Add UUID syntax validation

main.py

@@ -7,6 +7,7 @@ import configparser
 import os
 import socket
 import sys
+import uuid as uuid_module
 from ipaddress import AddressValueError, IPv4Address, IPv6Address
 from os import access, R_OK
 
@@ -33,10 +34,17 @@ class CloudInitRequest:
         self.remoteip = None
         self.hostinfo = ('localhost', )
         self.request = request
-        self.uuid = uuid
         self.meta_data = None
         self.meta_data_loaded = False
         self.user_data = None
+
+        try:
+            self.uuid = str(uuid_module.UUID('{' + uuid + '}'))
+        # ValueError is wrong UUID syntax
+        # TypeError is None
+        except (ValueError, TypeError):
+            self.uuid = None
+
         self._init_ip()
         self._generate_default_meta_data()