Proof-Of-Possession Semantics for JSON Web Tokens (JWTs)
draft-ietf-oauth-proof-of-possession-02
The information below is for an old version of the document.
| Document | Type | Active Internet-Draft (oauth WG) | |
|---|---|---|---|
| Authors | Michael Jones , John Bradley , Hannes Tschofenig | ||
| Last updated | 2015-03-09 | ||
| Replaces | draft-jones-oauth-proof-of-possession | ||
| Stream | Internet Engineering Task Force (IETF) | ||
| Formats | plain text xml htmlized pdfized bibtex | ||
| Reviews |
SECDIR Telechat review
(of
-07)
Has Issues
|
||
| Stream | WG state | WG Document | |
| Associated WG milestone |
|
||
| Document shepherd | Derek Atkins | ||
| IESG | IESG state | I-D Exists | |
| Consensus boilerplate | Unknown | ||
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | "Derek Atkins" <derek@ihtfp.com> |
draft-ietf-oauth-proof-of-possession-02
OAuth Working Group M. Jones
Internet-Draft Microsoft
Intended status: Standards Track J. Bradley
Expires: September 10, 2015 Ping Identity
H. Tschofenig
ARM Limited
March 9, 2015
Proof-Of-Possession Semantics for JSON Web Tokens (JWTs)
draft-ietf-oauth-proof-of-possession-02
Abstract
This specification defines how to express a declaration in a JSON Web
Token (JWT) that the presenter of the JWT possesses a particular key
and that the recipient can cryptographically confirm proof-of-
possession of the key by the presenter. This property is also
sometimes described as the presenter being a holder-of-key.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 10, 2015.
Copyright Notice
Copyright (c) 2015 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
(http://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
Jones, et al. Expires September 10, 2015 [Page 1]
Internet-Draft proof-of-possession for JWTs March 2015
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. Notational Conventions . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Proof-Of-Possession Representation . . . . . . . . . . . . . . 4
3.1. Proof-of-Possession of an Asymmetric Key . . . . . . . . . 5
3.2. Proof-of-Possession of a Symmetric Key . . . . . . . . . . 5
3.3. Proof-of-Possession Using a Key ID . . . . . . . . . . . . 6
3.4. Confirmation . . . . . . . . . . . . . . . . . . . . . . . 7
3.5. Specifics Intentionally Not Specified . . . . . . . . . . 7
4. Security Considerations . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5.1. JSON Web Token Claims Registration . . . . . . . . . . . . 9
5.1.1. Registry Contents . . . . . . . . . . . . . . . . . . 9
5.2. JWT Confirmation Methods Registry . . . . . . . . . . . . 10
5.2.1. Registration Template . . . . . . . . . . . . . . . . 10
5.2.2. Initial Registry Contents . . . . . . . . . . . . . . 10
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1. Normative References . . . . . . . . . . . . . . . . . . . 11
6.2. Informative References . . . . . . . . . . . . . . . . . . 11
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 12
Appendix B. Document History . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
Jones, et al. Expires September 10, 2015 [Page 2]
Internet-Draft proof-of-possession for JWTs March 2015
1. Introduction
This specification defines how to express a declaration in a JSON Web
Token (JWT) [JWT] that the presenter of the JWT possesses a
particular key and that the recipient can cryptographically confirm
proof-of-possession of the key by the presenter. This property is
also sometimes described as the presenter being a holder-of-key.
Envision the following two use cases. The first use case describes
the use of a symmetric proof-of-possession key and the second use
case uses an asymmetric proof-of-possession key.
An OAuth 2.0 authorization server generates a JWT and places an
encrypted symmetric key inside the newly introduced confirmation
claim. This symmetric key is encrypted with a key known only to the
authorization server and the recipient. The entire JWT is then
integrity protected by the issuer (the authorization server). The
JWT is then sent to the presenter. Since the presenter is unable to
obtain the encrypted symmetric key from the JWT itself, the
authorization server conveys that symmetric key separately to the
presenter. Now, the presenter is in possession of the symmetric key
as well as the JWT (which includes the confirmation claim member).
When the presenter needs to present the JWT to the recipient, it also
needs to demonstrate possession of the symmetric key; the presenter,
for example, uses the symmetric key in a challenge/response protocol
with the recipient. The recipient is then able to verify that it is
interacting with the genuine presenter by decrypting the JWK
contained inside the confirmation claim of the JWT. By doing this,
the recipient obtains the symmetric key, which it then uses to verify
cryptographically protected messages exchanged with the presenter.
This symmetric key mechanism described above is conceptually similar
to the use of Kerberos tickets.
In the second case, consider a presenter that generates a public/
private key pair. It then sends the public key to an OAuth 2.0
authorization server (the issuer), which creates a JWT and places a
public key (or an identifier for it) inside the newly introduced
confirmation claim. The entire JWT is integrity protected using a
digital signature to protect it against modifications. The JWT is
then sent to the presenter. When the presenter needs to present the
JWT to the recipient, it also needs to demonstrate possession of the
private key. The presenter, for example, uses the private key in a
TLS exchange with the recipient. The recipient is able to verify
that it is interacting with the genuine presenter by extracting the
public key from the confirmation claim of the JWT (after verifying
the digital signature of the JWT) and utilizing it with the private
key in the TLS exchange. The asymmetric key mechanism described
above is conceptually similar to a certificate.
Jones, et al. Expires September 10, 2015 [Page 3]
Internet-Draft proof-of-possession for JWTs March 2015
In both cases the JWT may contain other claims that are needed by the
application.
1.1. Notational 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 RFC
2119 [RFC2119].
Unless otherwise noted, all the protocol parameter names and values
are case sensitive.
2. Terminology
This specification uses terms defined in the JSON Web Token (JWT)
[JWT], JSON Web Key (JWK) [JWK], and JSON Web Encryption (JWE) [JWE]
specifications.
These terms are defined by this specification:
Issuer
Party that creates the JWT and binds the proof-of-possession key
to it.
Presenter
Party that proves possession of a private key (for asymmetric key
cryptography) or secret key (for symmetric key cryptography) to a
recipient. The presenter may be the issuer or a party different
from the issuer.
Recipient
Party that receives the JWT containing the proof-of-possession key
information from the presenter.
3. Proof-Of-Possession Representation
The presenter of a JWT declares that it possesses a particular key
and that the recipient can cryptographically confirm proof-of-
possession of the key by the presenter by including a "cnf"
(confirmation) claim in the JWT whose value is a JSON object, with
the JSON object containing a "jwk" (JSON Web Key) or "kid" (key ID)
member identifying the key.
The presenter can be identified in one of two ways by the JWT,
depending upon the application requirements. If the JWT contains a
Jones, et al. Expires September 10, 2015 [Page 4]
Internet-Draft proof-of-possession for JWTs March 2015
"sub" (subject) claim, the presenter is the subject identified by the
JWT. (In some applications, the subject identifier will be relative
to the issuer identified by the "iss" (issuer) claim.) If the JWT
contains no "sub" (subject) claim, the presenter is the issuer
identified by the JWT using the "iss" (issuer) claim. The case in
which the presenter is the subject of the JWT is analogous to SAML
2.0 [OASIS.saml-core-2.0-os] SubjectConfirmation usage. At least one
of the "sub" and "iss" claims MUST be present in the JWT, and in some
use cases, both MUST be present.
3.1. Proof-of-Possession of an Asymmetric Key
When the key held by the presenter is an asymmetric private key, the
value of the "jwk" member is a JSON Web Key (JWK) [JWK] representing
the corresponding asymmetric public key. The following example
demonstrates such a declaration in the JWT Claims Set of a JWT:
{
"iss": "https://server.example.com",
"aud": "https://client.example.org",
"exp": "1361398824",
"nbf": "1360189224",
"cnf":{
"jwk":{
"kty": "EC",
"use": "sig",
"crv": "P-256",
"x": "18wHLeIgW9wVN6VD1Txgpqy2LszYkMf6J8njVAibvhM",
"y": "-V4dS4UaLMgP_4fY4j8ir7cl1TXlFdAgcx55o7TkcSA"
}
}
}
The JWK MUST contain the required key members for a JWK of that key
type and MAY contain other JWK members, including the "kid" (key ID)
member.
3.2. Proof-of-Possession of a Symmetric Key
When the key held by the presenter is a symmetric key, the value of
the "jwk" member is an encrypted JSON Web Key (JWK) [JWK] encrypted
to a key known to the recipient using the JWE Compact Serialization
containing the symmetric key. The rules for encrypting a JWK are
found in Section 6 of the JSON Web Key [JWK] specification.
The following example illustrates a symmetric key that could
subsequently be encrypted for use in the "jwk" member:
Jones, et al. Expires September 10, 2015 [Page 5]
Internet-Draft proof-of-possession for JWTs March 2015
{
"kty": "oct",
"alg": "HS256",
"k": "ZoRSOrFzN_FzUA5XKMYoVHyzff5oRJxl-IXRtztJ6uE"
}
The UTF-8 [RFC3629] encoding of this JWK would be used as the JWE
Plaintext when encrypting the key.
The following example is a JWE Header that could be used when
encrypting this key:
{
"alg": "RSA1_5",
"enc": "A128CBC-HS256",
"cty": "jwk+json"
}
The following example JWT Claims Set of a JWT illustrates the use of
an encrypted symmetric key as the "jwk" claim value:
{
"iss": "https://server.example.com",
"sub": "24400320",
"aud": "s6BhdRkqt3",
"nonce": "n-0S6_WzA2Mj",
"exp": 1311281970,
"iat": 1311280970,
"cnf":{
"jwk":
"eyJhbGciOiJSU0ExXzUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiY3R5Ijoi
andrK2pzb24ifQ. ... (remainder of JWE omitted for brevity)"
}
}
Note that the case in which the "jwk" claim contains an unencoded JWK
value and the case in which it contains an encrypted JWK value can be
distinguished by the type of the member value. In the first case,
the value is a JSON object containing the JWK and in the second case,
the value is a string containing the JWE JSON Serialization of the
encrypted JWK representation.
3.3. Proof-of-Possession Using a Key ID
The proof-of-possession key can also be identified by the use of a
Key ID instead of communicating the actual key, provided the
recipient is able to obtain the identified key using the Key ID. In
this case, the presenter of a JWT declares that it possesses a
Jones, et al. Expires September 10, 2015 [Page 6]
Internet-Draft proof-of-possession for JWTs March 2015
particular key and that the recipient can cryptographically confirm
proof-of-possession of the key by the presenter by including a "cnf"
(confirmation) claim in the JWT whose value is a JSON object, with
the JSON object containing a "kid" (key ID) member identifying the
key.
The following example demonstrates such a declaration in the JWT
Claims Set of a JWT:
{
"iss": "https://server.example.com",
"aud": "https://client.example.org",
"exp": "1361398824",
"nbf": "1360189224",
"cnf":{
"kid": "dfd1aa97-6d8d-4575-a0fe-34b96de2bfad"
}
}
3.4. Confirmation
The "cnf" (confirmation) claim is used in the JWT to contain the
"jwk" or "kid" member because a proof-of-possession key may not be
the only means of confirming the authenticity of the token. This is
analogous to the SAML 2.0 [OASIS.saml-core-2.0-os]
SubjectConfirmation element, in which a number of different subject
confirmation methods can be included, including proof-of-possession
key information. When a recipient receives a "cnf" claim with a
member that it does not understand, it MUST ignore that member.
This specification defines a registry for these members in
Section 5.2 and registers the "jwk" and "kid" members within the
registry.
3.5. Specifics Intentionally Not Specified
Proof-of-possession is typically demonstrated by having the presenter
sign a value determined by the recipient using the key possessed by
the presenter. This value is sometimes called a "nonce" or a
"challenge".
The means of communicating the nonce and the nature of its contents
are intentionally not described in this specification, as different
protocols will communicate this information in different ways.
Likewise, the means of communicating the signed nonce is also not
specified, as this is also protocol-specific.
Note that another means of proving possession of the key when it is a
Jones, et al. Expires September 10, 2015 [Page 7]
Internet-Draft proof-of-possession for JWTs March 2015
symmetric key is to encrypt the key to the recipient. The means of
obtaining a key for the recipient is likewise protocol-specific.
For an example specification that uses the mechanisms defined in this
document, see [I-D.ietf-oauth-pop-architecture].
4. Security Considerations
All of the normal security issues, especially in relationship to
comparing URIs and dealing with unrecognized values, that are
discussed in JWT [JWT] also apply here.
In addition, proof-of-possession introduces its own unique security
issues. Possessing the key is only valuable if it is kept secret.
Appropriate means must be used to ensure that unintended parties do
not learn the private key or symmetric key value.
Proof-of-possession via encrypted symmetric secrets is subject to
replay attacks. This attack can be avoided when a signed nonce or
challenge is used, since the recipient can use a distinct nonce or
challenged for each interaction.
Similarly to other information included in a JWT, it is necessary to
apply data origin authentication and integrity protection (via a
keyed message digest or a digital signature). Data origin
authentication ensures that the recipient of the JWT learns about the
entity that created the JWT, since this will be important for any
policy decisions. Integrity protection prevents an adversary from
changing any elements conveyed within the JWT payload. Special care
has to be applied when carrying symmetric keys inside the JWT, since
those not only require integrity protection, but also confidentiality
protection.
A recipient may not understand the newly introduced "cnf" claim and
may consequently treat it as a bearer token. While this is a
legitimate concern, it is outside the scope of this specification,
since demonstration the possession of the key associated with the
"cnf" claim is not covered by this specification. For more details,
please consult [I-D.ietf-oauth-pop-architecture].
5. IANA Considerations
The following registration procedure is used for all the registries
established by this specification.
Values are registered with a Specification Required [RFC5226] after a
Jones, et al. Expires September 10, 2015 [Page 8]
Internet-Draft proof-of-possession for JWTs March 2015
three-week review period on the [TBD]@ietf.org mailing list, on the
advice of one or more Designated Experts. However, to allow for the
allocation of values prior to publication, the Designated Expert(s)
may approve registration once they are satisfied that such a
specification will be published.
Registration requests must be sent to the [TBD]@ietf.org mailing list
for review and comment, with an appropriate subject (e.g., "Request
for access token type: example"). [[ Note to the RFC Editor: The name
of the mailing list should be determined in consultation with the
IESG and IANA. Suggested name: oauth-pop-reg-review@ietf.org. ]]
Within the review period, the Designated Expert(s) will either
approve or deny the registration request, communicating this decision
to the review list and IANA. Denials should include an explanation
and, if applicable, suggestions as to how to make the request
successful. Registration requests that are undetermined for a period
longer than 21 days can be brought to the IESG's attention (using the
iesg@ietf.org mailing list) for resolution.
Criteria that should be applied by the Designated Expert(s) includes
determining whether the proposed registration duplicates existing
functionality, determining whether it is likely to be of general
applicability or whether it is useful only for a single application,
and whether the registration makes sense.
IANA must only accept registry updates from the Designated Expert(s)
and should direct all requests for registration to the review mailing
list.
It is suggested that multiple Designated Experts be appointed who are
able to represent the perspectives of different applications using
this specification, in order to enable broadly-informed review of
registration decisions. In cases where a registration decision could
be perceived as creating a conflict of interest for a particular
Expert, that Expert should defer to the judgment of the other
Expert(s).
5.1. JSON Web Token Claims Registration
This specification registers the "cnf" claim in the IANA JSON Web
Token Claims registry defined in [JWT].
5.1.1. Registry Contents
o Claim Name: "cnf"
Jones, et al. Expires September 10, 2015 [Page 9]
Internet-Draft proof-of-possession for JWTs March 2015
o Claim Description: Confirmation
o Change Controller: IESG
o Specification Document(s): Section 3.4 of this document
5.2. JWT Confirmation Methods Registry
This specification establishes the IANA JWT Confirmation Methods
registry for JWT "cnf" member values. The registry records the
confirmation method member and a reference to the specification that
defines it.
5.2.1. Registration Template
Confirmation Method Value:
The name requested (e.g., "example"). Because a core goal of this
specification is for the resulting representations to be compact,
it is RECOMMENDED that the name be short -- not to exceed 8
characters without a compelling reason to do so. This name is
case-sensitive. Names may not match other registered names in a
case-insensitive manner unless the Designated Expert(s) state that
there is a compelling reason to allow an exception in this
particular case.
Confirmation Method Description:
Brief description of the confirmation method (e.g., "Example
description").
Change Controller:
For Standards Track RFCs, state "IESG". For others, give the name
of the responsible party. Other details (e.g., postal address,
email address, home page URI) may also be included.
Specification Document(s):
Reference to the document(s) that specify the parameter,
preferably including URI(s) that can be used to retrieve copies of
the document(s). An indication of the relevant sections may also
be included but is not required.
5.2.2. Initial Registry Contents
o Confirmation Method Value: "jwk"
o Confirmation Method Description: JSON Web Key or Encrypted JSON
Web Key
o Change Controller: IESG
o Specification Document(s): Section 3.1 of [[ this document ]]
Jones, et al. Expires September 10, 2015 [Page 10]
Internet-Draft proof-of-possession for JWTs March 2015
o Confirmation Method Value: "kid"
o Confirmation Method Description: Key Identifier
o Change Controller: IESG
o Specification Document(s): Section 3.3 of [[ this document ]]
6. References
6.1. Normative References
[JWE] Jones, M. and J. Hildebrand, "JSON Web Encryption (JWE)",
draft-ietf-jose-json-web-encryption (work in progress),
January 2015.
[JWK] Jones, M., "JSON Web Key (JWK)",
draft-ietf-jose-json-web-key (work in progress),
January 2015.
[JWT] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
(JWT)", draft-ietf-oauth-json-web-token (work in
progress), December 2014.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO
10646", STD 63, RFC 3629, November 2003.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
6.2. Informative References
[I-D.ietf-oauth-pop-architecture]
Hunt, P., ietf@justin.richer.org, i., Mills, W., Mishra,
P., and H. Tschofenig, "OAuth 2.0 Proof-of-Possession
(PoP) Security Architecture",
draft-ietf-oauth-pop-architecture-01 (work in progress),
March 2015.
[OASIS.saml-core-2.0-os]
Cantor, S., Kemp, J., Philpott, R., and E. Maler,
"Assertions and Protocol for the OASIS Security Assertion
Markup Language (SAML) V2.0", OASIS Standard saml-core-
2.0-os, March 2005.
Jones, et al. Expires September 10, 2015 [Page 11]
Internet-Draft proof-of-possession for JWTs March 2015
Appendix A. Acknowledgements
The authors wish to thank James Manger for his review of the
specification.
Appendix B. Document History
[[ to be removed by the RFC Editor before publication as an RFC ]]
-02
o Defined the terms Issuer, Presenter, and Recipient and updated
their usage within the document.
o Added a description of a use case using an asymmetric proof-of-
possession key to the introduction.
o Added the "kid" (key ID) confirmation method.
o These changes address the open issues identified in the previous
draft.
-01
o Updated references.
-00
o Created the initial working group draft from
draft-jones-oauth-proof-of-possession-02.
Authors' Addresses
Michael B. Jones
Microsoft
Email: mbj@microsoft.com
URI: http://self-issued.info/
John Bradley
Ping Identity
Email: ve7jtb@ve7jtb.com
URI: http://www.thread-safe.com/
Jones, et al. Expires September 10, 2015 [Page 12]
Internet-Draft proof-of-possession for JWTs March 2015
Hannes Tschofenig
ARM Limited
Austria
Email: Hannes.Tschofenig@gmx.net
URI: http://www.tschofenig.priv.at
Jones, et al. Expires September 10, 2015 [Page 13]