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From: David Howells <dhowells@redhat.com>
In-Reply-To: <20150521213829.GH23057@wotan.suse.de>
References: <20150521213829.GH23057@wotan.suse.de> <20150515123513.16723.96340.stgit@warthog.procyon.org.uk> <555BD715.40202@kernel.org> <31772.1432128969@warthog.procyon.org.uk> <CALCETrUt+OO8sk=7j+rBToHujV7ONDzQ1Z6UMJ9HHUB44Jmtpw@mail.gmail.com> <20150520162059.GC10473@localhost>
To: "Luis R. Rodriguez" <mcgrof@suse.com>
Cc: dhowells@redhat.com, Andy Lutomirski <luto@amacapital.net>,
        Andy Lutomirski <luto@kernel.org>,
        Rusty Russell <rusty@rustcorp.com.au>, Michal Marek <mmarek@suse.cz>,
        Matthew Garrett <mjg59@srcf.ucam.org>, keyrings@linux-nfs.org,
        Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Seth Forshee <seth.forshee@canonical.com>,
        LSM List <linux-security-module@vger.kernel.org>,
        David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH 0/8] MODSIGN: Use PKCS#7 for module signatures [ver #4]
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Date: Fri, 22 May 2015 08:48:56 +0100
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Luis R. Rodriguez <mcgrof@suse.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