A new Request for Comments is now available in online RFC libraries.
RFC 9908
Title: Clarification and Enhancement of the
CSR Attributes Definition in RFC 7030
Author: M. Richardson, Ed.,
O. Friel,
D. von Oheimb,
D. Harkins
Status: Standards Track
Stream: IETF
Date: January 2026
Mailbox: [email protected],
[email protected],
[email protected],
[email protected]
Pages: 22
Updates: RFC 7030, RFC 9148
I-D Tag: draft-ietf-lamps-rfc7030-csrattrs-23.txt
URL: https://www.rfc-editor.org/info/rfc9908
DOI: 10.17487/RFC9908
This document updates RFC 7030, "Enrollment over Secure Transport"
(EST), clarifying how the Certificate Signing Request (CSR)
Attributes Response can be used by an EST server to specify both CSR
attribute Object Identifiers (OIDs) and CSR attribute values,
particularly X.509 extension values, that the server expects the
client to include in a subsequent CSR request. RFC 9148 is derived
from RFC 7030 and is also updated.
RFC 7030 is ambiguous in its specification of the CSR Attributes
Response. This has resulted in implementation challenges and
implementor confusion because there was no universal understanding of
what was specified. This document clarifies the encoding rules.
This document also provides a new straightforward approach: using a
template for CSR contents that may be partially filled in by the
server. This also allows an EST server to specify a subject
Distinguished Name (DN).
This document is a product of the Limited Additional Mechanisms for PKIX and
SMIME Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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