Index: ldapdb/models/query.py
===================================================================
--- ldapdb/models/query.py	(revision 849)
+++ ldapdb/models/query.py	(working copy)
@@ -53,6 +53,8 @@
             params = ["*%s" % escape_ldap_filter(value)]
         elif lookup_type == 'startswith':
             params = ["%s*" % escape_ldap_filter(value)]
+        elif lookup_type == 'contains':
+            params = ["*%s*" % escape_ldap_filter(value)]
         elif lookup_type == 'exact':
             params = [escape_ldap_filter(value)]
         elif lookup_type == 'in':
Index: ldapdb/tests.py
===================================================================
--- ldapdb/tests.py	(revision 849)
+++ ldapdb/tests.py	(working copy)
@@ -49,6 +49,10 @@
         where.add((Constraint("cn", "cn", None), 'in', ["foo", "bar"]), AND)
         self.assertEquals(where.as_sql(), "(|(cn=foo)(cn=bar))")
 
+        where = WhereNode()
+        where.add((Constraint("cn", "cn", None), 'contains', "test"), AND)
+        self.assertEquals(where.as_sql(), "(cn=*es*)")
+
     def test_escaped(self):
         where = WhereNode()
         where.add((Constraint("cn", "cn", None), 'exact', "(test)"), AND)