5d62604582
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294 lines
12 KiB
Haskell
294 lines
12 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Tunnel
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( runClient
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, runServer
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, rrunTCPClient
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) where
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import ClassyPrelude
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import Data.Maybe (fromJust)
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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 Control.Monad.Except
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import qualified Network.Connection as NC
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import System.IO (IOMode (ReadWriteMode))
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import qualified Data.ByteString.Base64 as B64
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import Types
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import Protocols
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import qualified Socks5
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import Logger
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import qualified Credentials
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rrunTCPClient :: N.ClientSettings -> (Connection -> IO a) -> IO a
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rrunTCPClient cfg app = bracket
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(do
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(s,addr) <- N.getSocketFamilyTCP (N.getHost cfg) (N.getPort cfg) (N.getAddrFamily cfg)
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N.setSocketOption s N.RecvBuffer defaultRecvBufferSize
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N.setSocketOption s N.SendBuffer defaultSendBufferSize
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so_mark_val <- readIORef sO_MARK_Value
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when (so_mark_val /= 0 && N.isSupportedSocketOption sO_MARK) (N.setSocketOption s sO_MARK so_mark_val)
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return (s,addr)
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)
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(\r -> catch (N.close $ fst r) (\(_ :: SomeException) -> return ()))
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(\(s, _) -> app Connection
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{ read = Just <$> N.safeRecv s defaultRecvBufferSize
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, write = N.sendAll s
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, close = N.close s
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, rawConnection = Just s
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})
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--
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-- Pipes
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--
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tunnelingClientP :: MonadError Error m => TunnelSettings -> (Connection -> IO (m ())) -> (Connection -> IO (m ()))
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tunnelingClientP cfg@TunnelSettings{..} app conn = onError $ do
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debug "Oppening Websocket stream"
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stream <- connectionToStream conn
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let headers = (if not (null upgradeCredentials) then [("Authorization", "Basic " <> B64.encode upgradeCredentials)] else [])
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<> (if not (null hostHeader) then [("Host", hostHeader)] else [])
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ret <- WS.runClientWithStream stream serverHost (toPath cfg) WS.defaultConnectionOptions headers run
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debug "Closing Websocket stream"
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return ret
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where
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connectionToStream Connection{..} = WS.makeStream read (write . toStrict . fromJust)
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onError = flip catch (\(e :: SomeException) -> return . throwError . WebsocketError $ show e)
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run cnx = do
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WS.forkPingThread cnx websocketPingFrequencySec
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app (toConnection cnx)
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tlsClientP :: MonadError Error m => TunnelSettings -> (Connection -> IO (m ())) -> (Connection -> IO (m ()))
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tlsClientP TunnelSettings{..} app conn = onError $ do
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debug "Doing tls Handshake"
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context <- NC.initConnectionContext
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let socket = fromJust $ rawConnection conn
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h <- N.socketToHandle socket ReadWriteMode
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connection <- NC.connectFromHandle context h connectionParams
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ret <- app (toConnection connection) `finally` hClose h
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debug "Closing TLS"
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return ret
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where
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onError = flip catch (\(e :: SomeException) -> return . throwError . TlsError $ show e)
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tlsSettings = NC.TLSSettingsSimple { NC.settingDisableCertificateValidation = True
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, NC.settingDisableSession = False
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, NC.settingUseServerName = False
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}
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connectionParams = NC.ConnectionParams { NC.connectionHostname = if tlsSNI == mempty then serverHost else BC.unpack tlsSNI
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, NC.connectionPort = serverPort
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, NC.connectionUseSecure = Just tlsSettings
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, NC.connectionUseSocks = Nothing
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}
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--
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-- Connectors
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--
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tcpConnection :: MonadError Error m => TunnelSettings -> (Connection -> IO (m ())) -> IO (m ())
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tcpConnection TunnelSettings{..} app = onError $ do
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debug $ "Oppening tcp connection to " <> fromString serverHost <> ":" <> show (fromIntegral serverPort :: Int)
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ret <- rrunTCPClient (N.clientSettingsTCP (fromIntegral serverPort) (fromString serverHost)) app
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debug $ "Closing tcp connection to " <> fromString serverHost <> ":" <> show (fromIntegral serverPort :: Int)
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return ret
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where
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onError = flip catch (\(e :: SomeException) -> return $ when (take 10 (show e) == "user error") (throwError $ TunnelError $ show e))
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httpProxyConnection :: MonadError Error m => TunnelSettings -> (Connection -> IO (m ())) -> IO (m ())
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httpProxyConnection TunnelSettings{..} app = onError $ do
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let settings = fromJust proxySetting
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debug $ "Oppening tcp connection to proxy " <> show settings
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ret <- rrunTCPClient (N.clientSettingsTCP (fromIntegral (port settings)) (BC.pack $ host settings)) $ \conn -> do
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_ <- sendConnectRequest settings conn
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responseM <- timeout (1000000 * 10) $ readConnectResponse mempty conn
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let response = fromMaybe "No response of the proxy after 10s" responseM
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if isAuthorized response
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then app conn
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else return . throwError . ProxyForwardError $ BC.unpack response
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debug $ "Closing tcp connection to proxy " <> show settings
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return ret
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where
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credentialsToHeader (user, password) = "Proxy-Authorization: Basic " <> B64.encode (user <> ":" <> password) <> "\r\n"
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sendConnectRequest settings h = write h $ "CONNECT " <> fromString serverHost <> ":" <> fromString (show serverPort) <> " HTTP/1.0\r\n"
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<> "Host: " <> fromString serverHost <> ":" <> fromString (show serverPort) <> "\r\n"
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<> maybe mempty credentialsToHeader (credentials settings)
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<> "\r\n"
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readConnectResponse buff conn = do
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response <- fromJust <$> read conn
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if "\r\n\r\n" `BC.isInfixOf` response
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then return $ buff <> response
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else readConnectResponse (buff <> response) conn
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isAuthorized response = " 200 " `BC.isInfixOf` response
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onError = flip catch (\(e :: SomeException) -> return $ when (take 10 (show e) == "user error") (throwError $ ProxyConnectionError $ show e))
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--
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-- Client
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--
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runClient :: TunnelSettings -> IO ()
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runClient cfg@TunnelSettings{..} = do
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let withEndPoint = if isJust proxySetting then httpProxyConnection cfg else tcpConnection cfg
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let doTlsIf tlsNeeded app = if tlsNeeded then tlsClientP cfg app else app
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let withTunnel cfg' app = withEndPoint (doTlsIf useTls . tunnelingClientP cfg' $ app)
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let app cfg' localH = do
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ret <- withTunnel cfg' $ \remoteH -> do
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ret <- remoteH <==> toConnection localH
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info $ "CLOSE tunnel :: " <> show cfg'
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return ret
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handleError ret
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case protocol of
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UDP -> runUDPServer (localBind, localPort) udpTimeout (app cfg)
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TCP -> runTCPServer (localBind, localPort) (app cfg)
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STDIO -> runSTDIOServer (app cfg)
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SOCKS5 -> runSocks5Server (Socks5.ServerSettings localPort localBind) cfg app
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--
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-- Server
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--
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runTlsTunnelingServer :: (HostName, PortNumber) -> ((ByteString, Int) -> Bool) -> IO ()
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runTlsTunnelingServer endPoint@(bindTo, portNumber) isAllowed = do
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info $ "WAIT for TLS connection on " <> toStr endPoint
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N.runTCPServerTLS (N.tlsConfigBS (fromString bindTo) (fromIntegral portNumber) Credentials.certificate Credentials.key) $ \sClient ->
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runApp sClient WS.defaultConnectionOptions (serverEventLoop (N.appSockAddr sClient) isAllowed)
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info "SHUTDOWN 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 (N.appRead appData <&> \payload -> if payload == mempty then Nothing else Just payload) (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 endPoint@(host, port) isAllowed = do
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info $ "WAIT for connection on " <> toStr endPoint
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let srvSet = N.setReadBufferSize defaultRecvBufferSize $ N.serverSettingsTCP (fromIntegral port) (fromString host)
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void $ N.runTCPServer srvSet $ \sClient -> do
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stream <- WS.makeStream (N.appRead sClient <&> \payload -> if payload == mempty then Nothing else Just payload) (N.appWrite sClient . toStrict . fromJust)
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runApp stream WS.defaultConnectionOptions (serverEventLoop (N.appSockAddr sClient) isAllowed)
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info "CLOSE server"
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where
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runApp :: WS.Stream -> WS.ConnectionOptions -> WS.ServerApp -> IO ()
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runApp socket opts = bracket (WS.makePendingConnectionFromStream socket opts)
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(\conn -> catch (WS.close $ WS.pendingStream conn) (\(_ :: SomeException) -> return ()))
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serverEventLoop :: N.SockAddr -> ((ByteString, Int) -> Bool) -> WS.PendingConnection -> IO ()
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serverEventLoop sClient isAllowed pendingConn = do
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let path = fromPath . WS.requestPath $ WS.pendingRequest pendingConn
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let forwardedFor = filter (\(header,val) -> header == "x-forwarded-for") $ WS.requestHeaders $ WS.pendingRequest pendingConn
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info $ "NEW incoming connection from " <> show sClient <> " " <> show forwardedFor
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case path of
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Nothing -> info "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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info "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 -> void $ toConnection conn <==> toConnection cnx)
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TCP -> runTCPClient (BC.unpack rhost, fromIntegral rport) (\cnx -> void $ toConnection conn <==> toConnection cnx)
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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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--
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-- Commons
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--
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toPath :: TunnelSettings -> String
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toPath TunnelSettings{..} = "/" <> upgradePrefix <> "/"
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<> toLower (show $ if protocol == UDP then UDP else TCP)
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<> "/" <> 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 == 4)
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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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handleError :: Either Error () -> IO ()
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handleError (Right ()) = return ()
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handleError (Left errMsg) =
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case errMsg of
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ProxyConnectionError msg -> err "Cannot connect to the proxy" >> debugPP msg
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ProxyForwardError msg -> err "Connection not allowed by the proxy" >> debugPP msg
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TunnelError msg -> err "Cannot establish the connection to the server" >> debugPP msg
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LocalServerError msg -> err "Cannot create the localServer, port already binded ?" >> debugPP msg
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WebsocketError msg -> err "Cannot establish websocket connection with the server" >> debugPP msg
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TlsError msg -> err "Cannot do tls handshake with the server" >> debugPP msg
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Other msg -> debugPP msg
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where
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debugPP msg = debug $ "====\n" <> msg <> "\n===="
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myTry :: MonadError Error m => IO a -> IO (m ())
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myTry f = either (\(e :: SomeException) -> throwError . Other $ show e) (const $ return ()) <$> try f
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(<==>) :: Connection -> Connection -> IO (Either Error ())
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(<==>) 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 = forever $ read hTunnel >>= write hOther . fromJust
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propagateWrites :: Connection -> Connection -> IO ()
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propagateWrites hTunnel hOther = 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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