relay: set mode 700 on the unix socket file (only the owner can use it)

src/plugins/relay/relay-server.c

@@ -26,6 +26,7 @@
 #include <time.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -646,6 +647,10 @@ relay_server_create_socket (struct t_relay_server *server)
         return 0;
     }
 
+    /* change permissions: only the owner can use the unix socket */
+    if (server->unix_socket)
+        chmod (server->path, 0700);
+
 #ifdef SOMAXCONN
     if (listen (server->sock, SOMAXCONN) != 0)
 #else