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module Propellor.Property.Ssh (
setSshdConfig,
permitRootLogin,
passwordAuthentication,
hasAuthorizedKeys,
restartSshd,
uniqueHostKeys
) where
import Propellor
import qualified Propellor.Property.File as File
import Propellor.Property.User
import Utility.SafeCommand
sshBool :: Bool -> String
sshBool True = "yes"
sshBool False = "no"
sshdConfig :: FilePath
sshdConfig = "/etc/ssh/sshd_config"
setSshdConfig :: String -> Bool -> Property
setSshdConfig setting allowed = combineProperties "sshd config"
[ sshdConfig `File.lacksLine` (sshline $ not allowed)
, sshdConfig `File.containsLine` (sshline allowed)
]
`onChange` restartSshd
`describe` unwords [ "ssh config:", setting, sshBool allowed ]
where
sshline v = setting ++ " " ++ sshBool v
permitRootLogin :: Bool -> Property
permitRootLogin = setSshdConfig "PermitRootLogin"
passwordAuthentication :: Bool -> Property
passwordAuthentication = setSshdConfig "PasswordAuthentication"
hasAuthorizedKeys :: UserName -> IO Bool
hasAuthorizedKeys = go <=< homedir
where
go Nothing = return False
go (Just home) = not . null <$> catchDefaultIO ""
(readFile $ home </> ".ssh" </> "authorized_keys")
restartSshd :: Property
restartSshd = cmdProperty "service" ["ssh", "restart"]
-- | Blows away existing host keys and make new ones.
-- Useful for systems installed from an image that might reuse host keys.
-- A flag file is used to only ever do this once.
uniqueHostKeys :: Property
uniqueHostKeys = flagFile prop "/etc/ssh/.unique_host_keys"
`onChange` restartSshd
where
prop = Property "ssh unique host keys" $ do
void $ boolSystem "sh"
[ Param "-c"
, Param "rm -f /etc/ssh/ssh_host_*"
]
ensureProperty $
cmdProperty "/var/lib/dpkg/info/openssh-server.postinst"
["configure"]
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