====== 4.2.1.5 Ensure remote rsyslog messages are only accepted on designated log hosts. (Not Scored) ======
=====Profile Applicability=====  
<code>
Level 1 - Server 
Level 1 - Workstation
</code>
=====Description=====
By default, ''rsyslog'' does not listen for log messages coming in from remote systems. The ''ModLoad'' tells ''rsyslog'' to load the ''imtcp.so'' module so it can listen over a network via TCP. The ''InputTCPServerRun'' option instructs ''rsyslogd'' to listen on the specified TCP port.
=====Rationale=====
The guidance in the section ensures that remote log hosts are configured to only accept ''rsyslog'' data from hosts within the specified domain and that those systems that are not designed to be log hosts do not accept any remote ''rsyslog'' messages. This provides protection from spoofed log data and ensures that system administrators are reviewing reasonably complete ''syslog'' data in a central location.
=====Audit===== 
Run the following commands and verify the resulting lines are uncommented on designated log hosts and commented or removed on all others:
<Code:bash>
# grep '$ModLoad imtcp.so' /etc/rsyslog.conf 
$ModLoad imtcp.so 
# grep '$InputTCPServerRun' /etc/rsyslog.conf 
$InputTCPServerRun 514
</Code>
=====Remediation===== 
For hosts that are designated as log hosts, edit the ''/etc/rsyslog.conf'' file and un-comment or add the following lines:
<Code:bash>
$ModLoad imtcp.so 
$InputTCPServerRun 514
</Code>
For hosts that are not designated as log hosts, edit the ''/etc/rsyslog.conf'' file and comment or remove the following lines:
<Code:bash>
# $ModLoad imtcp.so 
# $InputTCPServerRun 514
</Code>
Run the following command to restart ''rsyslogd'':
<Code:bash>
# pkill -HUP rsyslogd
</Code>
=====References===== 
See the ''rsyslog(8)'' man page for more information.