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C＃从ServerCertificateValidationCallback获取SMTP-Server的SSL证书到期日期作为返回值

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目前我已获得此代码以获取SMTP服务器的到期日期：

namespace SMTPCert
{
    public class SMTPCert
    {
        public static void GetSMTPCert(string ServerName)
        {
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(RemoteServerCertificateValidationCallback);
            using (System.Net.Mail.SmtpClient S = new System.Net.Mail.SmtpClient(ServerName))
            {
                S.EnableSsl = true;
                using (System.Net.Mail.MailMessage M = new System.Net.Mail.MailMessage("test@example.com", "test@example.com", "Test", "Test"))
                {
                    try
                    {
                        S.Send(M);
                    }
                    catch (Exception)
                    {
                        return;
                    }
                }
            }
        } 

    private static bool RemoteServerCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        Console.WriteLine(certificate);
        return true;
    }
}

}

我的问题是我想将GetSMTPCert方法从void更改为string，我可以将证书过期日期返回到我的main方法 . 但目前我只能在RemoteServerCertificateValidationCallback方法中获取到期日期，并且无法从那里返回它 . 是否有任何可能的方法将证书过期日期提供给我的GetSMTPCert方法，然后将其返回到我的main方法？

关于获取SMTP服务器的SSL证书到期日期的其他方法的建议也是受欢迎的 .

c# ssl ssl-certificate

1 回答

  • 0

    好的我通过将类型为字符串“CertificateDaysLeft”的公共静态字段添加到我的SMTPCert类来解决了这个问题 .

    namespace SMTPCert
{
    public static string CertificateDaysLeft;

    public static string GetSMTPCert(string ServerName)
    {
        ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(RemoteServerCertificateValidationCallback);
        using (System.Net.Mail.SmtpClient S = new System.Net.Mail.SmtpClient(ServerName))
        {
            S.EnableSsl = true;
            using (System.Net.Mail.MailMessage M = new System.Net.Mail.MailMessage("test@example.com", "test@example.com", "Test", "Test"))
            {
                try
                {
                    S.Send(M);
                    string daysLeft = CertificateDaysLeft;
                    return daysLeft;
                }
                catch (Exception)
                {
                    string daysLeft = CertificateDaysLeft;
                    return daysLeft;
                }
            }
        }
    }

    private static bool RemoteServerCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        DateTime ExpirDate = Convert.ToDateTime(certificate.GetExpirationDateString());
        string DaysLeft = Convert.ToString((ExpirDate - DateTime.Today).Days);
        CertificateDaysLeft = DaysLeft;
        Console.WriteLine(certificate);
        return true;
    }
}

    }

    我想我觉得有点太复杂了 .

    回复于

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