0ec9bc2200
While cryptohash has SHA3 support, it has not been updated for the final version of the spec. Note that cryptonite has not been ported to all arches that cryptohash builds on yet.
256 lines
8 KiB
Haskell
256 lines
8 KiB
Haskell
{- Yesod webapp
|
|
-
|
|
- Copyright 2012-2014 Joey Hess <id@joeyh.name>
|
|
-
|
|
- License: BSD-2-clause
|
|
-}
|
|
|
|
{-# LANGUAGE OverloadedStrings, CPP, RankNTypes #-}
|
|
|
|
module Utility.WebApp where
|
|
|
|
import Common
|
|
import Utility.Tmp
|
|
import Utility.FileMode
|
|
import Utility.Hash
|
|
|
|
import qualified Yesod
|
|
import qualified Network.Wai as Wai
|
|
import Network.Wai.Handler.Warp
|
|
import Network.Wai.Handler.WarpTLS
|
|
import Network.HTTP.Types
|
|
import qualified Data.CaseInsensitive as CI
|
|
import Network.Socket
|
|
import "crypto-api" Crypto.Random
|
|
import qualified Web.ClientSession as CS
|
|
import qualified Data.ByteString.Lazy as L
|
|
import qualified Data.ByteString as B
|
|
import qualified Data.Text as T
|
|
import qualified Data.Text.Encoding as TE
|
|
import Blaze.ByteString.Builder.Char.Utf8 (fromText)
|
|
import Blaze.ByteString.Builder (Builder)
|
|
import Control.Arrow ((***))
|
|
import Control.Concurrent
|
|
#ifdef WITH_WEBAPP_SECURE
|
|
import Data.SecureMem
|
|
import Data.Byteable
|
|
#endif
|
|
#ifdef __ANDROID__
|
|
import Data.Endian
|
|
#endif
|
|
|
|
localhost :: HostName
|
|
localhost = "localhost"
|
|
|
|
{- Builds a command to use to start or open a web browser showing an url. -}
|
|
browserProc :: String -> CreateProcess
|
|
#ifdef darwin_HOST_OS
|
|
browserProc url = proc "open" [url]
|
|
#else
|
|
#ifdef __ANDROID__
|
|
-- Warning: The `am` command does not work very reliably on Android.
|
|
browserProc url = proc "am"
|
|
["start", "-a", "android.intent.action.VIEW", "-d", url]
|
|
#else
|
|
#ifdef mingw32_HOST_OS
|
|
-- Warning: On Windows, no quoting or escaping of the url seems possible,
|
|
-- so spaces in it will cause problems. One approach is to make the url
|
|
-- be a relative filename, and adjust the returned CreateProcess to change
|
|
-- to the directory it's in.
|
|
browserProc url = proc "cmd" ["/c start " ++ url]
|
|
#else
|
|
browserProc url = proc "xdg-open" [url]
|
|
#endif
|
|
#endif
|
|
#endif
|
|
|
|
{- Binds to a socket on localhost, or possibly a different specified
|
|
- hostname or address, and runs a webapp on it.
|
|
-
|
|
- An IO action can also be run, to do something with the address,
|
|
- such as start a web browser to view the webapp.
|
|
-}
|
|
runWebApp :: Maybe TLSSettings -> Maybe HostName -> Wai.Application -> (SockAddr -> IO ()) -> IO ()
|
|
runWebApp tlssettings h app observer = withSocketsDo $ do
|
|
sock <- getSocket h
|
|
void $ forkIO $ go webAppSettings sock app
|
|
sockaddr <- fixSockAddr <$> getSocketName sock
|
|
observer sockaddr
|
|
where
|
|
#ifdef WITH_WEBAPP_SECURE
|
|
go = (maybe runSettingsSocket (\ts -> runTLSSocket ts) tlssettings)
|
|
#else
|
|
go = runSettingsSocket
|
|
#endif
|
|
|
|
fixSockAddr :: SockAddr -> SockAddr
|
|
#ifdef __ANDROID__
|
|
{- On Android, the port is currently incorrectly returned in network
|
|
- byte order, which is wrong on little endian systems. -}
|
|
fixSockAddr (SockAddrInet (PortNum port) addr) = SockAddrInet (PortNum $ swapEndian port) addr
|
|
#endif
|
|
fixSockAddr addr = addr
|
|
|
|
-- disable buggy sloworis attack prevention code
|
|
webAppSettings :: Settings
|
|
|
|
webAppSettings = setTimeout halfhour defaultSettings
|
|
where
|
|
halfhour = 30 * 60
|
|
|
|
{- Binds to a local socket, or if specified, to a socket on the specified
|
|
- hostname or address. Selects any free port, unless the hostname ends with
|
|
- ":port"
|
|
-
|
|
- Prefers to bind to the ipv4 address rather than the ipv6 address
|
|
- of localhost, if it's available.
|
|
-}
|
|
getSocket :: Maybe HostName -> IO Socket
|
|
getSocket h = do
|
|
#if defined(__ANDROID__) || defined (mingw32_HOST_OS)
|
|
-- getAddrInfo currently segfaults on Android.
|
|
-- The HostName is ignored by this code.
|
|
when (isJust h) $
|
|
error "getSocket with HostName not supported on this OS"
|
|
addr <- inet_addr "127.0.0.1"
|
|
sock <- socket AF_INET Stream defaultProtocol
|
|
preparesocket sock
|
|
bindSocket sock (SockAddrInet aNY_PORT addr)
|
|
use sock
|
|
where
|
|
#else
|
|
addrs <- getAddrInfo (Just hints) (Just hostname) Nothing
|
|
case (partition (\a -> addrFamily a == AF_INET) addrs) of
|
|
(v4addr:_, _) -> go v4addr
|
|
(_, v6addr:_) -> go v6addr
|
|
_ -> error "unable to bind to a local socket"
|
|
where
|
|
hostname = fromMaybe localhost h
|
|
hints = defaultHints { addrSocketType = Stream }
|
|
{- Repeated attempts because bind sometimes fails for an
|
|
- unknown reason on OSX. -}
|
|
go addr = go' 100 addr
|
|
go' :: Int -> AddrInfo -> IO Socket
|
|
go' 0 _ = error "unable to bind to local socket"
|
|
go' n addr = do
|
|
r <- tryIO $ bracketOnError (open addr) sClose (useaddr addr)
|
|
either (const $ go' (pred n) addr) return r
|
|
open addr = socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
|
|
useaddr addr sock = do
|
|
preparesocket sock
|
|
bindSocket sock (addrAddress addr)
|
|
use sock
|
|
#endif
|
|
preparesocket sock = setSocketOption sock ReuseAddr 1
|
|
use sock = do
|
|
listen sock maxListenQueue
|
|
return sock
|
|
|
|
lookupRequestField :: CI.CI B.ByteString -> Wai.Request -> B.ByteString
|
|
lookupRequestField k req = fromMaybe "" . lookup k $ Wai.requestHeaders req
|
|
|
|
{- Rather than storing a session key on disk, use a random key
|
|
- that will only be valid for this run of the webapp. -}
|
|
webAppSessionBackend :: Yesod.Yesod y => y -> IO (Maybe Yesod.SessionBackend)
|
|
webAppSessionBackend _ = do
|
|
g <- newGenIO :: IO SystemRandom
|
|
case genBytes 96 g of
|
|
Left e -> error $ "failed to generate random key: " ++ show e
|
|
Right (s, _) -> case CS.initKey s of
|
|
Left e -> error $ "failed to initialize key: " ++ show e
|
|
Right key -> use key
|
|
where
|
|
timeout = 120 * 60 -- 120 minutes
|
|
use key =
|
|
Just . Yesod.clientSessionBackend key . fst
|
|
<$> Yesod.clientSessionDateCacher timeout
|
|
|
|
#ifdef WITH_WEBAPP_SECURE
|
|
type AuthToken = SecureMem
|
|
#else
|
|
type AuthToken = T.Text
|
|
#endif
|
|
|
|
toAuthToken :: T.Text -> AuthToken
|
|
#ifdef WITH_WEBAPP_SECURE
|
|
toAuthToken = secureMemFromByteString . TE.encodeUtf8
|
|
#else
|
|
toAuthToken = id
|
|
#endif
|
|
|
|
fromAuthToken :: AuthToken -> T.Text
|
|
#ifdef WITH_WEBAPP_SECURE
|
|
fromAuthToken = TE.decodeLatin1 . toBytes
|
|
#else
|
|
fromAuthToken = id
|
|
#endif
|
|
|
|
{- Generates a random sha2_512 string, encapsulated in a SecureMem,
|
|
- suitable to be used for an authentication secret. -}
|
|
genAuthToken :: IO AuthToken
|
|
genAuthToken = do
|
|
g <- newGenIO :: IO SystemRandom
|
|
return $
|
|
case genBytes 512 g of
|
|
Left e -> error $ "failed to generate auth token: " ++ show e
|
|
Right (s, _) -> toAuthToken $ T.pack $ show $ sha2_512 $ L.fromChunks [s]
|
|
|
|
{- A Yesod isAuthorized method, which checks the auth cgi parameter
|
|
- against a token extracted from the Yesod application.
|
|
-
|
|
- Note that the usual Yesod error page is bypassed on error, to avoid
|
|
- possibly leaking the auth token in urls on that page!
|
|
-}
|
|
checkAuthToken :: (Monad m, Yesod.MonadHandler m) => (Yesod.HandlerSite m -> AuthToken) -> m Yesod.AuthResult
|
|
checkAuthToken extractAuthToken = do
|
|
webapp <- Yesod.getYesod
|
|
req <- Yesod.getRequest
|
|
let params = Yesod.reqGetParams req
|
|
if (toAuthToken <$> lookup "auth" params) == Just (extractAuthToken webapp)
|
|
then return Yesod.Authorized
|
|
else Yesod.sendResponseStatus unauthorized401 ()
|
|
|
|
{- A Yesod joinPath method, which adds an auth cgi parameter to every
|
|
- url matching a predicate, containing a token extracted from the
|
|
- Yesod application.
|
|
-
|
|
- A typical predicate would exclude files under /static.
|
|
-}
|
|
insertAuthToken :: forall y. (y -> AuthToken)
|
|
-> ([T.Text] -> Bool)
|
|
-> y
|
|
-> T.Text
|
|
-> [T.Text]
|
|
-> [(T.Text, T.Text)]
|
|
-> Builder
|
|
insertAuthToken extractAuthToken predicate webapp root pathbits params =
|
|
fromText root `mappend` encodePath pathbits' encodedparams
|
|
where
|
|
pathbits' = if null pathbits then [T.empty] else pathbits
|
|
encodedparams = map (TE.encodeUtf8 *** go) params'
|
|
go "" = Nothing
|
|
go x = Just $ TE.encodeUtf8 x
|
|
authparam = (T.pack "auth", fromAuthToken (extractAuthToken webapp))
|
|
params'
|
|
| predicate pathbits = authparam:params
|
|
| otherwise = params
|
|
|
|
{- Creates a html shim file that's used to redirect into the webapp,
|
|
- to avoid exposing the secret token when launching the web browser. -}
|
|
writeHtmlShim :: String -> String -> FilePath -> IO ()
|
|
writeHtmlShim title url file = viaTmp writeFileProtected file $ genHtmlShim title url
|
|
|
|
{- TODO: generate this static file using Yesod. -}
|
|
genHtmlShim :: String -> String -> String
|
|
genHtmlShim title url = unlines
|
|
[ "<html>"
|
|
, "<head>"
|
|
, "<title>"++ title ++ "</title>"
|
|
, "<meta http-equiv=\"refresh\" content=\"1; URL="++url++"\">"
|
|
, "<body>"
|
|
, "<p>"
|
|
, "<a href=\"" ++ url ++ "\">" ++ title ++ "</a>"
|
|
, "</p>"
|
|
, "</body>"
|
|
, "</html>"
|
|
]
|