Does anyone know if there is documentation outlining security guidelines regarding the secure implementation of Splunk Enterprise?
Here's a good guide on how to install Splunk securely.. This will show you how to configure role-based access control, authentication LDAP, Single Sign On with SAML, configuring SSL, and installing Splunk Enterprise securely.
http://docs.splunk.com/Documentation/Splunk/6.4.2/Security/InstallSplunksecurely