File roundcubemail-1.1-csrf.patch of Package roundcubemail

File roundcubemail-1.1-csrf.patch of Package roundcubemail (Revision d51b47b563271a76ca42054ce213b228)

Currently displaying revision d51b47b563271a76ca42054ce213b228 , Show latest

diff --git a/.htaccess b/.htaccess
index f21cf34..d0efd31 100644
--- a/.htaccess
+++ b/.htaccess
@@ -31,7 +31,7 @@ RewriteRule ^favicon\.ico$ skins/larry/images/favicon.ico
 # security rules:
 # - deny access to files not containing a dot or starting with a dot
 #   in all locations except installer directory
-RewriteRule ^(?!installer)(\.?[^\.]+)$ - [F]
+RewriteRule ^(?!installer|[a-f0-9]{16})(\.?[^\.]+)$ - [F]
 # - deny access to some locations
 RewriteRule ^/?(\.git|\.tx|SQL|bin|config|logs|temp|tests|program\/(include|lib|localization|steps)) - [F]
 # - deny access to some documentation files
diff --git a/config/defaults.inc.php b/config/defaults.inc.php
index 56791fb..3297dc2 100644
--- a/config/defaults.inc.php
+++ b/config/defaults.inc.php
@@ -532,6 +532,23 @@ $config['email_dns_check'] = false;
 // Note: useful when SMTP server stores sent mail in user mailbox
 $config['no_save_sent_messages'] = false;
 
+// Improve system security by using special URL with security token.
+// This can be set to a number defining token length. Default: 16.
+// Warning: This requires http server configuration. Sample:
+//    RewriteRule ^/roundcubemail/[a-f0-9]{16}/(.*) /roundcubemail/$1 [PT]
+//    Alias /roundcubemail /var/www/roundcubemail/
+// Note: Use assets_path to not prevent the browser from caching assets
+$config['use_secure_urls'] = false;
+
+// Allows to define separate server/path for image/js/css files
+// Warning: If the domain is different cross-domain access to some
+// resources need to be allowed
+// Sample:
+//    <FilesMatch ".(eot|ttf|woff)">
+//    Header set Access-Control-Allow-Origin "*"
+//    </FilesMatch>
+$config['assets_path'] = '';
+
 // ----------------------------------
 // PLUGINS
 // ----------------------------------
diff --git a/index.php b/index.php
index 3154daf..7001918 100644
--- a/index.php
+++ b/index.php
@@ -90,9 +90,9 @@ $RCMAIL->action = $startup['action'];
 
 // try to log in
 if ($RCMAIL->task == 'login' && $RCMAIL->action == 'login') {
-    $request_valid = $_SESSION['temp'] && $RCMAIL->check_request(rcube_utils::INPUT_POST, 'login');
+    $request_valid = $_SESSION['temp'] && $RCMAIL->check_request();
 
-    // purge the session in case of new login when a session already exists 
+    // purge the session in case of new login when a session already exists
     $RCMAIL->kill_session();
 
     $auth = $RCMAIL->plugins->exec_hook('authenticate', array(
@@ -140,7 +140,7 @@ if ($RCMAIL->task == 'login' && $RCMAIL->action == 'login') {
         unset($redir['abort'], $redir['_err']);
 
         // send redirect
-        $OUTPUT->redirect($redir);
+        $OUTPUT->redirect($redir, 0, true);
     }
     else {
         if (!$auth['valid']) {
@@ -171,10 +171,10 @@ if ($RCMAIL->task == 'login' && $RCMAIL->action == 'login') {
     }
 }
 
-// end session (after optional referer check)
-else if ($RCMAIL->task == 'logout' && isset($_SESSION['user_id'])
-    && (!$RCMAIL->config->get('referer_check') || rcube_utils::check_referer())
-) {
+// end session
+else if ($RCMAIL->task == 'logout' && isset($_SESSION['user_id'])) {
+    $RCMAIL->request_security_check($mode = rcube_utils::INPUT_GET);
+
     $userdata = array(
         'user' => $_SESSION['username'],
         'host' => $_SESSION['storage_host'],
@@ -234,32 +234,9 @@ if (empty($RCMAIL->user->ID)) {
 
     $OUTPUT->send($plugin['task']);
 }
-// CSRF prevention
 else {
-    // don't check for valid request tokens in these actions
-    $request_check_whitelist = array('login'=>1, 'spell'=>1, 'spell_html'=>1);
-
-    if (!$request_check_whitelist[$RCMAIL->action]) {
-        // check client X-header to verify request origin
-        if ($OUTPUT->ajax_call) {
-            if (rcube_utils::request_header('X-Roundcube-Request') != $RCMAIL->get_request_token()) {
-                header('HTTP/1.1 403 Forbidden');
-                die("Invalid Request");
-            }
-        }
-        // check request token in POST form submissions
-        else if (!empty($_POST) && !$RCMAIL->check_request()) {
-            $OUTPUT->show_message('invalidrequest', 'error');
-            $OUTPUT->send($RCMAIL->task);
-        }
-
-        // check referer if configured
-        if ($RCMAIL->config->get('referer_check') && !rcube_utils::check_referer()) {
-            raise_error(array(
-                'code' => 403, 'type' => 'php',
-                'message' => "Referer check failed"), true, true);
-        }
-    }
+    // CSRF prevention
+    $RCMAIL->request_security_check();
 
     // check access to disabled actions
     $disabled_actions = (array) $RCMAIL->config->get('disabled_actions');
diff --git a/plugins/acl/acl.js b/plugins/acl/acl.js
index e59ac72..1463453 100644
--- a/plugins/acl/acl.js
+++ b/plugins/acl/acl.js
@@ -58,8 +58,11 @@ rcube_webmail.prototype.acl_delete = function()
     var users = this.acl_get_usernames();
 
     if (users && users.length && confirm(this.get_label('acl.deleteconfirm'))) {
-        this.http_request('settings/plugin.acl', '_act=delete&_user='+urlencode(users.join(','))
-            + '&_mbox='+urlencode(this.env.mailbox),
+        this.http_post('settings/plugin.acl', {
+                _act: 'delete',
+                _user: users.join(','),
+                _mbox: this.env.mailbox
+            },
             this.set_busy(true, 'acl.deleting'));
     }
 }
@@ -67,7 +70,7 @@ rcube_webmail.prototype.acl_delete = function()
 // Save ACL data
 rcube_webmail.prototype.acl_save = function()
 {
-    var user = $('#acluser', this.acl_form).val(), rights = '', type;
+    var data, type, rights = '', user = $('#acluser', this.acl_form).val();
 
     $((this.env.acl_advanced ? '#advancedrights :checkbox' : '#simplerights :checkbox'), this.acl_form).map(function() {
         if (this.checked)
@@ -88,12 +91,18 @@ rcube_webmail.prototype.acl_save = function()
         return;
     }
 
-    this.http_request('settings/plugin.acl', '_act=save'
-        + '&_user='+urlencode(user)
-        + '&_acl=' +rights
-        + '&_mbox='+urlencode(this.env.mailbox)
-        + (this.acl_id ? '&_old='+this.acl_id : ''),
-        this.set_busy(true, 'acl.saving'));
+    data = {
+        _act: 'save',
+        _user: user,
+        _acl: rights,
+        _mbox: this.env.mailbox
+    }
+
+    if (this.acl_id) {
+        data._old = this.acl_id;
+    }
+
+    this.http_post('settings/plugin.acl', data, this.set_busy(true, 'acl.saving'));
 }
 
 // Cancel/Hide form
diff --git a/plugins/acl/acl.php b/plugins/acl/acl.php
index 33bd91e..cb1a720 100644
--- a/plugins/acl/acl.php
+++ b/plugins/acl/acl.php
@@ -452,10 +452,10 @@ class acl extends rcube_plugin
      */
     private function action_save()
     {
-        $mbox  = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_GPC, true)); // UTF7-IMAP
-        $user  = trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_GPC));
-        $acl   = trim(rcube_utils::get_input_value('_acl', rcube_utils::INPUT_GPC));
-        $oldid = trim(rcube_utils::get_input_value('_old', rcube_utils::INPUT_GPC));
+        $mbox  = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST, true)); // UTF7-IMAP
+        $user  = trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST));
+        $acl   = trim(rcube_utils::get_input_value('_acl', rcube_utils::INPUT_POST));
+        $oldid = trim(rcube_utils::get_input_value('_old', rcube_utils::INPUT_POST));
 
         $acl    = array_intersect(str_split($acl), $this->rights_supported());
         $users  = $oldid ? array($user) : explode(',', $user);
@@ -508,8 +508,8 @@ class acl extends rcube_plugin
      */
     private function action_delete()
     {
-        $mbox = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_GPC, true)); //UTF7-IMAP
-        $user = trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_GPC));
+        $mbox = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST, true)); //UTF7-IMAP
+        $user = trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST));
 
         $user = explode(',', $user);
 
diff --git a/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php b/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
index 59e116f..8fba018 100644
--- a/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
+++ b/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php
@@ -312,7 +312,7 @@ class rcube_sieve_engine
                 }
             }
             else if ($action == 'setact' && !$error) {
-                $script_name = rcube_utils::get_input_value('_set', rcube_utils::INPUT_GPC, true);
+                $script_name = rcube_utils::get_input_value('_set', rcube_utils::INPUT_POST, true);
                 $result = $this->activate_script($script_name);
                 $kep14  = $this->rc->config->get('managesieve_kolab_master');
 
@@ -326,7 +326,7 @@ class rcube_sieve_engine
                 }
             }
             else if ($action == 'deact' && !$error) {
-                $script_name = rcube_utils::get_input_value('_set', rcube_utils::INPUT_GPC, true);
+                $script_name = rcube_utils::get_input_value('_set', rcube_utils::INPUT_POST, true);
                 $result = $this->deactivate_script($script_name);
 
                 if ($result === true) {
@@ -339,7 +339,7 @@ class rcube_sieve_engine
                 }
             }
             else if ($action == 'setdel' && !$error) {
-                $script_name = rcube_utils::get_input_value('_set', rcube_utils::INPUT_GPC, true);
+                $script_name = rcube_utils::get_input_value('_set', rcube_utils::INPUT_POST, true);
                 $result = $this->remove_script($script_name);
 
                 if ($result === true) {
@@ -382,14 +382,14 @@ class rcube_sieve_engine
                 $this->rc->output->command('managesieve_updatelist', 'list', array('list' => $result));
             }
             else if ($action == 'ruleadd') {
-                $rid = rcube_utils::get_input_value('_rid', rcube_utils::INPUT_GPC);
+                $rid = rcube_utils::get_input_value('_rid', rcube_utils::INPUT_POST);
                 $id = $this->genid();
                 $content = $this->rule_div($fid, $id, false);
 
                 $this->rc->output->command('managesieve_rulefill', $content, $id, $rid);
             }
             else if ($action == 'actionadd') {
-                $aid = rcube_utils::get_input_value('_aid', rcube_utils::INPUT_GPC);
+                $aid = rcube_utils::get_input_value('_aid', rcube_utils::INPUT_POST);
                 $id = $this->genid();
                 $content = $this->action_div($fid, $id, false);
 
diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index ceb369a..fba537e 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -753,47 +753,14 @@ class rcmail extends rcube
     }
 
     /**
-     * Generate a unique token to be used in a form request
-     *
-     * @return string The request token
-     */
-    public function get_request_token()
-    {
-        $sess_id = $_COOKIE[ini_get('session.name')];
-
-        if (!$sess_id) {
-            $sess_id = session_id();
-        }
-
-        $plugin = $this->plugins->exec_hook('request_token', array(
-            'value' => md5('RT' . $this->get_user_id() . $this->config->get('des_key') . $sess_id)));
-
-        return $plugin['value'];
-    }
-
-    /**
-     * Check if the current request contains a valid token
-     *
-     * @param int Request method
-     *
-     * @return boolean True if request token is valid false if not
-     */
-    public function check_request($mode = rcube_utils::INPUT_POST)
-    {
-        $token   = rcube_utils::get_input_value('_token', $mode);
-        $sess_id = $_COOKIE[ini_get('session.name')];
-
-        return !empty($sess_id) && $token == $this->get_request_token();
-    }
-
-    /**
      * Build a valid URL to this instance of Roundcube
      *
      * @param mixed Either a string with the action or url parameters as key-value pairs
+     * @param bool  Return absolute URL to secure location
      *
      * @return string Valid application URL
      */
-    public function url($p)
+    public function url($p, $secure = false)
     {
         if (!is_array($p)) {
             if (strpos($p, 'http') === 0) {
@@ -807,8 +774,9 @@ class rcmail extends rcube
         $p['_task'] = $task;
         unset($p['task']);
 
-        $url  = './' . $this->filename;
-        $delm = '?';
+        $prefix = './';
+        $url    = $this->filename;
+        $delm   = '?';
 
         foreach (array_reverse($p) as $key => $val) {
             if ($val !== '' && $val !== null) {
@@ -818,7 +786,22 @@ class rcmail extends rcube
             }
         }
 
-        return $url;
+        // generate absolute URL if URL token exists
+        if ($secure && ($token = $this->get_secure_url_token(true))) {
+            $uri = preg_replace('/[?#&].*$/', '', $_SERVER['REQUEST_URI']);
+            if (strpos($uri, '/' . $token) === false) {
+                $uri  = rtrim($uri, '/');
+                // remove old token
+                $uri  = preg_replace('/\/[a-f0-9]{' . strlen($token) . '}$/', '', $uri);
+                // add new token
+                $uri .= '/' . $token . '/';
+
+                $prefix = (rcube_utils::https_check() ? 'https' : 'http') . '://'
+                    . $_SERVER['SERVER_NAME'] . $uri;
+            }
+        }
+
+        return $prefix . $url;
     }
 
     /**
@@ -853,6 +836,36 @@ class rcmail extends rcube
     }
 
     /**
+     * CSRF attack prevention code
+     *
+     * @param int Request mode
+     */
+    public function request_security_check($mode = rcube_utils::INPUT_POST)
+    {
+        // don't check for valid request tokens in these actions
+        // @TODO: get rid of this
+        $request_check_whitelist = array('spell'=>1, 'spell_html'=>1);
+
+        if ($request_check_whitelist[$this->action]) {
+            return;
+        }
+
+        // check request token
+        if (!$this->check_request($mode)) {
+            self::raise_error(array(
+                'code' => 403, 'type' => 'php',
+                'message' => "Request security check failed"), false, true);
+        }
+
+        // check referer if configured
+        if ($this->config->get('referer_check') && !rcube_utils::check_referer()) {
+            self::raise_error(array(
+                'code' => 403, 'type' => 'php',
+                'message' => "Referer check failed"), true, true);
+        }
+    }
+
+    /**
      * Registers action aliases for current task
      *
      * @param array $map Alias-to-filename hash array
diff --git a/program/include/rcmail_output_html.php b/program/include/rcmail_output_html.php
index a848246..2d8853f 100644
--- a/program/include/rcmail_output_html.php
+++ b/program/include/rcmail_output_html.php
@@ -45,6 +45,7 @@ class rcmail_output_html extends rcmail_output
     protected $footer = '';
     protected $body = '';
     protected $base_path = '';
+    protected $assets_path;
     protected $devel_mode = false;
 
     // deprecated names of templates used before 0.5
@@ -80,6 +81,8 @@ class rcmail_output_html extends rcmail_output
         $this->set_skin($skin);
         $this->set_env('skin', $skin);
 
+        $this->set_assets_path($this->config->get('assets_path'));
+
         if (!empty($_REQUEST['_extwin']))
             $this->set_env('extwin', 1);
         if ($this->framed || $framed)
@@ -145,6 +148,50 @@ EOF;
     }
 
     /**
+     * Parse and set assets path
+     *
+     * @param string Assets path (relative or absolute URL)
+     */
+    public function set_assets_path($path)
+    {
+        $path = rtrim($path, '/') . '/';
+
+        if (empty($path)) {
+            return;
+        }
+
+        // convert to absolute URL
+        if (!preg_match('|^https?://|', $path)) {
+            $base = preg_replace('/[?#&].*$/', '', $_SERVER['REQUEST_URI']);
+            $base = rtrim($base, '/');
+
+            // remove url token if exists
+            if ($len = intval($this->config->get('use_secure_urls'))) {
+                $_base  = explode('/', $base);
+                $length = $len > 1 ? $len : 16; // as in rcube::get_secure_url_token()
+
+                // we can't use real token here because it
+                // does not exists in unauthenticated state,
+                // hope this will not produce false-positive matches
+                foreach ($_base as $idx => $token) {
+                    if (preg_match('/^[a-f0-9]{' . $length . '}$/', $token)) {
+                        unset($_base[$idx]);
+                        break;
+                    }
+                }
+
+                $base = implode('/', $_base);
+            }
+
+            $path = (rcube_utils::https_check() ? 'https' : 'http') . '://'
+                . $_SERVER['SERVER_NAME'] . $base . '/' . $path;
+        }
+
+        $this->assets_path = $path;
+        $this->set_env('assets_path', $path);
+    }
+
+    /**
      * Getter for the current page title
      *
      * @return string The page title
@@ -367,14 +414,15 @@ EOF;
     /**
      * Redirect to a certain url
      *
-     * @param mixed $p     Either a string with the action or url parameters as key-value pairs
-     * @param int   $delay Delay in seconds
+     * @param mixed $p      Either a string with the action or url parameters as key-value pairs
+     * @param int   $delay  Delay in seconds
+     * @param bool  $secure Redirect to secure location (see rcmail::url())
      */
-    public function redirect($p = array(), $delay = 1)
+    public function redirect($p = array(), $delay = 1, $secure = false)
     {
         if ($this->env['extwin'])
             $p['extwin'] = 1;
-        $location = $this->app->url($p);
+        $location = $this->app->url($p, $secure);
         header('Location: ' . $location);
         exit;
     }
@@ -659,6 +707,24 @@ EOF;
         exit;
     }
 
+    /**
+     * Modify path by adding URL prefix if configured
+     */
+    public function asset_url($path)
+    {
+        // iframe content can't be in a different domain
+        // @TODO: check if assests are on a different domain
+        if (!$this->assets_path || $path == $this->env['blankpage']) {
+            return $path;
+        }
+
+        if ($path[0] == '.' && $path[1] == '/') {
+            $path = substr($path, 2);
+        }
+
+        return $this->assets_path . $path;
+    }
+
 
     /*****  Template parsing methods  *****/
 
@@ -715,6 +781,8 @@ EOF;
             $file = $this->file_mod($file);
         }
 
+        $file = $this->asset_url($file);
+
         return $matches[1] . '=' . $matches[2] . $file . $matches[4];
     }
 
@@ -1329,6 +1397,7 @@ EOF;
     {
         if (!preg_match('|^https?://|i', $file) && $file[0] != '/') {
             $file = $this->file_mod($this->scripts_path . $file);
+            $file = $this->asset_url($file);
         }
 
         if (!is_array($this->script_files[$position])) {
@@ -1541,7 +1610,7 @@ EOF;
         }
 
         $attrib['name'] = $attrib['id'];
-        $attrib['src'] = $attrib['src'] ? $this->abs_url($attrib['src'], true) : 'program/resources/blank.gif';
+        $attrib['src']  = $this->asset_url($attrib['src'] ? $this->abs_url($attrib['src'], true) : 'program/resources/blank.gif');
 
         // register as 'contentframe' object
         if ($is_contentframe || $attrib['contentframe']) {
@@ -1758,9 +1827,11 @@ EOF;
     {
         $images = preg_split('/[\s\t\n,]+/', $attrib['images'], -1, PREG_SPLIT_NO_EMPTY);
         $images = array_map(array($this, 'abs_url'), $images);
+        $images = array_map(array($this, 'asset_url'), $images);
 
-        if (empty($images) || $this->app->task == 'logout')
+        if (empty($images) || $_REQUEST['_task'] == 'logout') {
             return;
+        }
 
         $this->add_script('var images = ' . self::json_serialize($images) .';
             for (var i=0; i<images.length; i++) {
diff --git a/program/include/rcmail_output_json.php b/program/include/rcmail_output_json.php
index fa35824..91262ac 100644
--- a/program/include/rcmail_output_json.php
+++ b/program/include/rcmail_output_json.php
@@ -181,6 +181,11 @@ class rcmail_output_json extends rcmail_output
      */
     public function raise_error($code, $message)
     {
+        if ($code == 403) {
+            header('HTTP/1.1 403 Forbidden');
+            die("Invalid Request");
+        }
+
         $this->show_message("Application Error ($code): $message", 'error');
         $this->remote_response();
         exit;
diff --git a/program/js/app.js b/program/js/app.js
index 5a87347..0f51331 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -1404,8 +1404,10 @@ function rcube_webmail()
 
     if (task == 'mail')
       url += '&_mbox=INBOX';
-    else if (task == 'logout' && !this.env.server_error)
+    else if (task == 'logout' && !this.env.server_error) {
+      url += '&_token=' + this.env.request_token;
       this.clear_compose_data();
+    }
 
     this.redirect(url);
   };
@@ -1415,7 +1417,10 @@ function rcube_webmail()
     if (!url)
       url = this.env.comm_path;
 
-    return url.replace(/_task=[a-z0-9_-]+/i, '_task='+task);
+    if (url.match(/[?&]_task=[a-zA-Z0-9_-]+/))
+        return url.replace(/_task=[a-zA-Z0-9_-]+/, '_task=' + task);
+    else
+        return url.replace(/\?.*$/, '') + '?_task=' + task;
   };
 
   this.reload = function(delay)
diff --git a/program/js/editor.js b/program/js/editor.js
index b2e96d1..74a3134 100644
--- a/program/js/editor.js
+++ b/program/js/editor.js
@@ -36,11 +36,12 @@
 function rcube_text_editor(config, id)
 {
   var ref = this,
+    abs_url = location.href.replace(/[?#].*$/, '').replace(/\/$/, ''),
     conf = {
       selector: '#' + ($('#' + id).is('.mce_editor') ? id : 'fake-editor-id'),
       theme: 'modern',
       language: config.lang,
-      content_css: 'program/js/tinymce/roundcube/content.css?v1',
+      content_css: (rcmail.env.assets_path || '') + 'program/js/tinymce/roundcube/content.css?v1',
       menubar: false,
       statusbar: false,
       toolbar_items_size: 'small',
@@ -82,7 +83,7 @@ function rcube_text_editor(config, id)
       toolbar: 'bold italic underline | alignleft aligncenter alignright alignjustify'
         + ' | bullist numlist outdent indent ltr rtl blockquote | forecolor backcolor | fontselect fontsizeselect'
         + ' | link unlink table | emoticons charmap image media | code searchreplace undo redo',
-      spellchecker_rpc_url: '../../../../../?_task=utils&_action=spell_html&_remote=1',
+      spellchecker_rpc_url: abs_url + '/?_task=utils&_action=spell_html&_remote=1',
       spellchecker_language: rcmail.env.spell_lang,
       accessibility_focus: false,
       file_browser_callback: function(name, url, type, win) { ref.file_browser_callback(name, url, type); },
diff --git a/program/lib/Roundcube/rcube.php b/program/lib/Roundcube/rcube.php
index eedc46c..e557138 100644
--- a/program/lib/Roundcube/rcube.php
+++ b/program/lib/Roundcube/rcube.php
@@ -28,9 +28,15 @@
  */
 class rcube
 {
-    const INIT_WITH_DB = 1;
+    // Init options
+    const INIT_WITH_DB      = 1;
     const INIT_WITH_PLUGINS = 2;
 
+    // Request status
+    const REQUEST_VALID       = 0;
+    const REQUEST_ERROR_URL   = 1;
+    const REQUEST_ERROR_TOKEN = 2;
+
     /**
      * Singleton instace of rcube
      *
@@ -101,6 +107,12 @@ class rcube
      */
     public $user;
 
+    /**
+     * Request status
+     *
+     * @var int
+     */
+    public $request_status = 0;
 
     /* private/protected vars */
     protected $texts;
@@ -976,6 +988,104 @@ class rcube
 
 
     /**
+     * Returns session token for secure URLs
+     *
+     * @param bool $generate Generate token if not exists in session yet
+     *
+     * @return string|bool Token string, False when disabled
+     */
+    public function get_secure_url_token($generate = false)
+    {
+        if ($len = $this->config->get('use_secure_urls')) {
+            if (empty($_SESSION['secure_token']) && $generate) {
+                // generate x characters long token
+                $length = $len > 1 ? $len : 16;
+                $token  = openssl_random_pseudo_bytes($length / 2);
+                $token  = bin2hex($token);
+
+                $plugin = $this->plugins->exec_hook('secure_token',
+                    array('value' => $token, 'length' => $length));
+
+                $_SESSION['secure_token'] = $plugin['value'];
+            }
+
+            return $_SESSION['secure_token'];
+        }
+
+        return false;
+    }
+
+
+    /**
+     * Generate a unique token to be used in a form request
+     *
+     * @return string The request token
+     */
+    public function get_request_token()
+    {
+        $sess_id = $_COOKIE[ini_get('session.name')];
+        if (!$sess_id) {
+            $sess_id = session_id();
+        }
+
+        $plugin = $this->plugins->exec_hook('request_token', array(
+            'value' => md5('RT' . $this->get_user_id() . $this->config->get('des_key') . $sess_id)));
+
+        return $plugin['value'];
+    }
+
+
+    /**
+     * Check if the current request contains a valid token.
+     * Empty requests aren't checked until use_secure_urls is set.
+     *
+     * @param int Request method
+     *
+     * @return boolean True if request token is valid false if not
+     */
+    public function check_request($mode = rcube_utils::INPUT_POST)
+    {
+        // check secure token in URL if enabled
+        if ($token = $this->get_secure_url_token()) {
+            foreach (explode('/', preg_replace('/[?#&].*$/', '', $_SERVER['REQUEST_URI'])) as $tok) {
+                if ($tok == $token) {
+                    return true;
+                }
+            }
+
+            $this->request_status = self::REQUEST_ERROR_URL;
+
+            return false;
+        }
+
+        $sess_tok = $this->get_request_token();
+
+        // ajax requests
+        if (rcube_utils::request_header('X-Roundcube-Request') == $sess_tok) {
+            return true;
+        }
+
+        // skip empty requests
+        if (($mode == rcube_utils::INPUT_POST && empty($_POST))
+            || ($mode == rcube_utils::INPUT_GET && empty($_GET))
+        ) {
+            return true;
+        }
+
+        // default method of securing requests
+        $token   = rcube_utils::get_input_value('_token', $mode);
+        $sess_id = $_COOKIE[ini_get('session.name')];
+
+        if (empty($sess_id) || $token != $sess_tok) {
+            $this->request_status = self::REQUEST_ERROR_TOKEN;
+            return false;
+        }
+
+        return true;
+    }
+
+
+    /**
      * Build a valid URL to this instance of Roundcube
      *
      * @param mixed Either a string with the action or url parameters as key-value pairs
@@ -1263,7 +1373,7 @@ class rcube
 
         $cli = php_sapi_name() == 'cli';
 
-        if (($log || $terminate) && !$cli && $arg['message']) {
+        if ($log && !$cli && $arg['message']) {
             $arg['fatal'] = $terminate;
             self::log_bug($arg);
         }
diff --git a/program/steps/addressbook/delete.inc b/program/steps/addressbook/delete.inc
index 3d57d70..727b597 100644
--- a/program/steps/addressbook/delete.inc
+++ b/program/steps/addressbook/delete.inc
@@ -20,10 +20,11 @@
 */
 
 // process ajax requests only
-if (!$OUTPUT->ajax_call)
+if (!$OUTPUT->ajax_call) {
     return;
+}
 
-$cids   = rcmail_get_cids();
+$cids   = rcmail_get_cids(null, rcube_utils::INPUT_POST);
 $delcnt = 0;
 
 // remove previous deletes
diff --git a/program/steps/addressbook/func.inc b/program/steps/addressbook/func.inc
index 2c22d5a..84dff35 100644
--- a/program/steps/addressbook/func.inc
+++ b/program/steps/addressbook/func.inc
@@ -896,13 +896,13 @@ function rcmail_search_update($return = false)
  *
  * @return array List of contact IDs per-source
  */
-function rcmail_get_cids($filter = null)
+function rcmail_get_cids($filter = null, $request_type = rcube_utils::INPUT_GPC)
 {
     // contact ID (or comma-separated list of IDs) is provided in two
     // forms. If _source is an empty string then the ID is a string
     // containing contact ID and source name in form: <ID>-<SOURCE>
 
-    $cid    = rcube_utils::get_input_value('_cid', rcube_utils::INPUT_GPC);
+    $cid    = rcube_utils::get_input_value('_cid', $request_type);
     $source = (string) rcube_utils::get_input_value('_source', rcube_utils::INPUT_GPC);
 
     if (is_array($cid)) {
diff --git a/program/steps/utils/error.inc b/program/steps/utils/error.inc
index 2a3a9a6..b7ccf92 100644
--- a/program/steps/utils/error.inc
+++ b/program/steps/utils/error.inc
@@ -50,9 +50,17 @@ else if ($ERROR_CODE == 401) {
 
 // forbidden due to request check
 else if ($ERROR_CODE == 403) {
+    if ($_SERVER['REQUEST_METHOD'] == 'GET' && $rcmail->request_status == rcube::REQUEST_ERROR_URL) {
+        parse_str($_SERVER['QUERY_STRING'], $url);
+        $url = $rcmail->url($url, true);
+        $add = "<br /><a href=\"$url\">Click here to try again.<a/>";
+    }
+    else {
+        $add = "Please contact your server-administrator.";
+    }
+
     $__error_title = "REQUEST CHECK FAILED";
-    $__error_text  = "Access to this service was denied due to failing security checks!<br />\n"
-        . "Please contact your server-administrator.";
+    $__error_text  = "Access to this service was denied due to failing security checks!<br />\n$add";
 }
 
 // failed request (wrong step in URL)