Icarus Class: User
name Attribute may stay unnamed in attribute list. 
  The user/group name
addr Attribute is multivalued (list).  
  IP address of client. Can start at every level.
names Attribute is multivalued (list).  
  The user names of allowed users - received from REMOTE_USER
hasAccessTo  
  The user/group name
hasNotAccessTo  
  The user/group name