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{-# LANGUAGE PackageImports #-}
module Propellor.PrivData where
import Control.Applicative
import System.FilePath
import System.IO
import System.Directory
import Data.Maybe
import Data.Monoid
import Data.List
import Control.Monad
import Control.Monad.IfElse
import "mtl" Control.Monad.Reader
import qualified Data.Map as M
import qualified Data.Set as S
import Propellor.Types
import Propellor.Types.Info
import Propellor.Message
import Propellor.Info
import Utility.Monad
import Utility.PartialPrelude
import Utility.Exception
import Utility.Process
import Utility.Tmp
import Utility.SafeCommand
import Utility.Misc
import Utility.FileMode
import Utility.Env
import Utility.Table
-- | Allows a Property to access the value of a specific PrivDataField,
-- for use in a specific Context.
--
-- Example use:
--
-- > withPrivData (PrivFile pemfile) (Context "joeyh.name") $ \getdata ->
-- > property "joeyh.name ssl cert" $ getdata $ \privdata ->
-- > liftIO $ writeFile pemfile privdata
-- > where pemfile = "/etc/ssl/certs/web.pem"
--
-- Note that if the value is not available, the action is not run
-- and instead it prints a message to help the user make the necessary
-- private data available.
--
-- The resulting Property includes Info about the PrivDataField
-- being used, which is necessary to ensure that the privdata is sent to
-- the remote host by propellor.
withPrivData
:: PrivDataField
-> Context
-> (((PrivData -> Propellor Result) -> Propellor Result) -> Property)
-> Property
withPrivData field context@(Context cname) mkprop = addinfo $ mkprop $ \a ->
maybe missing a =<< liftIO (getLocalPrivData field context)
where
missing = liftIO $ do
warningMessage $ "Missing privdata " ++ show field ++ " (for " ++ cname ++ ")"
putStrLn $ "Fix this by running: propellor --set '" ++ show field ++ "' '" ++ cname ++ "'"
return FailedChange
addinfo p = p { propertyInfo = propertyInfo p <> mempty { _privDataFields = S.singleton (field, context) } }
addPrivDataField :: (PrivDataField, Context) -> Property
addPrivDataField v = pureInfoProperty (show v) $
mempty { _privDataFields = S.singleton v }
{- Gets the requested field's value, in the specified context if it's
- available, from the host's local privdata cache. -}
getLocalPrivData :: PrivDataField -> Context -> IO (Maybe PrivData)
getLocalPrivData field context =
getPrivData field context . fromMaybe M.empty <$> localcache
where
localcache = catchDefaultIO Nothing $ readish <$> readFile privDataLocal
type PrivMap = M.Map (PrivDataField, Context) PrivData
{- Get only the set of PrivData that the Host's Info says it uses. -}
filterPrivData :: Host -> PrivMap -> PrivMap
filterPrivData host = M.filterWithKey (\k _v -> S.member k used)
where
used = _privDataFields $ hostInfo host
getPrivData :: PrivDataField -> Context -> PrivMap -> Maybe PrivData
getPrivData field context = M.lookup (field, context)
setPrivData :: PrivDataField -> Context -> IO ()
setPrivData field context = do
putStrLn "Enter private data on stdin; ctrl-D when done:"
setPrivDataTo field context =<< hGetContentsStrict stdin
dumpPrivData :: PrivDataField -> Context -> IO ()
dumpPrivData field context =
maybe (error "Requested privdata is not set.") putStrLn
=<< (getPrivData field context <$> decryptPrivData)
editPrivData :: PrivDataField -> Context -> IO ()
editPrivData field context = do
v <- getPrivData field context <$> decryptPrivData
v' <- withTmpFile "propellorXXXX" $ \f h -> do
hClose h
maybe noop (writeFileProtected f) v
editor <- getEnvDefault "EDITOR" "vi"
unlessM (boolSystem editor [File f]) $
error "Editor failed; aborting."
readFile f
setPrivDataTo field context v'
listPrivDataFields :: [Host] -> IO ()
listPrivDataFields hosts = do
m <- decryptPrivData
showtable "Currently set data:" $
map mkrow (M.keys m)
showtable "Data that would be used if set:" $
map mkrow (M.keys $ M.difference wantedmap m)
where
header = ["Field", "Context", "Used by"]
mkrow k@(field, (Context context)) =
[ shellEscape $ show field
, shellEscape context
, intercalate ", " $ sort $ fromMaybe [] $ M.lookup k usedby
]
mkhostmap host = M.fromList $ map (\k -> (k, [hostName host])) $
S.toList $ _privDataFields $ hostInfo host
usedby = M.unionsWith (++) $ map mkhostmap hosts
wantedmap = M.fromList $ zip (M.keys usedby) (repeat "")
showtable desc rows = do
putStrLn $ "\n" ++ desc
putStr $ unlines $ formatTable $ tableWithHeader header rows
setPrivDataTo :: PrivDataField -> Context -> PrivData -> IO ()
setPrivDataTo field context value = do
makePrivDataDir
m <- decryptPrivData
let m' = M.insert (field, context) (chomp value) m
gpgEncrypt privDataFile (show m')
putStrLn "Private data set."
void $ boolSystem "git" [Param "add", File privDataFile]
where
chomp s
| end s == "\n" = chomp (beginning s)
| otherwise = s
decryptPrivData :: IO PrivMap
decryptPrivData = fromMaybe M.empty . readish <$> gpgDecrypt privDataFile
makePrivDataDir :: IO ()
makePrivDataDir = createDirectoryIfMissing False privDataDir
privDataDir :: FilePath
privDataDir = "privdata"
privDataFile :: FilePath
privDataFile = privDataDir </> "privdata.gpg"
privDataLocal :: FilePath
privDataLocal = privDataDir </> "local"
gpgDecrypt :: FilePath -> IO String
gpgDecrypt f = ifM (doesFileExist f)
( readProcess "gpg" ["--decrypt", f]
, return ""
)
gpgEncrypt :: FilePath -> String -> IO ()
gpgEncrypt f s = do
encrypted <- writeReadProcessEnv "gpg"
[ "--default-recipient-self"
, "--armor"
, "--encrypt"
]
Nothing
(Just $ flip hPutStr s)
Nothing
viaTmp writeFile f encrypted
|
