SMTP - SSL 证书问题 - C# - 为啥此代码有效？

Posted 2023-03-15

【中文标题】SMTP - SSL 证书问题 - C# - 为啥此代码有效？

【英文标题】：SMTP - SSL Certificate Issue - C# - Why this code works?SMTP - SSL 证书问题 - C# - 为什么此代码有效？

【发布时间】：2019-03-12 19:55:41

【问题描述】：

现在，这个问题在 Stack Overflow 中有几个版本，例如 most viewed question，其中大多数答案建议用户关闭 SSL 作为绕过代码的方法。

我在尝试发送电子邮件时遇到了同样的异常。

System.Security.Authentication.AuthenticationException： 远程证书根据验证无效 过程。

这是我的代码

private void sendAMail(String toAddress, String messageBody)
        
            String msg = "Sending mail to : " + toAddress;

            MailMessage mail = new MailMessage();
            mail.To.Add(toAddress);
            mail.From = new MailAddress("[e-mail]");
            mail.Subject = "Subject: Test Mail";
            mail.Body = messageBody;
            mail.IsBodyhtml = true;            

            SmtpClient smtp = new SmtpClient();

            smtp.Host = "myhostname.com";            
            smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "");
            smtp.EnableSsl = true;
            smtp.Port = 587;            
            smtp.Send(mail);            
        

在尝试几件事时，最后我尝试从服务器打印 SSL 证书，如此处所述。Print SSL Cert

然后，异常消失了。！！！我不知道为什么。

这是有效的代码

private void sendAMail(String toAddress, String messageBody)
        
            String msg = "Sending mail to : " + toAddress;

            MailMessage mail = new MailMessage();
            mail.To.Add(toAddress);
            mail.From = new MailAddress("[e-mail]");
            mail.Subject = "Subject: Test Mail";
            mail.Body = messageBody;
            mail.IsBodyHtml = true;            

            //Added this line here
            System.Net.ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(RemoteServerCertificateValidationCallback);
            SmtpClient smtp = new SmtpClient();

            smtp.Host = "myhostname.com";            
            smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "");
            smtp.EnableSsl = true;
            smtp.Port = 587;            
            smtp.Send(mail);            
        


private bool RemoteServerCertificateValidationCallback(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors)

    //Console.WriteLine(certificate);
    return true;

请解释它在原始代码仍然抛出异常时工作的原因。

【参考方案1】：

以下代码告诉您的应用程序信任所有证书，即使它们无效。

最好不要这样做。

private bool RemoteServerCertificateValidationCallback(object sender,
System.Security.Cryptography.X509Certificates.X509Certificate
certificate, System.Security.Cryptography.X509Certificates.X509Chain
chain, System.Net.Security.SslPolicyErrors sslPolicyErrors) 
    //Console.WriteLine(certificate);
    return true;