linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>, Josh Boyer <jwboyer@gmail.com>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC 2/2] initramfs with digital signature protection
Date: Thu, 11 Apr 2013 11:08:05 +0300	[thread overview]
Message-ID: <CACE9dm9P3aFknDNuiwo27F0EWdx8ovg622tjK8biTf7ZVYavLA@mail.gmail.com> (raw)
In-Reply-To: <1365627922.2452.32.camel@falcor1.watson.ibm.com>

Hello,

(in plain text)

I respond to the original question of this thread.
signed initramfs allows not only to add keys to the keyrings but
perform other initialization,
which requires user-space.
Keys can be embedded into the kernel. This is fine.

Regards

- Dmitry


On Thu, Apr 11, 2013 at 12:05 AM, Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
> On Wed, 2013-04-10 at 15:42 -0400, Vivek Goyal wrote:
>> On Tue, Apr 09, 2013 at 11:07:10PM -0400, Mimi Zohar wrote:
>>
>> [..]
>> > The module keyring is a special case.  Loading these keys from the
>> > kernel and, presumably, locking the keyring is probably fine.  In the
>> > case of IMA, however, files will be signed by any number of package
>> > owners.  If the _ima keyring is locked by the kernel, how would you add
>> > these other keys?
>>
>> Who are package owners here. IOW, in typical IMA setup, where are the keys
>> and when are these keys loaded in ima keyring?
>
> Suppose I install third party packages not signed by the distro, but by
> the package owner (eg. google, rpmfusion, ...).  Not only does the
> package signature need to be verified on installation, but the files
> need to be installed with signatures.  For IMA to enforce file
> integrity, the package owner's public key needs to be added to the _ima
> keyring.
>
>> If we trust root and keys can be loaded any time later, then signed
>> initramfs will not solve the problem either.
>
> Locking the keyring in the kernel will limit the set of permitted keys
> to only those specified in UEFI db or builtin.  Locking the keyring in
> the "early" initramfs, will allow the system owner, whose key is in the
> UEFI db, to specify additional keys, such as those for third party
> packages.  Not all public keys belong in the UEFI db.
>
> Mimi
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

  reply	other threads:[~2013-04-11  8:08 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-05 12:34 [RFC 0/2] initramfs with digital signature protection Dmitry Kasatkin
2013-02-05 12:34 ` [RFC 1/2] export unpack_to_rootfs Dmitry Kasatkin
2013-02-05 16:48   ` Peter Jones
2013-02-05 17:16     ` Kasatkin, Dmitry
2013-02-08  8:30       ` Kasatkin, Dmitry
2013-02-05 12:34 ` [RFC 2/2] initramfs with digital signature protection Dmitry Kasatkin
2013-02-05 18:03   ` Peter Jones
2013-02-05 20:08     ` Mimi Zohar
2013-02-05 22:03     ` Kasatkin, Dmitry
2013-02-05 18:19   ` Matthew Garrett
2013-02-05 18:30     ` Matthew Garrett
2013-02-05 18:34     ` Vivek Goyal
2013-02-05 21:55       ` Kasatkin, Dmitry
2013-04-05 13:50         ` Vivek Goyal
2013-04-08 19:43           ` Mimi Zohar
2013-04-08 20:09             ` Vivek Goyal
2013-04-08 20:17               ` Josh Boyer
2013-04-09 14:38                 ` Vivek Goyal
2013-04-10  3:07                   ` Mimi Zohar
2013-04-10 19:42                     ` Vivek Goyal
2013-04-10 21:05                       ` Mimi Zohar
2013-04-11  8:08                         ` Dmitry Kasatkin [this message]
2013-04-11 14:52                         ` Vivek Goyal
2013-04-12 11:54                           ` Mimi Zohar
     [not found]                         ` <CACE9dm-GZpjco8u6jNxLQpYA8LYSeoVjsyyRXVwxXHzjO-LvGw@mail.gmail.com>
2013-04-11 14:55                           ` Vivek Goyal
2013-04-11 18:42                             ` Dmitry Kasatkin
2013-04-11 21:13                               ` Vivek Goyal
2013-04-12 12:03                                 ` Mimi Zohar
2013-02-05 20:36   ` Peter Jones
2013-02-05 22:09     ` Kasatkin, Dmitry
2013-02-06  5:04       ` H. Peter Anvin
2013-02-06  8:01         ` Kasatkin, Dmitry
2013-02-06 16:41           ` H. Peter Anvin
2013-02-08  9:16             ` Kasatkin, Dmitry
2013-02-08 15:49               ` H. Peter Anvin
2013-02-08 16:24                 ` Kasatkin, Dmitry
2013-02-08 16:50                   ` H. Peter Anvin
2013-02-07 17:05   ` Vivek Goyal
2013-02-08  8:34     ` Kasatkin, Dmitry
2013-02-08 13:27       ` Kasatkin, Dmitry
2013-02-11 21:59         ` Vivek Goyal

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CACE9dm9P3aFknDNuiwo27F0EWdx8ovg622tjK8biTf7ZVYavLA@mail.gmail.com \
    --to=dmitry.kasatkin@gmail.com \
    --cc=jwboyer@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=mjg59@srcf.ucam.org \
    --cc=vgoyal@redhat.com \
    --cc=zohar@linux.vnet.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).