servant-auth-cookie (empty) → 0.1.0.0

raw patch · 5 files changed

+1202/−0 lines, 5 filesdep +basedep +base64-bytestringdep +blaze-htmlsetup-changed

Dependencies added: base, base64-bytestring, blaze-html, blaze-markup, bytestring, cereal, cookie, cryptonite, http-media, http-types, memory, servant, servant-auth-cookie, servant-server, text, time, transformers, wai, warp

Files

• LICENSE +674/−0
• Setup.hs +2/−0
• example/Main.hs +161/−0
• servant-auth-cookie.cabal +57/−0
• src/Servant/Server/Experimental/Auth/Cookie.hs +308/−0

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Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library.  If this is what you want to do, use the GNU Lesser General+Public License instead of this License.  But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,161 @@+{-# LANGUAGE DataKinds                  #-}+{-# LANGUAGE DeriveGeneric              #-}+{-# LANGUAGE MultiParamTypeClasses      #-}+{-# LANGUAGE OverloadedStrings          #-}+{-# LANGUAGE TypeFamilies               #-}+{-# LANGUAGE TypeOperators              #-}++import Control.Monad (when)++import Data.Maybe (fromJust, isNothing)+import Data.Serialize (Serialize)+import qualified Data.Text as T (unpack)+import Data.ByteString (ByteString)+import Data.ByteString.Lazy (toStrict, fromStrict)++import Servant (+    Proxy(..), Server, (:>), (:<|>)(..)+  , Header, Headers, addHeader+  , Get, Post, ReqBody, FormUrlEncoded, FromFormUrlEncoded(..))++import Servant.Server (+    Context ((:.), EmptyContext)+  , serveWithContext)++import Servant.API.Experimental.Auth    (AuthProtect)+import Servant.API.ContentTypes         (Accept(..), MimeRender(..))+import Servant.Server.Experimental.Auth (AuthHandler)+import Servant.Server.Experimental.Auth.Cookie++import Network.Wai              (Application, Request)+import Network.Wai.Handler.Warp (run)++import GHC.Generics++import Network.HTTP.Media ((//), (/:))++import Text.Blaze.Html5 ((!))+import Text.Blaze.Html.Renderer.Utf8 (renderHtml)+import qualified Text.Blaze.Html5 as H+import qualified Text.Blaze.Html5.Attributes as A+++data HTML++instance Accept HTML where+   contentType _ = "text" // "html" /: ("charset", "utf-8")++instance MimeRender HTML ByteString where+   mimeRender _ x = fromStrict $ x+++data Account = Account Int String String+  deriving (Show, Eq, Generic)++instance Serialize Account++type instance AuthCookieData = Account+  ++data LoginForm = LoginForm {+  username :: String  +, password :: String+} deriving (Eq, Show)++instance FromFormUrlEncoded LoginForm where+  fromFormUrlEncoded d = do+    let username' = lookup "username" d+    when (isNothing username') $ Left "username field is missing"++    let password' = lookup "password" d+    when (isNothing username') $ Left "password field is missing"++    Right $ LoginForm {+        username = T.unpack . fromJust $ username'+      , password = T.unpack . fromJust $ password'+      }+++usersDB :: [Account]+usersDB = [+    Account 101 "mr_foo" "password1"+  , Account 102 "mr_bar" "letmein"+  , Account 103 "mr_baz" "baseball" +  ]++userLookup :: String -> String -> [Account] -> Maybe Int+userLookup _ _ [] = Nothing+userLookup username' password' ((Account uid username'' password''):as) =+  case (username', password') == (username'', password'') of+    True  -> Just uid+    False -> userLookup username' password' as+++type ExampleAPI =+       Get '[HTML] ByteString+  :<|> ReqBody '[FormUrlEncoded] LoginForm+       :> Post '[HTML] (Headers '[Header "set-cookie" ByteString] ByteString)+  :<|> "private" :> AuthProtect "cookie-auth" :> Get '[HTML] ByteString+++server :: Server ExampleAPI+server = servePublicPage :<|> serveLogin :<|> servePrivatePage where++  servePrivatePage (Account uid u p) = return $ render (privatePage uid u p)++  servePublicPage = return $ render (publicPage "")++  serveLogin form = case userLookup (username form) (password form) usersDB of+    Nothing   -> return $ addHeader "" (render $ publicPage "Incorrect username/password")+    Just uid' -> addSession +                   authSettings+                   (Account uid' (username form) (password form))+                   (render $ publicPage "You are logged in")++  render = toStrict . renderHtml+++authSettings :: Settings+authSettings = defaultSettings {+    cookieFlags = []+  , hideReason = False+  }++app :: Application+app = serveWithContext+  (Proxy :: Proxy ExampleAPI)+  ((defaultAuthHandler authSettings :: AuthHandler Request Account) :. EmptyContext)+  server++main :: IO ()+main = run 8080 app +    ++pageMenu :: H.Html+pageMenu = do+  H.a ! A.href "/"        $ "public"+  _ <- " "+  H.a ! A.href "/private" $ "private"+  H.hr++publicPage :: String -> H.Html+publicPage message = H.docTypeHtml $ do+  H.head $ do+    H.title "public page"+  H.body $ do+    pageMenu+    H.form ! A.method "post" ! A.action "/" $ do+      H.input ! A.type_ "text"     ! A.name "username" >> H.br+      H.input ! A.type_ "password" ! A.name "password" >> H.br+      H.input ! A.type_ "submit"+    when (length message > 0) $ H.p (H.toHtml message)++privatePage :: Int -> String -> String -> H.Html+privatePage uid username' password' = H.docTypeHtml $ do+  H.head $ do+    H.title "private page"+  H.body $ do+    pageMenu+    H.p $ H.b "ID: "       >> H.toHtml (show uid)+    H.p $ H.b "username: " >> H.toHtml username'+    H.p $ H.b "password: " >> H.toHtml password'

@@ -0,0 +1,57 @@+name:                servant-auth-cookie+version:             0.1.0.0+synopsis:            Authentication via encrypted cookies+description:         Authentication via encrypted client-side cookies,+                     inspired by client-session library by Michael Snoyman and based on+                     ideas of the paper "A Secure Cookie Protocol" by Alex Liu et al.+license:             GPL-3+license-file:        LICENSE+author:              Al Zohali+maintainer:          Al Zohali <zohl@fmap.me>+category:            Web+build-type:          Simple+cabal-version:       >=1.10+++source-repository head+  type:     git+  location: https://github.com/zohl/servant-auth-cookie.git+++library+  exposed-modules:     +    Servant.Server.Experimental.Auth.Cookie+  build-depends: base >=4.8 && <4.9+               , base64-bytestring+               , bytestring+               , cereal+               , cookie+               , cryptonite+               , http-types+               , memory+               , servant+               , servant-server+               , time >=1.5 && <1.6+               , transformers+               , wai+  hs-source-dirs:      src+  default-language:    Haskell2010+++executable example+  main-is:             Main.hs+  other-extensions:    DataKinds, TypeFamilies, DeriveGeneric, TypeOperators+  build-depends: base >=4.8 && <4.9+               , blaze-html+               , blaze-markup+               , bytestring+               , cereal+               , http-media+               , servant+               , servant-auth-cookie+               , servant-server+               , text+               , wai+               , warp+  hs-source-dirs:      example+  default-language:    Haskell2010

@@ -0,0 +1,308 @@+{-# LANGUAGE DataKinds                  #-}+{-# LANGUAGE FlexibleContexts           #-}+{-# LANGUAGE GADTs                      #-}+{-# LANGUAGE OverloadedStrings          #-}+{-# LANGUAGE TypeFamilies               #-}+{-# LANGUAGE ScopedTypeVariables        #-}+{-# LANGUAGE PartialTypeSignatures      #-}+++module Servant.Server.Experimental.Auth.Cookie (+    AuthCookieData+  , Cookie(..)++  , Settings(..)+  , defaultSettings++  , encryptCookie+  , decryptCookie++  , encryptSession+  , decryptSession++  , addSession+  , getSession++  , defaultAuthHandler+  ) where +++import Control.Monad.IO.Class+import Control.Monad             (when)       +import Control.Concurrent+import Data.Either (isLeft)+import Data.Maybe                (fromMaybe, fromJust, isNothing)+import Data.IORef++import GHC.TypeLits (Symbol)++import Data.ByteString              (ByteString)+import Data.ByteString.Lazy         (toStrict, fromStrict)+import Data.ByteString.Lazy.Builder (toLazyByteString)++import qualified Data.ByteArray as BA+import qualified Data.ByteString as BS            (length, splitAt, concat, pack)+import qualified Data.ByteString.Base64 as Base64 (encode, decode)+import qualified Data.ByteString.Char8 as BS8++       +import Data.Serialize            (Serialize, put, get)+import Data.Serialize.Put        (runPut)+import Data.Serialize.Get        (runGet)++import Data.Time.Clock           (UTCTime, getCurrentTime, addUTCTime)+import Data.Time.Format          (defaultTimeLocale, formatTime, parseTimeM)++import Network.HTTP.Types.Header        (hCookie)+import Network.Wai                      (Request, requestHeaders)+import Servant                          (throwError)+import Servant                          (addHeader)+import Servant.API.Experimental.Auth    (AuthProtect)+import Servant.API.ResponseHeaders      (AddHeader)+import Servant.Server                   (err403, errBody, Handler)+import Servant.Server.Experimental.Auth (AuthHandler, AuthServerData, mkAuthHandler)+++import Web.Cookie                (parseCookies, renderCookies)++import Crypto.Cipher.AES              (AES256)+import Crypto.Cipher.Types            (ctrCombine, IV, makeIV, Cipher(..), BlockCipher(..))+import Crypto.Error                   (maybeCryptoError)+import Crypto.Hash                    (HashAlgorithm(..))+import Crypto.Hash.Algorithms         (SHA256)+import Crypto.MAC.HMAC                (HMAC)+import qualified Crypto.MAC.HMAC as H (hmac)+import Crypto.Random                  (drgNew, DRG(..))++import System.IO.Unsafe (unsafePerformIO)+++++++resetRef :: IORef a -> IO a -> IO ()+resetRef ref f = (forkIO $ f >>= atomicWriteIORef ref) >> return ()+++data RandomSource m where+  RandomSource :: (DRG a) => a -> Int -> RandomSource a++rsThreshold :: Int+rsThreshold = ivSize * 1024++mkRandomSource :: IO (RandomSource _)+mkRandomSource = RandomSource <$> drgNew <*> return 0++rsRef :: IORef (RandomSource _)+rsRef = unsafePerformIO $ mkRandomSource >>= newIORef+{-# NOINLINE rsRef #-} ++getRandomBytes :: Int -> IO ByteString+getRandomBytes n = do+  (result, bytes) <- atomicModifyIORef rsRef $ \(RandomSource drg bytes) -> let+    (result, drg') = randomBytesGenerate n drg+    bytes'         = bytes + n+    in (RandomSource drg' (bytes + n), (result, bytes')) ++  when (bytes >= rsThreshold) $ resetRef rsRef mkRandomSource++  return $! result+++data ServerKey = ServerKey ByteString UTCTime++skThreshold :: Int+skThreshold = 60 * 60 * 24++skLength :: Int+skLength = 16++mkServerKey :: IO ServerKey+mkServerKey = ServerKey+  <$> (fst . randomBytesGenerate skLength <$> drgNew)+  <*> (addUTCTime (fromIntegral skThreshold) <$> getCurrentTime)++skRef :: IORef ServerKey+skRef = unsafePerformIO $ mkServerKey >>= newIORef+{-# NOINLINE skRef #-} ++getServerKey :: IO ByteString+getServerKey = do+  (ServerKey key time) <- readIORef skRef+  currentTime          <- getCurrentTime++  when (time < currentTime) $ resetRef skRef mkServerKey++  return $! key+++data Cookie = Cookie {+    iv         :: ByteString+  , expiration :: UTCTime+  , payload    :: ByteString+  }++expirationFormat :: String+expirationFormat = "%0Y%m%d%H%M%S"+++ivSize :: Int+expirationSize :: Int+macSize :: Int++[ivSize, expirationSize, macSize] = [+    blockSize (undefined::AES256)+  , 14+  , hashDigestSize (undefined::SHA256)+  ]+++hmac :: ByteString -> ByteString -> ByteString+hmac key msg = (BS.pack . BA.unpack) ((H.hmac key msg) :: HMAC SHA256)++aes :: ByteString -> ByteString -> ByteString -> ByteString+aes iv key msg = (BS.pack . BA.unpack) (ctrCombine key' iv' msg) where+  iv' = (fromMaybe (error "bad IV") (makeIV iv)) :: IV AES256+  key' = (fromMaybe (error "bad key") (maybeCryptoError $ cipherInit key)) :: AES256++splitMany :: (Int -> a -> (a, a)) -> [Int] -> a -> [a]+splitMany _ [] s = [s]+splitMany f (x:xs) s = let (chunk, rest) = f x s in chunk:(splitMany f xs rest)++       +-- | Encrypt given cookie with server key+encryptCookie :: ByteString -> Cookie -> ByteString+encryptCookie serverKey cookie = BS.concat [iv', expiration', payload', mac] where+  iv'         = iv cookie +  expiration' = BS8.pack . formatTime defaultTimeLocale expirationFormat $ expiration cookie+  key         = hmac serverKey $ BS.concat [iv', expiration']+  payload'    = aes iv' key (payload cookie)+  mac         = hmac serverKey $ BS.concat [iv', expiration', payload']++-- | Decrypt cookie from bytestring+decryptCookie :: ByteString -> UTCTime -> ByteString -> Either String Cookie+decryptCookie serverKey currentTime s = do+  let [iv', expiration', payload', mac'] = splitMany BS.splitAt [+          ivSize+        , expirationSize+        , (BS.length s) - ivSize - expirationSize - macSize] s++  when (mac' /= (hmac serverKey $ BS.concat [iv', expiration', payload'])) $ Left "MAC failed"++  let parsedTime = parseTimeM True defaultTimeLocale expirationFormat $ BS8.unpack expiration'+  when (isNothing parsedTime) $ Left "Wrong time format"++  let expiration'' = fromJust parsedTime+  when (currentTime >= expiration'') $ Left "Expired cookie"++  let key = hmac serverKey $ BS.concat [iv', expiration']++  Right Cookie {+      iv         = iv'+    , expiration = expiration''+    , payload    = aes iv' key payload'+    }+++-- | Pack session object into a cookie+encryptSession :: (Serialize a) => Int -> a -> IO ByteString+encryptSession maxAge session = do+  iv'         <- getRandomBytes 16+  expiration' <- addUTCTime (fromIntegral maxAge) <$> getCurrentTime+  serverKey   <- getServerKey ++  return $ Base64.encode $ encryptCookie serverKey Cookie {+      iv         = iv' +    , expiration = expiration'+    , payload    = (runPut $ put session)+    }++-- | Unpack session object from a cookie+decryptSession :: (Serialize a) => ByteString -> IO (Either String a)+decryptSession s = do+  currentTime <- getCurrentTime +  serverKey   <- getServerKey+  return $ (Base64.decode s) >>= (decryptCookie serverKey currentTime) >>= (runGet get . payload)+++++data Settings = Settings {+    sessionField :: ByteString+    -- ^ Name of a cookie which stores session object++  , cookieFlags  :: [ByteString]+    -- ^ Session cookie's flags++  , maxAge       :: Int+    -- ^ How much time (in seconds) the cookie will be valid+    -- (corresponds to Max-Age attribute)++  , path         :: ByteString+    -- ^ Scope of the cookie (corresponds to Path attribute)++  , errorMessage :: String+    -- ^ Message to show in request when the cookie is invalid++  , hideReason   :: Bool+    -- ^ Whether to print reason why the cookie was rejected+    -- (if False, errorMessage will be used instead)+  }+++defaultSettings :: Settings+defaultSettings = Settings {+   sessionField = "Session"+ , cookieFlags = ["HttpOnly", "Secure"]+ , maxAge = 300+ , path = "/"+ , hideReason = True+ , errorMessage = "Not authorized"+ }+  ++type family AuthCookieData+type instance AuthServerData (AuthProtect "cookie-auth") = AuthCookieData++++getSession :: forall a. (Serialize a) => Settings -> Request -> IO (Either String a)+getSession settings req = formatError <$>+                             either (return . Left) decryptSession getSessionString where++  getSessionString :: Either String ByteString+  getSessionString = do+    let cookies = parseCookies <$> lookup hCookie (requestHeaders req)+    when (isNothing cookies) $ Left "No cookie header"+ +    let sessionStr = lookup (sessionField settings) (fromJust cookies)+    when (isNothing sessionStr) $ Left "No session cookie"  +    Right $ fromJust sessionStr+ +  formatError :: Either String a -> Either String a+  formatError result = do+    when ((isLeft result) && (hideReason settings)) $ Left (errorMessage settings)+    result+++addSession :: (MonadIO m, Serialize a, AddHeader (h::Symbol) ByteString s r)+                => Settings -> a -> s -> m r+addSession settings a response = do+  sessionString <- liftIO $ encryptSession (maxAge settings) a+  return $ addHeader (toStrict $ toLazyByteString $ renderCookies $ [+                         ((sessionField settings), sessionString)+                       , ("Path"                 , (path settings))+                       , ("Max-Age"              , BS8.pack $ show $ maxAge settings)+                       ] ++ (map (\f -> (f, "")) (cookieFlags settings))) response+++defaultAuthHandler :: forall a. (Serialize a) => Settings -> AuthHandler Request a+defaultAuthHandler settings = mkAuthHandler handler where++  handler :: Request -> Handler a+  handler req = (liftIO $ (getSession settings req)) >>= either+    (\err -> throwError (err403 { errBody = fromStrict $ BS8.pack err }))+    return++