At the root of all XACML policies is a Policy or a PolicySet. A . A Policy represents a single access control policy, expressed through a set of rules. A PolicySet is a container that can hold other Policies or PolicySets, as well as references to policies found in remote locations. A Policy represents a single access control policy, expressed through a set of Rules. Each XACML policy document contains exactly one Policy or PolicySet root XML tag. Because a Policy or PolicySet may contain multiple policies or Rules, each of which may evaluate to different access control decisions, XACML needs some way of reconciling the decisions each makes. This is done through a collection of Combining Algorithms. Each algorithm represents a different way of combining multiple decisions into a single decision.
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- Sign in. Enter your username and password to log on in to the Management Console.
- Navigate to the Main menu to access the Entitlement menu. Click Policy Administration under PAP.
- Click Add New Entitlement Policy.
The Add New Policy page appears. In current WSO2 Identity Server, there is 6 ways of wiring an XACML 3.0 policy. You can select one out of six methods to create the policy.
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Simple Policy Editor
- This simple editor provides you the opportunity to create XACML 3.0 policies without any knowledge of XACML policy language. You can define your rules in a simpler manner and create an XACML 3.0 policy out of them. However, you need to have some knowledge about access control rules.
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You can click on “finish” and and finish policy creation.
Standard Policy Editor
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There are Policy Combining Algorithms which are used by Policy Sets and Rule Combining Algorithms which are used by Policies. Each of the algorithms mentioned below has its Policy Combining algorithm and its Rule Combining algorithms as follows:
These algorithms are explained in detail as follows,
This combining algorithm combines decisions in such a way that if any decision is a Permit, then that decision wins. The permit overrides combining algorithm can be interesting when: At least one child must return a Permit for access to be granted overall regardless of restrictions. One wants to return all the reasons why access is being denied. This is what one could call a “greedy deny overrides”.Forinstanceifthe reason for not being able to view a resource is that(a) you are not the owner and (b) you are in the wrong department, then we could rework the previous example as follows. When any of the deny reason triggers, the response wouldbe denywith all the applicable reasons for access being denied:
This combining algorithm exists only for policy sets to combine policy sets and policies. It cannot be used to combine rules. With this combining algorithm, in order for either of a Permit or Deny to be returned, then only one of the children must produce a valid decision – whether Deny or Permit.
The ordered combining algorithms combine decisions in the same way as their (unordered) cousins. In, addition they bring the guarantee that policies, policy sets, and rules are considered in the order in which they are defined. The need to define an ordered combining algorithm stems from the fact the XACML specification does not specify whether order matters in the deny-overrides and permit-overrides combining algorithms. |
Policy Set Editor
When you want to create a set of policies to evaluate at one time, you can create a Policy Set. You can add policies as shown in the figure and Click "Finish" to create the policy set.
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Click Choose File and browse to the location of thepolicyin your local machine. |
Write Policy in XML
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Create your own policy in XML. |
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