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qemu-nbd: add support for authorization of TLS clients

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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>
This commit is contained in:
Daniel P. Berrange 2019-02-27 16:20:33 +00:00 • committed by Eric Blake
parent c557a8c7b7
commit b25e12daff
6 changed files with 73 additions and 12 deletions
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11
tests/qemu-iotests/233.out
View file

@ -6,6 +6,7 @@ Generating a self signed certificate...
Generating a signed certificate...
Generating a signed certificate...
Generating a signed certificate...
Generating a signed certificate...
== preparing image ==
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
@ -29,6 +30,10 @@ image: nbd://127.0.0.1:PORT
file format: nbd
virtual size: 64M (67108864 bytes)
disk size: unavailable
image: nbd://127.0.0.1:PORT
file format: nbd
virtual size: 64M (67108864 bytes)
disk size: unavailable
exports available: 1
export: ''
size: 67108864
@ -51,7 +56,13 @@ wrote 1048576/1048576 bytes at offset 1048576
read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== check TLS with authorization ==
qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=10809,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=10809,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
== final server log ==
qemu-nbd: option negotiation failed: Verify failed: No certificate was found.
qemu-nbd: option negotiation failed: Verify failed: No certificate was found.
qemu-nbd: option negotiation failed: TLS x509 authz check for CN=localhost,O=Cthulhu Dark Lord Enterprises client1,L=R'lyeh,C=South Pacific is denied
qemu-nbd: option negotiation failed: TLS x509 authz check for CN=localhost,O=Cthulhu Dark Lord Enterprises client3,L=R'lyeh,C=South Pacific is denied
*** done