SSL_CTX_set_verify（）回调和当前深度

问题描述

我在C语言编写我自己的回调函数执行额外的证书检查时（ preverify_ok 参数 1 ）。不过，我想执行的检查仅的为叶证书（深度= 0）。

I'm writing my own callback function in C for SSL_CTX_set_verify() to perform additional certificate checks (when the preverify_ok parameter is 1). However, I want to perform the checks only for the leaf certificate (depth = 0).

有是函数，获取错误的深度;但我想目前的深度，即使没有错误，所以我可以完成我的其他检查，只有当深度= 0。 （注意函数 SSL_CTX_get_verify_depth（）返回深度的限制的和的不的当前深度。）

There is the function X509_STORE_CTX_get_error_depth() that gets the depth of the error; but I want the current depth even when there is no error so I can perform my additional checks only when depth=0. (Note that the function SSL_CTX_get_verify_depth() returns the depth limit and not the current depth.)

有没有办法做我想做什么？

Is there any way to do what I want?

推荐答案

尽管名称，的在验证过程的 error_depth 确正在检查的当前证书。请参阅的，而循环internal_verify 在加密/ X509 / x509_vfy.c 。如果任何回调或任何内建的检查 - 在这里签名或过期，在其他地方在 X509_verify_cert 撤销，政策等 - 决定一个证书是坏的，验证逻辑返回与 error_depth 留在引起验证返回证书，并从上面的后续调用发现它标识'错误'证书的价值。

In spite of the name, during the verify process error_depth is indeed the current certificate being checked. See the while loop in internal_verify in crypto/x509/x509_vfy.c. If either the callback or any builtin check -- here signature or expired, in other places in X509_verify_cert revocation, policy, etc. -- decides a cert is bad, verify logic returns with error_depth left at the cert that caused verify to return, and a subsequent call from 'above' finds that value which identifies the 'error' cert.

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