201 lines
6.6 KiB
Haskell
201 lines
6.6 KiB
Haskell
{- git-annex assistant webapp configurator for pairing
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
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{-# LANGUAGE CPP #-}
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module Assistant.WebApp.Configurators.Pairing where
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import Assistant.Pairing
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import Assistant.WebApp
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import Assistant.WebApp.Types
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import Assistant.WebApp.SideBar
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import Utility.Yesod
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#ifdef WITH_PAIRING
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import Assistant.Common
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import Assistant.Pairing.Network
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import Assistant.Pairing.MakeRemote
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import Assistant.Ssh
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import Assistant.Alert
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import Assistant.DaemonStatus
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import Utility.Verifiable
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import Utility.Network
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import Annex.UUID
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#endif
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import Utility.UserInfo
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import Yesod
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import Data.Text (Text)
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#ifdef WITH_PAIRING
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import qualified Data.Text as T
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import qualified Data.Text.Encoding as T
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import qualified Data.ByteString.Lazy as B
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import Data.Char
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import qualified Control.Exception as E
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import Control.Concurrent
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#endif
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{- Starts sending out pair requests. -}
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getStartPairR :: Handler RepHtml
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#ifdef WITH_PAIRING
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getStartPairR = promptSecret Nothing $ startPairing PairReq noop pairingAlert Nothing
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#else
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getStartPairR = noPairing
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#endif
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{- Runs on the system that responds to a pair request; sets up the ssh
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- authorized key first so that the originating host can immediately sync
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- with us. -}
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getFinishPairR :: PairMsg -> Handler RepHtml
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#ifdef WITH_PAIRING
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getFinishPairR msg = promptSecret (Just msg) $ \_ secret -> do
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liftIO $ setup
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startPairing PairAck cleanup alert uuid "" secret
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where
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alert = pairRequestAcknowledgedAlert (pairRepo msg) . Just
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setup = setupAuthorizedKeys msg
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cleanup = removeAuthorizedKeys False $
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remoteSshPubKey $ pairMsgData msg
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uuid = Just $ pairUUID $ pairMsgData msg
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#else
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getFinishPairR _ = noPairing
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#endif
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getInprogressPairR :: SecretReminder -> Handler RepHtml
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#ifdef WITH_PAIRING
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getInprogressPairR s = pairPage $ do
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let secret = fromSecretReminder s
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$(widgetFile "configurators/pairing/inprogress")
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#else
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getInprogressPairR _ = noPairing
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#endif
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#ifdef WITH_PAIRING
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{- Starts pairing, at either the PairReq (initiating host) or
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- PairAck (responding host) stage.
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-
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- Displays an alert, and starts a thread sending the pairing message,
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- which will continue running until the other host responds, or until
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- canceled by the user. If canceled by the user, runs the oncancel action.
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-
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- Redirects to the pairing in progress page.
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-}
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startPairing :: PairStage -> IO () -> (AlertButton -> Alert) -> Maybe UUID -> Text -> Secret -> Widget
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startPairing stage oncancel alert muuid displaysecret secret = do
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dstatus <- daemonStatus <$> lift getYesod
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urlrender <- lift getUrlRender
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reldir <- fromJust . relDir <$> lift getYesod
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{- Generating a ssh key pair can take a while, so do it in the
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- background. -}
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void $ liftIO $ forkIO $ do
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keypair <- genSshKeyPair
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pairdata <- PairData
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<$> getHostname
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<*> myUserName
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<*> pure reldir
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<*> pure (sshPubKey keypair)
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<*> (maybe genUUID return muuid)
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let sender = multicastPairMsg Nothing secret pairdata
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let pip = PairingInProgress secret Nothing keypair pairdata stage
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startSending dstatus pip stage $ sendrequests sender dstatus urlrender
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lift $ redirect $ InprogressPairR $ toSecretReminder displaysecret
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where
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{- Sends pairing messages until the thread is killed,
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- and shows an activity alert while doing it.
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-
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- The cancel button returns the user to the HomeR. This is
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- not ideal, but they have to be sent somewhere, and could
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- have been on a page specific to the in-process pairing
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- that just stopped, so can't go back there.
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-}
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sendrequests sender dstatus urlrender _stage = do
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tid <- myThreadId
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let selfdestruct = AlertButton
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{ buttonLabel = "Cancel"
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, buttonUrl = urlrender HomeR
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, buttonAction = Just $ const $ do
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oncancel
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killThread tid
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}
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alertDuring dstatus (alert selfdestruct) $ do
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_ <- E.try (sender stage) :: IO (Either E.SomeException ())
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return ()
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data InputSecret = InputSecret { secretText :: Maybe Text }
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{- If a PairMsg is passed in, ensures that the user enters a secret
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- that can validate it. -}
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promptSecret :: Maybe PairMsg -> (Text -> Secret -> Widget) -> Handler RepHtml
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promptSecret msg cont = pairPage $ do
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((result, form), enctype) <- lift $
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runFormGet $ renderBootstrap $
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InputSecret <$> aopt textField "Secret phrase" Nothing
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case result of
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FormSuccess v -> do
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let rawsecret = fromMaybe "" $ secretText v
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let secret = toSecret rawsecret
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case msg of
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Nothing -> case secretProblem secret of
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Nothing -> cont rawsecret secret
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Just problem ->
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showform form enctype $ Just problem
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Just m ->
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if verify (fromPairMsg m) secret
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then cont rawsecret secret
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else showform form enctype $ Just
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"That's not the right secret phrase."
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_ -> showform form enctype Nothing
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where
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showform form enctype mproblem = do
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let start = isNothing msg
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let badphrase = isJust mproblem
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let problem = fromMaybe "" mproblem
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let (username, hostname) = maybe ("", "")
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(\(_, v, a) -> (T.pack $ remoteUserName v, T.pack $ fromMaybe (showAddr a) (remoteHostName v)))
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(verifiableVal . fromPairMsg <$> msg)
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u <- T.pack <$> liftIO myUserName
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let sameusername = username == u
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let authtoken = webAppFormAuthToken
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$(widgetFile "configurators/pairing/prompt")
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{- This counts unicode characters as more than one character,
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- but that's ok; they *do* provide additional entropy. -}
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secretProblem :: Secret -> Maybe Text
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secretProblem s
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| B.null s = Just "The secret phrase cannot be left empty. (Remember that punctuation and white space is ignored.)"
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| B.length s < 7 = Just "Enter a longer secret phrase, at least 6 characters, but really, a phrase is best! This is not a password you'll need to enter every day."
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| s == toSecret sampleQuote = Just "Speaking of foolishness, don't paste in the example I gave. Enter a different phrase, please!"
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| otherwise = Nothing
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toSecret :: Text -> Secret
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toSecret s = B.fromChunks [T.encodeUtf8 $ T.toLower $ T.filter isAlphaNum s]
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{- From Dickens -}
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sampleQuote :: Text
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sampleQuote = T.unwords
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[ "It was the best of times,"
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, "it was the worst of times,"
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, "it was the age of wisdom,"
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, "it was the age of foolishness."
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]
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#else
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noPairing :: Handler RepHtml
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noPairing = pairPage $
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$(widgetFile "configurators/pairing/disabled")
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#endif
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pairPage :: Widget -> Handler RepHtml
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pairPage w = bootstrap (Just Config) $ do
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sideBarDisplay
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setTitle "Pairing"
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w
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