From 8bed5e0151eb375e2d2dc91e4e6c6d5aa62daa5c Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Sun, 19 Jul 2015 05:06:48 -0400
Subject: [PATCH] Fix regression where compose editor mode was set incorrectly

---
 program/lib/Roundcube/rcube_session.php |  105 ++++++++++++++++++++++++++++++++++------------------
 1 files changed, 68 insertions(+), 37 deletions(-)

diff --git a/program/lib/Roundcube/rcube_session.php b/program/lib/Roundcube/rcube_session.php
index fc1d871..86316f9 100644
--- a/program/lib/Roundcube/rcube_session.php
+++ b/program/lib/Roundcube/rcube_session.php
@@ -1,6 +1,6 @@
 <?php
 
-/*
+/**
  +-----------------------------------------------------------------------+
  | This file is part of the Roundcube Webmail client                     |
  | Copyright (C) 2005-2014, The Roundcube Dev Team                       |
@@ -15,7 +15,7 @@
  +-----------------------------------------------------------------------+
  | Author: Thomas Bruederli <roundcube@gmail.com>                        |
  | Author: Aleksander Machniak <alec@alec.pl>                            |
- | Author: Cor Bosman <cor@roundcu.be>                            |
+ | Author: Cor Bosman <cor@roundcu.be>                                   |
  +-----------------------------------------------------------------------+
 */
 
@@ -29,22 +29,22 @@
  */
 abstract class rcube_session
 {
+    protected $config;
     protected $key;
     protected $ip;
     protected $changed;
     protected $start;
-    protected $time_diff = 0;
-    protected $reloaded = false;
-    protected $appends = array();
-    protected $unsets = array();
-    protected $gc_handlers = array();
-    protected $cookiename = 'roundcube_sessauth';
     protected $vars;
     protected $now;
-    protected $secret = '';
-    protected $ip_check = false;
-    protected $logging = false;
-    protected $config;
+    protected $time_diff    = 0;
+    protected $reloaded     = false;
+    protected $appends      = array();
+    protected $unsets       = array();
+    protected $gc_handlers  = array();
+    protected $cookiename   = 'roundcube_sessauth';
+    protected $secret       = '';
+    protected $ip_check     = false;
+    protected $logging      = false;
 
     /**
      * Blocks session data from being written to database.
@@ -86,9 +86,6 @@
     {
         $this->config = $config;
 
-        // register default gc handler
-        $this->register_gc_handler(array($this, 'gc'));
-
         // set secret
         $this->set_secret($this->config->get('des_key') . dirname($_SERVER['SCRIPT_NAME']));
 
@@ -119,7 +116,6 @@
         );
     }
 
-
     /**
      * Wrapper for session_start()
      */
@@ -145,12 +141,12 @@
     abstract function write($key, $vars);
     abstract function update($key, $newvars, $oldvars);
 
-
     /**
      * session write handler. This calls the implementation methods for write/update after some initial checks.
      *
      * @param $key
      * @param $vars
+     *
      * @return bool
      */
     public function sess_write($key, $vars)
@@ -171,7 +167,6 @@
             return $this->write($key, $vars);
         }
     }
-
 
     /**
      * Wrapper for session_write_close()
@@ -245,7 +240,6 @@
         $this->gc_handlers[] = $func;
     }
 
-
     /**
      * Garbage collector handler to run on script shutdown
      */
@@ -257,7 +251,6 @@
             }
         }
     }
-
 
     /**
      * Generate and set new session id
@@ -297,7 +290,6 @@
         return $cache;
     }
 
-
     /**
      * Append the given value to the certain node in the session data array
      *
@@ -331,7 +323,6 @@
             unset($this->unsets[$path]);
     }
 
-
     /**
      * Unset a session variable
      *
@@ -359,18 +350,16 @@
         return true;
     }
 
-
     /**
      * Kill this session
      */
     public function kill()
     {
         $this->vars = null;
-        $this->ip = rcube_utils::remote_addr(); // update IP (might have changed)
+        $this->ip   = rcube_utils::remote_addr(); // update IP (might have changed)
         $this->destroy(session_id());
         rcube_utils::setcookie($this->cookiename, '-del-', time() - 60);
     }
-
 
     /**
      * Re-read session data from storage backend
@@ -446,7 +435,6 @@
 
         return $data;
     }
-
 
     /**
      * Unserialize session data
@@ -546,7 +534,6 @@
         return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
     }
 
-
     /**
      * Setter for session lifetime
      */
@@ -559,7 +546,6 @@
         $this->now = $now - ($now % ($this->lifetime / 2));
     }
 
-
     /**
      * Getter for remote IP saved with this session
      */
@@ -567,7 +553,6 @@
     {
         return $this->ip;
     }
-
 
     /**
      * Setter for cookie encryption secret
@@ -577,7 +562,6 @@
         $this->secret = $secret;
     }
 
-
     /**
      * Enable/disable IP check
      */
@@ -585,7 +569,6 @@
     {
         $this->ip_check = $check;
     }
-
 
     /**
      * Setter for the cookie name used for session cookie
@@ -596,7 +579,6 @@
             $this->cookiename = $cookiename;
         }
     }
-
 
     /**
      * Check session authentication cookie
@@ -635,7 +617,6 @@
         return $result;
     }
 
-
     /**
      * Set session authentication cookie
      */
@@ -646,17 +627,67 @@
         $_COOKIE[$this->cookiename] = $this->cookie;
     }
 
-
     /**
-     * Create session cookie from session data
+     * Create session cookie from session data.
+     * The cookie will be hashed using a method defined by session.hash_function.
      *
      * @param int Time slot to use
+     *
      * @return string
      */
-    function _mkcookie($timeslot)
+    protected function _mkcookie($timeslot)
     {
         $auth_string = "$this->key,$this->secret,$timeslot";
-        return "S" . (function_exists('sha1') ? sha1($auth_string) : md5($auth_string));
+        $hash_method = (string) ini_get('session.hash_function');
+        $hash_nbits  = (int) ini_get('session.hash_bits_per_character');
+
+        if (!$hash_method) {
+            $hash_method = 'md5';
+        }
+        else if ($hash_method === '1') {
+            $hash_method = 'sha1';
+        }
+
+        if ($hash_nbits < 4 || $hash_nbits > 6) {
+            $hash_nbits = 4;
+        }
+
+        // Hash the authentication string
+        $hash = openssl_digest($auth_string, $hash_method, true);
+
+        // Above method returns "hexits". To be really compatible
+        // with session hashes generated by PHP core we'll get
+        // a raw (binary) hash and convert it to a readable form
+        // as in bin_to_readable() function in ext/session/session.c.
+        $hextab = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,-";
+        $length = strlen($hash);
+        $result = '';
+        $char   = 0;
+        $i      = 0;
+        $have   = 0;
+        $mask   = (1 << $hash_nbits) - 1;
+
+        while (true) {
+            if ($have < $hash_nbits) {
+                if ($i < $length) {
+                    $char |= ord($hash[$i++]) << $have;
+                    $have += 8;
+                }
+                else if (!$have) {
+                    break;
+                }
+                else {
+                    $have = $hash_nbits;
+                }
+            }
+
+            // consume nbits
+            $result .= $hextab[$char & $mask];
+            $char >>= $hash_nbits;
+            $have -= $hash_nbits;
+        }
+
+        return $result;
     }
 
     /**

--
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