Splunk offers a lot of freedom in RBAC configuration which can lead to very complex and unwieldy policies.
Start by carefully considering your users and the reasonable distinctions between them!
If your environment has a small number of users that fit into distinct categories, you will want a different solution than if you have many users with blurry team boundaries.
Start with your authentication. Are you using local users? LDAP? SAML?
Each of these will provide a mechanism for user login. LDAP and SAML groups can be mapped to Splunk Roles, which are collections of permissions. Local login users can aso be fiven
