Update nexus: fix conflicts and sync local changes
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---
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title: "Fail-Closed"
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type: concept
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tags: [authorization, security, default-deny]
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sources: [agentic-identity-trust.md]
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last_updated: 2026-04-25
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---
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## Definition
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Fail-Closed(故障关闭)是一种安全授权策略——当验证系统无法完成验证时,默认结果为**拒绝**,而非**允许**。这是 Zero-Trust 架构的必然推论。
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## Fail-Closed Rules
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| 验证失败场景 | 默认行为 |
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|------------|---------|
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| 身份无法验证 | 拒绝操作 |
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| 委托链存在断裂 | 拒绝操作 |
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| 证据无法写入 | 拒绝操作 |
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| 信任评分低于阈值 | 要求重新验证,拒绝操作 |
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| 凭证已过期 | 拒绝操作 |
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## vs. Fail-Open
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| 策略 | 无法验证时的行为 | 适用场景 |
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|------|----------------|---------|
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| **Fail-Closed**(本文档) | 拒绝操作 | 高风险操作(金融交易、基础设施部署、物理控制) |
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| **Fail-Open** | 允许操作 | 低风险操作(读操作、内部服务调用) |
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## Relationships
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- [[Zero-Trust]]:Fail-Closed 是 Zero-Trust 默认不信任原则的具体化
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- [[Delegation-Chain]]:委托链验证采用 Fail-Closed 策略
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- [[Peer-Verification]]:Peer 验证的所有检查均采用 Fail-Closed
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## Sources
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- [[agentic-identity-trust.md]]
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---
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title: "Fail-Closed"
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type: concept
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tags: [authorization, security, default-deny]
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sources: [agentic-identity-trust.md]
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last_updated: 2026-04-25
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---
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## Definition
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Fail-Closed(故障关闭)是一种安全授权策略——当验证系统无法完成验证时,默认结果为**拒绝**,而非**允许**。这是 Zero-Trust 架构的必然推论。
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## Fail-Closed Rules
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| 验证失败场景 | 默认行为 |
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|------------|---------|
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| 身份无法验证 | 拒绝操作 |
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| 委托链存在断裂 | 拒绝操作 |
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| 证据无法写入 | 拒绝操作 |
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| 信任评分低于阈值 | 要求重新验证,拒绝操作 |
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| 凭证已过期 | 拒绝操作 |
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## vs. Fail-Open
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| 策略 | 无法验证时的行为 | 适用场景 |
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|------|----------------|---------|
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| **Fail-Closed**(本文档) | 拒绝操作 | 高风险操作(金融交易、基础设施部署、物理控制) |
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| **Fail-Open** | 允许操作 | 低风险操作(读操作、内部服务调用) |
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## Relationships
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- [[Zero-Trust]]:Fail-Closed 是 Zero-Trust 默认不信任原则的具体化
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- [[Delegation-Chain]]:委托链验证采用 Fail-Closed 策略
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- [[Peer-Verification]]:Peer 验证的所有检查均采用 Fail-Closed
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## Sources
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- [[agentic-identity-trust.md]]
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