From f0a7159c401983e7dbc9620582124f90f3e4eadc Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <thomas@roundcube.net>
Date: Fri, 01 Mar 2013 18:10:54 -0500
Subject: [PATCH] Add methods to append certain nodes to session data in order to avoid session saving race conditions. Fixes #1488422
---
program/lib/Roundcube/rcube_session.php | 58 +++++++++++++++++++++++++++--
program/steps/mail/attachments.inc | 16 +++----
2 files changed, 61 insertions(+), 13 deletions(-)
diff --git a/program/lib/Roundcube/rcube_session.php b/program/lib/Roundcube/rcube_session.php
index 1aa5d58..82ff8a8 100644
--- a/program/lib/Roundcube/rcube_session.php
+++ b/program/lib/Roundcube/rcube_session.php
@@ -32,6 +32,7 @@
private $ip;
private $start;
private $changed;
+ private $reloaded = false;
private $unsets = array();
private $gc_handlers = array();
private $cookiename = 'roundcube_sessauth';
@@ -200,8 +201,13 @@
if ($oldvars !== null) {
$a_oldvars = $this->unserialize($oldvars);
if (is_array($a_oldvars)) {
- foreach ((array)$this->unsets as $k)
- unset($a_oldvars[$k]);
+ // remove unset keys on oldvars
+ foreach ((array)$this->unsets as $var) {
+ $path = explode('.', $var);
+ $k = array_pop($path);
+ $node = &$this->get_node($path, $a_oldvars);
+ unset($node[$k]);
+ }
$newvars = $this->serialize(array_merge(
(array)$a_oldvars, (array)$this->unserialize($vars)));
@@ -371,9 +377,32 @@
/**
+ * Append the given value to the certain node in the session data array
+ *
+ * @param string Path denoting the session variable where to append the value
+ * @param string Key name under which to append the new value (use null for appending to an indexed list)
+ * @param mixed Value to append to the session data array
+ */
+ public function append($path, $key, $value)
+ {
+ // re-read session data from DB because it might be outdated
+ if (!$this->reloaded && microtime(true) - $this->start > 0.5) {
+ $this->reload();
+ $this->reloaded = true;
+ $this->start = microtime(true);
+ }
+
+ $node = &$this->get_node(explode('.', $path), $_SESSION);
+
+ if ($key !== null) $node[$key] = $value;
+ else $node[] = $value;
+ }
+
+
+ /**
* Unset a session variable
*
- * @param string Varibale name
+ * @param string Varibale name (can be a path denoting a certain node in the session array, e.g. compose.attachments.5)
* @return boolean True on success
*/
public function remove($var=null)
@@ -383,7 +412,11 @@
}
$this->unsets[] = $var;
- unset($_SESSION[$var]);
+
+ $path = explode('.', $var);
+ $key = array_pop($path);
+ $node = &$this->get_node($path, $_SESSION);
+ unset($node[$key]);
return true;
}
@@ -415,6 +448,23 @@
session_decode($data);
}
+ /**
+ * Returns a reference to the node in data array referenced by the given path.
+ * e.g. ['compose','attachments'] will return $_SESSION['compose']['attachments']
+ */
+ private function &get_node($path, &$data_arr)
+ {
+ $node = &$data_arr;
+ if (!empty($path)) {
+ foreach ((array)$path as $key) {
+ if (!isset($node[$key]))
+ $node[$key] = array();
+ $node = &$node[$key];
+ }
+ }
+
+ return $node;
+ }
/**
* Serialize session data
diff --git a/program/steps/mail/attachments.inc b/program/steps/mail/attachments.inc
index 180fc0b..f83f689 100644
--- a/program/steps/mail/attachments.inc
+++ b/program/steps/mail/attachments.inc
@@ -27,8 +27,10 @@
$COMPOSE_ID = get_input_value('_id', RCUBE_INPUT_GPC);
$COMPOSE = null;
-if ($COMPOSE_ID && $_SESSION['compose_data_'.$COMPOSE_ID])
- $COMPOSE =& $_SESSION['compose_data_'.$COMPOSE_ID];
+if ($COMPOSE_ID && $_SESSION['compose_data_' . $COMPOSE_ID]) {
+ $SESSION_KEY = 'compose_data_' . $COMPOSE_ID;
+ $COMPOSE =& $_SESSION[$SESSION_KEY];
+}
if (!$COMPOSE) {
die("Invalid session var!");
@@ -45,7 +47,7 @@
$attachment = $RCMAIL->plugins->exec_hook('attachment_delete', $attachment);
if ($attachment['status']) {
if (is_array($COMPOSE['attachments'][$id])) {
- unset($COMPOSE['attachments'][$id]);
+ $RCMAIL->session->remove($SESSION_KEY.'.attachments.'.$id);
$OUTPUT->command('remove_from_attachment_list', "rcmfile$id");
}
}
@@ -77,11 +79,7 @@
exit;
}
-// attachment upload action
-
-if (!is_array($COMPOSE['attachments'])) {
- $COMPOSE['attachments'] = array();
-}
+/***** attachment upload action *****/
// clear all stored output properties (like scripts and env vars)
$OUTPUT->reset();
@@ -112,7 +110,7 @@
// store new attachment in session
unset($attachment['status'], $attachment['abort']);
- $COMPOSE['attachments'][$id] = $attachment;
+ $RCMAIL->session->append($SESSION_KEY.'.attachments', $id, $attachment);
if (($icon = $COMPOSE['deleteicon']) && is_file($icon)) {
$button = html::img(array(
--
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