Re: [Qemu-devel] [PATCH v3 07/10] qemu-nbd: add support for ACLs for TLS clients

[Eric Blake <eblake@redhat.com>]

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On 03/10/2016 11:59 AM, Daniel P. Berrange wrote:
> Currently any client which can complete the TLS handshake
> is able to use the NBD server. The server admin can turn
> on the 'verify-peer' option for the x509 creds to require
> the client to provide a x509 certificate. This means the
> client will have to acquire a certificate from the CA before
> they are permitted to use the NBD server. This is still a
> fairly weak bar.
> 
> This adds a '--tls-acl ACL-ID' option to the qemu-nbd command
> which takes the ID of a previously added 'QAuthZ' object
> instance. This ACL will be used to validate the client's
> x509 distinguished name. Clients failing the ACL will not be
> permitted to use the NBD server.
> 
> For example to setup an ACL that only allows connection from
> a client whose x509 certificate distinguished name contains
> 'CN=fred', you would use:
> 
>   qemu-nbd -object tls-creds-x509,id=tls0,dir=/home/berrange/qemutls,\
>                    endpoint=server,verify-peer=yes \
>            -object authz-simple,id=acl0,policy=deny,\
> 	           rules.0.match=*CN=fred,rules.0.policy=allow \
>            -tls-creds tls0 \
>            -tls-acl acl0
> 	   ....other qemu-nbd args...

Ah, so you are arguing that this is feature-completion of work started
in 2.6, continuing work started before soft-freeze, and not a new
feature to be delayed to 2.7.

> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  qemu-nbd.c    | 13 ++++++++++++-
>  qemu-nbd.texi |  4 ++++
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 

> +++ b/qemu-nbd.texi
> @@ -86,6 +86,10 @@ the new style NBD protocol negotiation
>  Enable mandatory TLS encryption for the server by setting the ID
>  of the TLS credentials object previously created with the --object
>  option.
> +@item --tls-acl=ID
> +Specify the ID of a qauthz object previously created with the
> +--object option. This will be used to authorize users who
> +connect against their x509 distinguish name.

s/distinguish/distinguished/

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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