1 files changed, 8 insertions, 2 deletions
diff --git a/mu4web/user/pam.py b/mu4web/user/pam.py
index 55e868e..c641ff8 100644
--- a/mu4web/user/pam.py
+++ b/mu4web/user/pam.py
@@ -1,7 +1,13 @@
+"""User authentication through PAM."""
+
 from . import User
 import pam
 
 
 class PamUser(User):
-    def validate(self, password: str) -> bool:
-        return pam.authenticate(self._username, password)
+    """Authenticate user through pam."""
+
+    def validate(self, password: str) -> bool:  # noqa: 201
+        ret = pam.authenticate(self._username, password)
+        assert type(ret) == bool
+        return ret