Signing HTTP Messages
draft-richanna-http-message-signatures-00

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HTTPbis Working Group                                    A. Backman, Ed.
Internet-Draft                                                    Amazon
Intended status: Standards Track                               J. Richer
Expires: 14 June 2020                                Bespoke Engineering
                                                               M. Sporny
                                                          Digital Bazaar
                                                        12 December 2019

                         Signing HTTP Messages
               draft-richanna-http-message-signatures-00

Abstract

   This document describes a mechanism for creating, encoding, and
   verifying digital signatures or message authentication codes over
   content within an HTTP message.  This mechanism supports use cases
   where the full HTTP message may not be known to the signer, and where
   the message may be transformed (e.g., by intermediaries) before
   reaching the verifier.

Note

   This draft is based on draft-cavage-http-signatures-12.  The
   community (https://github.com/w3c-dvcg/http-signatures/
   issues?page=2&q=is%3Aissue+is%3Aopen) and the authors have identified
   several issues with the current text.  Additionally, the authors have
   identified a number of features that are required in order to support
   additional use cases.  In order to preserve continuity with the
   effort that has been put into draft-cavage-http-signatures-12, this
   draft maintains normative compatibility with it, and thus does not
   address these issues or include these features, as doing so requires
   making backwards-incompatible changes to normative requirements.
   While such changes are inevitable, the editor recommends that they be
   driven by working group discussion following adoption of the draft
   (see Topics for Working Group Discussion).  The editor requests that
   the working group recognize the intent of this initial draft and this
   recommendation when considering adoption of this draft.

   This note is to be removed before publishing as an RFC.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute

Backman, et al.           Expires 14 June 2020                  [Page 1]
Internet-Draft            Signing HTTP Messages            December 2019

   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on 14 June 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Discussion . . . . . . . . . . . . . . . . .   4
     1.2.  HTTP Message Transformations  . . . . . . . . . . . . . .   5
     1.3.  Safe Transformations  . . . . . . . . . . . . . . . . . .   5
     1.4.  Conventions and Terminology . . . . . . . . . . . . . . .   6
   2.  Identifying and Canonicalizing Content  . . . . . . . . . . .   7
     2.1.  HTTP Header Fields  . . . . . . . . . . . . . . . . . . .   7
     2.2.  Signature Creation Time . . . . . . . . . . . . . . . . .   8
     2.3.  Signature Expiration Time . . . . . . . . . . . . . . . .   9
     2.4.  Target Endpoint . . . . . . . . . . . . . . . . . . . . .   9
   3.  HTTP Message Signatures . . . . . . . . . . . . . . . . . . .  10
     3.1.  Signature Metadata  . . . . . . . . . . . . . . . . . . .  10
     3.2.  Creating a Signature  . . . . . . . . . . . . . . . . . .  11
       3.2.1.  Choose and Set Signature Metadata Properties  . . . .  11
       3.2.2.  Create the Signature Input  . . . . . . . . . . . . .  13
       3.2.3.  Sign the Signature Input  . . . . . . . . . . . . . .  14
     3.3.  Verifying a Signature . . . . . . . . . . . . . . . . . .  14
       3.3.1.  Enforcing Application Requirements  . . . . . . . . .  15