linux-kernel - Re: sign-file and detached PKCS#7 firmware signatures

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Date:	Tue, 19 May 2015 17:48:57 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	dhowells@...hat.com, rusty@...tcorp.com.au, mmarek@...e.cz,
	mjg59@...f.ucam.org, keyrings@...ux-nfs.org,
	dmitry.kasatkin@...il.com, linux-kernel@...r.kernel.org,
	seth.forshee@...onical.com, linux-security-module@...r.kernel.org,
	dwmw2@...radead.org
Subject: Re: sign-file and detached PKCS#7 firmware signatures

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

> > Something like:
> > 
> > 	openssl smime -verify \
> > 		-in $PKCS7_MESSAGE_FILE_IN_DER_FORM \
> > 		-inform DER \
> > 		-content $FIRMWARE_BLOB_NAME \
> > 		-inkey $PRIVATE_KEY_FILE_IN_PEM_FORM \
> > 		-signer $X509_CERT_FILE_IN_PEM_FORM
> > 
> > I would guess.
> 
> I tried a few things and no luck with that.

Try this:

	openssl smime -verify \
		-in $PKCS7_MESSAGE_FILE_IN_DER_FORM \
		-inform DER \
		-certfile $X509_CERT_FILE_IN_PEM_FORM \
 		-content $FIRMWARE_BLOB_NAME \
		-binary \
		-noverify \
		>/dev/null

Seems using -signer with -verify isn't a good idea as -signer refers to an
output file during verification just for the surprise factor.

David
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