[Bro] Information on OCSP and CRL

Johanna Amann johanna at icir.org
Tue Feb 14 13:15:25 PST 2017

To expand a bit on this...

there is a policy script to perform certificate validation, just load
policy/protocols/ssl/validate-certs.bro. Note that this uses plain OpenSSL
for validation and might not be able to validate a few cases which
browsers can validate.

For OCSP, the situation is a bit less optimal. The script that Vlad
mentioned performs OCSP validation, but _only_ in case that the OCSP
response is sent stapled in the TLS handshake - which is rather rare.

Outside of this, Bro currently does not support OCSP validatiob.


On Thu, Feb 09, 2017 at 01:37:44PM -0600, Vlad Grigorescu wrote:
> Tony,
> There's an optional script for OCSP validation:
> https://github.com/bro/bro/blob/v2.5/scripts/policy/protocols/ssl/validate-ocsp.bro
> To use:
> > @load protocols/ssl/validate-ocsp
>   --Vlad
> Tony Waller <twaller at bivio.net> writes:
> > I am looking for additional information on utilizing OCSP and CRL in Bro NSM. I would like to know if certificates from clients can be checked in real-time or near real-time against a CRL? Also, can Bro NSM perform a OCSP request to a RA and check a certificate to determine if it is valid? If this is the case where in Bro NSM do you set the address for the RA or CRL responder?
> >
> > Sincerely,
> >
> > Tony
> >
> >
> > Tony Waller, CISSP
> > Director, Systems Engineering
> > Bivio Networks, Inc.
> > “Powering Advanced Cyber Operations” (TM)
> > Mobile (443) 994-0936
> >
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