Re: [Qemu-block] [PATCH v8 09/20] qcow: convert QCow to use QCryptoBlock for encryption

[Max Reitz]

On 2017-06-01 19:27, Daniel P. Berrange wrote:
> This converts the qcow driver to make use of the QCryptoBlock
> APIs for encrypting image content. This is only wired up to
> permit use of the legacy QCow encryption format. Users who wish
> to have the strong LUKS format should switch to qcow2 instead.
> 
> With this change it is now required to use the QCryptoSecret
> object for providing passwords, instead of the current block
> password APIs / interactive prompting.
> 

Beware, nit picks incoming:

>   $QEMU \
>     -object secret,id=sec0,filename=/home/berrange/encrypted.pw \>     -drive 
> file=/home/berrange/encrypted.qcow,encrypt.format=qcow,\

encrypt.format should be "aes".

>            encrypt.key-secret=sec0

This doesn't work at all, though, because:

Use of AES-CBC encrypted qcow images is no longer supported in system
emulators
You can use 'qemu-img convert' to convert your image to an alternative
supported format, such as unencrypted qcow, or raw with the LUKS format
instead.

> 
> Likewise when creating images with the legacy AES-CBC format
> 
>   qemu-img create -f qcow \
>     -object secret,id=sec0,filename=/home/berrange/encrypted.pw \

Should be --object.

>     -o encrypt.format=aes,encrypt.key-secret=sec0 \
>     /home/berrange/encrypted.qcow

There should be a size here to make it work.

The patch itself does look good to me, though.

Max

> 
> Reviewed-by: Alberto Garcia <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>  block/crypto.c       |  10 +++
>  block/crypto.h       |  20 ++++--
>  block/qcow.c         | 198 
> +++++++++++++++++++++++++--------------------------
>  qapi/block-core.json |  38 +++++++++-
>  4 files changed, 158 insertions(+), 108 deletions(-)

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