Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752657AbbERQzo (ORCPT ); Mon, 18 May 2015 12:55:44 -0400 Received: from casper.infradead.org ([85.118.1.10]:47007 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751177AbbERQzl (ORCPT ); Mon, 18 May 2015 12:55:41 -0400 Message-ID: <1431968136.29806.69.camel@infradead.org> Subject: Re: Should we automatically generate a module signing key at all? From: David Woodhouse To: Linus Torvalds Cc: David Howells , Michal Marek , Abelardo Ricart III , Linux Kernel Mailing List , Sedat Dilek , keyrings@linux-nfs.org, Rusty Russell , LSM List Date: Mon, 18 May 2015 17:55:36 +0100 In-Reply-To: References: <31154.1431965087@warthog.procyon.org.uk> <1431965955.29806.53.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-29/R6RyJpWJFWjdTPJNZ" X-Mailer: Evolution 3.16.2.1 (3.16.2.1-1.fc22) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9855 Lines: 155 --=-29/R6RyJpWJFWjdTPJNZ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2015-05-18 at 09:22 -0700, Linus Torvalds wrote: > On Mon, May 18, 2015 at 9:19 AM, David Woodhouse > wrote: > > > > I prefer the other solution I suggested a few minutes ago =E2=80=94 let > > signing_key.{priv,x509} be autogenerated, and if the user wants to > > provide their own then let them call it something else. >=20 > Absolutely. And external keys probably shouldn't be in the build tree > at all, they should be a pointer to outside the build tree (ie "I=20 > have my magic kernel key on the USB key that I mount at xyz"). I basically have that already working at=20 http://git.infradead.org/users/dwmw2/modsign-pkcs11-c.git For an external key, I think I'm happy to insist that *both* cert and key be present at $CONFIG_MODULE_SIG_KEY =E2=80=94 it's either a PEM file w= ith both, or a PKCS#11 URI which identifies both. There doesn't seem to be much point in allowing them to be in separate files. I'm tempted to convert the autogenerated keys to do the same, so we *always* extract signing_key.x509 from the 'key' file. But then again, it (counter-intuitively) makes the dependencies non-trivial so I probably won't. I am moderately unhappy with the fact that CONFIG_MODULE_SIG_KEY being equal to its default of 'signing_key.priv' is a special case meaning 'in-tree, autogenerated'. My first incarnation had an explicit boolean variable for 'use an external key' but... randconfig would have broken. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-29/R6RyJpWJFWjdTPJNZ Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 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