@Override
    public String getIdentifier() {
        return "ssl";
    }
Creates a new SSLAuthenticationProvider that authenticates users against
an external SSL termination system using SSL/TLS client authentication.
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-ssl/src/main/java/org/apache/guacamole/auth/ssl/SSLAuthenticationProvider.java