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slight rewrite of explanation of _ underscore protection #64

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merged 3 commits into from
Aug 21, 2024
Merged

slight rewrite of explanation of _ underscore protection #64

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84b86eb
slight rewrite of explanation of _ underscore protection
mcr Aug 15, 2024
b32c072
fix grammar
mcr Aug 21, 2024
0c68e63
fix typo in I-D name
mcr Aug 21, 2024
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10 changes: 7 additions & 3 deletions draft-ietf-dance-architecture.md
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Expand Up @@ -418,9 +418,13 @@ Compartmentalizing failure domains within an application is a well-known archite
Within the context of protecting DNS-based identities, this compartmentalization may manifest by hosting an identity zone on a DNS server which only supports the resource record types essential for representing device identities.
This can prevent a compromised identity zone DNS server from presenting records essential for impersonating web sites under the organization’s domain name.

The naming pattern suggested in <https://datatracker.ietf.org/doc/html/draft-huque-dane-client-cert> includes
an underscore label (_device) which also prevents the issuance of Web PKI-validating certificates in the
event a DNS server hosting a client identity zone, which is capable of presenting A and AAAA records, is compromised.
The naming pattern suggested in {{I-D.ietf-dance-client-auth}} includes
an underscore label (_device).
The underscore is not a valid character for names used in the Web PKI.
This prevents the issuance of any Web PKI-validating certificates for these names.

This means that even were the authoritative DNS server compromised, it would not be possible to issue Web PKI certificates using, for instance, the {{?RFC8555}} DNS-01 challenge.

An alternative underscore label _user separates the TLSA records with the domain CA from the TLSA records for devices.

## Availability
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