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

Justin Azoff (JIRA) jira at bro-tracker.atlassian.net
Thu Jan 14 08:07:00 PST 2016

    [ https://bro-tracker.atlassian.net/browse/BIT-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=23824#comment-23824 ] 

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:

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

jazoff at Justins-MacBook-Air  /tmp/b  $ cat known_services.log |bro-cut  host port_num service	2811	FTP	55968	SSL

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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