linux-kernel - Re: Kdump with signed images

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Date:	Thu, 25 Oct 2012 14:40:21 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Khalid Aziz <khalid@...ehiking.org>, kexec@...ts.infradead.org,
	horms@...ge.net.au, Dave Young <dyoung@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Matthew Garrett <mjg@...hat.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	Roberto Sassu <roberto.sassu@...ito.it>,
	Kees Cook <keescook@...omium.org>
Subject: Re: Kdump with signed images

On Thu, 2012-10-25 at 10:10 -0400, Vivek Goyal wrote:
> On Thu, Oct 25, 2012 at 02:10:01AM -0400, Mimi Zohar wrote:
> 
> [..]
> > IMA-appraisal verifies the integrity of file data, while EVM verifies
> > the integrity of the file metadata, such as LSM and IMA-appraisal
> > labels.  Both 'security.ima' and 'security.evm' can contain digital
> > signatures.
> 
> But the private key for creating these digital signature needs to be
> on the target system?
> 
> Thanks
> Vivek

Absolutely not.  The public key needs to be added to the _ima or _evm
keyrings.  Roberto Sassu modified dracut and later made equivalent
changes to systemd.  Both have been upstreamed.  Dmitry has a package
that labels the filesystem called ima-evm-utils, which supports hash
(IMA), hmac(EVM) and digital signatures(both).

We're hoping that distro's would label all immutable files, not only elf
executables, with digital signatures and mutable files with a hash.

thanks,

Mimi

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