[getdns-api] DANE with dnssec_return_only_secure extension

[Willem Toorop]

Dear list,

Could you advice me on this...

The dnssec_return_only_secure extension seems on first sight an ideal
fit for looking up DANE records.

DANE records (like TLSA) MUST be used when they can be retrieved
securely.  The dnssec_return_only_secure will return with status
GETDNS_RESPSTATUS_GOOD and the answers MUST be use to validate a secure
session.  Good!

On insecure answers (either existing or non-existing), the
dnssec_return_only_secure extension makes requests return
GETDNS_RESPSTATUS_NO_SECURE_ANSWERS.  DANE records MUST and ordinary
PKIX should proceed.  Also good!

On non-existing secure answers, the dnssec_return_only_secure extension
makes requests return GETDNS_RESPSTATUS_NO_NAME.  We should proceed with
normal PKIX now too.  Fine!

On bogus answers, the dnssec_return_only_secure extension makes requests
also returns GETDNS_RESPSTATUS_NO_NAME .  This is inconvenient, because
in this case we should not proceed with PKIX, but no secure session
should be set up at all!  Not good.

In that last case we must also enable the dnssec_return_validation_chain
extension to be able to peek at the packets to see if none was bogus in
case of GETDNS_RESPSTATUS_NO_NAME .

What about another return status: "GETDNS_RESPSTATUS_ALL_BOGUS_ANSWERS"?

I'd very much like to hear your opinions.

Cheers,

-- Willem
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