linux-kernel - Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2]

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Date:	Wed, 03 Feb 2016 15:27:52 +0000
From:	David Howells <dhowells@...hat.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	keyrings@...r.kernel.org, petkan@...-labs.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2]

Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:

> >  (3) The ability to configure a list of blacklisted hashes into the kernel
> >      at build time.  This is done by setting
> >      CONFIG_SYSTEM_BLACKLIST_HASH_LIST to the filename of a list of hashes
> >      that are in the form:
> > 
> > 	"<hash>", "<hash>", ..., "<hash>"
> > 
> >      where each <hash> is a hex string representation of the hash and must
> >      include all necessary leading zeros to pad the hash to the right size.
> 
> Is the output of "keyctl print" the hex string representation?

No, there is no payload and no read method.  "keyctl desc" will return the hex
string representation.

>  Update keys documentation?

Not a bad idea, but it should probably go in a separate document, along with
info about asymmetric keys.

> > The blacklist cannot currently be modified by userspace, but it will be
> > possible to load it, for example, from the UEFI blacklist database.
> 
> When loading the UEFI blacklist database is enabled, it should be
> configurable.

Probably.  That patch isn't added yet though.

> > In the future, it should also be made possible to load blacklisted
> > asymmetric keys in here too.
> 
> Please update to reflect patch 3/20 "X.509: Allow X.509 certs to be
> blacklisted" adds this support.

Changed to:

	A later commit will make it possible to load blacklisted asymmetric
	keys in here too.
 
David