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109
src/Protocols.hs
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109
src/Protocols.hs
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{-# LANGUAGE DeriveAnyClass #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE StandaloneDeriving #-}
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module Protocols where
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import ClassyPrelude
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import Control.Concurrent (forkIO)
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import qualified Data.HashMap.Strict as H
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import System.Timeout (timeout)
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import qualified Data.ByteString.Char8 as BC
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import qualified Data.Streaming.Network as N
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import Network.Socket (HostName, PortNumber)
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import qualified Network.Socket as N hiding (recv, recvFrom, send,
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sendTo)
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import qualified Network.Socket.ByteString as N
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deriving instance Generic PortNumber
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deriving instance Hashable PortNumber
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deriving instance Generic N.SockAddr
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deriving instance Hashable N.SockAddr
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data Protocol = UDP | TCP deriving (Show, Read)
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data UdpAppData = UdpAppData
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{ appAddr :: N.SockAddr
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, appSem :: MVar ByteString
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, appRead :: IO ByteString
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, appWrite :: ByteString -> IO ()
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}
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instance N.HasReadWrite UdpAppData where
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readLens f appData = fmap (\getData -> appData { appRead = getData}) (f $ appRead appData)
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writeLens f appData = fmap (\writeData -> appData { appWrite = writeData}) (f $ appWrite appData)
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runTCPServer :: (HostName, PortNumber) -> (N.AppData -> IO ()) -> IO ()
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runTCPServer (host, port) app = do
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putStrLn $ "WAIT for connection on " <> fromString host <> ":" <> tshow port
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void $ N.runTCPServer (N.serverSettingsTCP (fromIntegral port) (fromString host)) app
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putStrLn "CLOSE tunnel"
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runTCPClient :: (HostName, PortNumber) -> (N.AppData -> IO ()) -> IO ()
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runTCPClient (host, port) app = do
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putStrLn $ "CONNECTING to " <> fromString host <> ":" <> tshow port
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void $ N.runTCPClient (N.clientSettingsTCP (fromIntegral port) (BC.pack host)) app
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putStrLn $ "CLOSE connection to " <> fromString host <> ":" <> tshow port
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runUDPClient :: (HostName, PortNumber) -> (UdpAppData -> IO ()) -> IO ()
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runUDPClient (host, port) app = do
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putStrLn $ "CONNECTING to " <> fromString host <> ":" <> tshow port
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bracket (N.getSocketUDP host (fromIntegral port)) (N.close . fst) $ \(socket, addrInfo) -> do
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sem <- newEmptyMVar
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app UdpAppData { appAddr = N.addrAddress addrInfo
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, appSem = sem
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, appRead = fst <$> N.recvFrom socket 4096
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, appWrite = \payload -> void $ N.sendTo socket payload (N.addrAddress addrInfo)
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}
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putStrLn $ "CLOSE connection to " <> fromString host <> ":" <> tshow port
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runUDPServer :: (HostName, PortNumber) -> (UdpAppData -> IO ()) -> IO ()
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runUDPServer (host, port) app = do
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putStrLn $ "WAIT for datagrames on " <> fromString host <> ":" <> tshow port
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clientsCtx <- newIORef mempty
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void $ bracket (N.bindPortUDP (fromIntegral port) (fromString host)) N.close (runEventLoop clientsCtx)
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putStrLn "CLOSE tunnel"
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where
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addNewClient :: IORef (H.HashMap N.SockAddr UdpAppData) -> N.Socket -> N.SockAddr -> ByteString -> IO UdpAppData
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addNewClient clientsCtx socket addr payload = do
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sem <- newMVar payload
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let appData = UdpAppData { appAddr = addr
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, appSem = sem
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, appRead = takeMVar sem
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, appWrite = \payload' -> void $ N.sendTo socket payload' addr
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}
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void $ atomicModifyIORef' clientsCtx (\clients -> (H.insert addr appData clients, ()))
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return appData
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removeClient :: IORef (H.HashMap N.SockAddr UdpAppData) -> UdpAppData -> IO ()
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removeClient clientsCtx clientCtx = do
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void $ atomicModifyIORef' clientsCtx (\clients -> (H.delete (appAddr clientCtx) clients, ()))
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putStrLn "TIMEOUT connection"
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pushDataToClient :: UdpAppData -> ByteString -> IO ()
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pushDataToClient clientCtx = putMVar (appSem clientCtx)
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runEventLoop :: IORef (H.HashMap N.SockAddr UdpAppData) -> N.Socket -> IO ()
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runEventLoop clientsCtx socket = forever $ do
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(payload, addr) <- N.recvFrom socket 4096
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clientCtx <- H.lookup addr <$> readIORef clientsCtx
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case clientCtx of
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Just clientCtx' -> pushDataToClient clientCtx' payload
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_ -> void . forkIO $ bracket
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(addNewClient clientsCtx socket addr payload)
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(removeClient clientsCtx)
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(void . timeout (30 * 10^(6 :: Int)) . app)
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232
src/Tunnel.hs
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232
src/Tunnel.hs
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{-# LANGUAGE BangPatterns #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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module Tunnel
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( runClient
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, runServer
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, TunnelSettings(..)
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, Protocol(..)
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) where
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import ClassyPrelude
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import Control.Concurrent.Async (async, race_)
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import qualified Data.HashMap.Strict as H
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import Data.Maybe (fromJust)
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import System.Timeout (timeout)
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import qualified Data.ByteString.Char8 as BC
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import qualified Data.Conduit.Network.TLS as N
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import qualified Data.Streaming.Network as N
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import Network.Socket (HostName, PortNumber)
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import qualified Network.Socket as N hiding (recv, recvFrom,
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send, sendTo)
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import qualified Network.Socket.ByteString as N
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import qualified Network.WebSockets as WS
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import qualified Network.WebSockets.Connection as WS
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import qualified Network.WebSockets.Stream as WS
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import Network.Connection (settingDisableCertificateValidation)
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import Protocols
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data TunnelSettings = TunnelSettings
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{ localBind :: HostName
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, localPort :: PortNumber
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, serverHost :: HostName
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, serverPort :: PortNumber
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, destHost :: HostName
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, destPort :: PortNumber
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, protocol :: Protocol
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, useTls :: Bool
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}
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instance Show TunnelSettings where
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show TunnelSettings{..} = localBind <> ":" <> show localPort
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<> " <==" <> (if useTls then "WSS" else "WS") <> "==> "
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<> serverHost <> ":" <> show serverPort
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<> " <==" <> show protocol <> "==> " <> destHost <> ":" <> show destPort
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data Connection = Connection
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{ read :: IO (Maybe ByteString)
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, write :: ByteString -> IO ()
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, close :: IO ()
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, rawConnection :: Maybe WS.Connection
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}
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class ToConnection a where
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toConnection :: a -> Connection
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instance ToConnection WS.Connection where
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toConnection conn = Connection { read = Just <$> WS.receiveData conn
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, write = WS.sendBinaryData conn
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, close = WS.sendClose conn (mempty :: LByteString)
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, rawConnection = Just conn
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}
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instance ToConnection N.AppData where
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toConnection conn = Connection { read = Just <$> N.appRead conn
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, write = N.appWrite conn
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, close = N.appCloseConnection conn
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, rawConnection = Nothing
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}
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instance ToConnection UdpAppData where
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toConnection conn = Connection { read = Just <$> appRead conn
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, write = appWrite conn
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, close = return ()
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, rawConnection = Nothing
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}
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connectionToStream :: Connection -> IO WS.Stream
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connectionToStream Connection{..} = WS.makeStream read (write . toStrict . fromJust)
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runTunnelingClientWith :: TunnelSettings -> (Connection -> IO ()) -> Connection -> IO ()
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runTunnelingClientWith info@TunnelSettings{..} app conn = do
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putStrLn $ "OPEN tunnel " <> tshow info
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stream <- connectionToStream conn
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void $ WS.runClientWithStream stream serverHost (toPath info) WS.defaultConnectionOptions [] $ \conn' ->
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app (toConnection conn')
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putStrLn $ "CLOSE tunnel " <> tshow info
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tcpConnection :: TunnelSettings -> (Connection -> IO ()) -> IO ()
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tcpConnection info@TunnelSettings{..} app =
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N.runTCPClient (N.clientSettingsTCP (fromIntegral serverPort) (fromString serverHost)) (app . toConnection)
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tlsConnection :: TunnelSettings -> (Connection -> IO ()) -> IO ()
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tlsConnection info@TunnelSettings{..} app = do
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let tlsCfg = N.tlsClientConfig (fromIntegral serverPort) (fromString serverHost)
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let tlsSettings = (N.tlsClientTLSSettings tlsCfg) { settingDisableCertificateValidation = True }
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N.runTLSClient (tlsCfg { N.tlsClientTLSSettings = tlsSettings } ) (app . toConnection)
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runTlsTunnelingServer :: (HostName, PortNumber) -> ((ByteString, Int) -> Bool) -> IO ()
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runTlsTunnelingServer (bindTo, portNumber) isAllowed = do
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putStrLn $ "WAIT for TLS connection on " <> fromString bindTo <> ":" <> tshow portNumber
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N.runTCPServerTLS (N.tlsConfigBS (fromString bindTo) (fromIntegral portNumber) serverCertificate serverKey) $ \sClient ->
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runApp sClient WS.defaultConnectionOptions (serverEventLoop isAllowed)
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putStrLn "CLOSE server"
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where
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runApp :: N.AppData -> WS.ConnectionOptions -> WS.ServerApp -> IO ()
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runApp appData opts app= do
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stream <- WS.makeStream (Just <$> N.appRead appData) (N.appWrite appData . toStrict . fromJust)
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bracket (WS.makePendingConnectionFromStream stream opts)
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(\conn -> catch (WS.close $ WS.pendingStream conn) (\(_ :: SomeException) -> return ()))
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app
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runTunnelingServer :: (HostName, PortNumber) -> ((ByteString, Int) -> Bool) -> IO ()
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runTunnelingServer (host, port) isAllowed = do
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putStrLn $ "WAIT for connection on " <> fromString host <> ":" <> tshow port
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void $ N.runTCPServer (N.serverSettingsTCP (fromIntegral port) (fromString host)) $ \sClient ->
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runApp (fromJust $ N.appRawSocket sClient) WS.defaultConnectionOptions (serverEventLoop isAllowed)
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putStrLn "CLOSE server"
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where
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runApp :: N.Socket -> WS.ConnectionOptions -> WS.ServerApp -> IO ()
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runApp socket opts = bracket (WS.makePendingConnection socket opts)
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(\conn -> catch (WS.close $ WS.pendingStream conn) (\(_ :: SomeException) -> return ()))
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serverEventLoop :: ((ByteString, Int) -> Bool) -> WS.PendingConnection -> IO ()
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serverEventLoop isAllowed pendingConn = do
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let path = fromPath . WS.requestPath $ WS.pendingRequest pendingConn
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case path of
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Nothing -> putStrLn "Rejecting connection" >> WS.rejectRequest pendingConn "Invalid tunneling information"
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Just (!proto, !rhost, !rport) ->
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if not $ isAllowed (rhost, rport)
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then do
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putStrLn "Rejecting tunneling"
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WS.rejectRequest pendingConn "Restriction is on, You cannot request this tunneling"
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else do
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conn <- WS.acceptRequest pendingConn
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case proto of
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UDP -> runUDPClient (BC.unpack rhost, fromIntegral rport) (\cnx -> toConnection conn `propagateRW` toConnection cnx)
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TCP -> runTCPClient (BC.unpack rhost, fromIntegral rport) (\cnx -> toConnection conn `propagateRW` toConnection cnx)
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propagateRW :: Connection -> Connection -> IO ()
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propagateRW hTunnel hOther =
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myTry $ race_ (propagateReads hTunnel hOther) (propagateWrites hTunnel hOther)
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propagateReads :: Connection -> Connection -> IO ()
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propagateReads hTunnel hOther = myTry (forever $ read hTunnel >>= write hOther . fromJust)
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propagateWrites :: Connection -> Connection -> IO ()
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propagateWrites hTunnel hOther = myTry $ do
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payload <- fromJust <$> read hOther
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unless (null payload) (write hTunnel payload >> propagateWrites hTunnel hOther)
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myTry :: IO () -> IO ()
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myTry f = void $ catch f (\(_ :: SomeException) -> return ())
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runClient :: TunnelSettings -> IO ()
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runClient cfg@TunnelSettings{..} = do
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let out app = (if useTls then tlsConnection cfg else tcpConnection cfg) (runTunnelingClientWith cfg app)
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case protocol of
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UDP -> runUDPServer (localBind, localPort) (\hOther -> out (`propagateRW` toConnection hOther))
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TCP -> runTCPServer (localBind, localPort) (\hOther -> out (`propagateRW` toConnection hOther))
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runServer :: Bool -> (HostName, PortNumber) -> ((ByteString, Int) -> Bool) -> IO ()
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runServer useTLS = if useTLS then runTlsTunnelingServer else runTunnelingServer
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toPath :: TunnelSettings -> String
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toPath TunnelSettings{..} = "/" <> toLower (show protocol) <> "/" <> destHost <> "/" <> show destPort
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fromPath :: ByteString -> Maybe (Protocol, ByteString, Int)
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fromPath path = let rets = BC.split '/' . BC.drop 1 $ path
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in do
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guard (length rets == 3)
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let [protocol, h, prt] = rets
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prt' <- readMay . BC.unpack $ prt :: Maybe Int
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proto <- readMay . toUpper . BC.unpack $ protocol :: Maybe Protocol
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return (proto, h, prt')
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-- openssl genrsa 512 > host.key
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-- openssl req -new -x509 -nodes -sha1 -days 9999 -key host.key > host.cert
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serverKey :: ByteString
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serverKey = "-----BEGIN RSA PRIVATE KEY-----\n" <>
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"MIIBOgIBAAJBAMEEloIcF3sTGYhQmybyDm1NOpXmf94rR1fOwENjuW6jh4WTaz5k\n" <>
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"Uew8CR58e7c5GgK08ZOJwi2Hpl9MfDm4mGUCAwEAAQJAGP+nHqLUx7PpkqYd8iVX\n" <>
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"iQB/nfqEhRnF27GDZTb9RT7e3bR7X1B9oIBnpmqwMG5oPxidoIKv+jzZjsQcxKLu\n" <>
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"4QIhAPdcPmFrtLUpTXx21wtVxotsO7+YcQxtRtBoXeiREUInAiEAx8Jx9a6eVRIh\n" <>
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"slSTJMPuy/LbvK8VUTqtx9x2EhFhBJMCIQC68qlmwZs6y/N3HO4b8AD1gKCLhm/y\n" <>
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"P2ikvCw1R+ZuQwIgdfcgMUPzgK16dMN5OabzaEF8/kouvo92fKZ2m2jj8D0CIFY8\n" <>
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"4SkXDkpeUEKKfxHqrEkkxmpRk93Ui1NPyN+wxrgO\n" <>
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"-----END RSA PRIVATE KEY-----"
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serverCertificate :: ByteString
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serverCertificate = "-----BEGIN CERTIFICATE-----\n" <>
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"MIICXTCCAgegAwIBAgIJAJf1Sm7DI0KcMA0GCSqGSIb3DQEBBQUAMIGJMQswCQYD\n" <>
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"VQQGEwJGUjESMBAGA1UECAwJQXF1aXRhaW5lMRAwDgYDVQQHDAdCYXlvbm5lMQ4w\n" <>
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"DAYDVQQKDAVFcmViZTELMAkGA1UECwwCSVQxFjAUBgNVBAMMDXJvbWFpbi5nZXJh\n" <>
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"cmQxHzAdBgkqhkiG9w0BCQEWEHdoeW5vdEBnbWFpbC5jb20wHhcNMTYwNTIxMTUy\n" <>
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"MzIyWhcNNDMxMDA2MTUyMzIyWjCBiTELMAkGA1UEBhMCRlIxEjAQBgNVBAgMCUFx\n" <>
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"dWl0YWluZTEQMA4GA1UEBwwHQmF5b25uZTEOMAwGA1UECgwFRXJlYmUxCzAJBgNV\n" <>
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"BAsMAklUMRYwFAYDVQQDDA1yb21haW4uZ2VyYXJkMR8wHQYJKoZIhvcNAQkBFhB3\n" <>
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"aHlub3RAZ21haWwuY29tMFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAMEEloIcF3sT\n" <>
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"GYhQmybyDm1NOpXmf94rR1fOwENjuW6jh4WTaz5kUew8CR58e7c5GgK08ZOJwi2H\n" <>
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"pl9MfDm4mGUCAwEAAaNQME4wHQYDVR0OBBYEFLY0HsQst1t3QRXU0aTWg3V1IvGX\n" <>
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"MB8GA1UdIwQYMBaAFLY0HsQst1t3QRXU0aTWg3V1IvGXMAwGA1UdEwQFMAMBAf8w\n" <>
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"DQYJKoZIhvcNAQEFBQADQQCP4oYOIrX7xvmQih3hvF4kUnbKjtttImdGruonsLAz\n" <>
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"OL2VExC6OqlDP2yu14BlsjTt+X2v6mhHnSM16c6AkpM/\n" <>
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"-----END CERTIFICATE-----"
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