[Zeek] Creating a module and accessing an event in another script

[Justin Azoff]

What does your current script look like?

On Thu, Jun 6, 2019 at 12:46 PM Merril Mathew <merril.mathew at baby2body.com>
wrote:

> Hi Justin,
>
> Thanks again. I made the changes you sent and I am getting this error on
> reporter.log. “ 1559839456.472514       Reporter::ERROR field value
> missing [SSH::rec$auth_success]     /usr/local/bro/share/bro/site/alert_ssh_attempt.bro,
> line 22”
>
> But it definitely returns auth_success=F when running on .pcap. I assume
> auth_success will be T when I ssh into the box?
>
> Kind regards,
> Merril.
>
> On 6 Jun 2019, at 17:22, Justin Azoff <justin at corelight.com> wrote:
>
> email_ssh_attempt.bro is not required at all because you already
> added Login_Attempted to Notice::emailed_types in the other script.
>
> Your other script is slightly broken because in the case of unknown result
> the field is not present, so your script needs to look like this.
>
> event log_ssh(rec: Info) &priority=5
> {
>     if(!rec?$auth_success) {
>         NOTICE([$note=SSH::Login_Attempted, $msg=fmt("Unknown")]);
>     }
>     else if(rec$auth_success == F) {
>         NOTICE([$note=SSH::Login_Attempted,
>            $msg=fmt("SSH login attempted from %s, %s many times and
> failed", rec$client, rec$auth_attempts)]);
>     } else {
>         NOTICE([$note=SSH::Login_Attempted,
>            $msg=fmt("SSH login attempted from %s, %s many times and
> succeeded", rec$client, rec$auth_attempts)]);
>     }
> }
>
> if you look at your reporter.log you should see it filled with errors like
> this:
>
> Reporter::ERROR field value missing [SSH::rec$auth_success]
> alert_ssh_attempt_new.bro, line 14
>
>
>
>
> On Thu, Jun 6, 2019 at 12:10 PM Merril Mathew <merril.mathew at baby2body.com>
> wrote:
>
>> Hi All,
>>
>> I cannot figure out why the Notice doesn’t behave as expected on live
>> traffic. I am now trying to make it work with SSH (log_ssh) event as
>> previous attempt on ssh_auth_result lead me nowhere. If I raise the NOTICE
>> function  just after the log_ssh event from a script it sends me email on
>> live traffic. However if I use the NOTICE function inside IF, ELSE IF, ELSE
>> conditionals for auth_success boolean then it does not send me emails.
>> Anyone see what I am doing wrong? I couldn’t figure it out from Notice
>> documentation.
>>
>> Please find attached the scripts for reference.
>>
>> Kind regards,
>> Merril.
>>
>> On 5 Jun 2019, at 18:39, Justin Azoff <justin at corelight.com> wrote:
>>
>> that script should generally work, but it was a lot more complicated than
>> it needed to be to accomplish what you are trying to do.  Here is a much
>> simplified version.
>>
>> The only thing to keep in mind is that since you are using zeek_init to
>> setup the log stream this won't work on bro or a small number of zeek
>> builds from right after the rename.  There are no released versions of zeek
>> so I don't know when you built it.  Using bro_init is backwards compatible
>> and is probably better for now.
>>
>> On Wed, Jun 5, 2019 at 12:46 PM Merril Mathew <
>> merril.mathew at baby2body.com> wrote:
>>
>>> Hi Justin,
>>>
>>> I can confirm that attached scripts does not send me email on live
>>> traffic or create a log under $PREFIX/logs/current. But it does create
>>> notice.log and a SSHAttempt.log when running pcap. I can also confirm that
>>> send mail set up is working as I have received emails from zeek from other
>>> scripts.
>>>
>>> Kind regards,
>>> Merril.
>>>
>>>
>>>
>>> On 5 Jun 2019, at 17:20, Justin Azoff <justin at corelight.com> wrote:
>>>
>>> On Wed, Jun 5, 2019 at 12:11 PM Merril Mathew <
>>> merril.mathew at baby2body.com> wrote:
>>>
>>>> Hi Justin,
>>>>
>>>> Thanks. But it did not work for me.
>>>>
>>>
>>> Did not work how?  Did you post the version of the script that didn't
>>> work?
>>>
>>> --
>>> Justin
>>>
>>>
>>>
>>
>> --
>> Justin
>> <main.zeek>
>>
>>
>>
>
> --
> Justin
>
>
>

-- 
Justin
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