linux-kernel - Re: [PATCH 3/4] module: search the key only by keyid

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Message-ID: <13201.1412343605@warthog.procyon.org.uk>
Date:	Fri, 03 Oct 2014 14:40:05 +0100
From:	David Howells <dhowells@...hat.com>
To:	Dmitry Kasatkin <d.kasatkin@...sung.com>
Cc:	dhowells@...hat.com, zohar@...ux.vnet.ibm.com,
	linux-ima-devel@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	rusty@...tcorp.com.au, keyrings@...ux-nfs.org,
	linux-kernel@...r.kernel.org, dmitry.kasatkin@...il.com
Subject: Re: [PATCH 3/4] module: search the key only by keyid

Dmitry Kasatkin <d.kasatkin@...sung.com> wrote:

> BTW. But actually why signer is needed to find the key?
> Every key has unique fingerprint.

The SKID is by no means guaranteed unique, is not mandatory and has no defined
algorithm for generating it.

> Or you say that different certificates might have the same PK?
> What I would consider strange. But anyway, if PK is the same, then
> verification succeed.

Do note: We *do* need to get away from using SKIDs.  We have situations where
we have to use a key that doesn't have one.

David
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