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

Justin Azoff (JIRA) jira at bro-tracker.atlassian.net
Wed Jan 13 06:54:00 PST 2016

    [ https://bro-tracker.atlassian.net/browse/BIT-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=23819#comment-23819 ] 

Justin Azoff commented on BIT-1521:

Hmm, this may be a little harder than I thought.  c$service is a set, and bro doesn't have a bif for comparing one set to another set.. i can do it with a loop like this, but is there a better way?

function intersects(a: set[string], b: set[string]): bool{
	for (one in a) {
		if (one in b) {
			return T;
	return F;

even though c$service is a set, it should only have 1 or 2 strings in it, so it is not a large loop.

> 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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