SSH.NET/test/Renci.SshNet.Tests/Classes/SessionTest_Connecting_ServerSendsIgnoreMessageBeforeKexInit_StrictKex.cs

using System.Net.Sockets;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Renci.SshNet.Common;
using Renci.SshNet.Messages.Transport;

namespace Renci.SshNet.Tests.Classes
{
    [TestClass]
    public class SessionTest_Connecting_ServerSendsIgnoreMessageBeforeKexInit_StrictKex : SessionTest_ConnectingBase
    {
        protected override bool ServerSupportsStrictKex
        {
            get
            {
                return true;
            }
        }

        protected override void ActionBeforeKexInit()
        {
            var ignoreMessage = new IgnoreMessage();
            var ignore = ignoreMessage.GetPacket(8, null);

            // MitM sends ignore message to client
            _ = ServerSocket.Send(ignore, 4, ignore.Length - 4, SocketFlags.None);

            // MitM drops server message
            ServerOutboundPacketSequence++;
        }

        [TestMethod]
        public void ShouldThrowSshConnectionException()
        {
            var exception = Assert.ThrowsExactly<SshConnectionException>(Session.Connect);
            Assert.AreEqual(DisconnectReason.KeyExchangeFailed, exception.DisconnectReason);
            Assert.AreEqual("KEXINIT was not the first packet during strict key exchange.", exception.Message);
        }
    }
}