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{-
Copyright (C) 2009 John MacFarlane <jgm@berkeley.edu>,
Henry Laxen <nadine.and.henry@pobox.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- Handlers for registering and authenticating users.
-}
module Network.Gitit.Authentication (formAuthHandlers, httpAuthHandlers, loginUserForm) where
import Network.Gitit.State
import Network.Gitit.Types
import Network.Gitit.Framework
import Network.Gitit.Layout
import Network.Gitit.Server
import Network.Gitit.Util
import Network.Captcha.ReCaptcha (captchaFields, validateCaptcha)
import Text.XHtml hiding ( (</>), dir, method, password, rev )
import qualified Text.XHtml as X ( password )
import System.Process (readProcessWithExitCode)
import Control.Monad (unless, liftM)
import Control.Monad.Trans (MonadIO(), liftIO)
import System.Exit
import System.Log.Logger (logM, Priority(..))
import Data.Char (isAlphaNum, isAlpha, isAscii)
import Text.Pandoc.Shared (substitute)
import Data.Maybe (isJust, fromJust)
import Network.URL (encString, exportURL, add_param, importURL)
import Network.BSD (getHostName)
import qualified Text.StringTemplate as T
import Network.HTTP (urlEncodeVars)
import Codec.Binary.UTF8.String (encodeString)
data ValidationType = Register
| ResetPassword
deriving (Show,Read)
registerUser :: Params -> Handler
registerUser params = do
result' <- sharedValidation Register params
case result' of
Left errors -> registerForm >>=
formattedPage defaultPageLayout{
pgMessages = errors,
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Register for an account"
}
Right (uname, email, pword) -> do
user <- liftIO $ mkUser uname email pword
addUser uname user
loginUser params{ pUsername = uname,
pPassword = pword,
pEmail = email }
resetPasswordRequestForm :: Params -> Handler
resetPasswordRequestForm _ = do
let passwordForm = gui "" ! [identifier "resetPassword"] << fieldset <<
[ label << "Username: "
, textfield "username" ! [size "20", intAttr "tabindex" 1], stringToHtml " "
, submit "resetPassword" "Reset Password" ! [intAttr "tabindex" 2]]
cfg <- getConfig
let contents = if null (mailCommand cfg)
then p << "Sorry, password reset not available."
else passwordForm
formattedPage defaultPageLayout{
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Reset your password" }
contents
resetPasswordRequest :: Params -> Handler
resetPasswordRequest params = do
let uname = pUsername params
mbUser <- getUser uname
let errors = case mbUser of
Nothing -> ["Unknown user. Please re-register " ++
"or press the Back button to try again."]
Just u -> ["Since you did not register with " ++
"an email address, we can't reset your password." |
null (uEmail u) ]
if null errors
then do
let response =
p << [ stringToHtml "An email has been sent to "
, bold $ stringToHtml . uEmail $ fromJust mbUser
, br
, stringToHtml
"Please click on the enclosed link to reset your password."
]
sendReregisterEmail (fromJust mbUser)
formattedPage defaultPageLayout{
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Resetting your password"
}
response
else registerForm >>=
formattedPage defaultPageLayout{
pgMessages = errors,
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Register for an account"
}
resetLink :: String -> User -> String
resetLink base' user =
exportURL $ foldl add_param
(fromJust . importURL $ base' ++ "/_doResetPassword")
[("username", uUsername user), ("reset_code", take 20 (pHashed (uPassword user)))]
sendReregisterEmail :: User -> GititServerPart ()
sendReregisterEmail user = do
cfg <- getConfig
hostname <- liftIO getHostName
base' <- getWikiBase
let messageTemplate = T.newSTMP $ resetPasswordMessage cfg
let filledTemplate = T.render .
T.setAttribute "username" (uUsername user) .
T.setAttribute "useremail" (uEmail user) .
T.setAttribute "hostname" hostname .
T.setAttribute "port" (show $ portNumber cfg) .
T.setAttribute "resetlink" (resetLink base' user) $
messageTemplate
let (mailcommand:args) = words $ substitute "%s" (uEmail user)
(mailCommand cfg)
(exitCode, _pOut, pErr) <- liftIO $ readProcessWithExitCode mailcommand args
filledTemplate
liftIO $ logM "gitit" WARNING $ "Sent reset password email to " ++ uUsername user ++
" at " ++ uEmail user
unless (exitCode == ExitSuccess) $
liftIO $ logM "gitit" WARNING $ mailcommand ++ " failed. " ++ pErr
validateReset :: Params -> (User -> Handler) -> Handler
validateReset params postValidate = do
let uname = pUsername params
user <- getUser uname
let knownUser = isJust user
let resetCodeMatches = take 20 (pHashed (uPassword (fromJust user))) ==
pResetCode params
let errors = case (knownUser, resetCodeMatches) of
(True, True) -> []
(True, False) -> ["Your reset code is invalid"]
(False, _) -> ["User " ++ uname ++ " is not known"]
if null errors
then postValidate (fromJust user)
else registerForm >>=
formattedPage defaultPageLayout{
pgMessages = errors,
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Register for an account"
}
resetPassword :: Params -> Handler
resetPassword params = validateReset params $ \user ->
resetPasswordForm (Just user) >>=
formattedPage defaultPageLayout{
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Reset your registration info"
}
doResetPassword :: Params -> Handler
doResetPassword params = validateReset params $ \user -> do
result' <- sharedValidation ResetPassword params
case result' of
Left errors ->
resetPasswordForm (Just user) >>=
formattedPage defaultPageLayout{
pgMessages = errors,
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Reset your registration info"
}
Right (uname, email, pword) -> do
user' <- liftIO $ mkUser uname email pword
adjustUser uname user'
liftIO $ logM "gitit" WARNING $
"Successfully reset password and email for " ++ uUsername user'
loginUser params{ pUsername = uname,
pPassword = pword,
pEmail = email }
registerForm :: GititServerPart Html
registerForm = sharedForm Nothing
resetPasswordForm :: Maybe User -> GititServerPart Html
resetPasswordForm = sharedForm -- synonym for now
sharedForm :: Maybe User -> GititServerPart Html
sharedForm mbUser = withData $ \params -> do
cfg <- getConfig
dest <- case pDestination params of
"" -> getReferer
x -> return x
let accessQ = case accessQuestion cfg of
Nothing -> noHtml
Just (prompt, _) -> label << prompt +++ br +++
X.password "accessCode" ! [size "15", intAttr "tabindex" 1]
+++ br
let captcha = if useRecaptcha cfg
then captchaFields (recaptchaPublicKey cfg) Nothing
else noHtml
let initField field = case mbUser of
Nothing -> ""
Just user -> field user
let userNameField = case mbUser of
Nothing -> label <<
"Username (at least 3 letters or digits):"
+++ br +++
textfield "username" ! [size "20", intAttr "tabindex" 2] +++ br
Just user -> label << ("Username (cannot be changed): "
++ uUsername user) +++ br
let submitField = case mbUser of
Nothing -> submit "register" "Register"
Just _ -> submit "resetPassword" "Reset Password"
return $ gui "" ! [identifier "loginForm"] << fieldset <<
[ accessQ
, userNameField
, label << "Email (optional, will not be displayed on the Wiki):"
, br
, textfield "email" ! [size "20", intAttr "tabindex" 3, value (initField uEmail)], br
, textfield "full_name_1" ! [size "20", theclass "req"]
, label << ("Password (at least 6 characters," ++
" including at least one non-letter):")
, br
, X.password "password" ! [size "20", intAttr "tabindex" 4]
, stringToHtml " "
, br
, label << "Confirm Password:"
, br
, X.password "password2" ! [size "20", intAttr "tabindex" 5]
, stringToHtml " "
, br
, captcha
, textfield "destination" ! [thestyle "display: none;", value dest]
, submitField ! [intAttr "tabindex" 6]]
sharedValidation :: ValidationType
-> Params
-> GititServerPart (Either [String] (String,String,String))
sharedValidation validationType params = do
let isValidUsername u = length u >= 3 && all isAlphaNum u
let isValidPassword pw = length pw >= 6 && not (all isAlpha pw)
let accessCode = pAccessCode params
let uname = pUsername params
let pword = pPassword params
let pword2 = pPassword2 params
let email = pEmail params
let fakeField = pFullName params
let recaptcha = pRecaptcha params
taken <- isUser uname
cfg <- getConfig
let optionalTests Register =
[(taken, "Sorry, that username is already taken.")]
optionalTests ResetPassword = []
let isValidAccessCode = case accessQuestion cfg of
Nothing -> True
Just (_, answers) -> accessCode `elem` answers
let isValidEmail e = length (filter (=='@') e) == 1
peer <- liftM (fst . rqPeer) askRq
captchaResult <-
if useRecaptcha cfg
then if null (recaptchaChallengeField recaptcha) ||
null (recaptchaResponseField recaptcha)
-- no need to bother captcha.net in this case
then return $ Left "missing-challenge-or-response"
else liftIO $ do
mbIPaddr <- lookupIPAddr peer
let ipaddr = case mbIPaddr of
Just ip -> ip
Nothing -> error $
"Could not find ip address for " ++
peer
ipaddr `seq` validateCaptcha (recaptchaPrivateKey cfg)
ipaddr (recaptchaChallengeField recaptcha)
(recaptchaResponseField recaptcha)
else return $ Right ()
let (validCaptcha, captchaError) =
case captchaResult of
Right () -> (True, Nothing)
Left err -> (False, Just err)
let errors = validate $ optionalTests validationType ++
[ (not isValidAccessCode, "Incorrect response to access prompt.")
, (not (isValidUsername uname),
"Username must be at least 3 charcaters, all letters or digits.")
, (not (isValidPassword pword),
"Password must be at least 6 characters, " ++
"and must contain at least one non-letter.")
, (not (null email) && not (isValidEmail email),
"Email address appears invalid.")
, (pword /= pword2,
"Password does not match confirmation.")
, (not validCaptcha,
"Failed CAPTCHA (" ++ fromJust captchaError ++
"). Are you really human?")
, (not (null fakeField), -- fakeField is hidden in CSS (honeypot)
"You do not seem human enough. If you're sure you are human, " ++
"try turning off form auto-completion in your browser.")
]
return $ if null errors then Right (uname, email, pword) else Left errors
-- user authentication
loginForm :: String -> GititServerPart Html
loginForm dest = do
cfg <- getConfig
base' <- getWikiBase
return $ gui (base' ++ "/_login") ! [identifier "loginForm"] <<
fieldset <<
[ label << "Username "
, textfield "username" ! [size "15", intAttr "tabindex" 1]
, stringToHtml " "
, label << "Password "
, X.password "password" ! [size "15", intAttr "tabindex" 2]
, stringToHtml " "
, textfield "destination" ! [thestyle "display: none;", value dest]
, submit "login" "Login" ! [intAttr "tabindex" 3]
] +++
p << [ stringToHtml "If you do not have an account, "
, anchor ! [href $ base' ++ "/_register?" ++
urlEncodeVars [("destination", encodeString dest)]] << "click here to get one."
] +++
if null (mailCommand cfg)
then noHtml
else p << [ stringToHtml "If you forgot your password, "
, anchor ! [href $ base' ++ "/_resetPassword"] <<
"click here to get a new one."
]
loginUserForm :: Handler
loginUserForm = withData $ \params -> do
dest <- case pDestination params of
"" -> getReferer
x -> return x
loginForm dest >>=
formattedPage defaultPageLayout{ pgShowPageTools = False,
pgTabs = [],
pgTitle = "Login",
pgMessages = pMessages params
}
loginUser :: Params -> Handler
loginUser params = do
let uname = pUsername params
let pword = pPassword params
let destination = pDestination params
allowed <- authUser uname pword
cfg <- getConfig
if allowed
then do
key <- newSession (SessionData uname)
addCookie (sessionTimeout cfg) (mkCookie "sid" (show key))
seeOther (encUrl destination) $ toResponse $ p << ("Welcome, " ++ uname)
else
withMessages ["Invalid username or password."] loginUserForm
encUrl :: String -> String
encUrl = encString True isAscii
logoutUser :: Params -> Handler
logoutUser params = do
let key = pSessionKey params
dest <- case pDestination params of
"" -> getReferer
x -> return x
case key of
Just k -> do
delSession k
-- make cookie expire immediately, effectively deleting it
addCookie 0 (mkCookie "sid" "-1")
Nothing -> return ()
seeOther (encUrl dest) $ toResponse "You have been logged out."
registerUserForm :: Handler
registerUserForm = registerForm >>=
formattedPage defaultPageLayout{
pgShowPageTools = False,
pgTabs = [],
pgTitle = "Register for an account"
}
formAuthHandlers :: [Handler]
formAuthHandlers =
[ dir "_register" $ methodSP GET registerUserForm
, dir "_register" $ methodSP POST $ withData registerUser
, dir "_login" $ methodSP GET loginUserForm
, dir "_login" $ methodSP POST $ withData loginUser
, dir "_logout" $ methodSP GET $ withData logoutUser
, dir "_resetPassword" $ methodSP GET $ withData resetPasswordRequestForm
, dir "_resetPassword" $ methodSP POST $ withData resetPasswordRequest
, dir "_doResetPassword" $ methodSP GET $ withData resetPassword
, dir "_doResetPassword" $ methodSP POST $ withData doResetPassword
]
loginUserHTTP :: Params -> Handler
loginUserHTTP params = do
base' <- getWikiBase
let destination = pDestination params `orIfNull` (base' ++ "/")
seeOther (encUrl destination) $ toResponse ()
logoutUserHTTP :: Handler
logoutUserHTTP = unauthorized $ toResponse () -- will this work?
httpAuthHandlers :: [Handler]
httpAuthHandlers =
[ dir "_logout" $ logoutUserHTTP
, dir "_login" $ withData loginUserHTTP ]
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