详解.NET Core 使用HttpClient SSL请求出错的解决办法

时间:2021-08-01 16:36:03

问题

使用 HTTP Client 请求 HTTPS 的 API 时出现 The certificate cannot be verified up to a trusted certification authority 异常,并且证书已经传入。

下面就是问题代码:

public class Program
{
 public static void Main(string[] args)
 {
  var url = @"https://xxx.xxx.xxx.xxx:xxxx/xxx-web/services/xxxx?wsdl";

  var handler = new HttpClientHandler
  {
   ClientCertificateOptions = ClientCertificateOption.Manual,
   ClientCertificates =
   {
    new X509Certificate2(@"E:\cert\rootTrust.cer","11111111"),
    new X509Certificate2(@"E:\cert\middleTrust.cer","11111111"),
    new X509Certificate2(@"E:\cert\wskey.pfx","ws654321")
   }
  };
  
  var webRequest = new HttpClient(handler);
  var result = webRequest.GetStringAsync(url).GetAwaiter().GetResult();
  Console.WriteLine(result);
 }
}

原因

因为在发出 HTTPS 请求的时候,HttpClient 都会检查 SSL 证书是否合法。如果不合法的话,就会导致抛出异常信息,而对方给出的证书是自签发的测试接口的证书,所以不是一个合法的 SSL 证书。

解决

在 HttpClientHandler 当中会有一个 ServerCertificateCustomValidationCallback 事件,该事件用于判定证书验证是否通过。我们可以挂接该事件,然后逻辑编写为直接返回 true 结果,这样就会忽略掉证书异常的情况。

最新的代码如下:

public class Program
{
 public static void Main(string[] args)
 {
  var url = @"https://xxx.xxx.xxx.xxx:xxxx/xxx-web/services/xxxx?wsdl";

  var handler = new HttpClientHandler
  {
   ServerCertificateCustomValidationCallback = (message, certificate2, arg3, arg4) => true, 
   ClientCertificateOptions = ClientCertificateOption.Manual,
   ClientCertificates =
   {
    new X509Certificate2(@"E:\cert\rootTrust.cer","11111111"),
    new X509Certificate2(@"E:\cert\middleTrust.cer","11111111"),
    new X509Certificate2(@"E:\cert\wskey.pfx","ws654321")
   }
  };
  
  var webRequest = new HttpClient(handler);
  var result = webRequest.GetStringAsync(url).GetAwaiter().GetResult();
  Console.WriteLine("xx");
 }
}

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