linux-kernel - Re: Linux Firmware Signing

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Message-ID: <20150827193700.GE8051@wotan.suse.de>
Date:	Thu, 27 Aug 2015 21:37:00 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Andy Lutomirski <luto@...capital.net>,
	Kees Cook <keescook@...omium.org>,
	"Roberts, William C" <william.c.roberts@...el.com>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	"james.l.morris@...cle.com" <james.l.morris@...cle.com>,
	"serge@...lyn.com" <serge@...lyn.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	Eric Paris <eparis@...isplace.org>, selinux@...ho.nsa.gov,
	Stephen Smalley <sds@...ho.nsa.gov>,
	"Schaufler, Casey" <casey.schaufler@...el.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Jones <pjones@...hat.com>, Takashi Iwai <tiwai@...e.de>,
	dwmw2@...radead.org, Ming Lei <ming.lei@...onical.com>,
	Joey Lee <jlee@...e.de>,
	Vojtěch Pavlík <vojtech@...e.com>,
	Kyle McMartin <kyle@...nel.org>,
	Seth Forshee <seth.forshee@...onical.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: Linux Firmware Signing

On Thu, Aug 27, 2015 at 11:38:58AM +0100, David Howells wrote:
> Luis R. Rodriguez <mcgrof@...e.com> wrote:
> 
> > "PKCS#7: Add an optional authenticated attribute to hold firmware name"
> > https://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/commit/?h=fwsign-pkcs7&id=1448377a369993f864915743cfb34772e730213good
> > 
> >         1.3.6.1.4.1.2312.16     Linux kernel
> >         1.3.6.1.4.1.2312.16.2   - PKCS#7/CMS SignerInfo attribute types
> >         1.3.6.1.4.1.2312.16.2.1   - firmwareName
> > 
> > I take it you are referring to this?
> 
> Yes.
> 
> > If we follow this model we'd then need something like:
> > 
> >         1.3.6.1.4.1.2312.16.2.2   - seLinuxPolicyName
> > 
> > That should mean each OID that has different file names would need to be
> > explicit about and have a similar entry on the registry. I find that pretty
> > redundant and would like to avoid that if possible.
> 
> firmwareName is easy for people to understand - it's the name the kernel asks
> for and the filename of the blob.  seLinuxPolicyName is, I think, a lot more
> tricky since a lot of people don't use SELinux, and most that do don't
> understand it (most people that use it aren't even really aware of it).
> 
> If you can use the firmwareName as the SELinux/LSM key, I would suggest doing
> so - even if you dress it up as a path (/lib/firmware/<firmwareName>).

It seems we don't have to worry about it now, and perhaps SELinux folks might
go another route.

  Luis
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