Op woensdag 20 november 2013 19:24:01 UTC+1 schreef dan (ddpbsd):
>
> On Wed, Nov 20, 2013 at 9:30 AM, Michiel van Es
> <[email protected]<javascript:>>
> wrote:
> > Hello,
> >
> > i have some basic questions about OSSEC server <-> agent model:
> >
> > - is it correct that the agents ossec.conf can be as small as:
> > <ossec_config>
> > <client>
> > <server-hostname>OSSEC-SERVERNAME</server-hostname>
> > </client>
> > </ossec_config>
> >
> > - I push all checks on the server via /var/ossec/etc/shared/agent.conf
> (the
> > file being synched) ?
> >
>
> Most things work just fine in the agent.conf.
>
> > - If I want to run the netstat command on all nodes via the
> > shared/agent.conf on the server that I have to do the following:
> >
> > 1) change the agent.conf to include:
> > <localfile>
> > <log_format>full_command</log_format>
> > <command>netstat -tan |grep LISTEN |grep -v 127.0.0.1 |
> sort</command>
> > </localfile>
> > 2) change the /var/ossec/etc/internal_options.conf on all agents that
> > include:
> > logcollector.remote_commands=1
> > 3) restart the server and then all agents ossec ?
> >
>
> Seems correct.
> > Option 2) seems to cause an extra security risk (like Nagios NRPE): if
> the
> > ossec server is compromised all servers can be reached or can be used to
> > execute command remotely via the ossec server, is that correct?
> >
>
> Correct, and I believe this is why remote commands are disabled by
> default.
>
Do you know if there is another way of accomplishing the netstat -tan diff
on all agents without the need to enable the remote commands on all agents?
Specify it in the ossec.conf on all agents?
I only have:
<ossec_config>
<client>
<server-hostname>OSSEC-SERVERNAME</server-hostname>
</client>
</ossec_config>
What should I need to add the netstat command?
Only add the following to the ossec.conf for the agents :
<localfile>
<log_format>full_command</log_format>
<command>netstat -tan |grep LISTEN|grep -v 127.0.0.1</command>
</localfile>
and can I specify how often this needs to run on the agents? (I want to
randomise the time it should run).
Michiel
>
> > Thanks for clearing things up :)
> >
> > Michiel
> >
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