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[Qemu-devel] [PATCH v1 07/10] qemu-nbd: add support for ACLs for TLS cli
From: |
Daniel P. Berrange |
Subject: |
[Qemu-devel] [PATCH v1 07/10] qemu-nbd: add support for ACLs for TLS clients |
Date: |
Fri, 19 Feb 2016 16:47:40 +0000 |
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...
Signed-off-by: Daniel P. Berrange <address@hidden>
---
qemu-nbd.c | 13 ++++++++++++-
qemu-nbd.texi | 4 ++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 933ca4a..4f202f3 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -43,6 +43,7 @@
#define QEMU_NBD_OPT_DETECT_ZEROES 4
#define QEMU_NBD_OPT_OBJECT 5
#define QEMU_NBD_OPT_TLSCREDS 6
+#define QEMU_NBD_OPT_TLSACL 7
static NBDExport *exp;
static bool newproto;
@@ -56,6 +57,7 @@ static int nb_fds;
static QIOChannelSocket *server_ioc;
static int server_watch = -1;
static QCryptoTLSCreds *tlscreds;
+static const char *tlsacl;
static void usage(const char *name)
{
@@ -344,7 +346,7 @@ static gboolean nbd_accept(QIOChannel *ioc, GIOCondition
cond, gpointer opaque)
nb_fds++;
nbd_update_server_watch();
nbd_client_new(newproto ? NULL : exp, cioc,
- tlscreds, NULL, nbd_client_closed);
+ tlscreds, tlsacl, nbd_client_closed);
object_unref(OBJECT(cioc));
return TRUE;
@@ -475,6 +477,7 @@ int main(int argc, char **argv)
{ "object", 1, NULL, QEMU_NBD_OPT_OBJECT },
{ "export-name", 1, NULL, 'x' },
{ "tls-creds", 1, NULL, QEMU_NBD_OPT_TLSCREDS },
+ { "tls-acl", 1, NULL, QEMU_NBD_OPT_TLSACL },
{ NULL, 0, NULL, 0 }
};
int ch;
@@ -672,6 +675,9 @@ int main(int argc, char **argv)
case QEMU_NBD_OPT_TLSCREDS:
tlscredsid = optarg;
break;
+ case QEMU_NBD_OPT_TLSACL:
+ tlsacl = optarg;
+ break;
}
}
@@ -708,6 +714,11 @@ int main(int argc, char **argv)
error_get_pretty(local_err));
exit(EXIT_FAILURE);
}
+ } else {
+ if (tlsacl) {
+ error_report("--tls-acl is not permitted without --tls-creds");
+ exit(EXIT_FAILURE);
+ }
}
if (disconnect) {
diff --git a/qemu-nbd.texi b/qemu-nbd.texi
index 227a73c..935d0d3 100644
--- a/qemu-nbd.texi
+++ b/qemu-nbd.texi
@@ -81,6 +81,10 @@ 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.
address@hidden --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.
@item -v, --verbose
Display extra debugging information
@item -h, --help
--
2.5.0
- [Qemu-devel] [PATCH v1 00/10] Provide a QOM-based authorization API, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 01/10] qdict: implement a qdict_crumple method for un-flattening a dict, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 02/10] qapi: allow QmpInputVisitor to auto-cast types, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 04/10] util: add QAuthZ object as an authorization base class, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 03/10] qom: support arbitrary non-scalar properties with -object, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 07/10] qemu-nbd: add support for ACLs for TLS clients,
Daniel P. Berrange <=
- [Qemu-devel] [PATCH v1 06/10] acl: delete existing ACL implementation, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 08/10] nbd: allow an ACL to be set with nbd-server-start QMP command, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 09/10] chardev: add support for ACLs for TLS clients, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 05/10] util: add QAuthZSimple object type for a simple access control list, Daniel P. Berrange, 2016/02/19
- [Qemu-devel] [PATCH v1 10/10] vnc: allow specifying a custom ACL object name, Daniel P. Berrange, 2016/02/19