To integrate Duo with LDAP Group mapping in OpenVPN Access Server, create a single Python script with functions for Duo authentication and LDAP group lookup. In the main
DMV AZ function, perform Duo authentication. If successful, retrieve group memberships from LDAP and determine access based on the results. Integrate the script with OpenVPN's post-authentication script field. Securely store credentials, implement robust error handling, and thoroughly test the script.