SGD is designed to integrate with your existing authentication infrastructure and has the following methods for authenticating users:
System authentication. SGD checks the user’s credentials against one or more external authentication services, for example a Lightweight Directory Access Protocol (LDAP) directory.
Third-party authentication. An external mechanism authenticates the user and SGD trusts that the authentication is correct. The most common use of third-party authentication is web server authentication.
See Section 4.1, “Authenticating Users” for more details about the authentication mechanisms supported by SGD.