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|
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE TupleSections #-}
module LocalPeerCred where
import System.Endian
import qualified Data.ByteString.Lazy.Char8 as L
-- hiding (map,putStrLn,tail,splitAt,tails,filter)
-- import qualified Data.ByteString.Lazy.Char8 as L (splitAt)
import qualified Data.ByteString.Lazy as W8
import Data.List as List (tails,groupBy)
import System.IO ( withFile, IOMode(..))
import System.Directory
import Control.Arrow (first)
import Data.Char
import Data.Maybe
import Data.Binary
import Data.Bits
import System.Posix.Types
import System.Posix.Files
import Logging
import SocketLike
import ControlMaybe
xs ?? n | n < 0 = Nothing
[] ?? _ = Nothing
(x:_) ?? 0 = Just x
(_:xs) ?? n = xs ?? (n-1)
parseHex bs = L.concat . parseHex' $ bs
where
parseHex' bs =
let (dnib,ts) = L.splitAt 2 bs
parseNibble x = W8.pack $ group2 toW8 (W8.unpack $ W8.map hexDigit x)
hexDigit d = d - (if d>0x39 then 0x37 else 0x30)
group2 f (x:y:ys) = f x y : group2 f ys
group2 _ _ = []
toW8 a b = shift a 4 .|. b
in parseNibble dnib :
if L.null ts
then []
else parseHex' ts
getLocalPeerCred' (unmap6mapped4 -> SockAddrInet portn host) = do
let port = fromEnum portn
{- trace ("tcp4 "++show(port,host)) $ -}
withFile "/proc/net/tcp" ReadMode (parseProcNet port host)
getLocalPeerCred' (unmap6mapped4 -> SockAddrInet6 portn flow host scope) = do
let port = fromEnum portn
(a,b,c,d) = host
host' = (toBE32 a, toBE32 b, toBE32 c, toBE32 d)
withFile "/proc/net/tcp6" ReadMode (parseProcNet port host')
getLocalPeerCred' (unmap6mapped4 -> addr@(SockAddrUnix _)) =
-- TODO: parse /proc/net/unix
-- see also: Network.Socket.getPeerCred
return Nothing
getLocalPeerCred sock = do
addr <- getPeerName sock
muid <- getLocalPeerCred' addr
case muid of
Just (uid,inode) -> return (Just uid)
Nothing -> trace "proc failed." $ fmap (validate . CUid . fromIntegral . sndOf3) (getPeerCred sock)
where sndOf3 (pid,uid,gid) = uid
where
validate uid = Just uid -- TODO
from16 :: Word16 -> Int
from16 = fromEnum
as16 :: Word16 -> Word16
as16 = id
parseProcNet port host h = do
tcp <- L.hGetContents h -- Failed: tcp <- hFileSize h >>= hGet h . fromIntegral
let u = do
ls <- listToMaybe . tail . tails . L.lines $ tcp
let ws = map L.words ls
let rs = ( catMaybes . flip map ws $ \xs -> do
let ys = snd (Prelude.splitAt 1 xs)
localaddr <- listToMaybe ys
let zs = L.splitWith (==':') localaddr
addr <- fmap parseHex $ listToMaybe zs
port <- fmap (fromIntegral . as16 . decode . parseHex) $ listToMaybe $ snd (Prelude.splitAt 1 zs)
let ys' = snd (Prelude.splitAt 5 (tail ys))
ys'' = snd (Prelude.splitAt 2 ys')
uid <- listToMaybe ys'
inode <- listToMaybe ys''
let peer = (port,decode addr)
user = toEnum (read (L.unpack uid) ::Int) ::UserID -- CUid . fromIntegral $ (read (unpack uid)::Int)
return $ {-trace ("peer:"++show(peer,user,inode))-} (peer,(user,inode))
)
fmap snd . listToMaybe $ filter ((==(port,host)).fst) rs
{- trace ("found: "++show u) -}
u `seq` return u
{-
where
a === b = let r= a==b in trace ("Comparing "++show (a,b)++"-->"++show r) r
-}
-- PEER NAME: [::ffff:127.0.0.1]:34307
unmap6mapped4 addr@(SockAddrInet6 port _ (0,0,0xFFFF,a) _) = SockAddrInet port (toBE32 a)
unmap6mapped4 addr = addr
identifyTTY ::
[(W8.ByteString, ProcessID)]
-> UserID -> W8.ByteString -> IO (Maybe W8.ByteString, Maybe CPid)
identifyTTY tty_pids uid inode = do
pid <- scanProc (show uid) (L.unpack inode)
-- putStrLn $ "scanProc --> "++show pid
flip (maybe (return (Nothing,Nothing))) pid $ \(pid,ttydev) -> do
tty <- ttyOrDisplay pid ttydev
-- putStrLn $ "users = " ++ show tty_pids
dts <- ttyToXorgs tty_pids
-- putStrLn $ "displays = " ++ show dts
-- putStrLn $ "tty = " ++ show tty
-- -- displays = [(":5",Chunk "tty7" Empty)]
let tty' = if take 3 tty=="tty"
then Just (L.pack tty)
else lookup (parseTty tty) (map (first parseTty) dts)
return (tty',Just pid)
where
parseTty :: String -> Float
parseTty = read . tail . dropWhile (/=':')
ttyToXorgs :: Show a => [(t, a)] -> IO [([Char], t)]
ttyToXorgs tty_pids = do
dts' <- flip mapM tty_pids $ \(tty,pid) -> do
cmd' <- readFile $ "/proc/"++show pid++"/cmdline"
case listToMaybe . words . takeWhile (/='\0') $ cmd' of
Nothing -> return Nothing
Just cmd -> do
if notElem cmd ["gdm-session-worker"]
then return Nothing
else do
display <- readDisplayVariable pid
return (fmap ( (,tty) . snd ) display)
let dts = catMaybes dts'
return dts
scanProc uid inode = do
contents <- getDirectoryContents "/proc" `catchIO_` return []
let pids = reverse $ filter (\n -> not (null n) && isDigit (head n)) contents
let searchPids [] = return Nothing
searchPids (pid:pids) = do
loginuid <- fmap makeUidStr $ readFile $ "/proc/"++pid++"/loginuid"
if False -- (uid/=loginuid) -- this check proved bad when mcabber ran on tty3
then searchPids pids
else do
-- putStrLn $ "pid "++show pid ++ " --> uid "++show loginuid
let loop [] = return Nothing
loop ("0":fds) = loop fds
loop (fd:fds) = do
handleIO_ (loop fds) $ do
what <- readSymbolicLink $ "/proc/"++pid++"/fd/"++fd
-- putStrLn $ " what= "++show what
if (what=="socket:["++inode++"]")
then do
tty <- readSymbolicLink $ "/proc/"++pid++"/fd/0"
return (Just (pid,tty))
else loop fds
-- requires root (or same user as for pid)...
fds <- getDirectoryContents ("/proc/"++pid++"/fd") `catchIO_` return []
mb <- loop fds
maybe (searchPids pids) (return . Just) mb
fmap (fmap (first (read :: String -> CPid))) $ searchPids pids
ttyOrDisplay pid ttydev = do
ptty <- searchParentsForTTY (show pid) ttydev
case ptty of
Just tty -> return tty
Nothing -> do
display <- readDisplayVariable pid
-- putStrLn $ "display = " ++ show display
case display of
Just (_,disp) -> return disp
_ -> return ttydev
readDisplayVariable pid = do
env <- handleIO_ (return "")
. readFile $ "/proc/"++show pid++"/environ"
let vs = unzero $ List.groupBy (\_ c->c/='\0') env
unzero [] = []
unzero (v:vs) = v:map tail vs
keyvalue xs = (key,value)
where
(key,ys) = break (=='=') xs
value = case ys of { [] -> []; (_:ys') -> ys' }
display = listToMaybe
. filter ((=="DISPLAY").fst)
. map keyvalue
$ vs
return display
makeUidStr "4294967295" = "invalid"
makeUidStr uid = uid
searchParentsForTTY pid ttydev | take 8 ttydev == "/dev/tty" = return . Just $ drop 5 ttydev
searchParentsForTTY "1" ttydev | otherwise = return Nothing
searchParentsForTTY pid ttydev = do
stat <- handleIO_ (return "") . readFile $ "/proc/"++pid++"/stat"
case words stat ?? 3 of
Nothing -> return Nothing
Just ppid -> do
tty <- handleIO_ (return "") $ readSymbolicLink $ "/proc/"++ppid++"/fd/0"
searchParentsForTTY ppid tty
|
