[tomoyo-users-en 450] Disallow read/write on any file in Ubuntu Linux 10.04 kernel

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TEH JIA YEW jyteh****@yahoo*****
Thu Jan 26 20:37:31 JST 2012


Dear Tomoyo Users,
1. Wishing ALL Tomoyo Users who celebrate the Lunar New Year 
 - a Happy belated Lunar New year 2012! I am a postgraduate student working towards the development of a Linux Rootkit Secure Kernel and I am attached to a research university in Malaysia.

2. Million thanks to Tetsuo Handa for the info how enabling IMA with Tomoyo- I managed to have both enabled as part of my Ubuntu 10.04 kernel.
3. I have some queries - pertaining to the File-system security features of Tomoyo  Linux.
4. I am planning to use IMA to create a clean database of SHA1s from " cat /sys/kernel/security/ima/ascii_runtime_measurements". The clean database of SHA1s will be compared to runtime database of SHA1s also from  
" cat /sys/kernel/security/ima/ascii_runtime_measurements". If any SHA1s changed, alert will be raised and any read  or write access to
critical kernel files will be denied. 
I plan to use Tomoyo 1.8.3 to perform the denial of 
read  or write access to 
critical kernel files

5. This is where my questions come in:
6. Can  Tomoyo 1.8.3 be used to disallow read& write access to kernel files and any files in the "/ " filesystem?  
7.I had read all the pages in the "TOMOYO Linux 1.8.x : The Official Guide" documentation as per : "http://tomoyo.sourceforge.jp/1.8/index.html.en" but so far my conclusion is that Tomoyo only permits  
disallow read & write access
 of files grouped under a certain domain where a process runs.
8. Referring to "http://tomoyo.sourceforge.jp/1.8/chapter-5.html.en", sections 5.1 and  5.4; what I mean is that, Tomoyo secures binaries and process and any config files in relation to that binary or process. For example, all files in the "/usr/sbin/httpd" domain  are secured and policy changes such as allow read/write can be applied to the files in the "/usr/sbin/httpd" domain.

9. Now, in reference to my plans in no.4 above, would it be possible if I have a domain that consists of ALL kernel files, and when SHA1s of files differs, have a TOMOYO policy disallow read/write access to  ALL kernel files in the my domain?  
10.What I mean is that can Tomoyo work based on a domain of files instead of domain of applications or binaries or services as per "http://tomoyo.sourceforge.jp/1.8/chapter-5.html.en"?
Sorry for the long mail and thanks in advance for any help given.
rgdsjyteh




--- On Sat, 1/7/12, tomoy****@lists***** <tomoy****@lists*****> wrote:

From: tomoy****@lists***** <tomoy****@lists*****>
Subject: tomoyo-users-en Digest, Vol 42, Issue 3
To: tomoy****@lists*****
Date: Saturday, January 7, 2012, 11:00 AM

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Today's Topics:

   1. [tomoyo-users-en   439] Re: tomoyo-users-en Digest, Vol 42,
      Issue 2 (TEH JIA YEW)


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Message: 1
Date: Thu, 5 Jan 2012 21:41:37 -0800 (PST)
From: TEH JIA YEW <jyteh****@yahoo*****>
Subject: [tomoyo-users-en   439] Re: tomoyo-users-en Digest, Vol 42,
    Issue 2
To: tomoy****@lists*****
Message-ID:
    <13258****@web16*****>
Content-Type: text/plain; charset="iso-8859-1"

?
Dear Tetsuo Handa
,
1. Thank you for your fast reply & Happy New Year 2012!
?2. You want to use TOMOYO 1.8 + IMA on Ubuntu 10.04, right?
?
Ans: Yes.
3. will do as suggested. Thank you very much for your kind help.
rgdsjyteh.
--- On Fri, 1/6/12, tomoy****@lists***** <tomoy****@lists*****> wrote:

From: tomoy****@lists***** <tomoy****@lists*****>
Subject: tomoyo-users-en Digest, Vol 42, Issue 2
To: tomoy****@lists*****
Date: Friday, January 6, 2012, 11:00 AM

Send tomoyo-users-en mailing list submissions to
??? tomoy****@lists*****

To subscribe or unsubscribe via the World Wide Web, visit
??? http://lists.sourceforge.jp/mailman/listinfo/tomoyo-users-en
or, via email, send a message with subject or body 'help' to
??? tomoy****@lists*****

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??? tomoy****@lists*****

When replying, please edit your Subject line so it is more specific
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Today's Topics:

???1. [tomoyo-users-en 437] How to Download Tomoyo Source Code at
? ? ? http://tomoyo.sourceforge.jp/cgi-bin/lxr/source? (TEH JIA YEW)
???2. [tomoyo-users-en 438] Re: How to Download Tomoyo Source Code
? ? ? at??? http://tomoyo.sourceforge.jp/cgi-bin/lxr/source? (Tetsuo Handa)


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Message: 1
Date: Thu, 5 Jan 2012 00:18:06 -0800 (PST)
From: TEH JIA YEW <jyteh****@yahoo*****>
Subject: [tomoyo-users-en 437] How to Download Tomoyo Source Code at
??? http://tomoyo.sourceforge.jp/cgi-bin/lxr/source?
To: tomoy****@lists*****
Message-ID:
??? <13257****@web16*****>
Content-Type: text/plain; charset="iso-8859-1"

Dear Tomoyo User,
1. Goo day and Happy New Year 2012.2. I am a Postgraduate Research Student working on implementation on Linux Security for Linux File-systems using Tomoyo Linux. I am attached to a research university in Malaysia.3. I need to enable IMA in kernel 2.6.32-generic-ccs as part of my work.4. Hence I need the entire Tomoyo kernel source to ensure that both IMA and Tomoyo in http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/?v=linux-2.6.32.52-ccs-1.8.3 can be compiled into one single kernel.5. I had tried downloading the codes from no. 4 above using git , svn and cvs but no success.6. Highly appreciate if any one can tell me on how to download all codes from??
http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/?v=linux-2.6.32.52-ccs-1.8.3 ??
?
Thank you for your help.
rgdsjyteh.
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Message: 2
Date: Thu, 05 Jan 2012 18:10:55 +0900
From: Tetsuo Handa <from-****@I-lov*****>
Subject: [tomoyo-users-en 438] Re: How to Download Tomoyo Source Code
??? at??? http://tomoyo.sourceforge.jp/cgi-bin/lxr/source?
To: tomoy****@lists*****
Message-ID: <20120****@www26*****>
Content-Type: text/plain; charset="ISO-2022-JP"

Hello.

TEH JIA YEW wrote:
> 3. I need to enable IMA in kernel 2.6.32-generic-ccs as part of my work.

You want to use TOMOYO 1.8 + IMA on Ubuntu 10.04, right?

> 4. Hence I need the entire Tomoyo kernel source to ensure that both IMA and
? Tomoyo in http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/?v=linux-2.6.32.52-ccs-1.8.3
> can be compiled into one single kernel.

You can use a build script available at
http://sourceforge.jp/projects/tomoyo/svn/view/trunk/1.8.x/ccs-patch/specs/build-ubuntu_10.04.sh?root=tomoyo&view=co&revision=5711&content-type=text%2Fplain .
You will get 2.6.32-generic-ccs kernel deb packages by running this script on a
2.6.32-generic kernel on Ubuntu 10.04.
In order to enable IMA, be sure to insert

? sed -i -e 's/# CONFIG_IMA is not set/CONFIG_IMA=y/' -- debian.master/config/config.common.ubuntu

between

? # Start compilation.

and

? debian/rules binary-headers || die "Failed to build kernel package."

of this script.

IMA is already enabled (i.e. built with CONFIG_IMA=y) if you can use
RHEL6/Fedora14 and later instead of Ubuntu 10.04.



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