Re: Logging Packets with Snort

[Johnny Venter <Johnny.Venter () zoho com>]

Here's my command:

openfpc-client -u user -p pwd -d -a fetch --bpf /tmp/test.bpf --stime 1382713697 --etime 1382729022 -w /tmp/zzzz.pcap

And the results:

----Config----
Server   :  localhost
Port     :  4242
User     :  user
Action   :  fetch
Logtype  :  auto
Logline  :  0
Filename :  /tmp/out.pcap
SumType  :  0 
Last     :  0
stime    :  1382713697 Fri Oct 25 11:08:17 2013
etime    :  1382729022 Fri Oct 25 15:23:42 2013


   * openfpc-client 0.6 * 
   Part of the OpenFPC project

Logline created from session IDs: ofpc-v1-bpf type:search bpf: /tmp/test.bpf stime:1382713697 etime:1382729022 
timestamp: 
DEBUG: Connected to localhost
DEBUG: Sent Request
Problem processing request: 0


I get nothing! One thing I do notice is "timestamp" is blank.  

Thanks.

On Oct 25, 2013, at 3:10 PM, Jeremy Hoel <jthoel () gmail com> wrote:

> so try this, if you have openfpc-client installed on your workstations,
>
> openfpc-client -u $USER -p $PW -s $sensor-IP -a fetch --bpf \"$BPF\"
> --stime $STIME --etime $ETIME -w $OUT_FILE
>
> STIME is an epoch time:
> Enter pcap start date & time: 10/25/13 15:08:17
> stime = 1382713697
>
> ETIME is the amount of time to review
>
> BPF is normally something like  'host 192.168.10.10' or more specific
> if you want.
>
> If you don't have the client tools on your workstation you should be
> able to try it on the sensor without the -s (I haven't done that
> before)
>
>
>
>
>
> On Fri, Oct 25, 2013 at 7:02 PM, Johnny Venter <Johnny.Venter () zoho com> wrote:
> > Hi Jeremy, thanks for the quick response and yes, I need more help :)
> >
> > When I issue:
> >
> > openfpc-client -a status
> >
> > The oldest packet is: 1380905610 (Fri Oct  4 12:53:30 2013)
> >
> > The packet request in my previous email was requested today.
> >
> > Here's some more information on my setup:  I have a snort sensor with
> > Barnyard2, MySQL and with openfpc installed and capturing packets--I think
> > they reference this as running in "slave" mode.  I have another server that
> > runs Snorby and connects to the MySQL database on the snort sensor.  I
> > request packets from the Snorby server which in turn connects to the snort
> > sensor for packet requests.
> >
> > Any other ideas was to why I'm getting 24 byte packets?
> > While I do like the full packet capture so I can detect the start of an
> > intrusion, can I query the unified2 file similar to what Sourcefire does?
> >
> > Thanks.
> >
> >
> > On Oct 25, 2013, at 2:52 PM, Jeremy Hoel <jthoel () gmail com> wrote:
> >
> > The interface you are talking about and using is Snorby; it's a gui for
> > looking at snort alerts.  Snort itelf does not capture full packets, just
> > the bits that cause the event (like you see in SourceFire).  Snorby has a
> > plug-n for the a tool called OpenFPC (which is what you see in your logs)
> > that connects back to an OpenFPC client/server to get the pcap data, but you
> > have to run openfpc on the sensor and set it up.
> >
> > We've found that the 'extract packets' part doesn't work great due to the
> > way that OpenFPC does client/server comms over many devices.  But, we do run
> > OpenFPC, do the full packet captures and pull the packets ourselves with a
> > script to the sensor that we want the data from.
> >
> > The errors you are showing could be because the pcap data isn't there
> > anymore (how far back do your openfpc captures go?)
> >
> > I hope that helps clarify some bits and if you need more help, let me know.
> >
> >
> >
> >
> > On Fri, Oct 25, 2013 at 6:45 PM, Johnny Venter <Johnny.Venter () zoho com>
> > wrote:
> > > Having some performance issues with my Snort sensor that has OpenFPC
> > > installed.
> > >
> > > Not sure if this is the right place for this question, but here goes:
> > >
> > > I have a sensor that monitors the Internet traffic.  The interface is 1GB.
> > > When I try to download packet captures (from Snorby) most of the time it
> > > takes a while and then downloads a packet that is 24 bytes.  When I open
> > > this pcap in Wireshark or tcpdump, it only displays one line: link-type
> > > EN10MB (Ethernet)
> > >
> > > When I click on the "Packet Capture Options" in Snorby:
> > >
> > > <Screen Shot 2013-10-25 at 2.37.55 PM.png>
> > >
> > > I watch the syslog from my snort sensor and here is the output:
> > >
> > > Oct 25 14:34:15 snort_s OpenfpcQ[1035]: snort_s COMMS: Accepted new
> > > connection from 127.0.0.1
> > > Oct 25 14:34:15 snort_s OpenfpcQ[1035]: snort_s DECODE: User netp-user
> > > assigned RID: 0 for action fetch. Comment: 0 Filetype : PCAP
> > > Oct 25 14:34:15 snort_s OpenfpcQ[1035]: snort_s COMMS: 127.0.0.1: RID: 15
> > > Fetch Request OK -> WAIT!
> > > Oct 25 14:34:15 snort_s OpenfpcQ[1035]: snort_s NODE: Request: 15 User:
> > > netp-user Action: fetch BPF: host 192.168.216.175 and host 192.168.216.77
> > > Oct 25 14:34:42 snort_s OpenfpcQ[1035]: snort_s NODE: Request: 15 User:
> > > netp-user Result: 1382726055-15.pcap, 24, ab487d36057d446b6a8b72091da72f23
> > > Oct 25 14:34:42 snort_s OpenfpcQ[1035]: snort_s COMMS: 15 127.0.0.1
> > > Sending File:/tmp/1382726055-15.pcap MD5: ab487d36057d446b6a8b72091da72f23
> > > Oct 25 14:34:42 snort_s OpenfpcQ[1035]: snort_s COMMS: Uploaded 1 x 1KB
> > > chunks
> > >
> > > So it's really a hit or miss with my packet capture.  Does anyone have any
> > > idea why this happens?
> > >
> > > Also, in the commercial version of Snort (Sourcefire), it *seems* to
> > > capture just the packet the generated the alert--which saves space and
> > > resources.  Can this be replicated with snort's unified2 output mode (which
> > > I currently use)? If so, how can I query the binary file for the specific
> > > intrusion event?
> > >
> > > Thanks.
> > >
> > >
> > >
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