[Bro] SSL Question

Johanna Amann johanna at icir.org
Wed Jun 8 19:45:30 PDT 2016


The server message sent to the client, including p, g, and Ys is 
available in the event ssl_dh_server_params: 
https://www.bro.org/sphinx/scripts/base/bif/plugins/Bro_SSL.events.bif.bro.html#id-ssl_dh_server_params

I hope this helps,
  Johanna

On 8 Jun 2016, at 19:33, Ben Mixon-Baca wrote:

> I am trying to determine if the prime being used is from apache's
> mod_ssl. I didn't know if it was possible to use some field available 
> in
> the Cert record or another record to determine the prime implicitly
> since they are public.
>
> On 06/08/2016 07:01 PM, Slagell, Adam J wrote:
>> I don’t think you mean to ask what you are asking. In regular DH 
>> over a finite field, the prime that determines the group is not even 
>> secret or terribly interesting.
>>
>> Stepping back a bit, what are you trying to accomplish?
>>
>> :Adam
>>> On Jun 8, 2016, at 8:53 PM, Ben Mixon-Baca <bmixonb1 at cs.unm.edu> 
>>> wrote:
>>>
>>> Does Bro make the server's prime it sent to a client in the diffie
>>> hellman key exchange visible?
>>>
>>> For example, if a client on my network is talking to an apache 
>>> server,
>>> would I be able to print the prime the server sends to the client?
>>> -- 
>>> Ben
>>>
>>> _______________________________________________
>>> Bro mailing list
>>> bro at bro-ids.org
>>> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/bro
>>
>> ------
>>
>> Adam J. Slagell
>> Chief Information Security Officer
>> Director, Cybersecurity Division
>> National Center for Supercomputing Applications
>> University of Illinois at Urbana-Champaign
>> www.slagell.info
>>
>> "Under the Illinois Freedom of Information Act (FOIA), any written 
>> communication to or from University employees regarding University 
>> business is a public record and may be subject to public disclosure."
>>
>>
>>
>>
>>
>>
>>
>>
>
> -- 
> Ben
>
> _______________________________________________
> Bro mailing list
> bro at bro-ids.org
> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/bro



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