Re: [lamps] Revocation Request Format?
Jacob Hoffman-Andrews <jsha@eff.org> Fri, 02 March 2018 20:26 UTC
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To: Phillip Hallam-Baker <phill@hallambaker.com>, Peter Bowen <pzbowen@gmail.com>
Cc: Ryan Sleevi <ryan-ietf@sleevi.com>, SPASM <SPASM@ietf.org>
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From: Jacob Hoffman-Andrews <jsha@eff.org>
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Date: Fri, 02 Mar 2018 12:26:10 -0800
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Subject: Re: [lamps] Revocation Request Format?
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ACME already specifies how to revoke by proving control of the private key, or by proving control of the affected domains. If a CA wants to provide standards-based revocation services, they don't need to implement all of ACME, just enough to sign up for an account and do the revocation request. On 03/02/2018 12:17 PM, Phillip Hallam-Baker wrote: > If it is a signing key, just sign a CRL for the certificate. Now that > is not quite the same as revoking the key but certs are the only > things PKIX makes status assertions about. > > Do we have to support self-revocation of certs with only encryption > only keys? Probably not. > > Since a very common reason for having to revoke a cert is that the > private key is lost entirely any revocation format cannot be the only > way to request revocation. So I don't see the relevance of the robot > attack. > > > Standards are all about taking choices that don't matter except that a > choice is made. If we choose to recognize CRL suicide notes as the one > mechanism that must be supported, that is one mechanism that can be > added to PKI toolkits that don't already have it. And yes, there is at > least one widely used toolkit that allows certificates and CRLs to be > parsed but not generated. > > > > On Fri, Mar 2, 2018 at 3:03 PM, Peter Bowen <pzbowen@gmail.com > <mailto:pzbowen@gmail.com>> wrote: > > On Fri, Mar 2, 2018 at 8:08 AM, Ryan Sleevi <ryan-ietf@sleevi.com > <mailto: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 > <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 > > > > > _______________________________________________ > Spasm mailing list > Spasm@ietf.org > https://www.ietf.org/mailman/listinfo/spasm
- [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