OAuth Working Group M. Jones
Internet-Draft Microsoft
Intended status: Standards Track B. Campbell, Ed.
Expires: September 10, 2020 Ping Identity
J. Bradley
Yubico
March 9, 2020
OAuth 2.0 DPoP for the Implicit Flow
draft-jones-oauth-dpop-implicit-00
Abstract
This specification describes a mechanism for sender-constraining
OAuth 2.0 tokens via a proof-of-possession mechanism on the
application level. This mechanism allows for the detection of replay
attacks with access tokens.
This specification compliments and builds upon the mechanisms defined
in draft-fett-oauth-dpop, in which access tokens are returned from
the token endpoint. In particular, this specification extends the
Demonstration of Proof-of-Possession at the Application Layer (DPoP)
mechanisms to also be usable with the OAuth 2.0 implicit flow, in
which access tokens are returned from the authorization endpoint.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 10, 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Notation and Conventions . . . . . . . . . . 2
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. DPoP for the Implicit Flow . . . . . . . . . . . . . . . . . 3
2.1. DPoP OAuth Request Parameter . . . . . . . . . . . . . . 3
2.2. DPoP Proof JWT for the Implicit Flow . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
4.1. OAuth Parameters Registration . . . . . . . . . . . . . . 3
4.1.1. Registry Contents . . . . . . . . . . . . . . . . . . 4
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Normative References . . . . . . . . . . . . . . . . . . 4
5.2. Informative References . . . . . . . . . . . . . . . . . 4
Appendix A. Document History . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
This specification defines additions to the mechanisms defined in
[I-D.fett-oauth-dpop] enabling Demonstration of Proof-of-Possession
at the Application Layer (DPoP) mechanisms to be used with the OAuth
2.0 implicit flow, in which access tokens are returned from the
authorization endpoint. These additions are intended for use with
these "response_type" values: "token", "id_token token",
"code token", and "code id_token token".
1.1. Requirements Notation and Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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1.2. Terminology
This specification uses the terms "access token", "authorization
endpoint", "authorization request", and "token endpoint" defined by
The OAuth 2.0 Authorization Framework [RFC6749].
2. DPoP for the Implicit Flow
Demonstration of Proof-of-Possession at the Application Layer (DPoP)
for the implicit flow is performed in the same manner as
[I-D.fett-oauth-dpop], with this exception: Rather than sending the
DPoP proof JWT in a DPoP HTTP header, the DPoP proof JWT is instead
sent as the value the new "dpop" OAuth request parameter, which is
defined in this section.
2.1. DPoP OAuth Request Parameter
This specification defines the following OAuth request parameter for
use at the authorization endpoint:
dpop
The DPoP proof JWT for requests using the implicit flow.
2.2. DPoP Proof JWT for the Implicit Flow
DPoP proof JWTs used with the implicit flow are as specified in
[I-D.fett-oauth-dpop], with the following modifications.
o The value of the "htm" claim MUST be the HTTP verb used in the
authorization request, which is normally "GET".
o The value of the "htu" claim MUST be the URL of the authorization
endpoint used in the request.
3. Security Considerations
The security considerations described in [I-D.fett-oauth-dpop] also
apply to this specification.
4. IANA Considerations
4.1. OAuth Parameters Registration
This specification registers the following value in the IANA "OAuth
Parameters" registry [IANA.OAuth.Parameters] established by
[RFC6749].
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4.1.1. Registry Contents
o Parameter name: dpop
o Parameter usage location: authorization request
o Change controller: IESG
o Specification document(s): Section 2.1 of [[ this specification ]]
5. References
5.1. Normative References
[I-D.fett-oauth-dpop]
Fett, D., Campbell, B., Bradley, J., Lodderstedt, T.,
Jones, M., and D. Waite, "OAuth 2.0 Demonstration of
Proof-of-Possession at the Application Layer (DPoP)",
draft-fett-oauth-dpop-04 (work in progress), March 2020.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC6749] Hardt, D., Ed., "The OAuth 2.0 Authorization Framework",
RFC 6749, DOI 10.17487/RFC6749, October 2012,
<https://www.rfc-editor.org/info/rfc6749>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
5.2. Informative References
[IANA.OAuth.Parameters]
IANA, "OAuth Parameters",
<http://www.iana.org/assignments/oauth-parameters>.
Appendix A. Document History
[[ to be removed by the RFC Editor before publication as an RFC ]]
-00
o Initial version.
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Authors' Addresses
Michael B. Jones
Microsoft
Email: mbj@microsoft.com
URI: https://self-issued.info/
Brian Campbell (editor)
Ping Identity
Email: brian.d.campbell@gmail.com
John Bradley
Yubico
Email: ve7jtb@ve7jtb.com
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