在客户端程序的OpenSSL证书吊销检查使用OCSP装订 [英] OpenSSL certificate revocation check in client program using OCSP stapling

问题描述

我有一个安全的连接到使用OpenSSL服务器的嵌入式C客户端程序。服务器握手过程中提供其证书，客户必须检查该证书的吊销状态。目前我使用OCSP做到这一点。

I have an embedded C client program that securely connects to a server using OpenSSL. The server provides its certificate during the handshake and the client has to check the revocation status of this certificate. Currently I do this by using OCSP.

所有这些工作，但现在我需要使用 OCSP装订（假设服务器将开始提供这一点）。

All of this works, but now I need to re-implement the client's revocation check using OCSP stapling (assuming the server will start providing this).

目前，我得到使用 X509服务器证书*证书= SSL_get_peer_certificate（SSL）来检查的SubjectAltName 对我服务器的域名，并获得 authorityInfoAccess （OCSP的URI）。

Currently I get the server certificate using X509 *cert = SSL_get_peer_certificate(ssl) to check the subjectAltName against my server's domain and get the authorityInfoAccess (for OCSP URI).

假设我有一个 SSL * SSL; 和我通过所以SSL_connect（SSL）成功地把一切都连接; ，我该怎么办在这一点上，我们就到OCSP装订信息和验证我刚刚收到的证书？我找不到任何样品code为如何真正实现这一点使用OpenSSL库。

Assuming I have an SSL * ssl; and I successfully set everything up and connected via SSL_connect(ssl);, what do I do at this point to get at the OCSP stapling information and verify the certificate I just received? I can't find any sample code for how to actually implement this using the OpenSSL library.

推荐答案

有几个步骤：

1. 在客户端通过 SSL_set_tlsext_status_type（SSL，TLSEXT_STATUSTYPE_ocsp）发送 status_request 扩展。

注册一个回调（和参数）审查通过 SSL_CTX_set_tlsext_status_cb OCSP响应（CTX，ocsp_resp_cb）和 SSL_CTX_set_tlsext_status_arg（CTX，ARG ）

Register a callback (and argument) to examine the OCSP response via SSL_CTX_set_tlsext_status_cb(ctx, ocsp_resp_cb) and SSL_CTX_set_tlsext_status_arg(ctx, arg)

写的回调函数。通过的s_client.First 使用的一种演示了如何获得的响应信息：

Write the callback function. The one used by s_client demonstrates how to get at the response information:

static int ocsp_resp_cb(SSL *s, void *arg)
{
const unsigned char *p;
int len;
OCSP_RESPONSE *rsp;
len = SSL_get_tlsext_status_ocsp_resp(s, &p);
BIO_puts(arg, "OCSP response: ");
if (!p)
    {
    BIO_puts(arg, "no response sent\n");
    return 1;
    }
rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
if (!rsp)
    {
    BIO_puts(arg, "response parse error\n");
    BIO_dump_indent(arg, (char *)p, len, 4);
return 0;
}
BIO_puts(arg, "\n======================================\n");
OCSP_RESPONSE_print(arg, rsp, 0);
BIO_puts(arg, "======================================\n");
OCSP_RESPONSE_free(rsp);
return 1;
}

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