The W3C WebAuthn and FIDO 2.0 standards have won the 2019 European Identity and Cloud Award for Best Future Technology / Standard Project at the European Identity and Cloud (EIC) conference. This award recognizes the significance of these recently-approved standards, which enable password-less sign-in with platform authenticators, mobile devices, and security keys. They provide a huge step forward for online security, privacy, and convenience.
Thanks to Kuppinger Cole for recognizing the importance and impact of these important new standards!
I’m excited that a new, simpler approach for application-level proof of possession of OAuth access tokens and refresh tokens is being developed by members of the IETF OAuth working group. The effort is led by Daniel Fett, who had previously done formal analysis of the OAuth protocol. I wanted to bring it to your attention now to solicit your early feedback. This approach was designed in discussions at the Fourth OAuth Security Workshop and is captured in a new individual draft specification for Demonstration of Proof-of-Possession (DPoP) intended for the OAuth working group. The abstract of the new specification is:
This document describes a mechanism for sender-constraining OAuth 2.0 tokens via a proof-of-possession mechanism on the application level. This mechanism allows to detect replay attacks with access and refresh tokens.
I’m pleased to report that the IETF COSE Working Group has adopted the specification “COSE and JOSE Registrations for WebAuthn Algorithms”. An abstract of what it does is:
This specification defines how to use several algorithms with COSE [RFC8152] that are used by implementations of the W3C Web Authentication (WebAuthn) [WebAuthn] and FIDO2 Client to Authenticator Protocol (CTAP) [CTAP] specifications. These algorithms are to be registered in the IANA “COSE Algorithms” registry [IANA.COSE.Algorithms] and also in the IANA “JSON Web Signature and Encryption Algorithms” registry [IANA.JOSE.Algorithms], when not already registered there.
The two Security Event Token (SET) delivery specifications have been updated to address working group feedback received, in preparation for discussions at IETF 104 in Prague. The Push Delivery spec went through working group last call (WGLC). It has been updated to incorporate the WGLC comments. Changes made are summarized in the spec change log, the contents of which were also posted to the working group mailing list. Thanks to Annabelle Backman for the edits to the Push Delivery spec.
Responding to feedback from multiple parties that the title “OAuth 2.0 Device Flow for Browserless and Input Constrained Devices” was too much of a mouthful, the title of the specification has been simplified to “OAuth 2.0 Device Authorization Grant”. Likewise, we received feedback that “Device flow” was an insider term that caused more confusion than clarity, so its use has been removed from the specification. Finally, last minute feedback was received that client authorization and error handling were not explicitly spelled out. The specification now says that these occur in the same manner as in OAuth 2.0 [RFC 6749].
Many thanks to William Denniss for performing these edits! Hopefully this will be the draft that is sent to the RFC Editor.
I have written draft-jones-cose-additional-algorithms, which combines these starting points into a single draft, which registers these algorithms in the IANA COSE registries. When not already registered, this draft also registers these algorithms for use with JOSE in the IANA JOSE registries. I believe that this draft is ready for working group adoption to satisfy this deliverable.
I’m thrilled to report that the Web Authentication (WebAuthn) specification is now a W3C standard! See the W3C press release describing this major advance in Web security and convenience, which enables logging in without passwords. Alex Simons, Microsoft Vice President of Identity Program Management is quoted in the release, saying:
“Our work with W3C and FIDO Alliance, and contributions to FIDO2 standards have been a critical piece of Microsoft’s commitment to a world without passwords, which started in 2015. Today, Windows 10 with Microsoft Edge fully supports the WebAuthn standard and millions of users can log in to their Microsoft account without using a password.”
The Proof-of-Possession Key Semantics for CBOR Web Tokens (CWTs) specification has been updated to address issues identified by Roman Danyliw while writing his shepherd review. Thanks to Samuel Erdtman for fixing an incorrect example.
The OpenID Connect Federation 1.0 specification is being developed to enable large-scale federations to be deployed using OpenID Connect. It enables trust among federation participants to be established through signed statements made by federation operators about federation participants.
The design of this specification builds upon the experiences gained in operating large-scale SAML 2.0 federations, and indeed, is authored by people having practical experience with these federations. The primary authors are Roland Hedberg and Andreas Åkre Solberg, with additional contributions by Samuel Gulliksson, John Bradley, and myself, as well as members of the OpenID Connect working group, which is the home of the specification.
A key innovation that differentiates OpenID Connect federations from most SAML 2.0 federations is that OpenID Connect federation employs heirarchal metadata, where participants directly publish statements about themselves, versus the aggregated metadata approach used by many SAML 2.0 federations, where Continue reading "OpenID Connect Federation Specification"
Key ID confirmation method considerations suggested by Jim Schaad have been added to the Proof-of-Possession Key Semantics for CBOR Web Tokens (CWTs) specification. Per discussions in the working group meeting in Bangkok, it’s now time for the shepherd review.
The JSON Web Token (JWT) Best Current Practices (BCP) specification has been updated to address the review comments from Security Area Director (AD) Eric Rescorla. Thanks to Eric for the review and to Yaron Sheffer for working on the responses with me.
Note that IETF publication has already been requested. The next step is for the shepherd review to be submitted and responded to.
The Proof-of-Possession Key Semantics for CBOR Web Tokens (CWTs) specification has been updated to addresses a few additional Working Group Last Call (WGLC) comments. All of the (few) changes were about improving the clarity of the exposition. I believe that this completes addressing the WGLC comments.
Thanks to Roman Danyliw for helping to categorize the remaining comments that needed to be addressed.
Now that the Security Event Token (SET) specification is RFC 8417, the SecEvent working group is working on defining the SET delivery mechanisms. This week, both the push-based and poll-based SET delivery specs have been updated to simplify their exposition and reduce duplication of text between the drafts. Thanks to Annabelle Backman for doing the bulk of the recent work on the push-based delivery spec. The latest versions of both specs contain these updates:
Addressed problems identified in my 18-Jul-18 review message titled “Issues for both the Push and Poll Specs”.
Changes to align terminology with RFC 8417, for instance, by using the already defined term SET Recipient rather than SET Receiver.
Applied editorial and minor normative corrections.
Updated Marius Scurtescu’s contact information.
In addition, the latest version of the poll delivery spec also contains this update:
As Alex Simons recently wrote, it’s time for token binding. Especially now that the core specs are done, now’s the time for platforms and applications to deploy Token Binding. This will enable replacing bearer tokens, which can be stolen and reused, with Token Bound tokens, which are useless if stolen. This is a huge security benefit applicable to any tokens used over TLS, including browser cookies, OAuth access tokens and refresh tokens, and OpenID Connect ID Tokens.
This draft contains a few refinements since the first candidate recommendation but no substantial changes. The new CR was needed to fulfill the W3C’s IPR protection requirements. The few changes were based, in part, upon things learned during multiple interop events for WebAuthn implementations. The working group plans to base coming the Proposed Recommendation on this draft.
The three core IETF Token Binding Specifications have been sent to the RFC Editor, which means that their normative content will no longer change. It’s time to move implementations to version 1.0! The abstract of the Token Binding over HTTP specification describes Token Binding as:
This document describes a collection of mechanisms that allow HTTP servers to cryptographically bind security tokens (such as cookies and OAuth tokens) to TLS connections.
We describe both first-party and federated scenarios. In a first-party scenario, an HTTP server is able to cryptographically bind the security tokens it issues to a client, and which the client subsequently returns to the server, to the TLS connection between the client and server. Such bound security tokens are protected from misuse since the server can generally detect if they are replayed inappropriately, e.g., over other TLS connections.