#!/bin/sh ################################################################################# # # Lynis # ------------------ # # Copyright 2007-2015, Michael Boelen (michael@rootkit.nl), The Netherlands # Web site: http://www.rootkit.nl # # 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 # ################################################################################# # InsertSection "Networking" # ################################################################################# # # Test : NETW-2704 (YYY move to nameservices section) # 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 if [ "${OS}" = "DragonFly" -o "${OS}" = "FreeBSD" -o "${OS}" = "NetBSD" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no NETW-3004 --preqs-met ${PREQS_MET} --weight L --network NO --description "Search available network interfaces on FreeBSD and others" if [ ${SKIPTEST} -eq 0 ]; then FIND=`${IFCONFIGBINARY} -l` N=0 for I in ${FIND}; do logtext "Found network interface: ${I}" N=`expr ${N} + 1` report "network_interface[]=${I}" done 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 $2 }' | sort | uniq` ;; Linux) if [ ! "${IFCONFIGBINARY}" = "" ]; then FIND=`${IFCONFIGBINARY} -a | ${GREPBINARY} "HWaddr" | awk '{ if ($4=="HWaddr") print $5 }' | sort | uniq` else if [ ! "${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 $2 }' | sort | uniq` ;; NetBSD) FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="address:") print $2 }' | sort | uniq` ;; OpenBSD) FIND=`${IFCONFIGBINARY} -A | awk '{ if ($1=="lladdr") print $2 }' | sort | uniq` ;; Solaris) FIND=`${IFCONFIGBINARY} -a | awk '{ if ($1=="ether") print $2 }' | sort | uniq` ;; *) # Having a system currently unsupported? Share your details to determine MAC information ReportException "${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 $2 }'` # IPv6 support in AIX? (YYY) ;; DragonFly|FreeBSD|NetBSD) FIND=`${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"|"$2"|" }' | sort | uniq` # To strip off IP's: sed 's/|.*:/|/' else FIND="" fi FIND2="" ;; Linux) if [ ! "${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"|"$2"|" }' | sort | uniq` else FIND="" fi FIND2="" ;; OpenBSD) if [ ! "${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 [ ${FOUNDPROMISC} -eq 0 ]; then Display --indent 2 --text "- Checking promiscuous interfaces" --result OK --color GREEN logtext "Result: No promiscuous interfaces found" else Display --indent 2 --text "- Checking promiscuous interfaces" --result WARNING --color RED fi fi # ################################################################################# # # Test : NETW-3020 # Description : Checking multipath configuration (Solaris) # ################################################################################# # # Test : NETW-3024 # Description : Netstat/socktstat compare (FreeBSD) # echo -n " - Comparing output sockstat and netstat" # logtext "Comparing output of sockstat and netstat" # NETSTATOUTPUT=`netstat -an | grep -v 'TIME_WAIT' | grep -v 'ESTABLISHED' | grep -v 'SYN_SENT' | grep -v 'CLOSE_WAIT' | grep -v 'LAST_ACK' | grep -v 'SYN_RECV' | grep -v 'CLOSING' | cut -c 1-44 | grep '*.' | cut -c 24-32 | tr -d ' ' | tr -d '\t' | grep -v '*' | sort | uniq` # # if [ "${SOCKSTATOUTPUT}" = "${NETSTATOUTPUT}" ]; then # ShowResult OK # else # echo "[ ${BAD}Warning!${NORMAL} ]" # logtext "WARNING!" # logtext "Sockstat tested output: ${SOCKSTAT}" # logtext "Netstat tested output: ${NETSTAT}" # fi # ################################################################################# # # Test : NETW-3028 # Description : Checking for many waiting connections # Type : Performance if [ ! "${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="100"; 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 ReportWarning ${TEST_NO} "H" "Found too much connections in WAIT state (${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 #YYY report if system type is server, that it is running with DHCP client, might be a badly configured machine #report "manual[]=System is running DHCP client" 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 2007-2015, Michael Boelen - www.rootkit.nl - The Netherlands