[Bro] ACTION_ALARM and ACTION_EMAIL
Azoff, Justin S
jazoff at illinois.edu
Wed Jan 6 07:50:47 PST 2016
I'm not sure about #2, but for 1 and 3 there is an easy way to do this with the default configuration. The notice framework has this as the notice policy:
hook Notice::policy(n: Notice::Info) &priority=10
{
if ( n$note in Notice::ignored_types )
break;
if ( n$note in Notice::not_suppressed_types )
n$suppress_for=0secs;
if ( n$note in Notice::alarmed_types )
add n$actions[ACTION_ALARM];
if ( n$note in Notice::emailed_types )
add n$actions[ACTION_EMAIL];
if ( n$note in Notice::type_suppression_intervals )
n$suppress_for=Notice::type_suppression_intervals[n$note];
# Logging is a default action. It can be removed in a later hook if desired.
add n$actions[ACTION_LOG];
}
Those tables are all setup to make it easy to toggle actions:
## Ignored notice types.
const ignored_types: set[Notice::Type] = {} &redef;
## Emailed notice types.
const emailed_types: set[Notice::Type] = {} &redef;
## Alarmed notice types.
const alarmed_types: set[Notice::Type] = {} &redef;
## Types that should be suppressed for the default suppression interval.
const not_suppressed_types: set[Notice::Type] = {} &redef;
So you simply need something like this in your local.bro:
redef Notice::emailed_types += {
HTTP::SQL_Injection_Attacker,
HTTP::SQL_Injection_Victim,
}
If you do need to do anything more complicated, you can use your own Notice::policy and add whatever logic you want.
To not get multiple emails for the same notice you need to ensure that the notice has the $identifier set that uniquely identifies the notice. This is minimally something like cat(id$orig_h). If you look at any of the scripts in policy/ you can see how they do this.
--
- Justin Azoff
> On Jan 6, 2016, at 10:33 AM, Tim Desrochers <tgdesrochers at gmail.com> wrote:
>
> I have my sensor set up to email me notices with:
>
> hook Notice::policy(n: Notice::Info)
> {
> add n$actions[Notice::ACTION_EMAIL];
> }
>
> If I understand correct this will email me upon any entry in the notice.log. Is there a way to:
> 1. only get specific items emailed upon entry
> 2. get the rest of notice.log entries emailed with ACTON_ALARM in the alarm-mail.txt and have that ignore anything that was previously emailed.
> 3. Only get one notice email per alert?
>
> What I am doing is in the /opt/bro/share/bro/intel folder creating different folders with IOS's I want the intel framework to look over and I am using meta.do_notice to send the items of importance to the notice log.
>
> Excuse my ignorance with this subject I am just now trying to get things emailed out efficiently to reduce some noise and redundancy my analysts are seeing.
> _______________________________________________
> Bro mailing list
> bro at bro-ids.org
> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/bro
More information about the Bro
mailing list