lynis/include/tests_networking

#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2013-2016, 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
#
#################################################################################
#
    InsertSection "Networking"
#
#################################################################################
#
    # Test        : NETW-2600
    # Description : Gather IPv6 configuration
    Register --test-no NETW-2600 --os "Linux" --weight L --network YES --description "Checking IPv6 configuration"
    if [ ${SKIPTEST} -eq 0 ]; then
        IPV6_CONFIGURED=0
        IPV6_ACCEPT_RA=255
        IPV6_ACCEPT_REDIRECTS=255
        IPV6_MANUAL_CONFIGURED=255
        IPV6_ONLY=255
        IPV6_MISCONFIGURED=0
        IPV6_MISCONFIGURED_MTU=0
        FIND=`sysctl -a 2> /dev/null | grep "^net.ipv6" | sed "s/ = /=/"`
        if [ ! "${FIND}" = "" ]; then
            IPV6_CONFIGURED=1
            for I in ${FIND}; do
                SYSCTL_KEY=`echo ${I} | awk -F= '{ print $1 }'`
                SYSCTL_VALUE=`echo ${I} | awk -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 "ENABLED" --color WHITE
            STATUS=`echo ${IPV6_MODE} | tr '[:lower:]' '[:upper:]'`
            Display --indent 6 --text "Configuration method" --result "${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 "DISABLED" --color WHITE
        fi
        # Configuration errors
        if [ ${IPV6_MISCONFIGURED_MTU} -eq 1 ]; then
            IPV6_MISCONFIGURED=1
            LogText "Result: MTU of IPv6 interfaces should be 1280 or higher"
            Display --indent 6 --text "Error: MTU is too low" --result "WARNING" --color RED
            ReportSuggestion "${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 --description "Basic nameserver configuration tests"
    if [ ${SKIPTEST} -eq 0 ]; then
        Display --indent 2 --text "- Checking configured nameservers"
        LogText "Test: Checking /etc/resolv.conf file"
        if [ -f /etc/resolv.conf ]; then
            LogText "Result: Found /etc/resolv.conf file"
            FIND=`grep '^nameserver' /etc/resolv.conf | tr -d '\t' | sed 's/nameserver*//g' | uniq`
            if [ ! "${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 "${I}" = "0.0.0.0" ]; then
                         LOCAL_DNSRESOLVER_FOUND=1
                    fi
                    if [ ! "${DIGBINARY}" = "" ]; then
                        # See if we can query something at the nameserver
                        # 0=good, other=bad
                        DNSRESPONSE=`${DIGBINARY} +noall +time=3 +retry=0 @${I} ${I} > /dev/null ; echo $?`
                        if [ "${DNSRESPONSE}" = "0" ]; then
                            Display --indent 8 --text "Nameserver: ${I}" --result OK --color GREEN
                            LogText "Nameserver ${I} seems to respond to queries from this host."
                            # Count responsive nameservers
                            NUMBERACTIVENS=`expr ${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} "L" "Nameserver ${I} does not respond"
                        fi
                      else
                        LogText "Result: Nameserver test for ${I} skipped, 'dig' not installed"
                        Display --indent 6 --text "Nameserver: ${I}" --result 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 --description "Check availability two nameservers"
    if [ ${SKIPTEST} -eq 0 ]; then
        if [ ! "${DIGBINARY}" = "" ]; then
            if [ ${NUMBERACTIVENS} -lt 2 ]; then
                Display --indent 4 --text "- Minimal of 2 responsive nameservers" --result WARNING --color RED
                LogText "Result: less than 2 responsive nameservers found"
                ReportWarning ${TEST_NO} "L" "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 ${TEST_NO} "Check your resolv.conf file and fill in a backup nameserver if possible"
                AddHP 1 2
              else
                Display --indent 4 --text "- Minimal of 2 responsive nameservers" --result OK --color GREEN
                LogText "Result: found at least 2 responsive nameservers"
                AddHP 3 3
            fi
          else
            Display --indent 4 --text "- Minimal of 2 responsive nameservers" --result SKIPPED --color YELLOW
            LogText "Result: dig not installed, test can't be fully performed"
        fi
      else
        LogText "Result: Test most likely skipped due having local resolver in /etc/resolv.conf"
    fi
#
#################################################################################
#
    # Test        : NETW-3001
    # Description : Find default gateway (route)
    # More info   : BSD: ^default   Linux: 0.0.0.0
    if [ ! "${NETSTATBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-3001 --preqs-met ${PREQS_MET} --weight L --network NO --description "Find default gateway (route)"
    if [ $SKIPTEST -eq 0 ]; then
        LogText "Test: Searching default gateway(s)"
        FIND=`${NETSTATBINARY} -rn | egrep "^0.0.0.0|default" | tr -s ' ' | cut -d ' ' -f2`
        if [ ! "${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 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 on FreeBSD and others
    Register --test-no NETW-3004 --weight L --network NO --description "Search available network interfaces"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""
        N=0
        case ${OS} in
            AIX)
                FIND=`${IFCONFIGBINARY} -a | ${GREPBINARY} "flags=" | ${AWKBINARY} -F ":" '{ print  $1 }'`
            ;;
            Linux)
                if [ ! "${IPBINARY}" = "" ]; then
                    FIND=`${IPBINARY} link show | ${GREPBINARY} "^[0-9]" | ${AWKBINARY} '{ print $2 }' | sed 's/://g'`
                elif [ ! "${IFCONFIGBINARY}" = "" ]; then
                    FIND=`${IFCONFIGBINARY} -a | ${AWKBINARY} '{ if ( $2 == "Link" ) { print  $1 }}'`
                fi
            ;;
            DragonFly|FreeBSD|NetBSD)
                FIND=`${IFCONFIGBINARY} -l`
            ;;
            OpenBSD|Solaris)
                FIND=`${IFCONFIGBINARY} -a | ${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 (${OS}) to find available network interfaces"
            ;;
        esac
        if [ ! "${FIND}" = "" ]; then
            for I in ${FIND}; do
                NETWORK_INTERFACES="${NETWORK_INTERFACES}|${I}"
                LogText "Found network interface: ${I}"
                N=`expr ${N} + 1`
                Report "network_interface[]=${I}"
            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 --description "Get network MAC addresses"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""
        case ${OS} in
            AIX)
                FIND=`lscfg -vl ent* | fgrep "Network Address" | cut -d"." -f14 | awk '{ 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 | ${AWKBINARY} '{ if ($1=="ether") print $2 }' | sort -u`
                ;;
            Linux)
                if [ ! "${IFCONFIGBINARY}" = "" ]; then
                    FIND=`${IFCONFIGBINARY} -a | ${GREPBINARY} "HWaddr" | awk '{ if ($4=="HWaddr") print $5 }' | sort -u`
                  else
                    if [ ! "${IPBINARY}" = "" ]; then
                        LogText "Test: Using ip binary to gather hardware addresses"
                        FIND=`${IPBINARY} link | ${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 | awk '{ if ($1=="lladdr" || $1=="ether") print $2 }' | sort -u`
                ;;
            NetBSD)
                FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="address:") print $2 }' | sort -u`
                ;;
            OpenBSD)
                FIND=`${IFCONFIGBINARY} -A | awk '{ if ($1=="lladdr") print $2 }' | sort -u`
                ;;
            Solaris)
                FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="ether") print $2 }' | sort -u`
                ;;
            *)
                # Having a system currently unsupported? Share your details to determine MAC information
                ReportException "${TEST_NO}:1" "No support for this OS (${OS}) to find MAC information"
                ;;
        esac
        N=0
        for I in ${FIND}; do
            LogText "Found MAC address: ${I}"
            N=`expr ${N} + 1`
            Report "network_mac_address[]=${I}"
        done
    fi
#
#################################################################################
#
    # Test        : NETW-3008
    # Description : Get network IPv4/6 addresses
    Register --test-no NETW-3008 --weight L --network NO --description "Get network IP addresses"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""; FIND2=""
        case ${OS} in
            AIX)
                FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
                FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6") print $2 }'`
                ;;
            DragonFly|FreeBSD|NetBSD)
                FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
                FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6") print $2 }'`
                ;;
            Linux)
                if [ ! "${IFCONFIGBINARY}" = "" ]; then
                    FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }' | cut -d ':' -f2`
                    # Version which works for multiple types of ifconfig (e.g. Slackware)
                    FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6" && $2=="addr:") { print $3 } else { if ($1=="inet6" && $3=="prefixlen") { print $2 } } }'`
                  else
                    if [ ! "${IPBINARY}" = "" ]; then
                        LogText "Test: Using ip binary to gather IP addresses"
                        FIND=`${IPBINARY} addr | ${AWKBINARY} '{ if ($1=="inet") { print $2 }}' | sed 's/\/.*//'`
                        FIND2=`${IPBINARY} addr | ${AWKBINARY} '{ if ($1=="inet6") { print $2 }}' | sed 's/\/.*//'`
                      else
                        ReportException "${TEST_NO}:2" "Missing ifconfig or ip command to collect hardware address (MAC)"
                    fi
                fi
                ;;
            MacOS)
                FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
                FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6") print $2 }'`
                ;;
            OpenBSD)
                FIND=`${IFCONFIGBINARY} -A | awk '{ if ($1=="inet") print $2 }'`
                FIND2=`${IFCONFIGBINARY} -A | awk '{ if ($1=="inet6") print $2 }'`
                ;;
            Solaris)
                FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
                FIND2=`${IFCONFIGBINARY} -a | awk '{ 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
        N=0
        # IPv4
        for I in ${FIND}; do
            LogText "Found IPv4 address: ${I}"
            N=`expr ${N} + 1`
            Report "network_ipv4_address[]=${I}"
        done
        # IPv6
        for I in ${FIND2}; do
            LogText "Found IPv6 address: ${I}"
            N=`expr ${N} + 1`
            Report "network_ipv6_address[]=${I}"
        done

    fi
#
#################################################################################
#
    # Test        : NETW-3012
    # Description : Check listening ports
    Register --test-no NETW-3012 --weight L --network NO --description "Check listening ports"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=""; FIND2=""
        N=0
        case ${OS} in
            DragonFly|FreeBSD)
                if [ ! "${SOCKSTATBINARY}" = "" ]; then
                    FIND=`${SOCKSTATBINARY} | awk '{ if ($7 ~ /\*:\*/) print $5"|"$6"|"$2"|" }' | sort -u`
                    # To strip off IP's: sed 's/|.*:/|/'
                  else
                    FIND=""
                fi
                FIND2=""
                ;;
            Linux)
                if [ ! "${NETSTATBINARY}" = "" ]; then
                    # UDP
                    FIND=`${NETSTATBINARY} -nlp 2> /dev/null | grep "^udp" | awk '{ print $4"|"$1"|"$6"|" }' | sed 's:|[0-9]*/:|:'`
                    # TCP
                    FIND2=`${NETSTATBINARY} -nlp 2> /dev/null  | grep "^tcp" | awk '{ if($6=="LISTEN") { print $4"|"$1"|"$7"|" }}' | sed 's:|[0-9]*/:|:'`
                  else
                    if [ ! "${SSBINARY}" = "" ]; then
                        # UDP
                        FIND=`${SSBINARY} -u -a -n | awk '{ print $4 }' | grep -v Local`
                        # TCP
                        FIND2=`${SSBINARY} -t -a -n | awk '{ print $4 }' | grep -v Local`
                      else
                        ReportException "${TEST_NO}:1" "netstat and ss binary missing to gather listening ports"
                    fi
                fi
                ;;

            MacOS)
                if [ ! "${LSOFBINARY}" = "" ]; then
                    # UDP and TCP combined
                    FIND=`${LSOFBINARY} -i -P | awk '{ print $9"|"$8"|"$1"|" }' | sed 's/\(.*\)\-\>.*\(\|.*\)/\1\2/' | sed 's/\*/'$IP'/' | sort -u | grep -v "NAME"`
                  else
                    FIND=""
                fi
                # Not needed as we have a combined test
                FIND2=""
                ;;


            NetBSD)
                if [ ! "${SOCKSTATBINARY}" = "" ]; then
                    FIND=`${SOCKSTATBINARY} | awk '{ if ($7 ~ /\*.\*/) print $5"|"$6"|"$2"|" }' | sort -u`
                  else
                    FIND=""
                fi
                FIND2=""
                ;;
            OpenBSD)
                if [ ! "${NETSTATBINARY}" = "" ]; then
                    # UDP
                    FIND=`${NETSTATBINARY} -an 2> /dev/null | grep "^udp" | awk '{ print $4"|"$1"||" }'`
                    # TCP
                    FIND2=`${NETSTATBINARY} -an 2> /dev/null  | grep "^tcp" | awk '{ 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

        # Retrieve information from sockstat, when available
        LogText "Test: Retrieving sockstat information to find listening ports"
        if [ ! "${FIND}" = "" ]; then
            for I in ${FIND}; do
                N=`expr ${N} + 1`
                LogText "Found listening info: ${I}"
                Report "network_listen_port[]=${I}"
            done
        fi

        if [ ! "${FIND2}" = "" ]; then
            for I in ${FIND2}; do
                N=`expr ${N} + 1`
                LogText "Found listening info: ${I}"
                Report "network_listen_port[]=${I}"
            done
        fi
        if [ "${FIND}" = "" -a "${FIND2}" = "" ]; then
             Display --indent 2 --text "- Getting listening ports (TCP/UDP)" --result SKIPPED --color YELLOW
           else
             Display --indent 2 --text "- Getting listening ports (TCP/UDP)" --result DONE --color GREEN
             Display --indent 6 --text "* Found ${N} ports"
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3014
    # Description : Checking promiscuous interfaces (BSD)
    # Note        : FreeBSD and others
    if [ "${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 --description "Checking promiscuous interfaces (BSD)"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking promiscuous interfaces (FreeBSD)"
        FIND=`${IFCONFIGBINARY} | grep PROMISC | cut -d ':' -f1`
        if [ ! "${FIND}" = "" ]; then
            LogText "Result: Promiscuous interfaces: ${FIND}"
            for I in ${FIND}; do
                ISWHITELISTED=`grep "^if_promisc:${I}:" ${PROFILE}`
                if [ "${ISWHITELISTED}" = "" ]; then
                    FOUNDPROMISC=1
                    ReportWarning ${TEST_NO} "H" "Found promiscuous interface (${I})"
                    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
            done
        fi

        # Show result
        if [ ${FOUNDPROMISC} -eq 0 ]; then
            Display --indent 2 --text "- Checking promiscuous interfaces" --result OK --color GREEN
            LogText "Result: No promiscuous interfaces found"
          else
            Display --indent 2 --text "- Checking promiscuous interfaces" --result WARNING --color RED
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3015
    # Description : Checking promiscuous interfaces (Linux)
    # Note        : Need ifconfig binary at this moment (does not work on Arch Linux)
    if [ ! "${IFCONFIGBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-3015 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking promiscuous interfaces (Linux)"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking promiscuous interfaces (Linux)"
        NETWORK=`${IFCONFIGBINARY} | grep Link | tr -s ' ' | cut -d ' ' -f1`
        if [ ! "${NETWORK}" = "" ]; then
            for I in ${NETWORK}; do
                FIND=`${IFCONFIGBINARY} ${I} | grep PROMISC`
                if [ ! "${FIND}" = "" ]; then
                    LogText "Result: Promiscuous interface: ${I}"
                    ISWHITELISTED=`grep "^if_promisc:${I}:" ${PROFILE}`
                    if [ "${ISWHITELISTED}" = "" ]; then
                        FOUNDPROMISC=1
                        ReportWarning ${TEST_NO} "H" "Found promiscuous interface (${I})"
                        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
        fi

        # Show result
        if [ ${FOUNDPROMISC} -eq 0 ]; then
            Display --indent 2 --text "- Checking promiscuous interfaces" --result OK --color GREEN
            LogText "Result: No promiscuous interfaces found"
          else
            Display --indent 2 --text "- Checking promiscuous interfaces" --result WARNING --color RED
        fi
    fi
#
#################################################################################
#
    # Test        : NETW-3020
    # Description : Checking multipath configuration (Solaris)
#
#################################################################################
#
    # Test        : NETW-3024
    # Description : Netstat/socktstat compare (FreeBSD)
    #	    echo -n "        - Comparing output sockstat and netstat"
    #	    LogText "Comparing output of sockstat and netstat"
    #	    NETSTATOUTPUT=`netstat -an | grep -v 'TIME_WAIT' | grep -v 'ESTABLISHED' | grep -v 'SYN_SENT' | grep -v 'CLOSE_WAIT' | grep -v 'LAST_ACK' | grep -v 'SYN_RECV' | grep -v 'CLOSING' | cut -c 1-44 | grep '*.' | cut -c 24-32 | tr -d ' ' | tr -d '\t' | grep -v '*' | sort -u`
    #
    #	    if [ "${SOCKSTATOUTPUT}" = "${NETSTATOUTPUT}" ]; then
    #	        ShowResult OK
    #	      else
    #	        echo "[ ${BAD}Warning!${NORMAL} ]"
    #		LogText "WARNING!"
    #		LogText "Sockstat tested output: ${SOCKSTAT}"
    #		LogText "Netstat tested output: ${NETSTAT}"
    #	    fi
#
#################################################################################
#
    # Test        : NETW-3028
    # Description : Checking for many waiting connections
    # Type        : Performance
    # Notes       : It is common to see a healthy web server seeing to have several thousands of TCP connections in WAIT state
    if [ ! "${NETSTATBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no NETW-3028 --preqs-met ${PREQS_MET} --weight L --network NO --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 | grep WAIT | wc -l | awk '{ print $1 }'`
        if [ "${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 ${OPTIONS_CONN_MAX_WAIT_STATE} ]; then
            Display --indent 2 --text "- Checking waiting connections" --result WARNING --color YELLOW
            ReportSuggestion "${TEST_NO}" "Determine why system has many connections in WAIT state (${FIND})"
          else
            Display --indent 2 --text "- Checking waiting connections" --result 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 --description "Checking DHCP client status"
    if [ ${SKIPTEST} -eq 0 ]; then
        IsRunning dhclient
        if [ ${RUNNING} -eq 1 ]; then
            Display --indent 2 --text "- Checking status DHCP client" --result 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 --description "Checking for ARP monitoring software"
    if [ ${SKIPTEST} -eq 0 ]; then
        IsRunning arpwatch
        if [ ${RUNNING} -eq 1 ]; then
            ARPWATCH_RUNNING=1
            Display --indent 2 --text "- Checking for ARP monitoring software" --result RUNNING --color GREEN
          else
            Display --indent 2 --text "- Checking for ARP monitoring software" --result "NOT FOUND" --color YELLOW
            ReportSuggestion ${TEST_NO} "Install ARP monitoring software like arpwatch"
        fi
    fi
#
#################################################################################
#

report "dhcp_client_running=${DHCP_CLIENT_RUNNING}"
report "arpwatch_running=${ARPWATCH_RUNNING}"

wait_for_keypress

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