X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=src%2Fredirect.php;h=53a1d8b7117234af975c20bbe14cde1e1ee01b5b;hb=6cb3431f3b0a8210b2ec48df3a10af36b0336bf4;hp=dd9df62d3905f2a01b955010f4b63575204ca257;hpb=d81572f79656908a290adc913d4e89d5b2cb0a5f;p=squirrelmail.git

diff --git a/src/redirect.php b/src/redirect.php
index dd9df62d..53a1d8b7 100644
--- a/src/redirect.php
+++ b/src/redirect.php
@@ -5,7 +5,7 @@
  *
  * Derived from webmail.php by Ralf Kraudelt <kraude@wiwi.uni-rostock.de>
  *
- * @copyright &copy; 1999-2007 The SquirrelMail Project Team
+ * @copyright 1999-2013 The SquirrelMail Project Team
  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
  * @version $Id$
  * @package squirrelmail
@@ -23,7 +23,11 @@ require('../include/init.php');
 require_once(SM_PATH . 'functions/imap_general.php');
 require_once(SM_PATH . 'functions/strings.php');
 
+// Disable browser caching
+//
+header('Cache-Control: no-cache, no-store, must-revalidate, max-age=0');
 header('Pragma: no-cache');
+header('Expires: Sat, 1 Jan 2000 00:00:00 GMT');
 $location = get_location();
 
 // session_set_cookie_params (0, $base_uri);
@@ -70,11 +74,23 @@ if ($force_username_lowercase) {
 $imapConnection = sqimap_login($login_username, $key, $imapServerAddress, $imapPort, 0);
 /* From now on we are logged it. If the login failed then sqimap_login handles it */
 
-/* regenerate the session id to avoid session hyijacking */
-//FIXME!  IMPORTANT!  SOMEONE PLEASE EXPLAIN THE SECURITY CONCERN HERE; THIS session_destroy() BORKS ANY SESSION INFORMATION ADDED ON THE LOGIN PAGE (SPECIFICALLY THE SESSION RESTORE DATA, BUT ALSO ANYTHING ADDED BY PLUGINS, ETC)... I HAVE DISABLED THIS (AND NOTE THAT THE LOGIN PAGE ALREADY EXECUTES A session_destroy() (see includes/init.php)), SO PLEASE, WHOEVER ADDED THIS, PLEASE ANALYSE THIS SITUATION AND COMMENT ON IF IT IS OK LIKE THIS!!  WHAT HIJACKING ISSUES ARE WE SUPPOSED TO BE PREVENTING HERE?
-//sqsession_destroy();
-//@sqsession_is_active();
-//session_regenerate_id();
+/**
+ * Regenerate session id to make sure that authenticated session uses
+ * different ID than one used before user authenticated.  This is a
+ * countermeasure against session fixation attacks.
+ * NB: session_regenerate_id() was added in PHP 4.3.2 (and new session
+ *     cookie is only sent out in this call as of PHP 4.3.3), but PHP 4
+ *     is not vulnerable to session fixation problems in SquirrelMail
+ *     because it prioritizes $base_uri subdirectory cookies differently
+ *     than PHP 5, which is otherwise vulnerable.  If we really want to,
+ *     we could define our own session_regenerate_id() when one does not
+ *     exist, but there seems to be no reason to do so.
+ */
+sqsession_is_active();
+if (function_exists('session_regenerate_id')) {
+    session_regenerate_id();
+}
+
 /**
 * The cookie part. session_start and session_regenerate_session normally set
 * their own cookie. SquirrelMail sets another cookie which overwites the