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---
title: "Zero-Trust Access"
type: concept
tags: ["AWS", "Security", "Zero-Trust", "IAM", "SSM"]
sources: ["ctp-topic-31-network-segregation-and-secure-access-to-the-new-aws-landing-zones"]
last_updated: 2026-05-08
---
## Definition
零信任访问Zero-Trust Access是一种安全模型核心理念是"永不信任,始终验证"——无论请求来自网络内部还是外部,均需经过身份验证和授权检查。
## In AWS Landing Zone Context
在 [[ctp-topic-31-network-segregation-and-secure-access-to-the-new-aws-landing-zones]] 中SSM 替代 VPN 体现了零信任访问原则:
- **默认不信任**:用户每次访问都需要通过 IAM 角色认证
- **最小权限**:仅授予访问特定 EC2 实例 SSM Agent 的权限
- **无需 VPN**:不依赖网络层面的信任,通过 IAM + SSM Agent 实现精细化访问控制
- **双因素认证**:结合 AWS IAM 条件和多因素认证MFA
## Relationship to Traditional VPN
| 维度 | 传统 VPN | Zero-Trust (SSM) |
|------|---------|------------------|
| 信任边界 | 网络层VPN 隧道内即信任) | 身份层(每次验证) |
| 访问范围 | 网段级别(全网可通) | 实例级别(精确到单台 EC2 |
| 凭证管理 | VPN 共享凭证 | IAM Role 动态凭证 |
| 双因素 | 依赖 VPN 提供商 | 依赖 AWS IAM + MFA |
## Long-term Vision
在 [[ctp-topic-31-network-segregation-and-secure-access-to-the-new-aws-landing-zones]] 中描述的演进路径:
- 当前SSM 零信任访问(临时方案)
- 最终目标IaC 化 + Break-glass 应急访问,彻底消除控制台登录
## Related Concepts
- [[Network-Segmentation]] — 零信任网络隔离
- [[IAM-Role]] — 零信任身份模型
- [[AWS-SSM]] — 零信任访问的具体实施工具
## Related Sources
- [[ctp-topic-31-network-segregation-and-secure-access-to-the-new-aws-landing-zones]]