Re: [Iot-onboarding] what can pinned-domain-cert actually pin?
Michael Richardson <mcr+ietf@sandelman.ca> Tue, 27 August 2019 19:21 UTC
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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Kent Watsen <kent+ietf@watsen.net>
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Date: Tue, 27 Aug 2019 15:21:45 -0400
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Subject: Re: [Iot-onboarding] what can pinned-domain-cert actually pin?
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Kent Watsen <kent+ietf@watsen.net> wrote: > The "private CA roll-over" scenario you mention is side-stepped by > enabling the Owner Certificate to itself be a partial chain (i.e., > total-chain = partial-root-chain + partial-owner-cert-chain), hence the > partial-root-chain part can be protected by some offline HSM while > signing (e.g., annually) some middle-level CAs that are used to sign > the actual Owner Cert EE cert. i.e. adding a layer of indirection solves the problem in the classic way. > Separately in SZTP, there is the notion the device dynamically (during > bootstrap) receiving the TA for a bootstrap server it it being > redirected to. In this case, the bootstrap servers are presenting a > TLS-based service (specifically, HTTPS), and so EE certs MAY have a > public root TA. It was discussed at one point that the TA cert may > expire and thus wouldn't it be better to enable the TA to be expressed > as a 2-tuple [ <long-lived TA cert (MAY be a public CA)>, <name of some > 'subject' matter in the TA-issued CA cert>]. But this became > complicated and, instead, we opted for introducing alerts/alarms for > when certificates are nearing expiration. When certificates, or when vouchers? > Part of what made it complicated is that one can imagine an > organization obtaining a single top-level organization-wide commercial > CA certificate that it uses for a variety of reasons, only one of which > is to sign vouchers. These organization-wide commerical CA certificates seem impossible to obtain today. At least, I haven't found a CA willing to sell that anymore, and I would love to be told I'm wrong. > Thus, in such cases, the 2-tuple becomes a > 3-tuple (and perhaps even an N-tuple), e.g.: [ <long-lived TA cert (MAY > be a public CA)>, <name of some 'subject' matter in the TA-issued CA > cert>, <name of some 'subject' matter in the voucher-issuer's cert>]. > Related, though not exactly, I regret that RFC 8366 states that the > pinned-domain-cert value is a single X.509 cert, as opposed to a > potential chain of certs. One reason is so as to simplify support for > path-validations, as not all libraries support partial-chain > validation. A revision could change it from single item to an array of items. That would be relatively easy to figure out in code, but I'm not entirely sure I understand the use case. Are these independant anchors, or are the intended to be related. -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | IoT architect [ ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [
- [Iot-onboarding] what can pinned-domain-cert actu… Michael Richardson
- Re: [Iot-onboarding] what can pinned-domain-cert … Kent Watsen
- Re: [Iot-onboarding] what can pinned-domain-cert … Michael Richardson
- Re: [Iot-onboarding] what can pinned-domain-cert … Kent Watsen
- Re: [Iot-onboarding] what can pinned-domain-cert … Michael Richardson
- Re: [Iot-onboarding] what can pinned-domain-cert … Eliot Lear
- Re: [Iot-onboarding] what can pinned-domain-cert … Owen Friel (ofriel)
- Re: [Iot-onboarding] what can pinned-domain-cert … Eliot Lear
- Re: [Iot-onboarding] what can pinned-domain-cert … Owen Friel (ofriel)
- Re: [Iot-onboarding] what can pinned-domain-cert … Michael Richardson
- Re: [Iot-onboarding] what can pinned-domain-cert … Owen Friel (ofriel)
- Re: [Iot-onboarding] what can pinned-domain-cert … Michael Richardson
- Re: [Iot-onboarding] what can pinned-domain-cert … Owen Friel (ofriel)
- Re: [Iot-onboarding] what can pinned-domain-cert … Michael Richardson
- Re: [Iot-onboarding] what can pinned-domain-cert … Owen Friel (ofriel)
- Re: [Iot-onboarding] what can pinned-domain-cert … Michael Richardson