Re: encryption, partitioning, was: Workstation WG meeting recap 2018-Dec-03

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On Thu, Dec 6, 2018 at 3:13 AM Javier Martinez Canillas
<javierm@xxxxxxxxxx> wrote:
> > On 05-12-18 23:58, Chris Murphy wrote:

> >> b. Windows laptops have TPM 2.0 which I can't get to work on Linux
> >> (works fine on Windows 10).
> >> https://bugzilla.kernel.org/show_bug.cgi?id=185631

> This seems to be a driver issue. Bugzilla usually is not the best channel to
> report kernel issues but instead the subsystem mailing list. For TPM this is
> linux-integrity@xxxxxxxxxxxxxxx. Could you please post your issue there?

Yes.


>
> >> c. Can a TMP be reliably shared by both Windows and Fedora in a dual
> >> boot configuration?
> >
> > Javier, Peter, can you answer this please ?
> >
>
> This is a two part question I think. First is the measurements and since the
> BitLocker seals against a PCR state when booting with the Windows bootloader
> this means that we can't chain-load Windows from grub2 since the measurements
> would be different and prevent BitLocker to unlock the encrypted disk.
>
> So for this case Windows has to be booted using the EFI firmware and having a
> separate boot entry. This is my understanding at least, I don't have a Windows
> installation to test.
>
> The second part is the key management. Clevis currently expects that the key
> hierarchies are not password protected. This is because asking the user for a
> password would defeat the purpose of automatically unlocking the LUKS volume.

Why bother encrypting anything if it's going to be automatically
unlocked just by booting? If the login window is a sufficient barrier
to exfiltrating and modifying user files on an unlocked volume, then
it's a sufficient barrier for an unencrypted volume because it is in
effect a plaintext volume, automatically without a passphrase, merely
when powered on.

> Also fscrypt is only supported by ext4, right? It would be better fo find a
> solution that wouldn't impose a specific filesystem to the user.

fscrypt is today supported by ext4, f2fs, and UBIFS. There are plans
to support XFS and Btrfs but I have no idea what their time frames
are, reflinks and snapshots add complications.


-- 
Chris Murphy
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