C# X509Certificate2.Verify 没有吊销测试

Question

我尝试使用 X509Certificate2.Verify() 函数来检查证书链是否有效。 Verify 函数 returns false 和 ChainElementStatus returns "RevocationStatusUnknown".

有没有办法在不检查RevocationStatus的情况下使用Verify函数？没有互联网连接无法检查 RevocationStatus？是否有其他功能可以在没有 RevocationStatus 的情况下检查链和证书？

一个肮脏的解决方案是检查 RevocationStatus 是否是 element.ChainElementStatus 中的唯一元素。

我已经在使用 X509RevocationMode.Offline 和 IgnoreCertificateAuthorityRevocationUnknown。

代码来自：X509Certificate2.Verify() method always return false for the valid certificate

X509Chain ch = new X509Chain();

ch.Build(certificate);

ch.ChainPolicy.RevocationMode = X509RevocationMode.Offline;
ch.ChainPolicy.VerificationFlags = X509VerificationFlags.IgnoreCertificateAuthorityRevocationUnknown;

Console.WriteLine("Chain Information");
Console.WriteLine("Chain revocation flag: {0}", ch.ChainPolicy.RevocationFlag);

Console.WriteLine("Chain revocation mode: {0}", ch.ChainPolicy.RevocationMode);
Console.WriteLine("Chain verification flag: {0}", ch.ChainPolicy.VerificationFlags);
Console.WriteLine("Chain verification time: {0}", ch.ChainPolicy.VerificationTime);
Console.WriteLine("Chain status length: {0}", ch.ChainStatus.Length);
Console.WriteLine("Chain application policy count: {0}", ch.ChainPolicy.ApplicationPolicy.Count);
Console.WriteLine("Chain certificate policy count: {0} {1}", ch.ChainPolicy.CertificatePolicy.Count, Environment.NewLine);

//Output chain element information.
Console.WriteLine("Chain Element Information");
Console.WriteLine("Number of chain elements: {0}", ch.ChainElements.Count);
Console.WriteLine("Chain elements synchronized? {0} {1}", ch.ChainElements.IsSynchronized, Environment.NewLine);

foreach (X509ChainElement element in ch.ChainElements)
{
Console.WriteLine("Element issuer name: {0}", element.Certificate.Issuer);
Console.WriteLine("Element certificate valid until: {0}", element.Certificate.NotAfter);
Console.WriteLine("Element certificate is valid: {0}", element.Certificate.Verify());
Console.WriteLine("Element error status length: {0}", element.ChainElementStatus.Length);
Console.WriteLine("Element information: {0}", element.Information);
Console.WriteLine("Number of element extensions: {0}{1}", element.Certificate.Extensions.Count, Environment.NewLine);

    if (ch.ChainStatus.Length >= 1)
    {
        for (int index = 0; index < element.ChainElementStatus.Length; index++)
        {
            Console.WriteLine(element.ChainElementStatus[index].Status);
            Console.WriteLine(element.ChainElementStatus[index].StatusInformation);
        }
    }
}

结果：

连锁信息链撤销标志：ExcludeRoot 链撤销方式：离线链验证标志：IgnoreCertificateAuthorityRevocationUnknown 上链验证时间：19.11.201807:53:31 链状态长度：1 链应用策略计数：0 链证书策略计数：0

链元素信息链条数量：2 链元素同步？错误

元素颁发者名称：CN=TestRootCA 元素证书有效期至：01.01.2019 00:00:00 元素证书是否有效：False 元素错误状态长度：1 元素信息：元素扩展数：5

撤销状态未知 Die Sperrfunktion konnte keine Sperrprüfung für das Zertifikat durchführen。

元素颁发者名称：CN=TestRootCA 元素证书有效期至：01.01.2019 00:00:00 元素证书是否有效：True 元素错误状态长度：0 元素信息：元素扩展数：2

Answer 1

I already use X509RevocationMode.Offline and IgnoreCertificateAuthorityRevocationUnknown.

IgnoreCertificateAuthorityRevocationUnknown 的意思是 "don't make chain.Build return false for this reason."

当然是你在调用chain.Build之后设置的，而你并没有检查chain.Build中的return值。

如果您想忽略吊销，请将 ChainPolicy.RevocationMode 设置为 X509RevocationMode.NoCheck。如果您希望检查它是否已经缓存，如果没有则忽略它，然后将模式设置为离线并断言所有 RevocationUnknown 标志。

如果 certificate/chain 通过了所有未通过 VerificationFlags 值标记为忽略的有效性检查，则来自 chain.Build 的布尔值 return 为真。

所以最短的"tell me if this certificate is not expired, has a resolvable chain, the terminus of the chain is something I trust, and I don't care about revocation"是

using (X509Chain ch = new X509Chain())
{
    ch.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;

    return ch.Build(certificate);
}

机会撤销将是

using (X509Chain ch = new X509Chain())
{
    ch.ChainPolicy.RevocationMode = X509RevocationMode.Offline;
    ch.ChainPolicy.VerificationFlags =
        X509VerificationFlags.IgnoreEndRevocationUnknown |
        X509VerificationFlags.IgnoreCertificateAuthorityRevocationUnknown |
        X509VerificationFlags.IgnoreRootRevocationUnknown;

    return ch.Build(certificate);
}

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