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|
{- Credentials storage
-
- Copyright 2012-2014 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Creds (
module Types.Creds,
CredPairStorage(..),
setRemoteCredPair,
getRemoteCredPairFor,
getRemoteCredPair,
getEnvCredPair,
writeCacheCreds,
readCacheCreds,
removeCreds,
includeCredsInfo,
) where
import Common.Annex
import Types.Creds
import Annex.Perms
import Utility.FileMode
import Crypto
import Types.Remote (RemoteConfig, RemoteConfigKey)
import Remote.Helper.Encryptable (remoteCipher, remoteCipher', embedCreds, EncryptionIsSetup, extractCipher)
import Utility.Env (getEnv)
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Map as M
import Utility.Base64
{- A CredPair can be stored in a file, or in the environment, or perhaps
- in a remote's configuration. -}
data CredPairStorage = CredPairStorage
{ credPairFile :: FilePath
, credPairEnvironment :: (String, String)
, credPairRemoteKey :: Maybe RemoteConfigKey
}
{- Stores creds in a remote's configuration, if the remote allows
- that. Also caches them locally.
-
- The creds are found from the CredPairStorage storage if not provided,
- so may be provided by an environment variable etc.
-
- The remote's configuration should have already had a cipher stored in it
- if that's going to be done, so that the creds can be encrypted using the
- cipher. The EncryptionIsSetup phantom type ensures that is the case.
-}
setRemoteCredPair :: EncryptionIsSetup -> RemoteConfig -> CredPairStorage -> Maybe CredPair -> Annex RemoteConfig
setRemoteCredPair encsetup c storage Nothing =
maybe (return c) (setRemoteCredPair encsetup c storage . Just)
=<< getRemoteCredPair c storage
setRemoteCredPair _ c storage (Just creds)
| embedCreds c = case credPairRemoteKey storage of
Nothing -> localcache
Just key -> storeconfig key =<< remoteCipher =<< localcache
| otherwise = localcache
where
localcache = do
writeCacheCredPair creds storage
return c
storeconfig key (Just cipher) = do
s <- liftIO $ encrypt (getGpgEncParams c) cipher
(feedBytes $ L.pack $ encodeCredPair creds)
(readBytes $ return . L.unpack)
return $ M.insert key (toB64 s) c
storeconfig key Nothing =
return $ M.insert key (toB64 $ encodeCredPair creds) c
{- Gets a remote's credpair, from the environment if set, otherwise
- from the cache in gitAnnexCredsDir, or failing that, from the
- value in RemoteConfig. -}
getRemoteCredPairFor :: String -> RemoteConfig -> CredPairStorage -> Annex (Maybe CredPair)
getRemoteCredPairFor this c storage = maybe missing (return . Just) =<< getRemoteCredPair c storage
where
(loginvar, passwordvar) = credPairEnvironment storage
missing = do
warning $ unwords
[ "Set both", loginvar
, "and", passwordvar
, "to use", this
]
return Nothing
getRemoteCredPair :: RemoteConfig -> CredPairStorage -> Annex (Maybe CredPair)
getRemoteCredPair c storage = maybe fromcache (return . Just) =<< fromenv
where
fromenv = liftIO $ getEnvCredPair storage
fromcache = maybe fromconfig (return . Just) =<< readCacheCredPair storage
fromconfig = case credPairRemoteKey storage of
Just key -> do
mcipher <- remoteCipher' c
case (M.lookup key c, mcipher) of
(Nothing, _) -> return Nothing
(Just enccreds, Just (cipher, storablecipher)) ->
fromenccreds enccreds cipher storablecipher
(Just bcreds, Nothing) ->
fromcreds $ fromB64 bcreds
Nothing -> return Nothing
fromenccreds enccreds cipher storablecipher = do
mcreds <- liftIO $ catchMaybeIO $ decrypt cipher
(feedBytes $ L.pack $ fromB64 enccreds)
(readBytes $ return . L.unpack)
case mcreds of
Just creds -> fromcreds creds
Nothing -> do
-- Work around un-encrypted creds storage
-- bug in old S3 and glacier remotes.
-- Not a problem for shared cipher.
case storablecipher of
SharedCipher {} -> showLongNote "gpg error above was caused by an old git-annex bug in credentials storage. Working around it.."
_ -> error "*** Insecure credentials storage detected for this remote! See https://git-annex.branchable.com/upgrades/insecure_embedded_creds/"
fromcreds $ fromB64 enccreds
fromcreds creds = case decodeCredPair creds of
Just credpair -> do
writeCacheCredPair credpair storage
return $ Just credpair
_ -> error "bad creds"
{- Gets a CredPair from the environment. -}
getEnvCredPair :: CredPairStorage -> IO (Maybe CredPair)
getEnvCredPair storage = liftM2 (,)
<$> getEnv uenv
<*> getEnv penv
where
(uenv, penv) = credPairEnvironment storage
writeCacheCredPair :: CredPair -> CredPairStorage -> Annex ()
writeCacheCredPair credpair storage =
writeCacheCreds (encodeCredPair credpair) (credPairFile storage)
{- Stores the creds in a file inside gitAnnexCredsDir that only the user
- can read. -}
writeCacheCreds :: Creds -> FilePath -> Annex ()
writeCacheCreds creds file = do
d <- fromRepo gitAnnexCredsDir
createAnnexDirectory d
liftIO $ writeFileProtected (d </> file) creds
readCacheCredPair :: CredPairStorage -> Annex (Maybe CredPair)
readCacheCredPair storage = maybe Nothing decodeCredPair
<$> readCacheCreds (credPairFile storage)
readCacheCreds :: FilePath -> Annex (Maybe Creds)
readCacheCreds f = liftIO . catchMaybeIO . readFile =<< cacheCredsFile f
cacheCredsFile :: FilePath -> Annex FilePath
cacheCredsFile basefile = do
d <- fromRepo gitAnnexCredsDir
return $ d </> basefile
existsCacheCredPair :: CredPairStorage -> Annex Bool
existsCacheCredPair storage =
liftIO . doesFileExist =<< cacheCredsFile (credPairFile storage)
encodeCredPair :: CredPair -> Creds
encodeCredPair (l, p) = unlines [l, p]
decodeCredPair :: Creds -> Maybe CredPair
decodeCredPair creds = case lines creds of
l:p:[] -> Just (l, p)
_ -> Nothing
removeCreds :: FilePath -> Annex ()
removeCreds file = do
d <- fromRepo gitAnnexCredsDir
let f = d </> file
liftIO $ nukeFile f
includeCredsInfo :: RemoteConfig -> CredPairStorage -> [(String, String)] -> Annex [(String, String)]
includeCredsInfo c storage info = do
v <- liftIO $ getEnvCredPair storage
case v of
Just _ -> do
let (uenv, penv) = credPairEnvironment storage
ret $ "from environment variables (" ++ unwords [uenv, penv] ++ ")"
Nothing -> case (`M.lookup` c) =<< credPairRemoteKey storage of
Nothing -> ifM (existsCacheCredPair storage)
( ret "stored locally"
, ret "not available"
)
Just _ -> case extractCipher c of
Just (EncryptedCipher {}) -> ret "embedded in git repository (gpg encrypted)"
_ -> ret "embedded in git repository (not encrypted)"
where
ret s = return $ ("creds", s) : info
|
