Thanks Dan. Is there a way to get OSSEC to provide more details on the messages it actually processes? I'd like to gain a better understanding of this application because it has a lot of seemingly random behaviour.
On Thursday, February 9, 2017 at 9:59:24 PM UTC+2, dan (ddpbsd) wrote: > > On Thu, Feb 9, 2017 at 9:48 AM, Quintin Beukes <[email protected] > <javascript:>> wrote: > > Hi group, > > > > Server uname: Linux 2.6.32-642.13.1.el6.x86_64 #1 SMP Wed Jan 11 > 20:56:24 > > UTC 2017 x86_64 x86_64 x86_64 GNU/Linux > > Agent uname: Linux 2.6.32-642.13.1.el6.x86_64 #1 SMP Wed Jan 11 20:56:24 > UTC > > 2017 x86_64 x86_64 x86_64 GNU/Linux > > > > I am generating 5 log messages at 2 second intervals to trigger rule > 1002. > > 16:40:43 [quintinb@ho-pri-vm-quintindev ~]$ for x in {11..15}; do logger > > test error$x; date; sleep 2; done > > Thu Feb 9 16:40:48 SAST 2017 > > Thu Feb 9 16:40:50 SAST 2017 > > Thu Feb 9 16:40:52 SAST 2017 > > Thu Feb 9 16:40:54 SAST 2017 > > Thu Feb 9 16:40:56 SAST 2017 > > A tcpdump on the server indicates all 5 are received: > > 16:40:49.197974 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length > 121 > > 16:40:51.200118 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length > 121 > > 16:40:53.202224 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length > 121 > > 16:40:55.204480 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length > 121 > > 16:40:57.206407 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length > 121 > > > > Though alerts.log only shows 3 of the 5. > > ** Alert 1486651295.2432248: mail - syslog,errors, > > 2017 Feb 09 16:41:35 (quintindev) 10.10.10.100->/var/log/messages > > Rule: 1002 (level 2) -> 'Unknown problem somewhere in the system.' > > Feb 9 16:40:48 ho-pri-vm-quintindev quintinb: test error11 > > > > ** Alert 1486651298.2432494: mail - syslog,errors, > > 2017 Feb 09 16:41:38 (quintindev) 10.10.10.100->/var/log/messages > > Rule: 1002 (level 2) -> 'Unknown problem somewhere in the system.' > > Feb 9 16:40:52 ho-pri-vm-quintindev quintinb: test error13 > > > > ** Alert 1486651305.2432740: mail - syslog,errors, > > 2017 Feb 09 16:41:45 (quintindev) 10.10.10.100->/var/log/messages > > Rule: 1002 (level 2) -> 'Unknown problem somewhere in the system.' > > Feb 9 16:40:56 ho-pri-vm-quintindev quintinb: test error15 > > > > > > Sometimes it alerts on all 5. Though upon inspection it seems OSSEC > misses > > 50%+ of my messages, even though I see the packets delivered to the > server. > > > > Is there an explanation for this? Any way I can get more verbose > logging on > > this to investigate deeper? > > > > OSSEC does discard some duplicate messages, and I'm not sure if the > timestamp is taken into account or not off hand. > > > Quintin > > > > -- > > > > --- > > You received this message because you are subscribed to the Google > Groups > > "ossec-list" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to [email protected] <javascript:>. > > For more options, visit https://groups.google.com/d/optout. > -- --- You received this message because you are subscribed to the Google Groups "ossec-list" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
