diff --git a/auth.py b/auth.py
index 42a5f4c70e28b90627b22520d811699efcf18032..e24f82015f518a37b7f392823373535e5a874ef2 100644
--- a/auth.py
+++ b/auth.py
@@ -6,25 +6,28 @@ from ldap3.utils.dn import parse_dn
 from datetime import datetime
 
 class User:
-    def __init__(self, username, groups, timestamp=None):
+    def __init__(self, username, groups, timestamp=None, obsolete=False):
         self.username = username
         self.groups = groups
         if timestamp is not None:
             self.timestamp = timestamp
         else:
             self.timestamp = datetime.now()
+        self.obsolete = obsolete
 
     def summarize(self):
-        return "{}:{}:{}".format(self.username, ",".join(self.groups), str(self.timestamp.timestamp()))
+        return "{}:{}:{}:{}".format(self.username, ",".join(self.groups), str(self.timestamp.timestamp()), self.obsolete)
 
     @staticmethod
     def from_summary(summary):
-        parts = summary.split(":", 2)
-        if len(parts) != 3:
+        parts = summary.split(":", 3)
+        if len(parts) != 4:
             return None
-        name, groupstring, timestamp = parts
-        groups = groupstring.split(",")
-        return User(name, groups, datetime.fromtimestamp(float(timestamp)))
+        name, group_str, timestamp_str, obsolete_str = parts
+        timestamp = datetime.fromtimestamp(float(timestamp_str))
+        obsolete = obsolete_str == "True"
+        groups = group_str.split(",")
+        return User(name, groups, timestamp, obsolete)
 
     @staticmethod
     def from_hashstring(secure_string):
@@ -39,45 +42,20 @@ class UserManager:
         for backend in self.backends:
             if backend.authenticate(username, password):
                 groups = backend.groups(username, password)
-                return User(username, groups)
+                return User(username, groups, obsolete=backend.obsolete)
         return None
 
     def all_groups(self):
         for backend in self.backends:
             yield from backend.all_groups()
 
-class LegacyLdapManager:
-    def __init__(self, url, base):
-        self.connection = ldap.initialize(url)
-        self.base = base
-
-    def login(self, username, password):
-        if not self.authenticate(username, password):
-            return None
-        groups = list(map(lambda g: g.decode("utf-8"), self.groups(username)))
-        return User(username, groups)
-
-    def authenticate(self, username, password):
-        try:
-            self.connection.simple_bind_s("uid={},ou=users,{}".format(username, self.base), password)
-            return True
-        except ldap.INVALID_CREDENTIALS:
-            return False
-        return False
-
-    def groups(self, username, password=None):
-        result = []
-        # use username.lower() since memberUid is case sensitive here
-        for _, result_dict in self.connection.search_s(self.base, ldap.SCOPE_SUBTREE, "(memberUid={})".format(username.lower()), ["cn"]):
-            result.append(result_dict["cn"][0])
-        return result
-
 
 class LdapManager:
-    def __init__(self, host, user_dn, group_dn, port=636, use_ssl=True):
+    def __init__(self, host, user_dn, group_dn, port=636, use_ssl=True, obsolete=False):
         self.server = ldap3.Server(host, port=port, use_ssl=use_ssl)
         self.user_dn = user_dn
         self.group_dn = group_dn
+        self.obsolete = obsolete
 
     def authenticate(self, username, password):
         connection = ldap3.Connection(self.server, self.user_dn.format(username), password)
@@ -99,9 +77,10 @@ class LdapManager:
         for group in group_reader.search():
             yield group.cn.value
 
+
 class ADManager:
     def __init__(self, host, domain, user_dn, group_dn,
-        port=636, use_ssl=True, ca_cert=None):
+        port=636, use_ssl=True, ca_cert=None, obsolete=False):
         tls_config = ldap3.Tls(validate=ssl.CERT_REQUIRED)
         if ca_cert is not None:
             tls_config = ldap3.Tls(validate=ssl.CERT_REQUIRED,
@@ -111,6 +90,7 @@ class ADManager:
         self.domain = domain
         self.user_dn = user_dn
         self.group_dn = group_dn
+        self.obsolete = obsolete
 
     def prepare_connection(self, username=None, password=None):
         if username is not None and password is not None: