ssl - 客户端证书验证与证书固定相结合

Question

在使用客户端证书进行身份验证后，是否需要执行证书固定？谁能给我解释一下？

if (challenge.ProtectionSpace.AuthenticationMethod == NSUrlProtectionSpace.AuthenticationMethodClientCertificate)
{
    Console.WriteLine("Client Cert!");

    var options = NSDictionary.FromObjectAndKey(NSObject.FromObject(This._passphrase), SecImportExport.Passphrase);

    NSDictionary[] importResult;

    if (This?._certificate == null) return;
    if (This?._passphrase == null) return;

    var x509Certificate = new X509Certificate(This._certificate, This._passphrase);

    SecStatusCode statusCode = SecImportExport.ImportPkcs12(This._certificate, options, out importResult);
    var identityHandle = importResult[0][SecImportExport.Identity];
    var identity = new SecIdentity(identityHandle.Handle);
    var certificate = new SecCertificate(x509Certificate.GetRawCertData());

    SecCertificate[] certificates = { certificate };
    NSUrlCredential credential = NSUrlCredential.FromIdentityCertificatesPersistance(identity, certificates, NSUrlCredentialPersistence.ForSession);
                completionHandler(NSUrlSessionAuthChallengeDisposition.UseCredential, credential);

    return;
}

*Logic for SSL Pinning*

由于在“clientcertificate request and client authentication”部分之后有一个return statement，因此永远不会执行证书固定的逻辑，所以我问自己在使用客户端证书执行身份验证后这部分是否过时了。

Answer 1

客户端证书用于根据服务器对客户端进行身份验证，仅此而已。服务器证书用于确保您与正确的服务器通信。

发送客户端证书不能代替正确检查服务器证书。否则，中间人攻击者可以简单地向客户端索取客户端证书，希望客户端接受攻击者伪造的服务器证书作为交换。