Arnaud Michot

The Model Based Engineering approach is centred around the use of a model repository and a modelling tool. A drawback of the approach is that the evolution of derived documents or other artefacts requires to go back to the model. This process involves tracing the source element back in the model editor before triggering updates. This can reveal quite inefficient and even cause user rejection. This paper presents a reusable architecture including a back channel from a document to the related model. It efficiently supports the locate operation of model elements from the document, model updates from the document (including in-place text editing, e.g. to fix typos inside a description), and even concept creation from a text document. We also report on our experience in implementing this architecture in two modelling tools: the Objectiver goal-oriented requirements engineering tool and the Eclipse Modelling Framework, both with mainstream commercial and Open Source text processors.

This chapter describes an open source solution for securing the Claudia service manager and the OpenNebula virtual execution environment manager when combined in a federated RESERVOIR architecture. The security services provide confidentiality, authentication, and integrity by securing the external API. The chapter describes how to integrate the security solution in an open source cloud computing system, how to install it, and provides an illustrative case study showing its potential for the community. The aim of the chapter is to help those who want to build their own secure infrastructure clouds. The open source security code provides mutual authentication between clients and the Claudia service manager, and secures the SMI interface with role based access control. The same security services can also secure the VMI with role based access control and X509 certificates. Finally the federation can be secured by combining an LDAP server to manage the federation and XACML security policies, and using policy matching to guarantee the respect of security policies within the federation.

This chapter describes an open source solution for securing the Claudia service manager and the OpenNebula virtual execution environment manager when combined in a federated RESERVOIR architecture. The security services provide confidentiality, authentication, and integrity by securing the external API. The chapter describes how to integrate the security solution in an open source cloud computing system, how to install it, and provides an illustrative case study showing its potential for the community. The aim of the chapter is to help those who want to build their own secure infrastructure clouds. The open source security code provides mutual authentication between clients and the Claudia service manager, and secures the SMI interface with role based access control. The same security services can also secure the VMI with role based access control and X509 certificates. Finally the federation can be secured by combining an LDAP server to manage the federation and XACML security policies, and using policy matching to guarantee the respect of security policies within the federation.