Yeah, probably. On Sat, Feb 2, 2019 at 12:39 AM Neil Madden <neil.mad...@forgerock.com> wrote:
> If we go down the 307 route, shouldn’t it rather be a 308 (permanent) > redirect? It seems unnecessary for the client to keep trying the original > endpoint or have to remember cache-control/expires timeouts. > > — Neil > > On 2 Feb 2019, at 00:03, Richard Backman, Annabelle < > richanna=40amazon....@dmarc.ietf.org> wrote: > > Confusion from the AS’s perspective: > > 1. If I only support mTLS, do I need to include both > token_endpoint_uri and mtls_endpoints? Should I omit token_endpoint_uri? Or > set it to the empty string? > 2. What if I only support mTLS for the token endpoint, but not > revocation or user info? > 3. How do I specify authentication methods for the mTLS token > endpoint? Does token_endpoint_auth_methods apply to both the mTLS and > non-mTLS endpoints? > 4. I’m using the OAuth 2.0 Device Flow. Do I include a mTLS-enabled > device_authorization_endpoint under mtls_endpoints? > > > > Confusion from the client’s perspective: > > 1. As far as I know, I’m a public client, and don’t know anything > about mTLS, but the IT admins installed client certs in their users’ > browsers and the AS expects to use that to authenticate me. > 2. My AS metadata parser crashed because the mTLS-only AS omitted > token_endpoint_uri. > 3. My AS metadata parser crashed because it didn’t expect to encounter > a JSON object as a parameter value. > 4. The mTLS-only AS didn’t provide a value for mtls_endpoints, what do > I do? > 5. I don’t know what that “m” means, but they told me to use HTTPS, so > I should use the one with “tls” in its name, right? > > > > Yes, you can write normative text that answers most of these. But you’ll > have to clearly cover a lot of similar-but-slightly-different scenarios and > be very explicit. And implementers will still get it wrong. The metadata > change introduces opportunities for confusion and failure that do not exist > now, and forces them on everyone who supports mTLS. In contrast, the 307 > redirect is only required when an AS wants to support both, and is > unambiguous in its behavior and meaning. > > > > -- > > Annabelle Richard Backman > > AWS Identity > > > > > > *From: *Brian Campbell <bcampbell=40pingidentity....@dmarc.ietf.org> > *Date: *Friday, February 1, 2019 at 3:17 PM > *To: *"Richard Backman, Annabelle" <richa...@amazon.com> > *Cc: *George Fletcher <gffle...@aol.com>, oauth <oauth@ietf.org> > *Subject: *[UNVERIFIED SENDER] Re: [OAUTH-WG] MTLS and in-browser clients > using the token endpoint > > > > It doesn't seem like that confusing or large of a change to me - if the > client is doing MTLS and the given endpoint is present in `mtls_endpoints`, > then it uses that one. Otherwise it uses the regular endpoint. It gives an > AS a lot of flexibility in deployment options. I personally think getting a > 307 approach deployed and working would be more complicated and error > prone. > > > > It is a minority use case at the moment but there are forces in play, like > the push for increased security in general and to have javascript clients > use the code flow, that suggest it won't be terribly unusual to see an AS > that wants to support MTLS clients and javascript/spa clients at the same > time. > > > > I've personally wavered back and forth in this thread on whether or not to > add the new metadata (or something like it). With my reasoning each way > kinda explained somewhere back in the 40 or so messages that make up this > thread. But it seems like the rough consensus of the group here is in > favor of it. > > > > > > > > > > On Fri, Feb 1, 2019 at 3:18 PM Richard Backman, Annabelle <richanna= > 40amazon....@dmarc.ietf.org> wrote: > > This strikes me as a very prominent and confusing change to support what > seems to be a minority use case. I’m getting a headache just thinking about > the text needed to clarify when the AS should provide `mtls_endpoints` and > when the client should use that versus using `token_endpoint.` Why is the > 307 status code insufficient to cover the case where a single AS supports > both mTLS and non-mTLS? > > > > -- > > Annabelle Richard Backman > > AWS Identity > > > > > > *From: *OAuth <oauth-boun...@ietf.org> on behalf of Brian Campbell > <bcampbell=40pingidentity....@dmarc.ietf.org> > *Date: *Friday, February 1, 2019 at 1:31 PM > *To: *George Fletcher <gffletch=40aol....@dmarc.ietf.org > <40aol....@dmarc...ietf.org>> > *Cc: *oauth <oauth@ietf.org> > *Subject: *Re: [OAUTH-WG] MTLS and in-browser clients using the token > endpoint > > > > Yes, that would work. > > > > On Fri, Feb 1, 2019 at 2:28 PM George Fletcher <gffletch= > 40aol....@dmarc.ietf..org <40aol....@dmarc.ietf.org>> wrote: > > What if the AS wants to ONLY support MTLS connections. Does it not specify > the optional "mtls_endpoints" and just use the normal metadata values? > > On 1/15/19 8:48 AM, Brian Campbell wrote: > > It would definitely be optional, apologies if that wasn't made clear.. > It'd be something to the effect of optional for the AS to include and > clients doing MTLS would use it when present in AS metadata. > > > > On Tue, Jan 15, 2019 at 2:04 AM Dave Tonge <dave.to...@momentumft.co.uk> > wrote: > > I'm in favour of the `mtls_endpoints` metadata parameter - although it > should be optional. > > > *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. 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