在C#中使用IP检查SSL证书的有效性

using System;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

public class SSLCertificateChecker
{
    public static bool CheckCertificateValidity(string url)
    {
        // 创建HTTP请求对象
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        // 设置自定义的证书验证回调函数
        ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;

        try
        {
            // 发送HTTP请求并获取响应
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                // 在这里可以处理响应结果
                // ...
            }

            // 证书验证通过
            return true;
        }
        catch (WebException ex)
        {
            // 证书验证失败
            return false;
        }
    }

    private static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        // 获取服务器的IP地址
        ServicePoint servicePoint = ServicePointManager.FindServicePoint((sender as HttpWebRequest).Address);
        string ipAddress = servicePoint.Address.ToString();

        // 遍历证书链中的每个证书，验证证书的有效性
        foreach (X509ChainElement chainElement in chain.ChainElements)
        {
            X509Certificate2 cert = chainElement.Certificate;

            // 在这里可以根据需要检查证书的各种属性
            // ...

            // 使用X509Certificate2类的Verify方法验证证书的有效性
            if (!cert.Verify())
            {
                // 证书验证失败
                return false;
            }
        }

        // 证书验证通过
        return true;
    }
}

string url = "https://example.com";
bool isValid = SSLCertificateChecker.CheckCertificateValidity(url);
Console.WriteLine("SSL certificate is valid: " + isValid);