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|
{-# LANGUAGE OverloadedStrings #-}
module Network.TLS.Handshake.State13 (
CryptLevel (
CryptEarlySecret,
CryptHandshakeSecret,
CryptApplicationSecret
),
TrafficSecret,
getTxRecordState,
getRxRecordState,
setTxRecordState,
setRxRecordState,
getTxLevel,
getRxLevel,
clearTxRecordState,
clearRxRecordState,
setHelloParameters13,
transcriptHash,
wrapAsMessageHash13,
PendingRecvAction (..),
setPendingRecvActions,
popPendingRecvAction,
) where
import Control.Concurrent.MVar
import Control.Monad.State
import qualified Data.ByteString as B
import Data.IORef
import Network.TLS.Cipher
import Network.TLS.Compression
import Network.TLS.Context.Internal
import Network.TLS.Crypto
import Network.TLS.Handshake.State
import Network.TLS.Imports
import Network.TLS.KeySchedule (hkdfExpandLabel)
import Network.TLS.Record.State
import Network.TLS.Struct
import Network.TLS.Types
getTxRecordState :: Context -> IO (Hash, Cipher, CryptLevel, ByteString)
getTxRecordState ctx = getXState ctx ctxTxRecordState
getRxRecordState :: Context -> IO (Hash, Cipher, CryptLevel, ByteString)
getRxRecordState ctx = getXState ctx ctxRxRecordState
getXState
:: Context
-> (Context -> MVar RecordState)
-> IO (Hash, Cipher, CryptLevel, ByteString)
getXState ctx func = do
tx <- readMVar (func ctx)
let usedCipher = fromJust $ stCipher tx
usedHash = cipherHash usedCipher
level = stCryptLevel tx
secret = cstMacSecret $ stCryptState tx
return (usedHash, usedCipher, level, secret)
-- In the case of QUIC, stCipher is Nothing.
-- So, fromJust causes an error.
getTxLevel :: Context -> IO CryptLevel
getTxLevel ctx = getXLevel ctx ctxTxRecordState
getRxLevel :: Context -> IO CryptLevel
getRxLevel ctx = getXLevel ctx ctxRxRecordState
getXLevel
:: Context
-> (Context -> MVar RecordState)
-> IO CryptLevel
getXLevel ctx func = do
tx <- readMVar (func ctx)
return $ stCryptLevel tx
class TrafficSecret ty where
fromTrafficSecret :: ty -> (CryptLevel, ByteString)
instance HasCryptLevel a => TrafficSecret (AnyTrafficSecret a) where
fromTrafficSecret prx@(AnyTrafficSecret s) = (getCryptLevel prx, s)
instance HasCryptLevel a => TrafficSecret (ClientTrafficSecret a) where
fromTrafficSecret prx@(ClientTrafficSecret s) = (getCryptLevel prx, s)
instance HasCryptLevel a => TrafficSecret (ServerTrafficSecret a) where
fromTrafficSecret prx@(ServerTrafficSecret s) = (getCryptLevel prx, s)
setTxRecordState :: TrafficSecret ty => Context -> Hash -> Cipher -> ty -> IO ()
setTxRecordState = setXState ctxTxRecordState BulkEncrypt
setRxRecordState :: TrafficSecret ty => Context -> Hash -> Cipher -> ty -> IO ()
setRxRecordState = setXState ctxRxRecordState BulkDecrypt
setXState
:: TrafficSecret ty
=> (Context -> MVar RecordState)
-> BulkDirection
-> Context
-> Hash
-> Cipher
-> ty
-> IO ()
setXState func encOrDec ctx h cipher ts =
let (lvl, secret) = fromTrafficSecret ts
in setXState' func encOrDec ctx h cipher lvl secret
setXState'
:: (Context -> MVar RecordState)
-> BulkDirection
-> Context
-> Hash
-> Cipher
-> CryptLevel
-> ByteString
-> IO ()
setXState' func encOrDec ctx h cipher lvl secret =
modifyMVar_ (func ctx) (\_ -> return rt)
where
bulk = cipherBulk cipher
keySize = bulkKeySize bulk
ivSize = max 8 (bulkIVSize bulk + bulkExplicitIV bulk)
key = hkdfExpandLabel h secret "key" "" keySize
iv = hkdfExpandLabel h secret "iv" "" ivSize
cst =
CryptState
{ cstKey = bulkInit bulk encOrDec key
, cstIV = iv
, cstMacSecret = secret
}
rt =
RecordState
{ stCryptState = cst
, stMacState = MacState{msSequence = 0}
, stCryptLevel = lvl
, stCipher = Just cipher
, stCompression = nullCompression
}
clearTxRecordState :: Context -> IO ()
clearTxRecordState = clearXState ctxTxRecordState
clearRxRecordState :: Context -> IO ()
clearRxRecordState = clearXState ctxRxRecordState
clearXState :: (Context -> MVar RecordState) -> Context -> IO ()
clearXState func ctx =
modifyMVar_ (func ctx) (\rt -> return rt{stCipher = Nothing})
setHelloParameters13 :: Cipher -> HandshakeM (Either TLSError ())
setHelloParameters13 cipher = do
hst <- get
case hstPendingCipher hst of
Nothing -> do
put
hst
{ hstPendingCipher = Just cipher
, hstPendingCompression = nullCompression
, hstHandshakeDigest = updateDigest $ hstHandshakeDigest hst
}
return $ Right ()
Just oldcipher
| cipher == oldcipher -> return $ Right ()
| otherwise ->
return $
Left $
Error_Protocol "TLS 1.3 cipher changed after hello retry" IllegalParameter
where
hashAlg = cipherHash cipher
updateDigest (HandshakeMessages bytes) = HandshakeDigestContext $ foldl hashUpdate (hashInit hashAlg) $ reverse bytes
updateDigest (HandshakeDigestContext _) = error "cannot initialize digest with another digest"
-- When a HelloRetryRequest is sent or received, the existing transcript must be
-- wrapped in a "message_hash" construct. See RFC 8446 section 4.4.1. This
-- applies to key-schedule computations as well as the ones for PSK binders.
wrapAsMessageHash13 :: HandshakeM ()
wrapAsMessageHash13 = do
cipher <- getPendingCipher
foldHandshakeDigest (cipherHash cipher) foldFunc
where
foldFunc dig =
B.concat
[ "\254\0\0"
, B.singleton (fromIntegral $ B.length dig)
, dig
]
transcriptHash :: MonadIO m => Context -> m ByteString
transcriptHash ctx = do
hst <- fromJust <$> getHState ctx
case hstHandshakeDigest hst of
HandshakeDigestContext hashCtx -> return $ hashFinal hashCtx
HandshakeMessages _ -> error "un-initialized handshake digest"
setPendingRecvActions :: Context -> [PendingRecvAction] -> IO ()
setPendingRecvActions ctx = writeIORef (ctxPendingRecvActions ctx)
popPendingRecvAction :: Context -> IO (Maybe PendingRecvAction)
popPendingRecvAction ctx = do
let ref = ctxPendingRecvActions ctx
actions <- readIORef ref
case actions of
bs : bss -> writeIORef ref bss >> return (Just bs)
[] -> return Nothing
|
