linux-kernel - Re: [PATCH 1/3] X.509: Fix certificate gathering again

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Date:	Thu, 28 May 2015 11:05:32 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Michal Marek <mmarek@...e.cz>, torvalds@...ux-foundation.org,
	aricart@...nix.com, linux-kernel@...r.kernel.org,
	sedat.dilek@...il.com, keyrings@...ux-nfs.org,
	rusty@...tcorp.com.au, linux-security-module@...r.kernel.org,
	james.l.morris@...cle.com
Subject: Re: [PATCH 1/3] X.509: Fix certificate gathering again

On Thu, 2015-05-28 at 10:58 +0100, David Howells wrote:
> David Woodhouse <dwmw2@...radead.org> wrote:
> 
> > > The only issue is that the makefile expressions are a bit hairy. For
> > > starters, we already have definitions for $(quote) and $(space) in
> > > kbuild. I'll have a closer look at the config_filename macro and try to
> > > simplify it somehow. But it's just cosmetics, the patch can be merged as
> > > is for now.
> > 
> > I've actually changed my mind about the 'awk | base64 -d' bit. The error
> > handling is too poor. I'd like to do that in C with a variant of the
> > existing extract_cert tool, and make sure we have proper X.509
> > certificates and error handling/reporting.
> 
> You could also do it in perl pretty easily.

It's a fairly trivial change to scripts/extract-cert.c though, which
gives you validation of the cert ASN.1 instead of just base64-decoding
and importing arbitrary crap as long as it's found between
 -----BEGIN CERTIFICATE-----
and
 -----END CERTIFICATE-----

Yeah, we could do the X.509 parsing/validation in perl too. But let's
not.

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

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