linux-kernel - Re: [PATCH 10/8] modsign: Allow password to be specified for signing key

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Message-ID: <1432065873.3277.84.camel@infradead.org>
Date:	Tue, 19 May 2015 21:04:33 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	David Howells <dhowells@...hat.com>, rusty@...tcorp.com.au,
	mmarek@...e.cz, mjg59@...f.ucam.org, keyrings@...ux-nfs.org,
	dmitry.kasatkin@...il.com, mcgrof@...e.com,
	linux-kernel@...r.kernel.org, seth.forshee@...onical.com,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 10/8] modsign: Allow password to be specified for
 signing key

On Tue, 2015-05-19 at 15:14 -0400, Mimi Zohar wrote:
> On Tue, 2015-05-19 at 19:48 +0100, David Howells wrote:
> > Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> > 
> > > Definitely better.  (FYI, Dmitry's modsig patches from 2012 used the
> > > keyring for safely storing a password. )
> 
> Without the environment variable set, there's a pop up prompt to enter
> the pin.  A pain to have to enter for each and every kernel module, but
> definitely a nice option.

Right. In fact now that sign-file is written in C and not having to call
out to /usr/bin/openssl for each signature, we *could* authenticate to
the PKCS#11 token (or load the private key from the file) just once and
sign all the modules in a *single* invocation.

So you'd only be asked for the password *once*.

The make rules to achieve that are somewhat non-trivial, but it was an
idea we had in our minds when we settled on doing it in C rather than
scripting it.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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