88 lines
2.4 KiB
Haskell
88 lines
2.4 KiB
Haskell
module Propellor.Property.Ssh (
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setSshdConfig,
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permitRootLogin,
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passwordAuthentication,
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hasAuthorizedKeys,
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restartSshd,
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uniqueHostKeys,
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keyImported
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) where
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import Propellor
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import qualified Propellor.Property.File as File
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import Propellor.Property.User
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import Utility.SafeCommand
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import Utility.FileMode
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import System.PosixCompat
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sshBool :: Bool -> String
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sshBool True = "yes"
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sshBool False = "no"
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sshdConfig :: FilePath
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sshdConfig = "/etc/ssh/sshd_config"
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setSshdConfig :: String -> Bool -> Property
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setSshdConfig setting allowed = combineProperties "sshd config"
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[ sshdConfig `File.lacksLine` (sshline $ not allowed)
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, sshdConfig `File.containsLine` (sshline allowed)
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]
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`onChange` restartSshd
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`describe` unwords [ "ssh config:", setting, sshBool allowed ]
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where
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sshline v = setting ++ " " ++ sshBool v
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permitRootLogin :: Bool -> Property
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permitRootLogin = setSshdConfig "PermitRootLogin"
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passwordAuthentication :: Bool -> Property
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passwordAuthentication = setSshdConfig "PasswordAuthentication"
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hasAuthorizedKeys :: UserName -> IO Bool
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hasAuthorizedKeys = go <=< homedir
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where
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go Nothing = return False
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go (Just home) = not . null <$> catchDefaultIO ""
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(readFile $ home </> ".ssh" </> "authorized_keys")
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restartSshd :: Property
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restartSshd = cmdProperty "service" ["ssh", "restart"]
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-- | Blows away existing host keys and make new ones.
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-- Useful for systems installed from an image that might reuse host keys.
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-- A flag file is used to only ever do this once.
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uniqueHostKeys :: Property
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uniqueHostKeys = flagFile prop "/etc/ssh/.unique_host_keys"
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`onChange` restartSshd
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where
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prop = Property "ssh unique host keys" $ do
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void $ liftIO $ boolSystem "sh"
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[ Param "-c"
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, Param "rm -f /etc/ssh/ssh_host_*"
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]
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ensureProperty $
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cmdProperty "/var/lib/dpkg/info/openssh-server.postinst"
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["configure"]
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-- | Sets up a user with a ssh private key from the site's privdata.
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--
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-- The ssh public key (.pub) is not installed. Ssh does not use it.
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keyImported :: SshKeyType -> UserName -> Property
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keyImported keytype user = Property desc install
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where
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desc = user ++ " has ssh key"
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install = do
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f <- liftIO keyfile
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ifM (liftIO $ doesFileExist f)
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( noChange
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, withPrivData (SshKey keytype user) $ \key -> makeChange $
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writeFileProtected f key
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)
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keyfile = do
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home <- homeDirectory <$> getUserEntryForName user
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return $ home </> ".ssh" </> "id_" ++
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case keytype of
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SshRsa -> "rsa"
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SshDsa -> "dsa"
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