Identity Federation with VOMS in Cloud Infrastructures

The cloud computing model is gaining interest in the scientific computing field after being well established and promoted in the non-academic world. Scientific data centers are starting to promote and deploy cloud services for their users, creating an heterogeneous ecosystem with different resource providers and different software stacks, that are neither designed nor adapted to interoperate or cooperate. We propose the use of the Virtual Organization Membership Service (VOMS), a well proven technology in the Grid area, to provide identity federation across different providers. In this work we also present an implementation of VOMS authentication in Open Stack.