"; then
            LogText "Result: Promiscuous interfaces: ${FIND}"
            for ITEM in ${FIND}; do
                WHITELISTED=0
                for PROFILE in ${PROFILES}; do
                    Debug "Checking if interface ${ITEM} is whitelisted in profile ${PROFILE}"
                    ISWHITELISTED=$(${GREPBINARY} "^if_promisc:${ITEM}:" ${PROFILE})
                    if HasData "${ISWHITELISTED}"; then
                        WHITELISTED=1
                        LogText "Result: this interface was whitelisted in profile (${PROFILE})"
                    fi
                done
                # Check if this interface was whitelisted
                if [ ${WHITELISTED} -eq 0 ]; then
                    FOUNDPROMISC=1
                    ReportWarning "${TEST_NO}" "Found promiscuous interface (${ITEM})"
                    LogText "Note: some tools put an interface into promiscuous mode, to capture/log network traffic"
                else
                    LogText "Result: Found promiscuous interface ${ITEM} (*whitelisted via profile*)"
                fi
            done
        fi

        # Show result
        if [ ${FOUNDPROMISC} -eq 0 ]; then
            Display --indent 2 --text "- Checking promiscuous interfaces" --result "${STATUS_OK}" --color GREEN
            LogText "Result: No promiscuous interfaces found"
        else
            Display --indent 2 --text "- Checking promiscuous interfaces" --result "${STATUS_WARNING}" --color RED
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3015
    # Description : Checking promiscuous interfaces (Linux)
    Register --test-no NETW-3015 --os Linux --weight L --network NO --category security --description "Checking promiscuous interfaces (Linux)"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUNDPROMISC=99
        NETWORK=""
        USE_IP_INSTEAD_IFCONFIG=0

        if [ -n "${IPBINARY}" ]; then
            LogText "Test: Using ip binary to retrieve network interfaces"
            NETWORK=$(${IPBINARY} -o link 2> /dev/null | ${GREPBINARY} "^[0-9]" | ${AWKBINARY} '{print $2 }' | ${TRBINARY} -d ':')
            USE_IP_INSTEAD_IFCONFIG=1
        elif [ -n "${IFCONFIGBINARY}" ]; then
            LogText "Test: Using ifconfig binary to retrieve network interfaces"
            NETWORK=$(${IFCONFIGBINARY} 2> /dev/null | ${GREPBINARY} Link | ${TRBINARY} -s ' ' | ${CUTBINARY} -d ' ' -f1)
        fi

        LogText "Test: Checking all interfaces to discover any with promiscuous mode enabled"
        if [ -n "${NETWORK}" ]; then
            FOUNDPROMISC=0
            for I in ${NETWORK}; do
                if [ ${USE_IP_INSTEAD_IFCONFIG} -eq 1 ]; then
                    FIND=$(${IPBINARY} -o -d link show ${I} 2> /dev/null | ${GREPBINARY} "promiscuity [1-9]")
                else
                    FIND=$(${IFCONFIGBINARY} ${I} 2> /dev/null | ${GREPBINARY} PROMISC)
                fi
                if [ -n "${FIND}" ]; then
                    LogText "Result: Promiscuous interface: ${I}"
                    ISWHITELISTED=$(${GREPBINARY} "^if_promisc:${I}:" ${PROFILE})
                    if [ -z "${ISWHITELISTED}" ]; then
                        FOUNDPROMISC=1
                        ReportWarning "${TEST_NO}" "Found promiscuous interface" "${I}" "text:Determine if this mode is required or whitelist interface in profile"
                        LogText "Note: some tools put an interface into promiscuous mode, to capture/log network traffic"
                    else
                        LogText "Result: Found promiscuous interface ${I} (*whitelisted via profile*)"
                    fi
                fi
            done
        else
            LogText "Result: no network interfaces discovered, so nothing tested"
        fi

        # Show result
        if [ ${FOUNDPROMISC} -eq 0 ]; then
            Display --indent 2 --text "- Checking promiscuous interfaces" --result "${STATUS_OK}" --color GREEN
            LogText "Result: No promiscuous interfaces found"
        elif [ ${FOUNDPROMISC} -eq 1 ]; then
            Display --indent 2 --text "- Checking promiscuous interfaces" --result "${STATUS_WARNING}" --color RED
        else
            Display --indent 2 --text "- Checking promiscuous interfaces" --result "${STATUS_UNKNOWN}" --color YELLOW
        fi
    fi
#
#################################################################################
#
    # Do you have a multipath configuration on Linux or other OS? Create a related test and send in a pull request on GitHub

    # Test        : NETW-3020 TODO
    # Description : Checking multipath configuration
#
#################################################################################
#
    # Test        : NETW-3028
    # Description : Checking for many waiting connections
    # Type        : Performance
    # Notes       : It is common to see a healthy web server seeing to have several thousands of TCP connections in WAIT state
    if [ ! "${NETSTATBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-3028 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Checking connections in WAIT state"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Using netstat for check for connections in WAIT state"
        FIND=$(${NETSTATBINARY} -an | ${GREPBINARY} WAIT | ${WCBINARY} -l | ${AWKBINARY} '{ print $1 }')
        if IsEmpty "${OPTIONS_CONN_MAX_WAIT_STATE}"; then OPTIONS_CONN_MAX_WAIT_STATE="5000"; fi
        LogText "Result: currently ${FIND} connections are in a waiting state (max configured: ${OPTIONS_CONN_MAX_WAIT_STATE})."
        if [ ${FIND} -gt ${OPTIONS_CONN_MAX_WAIT_STATE} ]; then
            Display --indent 2 --text "- Checking waiting connections" --result "${STATUS_WARNING}" --color YELLOW
            ReportSuggestion "${TEST_NO}" "Determine why system has many connections in WAIT state (${FIND})"
        else
            Display --indent 2 --text "- Checking waiting connections" --result "${STATUS_OK}" --color GREEN
            LogText "Result: ${FIND} connections are in WAIT state"
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3030
    # Description : Checking for DHCP client
    Register --test-no NETW-3030 --weight L --network NO --category security --description "Checking DHCP client status"
    if [ ${SKIPTEST} -eq 0 ]; then
        if IsRunning "dhclient" || IsRunning "dhcpcd" || IsRunning "udhcpc"; then
            Display --indent 2 --text "- Checking status DHCP client" --result "${STATUS_RUNNING}" --color WHITE
            DHCP_CLIENT_RUNNING=1
        else
            Display --indent 2 --text "- Checking status DHCP client" --result "NOT ACTIVE" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3032
    # Description : Checking for ARP spoofing and related monitoring software
    Register --test-no NETW-3032 --os Linux --weight L --network NO --category security --description "Checking for ARP monitoring software"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0

        # addrwatch
        if IsRunning "addrwatch"; then
            FOUND=1
        fi

        # arpwatch
        if IsRunning "arpwatch"; then
            FOUND=1
            ARPWATCH_RUNNING=1
        fi

        # arpon
        if IsRunning "arpon"; then
            FOUND=1
            ARPON_RUNNING=1
        fi

        if [ ${FOUND} -eq 1 ]; then
            Display --indent 2 --text "- Checking for ARP monitoring software" --result "${STATUS_RUNNING}" --color GREEN
        else
            Display --indent 2 --text "- Checking for ARP monitoring software" --result "${STATUS_NOT_FOUND}" --color YELLOW
            #ReportSuggestion "${TEST_NO}" "Consider running ARP monitoring software (addrwatch,arpwatch,arpon)"
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3200
    # Description : Determine available network protocols
    # Notes       : See all available supported modules: ls -d /lib/modules/$(uname -r )/kernel/net
    #               To see active/enabled protocols: ls -d /proc/sys/net
    Register --test-no NETW-3200 --weight L --network YES --category security --description "Determine available network protocols"
    if [ ${SKIPTEST} -eq 0 ]; then
        TESTED=0
        FOUND_UNCOMMON_PROTOCOL_ENABLED=0
        case ${OS} in
            Linux)
                TESTED=1
                LogText "Test: checking the status of some network protocols that typically are not used"
                UNCOMMON_PROTOCOLS="dccp sctp rds tipc"
                for P in ${UNCOMMON_PROTOCOLS}; do
                    LogText "Test: now checking module '${P}'"
                    if ! SkipAtomicTest "${TEST_NO}:${P}"; then
                        UNCOMMON_PROTOCOL_DISABLED=0
                        # First check modprobe.conf
                        if [ -f ${ROOTDIR}etc/modprobe.conf ]; then
                            DATA=$(${GREPBINARY} "^install ${P} /bin/true" ${ROOTDIR}etc/modprobe.conf)
                            if [ -n "${DATA}" ]; then
                                LogText "Result: found ${P} module disabled via modprobe.conf"
                                UNCOMMON_PROTOCOL_DISABLED=1
                            fi
                        fi
                        # Then additional modprobe configuration files
                        if [ -d ${ROOTDIR}etc/modprobe.d ]; then
                            DATA=$(${GREPBINARY} --files-with-matches --no-messages "^install ${P} /bin/true" ${ROOTDIR}etc/modprobe.d/*)
                            if [ -n "${DATA}" ]; then
                                UNCOMMON_PROTOCOL_DISABLED=1
                                for F in ${DATA}; do
                                    LogText "Result: found ${P} module disabled via ${F}"
                                done
                            fi
                        fi

                        if [ ${UNCOMMON_PROTOCOL_DISABLED} -eq 0 ]; then
                            ReportSuggestion "${TEST_NO}" "Determine if protocol '${P}' is really needed on this system"
                            Report "uncommon_network_protocol_enabled=${P}"
                            FOUND_UNCOMMON_PROTOCOL_ENABLED=1
                        fi
                    fi
                done

            ;;
            *)
                LogText "This test has no routine yet for this operating system."
                Debug "No routine implemented yet for this operating system to check for available network protocols"
            ;;
        esac
        if [ ${TESTED} -eq 1 ]; then
            if [ ${FOUND_UNCOMMON_PROTOCOL_ENABLED} -eq 1 ]; then
                Display --indent 2 --text "- Uncommon network protocols" --result "${FOUND}" --color YELLOW
            else
                Display --indent 2 --text "- Uncommon network protocols" --result "${STATUS_NOT_FOUND}" --color GREEN
            fi
        fi
        unset DATA F FOUND TESTED UNCOMMON_PROTOCOLS
    fi
#
#################################################################################
#


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#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com