From: "David Härdeman" <david@2gen.com>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Adrian Bunk <bunk@stusta.de>,
Christoph Hellwig <hch@infradead.org>,
keyrings@linux-nfs.org, linux-kernel@vger.kernel.org
Subject: Re: [Keyrings] Re: [PATCH 01/04] Add multi-precision-integer maths library
Date: Sun, 29 Jan 2006 12:33:20 +0100 [thread overview]
Message-ID: <20060129113320.GA21386@hardeman.nu> (raw)
In-Reply-To: <1138504829.8770.125.camel@lade.trondhjem.org>
On Sat, Jan 28, 2006 at 10:20:29PM -0500, Trond Myklebust wrote:
>On Sat, 2006-01-28 at 17:57 +0100, David Härdeman wrote:
>> What about the first paragraph of what I wrote? You are going to want to
>> keep often-used keys around somehow, proxy certificates is not a
>> solution for your own use of your personal keys and with the exception
>> of hardware solutions such as smart cards, the keys will be safer in the
>> kernel than in a user-space daemon...
>
>I don't get this explanation at all.
>
>Why would you want to use proxy certificates for you own use? Use your
>own certificate for your own processes, and issue one or more proxy
>certificates to any daemon that you want to authorise to do some limited
>task.
I meant that you can't use proxy certs for your own use, so you still need
to store your own cert/key somehow...and I still believe that the kernel
keyring is the best place...
>...and what does this statement about "keys being safer in the kernel"
>mean?
swap-out to disk, ptrace, coredump all become non-issues. And in
combination with some other security features (such as disallowing
modules, read/write of /dev/mem + /dev/kmem, limited permissions via
SELinux, etc), it becomes pretty hard for the attacker to get your
private key even if he/she manages to get access to the root account.
>> Further, the mpi and dsa code can also be used for supporting signed
>> modules and binaries...the "store dsa-keys in kernel" part adds 376
>> lines of code (counted with wc so comments and includes etc are also
>> counted)...
>
>Signed modules sounds like a better motivation, but is a full dsa
>implementation in the kernel really necessary to achieve this?
How would you do it otherwise?
Re,
David
next prev parent reply other threads:[~2006-01-29 11:34 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-26 21:58 [PATCH 00/04] Add DSA key type David Härdeman
2006-01-26 21:58 ` [PATCH 03/04] Add encryption ops to the keyctl syscall David Härdeman
2006-01-26 21:58 ` [PATCH 02/04] Add dsa crypto ops David Härdeman
2006-01-26 21:58 ` [PATCH 01/04] Add multi-precision-integer maths library David Härdeman
2006-01-27 9:28 ` Christoph Hellwig
2006-01-27 20:07 ` David Howells
2006-01-27 20:41 ` David Härdeman
2006-01-27 22:19 ` [Keyrings] " Trond Myklebust
2006-01-27 23:35 ` Kyle Moffett
2006-01-28 0:27 ` Adrian Bunk
2006-01-28 3:45 ` Trond Myklebust
2006-01-28 7:17 ` Kyle Moffett
2006-01-28 10:39 ` Adrian Bunk
2006-01-28 0:22 ` Adrian Bunk
2006-01-28 10:46 ` David Härdeman
2006-01-28 13:03 ` Adrian Bunk
2006-01-28 17:09 ` David Härdeman
2006-01-28 16:37 ` [Keyrings] " Trond Myklebust
2006-01-28 16:57 ` David Härdeman
2006-01-29 3:20 ` Trond Myklebust
2006-01-29 11:33 ` David Härdeman [this message]
2006-01-29 12:29 ` Adrian Bunk
2006-01-29 13:09 ` Arjan van de Ven
2006-01-29 20:05 ` Steve French
2006-01-29 20:52 ` Arjan van de Ven
2006-01-29 21:41 ` Steve French
2006-02-06 12:31 ` David Howells
2006-01-29 23:18 ` Adrian Bunk
2006-01-29 13:18 ` David Härdeman
2006-01-29 23:36 ` Adrian Bunk
2006-01-30 18:09 ` Nix
2006-01-29 16:38 ` Trond Myklebust
2006-01-29 18:49 ` Dax Kelson
2006-01-29 19:10 ` Trond Myklebust
2006-01-29 21:29 ` David Härdeman
2006-01-29 21:46 ` Trond Myklebust
2006-01-29 21:13 ` David Härdeman
2006-01-29 21:28 ` Trond Myklebust
2006-01-29 22:02 ` David Härdeman
2006-01-29 22:05 ` Trond Myklebust
2006-01-29 22:54 ` Kyle Moffett
2006-01-29 23:07 ` Trond Myklebust
2006-01-29 23:15 ` Adrian Bunk
2006-01-29 21:09 ` Pavel Machek
2006-01-26 21:58 ` [PATCH 04/04] Add dsa key type David Härdeman
2006-01-27 1:10 ` [PATCH 00/04] Add DSA " Herbert Xu
2006-01-27 7:18 ` David Härdeman
2006-01-27 20:11 ` David Howells
2006-01-27 23:22 ` Herbert Xu
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