Cloud service authentication

Providing access to a cloud service includes a system receiving an application request to access a cloud service. In response, the system sends an identity provider (IP) a token request, comprising an application identifier (ID), an operating system (OS) cloud credential associated with login credentials of a user of an OS hosting the application, and a cloud service ID of the cloud service. Based on sending the token request, and on the IP authenticating the user and verifying the application ID is valid, the system receives a token from the IP. The token, which is signed with an IP signature, comprises the cloud service ID, the application ID, and a user assigned ID associated with the cloud service. The system provides the token to the application for submission to a cloud service provider for access, and obtains cloud service access based on the cloud service provider validating the IP signature.