graphql-engine/server/src-lib/Hasura/Server/Auth/JWT/Internal.hs
Brandon Simmons b167120f96 server: add explicit export lists in OSS server and enforce with warning
We'll see if this improves compile times at all, but I think it's worth
doing as at least the most minimal form of module documentation.

This was accomplished by first compiling everything with
-ddump-minimal-imports, and then a bunch of scripting (with help from
ormolu)

**EDIT** it doesn't seem to improve CI compile times but the noise floor is high as it looks like we're not caching library dependencies anymore

PR-URL: https://github.com/hasura/graphql-engine-mono/pull/2730
GitOrigin-RevId: 667eb8de1e0f1af70420cbec90402922b8b84cb4
2021-11-04 16:09:38 +00:00

121 lines
3.8 KiB
Haskell

module Hasura.Server.Auth.JWT.Internal
( parseEdDSAKey,
parseHmacKey,
parseRsaKey,
)
where
import Control.Lens
import Crypto.JOSE.Types (Base64Integer (..))
import Crypto.JWT
import Crypto.PubKey.RSA (PublicKey (..))
import Data.ASN1.BinaryEncoding (DER (..))
import Data.ASN1.Encoding (decodeASN1')
import Data.ASN1.Types
( ASN1 (End, IntVal, Start),
ASN1ConstructionType (Sequence),
fromASN1,
)
import Data.ByteString.Lazy qualified as BL
import Data.Int (Int64)
import Data.PEM qualified as PEM
import Data.Text qualified as T
import Data.Text.Conversions
import Data.X509 qualified as X509
import Hasura.Prelude
import Hasura.Server.Utils (fmapL)
-- | Helper functions to decode Text to JWK
parseHmacKey :: Text -> Int64 -> Either Text JWK
parseHmacKey key size = do
let secret = unUTF8 $ fromText key
err s = "Key size too small; should be atleast " <> show (s `div` 8) <> " characters"
if BL.length secret < size `div` 8
then Left . T.pack $ err size
else pure $ fromOctets secret
parseRsaKey :: Text -> Either Text JWK
parseRsaKey key = do
let res = fromRawPem (unUTF8 $ fromText key)
err e = "Could not decode PEM: " <> e
onLeft res (Left . err)
parseEdDSAKey :: Text -> Either Text JWK
parseEdDSAKey key = do
let res = fromRawPem (unUTF8 $ fromText key)
err e = "Could not decode PEM: " <> e
onLeft res (Left . err)
-- | Helper functions to decode PEM bytestring to RSA public key
-- try PKCS first, then x509
fromRawPem :: BL.ByteString -> Either Text JWK
fromRawPem bs =
-- pubKeyToJwk <=< fromPkcsPem
case fromPkcsPem bs of
Right pk -> pubKeyToJwk pk
Left e ->
case fromX509Pem bs of
Right pk1 -> pubKeyToJwk pk1
Left e1 -> Left (e <> " " <> e1)
-- decode a PKCS1 or PKCS8 PEM to obtain the public key
fromPkcsPem :: BL.ByteString -> Either Text X509.PubKey
fromPkcsPem bs = do
pems <- fmapL T.pack $ PEM.pemParseLBS bs
pem <- getAtleastOne "No pem found" pems
res <- fmapL tshow $ decodeASN1' DER $ PEM.pemContent pem
case res of
-- PKCS#1 format
[Start Sequence, IntVal n, IntVal e, End Sequence] ->
return $ X509.PubKeyRSA $ PublicKey (calculateSize n) n e
-- try and see if its a PKCS#8 format
asn1 -> do
(pub, xs) <- fmapL T.pack $ fromASN1 asn1
unless (null xs) (Left "Could not decode public key")
return pub
-- decode a x509 certificate containing the RSA public key or EdDSA (ed25519) public key
fromX509Pem :: BL.ByteString -> Either Text X509.PubKey
fromX509Pem s = do
-- try to parse bytestring to a [PEM]
pems <- fmapL T.pack $ PEM.pemParseLBS s
-- fail if [PEM] is empty
pem <- getAtleastOne "No pem found" pems
-- decode the bytestring to a certificate
signedExactCert <-
fmapL T.pack $
X509.decodeSignedCertificate $
PEM.pemContent pem
let cert = X509.signedObject $ X509.getSigned signedExactCert
pubKey = X509.certPubKey cert
case pubKey of
X509.PubKeyRSA pk -> return $ X509.PubKeyRSA pk
X509.PubKeyEd25519 pk -> return $ X509.PubKeyEd25519 pk
_ -> Left "Could not decode RSA or EdDSA public key from x509 cert"
pubKeyToJwk :: X509.PubKey -> Either Text JWK
pubKeyToJwk pubKey = do
jwk' <- mkJwk
return $ jwk' & jwkKeyOps .~ Just [Verify]
where
mkJwk = case pubKey of
X509.PubKeyRSA (PublicKey _ n e) ->
return $ fromKeyMaterial $ RSAKeyMaterial (rsaKeyParams n e)
X509.PubKeyEd25519 pubKeyEd ->
return $ fromKeyMaterial $ OKPKeyMaterial (Ed25519Key pubKeyEd Nothing)
_ -> Left "This key type is not supported"
rsaKeyParams n e =
RSAKeyParameters (Base64Integer n) (Base64Integer e) Nothing
getAtleastOne :: Text -> [a] -> Either Text a
getAtleastOne err [] = Left err
getAtleastOne _ (x : _) = Right x
calculateSize :: Integer -> Int
calculateSize = go 1
where
go i n
| 2 ^ (i * 8) > n = i
| otherwise = go (i + 1) n