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"]