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module Attach (
AttachService,
attachToOwner, attachAccept,
) where
import Control.Monad.Except
import Control.Monad.Reader
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 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 <$> (refDigestFromByteString =<< req)
, AttachResponse <$> 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 = hashToRefDigest $ 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 ]
}
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