[Bro] ACTION_ALARM and ACTION_EMAIL
Azoff, Justin S
jazoff at illinois.edu
Thu Jan 28 05:46:44 PST 2016
Ah, I made a common error. The redef line is a regular statement(compared to something like an 'if' or 'export' block) and it needs a ; at the end. The final line needs to be
};
Bro complains about controllee.bro because it is still expecting a ; and it is the next file that is parsed.
--
- Justin Azoff
> On Jan 28, 2016, at 6:20 AM, Tim Desrochers <tgdesrochers at gmail.com> wrote:
>
> When trying what you suggested I get the following output from broctl check:
>
> error in /opt/bro/share/bro/policy/frameworks/control/controllee.bro, line 15: syntax error, at or near "module"
>
> At the bottom of my local.bro I added:
> redef Notice::emailed_types += {
> FTP::Bruteforcing,
> FTP::Site_Exec_Success,
> HTTP::SQL_Injection_Attacker,
> HTTP::SQL_Injection_Victim,
> SMTP::Blocklist_Error_Message,
> SMTP::Blocklist_Blocked_Host,
> SMTP::Suspicious_Origination,
> SSH::Password_Guessing,
> SSH::Login_By_Password_Guesser,
> }
>
> Any reason why broctl is finding an error in the controllee.bro script.
>
> On Wed, Jan 6, 2016 at 10:50 AM, Azoff, Justin S <jazoff at illinois.edu> wrote:
> 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
>
>
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