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#!/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.
#
#################################################################################
#
# Time
#
#################################################################################
#
InsertSection "Time and Synchronization"
#
#################################################################################
#
CRON_DIRS="/etc/cron.d /etc/cron.hourly /etc/cron.daily /etc/cron.weekly /etc/cron.monthly /var/spool/crontabs"
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
NTPD_RUNNING=0 # Specific for ntpd
SYSTEMD_NTP_ENABLED=0
#
#################################################################################
#
# 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
elif [ -f /sbin/sysctl ] && [ "`/sbin/sysctl -n security.jail.jailed 2>/dev/null || echo 0`" -eq 1 ]; then
# Skip NTP tests if we're in a FreeBSD jail
PREQS_MET="NO"
else
PREQS_MET="YES"
fi
Register --test-no TIME-3104 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check for running NTP daemon or client"
if [ ${SKIPTEST} -eq 0 ]; then
# Linux/FreeBSD (ntpdate), OpenBSD (ntpd, rdate), Chrony, systemd-timesyncd
LogText "Test: Searching for a running NTP daemon or available client"
FOUND=0
if [ -f /etc/chrony.conf ]; then
IsRunning chronyd
if [ ${RUNNING} -eq 1 ]; then
FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="chronyd"
Display --indent 2 --text "- NTP daemon found: chronyd" --result "${STATUS_FOUND}" --color GREEN
fi
fi
# Check time daemon (eg DragonFly BSD)
IsRunning dntpd
if [ ${RUNNING} -eq 1 ]; then
FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="dntpd"
Display --indent 2 --text "- NTP daemon found: dntpd" --result "${STATUS_FOUND}" --color GREEN
fi
# Check running processes
FIND=$(${PSBINARY} ax | ${GREPBINARY} "ntpd" | ${GREPBINARY} -v "dntpd" | ${GREPBINARY} -v "grep")
if [ ! "${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 "${STATUS_FOUND}" --color GREEN
fi
# Check time daemon (eg NetBSD)
IsRunning timed
if [ ${RUNNING} -eq 1 ]; then
FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="timed"
Display --indent 2 --text "- NTP daemon found: timed" --result "${STATUS_FOUND}" --color GREEN
fi
# Check timedate daemon (systemd)
if [ ! -z "${TIMEDATECTL}" ]; then
FIND=$(${TIMEDATECTL} status | ${GREPBINARY} "NTP synchronized: yes")
if [ ! "${FIND}" = "" ]; then
# Check for systemd-timesyncd
if [ -f /etc/systemd/timesyncd.conf ]; then
FOUND=1; NTP_DAEMON_RUNNING=1; NTP_CONFIG_TYPE_DAEMON=1; NTP_DAEMON="systemd-timesyncd"
Display --indent 2 --text "- NTP daemon found: systemd (timesyncd)" --result "${STATUS_FOUND}" --color GREEN
SYSTEMD_NTP_ENABLED=1
fi
else
LogText "Result: time sychronization not performed according timedatectl command"
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 ${I}"
FIND=$(${EGREPBINARY} "ntpdate|rdate" ${I} | ${GREPBINARY} -v '^#')
if [ ! "${FIND}" = "" ]; then
FOUND=1; NTP_CONFIG_TYPE_SCHEDULED=1
Display --indent 2 --text "- Checking NTP client in crontab file (${I})" --result "${STATUS_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 "${STATUS_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
# 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 ${I} ]; then
FIND=$(${LSBINARY} ${I} | ${GREPBINARY} -v FIFO)
if [ ! "${FIND}" = "" ]; then
for J in ${FIND}; do
LogText "Test: checking for ntpdate or rdate in ${I}/${J}"
FIND2=$(${EGREPBINARY} "rdate|ntpdate" ${I}/${J} | ${GREPBINARY} -v "^#")
if [ ! "${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 [ ${FOUND_IN_CRON} -eq 1 ]; then
Display --indent 2 --text "- Checking NTP client in cron files" --result "${STATUS_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 "${STATUS_NOT_FOUND}" --color WHITE
LogText "Result: no ntpdate or rdate found in cron directories"
fi
# Checking if ntpdate is performed by event
LogText "Test: checking for file /etc/network/if-up.d/ntpdate"
if [ -f /etc/network/if-up.d/ntpdate ]; then
LogText "Result: found ntpdate action when network interface comes up"
FOUND=1
NTP_CONFIG_TYPE_EVENTBASED=1
Display --indent 2 --text "- Checking event based ntpdate (if-up)" --result "${STATUS_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=$(${GREPBINARY} 'ntpdate_enable="YES"' /etc/rc.conf)
if [ ! "${FIND}" = "" ]; then
LogText "Result: ntpdate is enabled in rc.conf"
FOUND=1
NTP_CONFIG_TYPE_STARTUP=1
# Only show suggestion when ntpdate is enabled, however ntpd is not running
if [ ${NTP_DAEMON_RUNNING} -eq 0 ]; then
ReportSuggestion ${TEST_NO} "Although ntpdate is enabled in rc.conf, it is advised to run it at least daily or use a NTP daemon"
fi
else
LogText "Result: ntpdate is not enabled in rc.conf"
fi
fi
if [ ${FOUND} -eq 0 ]; then
if [ ${ISVIRTUALMACHINE} -eq 1 ]; then
LogText "Result: Skipping display warning, as virtual machines usually don't need time synchronization in the VM itself"
else
Display --indent 2 --text "- Checking for a running NTP daemon or client" --result "${STATUS_WARNING}" --color RED
LogText "Result: Could not find a NTP daemon or client"
ReportSuggestion ${TEST_NO} "Use NTP daemon or NTP client to prevent time issues."
AddHP 0 2
fi
else
Display --indent 2 --text "- Checking for a running NTP daemon or client" --result "${STATUS_OK}" --color GREEN
LogText "Result: Found a time syncing daemon/client."
AddHP 3 3
fi
fi
#
#################################################################################
#
# Test : TIME-3106
# Description : Check status of systemd time synchronization
if [ ${SYSTEMD_NTP_ENABLED} -eq 1 -a ! "${TIMEDATECTL}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no TIME-3106 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check systemd NTP time synchronization status"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Check the status of time synchronization via timedatectl"
FIND=$(${TIMEDATECTL} status | ${GREPBINARY} "NTP synchronized: yes")
if [ -z "${FIND}" ]; then
LogText "Result: time not synchronized via NTP"
ReportSuggestion "${TEST_NO}" "Check timedatectl output. Sychronization via NTP is enabled, but status reflects it is not synchronized"
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 --category security --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 | ${GREPBINARY} "No association ID's returned")
if [ -z "${FIND}" ]; then
Display --indent 2 --text "- Checking valid association ID's" --result "${STATUS_FOUND}" --color GREEN
LogText "Result: Found one or more association ID's"
else
Display --indent 2 --text "- Checking valid association ID's" --result "${STATUS_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 --category security --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 | ${AWKBINARY} '{ if ($3=="16") { print $1 }}')
if [ "${FIND}" = "" ]; then
Display --indent 2 --text "- Checking high stratum ntp peers" --result "${STATUS_OK}" --color GREEN
LogText "Result: All peers are lower than stratum 16"
else
for I in ${FIND}; do
LogText "Found stratum 16 peer: ${I}"
FIND2=$(${EGREPBINARY} "^ntp:ignore_stratum_16_peer:${I}:" ${PROFILE})
if [ -z "${FIND2}" ]; then
N=$((N + 1))
Report "ntp_stratum_16_peer[]=${I}"
else
LogText "Output: host ${I} ignored by profile"
fi
done
# Check if one or more high stratum time servers are found
if [ ${N} -eq 0 ]; then
Display --indent 2 --text "- Checking high stratum ntp peers" --result "${STATUS_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 "${STATUS_WARNING}" --color RED
LogText "Result: Found one or more high stratum (16) peers)"
ReportSuggestion ${TEST_NO} "Check ntpq peers output for startum 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 --category security --description "Check unreliable NTP peers"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking unreliable ntp peers"
FIND=`${NTPQBINARY} -p -n | ${EGREPBINARY} "^(-|#)" | ${AWKBINARY} '{ print $1 }' | ${SEDBINARY} 's/^-//g'`
if [ "${FIND}" = "" ]; then
Display --indent 2 --text "- Checking unreliable ntp peers" --result "${STATUS_NONE}" --color GREEN
LogText "Result: No unreliable peers found"
else
Display --indent 2 --text "- Checking unreliable ntp peers" --result "${STATUS_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: ${I}"
Report "ntp_unreliable_peer[]=${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 --category security --description "Check selected time source"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking selected time source"
FIND=$(${NTPQBINARY} -p -n | ${GREPBINARY} '^*' | ${AWKBINARY} '{ if ($4=="l") { print $1 } }')
FIND2=$(${NTPQBINARY} -p -n | ${GREPBINARY} '^*' | ${AWKBINARY} '{ print $1 }')
if [ -z "${FIND}" -a ! -z "${FIND2}" ]; then
Display --indent 2 --text "- Checking selected time source" --result "${STATUS_OK}" --color GREEN
FIND2=`echo ${FIND2} | ${SEDBINARY} 's/*//g'`
LogText "Result: Found selected time source (value: ${FIND2})"
else
Display --indent 2 --text "- Checking selected time source" --result "${STATUS_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 --category security --description "Check preffered time source"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking preferred time source"
FIND=$(${NTPQBINARY} -p -n | ${GREPBINARY} '^+' | ${AWKBINARY} '{ print $1 }')
if [ -z "${FIND}" ]; then
Display --indent 2 --text "- Checking time source candidates" --result "${STATUS_NONE}" --color YELLOW
LogText "Result: No other time source candidates found"
ReportSuggestion ${TEST_NO} "Check ntpq peers output for time source candidates"
else
Display --indent 2 --text "- Checking time source candidates" --result "${STATUS_OK}" --color GREEN
LogText "Result: Found one or more candidates to synchronize time with."
for I in ${FIND}; do
I=$(echo ${I} | ${SEDBINARY} '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 --category security --description "Check NTP falsetickers"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking preferred time source"
FIND=$(${NTPQBINARY} -p -n | ${EGREPBINARY} '^x')
if [ -z "${FIND}" ]; then
Display --indent 2 --text "- Checking falsetickers" --result "${STATUS_OK}" --color GREEN
LogText "Result: No falsetickers found (items preceeding with an 'x')"
else
Display --indent 2 --text "- Checking falsetickers" --result "${STATUS_NONE}" --color YELLOW
LogText "Result: Found one or more falsetickers (items preceeding with an 'x')"
for I in ${FIND}; do
I=$(echo ${I} | ${SEDBINARY} '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)
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 --category security --description "Check NTP protocol version"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking NTP protocol version (ntpq -c ntpversion)"
FIND=$(${NTPQBINARY} -c ntpversion | ${AWKBINARY} '{ if ($1=="NTP" && $2=="version" && $5=="is") { print $6 } }')
if [ -z "${FIND}" ]; then
Display --indent 2 --text "- Checking NTP version" --result "${STATUS_UNKNOWN}" --color YELLOW
LogText "Result: No NTP version found"
ReportSuggestion ${TEST_NO} "Check ntpq output for NTP protocol version"
else
Display --indent 2 --text "- Checking NTP version" --result "${STATUS_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 --category security --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 --category security --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 ${TEST_NO} "Use step-rickers file for quicker time synchronization"
else
LogText "Result: /etc/ntp/step-tickers is not empty, which is fine"
Display --indent 2 --text "- Checking NTP step-tickers file" --result "${STATUS_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 ${TEST_NO} "Some time servers missing in step-tickers file"
AddHP 3 4
else
Display --indent 4 --text "- Checking step-tickers ntp servers entries" --result "${STATUS_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
#
#################################################################################
#
# For VMs check ntpd.conf : tinker panic 0
#
WaitForKeyPress
#
#################################################################################
#
# Test : TIME-3170
# Description : Check file permissions and ownership of configuration files
# Notes : Files should be owned by root, or the user running
# Group owner should have only read access
# Other should preferably have no access, or read-only at max
FILE_ARRAY="/etc/chrony.conf /etc/inet/ntp.conf /etc/ntp.conf /usr/local/etc/ntp.conf"
Register --test-no TIME-3170 --weight L --network NO --category security --description "Check configuration files"
if [ ${SKIPTEST} -eq 0 ]; then
for FILE in ${FILE_ARRAY}; do
if [ -f ${FILE} ]; then
LogText "Result: found ${FILE}"
if IsWorldWritable ${FILE}; then
ReportWarning "${TEST_NO}" "Found world writable configuration file" "${FILE}" ""
fi
Report "ntp_config_file[]=${FILE}"
fi
done
fi
#
#################################################################################
#
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
# chrony /etc/chrony.conf
# OpenBSD ntpd /etc/ntpd.conf
# Solaris xntpd /etc/inet/ntp.conf
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
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