If you need to enter multiple hostnames, the delimiter is "|"
Let us know what you find.
On Fri, Mar 4, 2011 at 3:39 PM, Jeremy Lee<[email protected]
<mailto:[email protected]>> wrote:
Not sure what you would modify in decoder.xml to get the
5100/5113 rules to pickup source IP... Because it seems like
the 5100 base rule is not relying on a decoder but rather
program_name - in this case "^kernel"
In this scenario, I *think* you may need to utilize
<hostname> (what I had suggested in your other thread). The
drawback is that you'll have to add a long list of
hostnames... because I'm assuming this is for all those Linux
boxes you're monitoring, right?
I'm not sure if you can use regex in the<hostname> attribute
but it's not difficult to test. Especially with ossec-logtest.
On Fri, Mar 4, 2011 at 3:24 PM, Lars Oberg
<[email protected]<mailto:[email protected]>> wrote:
Hi Dan,
Thanks for clarifying that. If I understand you
correctly: even though the alert log shows the IP
address, I cannot match on it using RegEx since it is not
part of the actual message body from syslog.
Is there another way to suppress these e-mails, or do I
have to mess with the decoder, so that it decodes the
source IP?
Lars
On 3/4/2011 2:59 PM, dan (ddp) wrote:
Hi Lars,
On Fri, Mar 4, 2011 at 5:54 PM, Lars
Oberg<[email protected]
<mailto:[email protected]>> wrote:
Actually, it does - I tested the RegEx against
the email alert, and it
matches. But I tested with PCRE regex. Is there
a different flavor regex I
need to use?
The OSSEC regex.
http://www.ossec.net/doc/syntax/regex.html
Also, if the regex is not correct, how come the
other rule (100201) fires?
100201 Deals with the log message: "ossec: Agent
started: '785->10.1.3.4'."
That log message contains an IP address.
100200 deals with the log message: "Mar 4 12:47:55
l785 kernel:
Kernel log daemon terminating."
That log message does not contain an IP address.
On 3/4/2011 2:05 PM, dan (ddp) wrote:
The log message in 5113 does not appear to
contain an IP address:
"Mar 4 12:47:55 l785 kernel: Kernel log
daemon terminating."
A regex for an IP would not match that log
message.
On Fri, Mar 4, 2011 at 4:57 PM, Lars
Oberg<[email protected]
<mailto:[email protected]>> wrote:
I have a rule for which I cannot seem to
disable the email alerts. Since
SrcIp is not decoded for this rule, I am
using a regex. Below is my
local_rules.xml file (only 2 rules). The
rule that doesn't fire is
100200,
but the strange thing is that the rule
below it (100201) is firing just
fine, use the exact same regex to match
on the IP address of the
workstation
I'm testing on.
This is very confusing to me, but I am
new to ossec, so I am hopefully
just
overlooking something simple.
Below is also the e-mail notification I
am trying to suppress as well as
the
contents of the alert log.
What am I missing?
----- local_rules.xml -----
<group name="local,syslog,">
<rule id="100200" level="2">
<if_sid>5113</if_sid>
<regex>(10\.\d*\.3\.\d*)|(10.1.1.152)</regex>
<options>no_email_alert</options>
<description>No e-mail alerts for work
stations shutting
down.</description>
</rule>
<rule id="100201" level="2">
<if_sid>503</if_sid>
<regex>(10\.\d*\.3\.\d*)|(10.1.1.152)</regex>
<options>no_email_alert</options>
<description>No email alerts when work
stations start up.</description>
</rule>
</group> <!-- SYSLOG,LOCAL -->
----- Email -----
OSSEC HIDS Notification.
2011 Mar 04 12:47:56
Received From: (785)
10.1.3.4->/var/log/messages
Rule: 5113 fired (level 7) -> "System
is shutting down."
Portion of the log(s):
Mar 4 12:47:55 l785 kernel: Kernel log
daemon terminating.
--END OF NOTIFICATION
----- Alert log (notice that 5113 fires,
instead of 100200) -----
** Alert 1299272104.152207: mail -
syslog,linuxkernel,system_shutdown,
2011 Mar 04 12:55:04 (785)
10.1.3.4->/var/log/messages
Rule: 5113 (level 7) -> 'System is
shutting down.'
Src IP: (none)
User: (none)
Mar 4 12:55:03 l785 kernel: Kernel log
daemon terminating.
** Alert 1299272227.153206: - local,syslog,
2011 Mar 04 12:57:07 (785) 10.1.3.4->ossec
Rule: 100201 (level 2) -> 'No email
alerts when POS stations start up.'
Src IP: (none)
User: (none)
ossec: Agent started: '785->10.1.3.4'.
