linux-kernel - Re: [GIT PULL] Load keys from signed PE binaries

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Date:	Thu, 21 Feb 2013 18:17:33 +0000
From:	David Howells <dhowells@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	dhowells@...hat.com, Matthew Garrett <mjg59@...f.ucam.org>,
	Josh Boyer <jwboyer@...hat.com>,
	Peter Jones <pjones@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Kees Cook <keescook@...omium.org>, keyrings@...ux-nfs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Load keys from signed PE binaries

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > There's only one signing authority, and they only sign PE binaries.
> 
> If Red Hat wants to deep-throat Microsoft, that's *your* issue.  That
> has nothing what-so-ever to do with the kernel I maintain. It's
> trivial for you guys to have a signing machine that parses the PE
> binary, verifies the signatures, and signs the resulting keys with
> your own key. You already wrote the code, for chissake, it's in that
> f*cking pull request.

There's a problem with your idea.

 (1) Microsoft's revocation certificates would be based on the hash of the PE
     binary, not the key.

 (2) Re-signing would make the keys then dependent on our master key rather
     than directly on Microsoft's.  Microsoft's revocation certificates[*]
     would then be useless.

 (3) The only way Microsoft could then revoke the extra keys would be to
     revoke our *master* key.

[*] Assuming of course we add support for these.

David
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