selinux: allow dpdkvhostuserclient sockets with newer libvirt

Newer libvirt and openstack versions will now label the unix socket as
an `svirt_tmpfs_t` object.  This means that in order to support
deploying with the recommended configuration (using a
dpdkvhostuserclient socket), additional permissions need to be
installed as part of the selinux policy.

An example of some of the AVC violations:

    type=AVC msg=audit(1518752799.102:978): avc:  denied  { write }
    for  pid=14368 comm="ovs-vswitchd" name="vhost0" dev="dm-0" ino=94
    scontext=system_u:system_r:openvswitch_t:s0
    tcontext=system_u:object_r:svirt_tmp_t:s0 tclass=sock_file

    type=AVC msg=audit(1518816172.126:1318): avc:  denied  { connectto }
    for  pid=32717 comm="ovs-vswitchd" path="/tmp/vhost0"
    scontext=system_u:system_r:openvswitch_t:s0
    tcontext=system_u:system_r:svirt_t:s0:c106,c530
    tclass=unix_stream_socket

Signed-off-by: Aaron Conole <[email protected]>
Acked-by: Ansis Atteka <[email protected]>

selinux/openvswitch-custom.te.in

@@ -14,6 +14,7 @@ require {
         type hugetlbfs_t;
         type kernel_t;
         type svirt_image_t;
+        type svirt_tmpfs_t;
         type vfio_device_t;
 @end_dpdk@
 
@@ -26,6 +27,7 @@ require {
         class unix_stream_socket { write getattr read connectto connect setopt getopt sendto accept bind recvfrom acceptfrom };
 
 @begin_dpdk@
+        class sock_file { read write append getattr open };
         class tun_socket { relabelfrom relabelto create };
 @end_dpdk@
 }
@@ -50,5 +52,8 @@ allow openvswitch_t hugetlbfs_t:file { create unlink };
 allow openvswitch_t kernel_t:unix_stream_socket { write getattr read connectto connect setopt getopt sendto accept bind recvfrom acceptfrom };
 allow openvswitch_t self:tun_socket { relabelfrom relabelto create };
 allow openvswitch_t svirt_image_t:file { getattr read write };
+allow openvswitch_t svirt_tmpfs_t:file { read write };
+allow openvswitch_t svirt_tmpfs_t:sock_file { read write append getattr open };
+allow openvswitch_t svirt_t:unix_stream_socket { connectto read write getattr sendto recvfrom setopt };
 allow openvswitch_t vfio_device_t:chr_file { read write open ioctl getattr };
 @end_dpdk@