From 823ebff934cf2e23afae199c24cc599983209438 Mon Sep 17 00:00:00 2001
From: Joey Hess <joeyh@joeyh.name>
Date: Fri, 23 Sep 2016 17:42:45 -0400
Subject: Added --chaff-max-delay option for slower chaffing.

This commit was sponsored by Jeff Goeke-Smith on Patreon.
---
 CmdLine.hs | 57 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 40 insertions(+), 17 deletions(-)

(limited to 'CmdLine.hs')

diff --git a/CmdLine.hs b/CmdLine.hs
index 4011f56..bb68623 100644
--- a/CmdLine.hs
+++ b/CmdLine.hs
@@ -8,6 +8,7 @@ module CmdLine where
 import Types
 import Types.Storage
 import Types.Server (HostName)
+import Types.Cost (Seconds(..))
 import Tunables
 import qualified Gpg
 import Options.Applicative
@@ -27,6 +28,7 @@ data CmdLine = CmdLine
 	, name :: Maybe Name
 	, othername :: Maybe Name
 	, serverConfig :: ServerConfig
+	, chaffMaxDelay :: Maybe Seconds
 	}
 
 data Mode = Backup | Restore | UploadQueued | AutoStart | Server | BackupServer FilePath | RestoreServer FilePath | Chaff HostName | Benchmark | Test
@@ -43,13 +45,14 @@ parse = CmdLine
 	<$> optional parseMode
 	<*> optional (gpgswitch <|> fileswitch)
 	<*> localstorageswitch
-	<*> localstoragedirectoryopt
+	<*> optional localstoragedirectoryopt
 	<*> guiswitch
 	<*> testmodeswitch
-	<*> optional (ShareParams <$> totalobjects <*> neededobjects)
-	<*> nameopt
-	<*> othernameopt
+	<*> optional parseShareParams
+	<*> optional nameopt
+	<*> optional othernameopt
 	<*> parseServerConfig
+	<*> optional chaffmaxdelayopt
   where
 	gpgswitch = GpgKey . KeyId . T.pack <$> strOption
 		( long "gpgkeyid"
@@ -65,7 +68,7 @@ parse = CmdLine
 		( long "store-local"
 		<> help "Store data locally. (The default is to store data in the cloud.)"
 		)
-	localstoragedirectoryopt = optional $ LocalStorageDirectory <$> option str
+	localstoragedirectoryopt = LocalStorageDirectory <$> option str
 		( long "store-directory"
 		<> metavar "DIR"
 		<> help "Where to store data locally. (default: ~/.keysafe/objects/)"
@@ -78,26 +81,21 @@ parse = CmdLine
 		( long "gui"
 		<> help "Use GUI interface for interaction. Default is to use readline interface when run in a terminal, and GUI otherwise."
 		)
-	totalobjects = option auto 
-		( long "totalshares"
-		<> metavar "M"
-		<> help ("Configure the number of shares to split encrypted secret key into. (default: " ++ show (totalObjects (shareParams defaultTunables)) ++ ") (When this option is used to back up a key, it must also be provided at restore time.)")
-		)
-	neededobjects = option auto 
-		( long "neededshares"
-		<> metavar "N"
-		<> help ("Configure the number of shares needed to restore. (default: " ++ show (neededObjects (shareParams defaultTunables)) ++ ") (When this option is used to back up a key, it must also be provided at restore time.)")
-		)
-	nameopt = optional $ Name . BU8.fromString <$> strOption
+	nameopt = option nameOption
 		( long "name"
 		<> metavar "N"
 		<> help "Specify name used for key backup/restore, avoiding the usual prompt."
 		)
-	othernameopt = optional $ Name . BU8.fromString <$> strOption
+	othernameopt = option nameOption
 		( long "othername"
 		<> metavar "N"
 		<> help "Specify other name used for key backup/restore, avoiding the usual prompt."
 		)
+	chaffmaxdelayopt = option secondsOption
+		( long "chaff-max-delay"
+		<> metavar "SECONDS"
+		<> help "Specify a delay between chaff uploads. Will delay a random amount between 0 and this many seconds."
+		)
 
 parseMode :: Parser Mode
 parseMode = 
@@ -145,6 +143,25 @@ parseMode =
 		<> help "Run test suite."
 		)
 
+parseShareParams :: Parser ShareParams
+parseShareParams = ShareParams <$> totalobjects <*> neededobjects
+  where
+	totalobjects = option auto 
+		( long "totalshares"
+		<> metavar "M"
+		<> help ("Configure the number of shares to split encrypted secret key into. "
+			++ showdefault totalObjects ++ neededboth)
+		)
+	neededobjects = option auto 
+		( long "neededshares"
+		<> metavar "N"
+		<> help ("Configure the number of shares needed to restore. " 
+			++ showdefault neededObjects ++ neededboth)
+		)
+	showdefault f = "(default: " ++ show (f (shareParams defaultTunables)) ++ ")"
+	neededboth = " (When this option is used to back up a key, it must also be provided at restore time.)"
+	
+
 parseServerConfig :: Parser ServerConfig
 parseServerConfig = ServerConfig
 	<$> option auto
@@ -193,3 +210,9 @@ customizeShareParams :: CmdLine -> Tunables -> Tunables
 customizeShareParams cmdline t = case customShareParams cmdline of
 	Nothing -> t
 	Just ps -> t { shareParams = ps }
+
+secondsOption :: ReadM Seconds
+secondsOption = Seconds . toRational <$> (auto :: ReadM Double)
+
+nameOption :: ReadM Name
+nameOption = Name . BU8.fromString <$> auto
-- 
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