270 lines
8.7 KiB
Haskell
270 lines
8.7 KiB
Haskell
{- git-annex assistant webapp configurator for ssh-based remotes
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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 GPL version 3 or higher.
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-}
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{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
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module Assistant.WebApp.Configurators.Ssh where
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import Assistant.Common
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import Assistant.Ssh
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import Assistant.MakeRemote
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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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import Yesod
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import Data.Text (Text)
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import qualified Data.Text as T
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import Network.BSD
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import System.Posix.User
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sshConfigurator :: Widget -> Handler RepHtml
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sshConfigurator a = bootstrap (Just Config) $ do
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sideBarDisplay
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setTitle "Add a remote server"
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a
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data SshServer = SshServer
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{ hostname :: Maybe Text
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, username :: Maybe Text
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, directory :: Maybe Text
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}
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deriving (Show)
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{- SshServer is only used for applicative form prompting, this converts
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- the result of such a form into a SshData. -}
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mkSshData :: SshServer -> SshData
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mkSshData sshserver = SshData
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{ sshHostName = fromMaybe "" $ hostname sshserver
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, sshUserName = username sshserver
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, sshDirectory = fromMaybe "" $ directory sshserver
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, sshRepoName = genSshRepoName
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(T.unpack $ fromJust $ hostname sshserver)
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(maybe "" T.unpack $ directory sshserver)
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, needsPubKey = False
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, rsyncOnly = False
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}
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sshServerAForm :: (Maybe Text) -> AForm WebApp WebApp SshServer
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sshServerAForm localusername = SshServer
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<$> aopt check_hostname "Host name" Nothing
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<*> aopt check_username "User name" (Just localusername)
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<*> aopt textField "Directory" (Just $ Just $ T.pack gitAnnexAssistantDefaultDir)
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where
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check_hostname = checkM (liftIO . checkdns) textField
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checkdns t = do
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let h = T.unpack t
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r <- catchMaybeIO $ getHostByName h
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return $ case r of
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-- canonicalize input hostname if it had no dot
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Just hostentry
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| '.' `elem` h -> Right t
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| otherwise -> Right $ T.pack $ hostName hostentry
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Nothing -> Left bad_hostname
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check_username = checkBool (all (`notElem` "/:@ \t") . T.unpack)
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bad_username textField
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bad_hostname = "cannot resolve host name" :: Text
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bad_username = "bad user name" :: Text
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data ServerStatus
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= UntestedServer
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| UnusableServer Text -- reason why it's not usable
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| UsableRsyncServer
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| UsableSshServer
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deriving (Eq)
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usable :: ServerStatus -> Bool
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usable UntestedServer = False
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usable (UnusableServer _) = False
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usable UsableRsyncServer = True
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usable UsableSshServer = True
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getAddSshR :: Handler RepHtml
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getAddSshR = sshConfigurator $ do
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u <- liftIO $ T.pack . userName
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<$> (getUserEntryForID =<< getEffectiveUserID)
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((result, form), enctype) <- lift $
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runFormGet $ renderBootstrap $ sshServerAForm (Just u)
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case result of
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FormSuccess sshserver -> do
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(status, needspubkey) <- liftIO $ testServer sshserver
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if usable status
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then lift $ redirect $ ConfirmSshR $
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(mkSshData sshserver)
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{ needsPubKey = needspubkey
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, rsyncOnly = (status == UsableRsyncServer)
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}
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else showform form enctype status
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_ -> showform form enctype UntestedServer
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where
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showform form enctype status = do
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let authtoken = webAppFormAuthToken
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$(widgetFile "configurators/ssh/add")
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{- Test if we can ssh into the server.
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-
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- Two probe attempts are made. First, try sshing in using the existing
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- configuration, but don't let ssh prompt for any password. If
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- passwordless login is already enabled, use it. Otherwise,
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- a special ssh key will need to be generated just for this server.
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-
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- Once logged into the server, probe to see if git-annex-shell is
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- available, or rsync.
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-}
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testServer :: SshServer -> IO (ServerStatus, Bool)
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testServer (SshServer { hostname = Nothing }) = return
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(UnusableServer "Please enter a host name.", False)
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testServer sshserver@(SshServer { hostname = Just hn }) = do
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status <- probe [sshOpt "NumberOfPasswordPrompts" "0"]
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if usable status
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then return (status, False)
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else do
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status' <- probe []
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return (status', True)
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where
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probe extraopts = do
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let remotecommand = join ";" $
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[ report "loggedin"
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, checkcommand "git-annex-shell"
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, checkcommand "rsync"
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]
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knownhost <- knownHost hn
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let sshopts = filter (not . null) $ extraopts ++
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{- If this is an already known host, let
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- ssh check it as usual.
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- Otherwise, trust the host key. -}
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[ if knownhost then "" else sshOpt "StrictHostKeyChecking" "no"
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, "-n" -- don't read from stdin
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, genSshHost (fromJust $ hostname sshserver) (username sshserver)
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, remotecommand
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]
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parsetranscript . fst <$> sshTranscript sshopts ""
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parsetranscript s
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| reported "git-annex-shell" = UsableSshServer
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| reported "rsync" = UsableRsyncServer
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| reported "loggedin" = UnusableServer
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"Neither rsync nor git-annex are installed on the server. Perhaps you should go install them?"
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| otherwise = UnusableServer $ T.pack $
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"Failed to ssh to the server. Transcript: " ++ s
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where
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reported r = token r `isInfixOf` s
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checkcommand c = "if which " ++ c ++ "; then " ++ report c ++ "; fi"
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token r = "git-annex-probe " ++ r
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report r = "echo " ++ token r
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{- Runs a ssh command; if it fails shows the user the transcript,
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- and if it succeeds, runs an action. -}
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sshSetup :: [String] -> String -> Handler RepHtml -> Handler RepHtml
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sshSetup opts input a = do
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(transcript, ok) <- liftIO $ sshTranscript opts input
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if ok
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then a
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else showSshErr transcript
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showSshErr :: String -> Handler RepHtml
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showSshErr msg = sshConfigurator $
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$(widgetFile "configurators/ssh/error")
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getConfirmSshR :: SshData -> Handler RepHtml
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getConfirmSshR sshdata = sshConfigurator $ do
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let authtoken = webAppFormAuthToken
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$(widgetFile "configurators/ssh/confirm")
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getMakeSshGitR :: SshData -> Handler RepHtml
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getMakeSshGitR = makeSsh False
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getMakeSshRsyncR :: SshData -> Handler RepHtml
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getMakeSshRsyncR = makeSsh True
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makeSsh :: Bool -> SshData -> Handler RepHtml
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makeSsh rsync sshdata
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| needsPubKey sshdata = do
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keypair <- liftIO $ genSshKeyPair
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sshdata' <- liftIO $ setupSshKeyPair keypair sshdata
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makeSsh' rsync sshdata' (Just keypair)
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| otherwise = makeSsh' rsync sshdata Nothing
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makeSsh' :: Bool -> SshData -> Maybe SshKeyPair -> Handler RepHtml
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makeSsh' rsync sshdata keypair =
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sshSetup [sshhost, remoteCommand] "" $
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makeSshRepo rsync sshdata
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where
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sshhost = genSshHost (sshHostName sshdata) (sshUserName sshdata)
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remotedir = T.unpack $ sshDirectory sshdata
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remoteCommand = join "&&" $ catMaybes
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[ Just $ "mkdir -p " ++ shellEscape remotedir
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, Just $ "cd " ++ shellEscape remotedir
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, if rsync then Nothing else Just $ "git init --bare --shared"
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, if rsync then Nothing else Just $ "git annex init"
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, if needsPubKey sshdata
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then maybe Nothing (Just . addAuthorizedKeysCommand (rsyncOnly sshdata) . sshPubKey) keypair
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else Nothing
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]
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makeSshRepo :: Bool -> SshData -> Handler RepHtml
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makeSshRepo forcersync sshdata = do
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webapp <- getYesod
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liftIO $ makeSshRemote
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(fromJust $ threadState webapp)
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(daemonStatus webapp)
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(scanRemotes webapp)
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forcersync sshdata
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redirect RepositoriesR
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getAddRsyncNetR :: Handler RepHtml
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getAddRsyncNetR = do
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((result, form), enctype) <- runFormGet $
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renderBootstrap $ sshServerAForm Nothing
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let showform status = bootstrap (Just Config) $ do
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sideBarDisplay
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setTitle "Add a Rsync.net repository"
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let authtoken = webAppFormAuthToken
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$(widgetFile "configurators/addrsync.net")
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case result of
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FormSuccess sshserver -> do
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knownhost <- liftIO $ maybe (return False) knownHost (hostname sshserver)
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keypair <- liftIO $ genSshKeyPair
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sshdata <- liftIO $ setupSshKeyPair keypair
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(mkSshData sshserver)
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{ needsPubKey = True
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, rsyncOnly = True
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, sshRepoName = "rsync.net"
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}
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{- I'd prefer to separate commands with && , but
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- rsync.net's shell does not support that.
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-
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- The dd method of appending to the
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- authorized_keys file is the one recommended by
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- rsync.net documentation. I touch the file first
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- to not need to use a different method to create
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- it.
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-}
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let remotecommand = join ";" $
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[ "mkdir -p .ssh"
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, "touch .ssh/authorized_keys"
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, "dd of=.ssh/authorized_keys oflag=append conv=notrunc"
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, "mkdir -p " ++ T.unpack (sshDirectory sshdata)
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]
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let sshopts = filter (not . null) $
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[ if knownhost then "" else sshOpt "StrictHostKeyChecking" "no"
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, genSshHost (sshHostName sshdata) (sshUserName sshdata)
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, remotecommand
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]
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let host = fromMaybe "" $ hostname sshserver
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checkhost host showform $
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sshSetup sshopts (sshPubKey keypair) $
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makeSshRepo True sshdata
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_ -> showform UntestedServer
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where
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checkhost host showform a
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| ".rsync.net" `T.isSuffixOf` T.toLower host = a
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| otherwise = showform $ UnusableServer
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"That is not a rsync.net host name."
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