XACML 2.0 implementation for the NERC DataGrid
- XACML 2.0 implementation for CEDA (the Centre for Environmental Data Archival)
STFC, Rutherford Appleton Laboratory. This is follow on work from the NERC (Natural Environment Research Council) DataGrid 3 Project.
XACML (eXtensible Access Control Mark-up Language), is an XML based language for expressing access control policies.
Only the parts of the specification immediately required for CEDA have been implemented in this initial release: Policy Decision Point; Deny overrides and Permit overrides rule combining algorithms; AttributeDesignators; various function types: see ndg.xacml.core.functions; and attribute types: see ndg.xacml.core.attribute; incomplete support for <AttributeSelector>s, <VariableReference>, <VariableDefinition>. <Obligations>; includes an ElementTree based parser for Policies. No support for writing out policies or read/write of XML representation of <Request> and <Response>;
See ndg.xacml.test for unit tests and examples.
The software follows a modular structure to allow it to be extended easily to include new parsers, functions and attribute types
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