From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 495F1C4707A for ; Fri, 21 May 2021 16:12:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C2DE613DB for ; Fri, 21 May 2021 16:12:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237287AbhEUQNg (ORCPT ); Fri, 21 May 2021 12:13:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236522AbhEUQNg (ORCPT ); Fri, 21 May 2021 12:13:36 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A1A1C061574; Fri, 21 May 2021 09:12:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ToZBGzS2YFETVjmm5DOtVlcZeEd4rf0HXV4h0PYkucQ=; b=M1rhvATx+KaX6g1bnIlSiV2YVf xzYMnlqXcdvLE5TAXiVRRxslfe+R81GcoHlHTIElXCkmyQ76plSm7o9Sjxy9naqgAdoFSTkwH4NH7 oxQeqeGE+AM4MCnhnumFH8QrOCqp+7XjQ8VyTk2+db/8sXzQ2sDUMDngLTk/OJyI8zUR0amcQS8pT BYHLR7nIIweXpAIUF9GQocqvNu2hOc2GT1QYd74r1ul95BJHUNrz72HnW+VEt1mRGtGGpaZkYQHYi ZvHrM16wRm53eGGd+NvZZrGhdhSPGK+sEbQNj1p1hEsBUNCk9zwADu4nC0rMFwYQKQLaRtRsgHwFO WG/g4swQ==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lk7ky-00HGd5-KW; Fri, 21 May 2021 16:12:12 +0000 Message-ID: Subject: Re: [PATCH 0/4] Trusted Key policy for TPM 2.0 From: David Woodhouse To: James Bottomley , linux-integrity@vger.kernel.org Cc: Mimi Zohar , Jarkko Sakkinen , keyrings@vger.kernel.org, David Howells Date: Fri, 21 May 2021 17:12:09 +0100 In-Reply-To: <25e874bfd1d33ebd2dc774b9ab2d47285a2f4d07.camel@HansenPartnership.com> References: <20210521004401.4167-1-James.Bottomley@HansenPartnership.com> <49bf69d011373f339a21bb61183b135babb6edc8.camel@infradead.org> <57728f2272f26b8ca9e58a8fdac112ec0440e9f6.camel@HansenPartnership.com> <646c272b64912d9d5c9c3c7fdc304ad01772365c.camel@infradead.org> <25e874bfd1d33ebd2dc774b9ab2d47285a2f4d07.camel@HansenPartnership.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-LsOxhSbBq1QsExRKasHM" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: keyrings@vger.kernel.org --=-LsOxhSbBq1QsExRKasHM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-05-21 at 08:55 -0700, James Bottomley wrote: > On Fri, 2021-05-21 at 16:22 +0100, David Woodhouse wrote: > > On Fri, 2021-05-21 at 07:28 -0700, James Bottomley wrote: > > > On Fri, 2021-05-21 at 14:48 +0100, David Woodhouse wrote: > > > > On Thu, 2021-05-20 at 17:43 -0700, James Bottomley wrote: > > > > > Now that the ASN.1 representation of trusted keys is upstream > > > > > we can add policy to the keys as a sequence of policy > > > > > statements meaning the kernel can now construct and use the > > > > > policy session rather than the user having to do it and pass > > > > > the session down to the kernel. This makes TPM 2.0 keys with > > > > > policy much easier. > > > > >=20 > > > > > The format of the policy statements is compatible with the > > > > > openssl_tpm2_engine policy implementation: > > > > >=20 > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/jejb/openssl_tpm2= _engine.git/ > > > > >=20 > > > > > And the seal_tpm2_data command in the above can be used to > > > > > create sealed keys (including with policy statements) for the > > > > > kernel. > > > >=20 > > > > I'd love to see that format properly defined and documented > > > > instead of just a reference to another implementation. > > >=20 > > > Well if you want to help me write an RFC, I can try to submit it. > >=20 > > The xml2rfc tool makes it fairly easy. >=20 > XML and easy ... there's two words you don't often see in a sentence > ... >=20 > > See https://github.com/dwmw2/ietf-cert-best-practice for a template; > > in Appendix B there is an example of specifying an ASN.1 format. >=20 > OK, I'll add it to=20 >=20 > https://git.kernel.org/pub/scm/linux/kernel/git/jejb/openssl_tpm2_engine.= git/ >=20 > But I'll be expecting patches ... Absolutely :) > > We should probably define not just the ASN.1 format but also a URI > > scheme for referencing objects in NVRAM. A TPMv2 version of=20 > > https://datatracker.ietf.org/doc/html/draft-mavrogiannopoulos-tpmuri-01 > > might be a good idea. >=20 > I'm not so sure ... the keys are files not tokens and the pkcs11 URI > doesn't have a file pointer. I suspect the correct way to represent > them would be to fully represent the key in the URI, which sounds like > a length explosion. Not files, and definitely nothing to do with PKCS#11. I meant a URI for referring to keys which are in NVRAM. The kind you currently use the '//nvkey:' prefix for. We should standardise that form, as a URI, so that users can take that same URI to *any* application and expect it to work. 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