Improve TLS settings

README.md

@@ -33,11 +33,15 @@ The default values are:
 hostname = "localhost"
 port     = 3000
 urltable = "$XDG_CONFIG_HOME/breve"
-cert     = "/usr/share/tls/breve.crt"
-key      = "/usr/share/tls/breve.key"
+tls {
+  cert  = "/usr/share/tls/breve.crt"
+  key   = "/usr/share/tls/breve.key"
+  chain = []
+}
 ```
 
 `urltable` is the location of breve url hashtable
+`chain` is a list of chain certificate files
 
 ## License
 

breve.cabal

@@ -29,7 +29,7 @@ executable breve
   other-modules:     Application, Views, Breve.Settings,
                      Breve.Generator, Breve.UrlTable
   other-extensions:  OverloadedStrings
-  build-depends:     base >=4.8 && <5.0, warp, warp-tls,
+  build-depends:     base >=4.8 && <5.0, warp, warp-tls, tls,
                      Spock, blaze-html, http-types,
                      wai, wai-middleware-static, wai-extra,
                      transformers, mtl,

src/Breve/Settings.hs

@@ -1,21 +1,25 @@
 {-# LANGUAGE OverloadedStrings #-}
+
 module Breve.Settings where
 
 import Control.Monad                   (when)
 import System.Environment              (lookupEnv)
 import System.Environment.XDG.BaseDir
 import System.Directory                (doesFileExist)
+import Data.Text                       (Text, pack)
 import Data.Configurator
 import Data.Monoid
-import Data.Text                       (Text, pack)
-import Network.Wai.Handler.WarpTLS     (tlsSettings, TLSSettings)
+
+import Network.Wai.Handler.WarpTLS     (TLSSettings (..), tlsSettingsChain)
+import Network.TLS                     (Version (..))
+import Network.TLS.Extra               (ciphersuite_strong)
 
 data AppSettings = AppSettings
-  { bindHost :: Text
-  , bindPort :: Int
-  , bindUrl  :: Text
-  , urlTable :: FilePath
-  , tlsSetts :: TLSSettings
+  { bindHost    :: Text
+  , bindPort    :: Int
+  , bindUrl     :: Text
+  , urlTable    :: FilePath
+  , tlsSettings :: TLSSettings
   }
 
 
@@ -33,9 +37,10 @@ settings = do
   config <- load [Required configPath]
   host   <- lookupDefault "localhost"                config "hostname"
   port   <- lookupDefault 3000                       config "port"    
-  cert   <- lookupDefault "/usr/share/tls/breve.crt" config "cert"
-  key    <- lookupDefault "/usr/share/tls/breve.key" config "key"
   urls   <- lookupDefault urlsPath                   config "urltable"
+  cert   <- lookupDefault "/usr/share/tls/breve.crt" config "tls.cert"
+  key    <- lookupDefault "/usr/share/tls/breve.key" config "tls.key"
+  chain  <- lookupDefault []                         config "tls.chain"
 
   createEmptyIfMissing urls
 
@@ -43,11 +48,15 @@ settings = do
       url  = if port == 443
                then base
                else base <> ":" <> pack (show port)
+      tls = (tlsSettingsChain cert chain key)
+        { tlsAllowedVersions = [TLS12, TLS11]
+        , tlsCiphers = ciphersuite_strong
+        }
 
   return AppSettings
     { bindHost = host
     , bindPort = port
     , bindUrl  = url <> "/"
     , urlTable = urls
-    , tlsSetts = tlsSettings cert key
+    , tlsSettings = tls
     }

src/Main.hs

@@ -13,8 +13,8 @@ import Network.Wai.Handler.WarpTLS (runTLS, TLSSettings)
 import Network.Wai.Handler.Warp    (run, defaultSettings, setPort)
 
 runBreve :: TLSSettings -> Int -> SpockT IO () -> IO ()
-runBreve tls port spock =
-  spockAsApp (spockT id spock) >>= runTLS tls settings
+runBreve tlsSettings port spock =
+  spockAsApp (spockT id spock) >>= runTLS tlsSettings settings
   where settings = setPort port defaultSettings
 
 
@@ -34,4 +34,4 @@ main = do
   when (bindPort == 443) (forkIO' $ runTLSRedirect bindHost)
 
   putStrLn ("Serving on " ++ unpack bindUrl)
-  runBreve tlsSetts bindPort (app bindUrl table)
+  runBreve tlsSettings bindPort (app bindUrl table)