Question

首先我想提一下这肯定是一个新手问题，但我现在正在寻找几个小时，我没有答案。

我刚开始尝试XACML用于学术目的。我使用wso2-is提供的编辑器来编写一些策略并根据某些请求对它们进行评估。

我创建此政策是为了表示主题你可以读取或写入来自资源 d

     <Policy xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" PolicyId="test-bis" RuleCombiningAlgId="urn:oasis:names:tc:xacml:3.0:rule-combining-algorithm:deny-overrides" Version="1.0">
   <Target/>
   <Rule Effect="Permit" RuleId="read-or-write">
      <Target>
         <AnyOf>
            <AllOf>
               <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">d</AttributeValue>
                  <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
               </Match>
            </AllOf>
         </AnyOf>
      </Target>
      <Condition>
         <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:and">
            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
               <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">write</AttributeValue>
               </Apply>
               <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
            </Apply>
            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:any-of">
               <Function FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-equal"/>
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">u</AttributeValue>
               <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
            </Apply>
         </Apply>
      </Condition>
   </Rule>
   <Rule Effect="Deny" RuleId="deny"/>
</Policy>

匹配此简单请求＆＃34;可以你读 d ＆＃34;我不适用于结果！这是请求：

 <Request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" CombinedDecision="false" ReturnPolicyIdList="false">
<Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
<Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="false">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
</Attribute>
</Attributes>
<Attributes Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
<Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" IncludeInResult="false">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">u</AttributeValue>
</Attribute>
</Attributes>
<Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource">
<Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" IncludeInResult="false">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">d</AttributeValue>
</Attribute>
</Attributes>
</Request>

任何人都可以帮助我理解我做错了什么？

谢谢大家！

Answer 1

我测试了您在Axiomatics Policy Server发送的政策和请求（免责声明：我为Axiomatics工作）。答案应该是Deny。两条规则都触发了您将策略中的规则与deny-overrides组合算法合并，这意味着Deny胜过Permit。

您可以在下面看到APS中策略模拟的屏幕截图，其中显示了触发规则和第二条规则赢得第一条规则。

Simulation trace in the Axiomatics Policy Administration Point

如果您对更好地理解组合算法感兴趣，请参阅＆＃34;真值表＆＃34; deny-overrides：

enter image description here

Answer 2

当你得到＆＃34;不适用＆＃34;您的策略似乎未在WSO2 IS中启用或未升级到PDP进行测试。只需检查策略是否已启用并提升为PDP进行测试。您也可以在不升级到PDP的情况下测试策略，但在这两种情况下都应该处于启用模式。

我在WSo2 IS 4.0.0中尝试了你的策略，并且给出了＃34; Deny＆＃34;。是的，正如大卫提到的那样，因为你的策略组合算法是＆＃34; deny-overrides＆＃34;这总是得到＆＃34;拒绝＆＃34;根据您的默认规则如下：

<Rule Effect="Deny" RuleId="deny"/>

因此，您需要将策略组合算法作为＆＃34; permit-overrides＆＃34;或删除最后一条规则。

Answer 3

Yuor请求很好，这是您要求的政策。

<Policy xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" PolicyId="9f654de2-06d3-45c9-bb7f-947c9a9b247a" RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:first-applicable" Version="1.0">
<Target>
<AnyOf>
<AllOf>
<Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">d</AttributeValue>
<AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:root-resource-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
</Match>
</AllOf>
</AnyOf>
</Target>
<Rule Effect="Permit" RuleId="Rule_write">
<Condition>
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:and">
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">write</AttributeValue>
</Apply>
<AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
</Apply>
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">u</AttributeValue>
</Apply>
<AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
</Apply>
</Apply>
</Condition>
</Rule>
<Rule Effect="Permit" RuleId="Rule_read">
<Condition>
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:and">
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue></Apply>
<AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
</Apply><Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
<Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
<AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">u</AttributeValue></Apply>
<AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"/>
</Apply>
</Apply>
</Condition>
</Rule>
<Rule Effect="Deny" RuleId="Rule_Deny_All"/>
</Policy>

XACML政策和请求

3 个答案: