From: Ken Goldman <kgoldman-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
To: tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Cc: linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC] tpm2-space: add handling for global session exhaustion
Date: Tue, 31 Jan 2017 14:28:06 -0500 [thread overview]
Message-ID: <o6qog0$30l$1@blaine.gmane.org> (raw)
In-Reply-To: <1485792295.2518.23.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
On 1/30/2017 11:04 AM, James Bottomley wrote:
>
> This depends what your threat model is. For ssh keys, you worry
> that someone might be watching, so you use HMAC authority even for a
> local TPM.
If someone can "watch" my local process, they can capture my password
anyway. Does using a password that the attacker knows to HMAC the
command help?
> In the cloud, you don't quite know where the TPM is, so again you'd
> use HMAC sessions ... however, in both use cases the sessions should
> be very short lived.
If your entire application is in the cloud, then I think the same
question as above applies.
If you have your application on one platform (that you trust) and the
TPM is on another (that you don't trust), then I absolutely agree that
HMAC (and parameter encryption) are necessary.
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next prev parent reply other threads:[~2017-01-31 19:28 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-18 20:48 [RFC] tpm2-space: add handling for global session exhaustion James Bottomley
2017-01-18 20:48 ` James Bottomley
[not found] ` <1484772489.2396.2.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-01-19 12:25 ` Jarkko Sakkinen
2017-01-19 12:25 ` [tpmdd-devel] " Jarkko Sakkinen
[not found] ` <20170119122533.d7h5rgatpwl3qmcl-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-01-19 12:41 ` Jarkko Sakkinen
2017-01-19 12:41 ` [tpmdd-devel] " Jarkko Sakkinen
[not found] ` <20170119124101.nw7a7m735zhiivfo-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-01-27 21:20 ` Ken Goldman
2017-01-27 21:59 ` James Bottomley
2017-01-27 21:59 ` [tpmdd-devel] " James Bottomley
2017-01-19 12:59 ` James Bottomley
2017-01-19 12:59 ` [tpmdd-devel] " James Bottomley
2017-01-20 13:40 ` Jarkko Sakkinen
2017-01-27 21:42 ` Ken Goldman
2017-01-27 22:04 ` James Bottomley
2017-01-27 22:04 ` [tpmdd-devel] " James Bottomley
[not found] ` <1485554699.3229.20.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-01-27 23:35 ` Jason Gunthorpe
2017-01-27 23:35 ` [tpmdd-devel] " Jason Gunthorpe
[not found] ` <20170127233513.GA28995-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-27 23:48 ` James Bottomley
2017-01-27 23:48 ` [tpmdd-devel] " James Bottomley
2017-01-30 0:52 ` Ken Goldman
2017-01-30 0:52 ` Ken Goldman
2017-01-30 16:04 ` James Bottomley
2017-01-30 16:04 ` [tpmdd-devel] " James Bottomley
[not found] ` <1485792295.2518.23.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-01-30 21:58 ` Jarkko Sakkinen
2017-01-30 21:58 ` [tpmdd-devel] " Jarkko Sakkinen
[not found] ` <20170130215815.4lr42ob7e4cycwgi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-01-30 22:13 ` James Bottomley
2017-01-30 22:13 ` [tpmdd-devel] " James Bottomley
[not found] ` <1485814388.2518.28.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-01-30 22:46 ` Ken Goldman
2017-01-31 13:31 ` Jarkko Sakkinen
2017-01-31 13:31 ` [tpmdd-devel] " Jarkko Sakkinen
2017-02-10 17:22 ` Kenneth Goldman
2017-01-31 19:28 ` Ken Goldman [this message]
2017-01-31 19:55 ` James Bottomley
2017-01-31 19:55 ` [tpmdd-devel] " James Bottomley
[not found] <jarkko.sakkinen@linux.intel.com>
2017-02-09 9:06 ` Dr. Greg Wettstein
[not found] ` <201702090906.v1996c6a015552-DHO+NtfOqB5PEDpkEIzg7wC/G2K4zDHf@public.gmane.org>
2017-02-09 15:19 ` Jarkko Sakkinen
[not found] ` <20170209151922.cqo32h4io5dqyvvw-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-02-09 19:04 ` Jason Gunthorpe
[not found] ` <20170209190426.GA1104-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-02-09 19:29 ` James Bottomley
[not found] ` <1486668591.2616.45.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-02-09 21:54 ` Jason Gunthorpe
2017-02-10 8:48 ` [tpmdd-devel] " Jarkko Sakkinen
[not found] ` <20170210084837.lq3mofgfwvjx623m-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-02-10 23:13 ` Kenneth Goldman
2017-02-09 20:05 ` James Bottomley
[not found] <James.Bottomley@HansenPartnership.com>
2017-02-10 10:03 ` Dr. Greg Wettstein
[not found] ` <201702101003.v1AA3plF029882-DHO+NtfOqB5PEDpkEIzg7wC/G2K4zDHf@public.gmane.org>
2017-02-10 16:46 ` James Bottomley
[not found] ` <1486745163.2502.26.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-02-10 21:13 ` Kenneth Goldman
2017-02-14 14:38 ` [tpmdd-devel] " Dr. Greg Wettstein
[not found] ` <20170214143829.GA28175-DHO+NtfOqB5PEDpkEIzg7wC/G2K4zDHf@public.gmane.org>
2017-02-14 16:47 ` James Bottomley
2017-02-10 21:18 ` Kenneth Goldman
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