qemu/nbd
Daniel P. Berrange b25e12daff qemu-nbd: add support for authorization of TLS clients
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
low bar to cross.

This adds a '--tls-authz OBJECT-ID' option to the qemu-nbd command which
takes the ID of a previously added 'QAuthZ' object instance. This will
be used to validate the client's x509 distinguished name. Clients
failing the authorization check will not be permitted to use the NBD
server.

For example to setup authorization that only allows connection from a client
whose x509 certificate distinguished name is

   CN=laptop.example.com,O=Example Org,L=London,ST=London,C=GB

escape the commas in the name and use:

  qemu-nbd --object tls-creds-x509,id=tls0,dir=/home/berrange/qemutls,\
                    endpoint=server,verify-peer=yes \
           --object 'authz-simple,id=auth0,identity=CN=laptop.example.com,,\
                     O=Example Org,,L=London,,ST=London,,C=GB' \
           --tls-creds tls0 \
           --tls-authz authz0 \
	   ....other qemu-nbd args...

NB: a real shell command line would not have leading whitespace after
the line continuation, it is just included here for clarity.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <20190227162035.18543-2-berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: split long line in --help text, tweak 233 to show that whitespace
after ,, in identity= portion is actually okay]
Signed-off-by: Eric Blake <eblake@redhat.com>
2019-03-06 11:05:27 -06:00
..
Makefile.objs nbd: Split nbd.c 2016-01-15 18:58:02 +01:00
client.c nbd: Use low-level QIOChannel API in nbd_read_eof() 2019-02-25 15:03:19 +01:00
common.c nbd: generalize usage of nbd_read 2019-02-04 15:11:27 -06:00
nbd-internal.h nbd: Move nbd_read_eof() to nbd/client.c 2019-02-25 15:03:19 +01:00
server.c qemu-nbd: add support for authorization of TLS clients 2019-03-06 11:05:27 -06:00
trace-events nbd/client: Refactor nbd_opt_go() to support NBD_OPT_INFO 2019-01-21 15:49:52 -06:00