modified the API not to allow custom certificate directories; wrote some haddock documentation to defer crl, ocsp, basicconstraints for the time-being

Network/XMPP/Session.hs

@@ -221,7 +221,7 @@ defaultState c t h s i = State { stateClientHandlers = h
 -- details on how they operate.
 
 connect :: MonadIO m => Session s m -> HostName -> PortNumber ->
-           Maybe (Maybe ([X509], Bool), ([X509] -> Bool), Maybe [String]) ->
+           Maybe (Maybe [X509], ([X509] -> Bool)) ->
            Maybe (UserName, Password, Maybe Resource) ->
            (ConnectResult -> StateT s m ()) -> StateT s m ()
 
@@ -229,8 +229,8 @@ connect s h p t a c = openStreams s h p connect'
   where
     connect' r = case r of
       OpenStreamSuccess _ _ -> case t of -- TODO: Check for TLS support?
-        Just (certificate, certificateValidator, paths) ->
-          tlsSecureStreams s certificate certificateValidator paths connect''
+        Just (certificate, certificateValidator) ->
+          tlsSecureStreams s certificate certificateValidator connect''
         Nothing -> connect'' (SecureWithTLSSuccess 1.0 "") -- TODO
       OpenStreamFailure -> c ConnectOpenStreamFailure
     connect'' r = case r of
@@ -257,25 +257,29 @@ openStreams s h p c = CMS.get >>=
 -- Tries to secure the connection with TLS.
 --
 -- If the list of certificates is provided, they will be presented to the
--- server; the boolean value controls whether the client will show its
--- certificates before the server has authed.
+-- server.
 --
 -- The third parameter is an optional custom validation function for the server
 -- certificates. Note that Pontarius XMPP will perform its own validation
 -- according to the RFC 6120, including comparing the domain name specified in
 -- the certificate against the connected server, as well as checking the
--- integrity, the certificate authority, and CRL and\/or OCSP repositories of
--- the certificate chain. The fourth parameter is a list of directories that
--- contains trusted certificate authorities.
+-- integrity, and the certificate authorities.
+--
+-- Note: The current implementation of `certificate' looks for trusted
+-- certificates in the /etc/ssl/certs directory.
+--
+-- Note: The current implementation of `certificate' does not support parsing
+-- X509 extensions. Because of this, we will defer checking CRLs and/or OCSP
+-- services as well as checking for the basicConstraints cA boolean for the
+-- time-being.
 
-tlsSecureStreams :: MonadIO m => Session s m -> Maybe ([X509], Bool) ->
-                 ([X509] -> Bool) -> Maybe [String] ->
-                 (SecureWithTLSResult -> StateT s m ()) -> StateT s m ()
+tlsSecureStreams :: MonadIO m => Session s m -> Maybe [X509] ->
+                 ([X509] -> Bool) -> (SecureWithTLSResult -> StateT s m ()) -> StateT s m ()
 
-tlsSecureStreams s c a p c_ = CMS.get >>=
+tlsSecureStreams s c a c_ = CMS.get >>=
                          (\ state -> lift $ liftIO $
                                      writeChan (sessionChannel s)
-                                     (IEC (CESecureWithTLS c a p c_)))
+                                     (IEC (CESecureWithTLS c a c_)))
 
 
 -- |
@@ -439,7 +443,7 @@ processEvent e = get >>= \ state ->
         put $ state { stateShouldExit = True }
         return $ Just e
 
-  IEC (CESecureWithTLS certificate verifyCertificate paths callback) -> do
+  IEC (CESecureWithTLS certificate verifyCertificate callback) -> do
     -- CEB.assert (not $ isTLSSecured (stateStreamState state)) (return ())
     let Connected _ handle = stateConnectionState state
     lift $ liftIO $ send "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>" (Left handle)

Network/XMPP/Types.hs

@@ -393,7 +393,7 @@ data AuthenticationState = NoAuthentication | AuthenticatingPreChallenge1 String
 
 data ClientEvent s m = CEOpenStream N.HostName PortNumber
                        (OpenStreamResult -> StateT s m ()) |
-                       CESecureWithTLS (Maybe ([X509], Bool)) ([X509] -> Bool) (Maybe [String])
+                       CESecureWithTLS (Maybe [X509]) ([X509] -> Bool)
                        (SecureWithTLSResult -> StateT s m ()) |
                        CEAuthenticate UserName Password (Maybe Resource)
                        (AuthenticateResult -> StateT s m ()) |
@@ -404,7 +404,7 @@ data ClientEvent s m = CEOpenStream N.HostName PortNumber
 
 instance Show (ClientEvent s m) where
   show (CEOpenStream h p _) = "CEOpenStream " ++ h ++ " " ++ (show p)
-  show (CESecureWithTLS c _ _ _) = "CESecureWithTLS " ++ (show c)
+  show (CESecureWithTLS c _ _) = "CESecureWithTLS " ++ (show c)
   show (CEAuthenticate u p r _) = "CEAuthenticate " ++ u ++ " " ++ p ++ " " ++
                                     (show r)
   show (CEIQ s _ _ _) = "CEIQ"