linux-kernel - Re: [PATCH 0/8] MODSIGN: Use PKCS#7 for module signatures [ver #4]

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Message-ID: <32540.1432280936@warthog.procyon.org.uk>
Date:	Fri, 22 May 2015 08:48:56 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	dhowells@...hat.com, Andy Lutomirski <luto@...capital.net>,
	Andy Lutomirski <luto@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Michal Marek <mmarek@...e.cz>,
	Matthew Garrett <mjg59@...f.ucam.org>, keyrings@...ux-nfs.org,
	Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Seth Forshee <seth.forshee@...onical.com>,
	LSM List <linux-security-module@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 0/8] MODSIGN: Use PKCS#7 for module signatures [ver #4]

Luis R. Rodriguez <mcgrof@...e.com> wrote:

> > This is similar to what i am doing right now - create CA hierarchy so we can 
> > have something like:
> > 
> >                                +-> KeyB
> >                                |
> > RootCA --->  CertA ---> CertB ---> CertC ---> KeyC
> >                     |
> >                     +-> CertA' ---> KeyA"
> 
> How exactly do you go about uploading CertB to the kernel BTW?

Assuming RootCA or CertA is present in the kernel, the idea would be to use
the add_key() system call or the request_key() mechanism to add the key to the
system keyring.  The key in the cert would only be added to the keyring if it
is trusted by a key already there.

David
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