Clarify Authorization Domain Name #627
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Simplify the definition of ADN and move the algorithm in 3.2.2.4. Define Base Domain Name as a function of any given FQDN. Move the definition of Domain Contact into the only remaining method that uses it. Simplify the language in each method around pruning labels and wildcard issuance. Add corresponding language about following CNAMEs when choosing the ADN, and around onion issuance. Use "ADN" consistently in method definitions instead of "FQDN" (which is insufficiently precise as to whether it's the applied-for FQDN or the ADN). Clean up the language in the onion section around ADNs. Replace retired methods with language saying they are retired.
aarongable
reviewed
Oct 30, 2025
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Simplify the definition of ADN and move the algorithm in 3.2.2.4. Choosing an ADN is a precursor to doing validation. Every validation operates on an ADN.
Simplify the language in each method around pruning labels and wildcard issuance. Add corresponding language about following CNAMEs when choosing the ADN, and around onion issuance.
Require record keeping when choosing the ADN.
Replace retired methods with language saying they are retired.
Define Base Domain Name as a function of any given FQDN.
Move the definition of Domain Contact into the only remaining method that uses it (3.2.2.4.12 Validating Applicant as a Domain Contact). Note that this method does not allow CNAME lookups when choosing the ADN, because it previously relied on Base Domain Name, which previously had the language "applied-for FQDN".
Use "ADN" consistently in method definitions instead of "FQDN" (which is insufficiently precise as to whether it's the applied-for FQDN or the ADN).
Clean up the language in the onion section around ADNs.
Here's a table of the methods and what ADN operations can happen on them according to this PR (plus onion issuance):
This is a more in-depth follow-up to #619. It's bigger than I had hoped, but pulling on one thread pulls on many others.