获取SSL证书信息- .net

本文关键字：net 信息 证书 SSL 获取 | 更新日期: 2023-09-27 18:03:21

我希望从任何给定的域名SSL证书获得数据。例如，我想输入任何网站地址。"http://stackoverflow.com"，我的代码将首先检查SSL证书是否存在。如果是这样的话，我想让它把证书的到期日拉出来。[i am reading Domainnames from DB]示例:http://www.digicert.com/help/

我需要创建一个web服务来检查到期日期。我该如何实现它??-我查了很多不同的东西，比如RequestCertificateValidationCallback和ClientCertificates等。因为我是新手，我不知道该做些什么。

我可能是完全错误的(因此为什么我需要帮助)，但我会创建一个HTTPWebRequest，然后以某种方式请求客户端证书和特定的元素吗?

我尝试了提供的示例@SSL证书预取。net，但我被禁止403错误。

任何帮助都将非常感激-谢谢。

这是我写的抛出403 forbidden错误的代码。

        Uri u = new Uri("http://services.efi.com/");
        ServicePoint sp = ServicePointManager.FindServicePoint(u);
        string groupName = Guid.NewGuid().ToString();
        HttpWebRequest req = HttpWebRequest.Create(u) as HttpWebRequest;
        req.Accept = "*/*";
        req.ConnectionGroupName = groupName;
        using (WebResponse resp = req.GetResponse())
        {
            // Ignore response, and close the response.
        }
        sp.CloseConnectionGroup(groupName);
        // Implement favourite null check pattern here on sp.Certificate
        string expiryDate = sp.Certificate.GetExpirationDateString();
        string str = expiryDate;

获取SSL证书信息- .net

运行正常:

namespace ConsoleApplication1
{
  using System;
  using System.Net;
  using System.Net.Security;
  using System.Security.Cryptography.X509Certificates;
  class Program
  {
    static void Main()
    {
      ServicePointManager.ServerCertificateValidationCallback += ServerCertificateValidationCallback;
      var request = WebRequest.Create("https://www.google.com");
      var response = request.GetResponse();
      Console.WriteLine("Done.");
      Console.ReadLine();
    }
    private static bool ServerCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
      Console.WriteLine("Certificate expires on " + certificate.GetExpirationDateString());
      return true;
    }
  }
}

您将获得"403 forbidden"状态，因为这是服务器在您访问该页面时返回的内容。当我使用IE浏览到那个Uri时，我看到了同样的事情。此状态表明您没有访问该Url的权限，因此也许您应该在您有权访问的页面上尝试您的代码。

此外，您不太可能在http连接上看到证书-您可能想要尝试https。

如果需要下载证书:

            //Do webrequest to get info on secure site
        var certName = "FileName";
        var url = "https://mail.google.com";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        response.Close();
        //retrieve the ssl cert and assign it to an X509Certificate object
        X509Certificate cert = request.ServicePoint.Certificate;
        //convert the X509Certificate to an X509Certificate2 object by passing it into the constructor
        X509Certificate2 cert2 = new X509Certificate2(cert);
        string cn = cert2.GetIssuerName();
        string cedate = cert2.GetExpirationDateString();
        string cpub = cert2.GetPublicKeyString();
        var path = Directory.GetCurrentDirectory() + string.Concat("''", certName, ".der");
        byte[] certData = cert2.Export(X509ContentType.Cert);
        File.WriteAllBytes(path, certData);
        Console.WriteLine("cert2.GetIssuerName :{0}", cert2.GetIssuerName());
        Console.WriteLine("cert2.GetExpirationDateString :{0}", cert2.GetExpirationDateString());
        Console.WriteLine("cert2.GetPublicKeyString :{0}", cert2.GetPublicKeyString());

.cs示例文件:https://gist.github.com/thedom85/6db200104c075310527aaef63b172253

我也推荐这个网站:https://www.simple-talk.com/dotnet/.net-framework/tlsssl-and-.net-framework-4.0/

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