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{-# LANGUAGE DeriveGeneric #-}
module Network.TLS.Types.Session where
import Codec.Serialise
import qualified Data.ByteString as B
import GHC.Generics
import Network.Socket (HostName)
import Network.TLS.Crypto (Group, Hash (..), hash)
import Network.TLS.Imports
import Network.TLS.Types.Cipher
import Network.TLS.Types.Version
-- | A session ID
type SessionID = ByteString
-- | Identity
type SessionIDorTicket = ByteString
-- | Encrypted session ticket (encrypt(encode 'SessionData')).
type Ticket = ByteString
isTicket :: SessionIDorTicket -> Bool
isTicket x
| B.length x > 32 = True
| otherwise = False
toSessionID :: Ticket -> SessionID
toSessionID = hash SHA256
-- | Compression identification
type CompressionID = Word8
-- | Session data to resume
data SessionData = SessionData
{ sessionVersion :: Version
, sessionCipher :: CipherID
, sessionCompression :: CompressionID
, sessionClientSNI :: Maybe HostName
, sessionSecret :: ByteString
, sessionGroup :: Maybe Group
, sessionTicketInfo :: Maybe TLS13TicketInfo
, sessionALPN :: Maybe ByteString
, sessionMaxEarlyDataSize :: Int
, sessionFlags :: [SessionFlag]
} -- sessionFromTicket :: Bool
deriving (Show, Eq, Generic)
is0RTTPossible :: SessionData -> Bool
is0RTTPossible sd = sessionMaxEarlyDataSize sd > 0
-- | Some session flags
data SessionFlag
= -- | Session created with Extended Main Secret
SessionEMS
deriving (Show, Eq, Enum, Generic)
type Second = Word32
type Millisecond = Word64
data TLS13TicketInfo = TLS13TicketInfo
{ lifetime :: Second -- NewSessionTicket.ticket_lifetime in seconds
, ageAdd :: Second -- NewSessionTicket.ticket_age_add
, txrxTime :: Millisecond -- serverSendTime or clientReceiveTime
, estimatedRTT :: Maybe Millisecond
}
deriving (Show, Eq, Generic)
instance Serialise TLS13TicketInfo
instance Serialise SessionFlag
instance Serialise SessionData
|
