- images.file categories.permalink old_permalinks.permalink - become binary

- session security improvement: now the sessions are valid only for originating ip addr (with mask 255.255.0.0 to allow users behind load balancing proxies) -> stealing the session cookie is almost a non issue (with the exception of the 65536 machines in range)
- metadata sync from the sync button does not overwrite valid data with empty metadata
- other small fixes/enhancements:
 - added event get_category_image_orders
 - fix display issue with redirect.tpl (h1/h2 within h1)
 - fix known_script smarty function registration
 - query search form not submitted if q is empty
 - better admin css rules
 - some other minor changes (ws_core, rest_handler, functions_search...)

git-svn-id: http://piwigo.org/svn/trunk@2521 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_session.inc.php

@@ -90,6 +90,11 @@ function pwg_session_close()
   return true;
 }
 
+function get_remote_addr_session_hash()
+{
+	return vsprintf( "%02X%02X", explode('.',$_SERVER['REMOTE_ADDR']) );
+}
+
 /**
  * this function returns
  * a string corresponding to the value of the variable save in the session
@@ -102,7 +107,7 @@ function pwg_session_read($session_id)
   $query = '
 SELECT data
   FROM '.SESSIONS_TABLE.'
-  WHERE id = \''.$session_id.'\'
+  WHERE id = \''.get_remote_addr_session_hash().$session_id.'\'
 ;';
   $result = pwg_query($query);
   if ($result)
@@ -128,7 +133,7 @@ function pwg_session_write($session_id, $data)
 UPDATE '.SESSIONS_TABLE.'
   SET expiration = now(),
   data = \''.$data.'\'
-  WHERE id = \''.$session_id.'\'
+  WHERE id = \''.get_remote_addr_session_hash().$session_id.'\'
 ;';
   pwg_query($query);
   if ( mysql_affected_rows()>0 )
@@ -138,7 +143,7 @@ UPDATE '.SESSIONS_TABLE.'
   $query = '
 INSERT INTO '.SESSIONS_TABLE.'
   (id,data,expiration)
-  VALUES(\''.$session_id.'\',\''.$data.'\',now())
+  VALUES(\''.get_remote_addr_session_hash().$session_id.'\',\''.$data.'\',now())
 ;';
   mysql_query($query);
   return true;
@@ -154,7 +159,7 @@ function pwg_session_destroy($session_id)
   $query = '
 DELETE
   FROM '.SESSIONS_TABLE.'
-  WHERE id = \''.$session_id.'\'
+  WHERE id = \''.get_remote_addr_session_hash().$session_id.'\'
 ;';
   pwg_query($query);
   return true;