linux-kernel - Re: TOMOYO in linux-next

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Message-ID: <alpine.LNX.1.10.0903291613360.20606@be10.lrz>
Date:	Sun, 29 Mar 2009 16:25:54 +0200 (CEST)
From:	Bodo Eggert <7eggert@....de>
To:	Pavel Machek <pavel@....cz>
cc:	Bodo Eggert <7eggert@....de>, James Morris <jmorris@...ei.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: TOMOYO in linux-next

On Sun, 29 Mar 2009, Pavel Machek wrote:
> On Fri 2009-03-27 14:04:32, Bodo Eggert wrote:
>> On Fri, 27 Mar 2009, Pavel Machek wrote:
>>> On Fri 2009-03-27 10:28:07, Bodo Eggert wrote:
>>>> Pavel Machek <pavel@....cz> wrote:

>>>>> I don't think merging that is good idea. Security should be doable
>>>>> without making shell-like glob matching...
>>>>
>>>> How do you suppose a security system should handle mozilla modifying
>>>> ~/.bashrc differently from downloading something to ~/pr0n.jpg?
>>>
>>> How does shell-like glob matching help there? You'd need to parse
>>> /etc/passwd to find all ~ directories...
>>
>> That is, if you'd use HOME=`dd if=/dev/urandom ...`.
>>
>> If you have your users in /home/user, you can tell /home/*/.*
>> is bad, /home/*/[^.]* is OK.
>
> On the common systems I know of, homes are spread over different
> volumes and different directories. TOMOYO's wildcards do _not_ solve
> this particular problems.

Don't do that then. If you start having user's homes at 
/usr/local/sbin/something/, your systenm is FUBAR anyway.

Put your homes into /home/volume/group/user (=~ /home/*/*/*/.*).

>> How would you exclude mozilla from writing to .* then? ".a" is bad,
>> ".b" is bad ...? or "A" is OK, "a" is OK, "zzzzzzzzzzzzz" is OK"?
>> Either way, you'd need several universes to store the security profile.
>
> What is magic about .* files? I want mozilla to store the pictures as
> .naughty.picture.jpg -- I don't see anything wrong with that.

As long as you have a guaranteed-to-be-complete list of config files, you 
can get along without wildcards. And still if you do, I'll write a program 
to make it incomplete.
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