#!/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. # ################################################################################# # # Time # ################################################################################# # InsertSection "Time and Synchronization" # ################################################################################# # NTP_DAEMON="" NTP_DAEMON_RUNNING=0 NTP_CONFIG_FOUND=0 NTP_CONFIG_TYPE_DAEMON=0 NTP_CONFIG_TYPE_SCHEDULED=0 NTP_CONFIG_TYPE_EVENTBASED=0 NTP_CONFIG_TYPE_STARTUP=0 # Specific for ntpd NTPD_RUNNING=0 CRON_DIRS="/etc/cron.d /etc/cron.hourly /etc/cron.daily /etc/cron.weekly /etc/cron.monthly /var/spool/crontabs" # ################################################################################# # # Test : TIME-3104 # Description : Check for a running NTP daemon if [ -f /sys/hypervisor/type ]; then # Skip NTP tests if we are in a DomU xen instance YYY FIND=`cat /sys/hypervisor/type` if [ "${FIND}" = "xen" ]; then PREQS_MET="NO"; else PREQS_MET="YES"; fi else PREQS_MET="YES" fi Register --test-no TIME-3104 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check for running NTP daemon or client" if [ ${SKIPTEST} -eq 0 ]; then # Linux/FreeBSD (ntpdate), OpenBSD (ntpd, rdate) logtext "Test: Searching for a running NTP daemon or available client" FOUND=0 # Check running processes FIND=`${PSBINARY} ax | grep "ntpd" | grep -v "dntpd" | grep -v "grep"` if [ ! "${FIND}" = "" ]; then FOUND=1; NTPD_RUNNING=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1 NTP_DAEMON="ntpd" logtext "Result: found running NTP daemon in process list" Display --indent 2 --text "- NTP daemon found: ntpd" --result FOUND --color GREEN fi # Check time daemon (eg NetBSD) IsRunning timed if [ ${RUNNING} -eq 1 ]; then FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="timed" Display --indent 2 --text "- NTP daemon found: timed" --result FOUND --color GREEN fi # Check time daemon (eg DragonFly BSD) IsRunning dntpd if [ ${RUNNING} -eq 1 ]; then FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="dntpd" Display --indent 2 --text "- NTP daemon found: dntpd" --result FOUND --color GREEN fi # Check timedate daemon (systemd) if [ ! "${TIMEDATECTL}" = "" ]; then FIND=`${TIMEDATECTL} status | grep "NTP enabled: yes"` if [ ! "${FIND}" = "" ]; then FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="timedated" Display --indent 2 --text "- NTP daemon found: timedated" --result "FOUND" --color GREEN fi fi # Check crontab for OpenBSD/FreeBSD # Check anacrontab for Linux CRONTAB_FILES="/etc/anacrontab /etc/crontab" for I in ${CRONTAB_FILES}; do if [ -f ${I} ]; then logtext "Test: checking for ntpdate or rdate in crontab file ${I}" FIND=`cat ${I} | ${EGREPBINARY} "ntpdate|rdate" | grep -v '^#'` if [ ! "${FIND}" = "" ]; then FOUND=1; NTP_CONFIG_TYPE_SCHEDULED=1 Display --indent 2 --text "- Checking NTP client in crontab file (${I})" --result FOUND --color GREEN logtext "Result: found ntpdate or rdate reference in crontab file ${I}" else Display --indent 2 --text "- Checking NTP client in crontab file (${I})" --result "NOT FOUND" --color WHITE logtext "Result: no ntpdate or rdate reference found in crontab file ${I}" fi else logtext "Result: crontab file ${I} not found" fi done ########################## # To do: test on Solaris # ########################## # Don't run check in cron job directory on Solaris # /etc/cron.d/FIFO is a special file and test get stuck at this file FOUND_IN_CRON=0 # Check cron jobs for I in ${CRON_DIRS}; do if [ -d ${I} ]; then FIND=`ls ${I} | grep -v FIFO` if [ ! "${FIND}" = "" ]; then for J in ${FIND}; do logtext "Test: checking for ntpdate or rdate in ${I}/${J}" FIND2=`${EGREPBINARY} "rdate|ntpdate" ${I}/${J} | grep -v "^#"` if [ ! "${FIND2}" = "" ]; then logtext "Positive match found: ${FIND2}" FOUND=1; FOUND_IN_CRON=1; NTP_CONFIG_TYPE_SCHEDULED=1 fi done else logtext "Result: ${I} is empty, skipping search in directory" fi fi done if [ ${FOUND_IN_CRON} -eq 1 ]; then Display --indent 2 --text "- Checking NTP client in cron files" --result FOUND --color GREEN logtext "Result: found ntpdate or rdate in cron directory" else Display --indent 2 --text "- Checking NTP client in cron.d files" --result "NOT FOUND" --color WHITE logtext "Result: no ntpdate or rdate found in cron directories" fi # Checking if ntpdate is performed by event logtext "Test: checking for file /etc/network/if-up.d/ntpdate" if [ -f /etc/network/if-up.d/ntpdate ]; then logtext "Result: found ntpdate action when network interface comes up" FOUND=1 NTP_CONFIG_TYPE_EVENTBASED=1 Display --indent 2 --text "- Checking event based ntpdate (if-up)" --result FOUND --color GREEN else logtext "Result: file /etc/network/if-up.d/ntpdate does not exist" fi # Configuration file for *BSD if [ -f /etc/rc.conf ]; then logtext "Test: Checking if ntpdate is enabled at startup in *BSD" FIND=`grep 'ntpdate_enable="YES"' /etc/rc.conf` if [ ! "${FIND}" = "" ]; then logtext "Result: ntpdate is enabled in rc.conf" # Mark system having a NTP client, but remind user to improve it FOUND=1 NTP_CONFIG_TYPE_STARTUP=1 ReportSuggestion ${TEST_NO} "Although ntpdate is enabled in rc.conf, it is adviced to run it at least daily or use a NTP daemon" else logtext "Result: ntpdate is not enabled in rc.conf" fi fi if [ ${FOUND} -eq 0 ]; then if [ ${ISVIRTUALMACHINE} -eq 1 ]; then logtext "Result: Skipping display warning, as virtual machines usually don't need time synchronization in the VM itself" else Display --indent 2 --text "- Checking for a running NTP daemon or client" --result WARNING --color RED logtext "Result: Could not find a NTP daemon or client" ReportSuggestion ${TEST_NO} "Use NTP daemon or NTP client to prevent time issues." AddHP 0 2 fi else Display --indent 2 --text "- Checking for a running NTP daemon or client" --result OK --color GREEN logtext "Result: Found a time syncing daemon/client." AddHP 3 3 fi fi # ################################################################################# # # Test : TIME-3112 # Description : Check for valid associations from ntpq peers list if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3112 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check active NTP associations ID's" if [ ${SKIPTEST} -eq 0 ]; then logtext "Test: Checking for NTP association ID's from ntpq peers list" FIND=`${NTPQBINARY} -p -n | grep "No association ID's returned"` if [ "${FIND}" = "" ]; then Display --indent 2 --text "- Checking valid association ID's" --result FOUND --color GREEN logtext "Result: Found one or more association ID's" else Display --indent 2 --text "- Checking valid association ID's" --result WARNING --color RED ReportSuggestion ${TEST_NO} "Check ntp.conf for properly configured NTP servers and a correctly functioning name service." fi fi # ################################################################################# # # Test : TIME-3116 # Description : Check for stratum 16 peers if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3116 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check peers with stratum value of 16" if [ ${SKIPTEST} -eq 0 ]; then N=0 logtext "Test: Checking stratum 16 sources from ntpq peers list" FIND=`${NTPQBINARY} -p -n | awk '{ if ($3=="16") { print $1 } }'` if [ "${FIND}" = "" ]; then Display --indent 2 --text "- Checking high stratum ntp peers" --result OK --color GREEN logtext "Result: All peers are lower than stratum 16" else for I in ${FIND}; do logtext "Found stratum 16 peer: ${I}" FIND2=`egrep "^ntp:ignore_stratum_16_peer:${I}:" ${PROFILE}` if [ "${FIND2}" = "" ]; then N=`expr ${N} + 1` else logtext "Output: host ${I} ignored by profile" fi done # Check if one or more high stratum time servers are found if [ ${N} -eq 0 ]; then Display --indent 2 --text "- Checking high stratum ntp peers" --result OK --color GREEN logtext "Result: all non local servers are lower than stratum 16, or whitelisted within the scan profile" else Display --indent 2 --text "- Checking high stratum ntp peers" --result WARNING --color RED logtext "Result: Found one or more high stratum (16) peers)" ReportSuggestion ${TEST_NO} "Check ntpq peers output" ReportWarning ${TEST_NO} "L" "Found one or more stratum 16 peers" fi fi fi # ################################################################################# # # Test : TIME-3120 # Description : Check unreliable peers from peer list # Notes : Items with # are too far away (network distance) # Items with - are not chosing due clustering algoritm if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3120 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check unreliable NTP peers" if [ ${SKIPTEST} -eq 0 ]; then logtext "Test: Checking unreliable ntp peers" FIND=`${NTPQBINARY} -p -n | egrep "^(-|#)" | awk '{ print $1 }' | sed 's/^-//g'` if [ "${FIND}" = "" ]; then Display --indent 2 --text "- Checking unreliable ntp peers" --result NONE --color GREEN logtext "Result: No unreliable peers found" else Display --indent 2 --text "- Checking unreliable ntp peers" --result FOUND --color YELLOW logtext "Result: Found one or more unreliable peers (marked with a minus or dash sign)" for I in ${FIND}; do logtext "Unreliable peer: ${I}" done ReportSuggestion ${TEST_NO} "Check ntpq peers output for unreliable ntp peers and correct/replace them" fi fi # ################################################################################# # # Test : TIME-3124 # Description : Check selected time source if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3124 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check selected time source" if [ ${SKIPTEST} -eq 0 ]; then logtext "Test: Checking selected time source" FIND=`${NTPQBINARY} -p -n | grep '^*' | awk '{ if ($4=="l") { print $1 } }'` FIND2=`${NTPQBINARY} -p -n | grep '^*' | awk '{ print $1 }'` if [ "${FIND}" = "" -a ! "${FIND2}" = "" ]; then Display --indent 2 --text "- Checking selected time source" --result OK --color GREEN FIND2=`echo ${FIND2} | sed 's/*//g'` logtext "Result: Found selected time source (value: ${FIND2})" else Display --indent 2 --text "- Checking selected time source" --result WARNING --color RED logtext "Result: Found local source as selected time source. This could indicate that no external sources are available to sync with." logtext "Local source: ${FIND}" ReportSuggestion ${TEST_NO} "Check ntpq peers output for selected time source" fi fi # ################################################################################# # # Test : TIME-3128 # Description : Check time source candidates if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3128 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check preffered time source" if [ ${SKIPTEST} -eq 0 ]; then logtext "Test: Checking preferred time source" FIND=`${NTPQBINARY} -p -n | grep '^+' | awk '{ print $1 }'` if [ "${FIND}" = "" ]; then Display --indent 2 --text "- Checking time source candidates" --result NONE --color YELLOW logtext "Result: No other time source candidates found" ReportSuggestion ${TEST_NO} "Check ntpq peers output for time source candidates" else Display --indent 2 --text "- Checking time source candidates" --result OK --color GREEN logtext "Result: Found one or more candidates to synchronize time with." for I in ${FIND}; do I=`echo ${I} | sed 's/+//g'` logtext "Candidate found: ${I}" done fi fi # ################################################################################# # # Test : TIME-3132 # Description : Check ntpq falsetickers if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3132 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check NTP falsetickers" if [ ${SKIPTEST} -eq 0 ]; then logtext "Test: Checking preferred time source" FIND=`${NTPQBINARY} -p -n | grep '^x'` if [ "${FIND}" = "" ]; then Display --indent 2 --text "- Checking falsetickers" --result OK --color GREEN logtext "Result: No falsetickers found (items preceeding with an 'x')" else Display --indent 2 --text "- Checking falsetickers" --result NONE --color YELLOW logtext "Result: Found one or more falsetickers (items preceeding with an 'x')" for I in ${FIND}; do I=`echo ${I} | sed 's/x//g'` logtext "Falseticker found: ${I}" report "ntp_falseticker=${I}" done ReportSuggestion ${TEST_NO} "Check ntpq peers output for falsetickers" fi fi # ################################################################################# # # Test : TIME-3136 # Description : Check ntpq reported ntp version (Linux) # Notes : Test could be improved by checking every host (YYY) if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3136 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --description "Check NTP protocol version" if [ ${SKIPTEST} -eq 0 ]; then logtext "Test: Checking NTP protocol version (ntpq -c ntpversion)" FIND=`${NTPQBINARY} -c ntpversion | awk '{ if ($1=="NTP" && $2=="version" && $5=="is") { print $6 } }'` if [ "${FIND}" = "" ]; then Display --indent 2 --text "- Checking NTP version" --result UNKNOWN --color YELLOW logtext "Result: No NTP version found" ReportSuggestion ${TEST_NO} "Check ntpq output for NTP protocol version" else Display --indent 2 --text "- Checking NTP version" --result FOUND --color GREEN logtext "Result: Found NTP version ${FIND}" report "ntp_version=${FIND}" fi fi # ################################################################################# # # Test : TIME-3146 # Description : Check /etc/default/ntpdate (Linux) # Notes : ntpdate-debian binary #if [ ${NTPD_RUNNING} -eq 1 -a ! "${NTPQBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi #Register --test-no TIME-3146 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --description "Check /etc/default/ntpdate" #if [ ${SKIPTEST} -eq 0 ]; then # ################################################################################# # # Test : TIME-3160 # Description : Check empty NTP step-tickers # Notes : Mostly applies to Red Hat and clones if [ "${NTPD_RUNNING}" -eq 1 -a ! "${NTPQBINARY}" = "" -a ! "${CHKCONFIGBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi Register --test-no TIME-3160 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --description "Check empty NTP step-tickers" if [ ${SKIPTEST} -eq 0 ]; then FOUND=0 FILE="/etc/ntp/step-tickers" if [ -f ${FILE} ]; then if [ -z ${FILE} ]; then logtext "Result: ${FILE} is empty. The step-tickers contain no configured NTP servers" Display --indent 2 --text "- Checking NTP step-tickers file" --result "EMPTY FILE" --color YELLOW ReportSuggestion ${TEST_NO} "Use step-rickers file for quicker time synchronization" else logtext "Result: /etc/ntp/step-tickers is not empty, which is fine" Display --indent 2 --text "- Checking NTP step-tickers file" --result "OK" --color GREEN sFIND=`${AWKBINARY} '/^server/ { print $2 }' /etc/ntp.conf | ${GREPBINARY} -v '127.127.1.0'` for I in ${sFIND}; do FIND=`${GREPBINARY} ^${I} ${FILE} | wc -l` if [ ${FIND} -gt 0 ]; then logtext "Result: $I exist in ${FILE}" else logtext "Result: ${I} does NOT exist in ${FILE}" FOUND=1 fi done if [ ${FOUND} -eq 1 ]; then Display --indent 4 --text "- Checking step-tickers ntp servers entries" --result "SOME MISSING" --color YELLOW ReportSuggestion ${TEST_NO} "Some time servers missing in step-tickers file" AddHP 3 4 else Display --indent 4 --text "- Checking step-tickers ntp servers entries" --result OK --color GREEN logtext "Result: all time servers are in step-tickers file" AddHP 4 4 fi fi logtext "Information: step-tickers is used by ntpdate where as ntp.conf is the configuration file for the ntpd daemon. ntpdate is initially run to set the clock before ntpd to make sure time is within 1000 sec." logtext "Risk: ntp will not run at boot if the time difference between the server and client by more then 1000 sec." else logtext "Result: test skipped because ${FILE} not found" fi fi # ################################################################################# # wait_for_keypress # ################################################################################# # report "ntp_config_found=${NTP_CONFIG_FOUND}" report "ntp_config_type_daemon=${NTP_CONFIG_TYPE_DAEMON}" report "ntp_config_type_eventbased=${NTP_CONFIG_TYPE_EVENTBASED}" report "ntp_config_type_scheduled=${NTP_CONFIG_TYPE_SCHEDULED}" report "ntp_config_type_startup=${NTP_CONFIG_TYPE_STARTUP}" report "ntp_daemon=${NTP_DAEMON}" report "ntp_daemon_running=${NTP_DAEMON_RUNNING}" # OS Time daemons Configuration file # -------------------------------------------- # AIX xntpd /etc/ntp.conf # HP # Linux ntpd /etc/ntp.conf # OpenBSD ntpd /etc/ntpd.conf # Solaris xntpd /etc/inet/ntp.conf # #================================================================================ # Lynis - Copyright 2007-2015, Michael Boelen - www.rootkit.nl - The Netherlands