I share the concern Brian has, which is also the conclusion I came up with in my other email sent a few minutes ago.
From: OAuth <oauth-boun...@ietf.org> On Behalf Of Brian Campbell Sent: Friday, November 30, 2018 11:43 PM To: Torsten Lodderstedt <tors...@lodderstedt.net> Cc: oauth <oauth@ietf.org> Subject: Re: [OAUTH-WG] draft-parecki-oauth-browser-based-apps-00 On Sat, Nov 17, 2018 at 4:07 AM Torsten Lodderstedt <tors...@lodderstedt.net<mailto:tors...@lodderstedt.net>> wrote: > Am 15.11.2018 um 23:01 schrieb Brock Allen > <brockal...@gmail.com<mailto:brockal...@gmail.com>>: > > So you mean at the resource server ensuring the token was really issued to > the client? Isn't that an inherent limitation of all bearer tokens (modulo > HTTP token binding, which is still some time off)? Sure. That’s why the Security BCP recommends use of TLS-based methods for sender constraining access tokens (https://tools.ietf.org/html/draft-ietf-oauth-security-topics-09#section-2..2). Token Binding for OAuth (https://tools.ietf.org/html/draft-ietf-oauth-token-binding-08<https://tools..ietf.org/html/draft-ietf-oauth-token-binding-08>) as well as Mutual TLS for OAuth (https://tools.ietf.org/html/draft-ietf-oauth-mtls-12) are the options available. Unfortunately even when using the token endpoint, for SPA / in-browser client applications, the potential mechanisms for sender/key-constraining access tokens don't work very well or maybe don't work at all. So I don't know that the recommendation is very realistic. CONFIDENTIALITY NOTICE: This email may contain confidential and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited.. If you have received this communication in error, please notify the sender immediately by e-mail and delete the message and any file attachments from your computer. Thank you. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
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