The receipt verification checks the signature using a certificate. That certificated is loaded from the JWK. So that means we'll verify using any certificate passed to us. We should whitelist that for mozilla domains only. (and check ssl certs on the way).
Verified for me, basically receipts should still work.
Ryan, can you give us an example of how a receipt might have chained certs? What is the use case for chains? Would the marketplace cert always be at the root of the chain or could it be in other positions? I am concerned that we are only whitelisting the cert at the root of the chain: https://github.com/andymckay/receipts/commit/c5555b39164f03a604c6dd9a677155c476dfcd1d#L1R167 This seems error prone.