dom0/core: verify VM name for not-allowed characters (#656)

dom0/qvm-core/qubes.py

@@ -315,6 +315,9 @@ class QubesVm(object):
         assert self.__qid < qubes_max_qid, "VM id out of bounds!"
         assert self.name is not None
 
+        if not self.verify_name(self.name):
+            raise QubesException("Invalid characters in VM name")
+
         if self.netvm is not None:
             self.netvm.connected_vms[self.qid] = self
 
@@ -482,6 +485,9 @@ class QubesVm(object):
         else:
             return False
 
+    def verify_name(self, name):
+        return re.match(r"^[a-zA-Z0-9-]*$", name) is not None
+
     def pre_rename(self, new_name):
         pass
 
@@ -489,6 +495,9 @@ class QubesVm(object):
         if self.is_running():
             raise QubesException("Cannot change name of running VM!")
 
+        if not self.verify_name(name):
+            raise QubesException("Invalid characters in VM name")
+
         self.pre_rename(name)
 
         new_conf = "%s/%s.conf" % (self.dir_path, name)