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|
-- | Maintainer: Arnaud Bailly <arnaud.oqube@gmail.com>
--
-- Properties for configuring firewall (iptables) rules
module Propellor.Property.Firewall (
rule,
installed,
Chain(..),
Table(..),
TargetFilter(..),
TargetNat(..),
TargetMangle(..),
TargetRaw(..),
TargetSecurity(..),
Proto(..),
Rules(..),
ConnectionState(..),
IPWithMask(..),
fromIPWithMask
) where
import Data.Monoid
import Data.Char
import Data.List
import Propellor.Base
import qualified Propellor.Property.Apt as Apt
import qualified Propellor.Property.Network as Network
installed :: Property NoInfo
installed = Apt.installed ["iptables"]
rule :: Chain -> Table -> Rules -> Property NoInfo
rule c t rs = property ("firewall rule: " <> show r) addIpTable
where
r = Rule c t rs
addIpTable = liftIO $ do
let args = toIpTable r
exist <- boolSystem "iptables" (chk args)
if exist
then return NoChange
else toResult <$> boolSystem "iptables" (add args)
add params = Param "-A" : params
chk params = Param "-C" : params
toIpTable :: Rule -> [CommandParam]
toIpTable r = map Param $
show (ruleChain r) :
toIpTableArg (ruleRules r) ++ toIpTableTable (ruleTable r)
toIpTableArg :: Rules -> [String]
toIpTableArg Everything = []
toIpTableArg (Proto proto) = ["-p", map toLower $ show proto]
toIpTableArg (DPort (Port port)) = ["--dport", show port]
toIpTableArg (DPortRange (Port f, Port t)) =
["--dport", show f ++ ":" ++ show t]
toIpTableArg (InIFace iface) = ["-i", iface]
toIpTableArg (OutIFace iface) = ["-o", iface]
toIpTableArg (Ctstate states) =
[ "-m"
, "conntrack"
, "--ctstate", intercalate "," (map show states)
]
toIpTableArg (Source ipwm) =
[ "-s"
, intercalate "," (map fromIPWithMask ipwm)
]
toIpTableArg (Destination ipwm) =
[ "-d"
, intercalate "," (map fromIPWithMask ipwm)
]
toIpTableArg (r :- r') = toIpTableArg r <> toIpTableArg r'
data IPWithMask = IPWithNoMask IPAddr | IPWithIPMask IPAddr IPAddr | IPWithNumMask IPAddr Int
deriving (Eq, Show)
fromIPWithMask :: IPWithMask -> String
fromIPWithMask (IPWithNoMask ip) = fromIPAddr ip
fromIPWithMask (IPWithIPMask ip ipm) = fromIPAddr ip ++ "/" ++ fromIPAddr ipm
fromIPWithMask (IPWithNumMask ip m) = fromIPAddr ip ++ "/" ++ show m
data Rule = Rule
{ ruleChain :: Chain
, ruleTable :: Table
, ruleRules :: Rules
} deriving (Eq, Show)
data Table = Filter TargetFilter | Nat TargetNat | Mangle TargetMangle | Raw TargetRaw | Security TargetSecurity
deriving (Eq, Show)
toIpTableTable :: Table -> [String]
toIpTableTable f = ["-t", table, "-j", target]
where
(table, target) = toIpTableTable' f
toIpTableTable' :: Table -> (String, String)
toIpTableTable' (Filter target) = ("filter", fromTarget target)
toIpTableTable' (Nat target) = ("nat", fromTarget target)
toIpTableTable' (Mangle target) = ("mangle", fromTarget target)
toIpTableTable' (Raw target) = ("raw", fromTarget target)
toIpTableTable' (Security target) = ("security", fromTarget target)
data Chain = INPUT | OUTPUT | FORWARD
deriving (Eq, Show)
data TargetFilter = ACCEPT | REJECT | DROP | LOG | FilterCustom String
deriving (Eq, Show)
class FromTarget a where
fromTarget :: a -> String
instance FromTarget TargetFilter where
fromTarget ACCEPT = "ACCEPT"
fromTarget REJECT = "REJECT"
fromTarget DROP = "DROP"
fromTarget LOG = "LOG"
fromTarget (FilterCustom f) = f
data TargetNat = NatPREROUTING | NatOUTPUT | NatPOSTROUTING | NatCustom String
deriving (Eq, Show)
instance FromTarget TargetNat where
fromTarget NatPREROUTING = "PREROUTING"
fromTarget NatOUTPUT = "OUTPUT"
fromTarget NatPOSTROUTING = "POSTROUTING"
fromTarget (NatCustom f) = f
data TargetMangle = ManglePREROUTING | MangleOUTPUT | MangleINPUT | MangleFORWARD | ManglePOSTROUTING | MangleCustom String
deriving (Eq, Show)
instance FromTarget TargetMangle where
fromTarget ManglePREROUTING = "PREROUTING"
fromTarget MangleOUTPUT = "OUTPUT"
fromTarget MangleINPUT = "INPUT"
fromTarget MangleFORWARD = "FORWARD"
fromTarget ManglePOSTROUTING = "POSTROUTING"
fromTarget (MangleCustom f) = f
data TargetRaw = RawPREROUTING | RawOUTPUT | RawCustom String
deriving (Eq, Show)
instance FromTarget TargetRaw where
fromTarget RawPREROUTING = "PREROUTING"
fromTarget RawOUTPUT = "OUTPUT"
fromTarget (RawCustom f) = f
data TargetSecurity = SecurityINPUT | SecurityOUTPUT | SecurityFORWARD | SecurityCustom String
deriving (Eq, Show)
instance FromTarget TargetSecurity where
fromTarget SecurityINPUT = "INPUT"
fromTarget SecurityOUTPUT = "OUTPUT"
fromTarget SecurityFORWARD = "FORWARD"
fromTarget (SecurityCustom f) = f
data Proto = TCP | UDP | ICMP
deriving (Eq, Show)
data ConnectionState = ESTABLISHED | RELATED | NEW | INVALID
deriving (Eq, Show)
data Rules
= Everything
| Proto Proto
-- ^There is actually some order dependency between proto and port so this should be a specific
-- data type with proto + ports
| DPort Port
| DPortRange (Port,Port)
| InIFace Network.Interface
| OutIFace Network.Interface
| Ctstate [ ConnectionState ]
| Source [ IPWithMask ]
| Destination [ IPWithMask ]
| Rules :- Rules -- ^Combine two rules
deriving (Eq, Show)
infixl 0 :-
instance Monoid Rules where
mempty = Everything
mappend = (:-)
|
