eidolon/Handler/Login.hs

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-- eidolon -- A simple gallery in Haskell and Yesod
-- Copyright (C) 2015 Amedeo Molnár
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published
-- by the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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module Handler.Login where
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import Import hiding (returnJson)
import qualified Data.Text as T
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-- old hmac
import Crypto.HMAC as Old
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import Crypto.Hash.CryptoAPI (SHA1)
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-- new hmac
import Crypto.MAC.HMAC as New
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import Crypto.Hash.Algorithms (Keccak_512)
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import Data.Text.Encoding (encodeUtf8, decodeUtf8)
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import Data.Serialize (encode)
import Data.Maybe
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import qualified Data.ByteString as B
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import qualified Data.ByteString.Char8 as BC
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import Data.Aeson.Types
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getLoginR :: Handler Html
getLoginR = do
master <- getYesod
let addWarn = "http://" `T.isPrefixOf` appRoot (appSettings master)
(loginRawWidget, _) <- generateFormPost $
renderBootstrap3 BootstrapBasicForm loginForm
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defaultLayout $ do
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setTitle "Eidolon :: Login"
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$(widgetFile "login")
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postLoginR :: Handler RepJson
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postLoginR = do
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mUserName <- lookupPostParam "username"
mHexToken <- lookupPostParam "token"
mHexResponse <- lookupPostParam "response"
case (mUserName, mHexToken, mHexResponse) of
(Just userName, Nothing, Nothing) -> do
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tempUser <- runDB $ getBy $ UniqueUser userName
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case tempUser of
Just (Entity userId user) -> do
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let salt = userSalt user
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token <- liftIO makeRandomToken
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runDB $ insert_ $ Token (encodeUtf8 token) "login" userName
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returnJson ["salt" .= toHex salt, "token" .= toHex (encodeUtf8 token)]
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Nothing ->
returnJsonError ("No such user" :: T.Text)
(Nothing, Just hexToken, Just hexResponse) -> do
response <- do
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let tempToken = fromHex' $ T.unpack hexToken
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savedToken <- runDB $ selectFirst [TokenKind ==. "login", TokenToken ==. tempToken] []
case savedToken of
Just (Entity tokenId token) -> do
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let savedUserName = tokenUsername token
mqueriedUser <- runDB $ getBy $ UniqueUser savedUserName
let queriedUser = entityVal $ fromJust mqueriedUser
salted = userSalted queriedUser
hexSalted = toHex salted
expected = hmacKeccak (encodeUtf8 $ toHex $ tokenToken token) (encodeUtf8 hexSalted)
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if encodeUtf8 hexResponse == expected
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then do
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-- Success!!
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runDB $ delete tokenId
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return $ Right $ (entityKey $ fromJust mqueriedUser)
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else
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return $ Left ("Wrong password" :: T.Text)
Nothing ->
return $ Left "Invalid token"
case response of
Left msg ->
returnJsonError msg
Right userId -> do
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setSession "userId" $ extractKey userId
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setMessage "Succesfully logged in"
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welcomeLink <- ($ProfileR userId) <$> getUrlRender
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returnJson ["welcome" .= welcomeLink]
_ ->
returnJsonError ("Protocol error" :: T.Text)
postLoginRawR :: Handler Html
postLoginRawR = do
((res, _), _) <- runFormPost $
renderBootstrap3 BootstrapBasicForm loginForm
case res of
FormSuccess cred -> do
muser <- runDB $ getBy $ UniqueUser $ credentialsName cred
case muser of
Just (Entity uId user) -> do
let testSalted = BC.unpack $ hmacKeccak (userSalt user) (encodeUtf8 $ credentialsPasswd cred)
if fromHex' testSalted == userSalted user
then do
setSession "userId" $ extractKey uId
setMessage "Successfully logged in"
redirect $ ProfileR uId
else do
setMessage "Wrong password"
redirect LoginR
Nothing -> do
setMessage "No such user"
redirect LoginR
_ -> do
setMessage "Login error"
redirect LoginR
data Credentials = Credentials
{ credentialsName :: Text
, credentialsPasswd :: Text
}
deriving Show
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loginForm :: AForm Handler Credentials
loginForm = Credentials
<$> areq textField (bfs ("Username" :: T.Text)) Nothing
<*> areq passwordField (bfs ("Password" :: T.Text)) Nothing
<* bootstrapSubmit ("Login" :: BootstrapSubmit T.Text)
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getLogoutR :: Handler Html
getLogoutR = do
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deleteSession "userId"
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setMessage "Succesfully logged out"
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redirect HomeR
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returnJson :: Monad m => [Pair] -> m RepJson
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returnJson = return . repJson . object
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returnJsonError :: (ToJSON a, Monad m) => a -> m RepJson
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returnJsonError = returnJson . (:[]) . ("error" .=)
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hmacSHA1 :: B.ByteString -> B.ByteString -> B.ByteString
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hmacSHA1 keyData msgData =
let key = MacKey keyData
sha1 :: SHA1
sha1 = hmac' key msgData
in encode sha1
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hmacKeccak :: B.ByteString -> B.ByteString -> B.ByteString
hmacKeccak key msg = BC.pack $ show $ hmacGetDigest (New.hmac key msg :: HMAC Keccak_512)