public TorSocks5Handler(IPEndPoint torSocks5EndPoint)
{
Guard.NotNull(nameof(torSocks5EndPoint), torSocks5EndPoint);
TorSocks5Manager = new TorSocks5Manager(torSocks5EndPoint);
Connections = new ConcurrentDictionary <TorSocks5Client, AsyncLock>();
ConnectLock = new AsyncLock();
DisposeRequestLock = new AsyncReaderWriterLock();
TorControlClient.CircuitChangeRequested += Client_CircuitChangeRequestedAsync;
}
private async Task <TorSocks5Client> SendAsync(HttpRequestMessage request, string host, IDisposable connectLockTask, KeyValuePair <TorSocks5Client, AsyncLock> clientLockPair, AsyncLock clientLock, CancellationToken cancel)
{
TorSocks5Client client = null;
try
{
// https://tools.ietf.org/html/rfc7230#section-2.6
// Intermediaries that process HTTP messages (i.e., all intermediaries
// other than those acting as tunnels) MUST send their own HTTP - version
// in forwarded messages.
request.Version = HttpProtocol.HTTP11.Version;
client = clientLockPair.Key;
if (client != null && (!client.IsConnected || !RuntimeInformation.IsOSPlatform(OSPlatform.Windows))) // Linux and OSX bug, this line only works if LinuxOsxLock is in effect
{
Connections.TryRemove(client, out AsyncLock al);
client?.Dispose();
}
if (client == null || !client.IsConnected)
{
cancel.ThrowIfCancellationRequested();
client = await TorSocks5Manager.EstablishTcpConnectionAsync(host, request.RequestUri.Port, isolateStream : true, cancel : cancel).ConfigureAwait(false);
cancel.ThrowIfCancellationRequested();
Stream stream = client.TcpClient.GetStream();
if (request.RequestUri.Scheme.Equals("https", StringComparison.Ordinal))
{
SslStream sslStream;
// On Linux and OSX ignore certificate, because of a .NET Core bug
// This is a security vulnerability, has to be fixed as soon as the bug get fixed
// Details:
// https://github.com/dotnet/corefx/issues/21761
// https://github.com/nopara73/DotNetTor/issues/4
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
sslStream = new SslStream(
stream,
leaveInnerStreamOpen: true);
}
else
{
sslStream = new SslStream(
stream,
leaveInnerStreamOpen: true,
userCertificateValidationCallback: (a, b, c, d) => true);
}
await sslStream
.AuthenticateAsClientAsync(
host,
new X509CertificateCollection(),
SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12,
checkCertificateRevocation : true)
.ConfigureAwait(false);
stream = sslStream;
}
client.Stream = stream;
Connections.TryAdd(client, clientLock);
}
connectLockTask?.Dispose();
cancel.ThrowIfCancellationRequested();
// https://tools.ietf.org/html/rfc7230#section-3.3.2
// A user agent SHOULD send a Content - Length in a request message when
// no Transfer-Encoding is sent and the request method defines a meaning
// for an enclosed payload body.For example, a Content - Length header
// field is normally sent in a POST request even when the value is 0
// (indicating an empty payload body).A user agent SHOULD NOT send a
// Content - Length header field when the request message does not contain
// a payload body and the method semantics do not anticipate such a
// body.
// TODO implement it fully (altough probably .NET already ensures it)
if (request.Method == HttpMethod.Post)
{
if (request.Headers.TransferEncoding.Count == 0)
{
if (request.Content == null)
{
request.Content = new ByteArrayContent(new byte[] { }); // dummy empty content
request.Content.Headers.ContentLength = 0;
}
else
{
if (request.Content.Headers.ContentLength == null)
{
request.Content.Headers.ContentLength = (await request.Content.ReadAsStringAsync().ConfigureAwait(false)).Length;
cancel.ThrowIfCancellationRequested();
}
}
}
}
var requestString = await request.ToHttpStringAsync().ConfigureAwait(false);
cancel.ThrowIfCancellationRequested();
var bytes = Encoding.UTF8.GetBytes(requestString);
try
{
await client.Stream.WriteAsync(bytes, 0, bytes.Length, cancel).ConfigureAwait(false);
cancel.ThrowIfCancellationRequested();
}
catch (NullReferenceException ex) // dotnet brainfart
{
Logger.LogTrace <TorSocks5Handler>(ex);
throw new OperationCanceledException();
}
await client.Stream.FlushAsync(cancel).ConfigureAwait(false);
cancel.ThrowIfCancellationRequested();
return(client);
}
catch (OperationCanceledException)
{
client?.Dispose();
throw;
}
catch (Exception ex)
{
Logger.LogTrace <TorSocks5Handler>(ex);
client?.Dispose();
cancel.ThrowIfCancellationRequested();
throw;
}
}