CBAC

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20260503（讨论 | 贡献）2026年8月31日 (一) 00:58的版本
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例1：基础policy，OASIS 规范正式例子的起点

来源：https://docs.oasis-open.org/xacml/3.0/xacml-3.0-core-spec-os-en.html#_Toc325047096

语法：单条 Policy + 单条 Rule，Policy 级 Target 为空，Rule 级 Target 用 rfc822Name-match 对请求里的 subject-id 做邮箱域匹配；没有 Condition、Obligation、PolicySet。相比 WSO2 的 string-equal/集合比较，这里第一次出现“带类型的函数语义”（RFC822 邮箱域名匹配）

原文：

<?xml version="1.0" encoding="UTF-8"?>
<Policy
  xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17
  http://docs.oasis-open.org/xacml/3.0/xacml-core-v3-schema-wd-17.xsd"
  PolicyId="urn:oasis:names:tc:xacml:3.0:example:SimplePolicy1"
  Version="1.0"
  RuleCombiningAlgId="identifier:rule-combining-algorithm:deny-overrides">
  <Description>
    Medi Corp access control policy
  </Description>
  <Target/>
  <Rule
    RuleId="urn:oasis:names:tc:xacml:3.0:example:SimpleRule1"
    Effect="Permit">
    <Description>
      Any subject with an e-mail name in the med.example.com domain
      can perform any action on any resource.
    </Description>
    <Target>
      <AnyOf>
        <AllOf>
          <Match
            MatchId="urn:oasis:names:tc:xacml:1.0:function:rfc822Name-match">
            <AttributeValue
              DataType="http://www.w3.org/2001/XMLSchema#string"
              >med.example.com</AttributeValue>
            <AttributeDesignator
              MustBePresent="false"
              Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject"
              AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id"
              DataType="urn:oasis:names:tc:xacml:1.0:data-type:rfc822Name"/>
          </Match>
        </AllOf>
      </AnyOf>
    </Target>
  </Rule>
</Policy>

逻辑结构：

Policy SimplePolicy1 (deny-overrides)

├── Target = 空（适用于所有请求）

└── Rule SimpleRule1 (Permit)

├── 描述：med.example.com 域内的邮箱主体可以对任意资源执行任意动作

└── Target: subject-id (rfc822Name) 匹配 "med.example.com"

属性表：

| `subject-id` | access-subject | `rfc822Name` |

原始请求等效json：

{ 

"sub": {
   "subjectId": "bart.simpson@med.example.com"
 },
 "obj": {
   "resourceId": "file://example/med/record/patient/BartSimpson"
 },
 "act": {
   "actionId": "read"
 }

}

转换版说明：

- 原例是单一企业内部访问策略，不是本课题“平台托管双合约”场景。为自圆其说，将其置于“Medi Corp 内部医疗资源平台”语境：

-- Platform 承担身份/角色管理、核心业务授权、安全合规、生命周期治理义务；

- 原 XACML 只有主体域约束，因此本文件只含一份 policy，不强行拆两份合约。

- 映射： rfc822Name-match("med.example.com", subject-id) -> subject.subjectId endsWith "@med.example.com"

- 原始请求之外需要获取的其它信息：

转换版：

policySet "OASIS3_5_MediCorpAccess" {

    // CBAC 追加：请求模型（判决引擎统一输入）

    request AuthorizationRequest {

        subject: Subject

        resource: Resource

        action: Action

        environment: Environment

    }

    combine denyOverrides         //    XACML 上层组合逻辑

    policy "MediCorpInternalAccess" signedBy [Subject, Platform] {

        party Subject {         // SPESC 原生参与方 ----

            subjectId: rfc822Name

            name: String

            department: String

            employmentStatus: String

        }

        party Platform { // Platform 的“系统设计义务”，由 SPESC term 声明。

            account: String

            authorize(role: String, subjectId: String)   // 身份/角色管理

            audit(actionId: String, subjectId: String)   // 安全/合规执行

            suspend(subjectId: String)                   // 治理/处罚

            revoke(subjectId: String)                    // 生命周期终止

        }

        // ---- SPESC 原生：资产 ----

        asset Resource {

            info {

                resourceId: String

                resourceType: String

                department: String

            }

            right { }

        }

        // ---- SPESC term：法律/义务声明（不参与 Permit/Deny）---

        // 身份与角色管理：平台有义务为域内用户派生 internal-user 角色

        term IdentityRoleManagement: Platform must authorize("internal-user", Subject::subjectId)

            when Subject::subjectId endsWith "@med.example.com".

        // 安全与合规执行：平台有义务对访问动作审计

        term SecurityComplianceAudit: Platform must audit(action.actionId, Subject::subjectId)

            when action.actionId in ["read", "download", "export"].

        // 生命周期治理：员工离岗时平台有义务吊销访问资格

        term LifecycleRevoke: Platform must revoke(Subject::subjectId)

            when Subject::employmentStatus = "terminated".

        combine permitOverrides //    XACML 下层组合逻辑

        access "AnyMedDomainUserAnyAction" {         // 原始 XACML 规则：域内用户可对任何资源执行任何动作

            target {

                subject.subjectId endsWith "@med.example.com"

            }

            effect Permit

        }

        signature { algorithm "ECDSA"; keyId "medi-subject-template-001"; digest "sha256:..." }

        signature { algorithm "ECDSA"; keyId "medi-platform-001"; digest "sha256:..." }

    }

}



例2：rbac组合

来源：https://docs.oasis-open.org/xacml/3.0/xacml-3.0-core-spec-os-en.html#_Toc325047096 语法：单条 Policy + 单条 Rule，Policy 级 Target 为空，Rule 级 Target 用 rfc822Name-match 对请求里的 subject-id 做邮箱域匹配；没有 Condition、Obligation、PolicySet。相比 WSO2 的 string-equal/集合比较，这里第一次出现“带类型的函数语义”（RFC822 邮箱域名匹配）

原文：

<Policy xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" PolicyId="testOr" RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:first-applicable" Version="1.0">
   <Description>Test Or</Description>
   <Target></Target>
   <Rule Effect="Permit" RuleId="primary-group-emps-rule">  //Rule1：read + 组命中 admin_emps/admin → 保护接口
      <Target>
         <AnyOf>
            <AllOf>
               <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
                  <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"/>
               </Match>
            </AllOf>
         </AnyOf>
      </Target>
      <Condition>
         <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
            <AttributeDesignator AttributeId="group" DataType="http://www.w3.org/2001/XMLSchema#string" Category="urn:oasis:names:tc:xacml:3.0:group" MustBePresent="true"/>
            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">admin_emps</AttributeValue>
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">admin</AttributeValue>
            </Apply>
         </Apply>
      </Condition>
   </Rule>
   <Rule Effect="Permit" RuleId="primary-user-rule">  //Rule2：公开版本接口，任何用户
      <Condition>
         <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
            <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"/>
            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">http://localhost:8280/services/Customers/getVersion1</AttributeValue>
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">http://localhost:8280/services/Customers/getVersion2</AttributeValue>
            </Apply>
         </Apply>
      </Condition>
   </Rule>
   <Rule Effect="Deny" RuleId="deny-rule"></Rule>
</Policy>

逻辑结构：

Policy (组合: first-applicable)

├── Target = 空

├── Rule1 (Permit)

│ ├── Target: action-id = read

│ └── Condition: group 属性 (类别 group)与 {admin_emps, admin} 有交集

├── Rule2 (Permit)

│ ├── Target: 无

│ └── Condition: resource-id 与 {http://localhost:8280/services/Customers/getVersion1, http://localhost:8280/services/Customers/getVersion2} 有交集

└── Rule3 (Deny) 兜底

属性表：

| `action-id` | `action` | string |

| `group` | `group` | string |

| `resource-id` | `resource` | string |

原始请求等效json：

{ 

 "sub": {
   "subjectId": "alice",
   "groups": ["admin"]
 },
 "obj": {
   "resourceId": "http://localhost:8280/services/Customers/getVersion1"
 },
 "act": {
   "actionId": "read"
 }

}

转换版说明：

把原策略的 3 条 Rule 直接翻成 3 条 access，没有加任何 Platform 义务

转换版：

policySet "WSO2_Sample6_TestOr" { 

   request AuthorizationRequest {
       subject: Subject
       resource: Resource
       action: Action
       environment: Environment
   }
   type Action {
       actionId: string
   }
   type Environment {
       currentTime: dateTime
   }
   combine firstApplicable
   policy "testOr" {
       party Subject {
           subjectId: string
           groups: string[]              // 原 XACML 的 group category
           readResource()                // 动作声明
       }
       asset Resource {
           info {
               resourceId: string
           }
           right { }
       }
       term PublicVersionRead: Subject can readResource
           when Resource::resourceId in [
               "http://localhost:8280/services/Customers/getVersion1",
               "http://localhost:8280/services/Customers/getVersion2"
           ].
       combine firstApplicable
       access "PrimaryGroupEmpsRule" {
           target {
               action.actionId = "read"
           }
           condition {
               some g in subject.groups
                   such that g in ["admin_emps", "admin"]
           }
           effect Permit
       }
       access "PrimaryUserRule" {
           condition {
               resource.resourceId in [
                   "http://localhost:8280/services/Customers/getVersion1",
                   "http://localhost:8280/services/Customers/getVersion2"
               ]
           }
           effect Permit
       }
       access "DenyRule" {
           effect Deny
       }
   }

}

取自“https://www.smartlegalcontract.cn/mediawiki/index.php?title=CBAC&oldid=538”