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{-# LANGUAGE FlexibleContexts #-}
module Propellor.Property.Postfix where
import Propellor.Base
import qualified Propellor.Property.Apt as Apt
import qualified Propellor.Property.File as File
import qualified Propellor.Property.Service as Service
import qualified Propellor.Property.User as User
import qualified Data.Map as M
import Data.List
import Data.Char
installed :: Property NoInfo
installed = Apt.serviceInstalledRunning "postfix"
restarted :: Property NoInfo
restarted = Service.restarted "postfix"
reloaded :: Property NoInfo
reloaded = Service.reloaded "postfix"
-- | Configures postfix as a satellite system, which
-- relays all mail through a relay host, which defaults to smtp.domain,
-- but can be changed by @mainCf "relayhost"@.
--
-- The smarthost may refuse to relay mail on to other domains, without
-- further configuration/keys. But this should be enough to get cron job
-- mail flowing to a place where it will be seen.
satellite :: Property NoInfo
satellite = check (not <$> mainCfIsSet "relayhost") setup
`requires` installed
where
setup = property "postfix satellite system" $ do
hn <- asks hostName
let (_, domain) = separate (== '.') hn
ensureProperties
[ Apt.reConfigure "postfix"
[ ("postfix/main_mailer_type", "select", "Satellite system")
, ("postfix/root_address", "string", "root")
, ("postfix/destinations", "string", "localhost")
, ("postfix/mailname", "string", hn)
]
, mainCf ("relayhost", "smtp." ++ domain)
`onChange` reloaded
]
-- | Sets up a file by running a property (which the filename is passed
-- to). If the setup property makes a change, postmap will be run on the
-- file, and postfix will be reloaded.
mappedFile
:: Combines (Property x) (Property NoInfo)
=> FilePath
-> (FilePath -> Property x)
-> Property (CInfo x NoInfo)
mappedFile f setup = setup f
`onChange` (cmdProperty "postmap" [f] `assume` MadeChange)
-- | Run newaliases command, which should be done after changing
-- @/etc/aliases@.
newaliases :: Property NoInfo
newaliases = check ("/etc/aliases" `isNewerThan` "/etc/aliases.db")
(cmdProperty "newaliases" [])
-- | The main config file for postfix.
mainCfFile :: FilePath
mainCfFile = "/etc/postfix/main.cf"
-- | Sets a main.cf @name=value@ pair. Does not reload postfix immediately.
mainCf :: (String, String) -> Property NoInfo
mainCf (name, value) = check notset set
`describe` ("postfix main.cf " ++ setting)
where
setting = name ++ "=" ++ value
notset = (/= Just value) <$> getMainCf name
set = cmdProperty "postconf" ["-e", setting]
-- | Gets a main.cf setting.
getMainCf :: String -> IO (Maybe String)
getMainCf name = parse . lines <$> readProcess "postconf" [name]
where
parse (l:_) = Just $
case separate (== '=') l of
(_, (' ':v)) -> v
(_, v) -> v
parse [] = Nothing
-- | Checks if a main.cf field is set. A field that is set to
-- the empty string is considered not set.
mainCfIsSet :: String -> IO Bool
mainCfIsSet name = do
v <- getMainCf name
return $ v /= Nothing && v /= Just ""
-- | Parses main.cf, and removes any initial configuration lines that are
-- overridden to other values later in the file.
--
-- For example, to add some settings, removing any old settings:
--
-- > mainCf `File.containsLines`
-- > [ "# I like bars."
-- > , "foo = bar"
-- > ] `onChange` dedupMainCf
--
-- Note that multiline configurations that continue onto the next line
-- are not currently supported.
dedupMainCf :: Property NoInfo
dedupMainCf = File.fileProperty "postfix main.cf dedupped" dedupCf mainCfFile
dedupCf :: [String] -> [String]
dedupCf ls =
let parsed = map parse ls
in dedup [] (keycounts $ rights parsed) parsed
where
parse l
| "#" `isPrefixOf` l = Left l
| "=" `isInfixOf` l =
let (k, v) = separate (== '=') l
in Right ((filter (not . isSpace) k), v)
| otherwise = Left l
fmt k v = k ++ " =" ++ v
keycounts = M.fromListWith (+) . map (\(k, _v) -> (k, (1 :: Integer)))
dedup c _ [] = reverse c
dedup c kc ((Left v):rest) = dedup (v:c) kc rest
dedup c kc ((Right (k, v)):rest) = case M.lookup k kc of
Just n | n > 1 -> dedup c (M.insert k (n - 1) kc) rest
_ -> dedup (fmt k v:c) kc rest
-- | Installs saslauthd and configures it for postfix, authenticating
-- against PAM.
--
-- Does not configure postfix to use it; eg @smtpd_sasl_auth_enable = yes@
-- needs to be set to enable use. See
-- <https://wiki.debian.org/PostfixAndSASL>.
--
-- Password brute force attacks are possible when SASL auth is enabled.
-- It would be wise to enable fail2ban, for example:
--
-- > Fail2Ban.jailEnabled "postfix-sasl"
saslAuthdInstalled :: Property NoInfo
saslAuthdInstalled = setupdaemon
`requires` Service.running "saslauthd"
`requires` postfixgroup
`requires` dirperm
`requires` Apt.installed ["sasl2-bin"]
`requires` smtpdconf
where
setupdaemon = "/etc/default/saslauthd" `File.containsLines`
[ "START=yes"
, "OPTIONS=\"-c -m " ++ dir ++ "\""
]
`onChange` Service.restarted "saslauthd"
smtpdconf = "/etc/postfix/sasl/smtpd.conf" `File.containsLines`
[ "pwcheck_method: saslauthd"
, "mech_list: PLAIN LOGIN"
]
dirperm = check (not <$> doesDirectoryExist dir) $
cmdProperty "dpkg-statoverride"
[ "--add", "root", "sasl", "710", dir ]
postfixgroup = (User "postfix") `User.hasGroup` (Group "sasl")
`onChange` restarted
dir = "/var/spool/postfix/var/run/saslauthd"
-- | Uses `saslpasswd2` to set the password for a user in the sasldb2 file.
--
-- The password is taken from the privdata.
saslPasswdSet :: Domain -> User -> Property HasInfo
saslPasswdSet domain (User user) = go `changesFileContent` "/etc/sasldb2"
where
go = withPrivData src ctx $ \getpw ->
property desc $ getpw $ \pw -> liftIO $
withHandle StdinHandle createProcessSuccess p $ \h -> do
hPutStrLn h (privDataVal pw)
hClose h
return NoChange
desc = "sasl password for " ++ uatd
uatd = user ++ "@" ++ domain
ps = ["-p", "-c", "-u", domain, user]
p = proc "saslpasswd2" ps
ctx = Context "sasl"
src = PrivDataSource (Password uatd) "enter password"
|
