Re: API definition for LUKS key management [V2]

[Maxim Levitsky]

On Mon, 2019-11-25 at 19:45 +0100, Max Reitz wrote:
> On 22.11.19 15:22, Maxim Levitsky wrote:
> > Hi!
> > 
> > This is the second version of the proposed QMP API for key management,
> > after discussion with Keven and Max.
> > 
> > Will this work?
> > 
> > Adding Peter Krempa to CC, to hear his opinion from the 
> > libvirt side.
> > 
> > Best regards,
> >     Maxim Levitsky
> 
> Looks good to me overall.  I don’t think we need to overly push having
> the same interface for create and amend, because I don’t see much to be
> gained from it.

Thanks!!
> 
> [...]
> 
> > diff --git a/qapi/crypto.json b/qapi/crypto.json
> > index b2a4cff683..019db682cd 100644
> > --- a/qapi/crypto.json
> > +++ b/qapi/crypto.json
> > @@ -309,3 +309,56 @@
> >    'base': 'QCryptoBlockInfoBase',
> >    'discriminator': 'format',
> >    'data': { 'luks': 'QCryptoBlockInfoLUKS' } }
> > +
> > +
> > +##
> > +# @LUKSKeyslotUpdate:
> > +#
> > +# @keyslot:         If specified, will update only keyslot with this index
> > +#
> > +# @old-secret:      If specified, will only update keyslots that
> > +#                   can be opened with password which is contained in
> > +#                   QCryptoSecret with @old-secret ID
> > +#
> > +#                   If neither @keyslot nor @old-secret is specified,
> > +#                   first empty keyslot is selected for the update
> > +#
> > +# @new-secret:      The ID of a QCryptoSecret object providing a new 
> > decryption
> > +#                   key to place in all matching keyslots. Empty string 
> > erases the
> > +#                   keyslot.
> 
> Hm...  Can’t we make this some string-or-null alternate type so that
> null will erase the keyslot?  That would make more sense to me.

Agree. I'll see if can get an alternate to work here.

> 
> Max
> 
> > +# @iter-time:       number of milliseconds to spend in
> > +#                   PBKDF passphrase processing
> > +##
> > +{ 'struct': 'LUKSKeyslotUpdate',
> > +  'data': {
> > +         '*keyslot': 'int',
> > +         '*old-secret': 'str',
> > +         'new-secret' : 'str',
> > +         '*iter-time' : 'int' } }
> 
> 

Best regards,
        Maxim Levitsky