happstack-server-tls-6.0.0: src/Happstack/Server/Internal/TLS.hs
{-# LANGUAGE CPP, ScopedTypeVariables #-}
{- | core functions and types for HTTPS support
-}
module Happstack.Server.Internal.TLS where
import Control.Concurrent (forkIO, killThread, myThreadId)
import Control.Exception (finally)
import Control.Exception.Extensible as E
import Control.Monad (forever, when)
import Data.Time (UTCTime)
import Happstack.Server.Internal.Listen (listenOn)
import Happstack.Server.Internal.Handler (request)
import Happstack.Server.Internal.Socket (acceptLite)
import Happstack.Server.Internal.TimeoutManager (cancel, initialize, register)
import Happstack.Server.Internal.TimeoutSocketTLS as TSS
import Happstack.Server.Internal.Types (Request, Response)
import Network.Socket (HostName, PortNumber, Socket, getSocketName, sClose, socketPort)
import OpenSSL (withOpenSSL)
import OpenSSL.Session (SSL, SSLContext)
import qualified OpenSSL.Session as SSL
import Happstack.Server.Internal.TimeoutIO (TimeoutIO(toHandle, toShutdown))
import Happstack.Server.Types (LogAccess, logMAccess)
import System.IO.Error (isFullError)
import System.Log.Logger (Priority(..), logM)
#ifndef mingw32_HOST_OS
import System.Posix.Signals (Handler(Ignore), installHandler, openEndedPipe)
#endif
-- | wrapper around 'logM' for this module
log':: Priority -> String -> IO ()
log' = logM "Happstack.Server.Internal.TLS"
-- | configuration for using https:\/\/
data TLSConf = TLSConf {
tlsPort :: Int -- port (usually 443)
, tlsCert :: FilePath -- path to SSL certificate
, tlsKey :: FilePath -- path to SSL private key
, tlsTimeout :: Int -- kill connect of timeout (in seconds)
, tlsLogAccess :: Maybe (LogAccess UTCTime) -- see 'logMAccess'
, tlsValidator :: Maybe (Response -> IO Response) -- ^ a function to validate the output on-the-fly
}
-- | a partially complete 'TLSConf' . You must sete 'tlsCert' and 'tlsKey' at a mininum.
nullTLSConf :: TLSConf
nullTLSConf =
TLSConf { tlsPort = 443
, tlsCert = ""
, tlsKey = ""
, tlsTimeout = 30
, tlsLogAccess = Just logMAccess
, tlsValidator = Nothing
}
-- | record that holds the 'Socket' and 'SSLContext' needed to start
-- the https:\/\/ event loop. Used with 'simpleHTTPWithSocket''
--
-- see also: 'httpOnSocket'
data HTTPS = HTTPS
{ httpsSocket :: Socket
, sslContext :: SSLContext
}
-- | generate the 'HTTPS' record needed to start the https:\/\/ event loop
--
httpsOnSocket :: FilePath -- ^ path to ssl certificate
-> FilePath -- ^ path to ssl private key
-> Socket -- ^ listening socket (on which listen() has been called, but not accept())
-> IO HTTPS
httpsOnSocket cert key socket =
do ctx <- SSL.context
SSL.contextSetPrivateKeyFile ctx key
SSL.contextSetCertificateFile ctx cert
SSL.contextSetDefaultCiphers ctx
b <- SSL.contextCheckPrivateKey ctx
when (not b) $ error $ "OpenTLS certificate and key do not match."
return (HTTPS socket ctx)
-- | accept a TLS connection
acceptTLS :: HTTPS -> IO (SSL, HostName, PortNumber)
acceptTLS (HTTPS sck' ctx) =
do -- do normal accept
(sck, peer, port) <- acceptLite sck'
-- then TLS accept
ssl <- SSL.connection ctx sck
SSL.accept ssl
return (ssl, peer, port)
-- | https:// 'Request'/'Response' loop
--
-- This function initializes SSL, and starts accepting and handling
-- 'Request's and sending 'Respone's.
--
-- Each 'Request' is processed in a separate thread.
listenTLS :: TLSConf -- ^ tls configuration
-> (Request -> IO Response) -- ^ request handler
-> IO ()
listenTLS tlsConf hand =
do withOpenSSL $ return ()
tlsSocket <- listenOn (tlsPort tlsConf)
https <- httpsOnSocket (tlsCert tlsConf) (tlsKey tlsConf) tlsSocket
listenTLS' (tlsTimeout tlsConf) (tlsLogAccess tlsConf) tlsSocket https hand
-- | low-level https:// 'Request'/'Response' loop
--
-- This is the low-level loop that reads 'Request's and sends
-- 'Respone's. It assumes that SSL has already been initialized and
-- that socket is listening.
--
-- Each 'Request' is processed in a separate thread.
--
-- see also: 'listenTLS'
listenTLS' :: Int -> Maybe (LogAccess UTCTime) -> Socket -> HTTPS -> (Request -> IO Response) -> IO ()
listenTLS' timeout mlog socket https hand = do
#ifndef mingw32_HOST_OS
installHandler openEndedPipe Ignore Nothing
#endif
tm <- initialize (timeout * (10^(6 :: Int)))
do let work :: (SSL, HostName, PortNumber) -> IO ()
work (ssl, hn, p) =
do tid <- myThreadId
thandle <- register tm $ do SSL.shutdown ssl SSL.Unidirectional `E.catch` ignoreSSLException
killThread tid
let timeoutIO = TSS.timeoutSocketIO thandle ssl
request timeoutIO mlog (hn,fromIntegral p) hand `E.catches` [ Handler ignoreConnectionAbruptlyTerminated
, Handler ehs
]
-- remove thread from timeout table
cancel (toHandle timeoutIO)
toShutdown timeoutIO `E.catch` ignoreSSLException
loop :: IO ()
loop = forever $ do w <- acceptTLS https
forkIO $ work w
return ()
pe e = log' ERROR ("ERROR in https accept thread: " ++ show e)
infi = loop `catchSome` pe >> infi
sockName <- getSocketName socket
sockPort <- socketPort socket
log' NOTICE ("Listening on https://" ++ show sockName ++":" ++ show sockPort)
infi `finally` (sClose socket)
where
ignoreSSLException :: SSL.SomeSSLException -> IO ()
ignoreSSLException _ = return ()
-- exception handlers
ignoreConnectionAbruptlyTerminated :: SSL.ConnectionAbruptlyTerminated -> IO ()
ignoreConnectionAbruptlyTerminated _ = return ()
ehs :: SomeException -> IO ()
ehs x = when ((fromException x) /= Just ThreadKilled) $ log' ERROR ("HTTPS request failed with: " ++ show x)
catchSome op h =
op `E.catches` [ Handler ignoreConnectionAbruptlyTerminated
, Handler $ \(e :: ArithException) -> h (toException e)
, Handler $ \(e :: ArrayException) -> h (toException e)
, Handler $ \(e :: IOException) ->
if isFullError e
then return () -- h (toException e) -- we could log the exception, but there could be thousands of them
else throw e
]