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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Network.ACME.Encoding (
thumbprint,
JWK(..),
toStrict,
csr,
challenge,
registration,
authz,
signPayload',
) where
import Crypto.Number.Serialize (i2osp)
import Data.Aeson (ToJSON (..), encode, object, (.=))
import Data.ByteString (ByteString)
import qualified Data.ByteString as B
import qualified Data.ByteString.Base64.URL as Base64
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString.Lazy as LB
import qualified Data.ByteString.Lazy.Char8 as LC
import Data.Digest.Pure.SHA (bytestringDigest, sha256)
import Data.Maybe
import Data.Text.Encoding (decodeUtf8)
import OpenSSL
import OpenSSL.RSA
import Text.Email.Validate
import qualified Data.Text as T
--------------------------------------------------------------------------------
-- | Sign return a payload with a nonce-protected header.
signPayload' :: (ByteString -> IO ByteString) -> RSAPubKey -> String -> ByteString -> IO LC.ByteString
signPayload' sign pub nonce_ payload = withOpenSSL $ do
let protected = b64 (header pub nonce_)
sig <- b64 <$> sign (B.concat [protected, ".", payload])
return $ encode (Request (header' pub) protected payload sig)
--------------------------------------------------------------------------------
-- | Base64URL encoding of Integer with padding '=' removed.
b64i :: Integer -> ByteString
b64i = b64 . i2osp
b64 :: ByteString -> ByteString
b64 = B.takeWhile (/= 61) . Base64.encode
toStrict :: LB.ByteString -> ByteString
toStrict = B.concat . LB.toChunks
header' :: RSAKey k => k -> Header
header' key = Header "RS256" (JWK (rsaE key) "RSA" (rsaN key)) Nothing
header :: RSAKey k => k -> String -> ByteString
header key nonce = (toStrict . encode)
(Header "RS256" (JWK (rsaE key) "RSA" (rsaN key)) (Just nonce))
-- | Registration payload to sign with user key.
registration :: EmailAddress -> String -> ByteString
registration emailAddr terms = (b64 . toStrict . encode) (Reg emailAddr terms)
-- | Challenge request payload to sign with user key.
authz :: String -> ByteString
authz = b64. toStrict . encode . Authz
-- | Challenge response payload to sign with user key.
challenge :: ByteString -> ByteString
challenge = b64 . toStrict . encode . Challenge . BC.unpack
-- | CSR request payload to sign with user key.
csr :: ByteString -> ByteString
csr = b64 . toStrict . encode . CSR . b64
thumbprint :: JWK -> ByteString
thumbprint = b64 . toStrict . bytestringDigest . sha256 . encodeOrdered
-- | There is an `encodePretty'` in `aeson-pretty`, but do it by hand here.
encodeOrdered :: JWK -> LB.ByteString
encodeOrdered JWK{..} = LC.pack $
"{\"e\":\"" ++ hE' ++ "\",\"kty\":\"" ++ hKty ++ "\",\"n\":\"" ++ hN' ++ "\"}"
where
hE' = BC.unpack (b64i hE)
hN' = BC.unpack (b64i hN)
--------------------------------------------------------------------------------
data Header = Header
{ hAlg :: String
, hJwk :: JWK
, hNonce :: Maybe String
}
deriving Show
data JWK = JWK
{ hE :: Integer
, hKty :: String
, hN :: Integer
}
deriving Show
instance ToJSON Header where
toJSON Header{..} = object $
[ "alg" .= hAlg
, "jwk" .= toJSON hJwk
] ++ maybeToList (("nonce" .=) <$> hNonce)
instance ToJSON JWK where
toJSON JWK{..} = object
[ "e" .= decodeUtf8 (b64i hE)
, "kty" .= hKty
, "n" .= decodeUtf8 (b64i hN)
]
data Reg = Reg
{ rMail :: EmailAddress
, rAgreement :: String
}
deriving Show
instance ToJSON Reg where
toJSON Reg{..} = object
[ "resource" .= ("new-reg" :: String)
, "contact" .= ["mailto:" ++ (T.unpack . decodeUtf8 . toByteString $ rMail)]
, "agreement" .= rAgreement
]
data Request = Request
{ rHeader :: Header
, rProtected :: ByteString
, rPayload :: ByteString
, rSignature :: ByteString
}
deriving Show
instance ToJSON Request where
toJSON Request{..} = object
[ "header" .= toJSON rHeader
, "protected" .= decodeUtf8 rProtected
, "payload" .= decodeUtf8 rPayload
, "signature" .= decodeUtf8 rSignature
]
data Authz = Authz
{ aDomain :: String
}
instance ToJSON Authz where
toJSON Authz{..} = object
[ "resource" .= ("new-authz" :: String)
, "identifier" .= object
[ "type" .= ("dns" :: String)
, "value" .= aDomain
]
]
data Challenge = Challenge
{ cKeyAuth :: String
}
instance ToJSON Challenge where
toJSON Challenge{..} = object
[ "resource" .= ("challenge" :: String)
, "keyAuthorization" .= cKeyAuth
]
data CSR = CSR ByteString
deriving Show
instance ToJSON CSR where
toJSON (CSR s) = object
[ "resource" .= ("new-cert" :: String)
, "csr" .= decodeUtf8 s
]
|
