Add flag for secure connections.

Source/MQTTnet.AspnetCore/MqttConnectionContext.cs

@@ -20,6 +20,7 @@ namespace MQTTnet.AspNetCore
         }
 
         public string Endpoint => Connection.ConnectionId;
+        public bool IsSecureConnection => false; // TODO: Fix detection.
         public ConnectionContext Connection { get; }
         public MqttPacketFormatterAdapter PacketFormatterAdapter { get; }
         public event EventHandler ReadingPacketStarted;

Source/MQTTnet.AspnetCore/MqttWebSocketServerAdapter.cs

@@ -38,13 +38,14 @@ namespace MQTTnet.AspNetCore
             if (webSocket == null) throw new ArgumentNullException(nameof(webSocket));
 
             var endpoint = $"{httpContext.Connection.RemoteIpAddress}:{httpContext.Connection.RemotePort}";
-            var channel = new MqttWebSocketChannel(webSocket, endpoint);
-            var clientAdapter = new MqttChannelAdapter(channel, new MqttPacketFormatterAdapter(), _logger.CreateChildLogger(nameof(MqttWebSocketServerAdapter)));
-
+            
             var clientCertificate = await httpContext.Connection.GetClientCertificateAsync().ConfigureAwait(false);
             var isSecureConnection = clientCertificate != null;
             clientCertificate?.Dispose();
 
+            var channel = new MqttWebSocketChannel(webSocket, endpoint, isSecureConnection);
+            var clientAdapter = new MqttChannelAdapter(channel, new MqttPacketFormatterAdapter(), _logger.CreateChildLogger(nameof(MqttWebSocketServerAdapter)));
+
             var eventArgs = new MqttServerAdapterClientAcceptedEventArgs(clientAdapter);
             ClientAcceptedHandler?.Invoke(eventArgs);
 

Source/MQTTnet.Server/Mqtt/MqttConnectionValidator.cs

@@ -26,6 +26,7 @@ namespace MQTTnet.Server.Mqtt
                 {
                     { "client_id", context.ClientId },
                     { "endpoint", context.Endpoint },
+                    { "is_secure_connection", context.IsSecureConnection },
                     { "username", context.Username },
                     { "password", context.Password },
                     { "result", PythonConvert.Pythonfy(context.ReturnCode) }

Source/MQTTnet/Adapter/IMqttChannelAdapter.cs

@@ -10,6 +10,8 @@ namespace MQTTnet.Adapter
     {
         string Endpoint { get; }
 
+        bool IsSecureConnection { get; }
+
         MqttPacketFormatterAdapter PacketFormatterAdapter { get; }
         
         event EventHandler ReadingPacketStarted;

Source/MQTTnet/Adapter/MqttChannelAdapter.cs

@@ -42,6 +42,8 @@ namespace MQTTnet.Adapter
 
         public string Endpoint => _channel.Endpoint;
 
+        public bool IsSecureConnection => _channel.IsSecureConnection;
+
         public MqttPacketFormatterAdapter PacketFormatterAdapter { get; }
 
         public event EventHandler ReadingPacketStarted;

Source/MQTTnet/Channel/IMqttChannel.cs

@@ -7,6 +7,7 @@ namespace MQTTnet.Channel
     public interface IMqttChannel : IDisposable
     {
         string Endpoint { get; }
+        bool IsSecureConnection { get; }
 
         Task ConnectAsync(CancellationToken cancellationToken);
         Task DisconnectAsync(CancellationToken cancellationToken);

Source/MQTTnet/Implementations/MqttClientAdapterFactory.cs

@@ -1,6 +1,5 @@
 using System;
 using MQTTnet.Adapter;
-using MQTTnet.Client;
 using MQTTnet.Client.Options;
 using MQTTnet.Diagnostics;
 using MQTTnet.Formatter;

Source/MQTTnet/Implementations/MqttTcpChannel.Uwp.cs

@@ -36,6 +36,8 @@ namespace MQTTnet.Implementations
             _bufferSize = serverOptions.DefaultEndpointOptions.BufferSize;
 
             CreateStreams();
+
+            IsSecureConnection = socket.Information.ProtectionLevel >= SocketProtectionLevel.Tls12;
         }
 
         public static Func<MqttClientTcpOptions, IEnumerable<ChainValidationResult>> CustomIgnorableServerCertificateErrorsResolver { get; set; }
@@ -53,6 +55,8 @@ namespace MQTTnet.Implementations
             }
         }
 
+        public bool IsSecureConnection { get; }
+
         public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             if (_socket == null)

Source/MQTTnet/Implementations/MqttTcpChannel.cs

@@ -27,6 +27,8 @@ namespace MQTTnet.Implementations
         {
             _clientOptions = clientOptions ?? throw new ArgumentNullException(nameof(clientOptions));
             _options = (MqttClientTcpOptions)clientOptions.ChannelOptions;
+
+            IsSecureConnection = clientOptions.ChannelOptions?.TlsOptions?.UseTls == true;
         }
 
         /// <summary>
@@ -37,6 +39,8 @@ namespace MQTTnet.Implementations
         {
             _socket = socket ?? throw new ArgumentNullException(nameof(socket));
 
+            IsSecureConnection = sslStream != null;
+
             CreateStream(sslStream);
         }
 
@@ -45,6 +49,8 @@ namespace MQTTnet.Implementations
 
         public string Endpoint => _socket?.RemoteEndPoint?.ToString();
 
+        public bool IsSecureConnection { get; }
+
         public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             if (_socket == null)

Source/MQTTnet/Implementations/MqttWebSocketChannel.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using System.Net;
 using System.Net.WebSockets;
 using System.Security.Cryptography.X509Certificates;
@@ -21,14 +22,18 @@ namespace MQTTnet.Implementations
             _options = options ?? throw new ArgumentNullException(nameof(options));
         }
 
-        public MqttWebSocketChannel(WebSocket webSocket, string endpoint)
+        public MqttWebSocketChannel(WebSocket webSocket, string endpoint, bool isSecureConnection)
         {
             _webSocket = webSocket ?? throw new ArgumentNullException(nameof(webSocket));
+
             Endpoint = endpoint;
+            IsSecureConnection = isSecureConnection;
         }
 
         public string Endpoint { get; }
 
+        public bool IsSecureConnection { get; private set; }
+
         public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             var uri = _options.Uri;
@@ -83,6 +88,8 @@ namespace MQTTnet.Implementations
 
             await clientWebSocket.ConnectAsync(new Uri(uri), cancellationToken).ConfigureAwait(false);
             _webSocket = clientWebSocket;
+
+            IsSecureConnection = uri.StartsWith("wss://", StringComparison.OrdinalIgnoreCase);
         }
 
         public async Task DisconnectAsync(CancellationToken cancellationToken)

Source/MQTTnet/Internal/TestMqttChannel.cs

@@ -16,6 +16,8 @@ namespace MQTTnet.Internal
 
         public string Endpoint { get; } = "<Test channel>";
 
+        public bool IsSecureConnection { get; } = false;
+
         public Task ConnectAsync(CancellationToken cancellationToken)
         {
             return Task.FromResult(0);

Source/MQTTnet/Server/MqttClientSessionsManager.cs

@@ -298,7 +298,8 @@ namespace MQTTnet.Server
                 connectPacket.Username,
                 connectPacket.Password,
                 connectPacket.WillMessage,
-                clientAdapter.Endpoint);
+                clientAdapter.Endpoint,
+                clientAdapter.IsSecureConnection);
 
             var connectionValidator = _options.ConnectionValidator;
 

Source/MQTTnet/Server/MqttConnectionValidatorContext.cs

@@ -4,13 +4,14 @@ namespace MQTTnet.Server
 {
     public class MqttConnectionValidatorContext
     {
-        public MqttConnectionValidatorContext(string clientId, string username, string password, MqttApplicationMessage willMessage, string endpoint)
+        public MqttConnectionValidatorContext(string clientId, string username, string password, MqttApplicationMessage willMessage, string endpoint, bool isSecureConnection)
         {
             ClientId = clientId;
             Username = username;
             Password = password;
             WillMessage = willMessage;
             Endpoint = endpoint;
+            IsSecureConnection = isSecureConnection;
         }
 
         public string ClientId { get; }
@@ -23,6 +24,8 @@ namespace MQTTnet.Server
 
         public string Endpoint { get; }
 
+        public bool IsSecureConnection { get; }
+
         public MqttConnectReturnCode ReturnCode { get; set; } = MqttConnectReturnCode.ConnectionAccepted;
     }
 }