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Hi Joerg,

thank you for your mail. The bug it is about is #930782 [1], and
fortunately there is a work-around:

> Locking the tomb specifying the valid cipher on the command line
works
>
>    $ tomb lock -k x.key -o aes-xts-plain64 x.tomb
>
>    [...]
>    tomb  .  Done locking x using Luks dm-crypt aes-xts-plain64
>    tomb (*) Your tomb is ready in x.tomb and secured with key x.key

This is something different than the luks1/luks2 issue upstream
referred to in [2].

Anyway, tomb 2.6+dfsg1-2~bpo10+1 has already been uploaded to the
backports NEW queue [3] and is awaiting release.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930782
[2] https://github.com/dyne/Tomb/blob/master/KNOWN_BUGS.md
[3] https://ftp-master.debian.org/backports-new.html

Sven

Am Dienstag, den 08.10.2019, 13:53 +0200 schrieb Joerg Bornemann:
> On Sun, 06 Oct 2019 22:43:32 +0200 Sven Geuer <debma...@g-e-u-e-r.de>
> wrote:
> 
> > Regarding 'important fix for usage of Tomb with cryptsetup 2.1':
> > This seems to refer to [2], 'Issue opening tombs with cryptsetup >
> > 2.0', which is an annoying bug but not a security issue.
> 
> It would be merely an annoying bug if there was a work-around.
> However, 
> this bug makes tomb unusable on buster:
> 
> $ tomb lock secret.tomb -k secret.tomb.key
> tomb  .  Commanded to lock tomb secret.tomb
> tomb  .  Checking if the tomb is empty (we never step on somebody
> else's 
> bones).
> tomb  .  Fine, this tomb seems empty.
> tomb  .  Key is valid.
> tomb  .  Locking using cipher: aes-xts-plain64:sha256
> tomb  .  A password is required to use key secret.tomb.key
> tomb  .  Password OK.
> tomb (*) Locking secret.tomb with secret.tomb.key
> tomb  .  Formatting Luks mapped device.
> tomb [W] cryptsetup luksFormat returned an error.
> tomb [E] Operation aborted.
> 
> I suggest to raise the severity again.
> 
> 
> BR,
> 
> Joerg
> 
> 
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