From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 1931D323 for ; Tue, 28 Jul 2015 14:23:43 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 58B3A138 for ; Tue, 28 Jul 2015 14:23:42 +0000 (UTC) Message-ID: <1438093418.26913.174.camel@infradead.org> From: David Woodhouse To: David Howells , ksummit-discuss@lists.linuxfoundation.org Date: Tue, 28 Jul 2015 15:23:38 +0100 In-Reply-To: <20436.1438090619@warthog.procyon.org.uk> References: <20436.1438090619@warthog.procyon.org.uk> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-SbI4nhVOylYeUsWB3e1y" Mime-Version: 1.0 Cc: mcgrof@gmail.com, jkkm@jkkm.org Subject: Re: [Ksummit-discuss] [TECH TOPIC] Firmware signing List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-SbI4nhVOylYeUsWB3e1y Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2015-07-28 at 14:36 +0100, David Howells wrote: >=20 > (1) Should signatures produced by the manager of the linux-firmware pack= age > be allowed only? >=20 > (2) If the linux-firmware packages are signed by a single key (or just a= few > keys) it may be manageable to compile all these keys into the kernel= . I really think we want to allow firmware to be signed by the vendor who created it =E2=80=94 and we want the linux-firmware.git repository to carry= the original vendors' signatures along with the firmware blobs. Having a signature generated by the linux-firmware packager which just certifies that this *is* the blob that was in the linux-firmware.git repository is only a partial solution. I think we probably want to extend the request_firmware() call to optionally take an additional certificate identifier (or hash), and require the firmware to be signed with *that* certificate. Rather than building the full cert into the kernel, perhaps we'd only put the *hash* into the kernel, and require the PKCS#7 signature to *include* the signing cert. So, for example, the iwlwifi driver could provide a hash of Intel's firmware-signing cert. And the firmware would come with a detached PKCS#7 signature *containing* that signing cert, for validation to succeed. In the case where the kernel has been built to require signed firmware and a driver *doesn't* specify the acceptable signing cert, *then* a system-wide trusted certificate should be accepted. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-SbI4nhVOylYeUsWB3e1y 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 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