B.3. TLS-Terminating Proxies (B.3. TLS 终止代理)

本例中, 在资源前存在 TLS 终止反向代理. 客户端不对请求签名, 而使用双向 TLS 发起调用. 终止代理校验 TLS 流并按 [CLIENT-CERT] 注入 Client-Cert 头字段, 然后对该字段应用签名. 通过对该头字段签名, 反向代理既能证明其对初始请求 TLS 参数的校验, 也能独立于客户端行为向后端系统认证自身.

客户端使用双向 TLS 向 TLS 终止代理发出下列请求:

POST /foo?param=Value&Pet=dog HTTP/1.1 Host: example.com Date: Tue, 20 Apr 2021 02:07:55 GMT Content-Type: application/json Content-Length: 18

{"hello": "world"}

代理处理 TLS 连接并将客户端 TLS 证书提取到 Client-Cert 头字段, 转发至托管于 service.internal.example 的内部服务. 这产生下列未签名请求:

NOTE: '' line wrapping per RFC 8792

POST /foo?param=Value&Pet=dog HTTP/1.1 Host: service.internal.example Date: Tue, 20 Apr 2021 02:07:55 GMT Content-Type: application/json Content-Length: 18 Client-Cert: :MIIBqDCCAU6gAwIBAgIBBzAKBggqhkjOPQQDAjA6MRswGQYDVQQKD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=:

{"hello": "world"}

若无签名, 内部服务需信任传入连接具有正确信息. 通过对 Client-Cert 头字段与内部请求的其他部分签名, 内部服务可确信可信代理这一正确方已处理请求并将其呈现给正确服务. 代理的签名基由下列组成:

NOTE: '' line wrapping per RFC 8792

"@path": /foo "@query": ?param=Value&Pet=dog "@method": POST "@authority": service.internal.example "client-cert": :MIIBqDCCAU6gAwIBAgIBBzAKBggqhkjOPQQDAjA6MRswGQYDVQQ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=: "@signature-params": ("@path" "@query" "@method" "@authority"
"client-cert");created=1618884473;keyid="test-key-ecc-p256"

这产生下列签名:

NOTE: '' line wrapping per RFC 8792

xVMHVpawaAC/0SbHrKRs9i8I3eOs5RtTMGCWXm/9nvZzoHsIg6Mce9315T6xoklyy0y
zhD9ah4JHRwMLOgmizw==

从而在标签 ttrp 下产生代理发往内部服务的下列已签名请求:

NOTE: '' line wrapping per RFC 8792

{"hello": "world"}

内部服务可校验代理的签名, 从而能够信任客户端证书已得到适当处理.

B.3. TLS-Terminating Proxies (B.3. TLS 终止代理)​

B.3. TLS-Terminating Proxies (B.3. TLS 终止代理)