Is it possible to read SSO configuration summary via a custom command?(Written in Python using Splunk Lib) such as Trusted IP, Cookie set etc.
Can you not just read the $SPLUNK_HOME/etc/system/local/authentication.conf file with your python script? If not then look at using web services to read this file:
https://docs.splunk.com/Documentation/SplunkCloud/6.6.3/RESTTUT/RESTconfigurations