Re: [Qemu-devel] [PATCH v5 07/11] authz: add QAuthZSimple object type for easy whitelist auth checks

[Daniel P . Berrangé]

On Thu, Oct 18, 2018 at 07:53:30PM +0200, Philippe Mathieu-Daudé wrote:
> Hi Daniel,
> 
> On 09/10/2018 15:04, Daniel P. Berrangé wrote:
> > In many cases a single VM will just need to whilelist a single identity
> > as the allowed user of network services. This is especially the case for
> > TLS live migration (optionally with NBD storage) where we just need to
> > whitelist the x509 certificate distinguished name of the source QEMU
> > host.
> > 
> > Via QMP this can be configured with:
> > 
> >   {
> >     "execute": "object-add",
> >     "arguments": {
> >       "qom-type": "authz-simple",
> >       "id": "authz0",
> >       "parameters": {
> >         "identity": "fred"
> >       }
> >     }
> >   }
> > 
> > Or via the command line
> > 
> >   -object authz-simple,id=authz0,identity=fred
> > 
> > Signed-off-by: Daniel P. Berrange <address@hidden>
> > ---
> >  authz/Makefile.objs    |   1 +
> >  authz/simple.c         | 122 +++++++++++++++++++++++++++++++++++++++++
> >  authz/trace-events     |   3 +
> >  include/authz/simple.h |  84 ++++++++++++++++++++++++++++
> >  qemu-options.hx        |  21 +++++++
> >  5 files changed, 231 insertions(+)
> >  create mode 100644 authz/simple.c
> >  create mode 100644 include/authz/simple.h
> > diff --git a/qemu-options.hx b/qemu-options.hx
> > index f139459e80..ef38ff19e2 100644
> > --- a/qemu-options.hx
> > +++ b/qemu-options.hx
> > @@ -4377,6 +4377,27 @@ e.g to launch a SEV guest
> >       .....
> >  
> >  @end example
> > +
> > +
> > address@hidden -object authz-simple,address@hidden,address@hidden
> > +
> > +Create an authorization object that will control access to network 
> > services.
> > +
> > +The @option{identity} parameter is identifies the user and its format
> > +depends on the network service that authorization object is associated
> > +with. For authorizing based on TLS x509 certificates, the identity must
> > +be the x509 distinguished name. Note that care must be taken to escape
> > +any commas in the distinguished name.
> > +
> > +An example authorization object to validate a x509 distinguished name
> > +would look like:
> > address@hidden
> > + # $QEMU \
> > +     ...
> > +     -object 
> > authz-simple,id=auth0,identity=CN=laptop.example.com,,O=Example 
> > Org,,L=London,,ST=London,,C=GB \
> > +     ...
> 
> This example does not work:
> 
> $ x86_64-softmmu/qemu-system-x86_64 -trace qauthz\* -object
> authz-simple,id=auth0,identity=CN=laptop.example.com,,O=Example
> Org,,L=London,,ST=London,,C=GB
> qemu-system-x86_64: -object
> authz-simple,id=auth0,identity=CN=laptop.example.com,,O=Example: Could
> not open 'Org,,L=London,,ST=London,,C=GB': No such file or directory
> 
> However escaping does:
> 
> $ x86_64-softmmu/qemu-system-x86_64 -trace qauthz\* -object
> authz-simple,id=auth0,identity='CN=laptop.example.com,,O=Example
> Org,,L=London,,ST=London,,C=GB'
> 
> With example fixed:
> 
> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
> Tested-by: Philippe Mathieu-Daudé <address@hidden>

I'll squash in:

diff --git a/qemu-options.hx b/qemu-options.hx
index ef38ff19e2..160db9c8d2 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4394,10 +4394,13 @@ would look like:
 @example
  # $QEMU \
      ...
-     -object authz-simple,id=auth0,identity=CN=laptop.example.com,,O=Example 
Org,,L=London,,ST=London,,C=GB \
+     -object 'authz-simple,id=auth0,identity=CN=laptop.example.com,,O=Example 
Org,,L=London,,ST=London,,C=GB' \
      ...
 @end example
 
+Note the use of quotes due to the x509 distinguished name containing
+whitespace, and escaping of ','.
+
 @end table
 
 ETEXI

Regards,
Daniel
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