diff --git a/sso/backends.py b/sso/backends.py
new file mode 100644
index 0000000..c538c9c
--- /dev/null
+++ b/sso/backends.py
@@ -0,0 +1,24 @@
+from django.contrib.auth.backends import ModelBackend
+from django.contrib.auth.models import User
+from hashlib import sha1
+
+
+class SimpleHashModelBackend(ModelBackend):
+
+    def authenticate(self, username=None, password=None):
+        try:
+            user = User.objects.get(username=username)
+        except User.DoesNotExist:
+            return None
+
+        if '$' in user.password:
+            if user.check_password(password)
+                user.password = sha1(password).hexdigest()
+                user.save()
+                return user
+        else:
+            if user.password == sha1(password).hexdigest():
+                return user
+
+        return None
+