glusterd: Authenticate management handshake requests

Management handshake requests, which are used to validate op-version
supported by the peers, are now only allowed if,
- the glusterd doesn't have any other peer, or
- the request was sent by another peer.

This prevents the op-version of a peer being changed because of a
connection attempt by an invalid peer.

Change-Id: I248c386ed5ec4f8360e7b5e7f9ab74b7e8a7fc65
BUG: 1109741
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/8126
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index 375e58e3e87..34d59e1d225 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -13944,3 +13944,17 @@ glusterd_check_client_op_version_support (char *volname, uint32_t op_version,
         }
         return 0;
 }
+
+gf_boolean_t
+glusterd_have_peers ()
+{
+        xlator_t        *this = NULL;
+        glusterd_conf_t *conf = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        return !list_empty (&conf->peers);
+}