linux-kernel - Re: [PATCH 2/6] integrity: IMA as an integrity service provider

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Message-ID: <alpine.LRH.1.10.0901301032080.29870@tundra.namei.org>
Date:	Fri, 30 Jan 2009 11:07:03 +1100 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	"<David Safford" <safford@...son.ibm.com>,
	Serge Hallyn <serue@...ibm.com>, Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 2/6] integrity: IMA as an integrity service provider

On Thu, 29 Jan 2009, Mimi Zohar wrote:

> +++ b/security/integrity/ima/Kconfig
> @@ -0,0 +1,49 @@
> +# IBM Integrity Measurement Architecture
> +#
> +config IMA
> +	bool "Integrity Measurement Architecture(IMA)"
> +	depends on ACPI
> +	select SECURITYFS
> +	select CRYPTO
> +	select CRYPTO_HMAC
> +	select CRYPTO_MD5
> +	select CRYPTO_SHA1
> +	select TCG_TPM
> +	select TCG_TIS
> +	help
> +	  The Trusted Computing Group(TCG) runtime Integrity
> +	  Measurement Architecture(IMA) maintains a list of hash
> +	  values of executables and other sensitive system files,
> +	  as they are read or executed. If an attacker manages
> +	  to change the contents of an important system file
> +	  being measured, we can tell.

Out of interest, do you know if the TCG has analyzed their use of SHA-1 
in light of various attacks on the algorithm over the last few years?

The IETF has published analysis and recommendations relating to the use of 
SHA-1 (and other cryptographic hashes) with IP protocols:

http://www.ietf.org/rfc/rfc4894.txt
http://www.ietf.org/rfc/rfc4270.txt

It would be useful to know if similar analysis has been performed for TPM.


- James
-- 
James Morris
<jmorris@...ei.org>
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