Hi there,
I've been using ossec for about half a year now and I'm very happy about
it. Thanks for this great tool.
I have a linux client on which I need to monitor all activities
performed as root. My thought is to watch */root/*.bash_history and create
alerts on changes in the file.
So I created a configuration to watch this file in the clients ossec.conf:
<localfile>
<log_format>syslog</log_format>
<location>/root/.bash_history</location>
</localfile>
This works well and creates entries in the log archives of the
ossec-sever e.g.:
2016 Jul 07 11:06:28 (TheClient) xx.xx.71.109->/root/.bash_history top
I also want to generate alerts.
If I understand correctly, the next steps will be to create a decoder
and a rule. I tried with the following decoder in
etc/decoder_local.xml
<decoder name="bash_history">
<program_name>.bash_history</program_name>
</decoder>
and a rule in
rules/local_rules.xml
<rule id="105412" level="8">
<decoded_as>bash_history</decoded_as>
<description>Command run as root extracted from bash_history</description>
</rule>
This does not create allerts. Thus I used ossec-logtest to see if things go
alright:
bin/ossec-logtest -v
2016/07/07 14:40:56 ossec-testrule: INFO: Reading local decoder file.
2016/07/07 14:40:56 ossec-testrule: INFO: Started (pid: 4092).
ossec-testrule: Type one log per line.
2016 Jul 07 11:06:28 (TheClient) xx.xx.71.109->/root/.bash_history top
**Phase 1: Completed pre-decoding.
full event: '2016 Jul 07 11:06:28 (TheClient)
xx.xx.71.109->/root/.bash_history top'
hostname: 'ossec-server'
program_name: '(null)'
log: '2016 Jul 07 11:06:28 (TheClient) xx.xx.71.109->/root/.bash_history
top'
**Phase 2: Completed decoding.
No decoder matched.
**Rule debugging:
Trying rule: 1 - Generic template for all syslog rules.
*Rule 1 matched.
*Trying child rules.
Trying rule: 5500 - Grouping of the pam_unix rules.
<and so on...>
Obviously, the decoder I'm using is not working. Also pre-decoding does
not extract information from this log entry.
How do I advance to get alerts from the root activities extracted from
bash_history?
According to the log-archive, OSSEC knows the origin of the message
(*/root/*.bash_history). Is this available to the decoder or to a rule?
Im also not sure, this is the best approach to observe activities of the
root user. Hints are welcome.
Greetings
Dominik
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