Can't start vm with enc backing files, No secret with id 'sec0' ?

[18781374080]

Hey, guys

I've been working on whether libvirt supports encrypted snapshots,Here are my versions of libvirt and qemu

[root at xx ~]# libvirtd -V

libvirtd (libvirt) 4.5.0

[root at xx ~]# qemu-img -V

qemu-img version 2.12.0 (qemu-kvm-ev-2.12.0-33.1.el7_7.4)

Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

1. assign $MYSECRET to libvirt secret using the secret-define and secret-set-value commands,and $MYSECRET is in base64 format

MYSECRET=`printf %s "123456" | base64`

2. created a disk encrypted in luks format

qemu-img create --object secret,id=sec0,data=$MYSECRET,format=base64 -f qcow2 -o encrypt.format=luks,encrypt.key-secret=sec0 enc.qcow220G

3. The encrypted disk is defined in the XML configuration file, as shown below.Then I successfully started the virtual machine.

<disk type='file' device='disk'>

      <driver name='qemu' type='qcow2'/>

      <source file='/root/enc.qcow2'/>

       <backingStore/> 

      <target dev='hda' bus='ide'/>

      <encryption format='luks'>

        <secret type='passphrase' uuid='694bdf38-214e-48d3-8c4c-9dbbcf0f5fa0'/>

      </encryption>

      <alias name='ide0-0-0'/>

      <address type='drive' controller='0' bus='0' target='0' unit='0'/>

  </disk>

4. According to the qemu documentation, an encrypted snap.qcow2 disk was created with enc.qcow2 as backing

qemu-img create -f qcow2 -F qcow2 --object secret,id=sec0,data=$MYSECRET,format=base64 --object secret,id=sec1,data=$MYSECRET,format=base64 -o encrypt.format=luks,encrypt.key-secret=sec1 -b 'json:{"encrypt.key-secret": "sec0", "driver": "qcow2", "file": {"driver": "file", "filename": "/root/enc/enc.qcow2"}}' snap.qcow2

I used the same $MYSECRET as the password data for the disk. Here is the disk information for snap.qcow2

image: snap.qcow2

file format: qcow2

virtual size: 20G (21474836480 bytes)

disk size: 480K

encrypted: yes

cluster_size: 65536

backing file: json:{"encrypt.key-secret": "sec0", "driver": "qcow2", "file": {"driver": "file", "filename": "/root//enc.qcow2"}}

backing file format: qcow2

Format specific information:

    compat: 1.1

    lazy refcounts: false

    refcount bits: 16

    encrypt:

        ivgen alg: plain64

        hash alg: sha256

        cipher alg: aes-256

        uuid: ab0e3f87-35e7-40cb-9888-9fe9bb54e981

        format: luks

        cipher mode: xts

        slots:

            [0]:

                active: true

                iters: 115582

                key offset: 4096

                stripes: 4000

            [1]:

                active: false

                key offset: 262144

            [2]:

                active: false

                key offset: 520192

            [3]:

                active: false

                key offset: 778240

            [4]:

                active: false

                key offset: 1036288

            [5]:

                active: false

                key offset: 1294336

            [6]:

                active: false

                key offset: 1552384

            [7]:

                active: false

                key offset: 1810432

        payload offset: 2068480

        master key iters: 30085

    corrupt: false

5. Then I changed the configuration of the XML, as shown below.And re-define and start the virtual machine
<disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/root/snap.qcow2'/>
      <backingStore type='file'>
        <format type='qcow2'/>
        <source file='/root/enc.qcow2'/>
        <backingStore/>
      </backingStore>
      <target dev='hda' bus='ide'/>
      <encryption format='luks'>
        <secret type='passphrase' uuid='694bdf38-214e-48d3-8c4c-9dbbcf0f5fa0'/>
      </encryption>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
  </disk>

Then the startup failed and an error was thrown. As shown below.

qemu-kvm: -drive file=/root/enc/vm/enc-snap.qcow2,encrypt.format=luks,encrypt.key-secret=ide0-0-0-luks-secret0,format=qcow2,if=none,id=drive-ide0-0-0: Could not open backing file: No secret with id 'sec0'

The sec0 secret id could not be found in the backing file, this is my problem.

Is there a problem with the way I implemented it, or does libvirt currently not support this?

Any tips or help will be appreciated,  Looking forward to your reply. Thank you




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