[http-auth] [Technical Errata Reported] RFC7804 (5496)

RFC Errata System <rfc-editor@rfc-editor.org> Sat, 08 September 2018 13:51 UTC

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Subject: [http-auth] [Technical Errata Reported] RFC7804 (5496)
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The following errata report has been submitted for RFC7804,
"Salted Challenge Response HTTP Authentication Mechanism".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5496

--------------------------------------
Type: Technical
Reported by: Peter Occil <poccil14@gmail.com>

Section: 2.2

Original Text
-------------
   o  Normalize(str): Apply the Preparation and Enforcement steps
      according to the OpaqueString profile (see [RFC7613]) to a UTF-8
      [RFC3629] encoded "str".  The resulting string is also in UTF-8.
      Note that implementations MUST either implement OpaqueString
      profile operations from [RFC7613] or disallow the use of non
      US-ASCII Unicode codepoints in "str".  The latter is a particular
      case of compliance with [RFC7613].


Corrected Text
--------------
   o  Normalize(str): Apply the Preparation and Enforcement steps
      according to the OpaqueString profile (see [RFC7613]) to a UTF-8
      [RFC3629] encoded "str".  The resulting string is also in UTF-8.
      Note that implementations MUST either implement OpaqueString
      profile operations from [RFC7613] or disallow the use of Unicode 
      codepoints not ranging from U+0020 to U+007E in "str".  The latter
      is a particular case of compliance with [RFC7613].


Notes
-----
Control code points (including the ASCII controls U+0000 to U+001F as well as U+007F) are disallowed in the PRECIS FreeformClass, which the OpaqueString profile uses.  Thus it's not enough to just disallow non-US-ASCII codepoints (rather than implement the full OpaqueString profile) to comply with a subset of the OpaqueString profile.

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--------------------------------------
RFC7804 (draft-ietf-httpauth-scram-auth-15)
--------------------------------------
Title               : Salted Challenge Response HTTP Authentication Mechanism
Publication Date    : March 2016
Author(s)           : A. Melnikov
Category            : EXPERIMENTAL
Source              : Hypertext Transfer Protocol Authentication
Area                : Security
Stream              : IETF
Verifying Party     : IESG