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{-
shareguard-authnz-external: mod_authnz_external-to-ShareGuard interface
Copyright (C) 2011, 2014 Clint Adams <clint@gnu.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-}
import Control.Exception.Base (catch)
import System.Exit ( exitWith, ExitCode (..) )
import System.Environment
import System.IO.Error
import Control.Monad.Trans
import Control.Monad.Error
import System.Path.NameManip (normalise_path, guess_dotdot, slice_path)
import Config as C
import DB as D
data AuthQuery = AuthQuery { uname :: String
, pass :: String
, uri :: String
}
main = do
uri <- catch (getEnv "URI") envvarHandler
cnf <- C.getConfig "/usr/local/etc/shareguard.conf"
user <- getLine
pw <- getLine
passwords <- D.withDB cnf $ \db -> getUserPw db
let dbpass = snd $ head $ filter ((==user).fst) passwords
alldirs <- D.withDB cnf $ \db -> getUserDirs db
let dirs = map ('/' :) (map snd (filter ((user ==) . fst) alldirs))
if isValidRequest (AuthQuery user pw uri) dbpass dirs
then exitWith (ExitSuccess)
else exitWith (ExitFailure 1)
envvarHandler :: IOError -> IO (String)
envvarHandler e
| isDoesNotExistError e = return ""
| otherwise = ioError e
isValidRequest :: AuthQuery -> String -> [String] -> Bool
isValidRequest (AuthQuery {uname = u, pass = p, uri = req}) dbpass dirs =
and [isCorrectPassword p dbpass,
isAuthorizedURI (rootDir $ sanitizeURI req) dirs]
isCorrectPassword :: String -> String -> Bool
isCorrectPassword p1 p2 =
and [p1 == p2, p2 /= ""]
isAuthorizedURI :: Maybe String -> [String] -> Bool
isAuthorizedURI Nothing _ = False
isAuthorizedURI (Just req) dirs =
elem req dirs
rootDir :: Maybe String -> Maybe String
rootDir Nothing = Nothing
rootDir (Just x) = Just (head (slice_path x))
sanitizeURI :: String -> Maybe String
sanitizeURI uri =
guess_dotdot (normalise_path uri)
|
