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Re: [OAUTH-WG] client certs and TLS Terminating Reverse Proxies (was Re: I-D Action: draft-ietf-oauth-jwt-introspection-response-08.txt)

"Salz, Rich" <rsalz@akamai.com> Mon, 28 October 2019 18:55 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Rifaat Shekh-Yusef <rifaat.ietf@gmail.com>
CC: Neil Madden <neil.madden@forgerock.com>, Brian Campbell <bcampbell=40pingidentity.com@dmarc.ietf.org>, oauth <oauth@ietf.org>
Thread-Topic: [OAUTH-WG] client certs and TLS Terminating Reverse Proxies (was Re: I-D Action: draft-ietf-oauth-jwt-introspection-response-08.txt)
Thread-Index: AQHVi20DwSDixrsmwUqaChyBzydqk6dtvDgAgAKKHACAACgPAIAAB5+AgAAQz4D//8FmgIAAZUaA//++JYA=
Date: Mon, 28 Oct 2019 18:55:19 +0000
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References: <85D42AA1-FF57-4383-BACB-57C5AA32CFAC@lodderstedt.net> <CAEKOcs2gkM3Henz5nS04_EuBQXWWbJU5K02ErP0rnVZXmjxXJQ@mail.gmail.com> <20191021020546.GZ43312@kduck.mit.edu> <CA+k3eCS7pf3wXBkpbXE0AXKUGogo0YcHd8oWfiBfkPB5axGQQw@mail.gmail.com> <8A8B8892-9D16-4210-BC13-47B5D7859976@mit.edu> <20191024170326.GO69013@kduck.mit.edu> <CAGL6epJZtTXKSGFj0BfhF3kd_Z-z2xzOWXOPEKXc5m18Z4L1uA@mail.gmail.com> <CA+k3eCS8VuCfy4XeqYmLuuLK=rLvHsonSZj4i9O11U-mcua9Pg@mail.gmail.com> <CAGL6epKTV5hXqm2-qgUyG-iA90eLu49GjOKeyLcfsn2naTSV5w@mail.gmail.com> <CA+k3eCQ87n4m--nBc+PX7qE727fqA6vM=meEJZxwfnbpJ2dOsw@mail.gmail.com> <CAGL6epJQbVDrAKB+zNAPuaG0+uLxF3HijEE6=vgYaeXxB_2PXQ@mail.gmail.com> <CA+k3eCQbku0V6z2wCM084FW342dY6=_H7mEv6U3sHCDgefkxXA@mail.gmail.com> <E03CD445-39E8-4262-97BE-E0EE11231A63@forgerock.com> <BE6B1D4A-26CB-42B0-89F9-88588E47E773@akamai.com> <CAGL6epKaFkOw=GaMxjSK90KxRmMsxrHe3og5704-2Ykq-aM5cg@mail.gmail.com>
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Subject: Re: [OAUTH-WG] client certs and TLS Terminating Reverse Proxies (was Re: I-D Action: draft-ietf-oauth-jwt-introspection-response-08.txt)
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  *   To avoid the misconfiguration issue Neil raised, you probably need both: a client-cert and a signature over the certificate being forwarded,

I am not so sure.  One can argue that transport-level identity should be secured by transport-level.  But installing a client certificate on a reverse proxy can be difficult.  (Not if the reverse proxy is a CDN, of course :) And I don’t see how having both prevents misconfiguration, but that might be my fault.


  *   This could still be achieve by extending RFC7239 with new parameter(s).

I have no opinion on this part of it.

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