如何在C#中手动验证自签名证书? [英] How do I manually validate a self-signed certificate in C#?

问题描述

在过去的几周中，我在Docker容器中进行了大量工作，遇到了一个障碍，在该障碍中，自签名证书会导致问题，因为Docker容器无法识别证书颁发机构.

I’ve been working a lot in Docker containers in the past couple of weeks and I came across the obstacle where a self signed cert was causing issues because the Docker container did not recognize the Certificate Authority.

问题在于，由于我们在公司使用Docker的方式，我无法在服务器配置上放置自己的证书.

The issue was that I was unable to put my own certs on the server configuration because the way we use Docker at my company.

推荐答案

经过大量研究，我提出了一种基于构建链和验证指纹来手动验证证书的解决方案.

After a good bit of research, I came up with a solution that manually validates the cert based off building the chain and verification of the thumbprint.

注意:您必须使用支持证书验证回调的库，以便可以编写自己的委托方法.下面是我的实现.

Note: You have to be using a library that supports a Certificate Validation Callback so that you can code your own delegate method. Below is my implementation.

public static bool ManualSslVerification(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
    try
    {
        //Testing to see if the Certificate and Chain build properly, aka no forgery.
        chain.ChainPolicy.VerificationFlags = X509VerificationFlags.NoFlag;
        chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
        chain.Build(new X509Certificate2(certificate));

        //Looking to see if there are no errors in the build that we don’t like
        foreach (X509ChainStatus status in chain.ChainStatus)
        {
            if (status.Status == X509ChainStatusFlags.NoError || status.Status == X509ChainStatusFlags.UntrustedRoot)
            {
                //Acceptable Status, We want to know if it builds properly.
            }
            else
            {
                return false;
            }
        }

        X509Certificate2 trustedRootCertificateAuthority = new X509Certificate2(ViewController.Properties.Resources.My_Infrastructure_Root_CA);

        //Now that we have tested to see if the cert builds properly, we now will check if the thumbprint of the root ca matches our trusted one
        if(chain.ChainElements[chain.ChainElements.Count – 1].Certificate.Thumbprint != trustedRootCertificateAuthority.Thumbprint)
        {
            return false;
        }

        //Once we have verified the thumbprint the last fun check we can do is to build the chain and then see if the remote cert builds properly with it
        //Testing to see if the Certificate and Chain build properly, aka no forgery.
        X509Chain trustedChain = new X509Chain();
        trustedChain.ChainPolicy.ExtraStore.Add(trustedRootCertificateAuthority);
        trustedChain.ChainPolicy.VerificationFlags = X509VerificationFlags.NoFlag;
        trustedChain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
        trustedChain.Build(new X509Certificate2(certificate));

        //Looking to see if there are no errors in the build that we don’t like
        foreach (X509ChainStatus status in trustedChain.ChainStatus)
        {
            if(status.Status == X509ChainStatusFlags.NoError || status.Status == X509ChainStatusFlags.UntrustedRoot)
            {
                //Acceptable Status, We want to know if it builds properly.
            }
            else
            {
                return false;
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex);
        return false;
    }

    return true;
}

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