Xamarin: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found

问题

In Xamarin. I've been trying to make communications between my Web API and my Xamarin project. Here's the code for my controller:

//  GET api/values
    public List<string> Get()
    {
        List<string> values = new List<string>();
        values.Add("Value 1");
        values.Add("Value 2");
        return values;
    }

And here is my GET request in my MainPage.xaml.cs

    public async void BindToListView()
    {
        HttpClient client = new HttpClient();
        var response = await client.GetStringAsync("https://10.0.2.2:#####/api/Values");
        var posts = JsonConvert.DeserializeObject<List<Posts>>(response);
        lv.ItemsSource = posts;
    }

Whenever I try to run both my Android application and my Web API Application. I keep getting this exception:

    Javax.Net.Ssl.SSLHandshakeException: 
'java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.'

I've tried pasting this into my MainActivity.cs, but it still doesn't work.

ServicePointManager.ServerCertificateValidationCallback += (o, cert, chain, errors) => true;

I've been having this problem for months now, and its driving me crazy. Am I missing something? I'm fairly new in developing Xamarin applications, and this is a problem that I can't seem to resolve.

Any suggestions on how to resolve this problem will be greatly appreciated. Thanks for taking the time in reading this.

回答1:

//Use this, it worked for me. 

HttpClient client;

public class datastore {
   var httpClientHandler = new HttpClientHandler();
            
   httpClientHandler.ServerCertificateCustomValidationCallback = 
   (message, cert, chain, errors) => { return true; };

   client = new HttpClient(httpClientHandler);
}

//... use the client to make request. it will bypass 
//the ssl certificates verification.

回答2:

For Android you should do something more .

in Forms ,create an interface

public interface IHTTPClientHandlerCreationService
{
  HttpClientHandler GetInsecureHandler();
}

in Android implemented the interface:

[assembly: Dependency(typeof(HTTPClientHandlerCreationService_Android))]
namespace xxx.Droid
{
  public class HTTPClientHandlerCreationService_Android : CollateralUploader.Services.IHTTPClientHandlerCreationService
  {
    public HttpClientHandler GetInsecureHandler()
    {
      return new IgnoreSSLClientHandler();
    }
  }

  internal class IgnoreSSLClientHandler : AndroidClientHandler
  {
    protected override SSLSocketFactory ConfigureCustomSSLSocketFactory(HttpsURLConnection connection)
    {
      return SSLCertificateSocketFactory.GetInsecure(1000, null);
    }

    protected override IHostnameVerifier GetSSLHostnameVerifier(HttpsURLConnection connection)
    {
      return new IgnoreSSLHostnameVerifier();
    }
  }

  internal class IgnoreSSLHostnameVerifier : Java.Lang.Object, IHostnameVerifier
  {
    public bool Verify(string hostname, ISSLSession session)
    {
      return true;
    }
  }
}

And when you call the method Get

public async void BindToListView()
{
  HttpClient client;

  switch (Device.RuntimePlatform)
  {
    case Device.Android:
      this.httpClient = new HttpClient(DependencyService.Get<Services.IHTTPClientHandlerCreationService>().GetInsecureHandler());
      break;
    default:
      ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;
      this.httpClient = new HttpClient(new HttpClientHandler());
      break;
  }

  var response = await client.GetStringAsync("https://10.0.2.2:#####/api/Values");
  var posts = JsonConvert.DeserializeObject<ObservableCollection<Posts>>(response);
  lv.ItemsSource = posts;
}

In addition, I suggest that you can use ObservableCollection instead of List because it has implemented the interface INotifyPropertyChanged . Otherwise the UI will never been updated .

来源：https://stackoverflow.com/questions/58376095/xamarin-java-security-cert-certpathvalidatorexception-trust-anchor-for-certifi

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