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<button id=search-close title=取消搜索 type=reset aria-label=取消搜索><svg class="icon menu-close"><use xlink:href="/v1.12/img/icons.svg#menu-close"/></svg></button></form></nav></header><div class=banner-container></div><article class=post itemscope itemtype=http://schema.org/BlogPosting><div class=header-content><h1>基于 Istio 授权的 Micro-Segmentation</h1><p>描述 Istio 的授权功能以及如何在各种用例中使用它。</p></div><p class=post-author>Jul 20, 2018 <span>|</span> By Limin Wang</p><div><p>Micro-Segmentation 是一种安全技术,可在云部署中创建安全区域,并允许各组织将工作负载彼此隔离以单独保护它们。
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<a href=/v1.12/zh/docs/concepts/security/#authorization>Istio 的授权功能</a>也称为 Istio 基于角色的访问控制,为 Istio 网格中的服务提供
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Micro-Segmentation。它的特点是:</p><ul><li>不同粒度级别的授权,包括命名空间级别、服务级别和方法级别。</li><li>服务间和最终用户到服务授权。</li><li>高性能,因为它在 Envoy 上本地执行。</li><li>基于角色的语义,使其易于使用。</li><li>灵活性高,因为它允许用户使用<a href=/v1.12/zh/docs/reference/config/security/constraints-and-properties>组合属性</a>定义条件。</li></ul><p>在这篇博客文章中,您将了解主要授权功能以及如何在不同情况下使用它们。</p><h2 id=characteristics>特点</h2><h3 id=RPC-level-authorization>RPC 级别授权</h3><p>授权在各个 RPC 级别执行。具体来说,它控制“谁可以访问我的 <code>bookstore</code> 服务”,或者“谁可以在我的 <code>bookstore</code> 服务中访问
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<code>getBook</code> 方法 ”。它不是为了控制对于应用程序具体资源实例的访问而设计的,例如访问“存储桶 X ”或访问“第二层架上的第 3 本书”。目前这种应用特定的访问控制逻辑需要由应用程序本身处理。</p><h3 id=role-based-access-control-with-conditions>具有条件的基于角色的访问控制</h3><p>授权是<a href=https://en.wikipedia.org/wiki/Role-based_access_control>基于角色的访问控制(RBAC)</a> 系统,
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将此与<a href=https://en.wikipedia.org/wiki/Attribute-based_access_control>基于属性的访问控制(ABAC)</a> 系统对比。
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与 ABAC 相比,RBAC 具有以下优势:</p><ul><li><p><strong>角色允许对属性进行分组。</strong> 角色是权限组,用于指定允许的操作在系统上执行。用户根据组织内的角色进行分组。
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您可以针对不同的情况定义角色并重用他们。</p></li><li><p><strong>关于谁有权访问,更容易理解和推理。</strong> RBAC 概念自然地映射到业务概念。例如,数据库管理员可能拥有对数据库后端服务的所有访问权限,
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而 Web 客户端可能只能查看数据库后端服务前端服务。</p></li><li><p><strong>它减少了无意的错误。</strong> RBAC 策略使得复杂的安全更改变得更加容易。你不会有在多个位置重复配置,以后在需要进行更改时忘记更新其中一些配置。</p></li></ul><p>另一方面,Istio 的授权系统不是传统的 RBAC 系统。它还允许用户使用定义<strong>条件</strong><a href=/v1.12/zh/docs/reference/config/security/constraints-and-properties>属性组合</a>。这给了 Istio 表达复杂的访问控制策略的灵活性。实际上,<strong>Istio 授权采用“RBAC + 条件”模型,具有 RBAC 系统的所有优点,并支持通常是 ABAC 系统提供的灵活性。</strong>你会在下面看到一些<a href=#examples>示例</a>。</p><h3 id=high-performance>高性能</h3><p>由于其简单的语义,Istio 授权直接在 Envoy 本地执行。在运行时,授权决策完全在 Envoy 过滤器内部完成,不依赖于任何外部模块。
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这允许 Istio 授权实现高性能和可用性。</p><h3 id=work-with-without-primary-identities>使用/不使用主要标识</h3><p>与任何其他 RBAC 系统一样,Istio 授权具有身份识别功能。在 Istio 授权政策中,有一个主要的
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身份称为 <code>user</code>,代表客户的主体。</p><p>除主要标识外,您还可以自己定义标识。例如,您可以将客户端标识指定为“用户 <code>Alice</code> 从 <code>Bookstore</code> 前端服务调用”,在这种情况下,
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你有一个调用服务(<code>Bookstore frontend</code>)和最终用户(<code>Alice</code>)的组合身份。</p><p>要提高安全性,您应该启用<a href=/v1.12/zh/docs/concepts/security/#authentication>认证功能</a>, 并在授权策略中使用经过验证的身份。但是,
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使用授权不强迫一定要有身份验证。Istio 授权可以使用或不使用身份。如果您正在使用遗留系统,您可能没有网格的双向 TLS 或 JWT 身份验证
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设置。在这种情况下,识别客户端的唯一方法是,例如,通过 IP。您仍然可以使用 Istio 授权来控制允许哪些 IP 地址或 IP 范围访问您的服务。</p><h2 id=examples>示例</h2><p><a href=/v1.12/zh/docs/tasks/security/authorization/authz-http>授权任务</a>通过 <a href=/v1.12/zh/docs/examples/bookinfo>Bookinfo 应用</a>向您展示如何使用 Istio 的授权功能来控制命名空间级别
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和服务级别的访问。在本节中,您将看到更多使用 Istio 授权进行权限细分的示例。</p><h3 id=namespace-level-segmentation-via-rbac-conditions>通过 RBAC + 条件进行命名空间级别细分</h3><p>假设你在 <code>frontend</code> 和 <code>backend</code> 命名空间中有服务。您想要允许所有在 <code>frontend</code> 命名空间中的服务访问 <code>backend</code> 命名空间中标记
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为 <code>external</code> 的所有服务。</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>apiVersion: "rbac.istio.io/v1alpha1"
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kind: ServiceRole
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metadata:
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name: external-api-caller
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namespace: backend
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spec:
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rules:
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- services: ["*"]
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methods: ["*”]
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constraints:
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- key: "destination.labels[visibility]”
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values: ["external"]
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---
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apiVersion: "rbac.istio.io/v1alpha1"
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kind: ServiceRoleBinding
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metadata:
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name: external-api-caller
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namespace: backend
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spec:
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subjects:
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- properties:
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source.namespace: "frontend”
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roleRef:
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kind: ServiceRole
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name: "external-api-caller"
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</code></pre><p>上面的 <code>ServiceRole</code> 和 <code>ServiceRoleBinding</code> 表示“允许<em>谁</em> 在 <em>什么条件</em> (RBAC + 条件)下执行<em>什么</em> ”。其中:</p><ul><li><strong>“谁”</strong> 是 <code>frontend</code> 命名空间中的服务。</li><li><strong>“什么”</strong> 是在 <code>backend</code> 命名空间中调用服务。</li><li><strong>“条件”</strong> 是具有值 <code>external</code> 的目标服务的 <code>visibility</code> 标签。</li></ul><h3 id=service-method-level-isolation-with-without-primary-identities>具有/不具有主要身份的服务/方法级别隔离</h3><p>这是演示另一个服务/方法级别的细粒度访问控制的示例。第一步是定义一个 <code>book-reader</code> <code>ServiceRole</code>,它允许对 <code>bookstore</code> 服务中的 <code>/books/*</code> 资源进行 READ 访问。</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>apiVersion: "rbac.istio.io/v1alpha1"
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kind: ServiceRole
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metadata:
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name: book-reader
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namespace: default
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spec:
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rules:
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- services: ["bookstore.default.svc.cluster.local"]
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paths: ["/books/*”]
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methods: ["GET”]
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</code></pre><h4 id=using-authenticated-client-identities>使用经过身份验证的客户端身份</h4><p>假设你想把这个 <code>book-reader</code> 角色授予你的 <code>bookstore-frontend</code> 服务。如果您已启用
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您的网格的<a href=/v1.12/zh/docs/concepts/security/#mutual-TLS-authentication>双向 TLS 身份验证</a>, 您可以使用服务帐户,以识别您的 <code>bookstore-frontend</code> 服务。授予 <code>book-reader</code> 角色到 <code>bookstore-frontend</code> 服务可以通过创建一个 <code>ServiceRoleBinding</code> 来完成,如下所示:</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>apiVersion: "rbac.istio.io/v1alpha1"
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kind: ServiceRoleBinding
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metadata:
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name: book-reader
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namespace: default
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spec:
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subjects:
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- user: "cluster.local/ns/default/sa/bookstore-frontend”
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roleRef:
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kind: ServiceRole
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name: "book-reader"
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</code></pre><p>您可能希望通过添加“仅属于 <code>qualified-reviewer</code> 组的用户的条件来进一步限制此操作允许阅读书籍“。<code>qualified-reviewer</code> 组是经过身份验证的最终用户身份 <a href=/v1.12/zh/docs/concepts/security/#authorization>JWT 身份验证</a>。在这种情况下,客户端服务标识(<code>bookstore-frontend</code>)和最终用户身份(<code>qualified-reviewer</code>)的组合将用于授权策略。</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>apiVersion: "rbac.istio.io/v1alpha1"
|
||
kind: ServiceRoleBinding
|
||
metadata:
|
||
name: book-reader
|
||
namespace: default
|
||
spec:
|
||
subjects:
|
||
- user: "cluster.local/ns/default/sa/bookstore-frontend”
|
||
properties:
|
||
request.auth.claims[group]: "qualified-reviewer”
|
||
roleRef:
|
||
kind: ServiceRole
|
||
name: "book-reader"
|
||
</code></pre><h4 id=client-does-not-have-identity>无身份客户</h4><p>强烈建议在授权策略中使用经过身份验证的身份以确保安全性。但是,如果你有一个如果遗留系统不支持身份验证,您可能没有经过身份验证的身份验证。即使没有经过身份验证的身份,您仍然可以使用 Istio 授权来保护您的服务。以下示例表明您可以在授权策略中指定允许的源 IP 范围。</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>apiVersion: "rbac.istio.io/v1alpha1"
|
||
kind: ServiceRoleBinding
|
||
metadata:
|
||
name: book-reader
|
||
namespace: default
|
||
spec:
|
||
subjects:
|
||
- properties:
|
||
source.ip: 10.20.0.0/9
|
||
roleRef:
|
||
kind: ServiceRole
|
||
name: "book-reader"
|
||
</code></pre><h2 id=summary>概要</h2><p>Istio 在命名空间级别,服务级别和方法级别粒度上提供授权功能。它采用“ RBAC + 条件”模型,使其成为易于使用和理解的 RBAC 系统,同时提供 ABAC 系统级别的灵活性。由于 Istio 授权在 Envoy 上本地运行,它有很高的性能。Istio 授权既可以与 <a href=/v1.12/zh/docs/concepts/security/#authentication>Istio 认证功能</a>一起提供最佳的安全性,也可以用于为没有身份验证的旧系统提供访问控制。</p></div><nav class=pagenav><div class=left><a title="使用 AppSwitch 自动接入应用并降低延迟。" href=/v1.12/zh/blog/2018/delayering-istio/ class=next-link><svg class="icon left-arrow"><use xlink:href="/v1.12/img/icons.svg#left-arrow"/></svg>使用 AppSwitch 精简 Istio 层次</a></div><div class=right><a title="如何通过 Stackdriver 将 Istio 访问日志导出到 BigQuery、GCS、Pub/Sub 等不同的接收器。" href=/v1.12/zh/blog/2018/export-logs-through-stackdriver/ class=next-link>通过 Stackdriver 将日志导出到 BigQuery、GCS、Pub/Sub<svg class="icon right-arrow"><use xlink:href="/v1.12/img/icons.svg#right-arrow"/></svg></a></div></nav></article><footer class=footer><div class="footer-wrapper container-l"><div class="user-links footer-links"><a class=channel title="Istio 的代码在 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