mirror of https://github.com/CISOfy/lynis.git
457 lines
22 KiB
Bash
457 lines
22 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 2007-2014, 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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# Networking
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#
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#################################################################################
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#
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FOUNDPROMISC=0 # Promiscuous interfaces
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LOCAL_DNSRESOLVER_FOUND=0 # Local DNS resolver
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NUMBERACTIVENS=0 # Number of active nameservers
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DHCP_CLIENT_RUNNING=0 # DHCP client availability
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#
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#################################################################################
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#
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InsertSection "Networking"
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#
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#################################################################################
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#
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# Test : NETW-2704 (YYY move to nameservices section)
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# Description : Basic nameserver configuration tests (connectivity)
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Register --test-no NETW-2704 --weight L --network YES --description "Basic nameserver configuration tests"
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if [ ${SKIPTEST} -eq 0 ]; then
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Display --indent 2 --text "- Checking configured nameservers..."
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logtext "Test: Checking /etc/resolv.conf file"
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if [ -f /etc/resolv.conf ]; then
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logtext "Result: Found /etc/resolv.conf file"
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FIND=`grep '^nameserver' /etc/resolv.conf | tr -d '\t' | sed 's/nameserver*//g'`
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if [ ! "${FIND}" = "" ]; then
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Display --indent 4 --text "- Testing nameservers..."
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logtext "Test: Querying nameservers"
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for I in ${FIND}; do
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logtext "Found nameserver: ${I}"
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report "nameserver[]=${I}"
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# Check if a local resolver is available (like DNSMasq)
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if [ "${I}" = "::1" -o "${I}" = "127.0.0.1" -o "${I}" = "0.0.0.0" ]; then
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LOCAL_DNSRESOLVER_FOUND=1
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fi
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if [ ! "${DIGBINARY}" = "" ]; then
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# See if we can query something at the nameserver
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# 0=good, other=bad
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DNSRESPONSE=`${DIGBINARY} +noall +time=3 +retry=0 @${I} ${I} > /dev/null ; echo $?`
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if [ "${DNSRESPONSE}" = "0" ]; then
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Display --indent 8 --text "Nameserver: ${I}..." --result OK --color GREEN
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logtext "Nameserver ${I} seems to respond to queries from this host."
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# Count responsive nameservers
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NUMBERACTIVENS=`expr ${NUMBERACTIVENS} + 1`
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else
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Display --indent 8 --text "Nameserver: ${I}..." --result "NO RESPONSE" --color RED
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logtext "Result: nameserver ${I} does NOT respond"
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logtext "Exit-code from dig: ${DNSRESPONSE}"
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ReportSuggestion ${TEST_NO} "Check connection to this nameserver and make sure no outbound DNS queries are blocked (port 53 UDP and TCP)."
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ReportWarning ${TEST_NO} "L" "Nameserver ${I} does not respond"
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fi
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else
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logtext "Result: Nameserver test for ${I} skipped, 'dig' not installed"
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Display --indent 6 --text "Nameserver: ${I}... " --result SKIPPED --color YELLOW
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fi
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done
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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 : NETW-2705
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# Description : Basic nameserver configuration tests (connectivity)
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if [ ${LOCAL_DNSRESOLVER_FOUND} -eq 0 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no NETW-2705 --preqs-met ${PREQS_MET} --weight L --network YES --description "Check availability two nameservers"
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if [ ${SKIPTEST} -eq 0 ]; then
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if [ ! "${DIGBINARY}" = "" ]; then
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if [ ${NUMBERACTIVENS} -lt 2 ]; then
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Display --indent 4 --text "- Minimal of 2 responsive nameservers..." --result WARNING --color RED
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logtext "Result: less than 2 responsive nameservers found"
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ReportWarning ${TEST_NO} "L" "Couldn't find 2 responsive nameservers"
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logtext "Note: Non responsive nameservers can give problems for your system(s). Like the lack of recursive lookups, bad connectivity to update servers etc."
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ReportSuggestion ${TEST_NO} "Check your resolv.conf file and fill in a backup nameserver if possible"
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AddHP 1 2
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else
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Display --indent 4 --text "- Minimal of 2 responsive nameservers..." --result OK --color GREEN
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logtext "Result: found at least 2 responsive nameservers"
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AddHP 3 3
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fi
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else
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Display --indent 4 --text "- Minimal of 2 responsive nameservers..." --result SKIPPED --color YELLOW
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logtext "Result: dig not installed, test can't be fully performed"
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fi
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else
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logtext "Result: Test most likely skipped due having local resolver in /etc/resolv.conf"
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fi
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#
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#################################################################################
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#
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# Test : NETW-3001
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# Description : Find default gateway (route)
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# More info : BSD: ^default Linux: 0.0.0.0
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if [ ! "${NETSTATBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no NETW-3001 --preqs-met ${PREQS_MET} --weight L --network NO --description "Find default gateway (route)"
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if [ $SKIPTEST -eq 0 ]; then
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logtext "Test: Searching default gateway(s)..."
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FIND=`${NETSTATBINARY} -rn | egrep "^0.0.0.0|default" | tr -s ' ' | cut -d ' ' -f2`
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if [ ! "${FIND}" = "" ]; then
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for I in ${FIND}; do
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logtext "Result: Found default gateway ${I}"
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report "default_gateway[]=${I}"
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done
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Display --indent 2 --text "- Checking default gateway..." --result DONE --color GREEN
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else
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logtext "Result: No default gateway found"
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Display --indent 2 --text "- Checking default gateway..." --result "NONE 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 : NETW-3004
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# Description : Find available network interfaces on FreeBSD and others
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if [ "${OS}" = "DragonFly" -o "${OS}" = "FreeBSD" -o "${OS}" = "NetBSD" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no NETW-3004 --preqs-met ${PREQS_MET} --weight L --network NO --description "Search available network interfaces on FreeBSD and others"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=`${IFCONFIGBINARY} -l`
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N=0
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for I in ${FIND}; do
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logtext "Found network interface: ${I}"
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N=`expr ${N} + 1`
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report "network_interface[]=${I}"
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done
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fi
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#
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#################################################################################
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#
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# Test : NETW-3006
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# Description : Get network MAC addresses
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Register --test-no NETW-3006 --weight L --network NO --description "Get network MAC addresses"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=""
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case ${OS} in
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AIX)
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FIND=`lscfg -vl ent* | fgrep "Network Address" | cut -d"." -f14 | awk '{ ctr=1; i=1; while (ctr <= 6) { d[ctr++]=substr($0,i,2);i=i+2 } printf("%s:%s:%s:%s:%s:%s\n",d[1],d[2],d[3],d[4],d[5],d[6]) }'`
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;;
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DragonFly|FreeBSD)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="ether") print $2 }' | sort | uniq`
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;;
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Linux)
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FIND=`${IFCONFIGBINARY} -a | grep "HWaddr" | awk '{ if ($4=="HWaddr") print $5 }' | sort | uniq`
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;;
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MacOS)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="lladdr" || $1=="ether") print $2 }' | sort | uniq`
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;;
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NetBSD)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="address:") print $2 }' | sort | uniq`
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;;
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OpenBSD)
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FIND=`${IFCONFIGBINARY} -A | awk '{ if ($1=="lladdr") print $2 }' | sort | uniq`
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;;
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Solaris)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="ether") print $2 }' | sort | uniq`
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;;
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*)
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# Having a system currently unsupported? Share your details to determine MAC information
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ReportException "${TEST_NO}:1" "No support for this OS (${OS}) to find MAC information"
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;;
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esac
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N=0
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for I in ${FIND}; do
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logtext "Found MAC address: ${I}"
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N=`expr ${N} + 1`
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report "network_mac_address[]=${I}"
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done
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fi
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#
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#################################################################################
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#
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# Test : NETW-3008
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# Description : Get network IPv4/6 addresses
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Register --test-no NETW-3008 --weight L --network NO --description "Get network IP addresses"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=""; FIND2=""
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case ${OS} in
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AIX)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
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# IPv6 support in AIX? (YYY)
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;;
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DragonFly|FreeBSD|NetBSD)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
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FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6") print $2 }'`
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;;
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Linux)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }' | cut -d ':' -f2`
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# Version which works for multiple types of ifconfig (e.g. Slackware)
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FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6" && $2=="addr:") { print $3 } else { if ($1=="inet6" && $3=="prefixlen") { print $2 } } }'`
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;;
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MacOS)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
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FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6") print $2 }'`
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;;
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OpenBSD)
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FIND=`${IFCONFIGBINARY} -A | awk '{ if ($1=="inet") print $2 }'`
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FIND2=`${IFCONFIGBINARY} -A | awk '{ if ($1=="inet6") print $2 }'`
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;;
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Solaris)
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FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet") print $2 }'`
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FIND2=`${IFCONFIGBINARY} -a | awk '{ if ($1=="inet6") print $2 }'`
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;;
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*)
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logtext "Warning: no support yet for this OS (${OS}) to find IP address information"
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ReportException "${TEST_NO}:1" "IP address information test not implemented for this operating system"
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;;
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esac
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N=0
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# IPv4
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for I in ${FIND}; do
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logtext "Found IPv4 address: ${I}"
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N=`expr ${N} + 1`
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report "network_ipv4_address[]=${I}"
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done
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# IPv6
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for I in ${FIND2}; do
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logtext "Found IPv6 address: ${I}"
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N=`expr ${N} + 1`
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report "network_ipv6_address[]=${I}"
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done
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fi
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#
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#################################################################################
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#
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# Test : NETW-3012
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# Description : Check listening ports
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Register --test-no NETW-3012 --weight L --network NO --description "Check listening ports"
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if [ ${SKIPTEST} -eq 0 ]; then
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FIND=""; FIND2=""
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N=0
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case ${OS} in
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DragonFly|FreeBSD)
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if [ ! "${SOCKSTATBINARY}" = "" ]; then
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FIND=`${SOCKSTATBINARY} | awk '{ if ($7 ~ /\*:\*/) print $5"|"$6"|"$2"|" }' | sort | uniq`
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# To strip off IP's: sed 's/|.*:/|/'
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else
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FIND=""
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fi
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FIND2=""
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;;
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Linux)
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if [ ! "${NETSTATBINARY}" = "" ]; then
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# UDP
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FIND=`${NETSTATBINARY} -nlp | grep "^udp" | awk '{ print $4"|"$1"|"$6"|" }' | sed 's:|[0-9]*/:|:'`
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# TCP
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FIND2=`${NETSTATBINARY} -nlp | grep "^tcp" | awk '{ if($6=="LISTEN") { print $4"|"$1"|"$7"|" }}' | sed 's:|[0-9]*/:|:'`
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else
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ReportException "${TEST_NO}:1" "netstat binary is missing"
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fi
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;;
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NetBSD)
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if [ ! "${SOCKSTATBINARY}" = "" ]; then
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FIND=`${SOCKSTATBINARY} | awk '{ if ($7 ~ /\*.\*/) print $5"|"$6"|"$2"|" }' | sort | uniq`
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else
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FIND=""
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fi
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FIND2=""
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;;
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*)
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# Got this exception? Provide your details and output of netstat or any other tool to determine this information.
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ReportException "${TEST_NO}:2" "Unclear what method to use, to determine listening port information"
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;;
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esac
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# Retrieve information from sockstat, when available
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logtext "Test: Retrieving sockstat information to find listening ports..."
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if [ ! "${FIND}" = "" ]; then
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for I in ${FIND}; do
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N=`expr ${N} + 1`
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logtext "Found listening info: ${I}"
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report "network_listen_port=${I}"
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done
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fi
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if [ ! "${FIND2}" = "" ]; then
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for I in ${FIND2}; do
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N=`expr ${N} + 1`
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logtext "Found listening info: ${I}"
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report "network_listen_port=${I}"
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done
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fi
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if [ "${FIND}" = "" -a "${FIND2}" = "" ]; then
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Display --indent 2 --text "- Getting listening ports (TCP/UDP)..." --result SKIPPED --color YELLOW
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else
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Display --indent 2 --text "- Getting listening ports (TCP/UDP)..." --result DONE --color GREEN
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Display --indent 6 --text "* Found ${N} ports"
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fi
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fi
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#
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#################################################################################
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#
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# Test : NETW-3014
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# Description : Checking promiscuous interfaces (BSD)
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# Note : FreeBSD and others
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if [ "${OS}" = "DragonFly" -o "${OS}" = "FreeBSD" -o "${OS}" = "NetBSD" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no NETW-3014 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking promiscuous interfaces (BSD)"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: Checking promiscuous interfaces (FreeBSD)..."
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FIND=`${IFCONFIGBINARY} | grep PROMISC | cut -d ':' -f1`
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if [ ! "${FIND}" = "" ]; then
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logtext "Result: Promiscuous interfaces: ${FIND}"
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for I in ${FIND}; do
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ISWHITELISTED=`grep "^if_promisc:${I}:" ${PROFILE}`
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if [ "${ISWHITELISTED}" = "" ]; then
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FOUNDPROMISC=1
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ReportWarning ${TEST_NO} "H" "Found promiscuous interface (${I})"
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logtext "Note: some tools put an interface into promiscuous mode, to capture/log network traffic"
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else
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logtext "Result: Found promiscuous interface ${I} (*whitelisted via profile*)"
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fi
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done
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fi
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# Show result
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if [ ${FOUNDPROMISC} -eq 0 ]; then
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Display --indent 2 --text "- Checking promiscuous interfaces..." --result OK --color GREEN
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logtext "Result: No promiscuous interfaces found"
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else
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Display --indent 2 --text "- Checking promiscuous interfaces..." --result WARNING --color RED
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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 : NETW-3015
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# Description : Checking promiscuous interfaces (Linux)
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# Note : Linux
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Register --test-no NETW-3015 --os Linux --weight L --network NO --description "Checking promiscuous interfaces (Linux)"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: Checking promiscuous interfaces (Linux)"
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NETWORK=`${IFCONFIGBINARY} | grep Link | tr -s ' ' | cut -d ' ' -f1`
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if [ ! "${NETWORK}" = "" ]; then
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for I in ${NETWORK}; do
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FIND=`${IFCONFIGBINARY} ${I} | grep PROMISC`
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if [ ! "${FIND}" = "" ]; then
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logtext "Result: Promiscuous interface: ${I}"
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ISWHITELISTED=`grep "^if_promisc:${I}:" ${PROFILE}`
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if [ "${ISWHITELISTED}" = "" ]; then
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FOUNDPROMISC=1
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ReportWarning ${TEST_NO} "H" "Found promiscuous interface (${I})"
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logtext "Note: some tools put an interface into promiscuous mode, to capture/log network traffic"
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else
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logtext "Result: Found promiscuous interface ${I} (*whitelisted via profile*)"
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fi
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fi
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done
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fi
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# Show result
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if [ ${FOUNDPROMISC} -eq 0 ]; then
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Display --indent 2 --text "- Checking promiscuous interfaces..." --result OK --color GREEN
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logtext "Result: No promiscuous interfaces found"
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else
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Display --indent 2 --text "- Checking promiscuous interfaces..." --result WARNING --color RED
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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 : NETW-3020
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# Description : Checking multipath configuration (Solaris)
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#
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#################################################################################
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#
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# Test : NETW-3024
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# Description : Netstat/socktstat compare (FreeBSD)
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# echo -n " - Comparing output sockstat and netstat... "
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# logtext "Comparing output of sockstat and netstat... "
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# 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 | uniq`
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#
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# if [ "${SOCKSTATOUTPUT}" = "${NETSTATOUTPUT}" ]; then
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# ShowResult OK
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# else
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# echo "[ ${BAD}Warning!${NORMAL} ]"
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# logtext "WARNING!"
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# logtext "Sockstat tested output: ${SOCKSTAT}"
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# logtext "Netstat tested output: ${NETSTAT}"
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# fi
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#
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#################################################################################
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#
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# Test : NETW-3028
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# Description : Checking for many waiting connections
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# Type : Performance
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if [ ! "${NETSTATBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no NETW-3028 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking connections in WAIT state"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: Using netstat for check for connections in WAIT state..."
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FIND=`${NETSTATBINARY} -an | grep WAIT | wc -l | awk '{ print $1 }'`
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if [ "${OPTIONS_CONN_MAX_WAIT_STATE}" = "" ]; then OPTIONS_CONN_MAX_WAIT_STATE="100"; fi
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logtext "Result: currently ${FIND} connections are in a waiting state (max configured: ${OPTIONS_CONN_MAX_WAIT_STATE})."
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if [ ${FIND} -gt ${OPTIONS_CONN_MAX_WAIT_STATE} ]; then
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Display --indent 2 --text "- Checking waiting connections..." --result WARNING --color YELLOW
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ReportWarning ${TEST_NO} "H" "Found too much connections in WAIT state (${FIND})"
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else
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Display --indent 2 --text "- Checking waiting connections..." --result OK --color GREEN
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logtext "Result: ${FIND} connections are in WAIT state"
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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 : NETW-3030
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# Description : Checking for DHCP client
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Register --test-no NETW-3030 --weight L --network NO --description "Checking DHCP client status"
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if [ ${SKIPTEST} -eq 0 ]; then
|
|
IsRunning dhclient
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|
if [ ${RUNNING} -eq 1 ]; then
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|
Display --indent 2 --text "- Checking status DHCP client..." --result RUNNING --color WHITE
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|
#YYY report if system type is server, that it is running with DHCP client, might be a badly configured machine
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|
#report "manual[]=System is running DHCP client"
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|
DHCP_CLIENT_RUNNING=1
|
|
else
|
|
Display --indent 2 --text "- Checking status DHCP client..." --result "NOT ACTIVE" --color WHITE
|
|
fi
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : NETW-3060
|
|
# Description : Check if IPv6 is configured AND used
|
|
# /etc/modprobe.d (add 'install ipv6 /bin/true' if IPv6 isn't used)
|
|
# or
|
|
# aliased (/etc/modprobe.d/aliases?): alias net-pf-10 off ipv6 (to disable)
|
|
#Register --test-no NETW-3060 --weight L --network NO --description "Checking IPv6 connectivity"
|
|
#if [ ${SKIPTEST} -eq 0 ]; then
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Linux: net.ipv4.ip_always_defrag
|
|
#
|
|
#################################################################################
|
|
#
|
|
|
|
report "dhcp_client_running=${DHCP_CLIENT_RUNNING}"
|
|
wait_for_keypress
|
|
|
|
#
|
|
#================================================================================
|
|
# Lynis - Copyright 2007-2014, Michael Boelen - www.rootkit.nl - The Netherlands
|