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{-# LANGUAGE OverloadedStrings, ViewPatterns #-}
-- validatecert.hs
--
-- translation of cert_valid.pl into haskell
import Data.Char
import Data.Monoid
import Data.List
import Data.Maybe
import qualified Data.Map as Map
import qualified Data.ByteString.Char8 as S
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.X509 as X509
import Control.Monad
import Control.Monad.Fix
import System.IO.Error
import System.IO
import Data.Map ( Map )
import Data.Time.LocalTime ( getZonedTime )
import Data.Time.Format ( formatTime )
import Data.X509 as X509 ( SignedCertificate, decodeSignedObject )
import System.Exit
import System.Posix.Process ( getProcessID )
import System.Locale ( defaultTimeLocale )
import System.Environment ( getProgName, getArgs )
import ScanningParser
import PEM
continue e body = either (const $ return ()) body e
digits s = S.all isDigit s
bshow :: Show x => x -> S.ByteString
bshow = S.pack . show
toS = foldl1' (<>) . L.toChunks
parseHeader :: S.ByteString -> Either S.ByteString (S.ByteString, S.ByteString, Int, S.ByteString)
parseHeader first_line = parseHeaderWords $ S.words first_line
where
parseHeaderWords (channelId:code:bodylen:body:ignored) | not (digits channelId)
= Left $ channelId <> " BH message=\"This helper is concurrent and requires\
\ the concurrency option to be specified.\"\1"
parseHeaderWords (channelId:code:bodylen:body:ignored) | not (digits bodylen)
= Left $ channelId <> " BH message=\"cert validator request syntax error.\" \1";
parseHeaderWords (channelId:code:bodylen:body:ignored)
= Right ( channelId
, code
, read $ S.unpack bodylen
, body <> "\n"
)
parseHeaderWords (channelId:_)
= Left $ channelId <> " BH message=\"Insufficient words in message.\"\1"
parseHeaderWords []
= Left ""
data ValidationError = ValidationError
{ veName :: S.ByteString
, veCert :: S.ByteString
, veReason :: S.ByteString
}
type Cert = SignedCertificate -- PEMBlob
pemToCert :: PEMBlob -> Maybe Cert
pemToCert pem = either (const Nothing) Just $ decodeSignedObject obj
where
obj = foldl1' (<>) $ L.toChunks $ pemBlob pem
certSubject :: Cert -> S.ByteString
certSubject cert = maybe "" X509.getCharacterStringRawData
$ foldr1 mplus [cn,ou,o]
where
dn = X509.certSubjectDN $ X509.getCertificate cert
cn = X509.getDnElement X509.DnCommonName dn
ou = X509.getDnElement X509.DnOrganizationUnit dn
o = X509.getDnElement X509.DnOrganization dn
data ValidationRequest = ValidationRequest
{ vrHostname :: S.ByteString
, vrErrors :: Map S.ByteString ValidationError
, vrCerts :: Map S.ByteString Cert
, vrSyntaxErrors :: [L.ByteString]
, vrPeerCertId :: Maybe S.ByteString
}
main = do
debug <- do
args <- getArgs
when (not $ null $ ["-h","--help"] `intersect` args) $ do
me <- getProgName
hPutStr stderr $ usage me
[(["-h","--help"], "brief help message")
,(["-d","--debug"], "enable debug messages to stderr")]
exitSuccess
return $ not $ null $ ["-d","--debug"] `intersect` args
fix $ \next -> do
e <- tryIOError S.getLine
continue e $ \first_line -> do
when (S.all isSpace first_line)
next
let wlog' s | S.null s = return ()
| debug = wlog s
| otherwise = return ()
flip (either wlog') (parseHeader first_line) $ \(channelId,code,bodylen,body0) -> do
when debug $ wlog $ "GOT " <> "Code=" <> code <> " " <> bshow bodylen <> "\n"
body1 <- L.hGet stdin (bodylen - S.length body0)
`catchIOError` (const $ return "")
let body = L.fromChunks $ body0 : L.toChunks body1
req = parseRequest body
when debug $ forM_ (vrSyntaxErrors req) $ \request -> do
wlog $ "ParseError on \"" <> toS request <> "\"\n"
when debug $ do
wlog $ "Parse result:\n"
wlog $ "\tHOST: " <> vrHostname req <> "\n"
maybe (return ())
(\certid -> wlog $ "\tCERT: " <> certid <> "\n")
$ vrPeerCertId req
let estr = S.intercalate "," $ map showe $ Map.elems $ vrErrors req
showe e = veName e <> "/" <> veCert e
wlog $ "\tERRORS: " <> estr <> "\n"
forM_ (Map.toList $ vrCerts req) $ \(key,cert) -> do
wlog $ "\tCHAIN " <> key <> ": " <> certSubject cert <> "\n"
let responseErrors = fmap (\ve -> ve { veReason = "Checked by validatecert.hs" }) $ vrErrors req
response0 = createResponse req responseErrors
len = bshow $ S.length response0
response = if Map.null responseErrors
then channelId <> " OK " <> len <> " " <> response0 <> "\1"
else channelId <> " ERR " <> len <> " " <> response0 <> "\1"
S.putStr response
hFlush stdout
when debug $ forM_ (S.lines $ S.init response) $ \msg -> do
wlog $ ">> " <> msg <> "\n"
next
createResponse :: ValidationRequest -> Map S.ByteString ValidationError -> S.ByteString
createResponse vr responseErrors = S.concat $ zipWith mkresp [0..] $ Map.elems responseErrors
where
mkresp i err = "error_name_" <> bshow i <> "=" <> veName err <> "\n"
<>"error_reason_" <> bshow i <> "=" <> veReason err <> "\n"
<>"error_cert_" <> bshow i <> "=" <> veCert err <> "\n"
-- vrCertFromErr err = vrCerts vr Map.! veCert err
parseRequest :: L.ByteString -> ValidationRequest
parseRequest body = parseRequest0 vr0 body
where
vr0 = ValidationRequest { vrHostname = ""
, vrErrors = Map.empty
, vrCerts = Map.empty
, vrSyntaxErrors = []
, vrPeerCertId = Nothing
}
ve0 = ValidationError { veName = ""
, veCert = ""
, veReason = ""
}
parseRequest0 :: ValidationRequest -> L.ByteString -> ValidationRequest
parseRequest0 vr request | L.all isSpace request = vr
parseRequest0 vr (splitEq -> Just ("host",L.break (=='\n')->(hostname,rs)))
= parseRequest0 vr' rs
where vr' = vr { vrHostname = toS hostname }
parseRequest0 vr (splitEq -> Just (var,cert)) | "cert_" `L.isPrefixOf` var
= parseRequest0 vr' $ L.unlines rs
where vr' = maybe vr upd $ mb >>= pemToCert
upd cert = vr { vrCerts = Map.insert (toS var)
cert
$ vrCerts vr
, vrPeerCertId = Just $ fromMaybe (toS var) $ vrPeerCertId vr }
p = pemParser (Just "CERTIFICATE")
(mb,rs) = scanAndParse1 p $ L.lines cert
parseRequest0 vr (digitsId . splitEq -> Just (("error_name",d),L.break (=='\n')->(errorName,rs)))
= parseRequest0 vr' rs
where vr' = vr { vrErrors = Map.alter (setErrorName errorName) (toS d) $ vrErrors vr }
parseRequest0 vr (digitsId . splitEq -> Just (("error_cert",d),L.break (=='\n')->(certId,rs)))
= parseRequest0 vr' rs
where vr' = vr { vrErrors = Map.alter (setErrorCert certId) (toS d) $ vrErrors vr }
parseRequest0 vr req = vr'
where
vr' = vr { vrSyntaxErrors = syntaxError $ vrSyntaxErrors vr }
syntaxError es = es ++ [ req ]
setErrorName :: L.ByteString -> Maybe ValidationError -> Maybe ValidationError
setErrorName x mb = maybe (Just $ ve0 { veName = toS x })
(\ve -> Just $ ve { veName = toS x })
mb
setErrorCert :: L.ByteString -> Maybe ValidationError -> Maybe ValidationError
setErrorCert x mb = maybe (Just $ ve0 { veCert = toS x })
(\ve -> Just $ ve { veCert = toS x })
mb
digitsId mb = do
(n,v) <- mb
let (n',tl) = L.span isDigit $ L.reverse n
if "_" `L.isPrefixOf` tl
then Just ( (L.reverse $ L.drop 1 tl, L.reverse n'), v )
else Nothing
splitEq request = if L.null tl then Nothing
else Just (hd,L.drop 1 tl)
where
(hd,tl) = L.break (=='=') $ L.dropWhile isSpace request
wlog msg = do
now <- getZonedTime
pid <- getProcessID
self <- getProgName
hPutStr stderr $
formatTime defaultTimeLocale "%Y/%m/%d %H:%M:%S.0" now
<> " " <> self
<> " " <> show pid
<> " | " <> S.unpack msg
hFlush stderr
usage :: String -> [([String],String)] -> String
usage cmdname argspec = unlines $ intercalate [""] $
[ "Usage:"
, tab <> cmdname <> " " <> breif argspec
] : map helptext argspec
where
tab = " "
tabbb = tab <> tab <> tab
alts as = intercalate " | " as
bracket s = "[" <> s <> "]"
breif spec = intercalate " " $ map (bracket . alts . fst) spec
helptext (as,help) = [ tab <> alts as
, tabbb <> help ]
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