如何在C＃中手動驗證自簽名證書？

Question

在過去的幾周中，我一直在Docker容器中進行大量工作，並且遇到了自簽名證書導致問題的障礙，因為Docker容器無法識別證書頒發機構。

問題是我無法在服務器配置上放置自己的證書，因為我們在公司使用Docker的方式。

Answer 1

經過大量研究，我提出了一個解決方案，該解決方案基於構建鏈和驗證指紋的方式手動驗證證書。

注意：您必須使用支持證書驗證回調的庫，以便可以編寫自己的委托方法。 下面是我的實現。

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;
}