Cross domain resource access includes accessing resources in a first domain from a second domain. This may be performed using the methods, system, and devices described herein. This may include maintaining a mapping identifier for a user of a service provider based on user information. The service provider may provide first and second security domains for the user. The mapping identifier may be associated with an endpoint of a private cloud computing service of the first security domain. The may also include receiving, from the first security domain, a request associated with a resource of the second security domain, the request comprising the mapping identifier. This may also include routing the request from the first security domain to the second domain via a first private network link of the first security domain and a second private network link of the second security domain using a confidentiality controlled interface.