[dm-crypt] LiveUSB encrypted.

[dm-crypt] LiveUSB encrypted.

[Marcos Barbosa]

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How i create a Ubuntu liveUSB inside a USB stick?
The trick: The casper files is inside a encrypted partition with LUKS.

any ideas?

-- 
Marcos Barbosa <marcosestevesbarbosa@gmail.com>

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Re: [dm-crypt] LiveUSB encrypted.

[Arno Wagner]

You don't. What you do instead is use an encrypted 
data partition, which may be supported by some
Ubuntu tool.

The problem is that the kernel and an initrd have to
reside outside of the encrypted space. There is no 
way around that. As a consequence, an attacker can
already modify those two and get complete control.

If you are worried about this, use some form of
physical protection. Weak protection comes from using
write-once media like a CD-R. Stronger comes from
using an encrypted memory-stick with keypad. (Beware,
there are secure and insecure ones on the market.)
You can also ware the stick around your neck.

Arno

On Wed, Nov 09, 2011 at 04:41:44PM -0200, Marcos Barbosa wrote:
> How i create a Ubuntu liveUSB inside a USB stick?
> The trick: The casper files is inside a encrypted partition with LUKS.
> 
> any ideas?
> 
> -- 
> Marcos Barbosa <marcosestevesbarbosa@gmail.com>

> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt


-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

Re: [dm-crypt] LiveUSB encrypted.

[Marcos Barbosa]

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Hello Arno,

I can survive if kernel and initrd stay in a separated partition. May be i
create a script to generate hash and sign them. If I use a separated
partition, what is the next logical step?

2011/11/9 Arno Wagner <arno@wagner.name>

> You don't. What you do instead is use an encrypted
> data partition, which may be supported by some
> Ubuntu tool.
>
> The problem is that the kernel and an initrd have to
> reside outside of the encrypted space. There is no
> way around that. As a consequence, an attacker can
> already modify those two and get complete control.
>
> If you are worried about this, use some form of
> physical protection. Weak protection comes from using
> write-once media like a CD-R. Stronger comes from
> using an encrypted memory-stick with keypad. (Beware,
> there are secure and insecure ones on the market.)
> You can also ware the stick around your neck.
>
> Arno
>
> On Wed, Nov 09, 2011 at 04:41:44PM -0200, Marcos Barbosa wrote:
> > How i create a Ubuntu liveUSB inside a USB stick?
> > The trick: The casper files is inside a encrypted partition with LUKS.
> >
> > any ideas?
> >
> > --
> > Marcos Barbosa <marcosestevesbarbosa@gmail.com>
>
> > _______________________________________________
> > dm-crypt mailing list
> > dm-crypt@saout.de
> > http://www.saout.de/mailman/listinfo/dm-crypt
>
>
> --
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email:
> arno@wagner.name
> GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25
> 338F
> ----
> Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
>
> If it's in the news, don't worry about it.  The very definition of
> "news" is "something that hardly ever happens." -- Bruce Schneier
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt
>



-- 
Marcos Barbosa <marcosestevesbarbosa@gmail.com>

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Re: [dm-crypt] LiveUSB encrypted.

[Arno Wagner]

Hi Marcos,

I actually do not know in detail. Basically you need a 
bootloader to load kernel and initrd, and the initrd then needs 
to decrypt the encrypted root partition and mount it as such.

Personally I do not use initrd in my own installations.
For encrypted data on USB, an encrypted user area is quite
enough for me. (I use knoppix, it offers to create one
when booted from USB stick the first time).

There are some people on the list, that have worked on 
something like you want. Maybe search the archves and ask
them directly.

Arno

On Wed, Nov 09, 2011 at 07:26:26PM -0200, Marcos Barbosa wrote:
> Hello Arno,
> 
> I can survive if kernel and initrd stay in a separated partition. May be i
> create a script to generate hash and sign them. If I use a separated
> partition, what is the next logical step?
> 
> 2011/11/9 Arno Wagner <arno@wagner.name>
> 
> > You don't. What you do instead is use an encrypted
> > data partition, which may be supported by some
> > Ubuntu tool.
> >
> > The problem is that the kernel and an initrd have to
> > reside outside of the encrypted space. There is no
> > way around that. As a consequence, an attacker can
> > already modify those two and get complete control.
> >
> > If you are worried about this, use some form of
> > physical protection. Weak protection comes from using
> > write-once media like a CD-R. Stronger comes from
> > using an encrypted memory-stick with keypad. (Beware,
> > there are secure and insecure ones on the market.)
> > You can also ware the stick around your neck.
> >
> > Arno
> >
> > On Wed, Nov 09, 2011 at 04:41:44PM -0200, Marcos Barbosa wrote:
> > > How i create a Ubuntu liveUSB inside a USB stick?
> > > The trick: The casper files is inside a encrypted partition with LUKS.
> > >
> > > any ideas?
> > >
> > > --
> > > Marcos Barbosa <marcosestevesbarbosa@gmail.com>
> >
> > > _______________________________________________
> > > dm-crypt mailing list
> > > dm-crypt@saout.de
> > > http://www.saout.de/mailman/listinfo/dm-crypt
> >
> >
> > --
> > Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email:
> > arno@wagner.name
> > GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25
> > 338F
> > ----
> > Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
> >
> > If it's in the news, don't worry about it.  The very definition of
> > "news" is "something that hardly ever happens." -- Bruce Schneier
> > _______________________________________________
> > dm-crypt mailing list
> > dm-crypt@saout.de
> > http://www.saout.de/mailman/listinfo/dm-crypt
> >
> 
> 
> 
> -- 
> Marcos Barbosa <marcosestevesbarbosa@gmail.com>

> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt


-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

Re: [dm-crypt] LiveUSB encrypted.

[Milan Broz]

On 11/10/2011 11:30 AM, Arno Wagner wrote:
> I actually do not know in detail. Basically you need a 
> bootloader to load kernel and initrd, and the initrd then needs 
> to decrypt the encrypted root partition and mount it as such.

grub2 boor loader should be able to decrypt full LUKS mapping without initramfs.

Milan

Re: [dm-crypt] LiveUSB encrypted.

[Arno Wagner]

That would be nice. And a reason to switch bootloaders.

Arno

On Thu, Nov 10, 2011 at 12:00:36PM +0100, Milan Broz wrote:
> On 11/10/2011 11:30 AM, Arno Wagner wrote:
> > I actually do not know in detail. Basically you need a 
> > bootloader to load kernel and initrd, and the initrd then needs 
> > to decrypt the encrypted root partition and mount it as such.
> 
> grub2 boor loader should be able to decrypt full LUKS mapping without initramfs.
> 
> Milan
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt
> 

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

Re: [dm-crypt] LiveUSB encrypted.

[Nikolay Kichukov]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

It SHOULD.

When I have attempted to make it boot I failed. The module was in beta development back then, maybe this have changed now.

Cheers,
- -Nik

On 11/10/2011 01:44 PM, Arno Wagner wrote:
> That would be nice. And a reason to switch bootloaders.
> 
> Arno
> 
> On Thu, Nov 10, 2011 at 12:00:36PM +0100, Milan Broz wrote:
>> On 11/10/2011 11:30 AM, Arno Wagner wrote:
>>> I actually do not know in detail. Basically you need a 
>>> bootloader to load kernel and initrd, and the initrd then needs 
>>> to decrypt the encrypted root partition and mount it as such.
>>
>> grub2 boor loader should be able to decrypt full LUKS mapping without initramfs.
>>
>> Milan
>> _______________________________________________
>> dm-crypt mailing list
>> dm-crypt@saout.de
>> http://www.saout.de/mailman/listinfo/dm-crypt
>>
> 
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Re: [dm-crypt] LiveUSB encrypted.

[Marcos Barbosa]

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Thanks guys.

Any details about the use of GRUB2 to decrypt?
parameters, etc. or a link to documentation?

2011/11/10 Nikolay Kichukov <hijacker@oldum.net>

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> It SHOULD.
>
> When I have attempted to make it boot I failed. The module was in beta
> development back then, maybe this have changed now.
>
> Cheers,
> - -Nik
>
> On 11/10/2011 01:44 PM, Arno Wagner wrote:
> > That would be nice. And a reason to switch bootloaders.
> >
> > Arno
> >
> > On Thu, Nov 10, 2011 at 12:00:36PM +0100, Milan Broz wrote:
> >> On 11/10/2011 11:30 AM, Arno Wagner wrote:
> >>> I actually do not know in detail. Basically you need a
> >>> bootloader to load kernel and initrd, and the initrd then needs
> >>> to decrypt the encrypted root partition and mount it as such.
> >>
> >> grub2 boor loader should be able to decrypt full LUKS mapping without
> initramfs.
> >>
> >> Milan
> >> _______________________________________________
> >> dm-crypt mailing list
> >> dm-crypt@saout.de
> >> http://www.saout.de/mailman/listinfo/dm-crypt
> >>
> >
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> -----END PGP SIGNATURE-----
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt
>



-- 
Marcos Barbosa <marcosestevesbarbosa@gmail.com>

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