[Bro-Dev] [JIRA] (BIT-1521) known services should probably ignore gridftp-data - zeek-dev

14 Jan 2016

    [
https://bro-tracker.atlassian.net/browse/BIT-1521?page=com.atlassian.jira.p…
] 

Justin Azoff commented on BIT-1521:
-----------------------------------

Gah. It looks like coming up with a test case for this will be a pain. The existing pcap
doesn't get detected as gridftp-data since the transfer size is too small:

{code}
jazoff@Justins-MacBook-Air  /tmp/b  $ bro -r
~/src/bro/testing/btest//Traces/globus-url-copy.trace local base/protocols/ftp/gridftp 
'Known::service_tracking=ALL_HOSTS'
WARNING: No Site::local_nets have been defined.  It's usually a good idea to define
your local networks.
20000, 1

jazoff@Justins-MacBook-Air  /tmp/b  $ cat conn.log |bro-cut id.orig_h id.orig_p id.resp_h
id.resp_p service
192.168.57.103	60108	192.168.57.101	2811	ssl,gridftp,ftp
192.168.57.103	35391	192.1
68.57.101	55968	ssl

jazoff@Justins-MacBook-Air  /tmp/b  $ cat known_services.log |bro-cut  host port_num
service
192.168.57.101	2811	FTP
192.168.57.101	55968	SSL
{code}

Filtering the ephemeral ssl service running on port 55968 is what I am trying to
accomplish here.

...
  known services should probably ignore gridftp-data
 --------------------------------------------------

                 Key: BIT-1521
                 URL: https://bro-tracker.atlassian.net/browse/BIT-1521
             Project: Bro Issue Tracker
          Issue Type: Improvement
          Components: Bro
    Affects Versions: 2.4
            Reporter: Justin Azoff
            Assignee: Justin Azoff
            Priority: Low

 known services script does
 {code}
         if ( ! addr_matches_host(id$resp_h, service_tracking) ||
              "ftp-data" in c$service || # don't include ftp data sessions
              ("DNS" in c$service && c$resp$size == 0) ) # for dns,
require that the server talks.
                 return;
 {code}
 but should probably also ignore gridftp-data.  Probably a good idea to add a set of
services that behave like ftp for it to check. 

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