Add log message when blacklisting users

authserv/app_common.py

@@ -92,7 +92,8 @@ def _do_auth(mc, username, service, shard, password, otp_token, source_ip,
 
     if retval != protocol.OK and current_app.config.get('ENABLE_BLACKLIST'):
         if user:
-            bl.auth_failure('u', username)
+            if bl.auth_failure('u', username):
+                current_app.logger.info('blacklisted user %s', username)
         if (source_ip
             and not whitelisted(source_ip, current_app.config.get('SOURCE_IP_WHITELIST'))):
             if bl.auth_failure('ip', source_ip):