RHEL AUDIT BASELINE

# Increase the buffers to survive stress events.
# Make this bigger for busy systems
-b 16384

# Feel free to add below this line. See auditctl man page
-e 1

# Audit configuration changes
-w /etc/audit/auditd.conf -p w -k RHEL_AUDIT_WRITE
-w /etc/audit/audit.rules -p w -k RHEL_AUDIT_WRITE

# Identity management configuration changes
-w /etc/group -p w -k RHEL_IDM_WRITE
-w /etc/passwd -p w -k RHEL_IDM_WRITE
-w /etc/gshadow -p w -k RHEL_IDM_WRITE
-w /etc/shadow -p w -k RHEL_IDM_WRITE
-w /etc/sudoers -p w -k RHEL_IDM_WRITE
-w /etc/security/group.conf -p w -k RHEL_IDM_WRITE
-w /etc/security/opasswd -p w -k RHEL_IDM_WRITE

# Identity management tools use
-w /usr/sbin/groupadd -p x -k RHEL_IDM_EXEC
-w /usr/sbin/groupmod -p x -k RHEL_IDM_EXEC
-w /usr/sbin/groupdel -p x -k RHEL_IDM_EXEC
-w /usr/sbin/useradd -p x -k RHEL_IDM_EXEC
-w /usr/sbin/usermod -p x -k RHEL_IDM_EXEC
-w /usr/sbin/userdel -p x -k RHEL_IDM_EXEC

# PAM configuration changes
-w /etc/pam.d/ -p w -k RHEL_PAM_WRITE

# Login logs changes
-w /var/log/faillog -p w -k RHEL_LOGS_WRITE
-w /var/log/lastlog -p w -k RHEL_LOGS_WRITE

# System configuration changes
-w /etc/init.d/ -p w -k RHEL_SYSTEM_WRITE
-w /etc/inittab -p w -k RHEL_SYSTEM_WRITE
-w /etc/ssh/ -p w -k RHEL_SYSTEM_WRITE
-w /etc/hosts -p w -k RHEL_SYSTEM_WRITE
-w /etc/sysconfig/ -p w -k RHEL_SYSTEM_WRITE
-w /etc/security/ -p w -k RHEL_SYSTEM_WRITE
-w /etc/login.defs -p w -k RHEL_SYSTEM_WRITE

# System calls (exclude users without login UID)
-a exit,always -F arch=b64 -S adjtimex -F auid!=4294967295 -k RHEL_SYSTEM_CALL
-a exit,always -F arch=b64 -S settimeofday -F auid!=4294967295 -k RHEL_SYSTEM_CALL

# Cron configuration changes
-w /var/spool/cron/root -p w -k RHEL_CRON_WRITE
-w /etc/at.allow -p w -k RHEL_CRON_WRITE
-w /etc/at.deny -p w -k RHEL_CRON_WRITE
-w /etc/cron.deny -p w -k RHEL_CRON_WRITE
-w /etc/cron.d/ -p w -k RHEL_CRON_WRITE
-w /etc/cron.hourly -p w -k RHEL_CRON_WRITE
-w /etc/cron.dayly -p w -k RHEL_CRON_WRITE
-w /etc/cron.weekly -p w -k RHEL_CRON_WRITE
-w /etc/cron.monthly -p w -k RHEL_CRON_WRITE
-w /etc/crontab -p w -k RHEL_CRON_WRITE
-w /etc/anacrontab -p w -k RHEL_CRON_WRITE

# Critical directories changes
-w /var/www/html -p w -k RHEL_CRITICAL_DIR_CHANGE

$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imklog   # provides kernel logging support (previously done by rklogd)
#$ModLoad immark  # provides —MARK— message capability

# Provides access to files
$ModLoad imfile

# Provides UDP syslog reception
#$ModLoad imudp
#$UDPServerRun 514

# Provides TCP syslog reception
#$ModLoad imtcp
#$InputTCPServerRun 514

#### GLOBAL DIRECTIVES ####

# Use default timestamp format
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat

# File syncing capability is disabled by default. This feature is usually not required,
# not useful and an extreme performance hit
#$ActionFileEnableSync on

# Include all config files in /etc/rsyslog.d/
$IncludeConfig /etc/rsyslog.d/*.conf

#### RULES ####

# Log all kernel messages to the console.
# Logging much else clutters up the screen.
#kern.*                                                 /dev/console

# Log anything (except mail) of level info or higher.
# Don’t log private authentication messages!
*.info;mail.none;authpriv.none;cron.none                /var/log/messages

# The authpriv file has restricted access.
authpriv.*                                              /var/log/secure

# Log all the mail messages in one place.
mail.*                                                  -/var/log/maillog

# Log cron stuff
cron.*                                                  /var/log/cron

# Everybody gets emergency messages
*.emerg                                                 *

# Save news errors of level crit and higher in a special file.
uucp,news.crit                                          /var/log/spooler

# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log

# ### begin forwarding rule ###
# The statement between the begin … end define a SINGLE forwarding
# rule. They belong together, do NOT split them. If you create multiple
# forwarding rules, duplicate the whole block!
# Remote Logging (we use TCP for reliable delivery)
#
# An on-disk queue is created for this action. If the remote host is
# down, messages are spooled to disk and sent when it is up again.
#$WorkDirectory /var/lib/rsyslog # where to place spool files
#$ActionQueueFileName fwdRule1 # unique name prefix for spool files
#$ActionQueueMaxDiskSpace 1g   # 1gb space limit (use as much as possible)
#$ActionQueueSaveOnShutdown on # save messages to disk on shutdown
#$ActionQueueType LinkedList   # run asynchronously
#$ActionResumeRetryCount -1    # infinite retries if host is down
# remote host is: name/ip:port, e.g. 192.168.0.1:514, port optional
#*.* @@remote-host:514
# ### end of the forwarding rule ###

# Audit logging via syslog setup
$WorkDirectory /var/lib/rsyslog
$InputFileName /var/log/audit/audit.log
$InputFileStateFile audit.stat
$InputFileTag audit:
$InputFileSeverity debug
$InputFileFacility local0
$InputFilePollingInterval 10
$InputRunFileMonitor

# Template for QRadar syslog message
$template RFC3164fmt,»<%PRI%>%TIMESTAMP% %HOSTNAME%-os %syslogtag%%msg%»

# Send local0.debug to QRadar
local0.debug            @@<QRADAR_HOSTNAME>:514;RFC3164fmt