Blocks untrusted apps to access /dev/socket/mdnsd from U

The untrusted apps should not directly access /dev/socket/mdnsd since
API level 34 (U). Only adbd and netd should remain to have access to
/dev/socket/mdnsd. For untrusted apps running with API level 33-, they
still have access to /dev/socket/mdnsd for backward compatibility.

Bug: 265364111
Test: Manual test
Change-Id: Id37998fcb9379fda6917782b0eaee29cd3c51525
diff --git a/private/untrusted_app_25.te b/private/untrusted_app_25.te
index 4235d7e..2c0391f 100644
--- a/private/untrusted_app_25.te
+++ b/private/untrusted_app_25.te
@@ -52,3 +52,10 @@
 # allow sending RTM_GETNEIGH{TBL} messages.
 allow untrusted_app_25 self:netlink_route_socket nlmsg_getneigh;
 auditallow untrusted_app_25 self:netlink_route_socket nlmsg_getneigh;
+
+# Connect to mdnsd via mdnsd socket.
+unix_socket_connect(untrusted_app_25, mdnsd, mdnsd)
+userdebug_or_eng(`
+  auditallow untrusted_app_25 mdnsd_socket:sock_file write;
+  auditallow untrusted_app_25 mdnsd:unix_stream_socket connectto;
+')