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

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Message-ID: <1453318283.2858.27.camel@linux.vnet.ibm.com>
Date:	Wed, 20 Jan 2016 14:31:23 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	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]

On Tue, 2016-01-19 at 11:30 +0000, David Howells wrote:
> Add the following:
> 
>  (1) A new system keyring that is used to store information about
>      blacklisted certificates and signatures.
> 
>  (2) A new key type (called 'blacklist') that is used to store a
>      blacklisted hash in its description as a hex string.  The key accepts
>      no payload.

>  (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?  Update
keys documentation?

> The above are enabled with CONFIG_SYSTEM_BLACKLIST_KEYRING.
> 
> Once the kernel is booted, the blacklist keyring can be listed:
> 
> 	root@...romeda ~]# keyctl show %:.blacklist
> 	Keyring
> 	 723359729 ---lswrv      0     0  keyring: .blacklist
> 	 676257228 ---lswrv      0     0   \_ blacklist: 123412341234c55c1dcc601ab8e172917706aa32fb5eaf826813547fdf02dd46
> 
> 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.

> 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.

Mimi