Re: [lamps] Revocation Request Format?
Peter Bowen <pzbowen@gmail.com> Fri, 02 March 2018 20:03 UTC
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From: Peter Bowen <pzbowen@gmail.com>
Date: Fri, 02 Mar 2018 12:03:29 -0800
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To: Ryan Sleevi <ryan-ietf@sleevi.com>
Cc: Phillip Hallam-Baker <phill@hallambaker.com>, SPASM <SPASM@ietf.org>
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Subject: Re: [lamps] Revocation Request Format?
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On Fri, Mar 2, 2018 at 8:08 AM, Ryan Sleevi <ryan-ietf@sleevi.com> wrote: > It seems signing a new CSR has been a common practice as proof of > possession. > > There's one segment of users that want to have a time-constrained request > (that is, incorporating a challenge/response), while another would prefer > that you can generate the 'request to revoke' at the same time you request > the cert, so that you can use this token for situations such as loss of > private key (but not loss of revocation token) > > It doesn't seem like there needs to be a bespoke format here, considering > that the industry is still working through its use cases, and any signed > data is sufficient. > > Further, it may do harm to try and standardize that. Consider the ROBOT > attack ( https://robotattack.org/ ), which presented a signing oracle with > TLS private keys. Prematurely constraining revocation requests to a > particular format might otherwise preclude reasonable demonstration of > private key compromise. > > So I don't think there's anything for LAMPS to do here - we have ample > available technology (running code that already works) and we have not yet > ascertained industry needs in any meaningful way (no rough consensus for > something new) There is also a documented (albeit not in RFCs) format for a generic signed public key with challenge: https://www.w3.org/TR/html51/sec-forms.html#the-keygen-element PublicKeyAndChallenge ::= SEQUENCE { spki SubjectPublicKeyInfo, challenge IA5STRING } SignedPublicKeyAndChallenge ::= SEQUENCE { publicKeyAndChallenge PublicKeyAndChallenge, signatureAlgorithm AlgorithmIdentifier, signature BIT STRING } The challenge is an arbitrary length IA5STRING, so it could easily include nonce or other challenge data to prove key control. Thanks, Peter
- [lamps] Revocation Request Format? Phillip Hallam-Baker
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Peter Bowen
- Re: [lamps] Revocation Request Format? Phillip Hallam-Baker
- Re: [lamps] Revocation Request Format? Jacob Hoffman-Andrews
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Stephen Farrell
- Re: [lamps] Revocation Request Format? Phillip Hallam-Baker
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Tim Hollebeek
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Tim Hollebeek
- Re: [lamps] Revocation Request Format? Tim Hollebeek
- Re: [lamps] Revocation Request Format? Stephen Farrell
- Re: [lamps] Revocation Request Format? Phillip Hallam-Baker
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Phillip Hallam-Baker
- Re: [lamps] Revocation Request Format? Tim Hollebeek
- Re: [lamps] Revocation Request Format? Stephen Farrell
- Re: [lamps] Revocation Request Format? Tim Hollebeek
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Russ Housley
- Re: [lamps] Revocation Request Format? Russ Housley
- Re: [lamps] Revocation Request Format? Ryan Sleevi
- Re: [lamps] Revocation Request Format? Russ Housley
- Re: [lamps] Revocation Request Format? Stephen Farrell
- Re: [lamps] Revocation Request Format? Dr. Pala