[Bro] SSL Decrypt + SMTP

Johanna Amann johanna at icir.org
Mon Dec 1 13:28:21 PST 2014

Hello Joe,

> I was hoping someone has done this before, but we're trying to log our SMTP
> connections which we decrypt.  In the packets, you'll see STARTTLS, but
> everything after that is clear text.
> Does anyone have a good mechanism for allowing the indexing to go past the
> STARTTLS?  I was thinking about changing/removing this, but wanted to
> consult the list before going too far:
> // If an TLS transaction has been initiated, forward to child and abort. if (
> state == SMTP_IN_TLS ) { ForwardStream(length, line, orig); return; }
> The underlying packets are the same as regular SMTP, they're just being
> decrypted by an appliance.

The easy fix should be to remove the call to StartTLS() in line 768. This
will prevent the state to be set to SMTP_IN_TLS, and also keep the support
analyzers that the call removes if a TLS connection is started.


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