Re: [PATCH 2/2] qemu: Use secret objects to pass iSCSI passwords

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On 09/12/2017 09:36 AM, Peter Krempa wrote:
> On Tue, Sep 05, 2017 at 15:09:35 -0400, John Ferlan wrote:
>> https://bugzilla.redhat.com/show_bug.cgi?id=1425757
>>
>> The blockdev-add code provides a mechanism to sanely provide user
>> and password-secret arguments for iscsi without placing them on the
>> command line to be viewable by a 'ps -ef' type command or needing
>> to create separate -iscsi devices for each disk/volume found.
>>
>> So modify the iSCSI command line building to check for the presence
>> of the capability in order properly setup and use the domain master
>> secret object to encrypt the password in a secret object and alter
>> the parameters for the command line to utilize.
>>
>> Modify the xml2argvtest to exhibit the syntax for both disk and
>> hostdev configurations.
>>
>> Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
>> ---
>>  src/qemu/qemu_command.c                            | 19 ++++++++-
>>  src/qemu/qemu_domain.c                             |  4 ++
>>  ...xml2argv-disk-drive-network-iscsi-auth-AES.args | 39 ++++++++++++++++++
>>  ...uxml2argv-disk-drive-network-iscsi-auth-AES.xml | 43 +++++++++++++++++++
>>  ...ml2argv-hostdev-scsi-virtio-iscsi-auth-AES.args | 35 ++++++++++++++++
>>  ...xml2argv-hostdev-scsi-virtio-iscsi-auth-AES.xml | 48 ++++++++++++++++++++++
>>  tests/qemuxml2argvtest.c                           | 10 +++++
>>  7 files changed, 196 insertions(+), 2 deletions(-)
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-auth-AES.args
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-auth-AES.xml
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi-auth-AES.args
>>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi-auth-AES.xml
> 
> Most of the stuff here looks reasonable but I don't think we should mix
> the URI syntax with the file.param= syntax generated from the JSON
> objects. Since there's a capability when this is supported, the command
> line generator should use the new syntax.
> 
> You can mark it in qemuDiskSourceNeedsProps so that it uses the new
> generator if it's needed and supported and implement the JSON generator.
> 
> The rest should then work as expected.
> 

This is certainly where things didn't exactly match up the way I thought
you have desired the virstoragefile and virstoragetest code to work.

In particular, it's the "user" and "password-secret" options that cause
the disconnect since they're a @disk private object and not a @disk->src
object. I considered a number of different ways to cheat, but came up
empty on each, so I just followed the existing RBD code.

One cannot reconstruct the <auth> element properly given that all the
arguments have is a username and an alias, but would need to have either
a "usage" or "uuid" string. The secret object doesn't contain that
either, so it'd need to be stored somehow.

Perhaps if the @secinfo moved from private into source that would help,
although perhaps not following the RNG. Still there'd also have to be a
way to save the string used in the original <auth> element used to look
up the secret (either by uuid or by usage). Having the password-secret
alias is OK, but really not useful.

Maybe "some future" adjustment could modify the password-secret alias to
be (for example) "virtio-disk0-%s-secret0" where the %s is either a UUID
or a Usage string of the secret used to generate the object. Perhaps
even the unsigned char UUID too so as to not have too many extra "-"'s
to parse/read.  That'd be an awful alias, but serve a purpose as well.

A similar problem exists for RBD, but the RBD code in virstoragefile and
virstoragetest totally ignore the authentication pieces... That syntax
is a bit more hairly because it's only the RBD password-secret field
that needs the "file." (or not if -drive driver=rbd,... was supported).

John

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