Re: [OAUTH-WG] [DPoP] Protected resource access and invalid DPoP proofs

2021-08-12 Thread Benjamin Kaduk
On Thu, Aug 12, 2021 at 05:05:03PM -0600, Brian Campbell wrote: > Indeed but this case would be only distinguishing between which of the two > things (token & proof) the client sent was invalid. It seems like a > reasonable amount of information to disclose that might be helpful in > troubleshootin

Re: [OAUTH-WG] [DPoP] Protected resource access and invalid DPoP proofs

2021-08-12 Thread Brian Campbell
Indeed but this case would be only distinguishing between which of the two things (token & proof) the client sent was invalid. It seems like a reasonable amount of information to disclose that might be helpful in troubleshooting while not giving actionable info to would-be attackers. On Thu, Aug 1

Re: [OAUTH-WG] [DPoP] Protected resource access and invalid DPoP proofs

2021-08-12 Thread Benjamin Kaduk
It's not immediately obvious to me that making the distinction is good (but I'm also basically devoid of the context in which this exchange will occur). With security protocols there can be risks from overly descriptive errors, which might (e.g.) leak information that "this is a valid token" vs "t

Re: [OAUTH-WG] [DPoP] Protected resource access and invalid DPoP proofs

2021-08-12 Thread Benjamin Kaduk
On Thu, Aug 12, 2021 at 02:17:24PM -0600, Brian Campbell wrote: > It might be worth a mention but I'm always a little hesitant about > potentially repeating content from other specs (and maybe even getting it > wrong!). Maybe a very brief mention along with a pointer to that section in > RFC 7235 w

Re: [OAUTH-WG] [DPoP] Protected resource access and invalid DPoP proofs

2021-08-12 Thread Brian Campbell
It might be worth a mention but I'm always a little hesitant about potentially repeating content from other specs (and maybe even getting it wrong!). Maybe a very brief mention along with a pointer to that section in RFC 7235 would be appropriate? I'm curious what other WG folk think about this tho