This documentation is for WSO2 API Manager 2.0.0 View documentation for the latest release.
Page Comparison - Enabling Role-Based Access Control Using XACML (v.15 vs v.16) - API Manager 2.0.0 - WSO2 Documentation

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The API Manager acts as the policy enforcement point (PEP). Whenever an API invocation comes to the API Manager, an authorisation authorization request is sent to the PDP with the required attributes. In this case, it can be the name of the user, resource path and the HTTP verb. The PDP receives the request along with these attributes and evaluates the request against the existing policies deployed in the PDP. If the request requires more information, the PDP tries to obtain that information from a policy information point (PIP). In this case, the request from the API Manager can contain the username and the policy that is deployed requires the role of the user. In such a scenario, the PDP gets this information from the user store that is defined as a PIP. Once the PDP has the required information to evaluate the request, a response is sent back to the API Manager with its policy decision.

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