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Over the past years several works have proposed access control models for XMLdata where only read-access rights over non-recursive DTDs are considered. Afew amount of works have studied the access rights for updates. In this paper,we present a general model for specifying access control on XML data in thepresence of update operations of W3C XQuery Update Facility. Our approach forenforcing such updates specifications is based on the notion of query rewritingwhere each update operation defined over arbitrary DTD (recursive or not) isrewritten to a safe one in order to be evaluated only over XML data which canbe updated by the user. We investigate in the second part of this report thesecure of XML updating in the presence of read-access rights specified by asecurity views. For an XML document, a security view represents for each classof users all and only the parts of the document these users are able to see. Weshow that an update operation defined over a security view can cause disclosureof sensitive data hidden by this view if it is not thoroughly rewritten withrespect to both read and update access rights. Finally, we propose a securityview based approach for securely updating XML in order to preserve theconfidentiality and integrity of XML data.

A General Approach for Securely Querying and Updating XML Data