c498269a88
Needed so Remote.External can query the external program for its configs. When the external program does not support the query, the passthrough option will make all input fields be available.
490 lines
17 KiB
Haskell
490 lines
17 KiB
Haskell
{- git remotes encrypted using git-remote-gcrypt
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-
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- Copyright 2013 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE OverloadedStrings #-}
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module Remote.GCrypt (
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remote,
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chainGen,
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getGCryptUUID,
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coreGCryptId,
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setupRepo,
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accessShellConfig,
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setGcryptEncryption,
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) where
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import qualified Data.Map as M
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Lazy as L
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import Control.Exception
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import Data.Default
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import Annex.Common
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import qualified Annex
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import Types.Remote
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import Types.GitConfig
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import Types.Crypto
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import Types.Creds
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import Types.Transfer
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import Git.Types (ConfigKey(..), fromConfigKey, fromConfigValue)
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import qualified Git
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import qualified Git.Command
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import qualified Git.Config
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import qualified Git.GCrypt
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import qualified Git.Construct
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import qualified Annex.Branch
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import Config
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import Config.Cost
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import Annex.SpecialRemote.Config
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import Remote.Helper.Git
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import Remote.Helper.Encryptable
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import Remote.Helper.Special
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import Remote.Helper.Messages
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import Remote.Helper.ExportImport
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import qualified Remote.Helper.Ssh as Ssh
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import Utility.Metered
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import Annex.UUID
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import Annex.Ssh
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import qualified Remote.Rsync
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import qualified Remote.Directory
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import Utility.Rsync
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import Utility.Tmp
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import Logs.Remote
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import Utility.Gpg
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import Utility.SshHost
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import Messages.Progress
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import Types.ProposedAccepted
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remote :: RemoteType
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remote = specialRemoteType $ RemoteType
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{ typename = "gcrypt"
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-- Remote.Git takes care of enumerating gcrypt remotes too,
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-- and will call our gen on them.
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, enumerate = const (return [])
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, generate = gen
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, configParser = mkRemoteConfigParser
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[optionalStringParser gitRepoField]
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, setup = gCryptSetup
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, exportSupported = exportUnsupported
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, importSupported = importUnsupported
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}
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gitRepoField :: RemoteConfigField
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gitRepoField = Accepted "gitrepo"
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chainGen :: Git.Repo -> UUID -> ParsedRemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
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chainGen gcryptr u c gc rs = do
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g <- gitRepo
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-- get underlying git repo with real path, not gcrypt path
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r <- liftIO $ Git.GCrypt.encryptedRemote g gcryptr
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let r' = r { Git.remoteName = Git.remoteName gcryptr }
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gen r' u c gc rs
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gen :: Git.Repo -> UUID -> ParsedRemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
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gen baser u c gc rs = do
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-- doublecheck that cache matches underlying repo's gcrypt-id
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-- (which might not be set), only for local repos
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(mgcryptid, r) <- getGCryptId True baser gc
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g <- gitRepo
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case (mgcryptid, Git.GCrypt.remoteRepoId g (Git.remoteName baser)) of
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(Just gcryptid, Just cachedgcryptid)
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| gcryptid /= cachedgcryptid -> resetup gcryptid r
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_ -> gen' r u c gc rs
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where
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-- A different drive may have been mounted, making a different
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-- gcrypt remote available. So need to set the cached
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-- gcrypt-id and annex-uuid of the remote to match the remote
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-- that is now available. Also need to set the gcrypt particiants
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-- correctly.
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resetup gcryptid r = do
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let u' = genUUIDInNameSpace gCryptNameSpace gcryptid
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v <- M.lookup u' <$> readRemoteLog
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case (Git.remoteName baser, v) of
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(Just remotename, Just c') -> do
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pc <- either giveup return
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. parseRemoteConfig c'
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=<< configParser remote
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setGcryptEncryption pc remotename
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storeUUIDIn (remoteConfig baser "uuid") u'
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setConfig (Git.GCrypt.remoteConfigKey "gcrypt-id" remotename) gcryptid
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gen' r u' pc gc rs
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_ -> do
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warning $ "not using unknown gcrypt repository pointed to by remote " ++ Git.repoDescribe r
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return Nothing
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gen' :: Git.Repo -> UUID -> ParsedRemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
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gen' r u c gc rs = do
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cst <- remoteCost gc $
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if repoCheap r then nearlyCheapRemoteCost else expensiveRemoteCost
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(rsynctransport, rsyncurl) <- rsyncTransportToObjects r gc
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let rsyncopts = Remote.Rsync.genRsyncOpts c gc rsynctransport rsyncurl
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let this = Remote
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{ uuid = u
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, cost = cst
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, name = Git.repoDescribe r
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, storeKey = storeKeyDummy
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, retrieveKeyFile = retreiveKeyFileDummy
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, retrieveKeyFileCheap = \_ _ _ -> return False
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, retrievalSecurityPolicy = RetrievalAllKeysSecure
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, removeKey = removeKeyDummy
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, lockContent = Nothing
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, checkPresent = checkPresentDummy
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, checkPresentCheap = repoCheap r
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, exportActions = exportUnsupported
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, importActions = importUnsupported
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, whereisKey = Nothing
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, remoteFsck = Nothing
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, repairRepo = Nothing
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, config = c
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, localpath = localpathCalc r
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, getRepo = return r
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, gitconfig = gc
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, readonly = Git.repoIsHttp r
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, appendonly = False
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, availability = availabilityCalc r
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, remotetype = remote
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, mkUnavailable = return Nothing
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, getInfo = gitRepoInfo this
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, claimUrl = Nothing
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, checkUrl = Nothing
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, remoteStateHandle = rs
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}
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return $ Just $ specialRemote' specialcfg c
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(simplyPrepare $ store this rsyncopts)
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(simplyPrepare $ retrieve this rsyncopts)
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(simplyPrepare $ remove this rsyncopts)
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(simplyPrepare $ checkKey this rsyncopts)
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this
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where
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specialcfg
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| Git.repoIsUrl r = (specialRemoteCfg c)
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-- Rsync displays its own progress.
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{ displayProgress = False }
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| otherwise = specialRemoteCfg c
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rsyncTransportToObjects :: Git.Repo -> RemoteGitConfig -> Annex (Annex [CommandParam], String)
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rsyncTransportToObjects r gc = do
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(rsynctransport, rsyncurl, _) <- rsyncTransport r gc
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return (rsynctransport, rsyncurl ++ "/annex/objects")
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rsyncTransport :: Git.Repo -> RemoteGitConfig -> Annex (Annex [CommandParam], String, AccessMethod)
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rsyncTransport r gc
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| sshprefix `isPrefixOf` loc = sshtransport $ break (== '/') $ drop (length sshprefix) loc
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| "//:" `isInfixOf` loc = othertransport
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| ":" `isInfixOf` loc = sshtransport $ separate (== ':') loc
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| otherwise = othertransport
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where
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sshprefix = "ssh://" :: String
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loc = Git.repoLocation r
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sshtransport (host, path) = do
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let rsyncpath = if "/~/" `isPrefixOf` path
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then drop 3 path
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else path
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let sshhost = either error id (mkSshHost host)
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let mkopts = rsyncShell . (Param "ssh" :)
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<$> sshOptions ConsumeStdin (sshhost, Nothing) gc []
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return (mkopts, fromSshHost sshhost ++ ":" ++ rsyncpath, AccessShell)
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othertransport = return (pure [], loc, AccessDirect)
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noCrypto :: Annex a
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noCrypto = giveup "cannot use gcrypt remote without encryption enabled"
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unsupportedUrl :: a
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unsupportedUrl = giveup "using non-ssh remote repo url with gcrypt is not supported"
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gCryptSetup :: SetupStage -> Maybe UUID -> Maybe CredPair -> RemoteConfig -> RemoteGitConfig -> Annex (RemoteConfig, UUID)
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gCryptSetup _ mu _ c gc = go $ fromProposedAccepted <$> M.lookup gitRepoField c
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where
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remotename = fromJust (lookupName c)
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go Nothing = giveup "Specify gitrepo="
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go (Just gitrepo) = do
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(c', _encsetup) <- encryptionSetup c gc
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let url = Git.GCrypt.urlPrefix ++ gitrepo
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rs <- Annex.getGitRemotes
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case filter (\r -> Git.remoteName r == Just remotename) rs of
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[] -> inRepo $ Git.Command.run
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[ Param "remote", Param "add"
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, Param remotename
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, Param url
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]
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(r:_)
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| Git.repoLocation r == url -> noop
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| otherwise -> error "Another remote with the same name already exists."
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pc <- either giveup return . parseRemoteConfig c'
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=<< configParser remote
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setGcryptEncryption pc remotename
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{- Run a git fetch and a push to the git repo in order to get
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- its gcrypt-id set up, so that later git annex commands
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- will use the remote as a gcrypt remote. The fetch is
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- needed if the repo already exists; the push is needed
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- if the repo has not yet been initialized by gcrypt. -}
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void $ inRepo $ Git.Command.runBool
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[ Param "fetch"
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, Param remotename
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]
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void $ inRepo $ Git.Command.runBool
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[ Param "push"
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, Param remotename
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, Param $ Git.fromRef Annex.Branch.fullname
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]
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g <- inRepo Git.Config.reRead
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case Git.GCrypt.remoteRepoId g (Just remotename) of
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Nothing -> giveup "unable to determine gcrypt-id of remote"
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Just gcryptid -> do
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let u = genUUIDInNameSpace gCryptNameSpace gcryptid
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if Just u == mu || isNothing mu
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then do
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method <- setupRepo gcryptid =<< inRepo (Git.Construct.fromRemoteLocation gitrepo)
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gitConfigSpecialRemote u c' [("gcrypt", fromAccessMethod method)]
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return (c', u)
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else giveup $ "uuid mismatch; expected " ++ show mu ++ " but remote gitrepo has " ++ show u ++ " (" ++ show gcryptid ++ ")"
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{- Sets up the gcrypt repository. The repository is either a local
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- repo, or it is accessed via rsync directly, or it is accessed over ssh
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- and git-annex-shell is available to manage it.
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-
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- The GCryptID is recorded in the repository's git config for later use.
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- Also, if the git config has receive.denyNonFastForwards set, disable
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- it; gcrypt relies on being able to fast-forward branches.
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-}
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setupRepo :: Git.GCrypt.GCryptId -> Git.Repo -> Annex AccessMethod
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setupRepo gcryptid r
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| Git.repoIsUrl r = do
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dummycfg <- liftIO dummyRemoteGitConfig
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(_, _, accessmethod) <- rsyncTransport r dummycfg
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case accessmethod of
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AccessDirect -> rsyncsetup
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AccessShell -> ifM gitannexshellsetup
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( return AccessShell
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, rsyncsetup
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)
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| Git.repoIsLocalUnknown r = localsetup =<< liftIO (Git.Config.read r)
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| otherwise = localsetup r
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where
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localsetup r' = do
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let setconfig k v = liftIO $ Git.Command.run [Param "config", Param (fromConfigKey k), Param v] r'
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setconfig coreGCryptId gcryptid
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setconfig denyNonFastForwards (Git.Config.boolConfig False)
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return AccessDirect
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{- As well as modifying the remote's git config,
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- create the objectDir on the remote,
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- which is needed for direct rsync of objects to work.
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-}
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rsyncsetup = Remote.Rsync.withRsyncScratchDir $ \tmp -> do
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liftIO $ createDirectoryIfMissing True $ tmp </> objectDir
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dummycfg <- liftIO dummyRemoteGitConfig
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(rsynctransport, rsyncurl, _) <- rsyncTransport r dummycfg
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let tmpconfig = tmp </> "config"
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opts <- rsynctransport
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void $ liftIO $ rsync $ opts ++
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[ Param $ rsyncurl ++ "/config"
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, Param tmpconfig
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]
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liftIO $ do
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void $ Git.Config.changeFile tmpconfig coreGCryptId (encodeBS' gcryptid)
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void $ Git.Config.changeFile tmpconfig denyNonFastForwards (Git.Config.boolConfig' False)
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ok <- liftIO $ rsync $ opts ++
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[ Param "--recursive"
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, Param $ tmp ++ "/"
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, Param rsyncurl
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]
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unless ok $
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giveup "Failed to connect to remote to set it up."
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return AccessDirect
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{- Ask git-annex-shell to configure the repository as a gcrypt
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- repository. May fail if it is too old. -}
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gitannexshellsetup = Ssh.onRemote NoConsumeStdin r
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(\f p -> liftIO (boolSystem f p), return False)
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"gcryptsetup" [ Param gcryptid ] []
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denyNonFastForwards = ConfigKey "receive.denyNonFastForwards"
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accessShell :: Remote -> Bool
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accessShell = accessShellConfig . gitconfig
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accessShellConfig :: RemoteGitConfig -> Bool
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accessShellConfig c = case method of
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AccessShell -> True
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_ -> False
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where
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method = toAccessMethod $ fromMaybe "" $ remoteAnnexGCrypt c
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shellOrRsync :: Remote -> Annex a -> Annex a -> Annex a
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shellOrRsync r ashell arsync
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| accessShell r = ashell
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| otherwise = arsync
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{- Configure gcrypt to use the same list of keyids that
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- were passed to initremote as its participants.
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- Also, configure it to use a signing key that is in the list of
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- participants, which gcrypt requires is the case, and may not be
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- depending on system configuration.
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-
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- (For shared encryption, gcrypt's default behavior is used.)
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-
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- Also, sets gcrypt-publish-participants to avoid unncessary gpg
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- passphrase prompts.
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-}
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setGcryptEncryption :: ParsedRemoteConfig -> String -> Annex ()
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setGcryptEncryption c remotename = do
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let participants = remoteconfig Git.GCrypt.remoteParticipantConfigKey
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case extractCipher c of
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Nothing -> noCrypto
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Just cip -> case cipherKeyIds cip of
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Nothing -> noop
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Just (KeyIds { keyIds = ks}) -> do
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setConfig participants (unwords ks)
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let signingkey = Git.GCrypt.remoteSigningKey remotename
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cmd <- gpgCmd <$> Annex.getGitConfig
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skeys <- M.keys <$> liftIO (secretKeys cmd)
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case filter (`elem` ks) skeys of
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[] -> noop
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(k:_) -> setConfig signingkey k
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setConfig (remoteconfig Git.GCrypt.remotePublishParticipantConfigKey)
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(Git.Config.boolConfig True)
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where
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remoteconfig n = n remotename
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store :: Remote -> Remote.Rsync.RsyncOpts -> Storer
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store r rsyncopts k s p = do
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repo <- getRepo r
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store' repo r rsyncopts k s p
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store' :: Git.Repo -> Remote -> Remote.Rsync.RsyncOpts -> Storer
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store' repo r rsyncopts
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| not $ Git.repoIsUrl repo =
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byteStorer $ \k b p -> guardUsable repo (return False) $ liftIO $ do
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let tmpdir = Git.repoLocation repo </> "tmp" </> fromRawFilePath (keyFile k)
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void $ tryIO $ createDirectoryIfMissing True tmpdir
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let tmpf = tmpdir </> fromRawFilePath (keyFile k)
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meteredWriteFile p tmpf b
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let destdir = parentDir $ gCryptLocation repo k
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Remote.Directory.finalizeStoreGeneric tmpdir destdir
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return True
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| Git.repoIsSsh repo = if accessShell r
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then fileStorer $ \k f p -> do
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oh <- mkOutputHandler
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Ssh.rsyncHelper oh (Just p)
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=<< Ssh.rsyncParamsRemote False r Upload k f
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(AssociatedFile Nothing)
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else fileStorer $ Remote.Rsync.store rsyncopts
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| otherwise = unsupportedUrl
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retrieve :: Remote -> Remote.Rsync.RsyncOpts -> Retriever
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retrieve r rsyncopts k p sink = do
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repo <- getRepo r
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retrieve' repo r rsyncopts k p sink
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retrieve' :: Git.Repo -> Remote -> Remote.Rsync.RsyncOpts -> Retriever
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retrieve' repo r rsyncopts
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| not $ Git.repoIsUrl repo = byteRetriever $ \k sink ->
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guardUsable repo (return False) $
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sink =<< liftIO (L.readFile $ gCryptLocation repo k)
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| Git.repoIsSsh repo = if accessShell r
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then fileRetriever $ \f k p -> do
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ps <- Ssh.rsyncParamsRemote False r Download k f
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(AssociatedFile Nothing)
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oh <- mkOutputHandler
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unlessM (Ssh.rsyncHelper oh (Just p) ps) $
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giveup "rsync failed"
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else fileRetriever $ Remote.Rsync.retrieve rsyncopts
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| otherwise = unsupportedUrl
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where
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remove :: Remote -> Remote.Rsync.RsyncOpts -> Remover
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remove r rsyncopts k = do
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repo <- getRepo r
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remove' repo r rsyncopts k
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remove' :: Git.Repo -> Remote -> Remote.Rsync.RsyncOpts -> Remover
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remove' repo r rsyncopts k
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| not $ Git.repoIsUrl repo = guardUsable repo (return False) $
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liftIO $ Remote.Directory.removeDirGeneric (Git.repoLocation repo) (parentDir (gCryptLocation repo k))
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| Git.repoIsSsh repo = shellOrRsync r removeshell removersync
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| otherwise = unsupportedUrl
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where
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removersync = Remote.Rsync.remove rsyncopts k
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removeshell = Ssh.dropKey repo k
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checkKey :: Remote -> Remote.Rsync.RsyncOpts -> CheckPresent
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checkKey r rsyncopts k = do
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repo <- getRepo r
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checkKey' repo r rsyncopts k
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checkKey' :: Git.Repo -> Remote -> Remote.Rsync.RsyncOpts -> CheckPresent
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checkKey' repo r rsyncopts k
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| not $ Git.repoIsUrl repo =
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guardUsable repo (cantCheck repo) $
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liftIO $ doesFileExist (gCryptLocation repo k)
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| Git.repoIsSsh repo = shellOrRsync r checkshell checkrsync
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| otherwise = unsupportedUrl
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where
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checkrsync = Remote.Rsync.checkKey repo rsyncopts k
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checkshell = Ssh.inAnnex repo k
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{- Annexed objects are hashed using lower-case directories for max
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- portability. -}
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gCryptLocation :: Git.Repo -> Key -> FilePath
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gCryptLocation repo key = Git.repoLocation repo </> objectDir
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</> fromRawFilePath (keyPath key (hashDirLower def))
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|
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data AccessMethod = AccessDirect | AccessShell
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|
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fromAccessMethod :: AccessMethod -> String
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fromAccessMethod AccessShell = "shell"
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fromAccessMethod AccessDirect = "true"
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toAccessMethod :: String -> AccessMethod
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toAccessMethod "shell" = AccessShell
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toAccessMethod _ = AccessDirect
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getGCryptUUID :: Bool -> Git.Repo -> Annex (Maybe UUID)
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getGCryptUUID fast r = do
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dummycfg <- liftIO dummyRemoteGitConfig
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(genUUIDInNameSpace gCryptNameSpace <$>) . fst
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<$> getGCryptId fast r dummycfg
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|
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coreGCryptId :: ConfigKey
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coreGCryptId = "core.gcrypt-id"
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|
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{- gcrypt repos set up by git-annex as special remotes have a
|
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- core.gcrypt-id setting in their config, which can be mapped back to
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- the remote's UUID.
|
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-
|
||
- In fast mode, only checks local repos. To check a remote repo,
|
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- tries git-annex-shell and direct rsync of the git config file.
|
||
-
|
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- (Also returns a version of input repo with its config read.) -}
|
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getGCryptId :: Bool -> Git.Repo -> RemoteGitConfig -> Annex (Maybe Git.GCrypt.GCryptId, Git.Repo)
|
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getGCryptId fast r gc
|
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| Git.repoIsLocal r || Git.repoIsLocalUnknown r = extract <$>
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liftIO (catchMaybeIO $ Git.Config.read r)
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| not fast = extract . liftM fst <$> getM (eitherToMaybe <$>)
|
||
[ Ssh.onRemote NoConsumeStdin r (\f p -> liftIO (Git.Config.fromPipe r f p), return (Left $ error "configlist failed")) "configlist" [] []
|
||
, getConfigViaRsync r gc
|
||
]
|
||
| otherwise = return (Nothing, r)
|
||
where
|
||
extract Nothing = (Nothing, r)
|
||
extract (Just r') = (fromConfigValue <$> Git.Config.getMaybe coreGCryptId r', r')
|
||
|
||
getConfigViaRsync :: Git.Repo -> RemoteGitConfig -> Annex (Either SomeException (Git.Repo, S.ByteString))
|
||
getConfigViaRsync r gc = do
|
||
(rsynctransport, rsyncurl, _) <- rsyncTransport r gc
|
||
opts <- rsynctransport
|
||
liftIO $ do
|
||
withTmpFile "tmpconfig" $ \tmpconfig _ -> do
|
||
void $ rsync $ opts ++
|
||
[ Param $ rsyncurl ++ "/config"
|
||
, Param tmpconfig
|
||
]
|
||
Git.Config.fromFile r tmpconfig
|