From: Mimi Zohar <zohar@linux.vnet.ibm.com>
To: Matthew Garrett <mjg59@google.com>
Cc: linux-integrity@vger.kernel.org
Subject: Re: [PATCH 1/6] IMA: Allow EVM validation on appraisal even without a symmetric key
Date: Mon, 02 Oct 2017 15:41:50 -0400 [thread overview]
Message-ID: <1506973310.5691.292.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <CACdnJuvzMKWNRSZy2LZUBv+qiPPDkm2ftNZ7RcdqbHXFP49bFg@mail.gmail.com>
On Mon, 2017-10-02 at 10:02 -0700, Matthew Garrett wrote:
> On Sat, Sep 30, 2017 at 7:08 PM, Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
> > On Wed, 2017-09-27 at 15:16 -0700, Matthew Garrett wrote:
> >> A reasonable configuration is to use IMA to appraise a subset of files
> >> (based on user, security label or other features supported by IMA) but
> >> to also want to use EVM to validate not only the state of the IMA hash
> >> but also additional metadata on the file. Right now this is only
> >> possible if a symmetric key has been loaded, which may not be desirable
> >> in all cases (eg, one where EVM digital signatures are shipped to end
> >> systems rather than EVM HMACs being generated locally).
> >
> > Commit 26ddabfe96bb "evm: enable EVM when X509 certificate is loaded"
> > already allows EVM to be enabled without loading a symmetric key.
>
> This only seems to be set if CONFIG_EVM_LOAD_X509 is set. Should there
> be some sort of callback to set this if a key is loaded onto the evm
> keyring at runtime?
Currently writing 1 to the securityfs file causes the EVM key to be
loaded. I would extend the existing evm_write_key(). Writing 2, for
example, might skip attempting to load the EVM key. You'll probably
want to make sure that a public key has been loaded first.
Mimi
next prev parent reply other threads:[~2017-10-02 19:41 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-27 22:16 RFC: Make it practical to ship EVM signatures Matthew Garrett
2017-09-27 22:16 ` [PATCH 1/6] IMA: Allow EVM validation on appraisal even without a symmetric key Matthew Garrett
2017-10-01 2:08 ` Mimi Zohar
2017-10-02 17:02 ` Matthew Garrett
2017-10-02 19:41 ` Mimi Zohar [this message]
2017-09-27 22:16 ` [PATCH 2/6] EVM: Add infrastructure for making EVM fields optional Matthew Garrett
2017-09-27 22:16 ` [PATCH 3/6] EVM: Allow userland to override the default EVM attributes Matthew Garrett
2017-09-27 22:16 ` [PATCH 4/6] EVM: Add an hmac_ng xattr format Matthew Garrett
2017-09-27 22:16 ` [PATCH 5/6] EVM: Write out HMAC xattrs in the new format Matthew Garrett
2017-09-27 22:16 ` [PATCH 6/6] EVM: Add a new digital signature format Matthew Garrett
2017-09-28 20:12 ` RFC: Make it practical to ship EVM signatures Mimi Zohar
2017-09-28 21:13 ` Matthew Garrett
2017-09-29 0:53 ` Mimi Zohar
2017-09-29 18:09 ` Matthew Garrett
2017-09-29 19:02 ` Mimi Zohar
2017-09-29 19:17 ` Matthew Garrett
2017-09-29 20:01 ` Mimi Zohar
2017-09-29 20:09 ` Matthew Garrett
2017-10-01 2:36 ` Mimi Zohar
2017-10-02 17:09 ` Matthew Garrett
2017-10-02 19:54 ` Mimi Zohar
[not found] ` <CACdnJutYw7Pgh-EwWuwp9Wz+5KzoreZVr+c6UV30zC__8FZSVA@mail.gmail.com>
[not found] ` <1506974574.5691.304.camel@linux.vnet.ibm.com>
2017-10-02 20:07 ` Matthew Garrett
2017-10-09 17:51 ` Mimi Zohar
2017-10-09 17:59 ` Matthew Garrett
2017-10-09 18:15 ` Mimi Zohar
2017-10-09 18:18 ` Matthew Garrett
2017-10-09 18:40 ` Mimi Zohar
[not found] ` <20171009232314.545de76a@totoro>
[not found] ` <1507583449.3748.46.camel@linux.vnet.ibm.com>
[not found] ` <20171010003326.6409ae23@totoro>
2017-10-09 21:40 ` Mimi Zohar
2017-10-09 23:10 ` Mikhail Kurinnoi
2017-10-10 19:07 ` Mimi Zohar
2017-10-12 23:09 ` Dmitry Kasatkin
2017-10-18 19:48 ` Dmitry Kasatkin
2017-10-18 20:30 ` Mimi Zohar
2017-10-18 20:37 ` Dmitry Kasatkin
2017-10-18 21:02 ` Mikhail Kurinnoi
2017-10-18 21:07 ` Mimi Zohar
2017-10-19 10:14 ` Dmitry Kasatkin
2017-10-19 11:43 ` Mimi Zohar
2017-10-19 17:08 ` Matthew Garrett
2017-10-19 18:38 ` Dmitry Kasatkin
2017-10-19 10:36 ` Dmitry Kasatkin
2017-10-19 11:45 ` Mimi Zohar
2017-10-02 14:53 ` Roberto Sassu
2017-10-02 8:55 ` Roberto Sassu
-- strict thread matches above, loose matches on Subject: below --
2017-10-19 16:12 [PATCH 1/6] IMA: Allow EVM validation on appraisal even without a symmetric key Dmitry Kasatkin
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