From 2102c1ef0ab7e1040f570cb1ed0e1e71fb72c734 Mon Sep 17 00:00:00 2001
From: Ryan Petrello <rpetrell@redhat.com>
Date: Wed, 1 Aug 2018 17:36:55 -0400
Subject: [PATCH] fix a bug in multi-LDAP authentication

see: https://github.com/ansible/tower/issues/2738
---
 awx/sso/backends.py | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/awx/sso/backends.py b/awx/sso/backends.py
index 93d7329d5f..0445c2302a 100644
--- a/awx/sso/backends.py
+++ b/awx/sso/backends.py
@@ -110,12 +110,13 @@ class LDAPBackend(BaseLDAPBackend):
             pass
         try:
             user = super(LDAPBackend, self).authenticate(username, password)
-            try:
-                user.ldap_user._get_groups().get_group_dns()
-            except ImproperlyConfigured:
-                logger.exception(_("Encountered an error populating user {} from LDAP").format(user.username))
-                user.delete()
-                raise
+            if user and getattr(user, 'ldap_user', None):
+                try:
+                    user.ldap_user._get_groups().get_group_dns()
+                except ImproperlyConfigured:
+                    logger.exception(_("Encountered an error populating user {} from LDAP").format(user.username))
+                    user.delete()
+                    raise
             return user
         except Exception:
             logger.exception("Encountered an error authenticating to LDAP")