CODEWITHSUNDEEP
javaflutterssldartca
Duality Zamenhoff
Duality Zamenhoff

Reputation: 29

Flutter Websocket client ssl handshake failure

The server works correctly, tested with an echo client.

Altough when I run my app with:

 final channel = IOWebSocketChannel.connect("wss://hostname:port");
    channel.sink.add('test');
    channel.stream.listen((message) {
      debugPrint(message);
      channel.sink.close(status.goingAway);

The debug console exceptions with this recurring message:

E/flutter (19705): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: WebSocketChannelException: WebSocketChannelException: HandshakeException: Handshake error in client (OS Error: 
E/flutter (19705):  CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:354))

I tried in many ways make my flutter app trust the Let`s Encrypt CA with no success.

Any response towards resolving my issue will be much appreciated!

Upvotes: 2

Views: 3028

Answers (2)

Ebram
Ebram

Reputation: 1102

    class MyHttpOverrides extends HttpOverrides {
  @override
  HttpClient createHttpClient(SecurityContext context) {
    return super.createHttpClient(context)
      ..badCertificateCallback =
          (X509Certificate cert, String host, int port) => true;
  }
}

void main() {
  HttpOverrides.global = new MyHttpOverrides();
  runApp(MyApp());
}

Upvotes: 2

Duality Zamenhoff
Duality Zamenhoff

Reputation: 29

OK, i fixed it a week ago and forgot to post the answer. It's more of a workaround but it's stable nevertheless... I used an apache2 webserver that uses a reverse proxy to the websocket server. Now the apache server has the certificate in place and I used s_client on openssl to check whether the browser/client accepts the certificate, it did after I used apache2 as a reverse proxy.

Upvotes: 0

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