libvirt users - Dec 2018 - Re: certificate pinning

And how libvirt checks that it trusts the CA? Just simply inspects the
cacert.pem file? Or it has some information inside about by which CA were
signed client and server certificates and then compares against stored
values? I mean can I just concatenate after signing or I need to combine
two CAs before generating libvirt's client and server certificates?

пн, 10 дек. 2018 г. в 13:11, Daniel P. Berrangé <berrange@redhat.com>:
> Re-adding the libvirt-users list - please don't take discussions
off-list.
>
> On Mon, Dec 10, 2018 at 01:10:18PM +0300, Anastasiya Ruzhanskaya wrote:
> > I already found out how to set up all the certificates and tls works
fine
> > for me.
> > What if I want to put a proxy between client and server in libvirt? He
> has
> > his own CA, and this is only one more CA I would like libvirt to trust
> to.
> > Is it somehow achievable? I see that libvirt takes certificates only
from
> > predefined paths. For me doesn't work if I just incert another CA
> > certificate to the cacert.pem file. Do you know any approaches how it
can
> > be made in another way?
>
> The cacert.pem file can contain multiple certificates, just concatenate
> all the CA pem files.
>
> >
> > пн, 10 дек. 2018 г. в 12:38, Daniel P. Berrangé
<berrange@redhat.com>:
> >
> > > On Sat, Dec 08, 2018 at 11:19:40AM +0300, Anastasiya Ruzhanskaya
wrote:
> > > > Hello!
> > > > Does libvirt uses certificate pinning in tls? I want to
setup a
> > > transparent
> > > > proxy (mitmproxy) and can't do this even after I added
mitmproxy ca
> > > > certificate to the trusted certificates in ubuntu.
> > >
> > > Libvirt doesn't ever use the global certificates stores,
because public
> > > CAs are not relevant to libvirt deployments - indeed trusting the
> global
> > > cert store in the OS would lower security by opening it upto
arbitrary
> > > CAs. See this doc for where libvirt finds CA certs
> > >
> > > https://libvirt.org/remote.html#Remote_certificates
> > >
> > >
> > > Regards,
> > > Daniel
> > > --
> > > |: https://berrange.com      -o-
> > > https://www.flickr.com/photos/dberrange :|
> > > |: https://libvirt.org         -o-
> > > https://fstop138.berrange.com :|
> > > |: https://entangle-photo.org    -o-
> > > https://www.instagram.com/dberrange :|
> > >
>
> Regards,
> Daniel
> --
> |: https://berrange.com      -o-
> https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org         -o-
> https://fstop138.berrange.com :|
> |: https://entangle-photo.org    -o-
> https://www.instagram.com/dberrange :|
>

On Mon, Dec 10, 2018 at 01:22:32PM +0300, Anastasiya Ruzhanskaya
wrote:
> And how libvirt checks that it trusts the CA? Just simply inspects the
> cacert.pem file? Or it has some information inside about by which CA were
> signed client and server certificates and then compares against stored
> values? I mean can I just concatenate after signing or I need to combine
> two CAs before generating libvirt's client and server certificates?
Libvirt will check that the server's certificate is signed by any one of
the CAs listed.

Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|

Ok, thank you. I will play around with it.

I also noticed, that libvirt does not use this SNI extension. Actually,this
not needed here, as we have only one location for server certificate, but
this requires some modifications in mitmproxy, as for example tls in web
browsers always include this SNI extensions.

Are there maybe other big differences in tls implementation in libvirt or
maybe some assumptions that are taken during tls handhake process?

пн, 10 дек. 2018 г. в 13:25, Daniel P. Berrangé <berrange@redhat.com>:
> On Mon, Dec 10, 2018 at 01:22:32PM +0300, Anastasiya Ruzhanskaya wrote:
> > And how libvirt checks that it trusts the CA? Just simply inspects the
> > cacert.pem file? Or it has some information inside about by which CA
were
> > signed client and server certificates and then compares against stored
> > values? I mean can I just concatenate after signing or I need to
combine
> > two CAs before generating libvirt's client and server
certificates?
>
> Libvirt will check that the server's certificate is signed by any one
of
> the CAs listed.
>
> Regards,
> Daniel
> --
> |: https://berrange.com      -o-
> https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org         -o-
> https://fstop138.berrange.com :|
> |: https://entangle-photo.org    -o-
> https://www.instagram.com/dberrange :|
>