[cabf_validation] Question about MPDV and CAA

Pedro FUENTES pfuentes at WISEKEY.COM
Fri Jun 16 10:43:32 UTC 2023

Sorry as most likely this has been already discussed, but as I came “late to the party”, there are things that I surely missed.

About the need to consider CAA also in the MPDV… I’m thinking about this and I fail to see the risk we’re managing by doing it. My rational is that MPDV, once verifies the domain ownership/control, would also imply that records in the DNS (i.e. CAA) are legit.

The only situation I see where this could apply, is when someone could trick a CAA record during the reuse period of a previously validated domain, so MPDV could verify proper domain control, but the CAA check that must be done for each issuance is faked, but I’d say that faking the CAA could have as only logic purpose to enable another CA to issue the certificate, and that CA would also need to check the domain control using MPDV.

When you decided to include CAA in the game… what was the logic behind?

Most likely there’s a good reason that clever people has discussed already, so I’d appreciate if you can help me understand better.


Pedro Fuentes
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