summaryrefslogtreecommitdiff
path: root/lib/Kiki.hs
blob: ca6e80f2d0c27d140eb1e3f0d894853c02041cbf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
{-# LANGUAGE CPP               #-}
{-# LANGUAGE OverloadedStrings #-}
module Kiki
    ( module Kiki
    , setVerifyFlag
    ) where

import           Control.Applicative
import           Control.Exception
import           Control.Monad
import           Data.ASN1.BinaryEncoding
import           Data.ASN1.Encoding
import           Data.ASN1.Types
import           Data.Binary
import           Data.Bool
import           Data.Char
import           Data.Functor
import           Data.List
import           Data.Maybe
import           Data.OpenPGP
import           Data.OpenPGP.Util
import           Data.Ord
import qualified Data.Traversable           as T (mapM)
import           System.Directory
import           System.FilePath.Posix      as FilePath
import           System.IO
import           System.IO.Error
import           System.IO.Temp
import           System.Posix.Files
import           System.Posix.Types         (FileMode)
import           System.Posix.IO            as Posix (createPipe)
import           System.Posix.User
#if defined(VERSION_memory)
import           Data.ByteArray.Encoding
import qualified Data.ByteString.Char8      as S8
#elif defined(VERSION_dataenc)
import qualified Codec.Binary.Base64        as Base64
#endif
import qualified Data.ByteString.Lazy       as L
import qualified Data.ByteString.Lazy.Char8 as Char8
import qualified Data.Map.Strict            as Map
import           Network.Socket
import           ProcessUtils
import qualified SSHKey                     as SSH

import           CommandLine
import           DotLock
import           GnuPGAgent                 (Query (..))
import           KeyRing hiding (pemFromPacket)

withAgent :: [PassphraseSpec] -> [PassphraseSpec]
withAgent [] = [PassphraseAgent]
withAgent ps = ps

ciphername :: SymmetricAlgorithm -> String
ciphername Unencrypted = "-"
ciphername TripleDES   = "3des"
ciphername (SymmetricAlgorithm w8) = "cipher-"++show w8
ciphername c = map toLower $ show c

cipherFromString :: String -> SymmetricAlgorithm
cipherFromString "clear"       = Unencrypted
cipherFromString "unencrypted" = Unencrypted
cipherFromString s             =
    case filter ( (== s) . ciphername) ciphers of
        x:_                  -> x
        -- _ | all isHexDigit s -> unhex s
        _                    -> error $ "known ciphers: "++unwords (map ciphername ciphers)
 {-
 where
#if defined(VERSION_memory)
    unhex hx = case convertFromBase Base16 (S8.pack hx) of
                Left e -> do
                    -- Useful for debugging but insecure generally ;)
                    -- putStrLn $ "convertFromBase error for input "++show hx++": "++show e
                    return Nothing
                Right bs -> return $ Just $ S8.unpack bs
#elif defined(VERSION_dataenc)
    unhex hx = maybe (return () {- putStrLn $ "dataenc error for input "++show hx -})
                     return
                     $ fmap (map $ chr . fromIntegral) $ Base16.decode hx
#endif
-}


ciphers :: [SymmetricAlgorithm]
ciphers = takeWhile notFallback $ map toEnum $ [0..4]++[7..]
 where
    notFallback (SymmetricAlgorithm _) = False
    notFallback _                      = True

-- |
-- Regenerate /var/cache/kiki
refresh :: (FilePath -> FilePath) -> CommonArgsParsed -> IO ()
refresh root homepass = do
    let homepass' = homepass { cap_homespec = fmap root (cap_homespec homepass) }
    KikiResult r report <- runKeyRing $ minimalOp homepass'
    let mroot = case root "" of
                    "/" -> Nothing
                    ""  -> Nothing
                    pth -> Just pth
    case r of
        KikiSuccess rt -> refreshCache rt mroot
        _              -> return () -- XXX: silent fail?

data CommonArgsParsed = CommonArgsParsed { cap_homespec :: Maybe String, cap_passfd :: Maybe InputFile }

streaminfo :: StreamInfo
streaminfo = StreamInfo
    { fill = KF_None
    , spill = KF_None
    , typ = KeyRingFile
    , initializer = NoCreate
    , access = AutoAccess
    , transforms = []
    }

minimalOp :: CommonArgsParsed -> KeyRingOperation
minimalOp cap = op
 where
    streaminfo = StreamInfo { fill = KF_None
                            , typ = KeyRingFile
                            , spill = KF_All
                            , initializer = NoCreate
                            , access = AutoAccess
                            , transforms = []
                            }
    op = KeyRingOperation
        { opFiles = Map.fromList $
            [ ( HomeSec, streaminfo { access = Sec })
            , ( HomePub, streaminfo { access = Pub })
            ]
        , opPassphrases = withAgent $ do pfile <- maybeToList (cap_passfd cap)
                                         return $ PassphraseSpec Nothing Nothing pfile
        , opTransforms = []
        , opHome = cap_homespec cap
        }

run :: [String] -> Args (IO ()) -> IO ()
run args x =
    case runArgs (parseInvocation (uncurry fancy kikiOptions "") args) x of
        Left e   -> hPutStrLn stderr $ usageErrorMessage e
        Right io -> io

outputReport :: [(FilePath, KikiReportAction)] -> IO ()
outputReport report = do
    forM_ report $ \(fname,act) -> do
        putStrLn $ fname ++ ": " ++ reportString act

spawn :: CommonArgsParsed -> SymmetricAlgorithm -> FilePath -> IO ()
spawn cmn cipher path = do
    putStrLn "TODO: implement keygen.sh replacement.sh"

mkdirFor :: FilePath -> IO ()
mkdirFor path = do
    let dir = takeDirectory path
    createDirectoryIfMissing True dir


-- | Useful default KeyRingFile StreamInfo.
strm :: StreamInfo
strm = StreamInfo
              { typ         = KeyRingFile
              , fill        = KF_None
              , spill       = KF_All
              , access      = AutoAccess
              , initializer = NoCreate
              , transforms  = []
              }

-- | Convenience constructor for StreamInfo
buildStreamInfo :: KeyFilter -> FileType -> StreamInfo
buildStreamInfo rtyp ftyp = strm { typ = ftyp , fill = rtyp }

-- | Convenience constuctor for Streaminfo generating a tagged subkey.
peminfo :: Int       -- ^ bits
           -> String -- ^ subkey tag.
           -> StreamInfo
peminfo bits usage = StreamInfo
              { typ         = PEMFile
              , fill        = KF_None -- KF_Match usage
              , spill       = KF_Match usage
              , access      = Sec
              , initializer = Internal (GenRSA $ bits `div` 8)
              , transforms  = []
              }

importAndRefresh :: (FilePath -> FilePath) -> CommonArgsParsed -> SymmetricAlgorithm -> IO ()
importAndRefresh root cmn cipher = do
  let rootdir = do guard (root "x" /= "x")
                   Just $ root ""
  me <- getEffectiveUserID
  let noChrootArg = rootdir == Nothing
      bUnprivileged = (me/=0) && noChrootArg
  bool id (error "--chroot requires an argument") (rootdir==Just "") $ do
    let homespec = mplus (slash <$> rootdir <*> cap_homespec cmn)
                         (fmap (++"/root/.gnupg") rootdir)
        passfd = cap_passfd cmn
    (home,secring,pubring,mbwk) <- unconditionally $ getHomeDir homespec
    osHomeDir <- if bUnprivileged then getHomeDirectory else return "/root"

    old_umask <- setFileCreationMask 0o077 -- Keyring files need to be created with proper mask.
    gotsec <- doesFileExist secring
    (torgen,pwds) <- bool id (const $ return (Generate 0 $ GenRSA $ 1024 `div` 8, [])) gotsec $ do
        -- We have no secring.gpg (and thus no master key).
        -- Since 'runKeyRing' cannot currently cope with this situation, we will
        -- generate a master-key and very minimal secring.gpg file.
        master_un <- generateKey (GenRSA $ 4096 `div` 8 )
            <&> \k -> MappedPacket (k { is_subkey = False }) -- Set as master-key.
                                   Map.empty                 -- Packet occurs in no files.
        -- The user may desire the master key is encrypted on disk but this
        -- requires a password prompt.  In order to have a decent prompt, it'd
        -- be nice if we could display the .onion hostname for the key.
        -- Therefore, we generate the tor key early.
        tor_un <- generateKey (GenRSA $ 1024 `div` 8 )
        -- However, we'll postpone writing the tor key to the keyring and
        -- instead have the later all-in-one call to runKeyRing take care of
        -- it.  That interface does not currently provide a way to accept
        -- in-memory input, so we'll create a fifo stream for it to read the
        -- key in PEM format.
        (read_tor,write_tor) <- Posix.createPipe
        rs <- writeKeyToFile (streaminfo { typ    = PEMFile
                                         , access = Sec
                                         , spill  = KF_Match "tor"
                                         , fill   = KF_All })
                             (FileDesc write_tor)
                             tor_un
        -- -- Currently disabled: show warnings and errors from the PEM generation.
        -- outputReport $ map (first show) rs

        let ctx = InputFileContext secring pubring
        -- Here we encrypt the master-key if neccessary.  If no --passphrase-fd option
        -- was used, the user will receive prompts from gpg-agent.
        (master0,transcoder) <- do
            let main_passwds = withAgent $ do pfd <- maybeToList passfd
                                              return $ PassphraseSpec Nothing Nothing pfd
                uidentry = Map.singleton (keykey $ packet master_un)
                            $ master_un { packet = Query (packet master_un)
                                                         (torUIDFromKey tor_un)
                                                         Nothing }
            cipher's2k <- do
                IteratedSaltedS2K _ salt _ <- randomS2K SHA1
                return $ (cipher {- AES128 -}, IteratedSaltedS2K SHA1 salt (15 * 2^19))
            transcoder <- makeMemoizingDecrypter main_passwds ctx (Just master_un, uidentry)
            master <- transcoder cipher's2k master_un
            return (master,transcoder)

        -- Finally, we write-out the secring.gpg file.
        case master0 of
            KikiSuccess master -> do
                mkdirFor secring
                writeInputFileL ctx
                                HomeSec
                                $ encode $ Message [master]
                putStrLn "Wrote master key"
                return (FileDesc read_tor, [PassphraseMemoizer transcoder])
            er -> do
                hPutStrLn stderr ("warning: " ++ errorString er)
                hPutStrLn stderr "warning: keys will not be encrypted.";
                mkdirFor secring
                writeInputFileL ctx
                                HomeSec
                                $ encode $ Message [packet master_un]
                putStrLn "Wrote master key"
                return (FileDesc read_tor, [])

    -- If the public ring does not exist, then creating an empty file is
    -- sufficient to satisfy 'runKeyRing'.  However, as we've already generated
    -- a key above, GnuPG will not like the unsynced state we are leaving these
    -- files.  It's important at this point that, 'runKeyRing' actually occurs
    -- to fix things up.
    gotpub <- doesFileExist pubring
    when (not gotpub) $ do
        mkdirFor pubring
        writeInputFileL (InputFileContext secring pubring)
                        HomePub
                        ( encode $ Message [] )

    setFileCreationMask old_umask -- We're done creating keyring files, so restore umask.

    let sshcpath = fromMaybe "" rootdir ++ osHomeDir ++ ".ssh/id_rsa"
        sshspath = fromMaybe "" rootdir ++ "/etc/ssh/ssh_host_rsa_key"
        op =
          KeyRingOperation
          { opFiles =
              Map.fromList $
                [ ( HomeSec, buildStreamInfo KF_All KeyRingFile )
                , ( HomePub, (buildStreamInfo KF_All KeyRingFile) { access = Pub } )
                , ( torgen , case torgen of
                                FileDesc _ -> StreamInfo { typ = PEMFile
                                                         , fill = KF_Match "tor"
                                                         , spill = KF_Match "tor"
                                                         , access = Sec
                                                         , initializer = NoCreate
                                                         , transforms = [] }
                                _          -> strm { spill = KF_Match "tor" })
                , ( Generate 1 (GenRSA (2048 `div` 8)), strm { spill = KF_Match "ipsec" })
                , ( ArgFile sshcpath, (peminfo 2048 "ssh-client") )
                , ( ArgFile sshspath, (peminfo 2048 "ssh-server") )
                , ( Generate 2 (GenRSA (4096 `div` 8)), strm { spill = KF_Match "encrypt" })
                , ( Generate 3 (GenRSA (4096 `div` 8)), strm { spill = KF_Match "sign" })
                ]
          , opPassphrases = withAgent $ pwds ++ do pfd <- maybeToList passfd
                                                   return $ PassphraseSpec Nothing Nothing pfd
          , opHome = homespec
          , opTransforms = []
          }
        nop =
          KeyRingOperation
          { opFiles = Map.fromList -- It's too late for a true no-op,
                                   -- so we'll sync the keyrings at least.
                [ ( HomeSec, buildStreamInfo KF_All KeyRingFile )
                , ( HomePub, (buildStreamInfo KF_All KeyRingFile) { access = Pub } )
                ]
          , opPassphrases = withAgent $ do pfd <- maybeToList passfd
                                           return $ PassphraseSpec Nothing Nothing pfd
          , opHome=homespec, opTransforms = []
          }
    -- Run the all-in-one operation that generates or imports all subkeys.
    KikiResult rt report <- runKeyRing (if bUnprivileged then nop else op)
    outputReport report
    rt <- case rt of
        BadPassphrase ->
            error "Operation requires correct passphrase. (Hint: Use --passphrase-fd=0 to input it on stdin.)"
        _ -> unconditionally $ return rt
    -- Finally, we update /var/cache/kiki.
    when (not bUnprivileged) $ refreshCache rt rootdir

-- Installs the cert file for the peer to the filesystem, and returns an
-- ipsec.conf snippet configuring the peer and referencing the installed cert
-- file.
installIpsecPeerCertificate
  :: (FilePath -> FilePath)
  -> (L.ByteString, SockAddr, KeyData)
  -> IO Char8.ByteString
installIpsecPeerCertificate mkpath (contactname,addr,kd) =
    Char8.concat <$> do
            forM (take 1 ipsecs) $ \k -> do
                flip (either warn') (pemFromPacket k :: Either String String) $ \pem -> do
                    case sshs of
                        (sshkey:_) -> do
                          theirHostname <- sshKeyToHostname sshkey
                          write (mkpath $ ipsecCertPath theirHostname) pem
                          return $ strongswanPeerConfiguration addr contactname theirHostname
                        _ -> error "fuck."
  where
    warn' x = warn x >> return Char8.empty

    their_master = packet $ keyMappedPacket kd :: Packet

    -- We find all cross-certified ipsec keys for the given cross-certified onion name.
    ipsecs :: [Packet]
    ipsecs = sortOn (Down . timestamp)
             $ getSubkeys CrossSigned their_master (keySubKeys kd) "ipsec"
               -- ++ getSubkeys CrossSigned their_master (keySubKeys kd) "strongswan"

    sshs :: [Packet]
    sshs = sortOn (Down . timestamp)
             $ getSubkeys CrossSigned their_master (keySubKeys kd) "ssh-server"

ipsecPath :: String -> Char8.ByteString -> String
ipsecPath theDirName theBaseName = "ipsec.d/" ++ theDirName ++ "/" ++ Char8.unpack theBaseName ++ ".pem"

ipsecKeyPath :: Char8.ByteString -> FilePath
ipsecKeyPath = ipsecPath "private"

ipsecCertPath :: Char8.ByteString -> FilePath
ipsecCertPath = ipsecPath "certs"

write' :: (FilePath -> t -> IO b) -> FilePath -> t -> IO b
write' wr f bs = do
            createDirectoryIfMissing True $ takeDirectory f
            wr f bs

write :: FilePath -> String -> IO ()
write = write' writeFile

writeL :: FilePath -> Char8.ByteString -> IO ()
writeL = write' L.writeFile

writeL077 :: FilePath -> Char8.ByteString -> IO FileMode
writeL077 f bs = do
            old_umask <- setFileCreationMask 0o077
            writeL f bs
            setFileCreationMask old_umask

getMkPathAndCommit :: FilePath -> IO (FilePath -> FilePath, IO ())
getMkPathAndCommit destdir = do
            let cachedir = takeDirectory destdir
                unslash ('/':xs) = xs
                unslash xs = xs
                timeout = -1 -- TODO: set milisecond timeout on dotlock
            createDirectoryIfMissing True cachedir
            tmpdir <- createTempDirectory cachedir (takeBaseName destdir ++ ".")
            createSymbolicLink (makeRelative cachedir tmpdir) (tmpdir ++ ".link")
            lock <- dotlock_create destdir 0
            T.mapM (flip dotlock_take timeout) lock
            let mkpath pth = tmpdir </> unslash (makeRelative destdir pth)
                commit     = do
                    oldcommit <- (Just <$> readSymbolicLink destdir)
                                    `catch` \e -> do
                                        when (not $ isDoesNotExistError e) $ warn (show e)
                                        return Nothing
                    -- Note: Files not written to are considered deleted,
                    --       otherwise call readyReadBeforeWrite on them.
                    rename (tmpdir ++ ".link") destdir
                    er <- T.mapM dotlock_release lock
                    void $ T.mapM removeDirectoryRecursive (FilePath.combine cachedir <$> oldcommit)
            -- Present transaction is Write only (or Write-Before-Read) which is fine.
            -- If ever Read-Before-Write is required, uncomment and use:
            -- let readyReadBeforeWrite pth = do
            --    let copyIt = do
            --          createDirectoryIfMissing True (takeDirectory (mkpath pth))
            --          copyFile (destdir </> unslash (makeRelative destdir pth) (mkpath pth)
            --    doesFileExist (mkpath pth) >>= flip when copyIt
            --    return (mkpath pth)
            return (mkpath, commit {-, readyReadBeforeWrite -})

generateHostsFile :: (FilePath -> FilePath) -> KeyRingRuntime -> IO ()
generateHostsFile mkpath rt = do
    let hostspath = mkpath "hosts"
        op = KeyRingOperation
             { opFiles = Map.fromList $
                [ ( HomePub, streaminfo { typ=KeyRingFile, spill=KF_All, access=Pub } )
                , ( ArgFile hostspath, streaminfo { typ=Hosts, spill=KF_None, fill=KF_All, access=Pub } )
                ]
             , opPassphrases = []
             , opHome = Just $ takeDirectory (rtPubring rt)
             , opTransforms = []
             }
    KikiResult _ report <- runKeyRing op
    outputReport report

names :: KeyRingRuntime -> Maybe (SockAddr, ([Char8.ByteString], [Char8.ByteString]))
names rt = do wk <- rtWorkingKey rt
              -- XXX unnecessary signature check
              return $ getHostnames (rtKeyDB rt Map.! keykey wk)

getssh :: (Char8.ByteString, SockAddr, KeyData) -> Char8.ByteString
getssh (contactname,_addr,kd) = do
            let their_master = packet $ keyMappedPacket kd
                sshs :: [Packet]
                sshs = sortOn (Down . timestamp)
                         $ getSubkeys CrossSigned their_master (keySubKeys kd) "ssh-server"
                blobs = mapMaybe sshblobFromPacketL sshs
                taggedblobs = map (\b -> contactname <> " " <> b) blobs
            Char8.unlines taggedblobs


installIpsecConf :: (FilePath -> FilePath) -> SockAddr -> Char8.ByteString -> [(Char8.ByteString, SockAddr, KeyData)] -> IO ()
installIpsecConf mkpath wkaddr (certBasename) cs = do
    snippets <- mapM (installIpsecPeerCertificate mkpath) cs
    writeL (mkpath "ipsec.conf") . Char8.unlines
          $ [ "conn %default"
            , "  ikelifetime=60m"
            , "  keylife=20m"
            , "  rekeymargin=3m"
            , "  keyingtries=%forever"
            , "  keyexchange=ikev2"
            , "  dpddelay=10s"
            , "  dpdaction=restart"
            , "  left=%defaultroute"
            , "  leftsubnet=" <> Char8.pack (showA wkaddr) <> "/128"
            , "  leftauth=pubkey"
            , "  leftid=" <> Char8.pack (showA wkaddr)
            , "  leftrsasigkey=" <> certBasename
            , "  leftikeport=4500"
            , "  rightikeport=4500"
            , "  right=%any"
            , "  rightauth=pubkey"
            , "  type=tunnel"
            , "  auto=route"
            , ""
            ] ++ filter (not . Char8.null) snippets

refreshCache :: KeyRingRuntime -> Maybe FilePath -> IO ()
refreshCache rt rootdir = do
    (mkpath, commit) <- getMkPathAndCommit (fromMaybe "" rootdir ++ "/var/cache/kiki/config")
    generateHostsFile mkpath rt
    fromMaybe (error "No working key.") $ do
    (wkaddr,(onames,_)) <- names rt
    Just $ do
    let oname = Char8.concat $ take 1 onames
        bUnprivileged = False -- TODO
    if (oname == "") && (not bUnprivileged) then error "Missing tor key" else do
    -- sshcpathpub0 = fromMaybe "" rootdir ++ osHomeDir </> ".ssh" </> "id_rsa.pub"
    -- sshspathpub0 = fromMaybe "" rootdir ++ "/etc/ssh/ssh_host_rsa_key.pub"
    -- contactipsec0 = fromMaybe "" rootdir ++ "/etc/ipsec.d/certs/%(onion).pem"

    flip (maybe $ warn "missing working key?") (rtWorkingKey rt) $ \wk -> do

    let grip = fingerprint wk
        exportOp = passphrases <> pemSecrets <> minimalOp (CommonArgsParsed (Just $ takeDirectory $ rtPubring rt) Nothing)
         where
          passphrases = mempty { opPassphrases = [PassphraseMemoizer (rtPassphrases rt)] }
          pemSecrets = mempty { opFiles = Map.fromList
            [ send "ipsec"      (mkpath $ ipsecKeyPath oname)                             "missing ipsec key?"
            , send "ssh-client" (mkpath "root/.ssh/id_rsa")                               "missing ssh-client key?"
            , send "ssh-server" (mkpath "ssh_host_rsa_key")                               "missing ssh host key?"
            , send "tor"        (mkpath "tor/private_key")                                "missing tor key?"
            ]
          }
          send usage path warning =
            ( ArgFile path, StreamInfo { typ = PEMFile
                                       , fill = KF_Match usage
                                       , spill = KF_None
                                       , access = Sec
                                       , initializer = WarnMissing warning
                                       , transforms = []
                                       })
    KikiResult rt' report <- runKeyRing exportOp
    outputReport report
    -- outputReport $ map (first $ resolveForReport ctx) $ filter ((/=ExportedSubkey) . snd) report
    rt'' <- rethrowKikiErrors rt'
    writePublicKeyFiles rt'' mkpath grip oname wkaddr commit

rethrowKikiErrors :: KikiCondition a -> IO a
rethrowKikiErrors BadPassphrase =
  error "Operation requires correct passphrase. (Hint: Use --passphrase-fd=0 to input it on stdin.)"
rethrowKikiErrors rt = unconditionally $ return rt

writePublicKeyFiles :: KeyRingRuntime -> (FilePath -> FilePath) -> String -> Char8.ByteString -> SockAddr -> IO () -> IO ()
writePublicKeyFiles rt mkpath grip oname wkaddr commit = do

    -- Finally, export public keys if they do not exist.
    either warn (write $ mkpath "root/.ssh/id_rsa.pub") $ show_ssh' "ssh-client" grip (rtKeyDB rt)
    either warn (write $ mkpath "ssh_host_rsa_key.pub") $ show_ssh' "ssh-server" grip (rtKeyDB rt)
    either warn (write $ mkpath $ ipsecCertPath oname) $ show_pem' "ipsec" grip (rtKeyDB rt) pemFromPacket

    let onionkeys = mapMaybe namedContact $ Map.elems $ rtKeyDB rt
        cs = filter (\(_,_,kd) -> notme kd) onionkeys
        kk = keykey (fromJust $ rtWorkingKey rt)
        notme kd = keykey (keyPacket kd) /= kk

        namedContact kd = do
            -- The getHostnames command requires a valid cross-signed tor key
            -- for each onion name returned in (_,(ns,_)).
            let (addr,(ns,_)) = getHostnames kd
            fmap (\n -> (n,addr, kd)) $ listToMaybe ns -- only first onion name.

        known_hosts = L.concat $ map getssh onionkeys

    writeL (mkpath "ssh_known_hosts") known_hosts

    installIpsecConf mkpath wkaddr (Char8.pack $ takeBaseName $ ipsecCertPath oname) cs
    commit

sshKeyToHostname :: Packet -> IO Char8.ByteString
sshKeyToHostname sshkey = do
  (_, (sout, _serr)) <- runExternal shellScript (Just $ sshblobFromPacket sshkey)
  return $ Char8.fromChunks [sout]
  where
    shellScript =
      "f=$(mktemp) && cat > \"$f\" && ssh-keygen -r _ -f \"$f\"  |" ++
      " (read _ _ _ _ _ hash _ && echo -n $hash.ssh.cryptonomic.net); r=$?; rm -f \"$f\"; exit $r"

strongswanPeerConfiguration :: SockAddr -> Char8.ByteString -> Char8.ByteString -> Char8.ByteString
strongswanPeerConfiguration addr oname rightip = Char8.unlines
    [ "conn " <> oname
    , "  right=" <> rightip
    , "  rightsubnet=" <> p (showA addr) <> "/128"
    , "  rightauth=pubkey"
    , "  rightid=" <> p (showA addr)
    , "  rightrsasigkey=" <> oname <> ".pem"
    ]
    where p = Char8.pack

-- conn hiotuxliwisbp6mi.onion
--   right=%hiotuxliwisbp6mi.onion.ipv4
--   rightsubnet=fdcc:76c8:cb34:74e6:2aa3:cb39:abc8:d403/128
--   rightauth=pubkey
--   rightid=fdcc:76c8:cb34:74e6:2aa3:cb39:abc8:d403
--   rightrsasigkey=hiotuxliwisbp6mi.onion.pem

showA :: SockAddr -> String
showA addr = if null bracket then pre else drop 1 pre
    where (pre,bracket) = break (==']') (show addr)


#if !MIN_VERSION_base(4,8,0)
sortOn :: Ord b => (a -> b) -> [a] -> [a]
sortOn f =
    map snd . sortBy (comparing fst) . map (\x -> let y = f x in y `seq` (y, x))
#endif

pemFromPacket :: Monad m => Packet -> m String
pemFromPacket k = do
    let rsa = pkcs8 . fromJust $ rsaKeyFromPacket k
        der = encodeASN1 DER (toASN1 rsa [])
#if defined(VERSION_memory)
        qq  = S8.unpack $ convertToBase Base64 (L.toStrict der)
#elif defined(VERSION_dataenc)
        qq  = Base64.encode (L.unpack der)
#endif
    return $
        writePEM PemPublicKey qq -- ("TODO "++show keyspec)

show_pem :: String -> String -> KeyDB -> IO ()
show_pem keyspec wkgrip db = either warn putStrLn $ show_pem' keyspec wkgrip db pemFromPacket

show_pem' :: String -> String -> KeyDB -> (Packet -> Either String b) -> Either String b
show_pem' keyspec wkgrip db keyfmt = do
    let s = parseSpec wkgrip keyspec
    flip (maybe . Left $ keyspec ++ ": not found")
         (selectPublicKey s db)
         keyfmt

warn :: String -> IO ()
warn str = hPutStrLn stderr str

show_ssh :: String -> String -> KeyDB -> IO ()
show_ssh keyspec wkgrip db = either warn putStrLn $ show_ssh' keyspec wkgrip db

show_ssh' :: String -> String -> KeyDB -> Either String String
show_ssh' keyspec wkgrip db = do
    let s = parseSpec wkgrip keyspec
    flip (maybe . Left $ keyspec ++ ": not found")
         (selectPublicKey s db)
         $ return . sshblobFromPacket

-- |
-- interpolate %var patterns in a string.
interp :: Map.Map String String -> String -> String
interp vars raw = es >>= interp1
 where
    gs = groupBy (\_ c -> c/='%') raw
    es = dropWhile null $ gobbleEscapes ("":gs)
            where gobbleEscapes :: [String] -> [String]
                  gobbleEscapes (a:"%":b:bs) = (a++b) : gobbleEscapes bs
                  gobbleEscapes (g:gs)       = g : gobbleEscapes gs
                  gobbleEscapes []           = []
    interp1 ('%':'(':str) = fromMaybe "" (Map.lookup key vars) ++ drop 1 rest
                            where (key,rest) = break (==')') str
    interp1 plain = plain

sshblobFromPacket :: Packet -> String
sshblobFromPacket k = Char8.unpack $ fromJust $ sshblobFromPacketL k

sshblobFromPacketL :: Packet -> Maybe Char8.ByteString
sshblobFromPacketL k = do
    RSAKey (MPI n) (MPI e) <- rsaKeyFromPacket k
    return $ SSH.keyblob (n,e)

{-
replaceSshServerKeys root cmn = do
    let homepass' = cmn { cap_homespec = fmap root (cap_homespec cmn) }
        replaceSSH op = op { opFiles = files }
            where
                files = Map.adjust delssh HomeSec
                        $ Map.adjust delssh HomePub
                        $ Map.insert (ArgFile $ root "/etc/ssh/ssh_host_rsa_key") strm $ opFiles op
                strm = streaminfo { typ = PEMFile, spill = KF_Match "ssh-server", access = Sec }
                delssh strm = strm { transforms = DeleteSubkeyByUsage "ssh-server" : transforms strm
                                   , fill = KF_All }
    KikiResult r report <- runKeyRing $ minimalOp homepass'
    case r of
        KikiSuccess rt -> Kiki.refreshCache rt $ case root "" of
                                                    "/" -> Nothing
                                                    ""  -> Nothing
                                                    pth -> Just pth
        err            -> hPutStrLn stderr $ errorString err
-}

slash :: String -> String -> String
slash "/"    ('/':xs) = '/':xs
slash ""     ('/':xs) = '/':xs
slash ""     xs       = '/':xs
slash (y:ys) xs       = y:slash ys xs

dashdashChroot :: Args (FilePath -> FilePath)
dashdashChroot = pure (\r a -> slash r a) <*> arg "--chroot" <|> pure id

dashdashHomedir :: Args CommonArgsParsed
dashdashHomedir = CommonArgsParsed
                <$> optional (arg "--homedir")
                <*> optional (FileDesc <$> read <$> arg "--passphrase-fd")

dashdashCipher :: Args SymmetricAlgorithm
dashdashCipher = fromMaybe CAST5 <$> optional (cipherFromString <$> arg "--cipher")

kikiOptions :: ( [(String,Int)], [String] )
kikiOptions = ( ss, ps )
 where
    ss = [("--chroot",1),("--passphrase-fd",1),("--homedir",1),("--cipher",1)]
    ps = []