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module Attach (
AttachService,
attachToOwner, attachAccept,
) where
import Control.Monad.Except
import Control.Monad.Reader
import Crypto.Hash
import Crypto.Random
import Data.Bits
import Data.ByteArray (Bytes, ScrubbedBytes, convert)
import qualified Data.ByteArray as BA
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString.Lazy as BL
import Data.Maybe
import qualified Data.Text as T
import Data.Word
import Identity
import Network
import PubKey
import Service
import State
import Storage
import Storage.Key
data AttachService = AttachRequest RefDigest
| AttachResponse Bytes
| AttachRequestNonce Bytes
| AttachIdentity (Stored (Signed IdentityData)) [ScrubbedBytes]
| AttachDecline
data AttachState = NoAttach
| OurRequest Bytes
| OurRequestConfirm (Maybe (UnifiedIdentity, [ScrubbedBytes]))
| OurRequestReady
| PeerRequest Bytes RefDigest
| PeerRequestConfirm
| AttachDone
| AttachFailed
instance Storable AttachService where
store' at = storeRec $ do
case at of
AttachRequest x -> storeBinary "request" x
AttachResponse x -> storeBinary "response" x
AttachRequestNonce x -> storeBinary "reqnonce" x
AttachIdentity x keys -> do
storeRef "identity" x
mapM_ (storeBinary "skey") keys
AttachDecline -> storeText "decline" ""
load' = loadRec $ do
(req :: Maybe Bytes) <- loadMbBinary "request"
rsp <- loadMbBinary "response"
rnonce <- loadMbBinary "reqnonce"
aid <- loadMbRef "identity"
skeys <- loadBinaries "skey"
(decline :: Maybe T.Text) <- loadMbText "decline"
let res = catMaybes
[ AttachRequest <$> (digestFromByteString =<< req)
, AttachResponse <$> rsp
, AttachRequestNonce <$> rnonce
, AttachIdentity <$> aid <*> pure skeys
, const AttachDecline <$> decline
]
case res of
x:_ -> return x
[] -> throwError "invalid attach stange"
instance Service AttachService where
serviceID _ = mkServiceID "4995a5f9-2d4d-48e9-ad3b-0bf1c2a1be7f"
type ServiceState AttachService = AttachState
emptyServiceState _ = NoAttach
serviceHandler spacket = ((,fromStored spacket) <$> svcGet) >>= \case
(NoAttach, AttachRequest confirm) -> do
peer <- asks $ svcPeer
svcPrint $ "Attach from " ++ T.unpack (displayIdentity peer) ++ " initiated"
nonce <- liftIO $ getRandomBytes 32
svcSet $ PeerRequest nonce confirm
replyPacket $ AttachResponse nonce
(NoAttach, _) -> return ()
(OurRequest nonce, AttachResponse pnonce) -> do
peer <- asks $ svcPeer
self <- maybe (throwError "failed to verify own identity") return .
validateIdentity . lsIdentity . fromStored =<< svcGetLocal
svcPrint $ "Attach to " ++ T.unpack (displayIdentity peer) ++ ": " ++ confirmationNumber (nonceDigest self peer nonce pnonce)
svcSet $ OurRequestConfirm Nothing
replyPacket $ AttachRequestNonce nonce
(OurRequest _, _) -> do
svcSet $ AttachFailed
replyPacket AttachDecline
(OurRequestConfirm _, AttachIdentity sdata keys) -> do
verifyAttachedIdentity sdata >>= \case
Just owner -> do
svcPrint $ "Attachment confirmed by peer"
svcSet $ OurRequestConfirm $ Just (owner, keys)
Nothing -> do
svcPrint $ "Failed to verify new identity"
svcSet $ AttachFailed
replyPacket AttachDecline
(OurRequestConfirm _, _) -> do
svcSet $ AttachFailed
replyPacket AttachDecline
(OurRequestReady, AttachIdentity sdata keys) -> do
verifyAttachedIdentity sdata >>= \case
Just identity -> do
svcPrint $ "Accepted updated identity"
st <- storedStorage <$> svcGetLocal
finalizeAttach st identity keys
Nothing -> do
svcPrint $ "Failed to verify new identity"
svcSet $ AttachFailed
replyPacket AttachDecline
(OurRequestReady, _) -> do
svcSet $ AttachFailed
replyPacket AttachDecline
(PeerRequest nonce dgst, AttachRequestNonce pnonce) -> do
peer <- asks $ svcPeer
self <- maybe (throwError "failed to verify own identity") return .
validateIdentity . lsIdentity . fromStored =<< svcGetLocal
if dgst == nonceDigest peer self pnonce BA.empty
then do svcPrint $ "Attach from " ++ T.unpack (displayIdentity peer) ++ ": " ++ confirmationNumber (nonceDigest peer self pnonce nonce)
svcSet PeerRequestConfirm
else do svcPrint $ "Failed attach from " ++ T.unpack (displayIdentity peer)
svcSet AttachFailed
replyPacket AttachDecline
(PeerRequest _ _, _) -> do
svcSet $ AttachFailed
replyPacket AttachDecline
(PeerRequestConfirm, _) -> do
svcSet $ AttachFailed
replyPacket AttachDecline
(AttachDone, _) -> return ()
(AttachFailed, _) -> return ()
attachToOwner :: (MonadIO m, MonadError String m) => (String -> IO ()) -> UnifiedIdentity -> Peer -> m ()
attachToOwner _ self peer = do
nonce <- liftIO $ getRandomBytes 32
pid <- case peerIdentity peer of
PeerIdentityFull pid -> return pid
_ -> throwError "incomplete peer identity"
sendToPeerWith self peer $ \case
NoAttach -> return (Just $ AttachRequest (nonceDigest self pid nonce BA.empty), OurRequest nonce)
_ -> throwError "alredy in progress"
attachAccept :: (MonadIO m, MonadError String m) => (String -> IO ()) -> UnifiedIdentity -> Peer -> m ()
attachAccept printMsg self peer = do
let st = storedStorage $ idData self
sendToPeerWith self peer $ \case
NoAttach -> throwError $ "none in progress"
OurRequest {} -> throwError $ "waiting for peer"
OurRequestConfirm Nothing -> do
liftIO $ printMsg $ "Confirmed peer, waiting for updated identity"
return (Nothing, OurRequestReady)
OurRequestConfirm (Just (identity, keys)) -> do
liftIO $ printMsg $ "Accepted updated identity"
finalizeAttach st identity keys
return (Nothing, AttachDone)
OurRequestReady -> throwError $ "alredy accepted, waiting for peer"
PeerRequest {} -> throwError $ "waiting for peer"
PeerRequestConfirm -> do
liftIO $ printMsg $ "Accepted new attached device, seding updated identity"
owner <- liftIO $ mergeSharedIdentity st
PeerIdentityFull pid <- return $ peerIdentity peer
Just secret <- liftIO $ loadKey $ idKeyIdentity owner
liftIO $ do
identity <- wrappedStore st =<< sign secret =<< wrappedStore st (emptyIdentityData $ idKeyIdentity pid)
{ iddPrev = [idData pid], iddOwner = Just (idData owner) }
skeys <- map keyGetData . catMaybes <$> mapM loadKey [ idKeyIdentity owner, idKeyMessage owner ]
return (Just $ AttachIdentity identity skeys, NoAttach)
AttachDone -> throwError $ "alredy done"
AttachFailed -> throwError $ "alredy failed"
nonceDigest :: UnifiedIdentity -> UnifiedIdentity -> Bytes -> Bytes -> RefDigest
nonceDigest id1 id2 nonce1 nonce2 = hashFinalize $ hashUpdates hashInit $
BL.toChunks $ serializeObject $ Rec
[ (BC.pack "id", RecRef $ storedRef $ idData id1)
, (BC.pack "id", RecRef $ storedRef $ idData id2)
, (BC.pack "nonce", RecBinary $ convert nonce1)
, (BC.pack "nonce", RecBinary $ convert nonce2)
]
confirmationNumber :: RefDigest -> String
confirmationNumber dgst = let (a:b:c:d:_) = map fromIntegral $ BA.unpack dgst :: [Word32]
str = show $ (a .|. (b `shift` 8) .|. (c `shift` 16) .|. (d `shift` 24)) `mod` (10 ^ len)
in replicate (len - length str) '0' ++ str
where len = 6
verifyAttachedIdentity :: Stored (Signed IdentityData) -> ServiceHandler s (Maybe UnifiedIdentity)
verifyAttachedIdentity sdata = do
curid <- lsIdentity . fromStored <$> svcGetLocal
secret <- maybe (throwError "failed to load own secret key") return =<<
liftIO (loadKey $ iddKeyIdentity $ fromStored $ signedData $ fromStored curid)
sdata' <- liftIO $ wrappedStore (storedStorage sdata) =<< signAdd secret (fromStored sdata)
return $ do
guard $ iddKeyIdentity (fromStored $ signedData $ fromStored sdata) ==
iddKeyIdentity (fromStored $ signedData $ fromStored curid)
identity <- validateIdentity sdata'
guard $ iddPrev (fromStored $ signedData $ fromStored $ idData identity) == [curid]
return identity
finalizeAttach :: MonadIO m => Storage -> UnifiedIdentity -> [ScrubbedBytes] -> m ()
finalizeAttach st identity skeys = do
liftIO $ updateLocalState_ st $ \slocal -> do
let owner = finalOwner identity
pkeys <- mapM (copyStored st) [ idKeyIdentity owner, idKeyMessage owner ]
mapM_ storeKey $ catMaybes [ keyFromData sec pub | sec <- skeys, pub <- pkeys ]
shared <- makeSharedStateUpdate st (idDataF owner) (lsShared $ fromStored slocal)
wrappedStore st (fromStored slocal)
{ lsIdentity = idData identity
, lsShared = [ shared ]
}
|