module Network.PeyoTLS.Extension (Extension(..), SignAlg(..), HashAlg(..)) where
import Control.Applicative ((<$>), (<*>))
import Data.Bits (shiftL, (.|.))
import Data.Word (Word8, Word16)
import qualified Data.ByteString as BS
import qualified Codec.Bytable.BigEndian as B
import qualified Crypto.Types.PubKey.DH as DH
import qualified Crypto.Types.PubKey.ECC as ECC
import Network.PeyoTLS.HSAlg(HashAlg(..), SignAlg(..))
data Extension
= ESName [ServerName]
| EECurve [ECC.CurveName] | EEcPFrt [EcPointFormat]
| ESsnTicketTls BS.ByteString
| ENextProtoNego BS.ByteString
| ERenegoInfo BS.ByteString
| ERaw EType BS.ByteString
deriving (Show, Eq)
instance B.Bytable Extension where
encode = encodeE; decode = B.evalBytableM B.parse
instance B.Parsable Extension where
parse = parseE
encodeE :: Extension -> BS.ByteString
encodeE (ESName sn) = encodeE . ERaw TSName . B.addLen w16 $ cmap B.encode sn
encodeE (EECurve ec) = encodeE . ERaw TECurve . B.addLen w16 $ cmap B.encode ec
encodeE (EEcPFrt pf) = encodeE . ERaw TEcPFrt . B.addLen w8 $ cmap B.encode pf
encodeE (ESsnTicketTls stt) = encodeE $ ERaw TSsnTicketTls stt
encodeE (ENextProtoNego npn) = encodeE $ ERaw TNextProtoNego npn
encodeE (ERenegoInfo ri) = encodeE . ERaw TRenegoInfo $ B.addLen w8 ri
encodeE (ERaw et body) = B.encode et `BS.append` B.addLen w16 body
parseE :: B.BytableM Extension
parseE = do
(t, l) <- (,) <$> B.take 2 <*> B.take 2
case t of
TSName -> ESName <$> (flip B.list B.parse =<< B.take 2)
TECurve -> EECurve <$> (flip B.list (B.take 2) =<< B.take 2)
TEcPFrt -> EEcPFrt <$> (flip B.list (B.take 1) =<< B.take 1)
TSsnTicketTls -> ESsnTicketTls <$> B.take l
TNextProtoNego -> ENextProtoNego <$> B.take l
TRenegoInfo -> ERenegoInfo <$> (B.take =<< B.take 1)
_ -> ERaw t <$> B.take l
data EType
= TSName | TECurve | TEcPFrt | TSsnTicketTls
| TNextProtoNego | TRenegoInfo | TRaw Word16 deriving (Show, Eq)
instance B.Bytable EType where
encode TSName = B.encode (0 :: Word16)
encode TECurve = B.encode (10 :: Word16)
encode TEcPFrt = B.encode (11 :: Word16)
encode TSsnTicketTls = B.encode (35 :: Word16)
encode TNextProtoNego = B.encode (13172 :: Word16)
encode TRenegoInfo = B.encode (65281 :: Word16)
encode (TRaw et) = B.encode et
decode bs = case BS.unpack bs of
[w1, w2] -> Right $
case fromIntegral w1 `shiftL` 8 .|. fromIntegral w2 of
0 -> TSName
10 -> TECurve
11 -> TEcPFrt
35 -> TSsnTicketTls
13172 -> TNextProtoNego
65281 -> TRenegoInfo
et -> TRaw et
_ -> Left "Extension: EType.decode"
data ServerName = SNHostName BS.ByteString | SNRaw NameType BS.ByteString
deriving (Show, Eq)
instance B.Bytable ServerName where
encode (SNHostName nm) = B.encode $ SNRaw NTHostName nm
encode (SNRaw nt nm) = B.encode nt `BS.append` B.addLen w16 nm
decode = B.evalBytableM B.parse
instance B.Parsable ServerName where
parse = do
(t, n) <- (,) <$> B.take 1 <*> (B.take =<< B.take 2)
return $ case t of
NTHostName -> SNHostName n; _ -> SNRaw t n
data NameType = NTHostName | NTRaw Word8 deriving (Show, Eq)
instance B.Bytable NameType where
encode NTHostName = BS.pack [0]
encode (NTRaw t) = BS.pack [t]
decode bs = case BS.unpack bs of
[t] -> Right $ case t of 0 -> NTHostName; _ -> NTRaw t
_ -> Left "Extension: NameType.decode"
instance B.Bytable DH.Params where
encode (DH.Params p g) =
BS.concat [B.addLen w16 $ B.encode p, B.addLen w16 $ B.encode g]
decode = B.evalBytableM B.parse
instance B.Parsable DH.Params where
parse = DH.Params
<$> (B.take =<< B.take 2)
<*> (B.take =<< B.take 2)
instance B.Bytable DH.PublicNumber where
encode = B.addLen w16 . B.encode . \(DH.PublicNumber pn) -> pn
decode = B.evalBytableM B.parse
instance B.Parsable DH.PublicNumber where
parse = fromInteger <$> (B.take =<< B.take 2)
data EcCurveType = ExplicitPrime | ExplicitChar2 | NamedCurve | ECTRaw Word8
deriving Show
instance B.Bytable EcCurveType where
encode ExplicitPrime = BS.pack [1]
encode ExplicitChar2 = BS.pack [2]
encode NamedCurve = BS.pack [3]
encode (ECTRaw w) = BS.pack [w]
decode = B.evalBytableM B.parse
instance B.Parsable EcCurveType where
parse = do
ct <- B.head
return $ case ct of
1 -> ExplicitPrime
2 -> ExplicitChar2
3 -> NamedCurve
w -> ECTRaw w
instance B.Bytable ECC.CurveName where
encode ECC.SEC_p256r1 = B.encode (23 :: Word16)
encode ECC.SEC_p384r1 = B.encode (24 :: Word16)
encode ECC.SEC_p521r1 = B.encode (25 :: Word16)
encode _ = error "Extension.encodeCN: not implemented"
decode bs = case BS.unpack bs of
[w1, w2] -> case fromIntegral w1 `shiftL` 8 .|. fromIntegral w2 of
(1 :: Word16) -> Right ECC.SEC_t163k1
(14 :: Word16) -> Right ECC.SEC_t571r1
(23 :: Word16) -> Right ECC.SEC_p256r1
(24 :: Word16) -> Right ECC.SEC_p384r1
(25 :: Word16) -> Right ECC.SEC_p521r1
n -> Left $ "Extension: CurveName.decode: unknown curve: " ++
show n
_ -> Left "Extension: CurveName.decode: bad format"
instance B.Parsable ECC.CurveName where
parse = B.take 2
instance B.Bytable ECC.Curve where
encode c
| c == ECC.getCurveByName ECC.SEC_p256r1 =
B.encode NamedCurve `BS.append` B.encode ECC.SEC_p256r1
| otherwise = error "TlsServer.encodeC: not implemented"
decode = B.evalBytableM B.parse
instance B.Parsable ECC.Curve where
parse = ECC.getCurveByName <$> do
NamedCurve <- B.parse
B.parse
data EcPointFormat = EPFUncompressed | EPFRaw Word8 deriving (Show, Eq)
instance B.Bytable EcPointFormat where
encode EPFUncompressed = BS.pack [0]
encode (EPFRaw f) = BS.pack [f]
decode bs = case BS.unpack bs of
[f] -> Right $ case f of 0 -> EPFUncompressed; _ -> EPFRaw f
_ -> Left "Extension: Bytable.decode"
instance B.Bytable ECC.Point where
encode (ECC.Point x y) = B.addLen w8 $
4 `BS.cons` padd 32 0 (B.encode x) `BS.append`
padd 32 0 (B.encode y)
encode ECC.PointO = error "Extension: EC.Point.encode"
decode = B.evalBytableM B.parse
padd :: Int -> Word8 -> BS.ByteString -> BS.ByteString
padd n w s = BS.replicate (n BS.length s) w `BS.append` s
instance B.Parsable ECC.Point where
parse = do
bs <- B.take =<< B.take 1
case BS.uncons bs of
Just (4, rest) -> return $ let (x, y) = BS.splitAt 32 rest in
ECC.Point
(either error id $ B.decode x)
(either error id $ B.decode y)
_ -> fail "Extension: ECC.Point.parse"
w8 :: Word8; w8 = undefined
w16 :: Word16; w16 = undefined
cmap :: (a -> BS.ByteString) -> [a] -> BS.ByteString
cmap = (BS.concat .) . map