feat(auth): oidc based sso for auth protected routes

config/settings.yml

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2022 Gregor Kleen <gregor.kleen@ifi.lmu.de>,Sarah Vaupel <sarah.vaupel@ifi.lmu.de>,Steffen Jost <jost@tcs.ifi.lmu.de>,Wolfgang Witt <Wolfgang.Witt@campus.lmu.de>
+# SPDX-FileCopyrightText: 2022-2024 Gregor Kleen <gregor.kleen@ifi.lmu.de>,Sarah Vaupel <sarah.vaupel@ifi.lmu.de>,Steffen Jost <jost@tcs.ifi.lmu.de>,Wolfgang Witt <Wolfgang.Witt@campus.lmu.de>,David Mosbach <david.mosbach@uniworx.de>
 #
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
@@ -131,6 +131,8 @@ database:
 
 auto-db-migrate: '_env:AUTO_DB_MIGRATE:true'
 
+single-sign-on: "_env:OIDC_SSO:true"
+
 ldap:
   - host:    "_env:LDAPHOST:"
     tls:     "_env:LDAPTLS:"

src/Auth/OAuth2.hs

@@ -8,7 +8,7 @@ module Auth.OAuth2
 ( AzureUserException(..)
 , azurePluginName
 , oauth2MockServer
-, mockPluginName 
+, mockPluginName
 , queryOAuth2User
 , UserDataException
 ) where
@@ -36,9 +36,9 @@ instance Exception AzureUserException
 azurePluginName :: Text
 azurePluginName = "azureadv2"
 
-----------------------------------------
----- OAuth2 development auth plugin ----
-----------------------------------------
+-----------------------------------------------
+---- OAuth2 + OIDC development auth plugin ----
+-----------------------------------------------
 
 mockPluginName :: Text
 mockPluginName = "dev-oauth2-mock"
@@ -53,7 +53,11 @@ oauth2MockServer port =
   let oa = OAuth2
             { oauth2ClientId = "42"
             , oauth2ClientSecret = Just "shhh"
-            , oauth2AuthorizeEndpoint = (fromString $ mockServerURL <> "/auth") `withQuery` [scopeParam " " ["ID", "Profile"]]
+            , oauth2AuthorizeEndpoint = (fromString $ mockServerURL <> "/auth")
+              `withQuery` [ scopeParam " " ["openid", "profile", "email", "offline_access"] -- TODO read scopes from config
+                          , ("response_type", "code id_token")
+                          , ("nonce", "Foo") -- TODO generate meaningful value
+                          ]
             , oauth2TokenEndpoint = fromString $ mockServerURL <> "/token"
             , oauth2RedirectUri = Nothing
             }
@@ -94,7 +98,8 @@ queryOAuth2User userID = runExceptT $ do
   setSessionJson SessionOAuth2Token (Just $ accessToken newTokens, refreshToken newTokens)
   eResult <- lift $ getResponseBody <$> httpJSONEither @m @j (req
     { secure = secure
-    , requestHeaders = [("Authorization", encodeUtf8 . ("Bearer " <>) . atoken $ accessToken newTokens)] })
+    , requestHeaders = [("Authorization", encodeUtf8 . ("Bearer " <>) . atoken $ accessToken newTokens)]
+    })
   case eResult of
     Left x -> throwE $ UserDataJSONException x
     Right x -> return x
@@ -130,8 +135,8 @@ refreshOAuth2Token (_, rToken) url secure
     body' <- if secure then do
         clientID <- liftIO $ fromJust <$> lookupEnv "CLIENT_ID"
         clientSecret <- liftIO $ fromJust <$> lookupEnv "CLIENT_SECRET"
-        return $ body ++ [("client_id", fromString clientID), ("client_secret", fromString clientSecret), ("scope", "openid profile")]
-      else return $ ("scope", "ID Profile") : body
+        return $ body ++ [("client_id", fromString clientID), ("client_secret", fromString clientSecret), ("scope", "openid profile offline_access")] -- TODO read from config
+      else return $ ("scope", "openid profile offline_access") : body -- TODO read from config
     $logErrorS "\27[31mAdmin Handler\27[0m" $ tshow (requestBody $ urlEncodedBody body' req{ secure = secure })
     eResult <- lift $ getResponseBody <$> httpJSONEither @m @OAuth2Token (urlEncodedBody body' req{ secure = secure })
     case eResult of
@@ -142,3 +147,4 @@ refreshOAuth2Token (_, rToken) url secure
 instance Show RequestBody where
   show (RequestBodyLBS x) = show x
   show _ = error ":("
+

src/Foundation/Instances.hs

@@ -11,11 +11,14 @@ module Foundation.Instances
   , unsafeHandler
   ) where
 
+import qualified Prelude as P
+
 import Import.NoFoundation
 
 import qualified Data.Text as Text
 import Data.List (inits)
 
+import Yesod.Auth.OAuth2
 import qualified Yesod.Core.Unsafe as Unsafe
 import qualified Yesod.Auth.Message as Auth
 
@@ -23,6 +26,7 @@ import Utils.Form
 import Auth.LDAP
 import Auth.PWHash
 import Auth.Dummy
+import Auth.OAuth2
 
 import qualified Foundation.Yesod.Session as UniWorX
 import qualified Foundation.Yesod.Middleware as UniWorX
@@ -133,17 +137,20 @@ instance YesodAuth UniWorX where
     redirectToReferer _ = True
 
     loginHandler = do
+      plugins <- getsYesod authPlugins
+      AppSettings{..} <- getsYesod appSettings'
+
+      when appSingleSignOn $ do
+        let plugin = P.head $ P.filter ((`elem` [mockPluginName, azurePluginName]) . apName) plugins
+            pieces = case oauth2Url (apName plugin) of
+                      PluginR _ p -> p
+                      _ -> error "Unexpected OAuth2 AuthRoute"
+        void $ apDispatch plugin "GET" pieces
+
       toParent <- getRouteToParent
       liftHandler . defaultLayout $ do
-        plugins <- getsYesod authPlugins
         $logDebugS "Auth" $ "Enabled plugins: " <> Text.intercalate ", " (map apName plugins)
-
-#ifdef DEVELOPMENT
         mPort <- liftIO $ lookupEnv "OAUTH2_SERVER_PORT"
-#else
-        let mPort = Nothing
-#endif
-
         setTitleI MsgLoginTitle
         $(widgetFile "login")
 

src/Settings.hs

@@ -1,4 +1,4 @@
--- SPDX-FileCopyrightText: 2022 Gregor Kleen <gregor.kleen@ifi.lmu.de>,Sarah Vaupel <sarah.vaupel@ifi.lmu.de>,Steffen Jost <jost@tcs.ifi.lmu.de>
+-- SPDX-FileCopyrightText: 2022-2024 Gregor Kleen <gregor.kleen@ifi.lmu.de>,Sarah Vaupel <sarah.vaupel@ifi.lmu.de>,Steffen Jost <jost@tcs.ifi.lmu.de>,David Mosbach <david.mosbach@uniworx.de>
 --
 -- SPDX-License-Identifier: AGPL-3.0-or-later
 
@@ -96,6 +96,8 @@ data AppSettings = AppSettings
     , appDatabaseConf           :: PostgresConf
     -- ^ Configuration settings for accessing the database.
     , appAutoDbMigrate          :: Bool
+    , appSingleSignOn           :: Bool
+    -- ^ Enable OIDC single sign-on
     , appLdapConf               :: Maybe (PointedList LdapConf)
     -- ^ Configuration settings for CSV export/import to LMS (= Learn Management System)
     , appLmsConf                :: LmsConf
@@ -627,6 +629,7 @@ instance FromJSON AppSettings where
         appWebpackEntrypoints     <- o .: "webpack-manifest"
         appDatabaseConf           <- o .: "database"
         appAutoDbMigrate          <- o .: "auto-db-migrate"
+        appSingleSignOn           <- o .: "single-sign-on"
         let nonEmptyHost LdapConf{..} = case ldapHost of
               Ldap.Tls host _ -> not $ null host
               Ldap.Plain host -> not $ null host